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Co-Authors
- Kiros Guesh
- Abi Taddesse
- Hailemariam Gebru
- Jyotsna Kaushal
- Rajan B. Jain
- M. Rahman
- S. Thippeswamy
- S. Fahmi
- D. K. Sharma
- Govind Singh
- Ashok Kumar
- K. Anand
- Cherinet Bekele
- Archana Bachheti
- Marshet Getaye
- D. V. S. Jain
- I. Bhattacharjee
- M. Agarwal
- M. K. Roy
- V. P. Saxena
- P. K. Panchal
- T. S. Miglani
- T. B. Babu
- P. K. Shrivastava
- A. K. Pande
- K. R. Gupta
- B. Venkateswaran
- I. H, Israili
- A. Yugandhara Rao
- K. Vijay Raj
- L. K. Nanda
- A. K. Rai
- P. S. Parihar
- Gaim Gebrezgiabhiar
- Mamta Yadav
- Jemal Mohammed Yasin
- Abi M. Taddesse
- Sarita Yadav
- D. K. Tyagi
- Ram Partap
- Neelam Swaroop
- V. K. Garg
- Y. K. Yadav
- Eleni Daoutsali
- D. V. Singh
- B. S. Dhillon
- T. Mohapatra
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Yadav, O. P.
- Effect of Ag-N Co-Doping in Nanosize TiO2 on Photocatalytic Degradation of Methyl Orange Dye
Abstract Views :204 |
PDF Views:11
Authors
Affiliations
1 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, ET
1 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, ET
Source
Journal of Surface Science and Technology, Vol 29, No 3-4 (2013), Pagination:Abstract
Synergetically modified nanosize TiO2 semiconductor heterogeneous photocatalyst powder has been synthesized from TiCl4 precursor for producing efficient photocatalyst that may work under visible radiation. The crystallite phase and size of the as-synthesized photo-catalyst were determined by X-ray diffraction (XRD) technique. As-synthesized TiO2 was found to be nano-crystalline anatase. The absorption edge of the photo-catalyst was evaluated from the UV/ Visible diffuse absorbance spectra. The band gap energies (Ebg) of undoped-, Ag-doped-, Ndoped- and Ag-N co-doped TiO2 semiconductor photo-catalysts were found to be 3.14, 3.02, 2.56 and 2.45 eV, respectively. Co-doping of Ag and N in TiO2 has shown synergetic effect towards photo-catalytic degradation of methyl orange in aqueous solutions. Using Ag-N co-doped TiO2 photo-catalyst, degradation of methyl orange under UV and visible irradiations were 79.1% and 73.5%, respectively.Keywords
Absorbance, Degradation, Diffraction, Nanoparticles, Photo-Catalyst.
- Green Synthesis of Silver Nanoparticles and their Antibacterial Activity
Abstract Views :196 |
PDF Views:2
Authors
Affiliations
1 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, ET
2 School of Applied Science, Chitkara University, Punjab, IN
3 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, IN
1 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, ET
2 School of Applied Science, Chitkara University, Punjab, IN
3 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, IN
Source
Journal of Surface Science and Technology, Vol 29, No 1-2 (2013), Pagination: 47-66Abstract
Silver nanoparticles have been prepared by the reduction of silver ions using respectively castor oil (ricinus communis), khat (catha edulis) and sun flower (helianthus annuus) leaf extracts as reducing and stabilizing agents. The as-synthesized material was characterized by using spectroscopic, XRD and TEM techniques. As-synthesized silver nanoparticles are found to have face centered cubic structure with average crystallite size 28 nm. and showed antimicrobial activity against Escherichia coli and Staphylococcus aureus.Keywords
Ag-Nanoparticles, Synthesis, Green Reducing Agents, Antimicrobial Activity.- Petrography and Geochemistry of the Radioactive Albitites and their Genesis: Maonda Area, North Rajasthan
Abstract Views :185 |
PDF Views:3
Authors
Rajan B. Jain
1,
O. P. Yadav
1,
M. Rahman
1,
S. Thippeswamy
2,
S. Fahmi
1,
D. K. Sharma
1,
Govind Singh
1
Affiliations
1 Atomic Minerals Division, J.L.N. Marg, Uniara Garden, Jaipur - 302 004, IN
2 Atomic Minerals Division, Nagarabhavi, Bangalore, IN
1 Atomic Minerals Division, J.L.N. Marg, Uniara Garden, Jaipur - 302 004, IN
2 Atomic Minerals Division, Nagarabhavi, Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 53, No 4 (1999), Pagination: 407-415Abstract
A partly concealed radioactive alibitized pegmatoid/quartz albitite body (1200 m x 0.5 to 20 m) containing 0.010 to 0.190% U3O8 and 0.007 to 0.076% ThO2 and about 20 brick red coloured albitite lenses varying in dimension from 13 m x 7 m to 220 m x 12-30 m and containing 0.022 to 3.50% U3O8 and 2 are described at Banjaron Ki Dhani, new Maonda in north Rajasthan. Davidite, brannerite, rutile, anatase, zircon, monazite and traces of uraninite have been identified in the albitites. A metasomatic origin for the albitites is suggested. The distribution of albitites along NE-SW to NW-SE and E-W trending weak structural planes and the coincidence of 'Albitite Line' with Kaliguman lineament, demonstrates the tectonic control of albitization.Keywords
Geochemistry, Albitite, Soda Metasomatism, Radioactivity, Rajasthan.- Effect of Formamide on the Surface and Thermodynamic Properties of some Surfactant Solutions
Abstract Views :168 |
PDF Views:2
Authors
Affiliations
1 Department of Chemistry and Physics, CCS Haryana Agricultural University, Hisar-125 004, IN
1 Department of Chemistry and Physics, CCS Haryana Agricultural University, Hisar-125 004, IN
Source
Journal of Surface Science and Technology, Vol 15, No 1-2 (1999), Pagination: 58-68Abstract
From the measured surface tension data, surface properties and thermodynamic quantities of micellization, adsorption at the air-liquid interface and transfer from water to mixed solvent (formamide + water) have been determined for the systems : (1) Sodium Dodecyl Sulphate + Formamide + Water; (2) Dodecyl Trimethyl Ammonium Bromide + Formamide + Water and (3) Triton X-100 + Formamide + Water. The process of micellization in the bulk solution and the adsorption of surfactants at the air-liquid interface are favoured by the enthalpy as well as the entropy effects. The results have been descirbed in terms of the intermolecular interaction of the components in the solutions.Keywords
Micellization, Adsorption, Mixed Solvents, Thermodynamics of the Processes, Intermolecular Interaction.- Cyclic Voltammetric Determination of Acetylsalicylic Acid (Aspirin) at Polyaniline (PANI) Modified Glassy Carbon Electrode
Abstract Views :199 |
PDF Views:2
Authors
Affiliations
1 Chemistry Department, Haramaya University, Post Box : 138, Dire Dawa, ET
2 Biology Department, Haramaya University, Post Box : 138, Dire Dawa, ET
1 Chemistry Department, Haramaya University, Post Box : 138, Dire Dawa, ET
2 Biology Department, Haramaya University, Post Box : 138, Dire Dawa, ET
Source
Journal of Surface Science and Technology, Vol 30, No 3-4 (2014), Pagination: 149-161Abstract
Polyaniline (PANI)-modified glassy carbon electrode has been synthesized by electropolymerizing aniline for determining acetylsalicylic acid (ASA in pharmaceutical samples using cyclic and differential pulse voltammetric techniques. The best performance of the PANI modified glassy carbon electrode in 0.04 M Britton Robinson buffer was obtained at pH 2.0. Under these conditions single oxidation peak at a potential of 250 mV vs Ag/AgCl/sat'd KCl, characteristic of an irreversible reaction, was observed. Studies on the effects of pH, scan rate and substrate concentration revealed irreversible diffusion controlled electrode redox reaction. The PANI modified glassy carbon electrode showed higher electro-catalytic efficiency, compared to the unmodified one, for ASA determination.Keywords
Aspirin, Electro-Catalytic Efficiency, Pharmaceutical, Polyaniline, Voltammetry.- Effect on Photo-Catalytic Activity of Zinc Oxide Nanoparticles upon Doping with Silver and Sulphur in Degradation Reaction of Malachite Green
Abstract Views :289 |
PDF Views:2
Authors
Affiliations
1 Department of Chemistry, College of Natural and Computational Science, Haramaya University, Dire Dawa, ET
2 Chemistry Department, Panjab University, Chandigarh - 160014, Panjab, IN
1 Department of Chemistry, College of Natural and Computational Science, Haramaya University, Dire Dawa, ET
2 Chemistry Department, Panjab University, Chandigarh - 160014, Panjab, IN
Source
Journal of Surface Science and Technology, Vol 31, No 1-2 (2015), Pagination: 69-76Abstract
Zinc Oxide nanoparticles and their corresponding sulphur, silver and silver (silver + sulphur) doped variants have been prepared by mechano-chemical synthesis. These have been used as photocatalysts and were characterized by XRD, TEM, FTIR and UV-Visible spectroscopic techniques. Photocatalytic degradation of malachite green (MG) dye over these photocatalysts was studied under visible as well as UV radiations. The (Ag, S) co-doped ZnO exhibited the highest photocatalytic efficiency both under UV as well as visible radiations. It is observed that doping of Ag and S in ZnO had synergetic effect in improving its photo-catalytic activity. Photocatalytic degradation of Malachite Green (MG) dye is found to follow a pseudo first order kinetics.Keywords
Degradation, Mechano-Chemical, Nanoparticles, Photocatalyst, XRDReferences
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- E. Alemseged, O. P. Yadav and R. K Bachheti. 5, 1452(2013).
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- A Note on the Phosphatic Tuffaceous Shale Hosted Uranium Mineralisation in Semri Group of Sediments around Mankisar-Kathar Area, Sidhi District, Madhya Pradesh
Abstract Views :196 |
PDF Views:2
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Nagpur - 440 001, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad - 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Nagpur - 440 001, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 2 (2008), Pagination: 215-218Abstract
The paper reports for the first time uranium mineralisation associated with phosphatic tuffaceous shale of the Lower Vindhyan Semri Group, near the southern margin of Son Valley around Mankisar-Karaundiya-Kathar area. Grab samples from this rock unit analyzed upto 900 ppm of U3O8 and upto 18.5 % of P2O5. Uranium enrichment in tuffaceous shale has been inferred due to hydrothermal activity.Keywords
Uranium Mineralization, Semri Group, Sidhi District, Madhya Pradesh.- A Note on the Geology and Geochemistry of Radioactive Palaeosol on Basement Granites of Aravalli Supergroup, Chittorgarh District, Rajasthan
Abstract Views :171 |
PDF Views:168
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Jaipur - 303 906,, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad - 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Jaipur - 303 906,, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 63, No 5 (2004), Pagination: 551-554Abstract
No Abstract.Full Text
- Note on the first Report of Quaternary Sedimentation and its Significance in West Jahajpur Basin, Bhilwara District, Rajasthan
Abstract Views :184 |
PDF Views:147
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Western Region, Jaipur - 302 004, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Western Region, Jaipur - 302 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 6 (2001), Pagination: 539-542Abstract
Quaternary sequences of mud/silt with carbonaceous matter and coaly layers, sandstone and conglomerate is found in the structural depressions near Jahajpur basin in Rajasthan. Uranium is also found in these sediments which may have been derived from the basement of Berach Granite and phyllites of Jahajpur Group.Full Text
- A Note on the Uranium Occurrences and Probable Controls for Mineralisation in Upper Gondwana Sequence of Kharatoria Area, Chhindwara District, Madhya Pradesh
Abstract Views :165 |
PDF Views:2
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Nagpur- 440 001, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad - 500 0 16, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Nagpur- 440 001, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad - 500 0 16, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 6 (2006), Pagination: 959-962Abstract
Significant uranium mineralisation associated with subfeldspathic arenite of Lower Denwa Formation (Mid Triassic) has been located at Kharatoria, dist Chhindwara, M P in Satpura Gondwana Basin. Grab samples collected from the radioactive horizon analysed up to 0 1%U3O8, with <0 005%ThO2. Besides, a spring sediment sample collected from the same locality indicated anomalous concentration of U, Zn, Pb and Ce and Th. Preliminary studies revealed the possibility of sedimentary facies/Hydrothermal control of uranium mineralisation and probable presence of organic/Inorganic carbon induced reducing environment in the area.Keywords
Uranium, Upper Gondwana, Genetic Controls, Kharatoria, Chhindwara District, Madhya Pradesh.- Uranium-Bearing Magnesian-Calcrete in Surficial Environment from Khemasar, Churu District, Rajasthan, India
Abstract Views :209 |
PDF Views:88
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Vishakapatnam 530 007, IN
2 Atomic Minerals Directorate for Exploration and Research, Jaipur 302 033, IN
3 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, Vishakapatnam 530 007, IN
2 Atomic Minerals Directorate for Exploration and Research, Jaipur 302 033, IN
3 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, IN
Source
Current Science, Vol 108, No 8 (2015), Pagination: 1540-1544Abstract
Magnesium-bearing calcretes of soft-gritty and hard pan varieties containing uranium concentrations from 16 to 74 ppm with <10 ppm of thorium are located along the Saraswati palaeochannel at Khemasar village, Churu district, Rajasthan. The uraniumbearing calcretes are exposed over an areal extent of 300 m × 200 m with thickness of up to 2 m in an interdunal depression. The silty sand layer occurring below the calcrete horizon suggests that it is a valley-fill calcrete, deposited along a palaeochannel. This occurrence of uraniferous Mg-calcrete in the Saraswati river palaeochannel opens up a large area for uranium exploration in the calcrete environment of Thar Desert. These calcretes are composed of 15.94% to 25.39% CaO, 7.15% to 22.39% MgO and Sr/Ba ratio up to 66.98. There is a positive correlation of U with Sr/Ba and MgO. The high Sr/Ba ratio and MgO indicate water of saline nature and high rate of evaporation. Ephemeral centripetal drainage mixing with the dissected palaeochannel waters and groundwaters, under arid climatic conditions might have resulted in the formation of this kind of uranium-bearing calcrete in fluvio-lacustrine environment.Keywords
Fluvio-Lacustrine Environment, Khemasar, Magnesian Calcrete, Surficial Type Uranium.Full Text
- Photo-catalytic Degradation of Methyl Orange Dye using ZnS and N-doped ZnS Nanoparticles under Visible Radiation
Abstract Views :181 |
PDF Views:2
Authors
Affiliations
1 Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, ET
2 Chemistry Department, HNB Garhwal Central University, Srinagar, Uttarakhand, IN
3 Chemistry Department, Panjab University, Chandigarh - 160014, IN
1 Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, ET
2 Chemistry Department, HNB Garhwal Central University, Srinagar, Uttarakhand, IN
3 Chemistry Department, Panjab University, Chandigarh - 160014, IN
Source
Journal of Surface Science and Technology, Vol 31, No 3-4 (2015), Pagination: 184-189Abstract
ZnS and N-doped-ZnS nanoparticles were prepared by aqueous chemical method under optimal conditions and characterized using XRD, TEM and UV-Visible spectroscopic techniques. As-synthesized nanomaterials were used as a photo-catalysts for the degradation of Methyl Orange (MO) dye. Effects of photo-catalyst load, pH, and substrate initial concentration on degradation of the dye in aqueous solution have been investigated. Maximum degradation (76.56 %) of methyl orange was observed using optimum pH 6 and catalyst load 250 mgL-1.Keywords
Methyl Orange, Photo Catalysis, Nanoparticles, Rate of Degradation, XRD TEM.References
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- Photo-Catalytic Activity of Ag-N Co-Doped ZnO/CuO Nanocomposite for Degradation of Methyl Orange
Abstract Views :237 |
PDF Views:2
Authors
Affiliations
1 Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, ET
1 Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, ET
Source
Journal of Surface Science and Technology, Vol 32, No 1-2 (2016), Pagination: 49-57Abstract
Nano-size Ag-N co-doped ZnO-CuO composites have been synthesized and tested for their photo-catalytic activity towards degradation of methyl orange in aqueous solution under visible as well as UV radiations. Crystal structure, surface functional groups, metallic composition and band structure of as-synthesized nano-material were investigated using XRD, FTIR, AAS and UV-Vis spectroscopic techniques, respectively. Ag-N co-doped ZnO-CuO photocatalyst showed higher photo-catalytic activity than Ag- or N-doped and undoped composite photocatalysts. The observed highest activity of Ag-N co-doped ZnO-CuO among the studied photo-catalysts, is attributed to the cumulative effects of lowering of band-gap energy and decrease of recombination rate of photo-generated electrons and holes owing to doped N and Ag, respectively. Effects of photo-catalyst load, solution pH and substrate initial concentration on the degradation of methyl orange have also been studied.Keywords
Band-Gap, Degradation, Nanocomposite, Photocatalysts, Rate Constant, Spectroscopy.References
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- Equilibrium and Kinetic Studies on Adsorption of Congo-Red Dye from Aqueous Solution onto Rice Husk Carbon
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Authors
Affiliations
1 Department of Chemistry, D.A.V. Post Graduate College, Dehradun-248 001, Uttrakhand, IN
2 Department of Chemistry, C. C. S. Haryana Agricultural University, Hisar-125 001, Haryana, IN
1 Department of Chemistry, D.A.V. Post Graduate College, Dehradun-248 001, Uttrakhand, IN
2 Department of Chemistry, C. C. S. Haryana Agricultural University, Hisar-125 001, Haryana, IN
Source
Nature Environment and Pollution Technology, Vol 10, No 4 (2011), Pagination: 551-558Abstract
Equilibrium and kinetic data for the adsorption of Congo-red dye from aqueous solution onto activated rice husk carbon have been reported. The effects of dye initial concentration, adsorbent-adsorbate contact time, temperature, adsorbent's amount and particle size on the percent adsorption of the dye on the adsorbent have been investigated. Kinetics of adsorption of Congo-red onto the adsorbent in aqueous solution was monitored spectrophotometrically. At the specified dye initial concentration, percent adsorption of dye increases with increase in temperature as well as the adsorbate-adsorbent contact period. However, at the given temperature, % adsorption of Congo-red decreases with the increase in dye initial concentration. The observed adsorption data were analysed in light of Langmuir and Freundlich adsorption isotherms. Dye adsorption rate constant (kad) follows the first order kinetics. Activation energy (Ea) of adsorption, intra-particle diffusion rate constant and thermodynamic parameters of Congo-red adsorption on the rice-husk carbon have been evaluated and interpreted.Keywords
Congo-Red Dye, Rice Husk Carbon, Equilibrium, Kinetics of Adsorption.Full Text
- An Overview of Effluent Treatment for the Removal of Pollutant Dyes
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Authors
Affiliations
1 Department of Chemistry, D.A.V.P.G. College, Dehradun- 248001, Uttrakhand, IN
2 Chemistry Department, CCS Haryana Agricultural University, Hisar-125001, IN
1 Department of Chemistry, D.A.V.P.G. College, Dehradun- 248001, Uttrakhand, IN
2 Chemistry Department, CCS Haryana Agricultural University, Hisar-125001, IN
Source
Asian Journal of Research in Chemistry, Vol 5, No 1 (2012), Pagination: 1-7Abstract
Wastewater effluents from textile, paper, tannery and beverage industries are contaminated with variety of pollutants including dyes. Dyes are skin irritant, carcinogenic and can cause allergic dermatitis and mutation. Environmental legislations are now becoming more stringent to control the release of dyes into the environment. Biological treatment of effluent requires a large land area and is constrained by toxicity of some chemicals, and less flexibility in design and operation. Chemical treatments for the removal of dyes from the polluted effluents are not cost effective. Photocatalytic dye degradation techniques suffer from their low efficiency. Adsorption method has been found to be efficient, economical, renewable and eco-friendly solution in treating effluents contaminated with dyes. An overview of the treatments of dye contaminated effluents by biological, chemical and physical methods have been presented.Keywords
Adsorption, Biological, Chemical, Dyes, Industrial Effluents, Pollutants.- Surface and Thermodynamic Properties of Cetyl Pyridinium Chloride (CPC) in Aqueous Sodium Chloride Solutions at Various Temperatures
Abstract Views :179 |
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Authors
Affiliations
1 Department of Chemistry, Government College, Hisar, 125001, IN
2 Jain P.G. College, Mujaffar Nagar (U.P.), 251001, IN
3 Department of Chemistry, D A V College, Dehradun, IN
4 Department of Chemistry, CCS Haryana Agricultural University, Hisar 125 004, IN
1 Department of Chemistry, Government College, Hisar, 125001, IN
2 Jain P.G. College, Mujaffar Nagar (U.P.), 251001, IN
3 Department of Chemistry, D A V College, Dehradun, IN
4 Department of Chemistry, CCS Haryana Agricultural University, Hisar 125 004, IN
Source
Asian Journal of Research in Chemistry, Vol 5, No 1 (2012), Pagination: 34-37Abstract
Critical micelle concentration (CMC), maximum surface excess concentration (Γmax), minimum area per molecule (Amin) at air-liquid interface of cetyl pyridinium chloride (CPC) in aqueous sodium chloride solutions have been, tensiometrically, determined at 288.15, 293.15 and 298.15 K. Thermodynamic parameters of micellization as well as of adsorption at air-liquid interface have been evaluated. Whereas micellization process is exothermic, adsorption of surfactant at the air-liquid interface is endothermic in nature. The latter process however becomes feasible owing to the predominant entropy gain.
Keywords
Critical Micelle Concentration, Tensiometrically, Micellization, Adsorption, Entropy.- The Kinetic and Equilibrium Studies on Adsorption of Rhodamine-B Dye From Aqueous Solution onto Rice Husk Carbon
Abstract Views :206 |
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Authors
Affiliations
1 Department of Chemistry, D.A.V.P.G. College, Dehradun- 248001, Uttrakhand, IN
2 Chemistry Department, CCS Haryana Agricultural University, Hisar-125001, IN
1 Department of Chemistry, D.A.V.P.G. College, Dehradun- 248001, Uttrakhand, IN
2 Chemistry Department, CCS Haryana Agricultural University, Hisar-125001, IN
Source
Asian Journal of Research in Chemistry, Vol 4, No 6 (2011), Pagination: 917-924Abstract
Kinetic and equilibrium studies for the adsorption of Rhodamine-B dye from aqueous solution onto activated rice husk carbon have been reported. The effect of parameters such as: contact time, dye initial concentration, temperature, adsorbent's amount and particle size on the color removing efficiency of the activated rice husk carbon has been investigated. Kinetics of adsorption of dye at adsorbent in aqueous solution was monitored spectrophotometrically. At the given initial dye concentration, its percent adsorption increases with increase in temperature as well as the adsorbate-adsorbent contact period and the equilibrium was established after 120 minutes. However, at the given temperature, % adsorption of the dye decreases with the increase in its initial concentration. The curves representing adsorption isotherms are single and continuous leading to saturation, suggesting monolayer coverage of the dye on the adsorbent surface. The observed adsorption data was analysed in the light of Langmuir and Freundlich adsorption isotherms. Dye adsorption rate constant (kad) follows the first order kinetics. Activation energy (Ea), intra-particle diffusion rate constant and thermodynamic quantities of dye adsorption on the rice-husk carbon have been evaluated and interpreted.Keywords
Equilibrium, Rhodamine-B, Adsorption, Activation Energy, Thermodynamic.- Study on Catalytic Oxidation of Carbonmonoxide over Nano-Size Platinum + Alumina Composite
Abstract Views :164 |
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Authors
Affiliations
1 Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar-125001, IN
2 Department of Agricultural Processing and Energy, Haryana Agricultural University, Hisar-125001, IN
3 Institut fur Didaktik der Chemie, Fliednerstr, 21; 48149 Münster, DE
1 Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar-125001, IN
2 Department of Agricultural Processing and Energy, Haryana Agricultural University, Hisar-125001, IN
3 Institut fur Didaktik der Chemie, Fliednerstr, 21; 48149 Münster, DE
Source
Asian Journal of Research in Chemistry, Vol 4, No 6 (2011), Pagination: 1005-1008Abstract
Nano-size platinum particles were synthesized by chemical reduction of Pt+4 ions in water-in-oil microemulsion. As synthesized platinum nanoparticles have been characterized using TEM and XRD techniques. Platinum (2%)+Alumina composite was used as a catalyst for carrying out the oxidation of CO to CO2, over 50-500°C, in a suitably designed converter comprising a vertical quartz tube connected to a quadrupole mass spectrometer. Effects of [Water]/[Surfactant] ratio and the presence of polyethylene glycol (PEG) in the microemulsion on the size and catalytic efficiency of as-synthesized platinum nanoparticles have been investigated. The size of platinum nanoparticles grows further on increasing [Water]/[Surfactant] ratio in the microemulsion composition. Whereas, using pure alumina as catalyst, conversion of CO to CO2 occurs at 3000C, such conversion occurs at much lower temperature (225°C) using alumina+Pt (2%) as catalyst. CO to CO2 conversion temperature is further lowered to 200°C when the platinum nanoparticles synthesized in microemulsion, stabilized by polyethylene glycol (PEG), are used in the above composite catalyst.Keywords
Platinum, Microemulsion, Polymer, Nanoparticles, Catalyst, Mass Spectrometer, Alumina, Poly(Ethylene Glycol).- India’s Evergreen Revolution in Cereals
Abstract Views :245 |
PDF Views:76
Authors
Affiliations
1 ICAR-Central Arid Zone Research Institute, Jodhpur 342 003, IN
2 Punjab Agricultural University, Ludhiana 141 004, IN
3 Indian Council of Agricultural Research, New Delhi 110 014, IN
1 ICAR-Central Arid Zone Research Institute, Jodhpur 342 003, IN
2 Punjab Agricultural University, Ludhiana 141 004, IN
3 Indian Council of Agricultural Research, New Delhi 110 014, IN
Source
Current Science, Vol 116, No 11 (2019), Pagination: 1805-1808Abstract
The term ‘Green Revolution’ (GR) is used to highlight an unprecedented increase in wheat production in India during 1968–72. The critics of GR allege that there is technology fatigue, especially after 1980s. The present study was undertaken to analyse the trends in productivity of major cereals and compare yield gains during the GR era and post-GR era. The period of 68 years since 1950 was divided in four phases: pre-GR era (1950–66) referred to as phase I, GR era (1967–83) as phase II, post-GR era of 1984–2000 as phase III and post-GR era of 2001–17 as phase IV. The annual rate of gain in productivity (kg/ha/yr) in each phase was estimated by linear regression. The annual gain in wheat productivity in phase III (53.1 kg/ha) was 30% higher than that in the GR era (41.0 kg/ha). In rice, the productivity gains increased consistently: annual gain in phase III (32.3 kg/ha) and phase IV (41.6 kg/ha) was 68% to 117% respectively, higher than that in the GR era (19.2 kg/ha). The rate of gain in productivity of maize and pearl millet in phases III and IV was 188–530% higher in comparison to the GR phase. The progress can largely be attributed to development and adoption of improved cultivars with higher yield potential and crop management technologies. The analysis provided conclusive evidence of India experiencing evergreen revolution in major cereals.Keywords
Cereals, Crop Productivity, Green Revolution, Improved Cultivars.Full Text
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