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Song, Gangfu
- Adsorptive Removal of Methylene Blue by Mn-Modified Tourmaline
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Authors
Affiliations
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
Source
Nature Environment and Pollution Technology, Vol 17, No 1 (2018), Pagination: 243-247Abstract
Adsorbent Mn-modified tourmaline was creatively prepared by wet impregnation in a MnSO4 solution and subsequent calcination procedure. The prepared Mn-modified tourmaline was used for the adsorptive removal of a cationic dye methylene blue (MB). The experimental data under different solution pH conditions were simulated using both linear and non-linear kinetic models. Linear pseudo-secondorder model and non-linear Elovich kinetic model were found to be more suitable to describe the adsorption kinetics. This indicates that the adsorption of MB onto the Mn-modified tourmaline is possibly a chemisorption process in which the rate-determining step is diffusion in nature. The adsorption isotherms were also investigated and the experimental data were fitted by both Langmuir and Freundlich models. Usinxg Langmuir model, the calculated maximal adsorption capacities for MB achieved 158.5 mg/g at 298 K. Thermodynamic analysis indicates that the changes of enthalpy and entropy of the adsorption processes are 55.6 KJ mol-1 and 199.0 J mol-1 k-1, respectively. The negative value of Gibbs free energy change and the positive value of enthalpy also indicates that the adsorption process is spontaneous and endothermic.Keywords
Mn-Modified Tourmaline, Methylene Blue, Adsorption Kinetics, Isotherm.Full Text
References
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- Adsorption Isotherm Performance of Zr-Mn Binary Oxide for Efficient Removal of Antibiotics Tetracycline
Abstract Views :372 |
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Authors
Affiliations
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
Source
Nature Environment and Pollution Technology, Vol 17, No 2 (2018), Pagination: 631-635Abstract
Zr-Mn binary oxide was prepared by a simple co-precipitation method, in which Mn(II) was tentatively used to prepare a precursor solution. Then the prepared Zr-Mn binary oxide was used for the adsorptive removal of tetracycline (TC). Effect of molar ratio of Zr/Mn, adsorbent dose and solution pH was investigated. The Zr-Mn binary oxide with a presumed molar ratio of Zr/Mn at 2:1 had a better adsorption performance. The removal efficiency of TC (15 mg/L) at a dose of 10 mg achieved as much as 97.4%, which demonstrated an excellent adsorption capability of Zr-Mn binary oxide. Acidic and near-neutral solution pH conditions were favourable for the uptake of TC. Freundlich model described the adsorption isotherm better than Langmuir model, indicating a heterogeneous surface of the prepared adsorbent. Using Langmuir model, the calculated maximal adsorption capacities for TC achieved 129.5 mg/g at 298 K. Thermodynamic analysis indicated that the changes of enthalpy and entropy of the adsorption processes were 206.32 KJ mol-1 and 752.0 J mol-1 k-1, respectively. The negative value of Gibbs free energy change and the positive value of enthalpy also indicated that the adsorption process is spontaneous and endothermic.Keywords
Zr-Mn Binary Oxide, Tetracycline, Adsorption, Isotherm.Full Text
References
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