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Green Synthesis, Characterization and Applications of TiO2 Nanoparticles using Aqueous Extract of Erythrina Variegata Leaves


Affiliations
1 PG & Research Department of Chemistry, The Standard Fireworks Rajaratnam College for Women, Sivakasi 626 123, India
2 PG & Research Department of Chemistry, Virudhunagar Hindu Nadar’s Senthikumara Nadar (VHNSN) College, Virudhunagar 626 001, India
3 Mepco School of Management Studies, Mepco Schlenk Engineering College (Autonomous), Sivakasi 626 001, India
 

Green synthesis is a simple, non-toxic, economical and eco-friendly approach for the synthesis of nanoparticles (NPs). The implementation of new technologies has led to the new area of nano revolution which unfolds the role of plants in bio- and green synthesis of nanomate­rials. The plant extracts employed are neem, lemon grass, aloe vera, Indian gooseberry, etc., focusing on the green chemistry principles. In the present work, NPs of titanium dioxide (TiO<sub>2</sub>) were synthesized using an aqueous extract of Erythrina variegata leaves as a capping agent. The leaf extract was utilized as a reducing agent for the conversion of metal precursors into metal-oxide NPs. E. variegata-mediated TiO<sub>2</sub> NPs were characterized by UV–Vis absorption spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction (XRD), energy-dispersive X-ray spectro­scopy and morphological studies were conducted by scanning electron microscopy. The UV–Vis absorption spectrum showed an absorption band at 317.6 nm, which supports the formation of TiO2 NPs. The optical band-gap energy was determined to be 2.35 eV. Further characterization by XRD supported the crystallinity and purity of the synthesized TiO<sub>2</sub> NPs. These NPs may have effective dye degradation ability. The green-synthesized TiO<sub>2</sub> NPs exhibited interesting photo­catalytic efficacy on methylene blue dye under UV irradiation (using a multi-lamp photo reactor) and anti­bacterial activity against pathogenic organisms like Streptococcus, Staphylococcus, Escherichia coli and Pseudomonas aeruginosa.

Keywords

Antibacterial Activity, Erythrina Variegata, Green Synthesis, Nanoparticles, Photocatalytic Efficacy, Titanium Dioxide
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  • Green Synthesis, Characterization and Applications of TiO2 Nanoparticles using Aqueous Extract of Erythrina Variegata Leaves

Abstract Views: 282  |  PDF Views: 150

Authors

Jayaram Mari Selvi
PG & Research Department of Chemistry, The Standard Fireworks Rajaratnam College for Women, Sivakasi 626 123, India
Mariappan Murugalakshmi
PG & Research Department of Chemistry, The Standard Fireworks Rajaratnam College for Women, Sivakasi 626 123, India
Ponnusamy Sami
PG & Research Department of Chemistry, Virudhunagar Hindu Nadar’s Senthikumara Nadar (VHNSN) College, Virudhunagar 626 001, India
Mariappan Gnanaprakash
Mepco School of Management Studies, Mepco Schlenk Engineering College (Autonomous), Sivakasi 626 001, India
R. Thanalakshmi
PG & Research Department of Chemistry, The Standard Fireworks Rajaratnam College for Women, Sivakasi 626 123, India

Abstract


Green synthesis is a simple, non-toxic, economical and eco-friendly approach for the synthesis of nanoparticles (NPs). The implementation of new technologies has led to the new area of nano revolution which unfolds the role of plants in bio- and green synthesis of nanomate­rials. The plant extracts employed are neem, lemon grass, aloe vera, Indian gooseberry, etc., focusing on the green chemistry principles. In the present work, NPs of titanium dioxide (TiO<sub>2</sub>) were synthesized using an aqueous extract of Erythrina variegata leaves as a capping agent. The leaf extract was utilized as a reducing agent for the conversion of metal precursors into metal-oxide NPs. E. variegata-mediated TiO<sub>2</sub> NPs were characterized by UV–Vis absorption spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction (XRD), energy-dispersive X-ray spectro­scopy and morphological studies were conducted by scanning electron microscopy. The UV–Vis absorption spectrum showed an absorption band at 317.6 nm, which supports the formation of TiO2 NPs. The optical band-gap energy was determined to be 2.35 eV. Further characterization by XRD supported the crystallinity and purity of the synthesized TiO<sub>2</sub> NPs. These NPs may have effective dye degradation ability. The green-synthesized TiO<sub>2</sub> NPs exhibited interesting photo­catalytic efficacy on methylene blue dye under UV irradiation (using a multi-lamp photo reactor) and anti­bacterial activity against pathogenic organisms like Streptococcus, Staphylococcus, Escherichia coli and Pseudomonas aeruginosa.

Keywords


Antibacterial Activity, Erythrina Variegata, Green Synthesis, Nanoparticles, Photocatalytic Efficacy, Titanium Dioxide

References





DOI: https://doi.org/10.18520/cs%2Fv123%2Fi1%2F59-66