期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
卷 183, 期 -, 页码 349-356出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2018.05.006
关键词
Zinc oxide nanoparticles; Green synthesis; Conyza canadensis; Antibacterial activity; Catalytic reduction
资金
- China Scholarship Council [2016GXYW41]
- National Natural Science Foundation of China [21271017]
- National Science and Technology Supporting Plan of the Twelfth Five-year [2014BAE1280101]
- Fundamental Research Funds for the Central Universities [YS1406]
A green route to fabricate nanoparticles has emerged as a revolutionary approach. The reported work presents a green approach to synthesize ZnO nanoparticles using Conyza canadensis plant leaves extract. The synthesis of ZnO was conducted at two different temperatures i.e. 30 degrees C and 80 degrees C. ZnO nanoparticles prepared at 80 degrees C were smaller in size and exhibited spherical morphology. The prepared nanomaterials were examined for the reduction of organic dyes i.e. methylene blue and methyl orange. The fabricated ZnO nanoparticles synthesized at 80 degrees C were found to be highly active for the reduction of aforementioned dyes with 94.5% reduction of MO and 85.3% reduction of MB in 45 min and 20 min respectively. The rate constant (k) for this reduction of MO was found to be 5.781 x 10(-3) s(-1) in the absence of a catalyst and 5.843 x 10(-2) s(-1) in the presence of ZnO NPs catalyst. The rate constant (k) for the reduction of MB was found to be 4.7 x 10(-3) s(-1) in the absence of a catalyst and 9.936 x 10(-3) s(-1) in the presence of ZnO NPs catalyst. ZnO nanoparticles synthesized at 80 degrees C were examined for their antibacterial activity. The biogenic ZnO nanoparticles exhibited strong antibacterial activity against E. colt and S. aureus with a zone of inhibition (16 mm) and (14 mm) respectively. This high antibacterial and catalytic activity of biogenic ZnO nanoparticles can be attributed to its small size, good dispersion, and welldefined morphology.
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