Catalytic potential of bio-synthesized silver nanoparticles using Convolvulus arvensisextract for the degradation of environmental pollutants.

J Photochem Photobiol B. 2018 Apr;181:44-52. doi: 10.1016/j.jphotobiol.2018.02.024. Epub 2018 Feb 21.

Rasheed T1, Bilal M2, Li C3, Nabeel F3, Khalid M4, Iqbal HMN5.

Author information

1

The School of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address: masil@sjtu.edu.cn.

2

State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.

3

The School of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.

4

School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.

5

Tecnologico de Monterrey, School of Engineering and Sciences, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey, N.L. CP 64849, Mexico.

Abstract

Herein, we reported a facile, green and environmental friendlier biosynthesis of silver nanoparticles using the Convolvulusarvensis extract. The influences of various physicochemical factors such as the concentration of the plant extract, reaction time, and different pH levels were investigated by UV-Vis spectroscopy. The UV-Visible absorption spectrum of biogenic silver nanoparticles at λmax around ~400 nm suggested the biosynthesis of silver nanoparticles. Fourier transform infrared spectroscopy was employed to confirm the chemical transformation and role of various phyto-reductants in the conversion of Ag+ to Ag0. The surface morphology, topography, and elemental composition were analyzed by scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray spectroscopy, respectively. X-ray diffraction corroborated the face-centered cubic crystalline structure. The dynamic light scattering and zeta potential demonstrate the size distribution (90.9 nm) and surface charge (-18.5). Finally, the newly developed C. arvensis based silver nanoparticles were exploited as a catalyst for the catalytic reduction of azo dyes in the presence of NaBH4 as a reducing agent, and reducing the activity of C. arvensis based silver nanoparticles was evaluated by a decrease in optical density using UV-Vis spectrophotometer. The nanoparticles developed herein displayed potential efficiency for the degradation of all the tested dye pollutants. Conclusively, plant-based synthesis of nanoparticles provides an environmentally-responsive option for the reduction of highly environmental-polluted organic compounds including toxic azo dyes as compared to chemical and physical methods.

KEYWORDS:

Azo dyes; Bio-fabrication; Catalytic activity; Characterization; Plant extract; Silver nanoparticles

PMID:

 

29499463

 

DOI:

 

10.1016/j.jphotobiol.2018.02.024