Highly stable AgNPs prepared via a novel green approach for catalytic and photocatalytic removal of biological and non-biological pollutants

Environment International

Mohit Rawat¹  Jagpreet Singh²  Prit Pal Singh³  Ki-Hyun Kim⁴  Pooja Rani⁵  Avtar Singh Matharu⁶  Vanish Kumar⁷  Wei Zhang⁸ 

[1] Corresponding authors.;Environmental Engineering, Hanyang University, Seoul 04763, South Korea;Department of Chemistry, Sri Guru Granth Sahib World University, Fatehgarh Sahib 140406, Punjab, India;;Department of Civil &Department of Nanotechnology, Sri Guru Granth Sahib World University, Fatehgarh Sahib 140406, Punjab, India;Green Chemistry Centre of Excellence, Department of Chemistry, University of York, York YO10 5DD, UK;National Agri-Food Biotechnology Institute (NABI), S.A.S. Nagar, Punjab 140306, India;School of Ecology and Environmental Science, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, PR China;

关键词: Phaseolus Vulgaris;    Silver nanoparticles;    Green synthesis;    4-nitrophenol;    Catalytic activity;    Photocatalytic degradation;   

DOI  :  

来源: DOAJ

【 摘 要 】

Increases in biological and non-biological pollutants pose a significant threat to environmental systems. In an effort to develop an effective means to treat such pollutants, the use of Phaseolus vulgaris (kidney beans) as reducing and capping agents is proposed for the green synthesis of highly stable silver nanoparticles (AgNPs) with a face-centered cubic (fcc) crystalline structure (size range: 10–20 nm). The potent role of the resulting AgNPs was found as triple platforms (photocatalyst, catalyst, and antimicrobial disinfectant). AgNPs were able to photocatalytically degrade approximately 97% of reactive red-141 (RR-141) dye within 150 min of exposure (quantum efficiency of 3.68 × 10-6 molecule.photon-1 and a removal reaction kinetic rate of 1.13 × 10-2 mmol g−1 h−1). The role of specific reactive oxygen species (ROS) in the photocatalytic process and complete mineralization of dye was also explored through scavenger and chemical oxygen demand (COD) experiments, respectively. As an catalyst, AgNPs were also capable of reducing 4-nitrophenol to 4-aminophenol within 15 min. Overall, AgNPs showed excellent stability as catalyst and photocatalyst even after five test cycles. As an antimicrobial agent, the AgNPs are effective against both gram-positive (Bacillus subtilis) and -negative bacteria (Escherichia coli), with the zones of clearance as 15 and 18 mm, respectively. Thus, the results of this study validate the triple role of AgNPs derived via green synthesis as a photocatalyst, catalyst, and antimicrobial agent for effective environmental remediation.

【 授权许可】

Unknown