Application of Silver Nanoparticles for Water Treatment

Abstract

In recent past development of silver nanoparticles and their application in the treatment of wastewaters is becoming a major area of research. It is mainly applicable to the removal of three major pollutants like pesticides, heavy metals, and microorganisms. Variety of synthesis techniques have been reported for preparation and characterization of silver nanoparticles. In our research, we synthesized Ag nanoparticles supported on ZrO 2 and ZrO 2-CeO 2 by a "deposit-precipitation method" as the first step and later sequentially synthesized Ag-Au supported on ZrO 2 and ZrO 2-CeO 2 by Redox method. Catalysts were evaluated in catalytic wet air oxidation (CWAO) of methyl tert-butyl ether and phenol. The CWAO is a liquid phase process for the treatment of organic pollutants operating at temperatures in the range of 100-325°C at 5-200 bar pressures. The selectivity and efficient of catalysts were evaluated by total organic carbon (TOC) and high-performance liquid chromatograph (HPLC). Ideally, the total mineralization of pollutants into CO 2 and H 2 O is preferred.

A Review on Silver Nanoparticles: Classification, Various Methods of Synthesis, and Their Potential Roles in Biomedical Applications and Water Treatment

“…The catalytic application of NPs for water purification may be summarized for three fundamental varieties of contaminants: halogenated organics that include pesticides, heavy metals, and microorganisms [241]. By changing the characteristics of surface functionalization of AgNPs and selecting specific ligands, the particles can be made selective to specific analytes and increase their sensitivity.…”

Silver Nanoparticles Stable to Oxidation and Silver Ion Release Show Size-Dependent Toxicity In Vivo

“…There are over 1400 consumer and commercial products where silver nanoparticles (Ag-NPs) are incorporated such as food packaging materials [1][2][3], waste-water treatment [4,5], topical ointments or wound healing gels [6][7][8][9][10], coatings on medical devices such as stents to prevent biofilm formation [11][12][13], paints, and anti-reflective coatings, and fabric cleaning chemicals [14][15][16]. The use of AgNPs in these applications predominantly rests on their superior antimicrobial properties [13,[17][18][19][20][21][22].…”

Tuning stable noble metal nanoparticles dispersions to moderate their interaction with model membranes

“…Au nanoparticles are employed in nanomedicine for photothermal therapy [3] drug delivery [4] and tissue imaging [5]. Ag nanoparticles, which have antimicrobial properties, have been utilised for disinfection of water [6] and conveying antimicrobial properties to materials [7]. Accordingly there is an understandable concern about their biological activity to living organisms and potential release into environmental systems.…”