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Increasing demand of pure and accessible water and improper disposal of waste into the existing water resources are the major challenges for sustainable development. Nanoscale technology is an effective approach that is increasingly being applied to water remediation. Compared to conventional water treatment processes, silver nanotechnology has been demonstrated to have advantages due to its anti-microbial and oligodynamic (biocidal) properties. This review is focused on environmentally friendly green syntheses of silver nanoparticles (AgNPs) and their applications for the disinfection and microbial control of wastewater. A bibliometric keyword analysis is conducted to unveil important keywords and topics in the utilisation of AgNPs for water treatment applications. The effectiveness of AgNPs, as both free nanoparticles (NPs) or as supported NPs (nanocomposites), to deal with noxious pollutants like complex dyes, heavy metals as well as emerging pollutants of concern is also discussed. This knowledge dataset will be helpful for researchers to identify and utilise the distinctive features of AgNPs and will hopefully stimulate the development of novel solutions to improve wastewater treatment. This review will also help researchers to prepare effective water management strategies using nano silver-based systems manufactured using green chemistry., (Copyright © 2022 Elsevier Ltd. All rights reserved.)

Water remediation is an essential component for sustainable development. Increasing population and rapid industrialization have contributed to the deterioration of water resources. In particular, effluents from chemical, pharmaceutical, petroleum industries, and anthropogenic activities have led to severe ecological degradation. Many of these detrimental pollutants are highly toxic even at low concentrations, acting as carcinogens and inflicting severe long-lasting effects on human health. This review underscores the potential applications of engineered carbon-based materials for effective wastewater treatment. It focuses on the performance as well as efficiency of activated carbon, graphene nanomaterial, and carbon nanotubes, both with and without chemical functionalization. Plausible mechanisms of action between the chemically functionalized adsorbent and pollutants are also discussed. Based on the keywords from the literature published in the recent five years, a statistical practicality-vs-applicability analysis of these three materials is also provided. The review will provide a deep understanding of the physical or chemical interactions of the wastewater pollutants with carbon materials., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2021 Elsevier B.V. All rights reserved.)

Photocatalysis comprises an immense interest for resolving current energy and environmental problems by converting sun light into chemical energy. Here, we developed FeVO4/graphene nanocomposites by using a facile hydrothermal method and characterized the product through powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectrometry, UV–visible spectroscopic analysis, Brunauer–Emmett–Teller, photoluminescence spectroscopy and electrochemical impedance spectroscopy. The visible light-assisted photocatalytic activeness was determined by decomposition of methylene blue (MB) dye solution. The outcomes show that the FeVO4/graphene nanocomposites exhibit enhanced photocatalytic efficiency for the oxidization of MB on a maximum degradation removal rate of decolonization 92% while compared with pure FeVO4 nanocomposite (63%). This is attributed to enhanced light absorption capacity, long lifetime of photo-generated charge carriers in FeVO4/graphene nanocomposite and the greater surface area which allow greater extent of adsorption of dye molecules at the catalyst surface. The possible photocatalytic degradation mechanism of FeVO4 and FeVO4/graphene was proposed and critically discussed. [ABSTRACT FROM AUTHOR]

Bi1- xSm xFe1- yMn yO3 ( BSFMO, x = 0.0, 0.05; y = 0.0, 0.05, 0.10, 0.15, 0.20, 0.25) nanoparticles were synthesized by using double solvent sol-gel method. Photocatalytic activity was investigated under UV and visible-light illumination. The structural, morphological, and optical properties were analyzed by X-ray diffraction, scanning electron microscopy, and UV-vis spectroscopy respectively. The crystallite size of BiFeO3 ( BFO) decreases from (57.3-17.2 nm) with the increase in Sm and Mn-doping concentration. The surface morphology shows that the pure and Sm-doped BFO nanoparticles are irregular in shape but changes to spherical shape after Mn-doping up to 25%. The band-gap engineering of BFO nanoparticles is achieved by co-doping of Sm and Mn. The band-gap of BFO could be tuned successfully from 2.08-1.45 eV, which may be due to the distortion induced in Fe-O octahedron and the rearrangement of molecular orbitals. These results give rise to enhanced photocatalytic activity by degradation of organic dyes ( MB, CR, and MV) under the visible-light illumination. [ABSTRACT FROM AUTHOR]

• First time Pt doped Zn 4 V 2 O 9 nanoparticles reported for the degradation of MB dye. • Pt/Zn 4 V 2 O 9 showed excellent visible light depend photocatalytic activity. • Methylene Blue dye degraded 100% within 150 mints over 3.0 wt% Pt/Zn 4 V 2 O 9. • Pt in cooperates with Zn 4 V 2 O 9 to raise the light absorption range in visible light. • Pt co-catalysts small particle allow more active agent sites at Zn 4 V 2 O 9 surface. • This method provides a facile and cost effective manufacturing process. In this report, Platinum (Pt) doped Zinc Vanadate (Zn 4 V 2 O 9) nanoparticles were prepared by sonication assisted hydrothermal method. The composition, crystallinity, and photo-absorption attributes were characterized by; XRD, SEM, EDX, FTIR, BET, and PL techniques. UV–Vis DRS reflectance spectroscopy was used to find the optical energy bandgap. Photocatalytic responses of the Pt/Zn 4 V 2 O 9 heterostructures were checked against Methylene Blue (MB) dye under visible light. The results exhibited that photocatalytic response was significantly enhanced after the Pt loaded moieties on Zn 4 V 2 O 9 as compared to pure Zn 4 V 2 O 9 composite. The improved photocatalytic response has been ascribed to the higher electron transfer from the semiconductor to the metal surface and as a result, hinders the fast electron-hole recombination. Pt in cooperation with Zn 4 V 2 O 9 enhanced the light absorption intensity range from UV to visible region of light. The small Pt co-catalysts particles close intact with Zn 4 V 2 O 9 and generate a nanoporous structure which offering more active agent sites. [ABSTRACT FROM AUTHOR]