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RISS 인기검색어
- 검색키워드
- 저자 : Rashi Gusain (검색결과 2 건)
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Nthambeleni Mukwevho,Rashi Gusain,Elvis Fosso-Kankeu,Neeraj Kumar,Frans Waanders,Suprakas Sinha Ray 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
In this study, a ZnO/Ag/GO nanocomposite was synthesised and used as photocatalyst for effectivephotodegradation of naphthalene from simulated wastewater under visible light. Chemical andmorphological characterisation were successfully done using XRD, PL, UV–vis, FTIR, XPS, FESEM andHRTEM analytical tools. Photocatalytic degradation experiments werefirst carried out under darkconditions and then under visible-light irradiation. Adsorption study of naphthalene prior tophotocatalysis using synthesised material was thoroughly done by studying the kinetics and adsorptionisotherm models. All as-synthesised materials (ZnO nanoparticles, binary ZnO/Ag, and ternary ZnO/Ag/GO nanocomposites) followed pseudo-second-order kinetics and the Freundlich adsorption isotherm,confirming the adsorption on hetero-structural surface. ZnO/Ag/GO could successfully adsorb 80%naphthalene in 20 min, with 500 mg.g 1 adsorption capacity. High adsorption of naphthalene moleculeson ZnO/Ag/GO surfaces trigger improved photodegradation efficiency upon light irradiation. Incorporationof plasmonic Ag nanoparticles and 2D graphene oxide (GO) to ZnO semiconductor improved thephotocatalytic degradation efficiency of naphthalene, achieving up to 92% degradation in 50 min. Thephotodegradation of naphthalene follows the Langmuir-Hinshelwood kinetics model and was foundacceptable to express the photodegradation rate. Furthermore, the ZnO/Ag/GO photocatalyst could easilybe recycled and reused forfive cycles, maintaining up to 85% of its photodegradation efficiency.
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Sangita Kumari,Rashi Gusain,Niranjan Kumar,Om P. Khatri 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.42 No.-
Lamellar-structured nanomaterials are gaining large interest for tribological applications owing to theirremarkable mechanical and low shearing properties. Herein, polyethylene glycol (PEG)-mediatedhierarchical microspheres of MoS2 nanosheets are synthesized by a facile and single-step hydrothermalreduction of ammonium molybdate in the presence of thiourea. The PEG functions as a soft templatingmaterial and provides hierarchical microspheres of MoS2 nanosheets. Detailed chemical andmicrostructural features of hierarchical microspheres of MoS2 nanosheets are probed by FTIR[14TD$DIF], XPS,Raman, XRD, TGA, FESEM, and HRTEM analyses. Each nanosheet of MoS2 [15TD$DIF]microspheres is composed oflimited number (10–20) of atomic-thick lamellae[3TD$DIF] as deduced from HRTEM images. The MoS2microspheres, as[4TD$DIF] additive[5TD$DIF] provide significantly improved lubrication properties for steel tribo-pair byreducing the friction ( 21%) and the wear (42%) compared to that of fully formulated 10W40 lubricant. The elemental mapping of worn surfaces revealed the deposition of MoS2 nanosheets on the contactinterfaces. The improved lubrication properties are attributed to collective effect of deposition ofdelaminated MoS2 lamellae on the contact interfaces, low shearing and high mechanical strength ofMoS2 nanosheets.
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