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A novel method of water remediation of organic pollutants and industrial wastes by solution- route processed CZTS nanocrystals

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Journal of Materiomics 2021年第5期7卷 904-919页

作者： Pooja Semalti vikash sharma Shailesh Narain sharma CSIR-National Physical Laboratory(NPL) Dr.K.S.Krishnan RoadNew Delhi110012India Academy of Scientific and Innovative Research(AcSIR) Council of Scientific&Industrial Research(CSIR)-Human Resource Development Centre(CSIRHRDC)CampusGhaziabadUttar Pradesh201002India

CZTS(Cu_(2)ZnSnS_(4)),a P-type semiconductor with a direct bandgap(1.2-1.7eV),earth-abundant,non-toxic,and has a large absorption coefficient makes it extremely useful in optoelectronics and light-harvesting applications.In this work,CZTS is prepared by an ingenious,cost-effective colloidal route using the‘hotinjection’method with the usage of different ligands.The XRD and Raman spectroscopy shows the single-phase highly crystalline CZTS nanoparticles with kesterite structure.The TEM results show that the size of CZTS nanoparticles is about 2-5 nm and monodispersity is confirmed by DLS(Dynamic Light Scattering).FTIR confirms the presence of different ligands used in CZTS preparation.The Uv-vis absorption shows the direct bandgap of 1.5-1.7eV.The contact angle study shows the hydrophobic nature of as-synthesized CZTS nanoparticles which were further ligand exchanged with L-cysteine hydrochloride to make it hydrophilic to study the photocatalytic degradation activity of organic pollutants and industrial waste in the water.The photocatalysis experiments were performed under two conditions:(i)under bare sunlight(Intensity~900 W/m^(2))(ii)focussing the sample under the sunlight via converging lens(1800 W/m^(2)).The photocatalytic efficiencies were then compared and the best photocatalytic efficiency achieved under sunlight was 98.4%for organic pollutants and 75%for industrial waste via converging lens while the corresponding efficiencies with bare sunlight were 98.1% and 73% respectively.To the best of the author’s knowledge,a rapid and highly efficient photocatalysis of CZTS NPs employing a converging lens for water-remediation without the usage of noble&transition-metals has been reported for the first time.

关键词： Photocatalysis Copper zinc tin sulfide(CZTS) Converging lens Industrial waste Hot injection Organic pollutants Nanoparticles TOP TOPO

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A catalyst-free new polyol method synthesized hot-pressed Cu-doped Bi2S3 nanorods and their thermoelectric properties

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Nano Research 2016年第11期9卷 3291-3304页

作者： Tarachand vikash sharma Ranu Bhatt Vedachalaiyer Ganesan Gunadhor Singh Okram UGC-DAE Consortium for Scientific Research Indore 452001 India Technical Physics Division Bhabha Atomic Research Centre Mumbai 400085 India

This is the first report on the thermoelectric properties of a catalyst-free polyol method used to prepare stoichiometric Bi2-xCuxS3 samples, x = 0.1, 0.2, 0.3, 0.4, via hot pressing. Various systematic approaches to arrive at in their stoichiometric compositions are explored precisely with introduction of excess precursor of S. X-ray diffraction data analysis using Rietveld refinement confirms a polyhedral orthorhombic crystal structure with a space group Pnma, in contrast to Pbnm reported earlier. Raman data further substantiates this. X-ray photoelectron spectroscopy confirms the valence states of the constituent elements （Bi^3＋, Cu^2＋, and S^2-） and energy dispersive X-ray analysis corroborates their compositions. The particle sizes of the pure Bi2S3 nanoparticles were 20, 35, and 82 nm as determined from the Scherrer formula, atomic force microscopy, and dynamic light scattering, respectively. Their transmission electron microscopy image shows rod-like nanostructures elongated in the 〈010〉 direction with an average diameter of 23 nm and a length of several hundreds of nanometers. A 34% improvement in the thermoelectric figure of merit is observed for Bi.6Cu0.4S3 as compared to pure Bi2S3 at 300 K.

关键词： Bi2S3 polyol nanorods thermoelectrics

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Impact of polyherbal formulations MEF-4 and MEF-8 on high fat diet induced obesity in SD rats

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Asian Journal of Traditional Medicines 2020年第4期15卷 164-171页

作者： Vijay Kumar Singh Debashish Paramanick vikash sharma Shikha Yadav School of medical and allied science Galgotias UniversityPlot No.2Yamuna ExpyOppositeBuddha International CircuitSector 17AGreater NoidaUttar Pradesh 203201

As a traditional healing system of India,herbal medicines have been used as therapeutics over a long period of time.In the present study,polyherbal formulations MEF-4 and MEF-8 from two pharmacologically important plants,Camelia Sinensis(CS)and Citrus Aurantium(CA),were studied in vivofor their potential in reducing obesity and hyperlipidemia.These twoformulations are different from each other in the manner that they contain two different polymers and that MEF-4 was prepared through cold extraction of CS and Cl and MEF-8 was prepared through hot extraction method.Hyperlidemia leads to many complications like hypertension,stroke and heart attack.It also creates complications to the patients suffering from chronic disorders like diabetes and stress.The aim of the present investigation is to assess the effect of these twoformulations on the possibility of reducing obesity.The rodents enlisted in hyperlipidemia had taken a high-fat diet for about 14 d.The hyperlipidemic rodents of 250 g were taken in the study,treated with standard eating regimen and high-fat eating regimen orally for 30 d.After treatment for 30 d,blood tests from the MEF-4/MEF-8/standard/vehicle were gathered and an impact on body weight,hematology and lipid profile was investigated.Statistical analysis showed there was a significant increase in cholesterol(CHL),low density lipoprotein(LDL),triglyceride(TG),phospholipids(PHL)change in the body weight of group Ⅰ(HFD)and Ⅱ(STD)as compared to group Ⅲ(MEF-4)and group IV(MEF-8).The decline in triglyceride(P<0.01)was also noted for MEF-8 when compared to control and standard.

关键词： polyhedral hyperlipidemia lipid profile obesity

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Green Approach for <i>In-Situ</i>Growth of CdS Nanorods in Low Band Gap Polymer Network for Hybrid Solar Cell Applications

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Advances in Nanoparticles 2014年第3期3卷 106-113页

作者： Ramil K. Bhardwaj Vishal Bharti Abhishek sharma Dibyajyoti Mohanty vikash Agrawal Nakul Vats Gauri D. sharma Neeraj Chaudhary Shilpa Jain Jitender Gaur Kamalika Banerjee Suresh Chand J & S Research and Innovations Delhi India Physics of Energy Harvesting CSIR-National Physical Laboratory New Delhi India Physics of Energy Harvesting CSIR-National Physical Laboratory New Delhi India School of Science India Gandhi National Open University New Delhi India School of Science India Gandhi National Open University New Delhi India

In-situ growth of CdS nanorods (NRs) has been demonstrated via solvothermal, in a low band gap polymer, poly [[4,8-bis[(2-ethylhexyl)oxy] benzo [1,2-b:4,5-b’] dithiophene-2,6-diyl] [3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno [3,4-b] thiophenediyl]] (PTB7). It is a high yielding, green approach as it removes use of volatile and hazardous chemicals such as pyridine as ligand which are conventionally used to synthesize precursors of CdS (NRs). Moreover the solvothermal process is a zero emission process being a close vessel synthesis and hence no material leaching into the atmosphere during the synthesis. The PTB7:CdS nanocomposite has been characterized by SEM, XRD, FTIR, UV-visible spectroscopy techniques. The photoluminescence (PL) spectroscopy study of PTB7 with CdS NRs has shown significant PL quenching by the incorporation of CdS NRs in PTB7;this shows that CdS NRs are efficient electron acceptors with the PTB7. The PTB7:CdS is used as active layer in the fabrication of hybrid solar cells (HSC) as donor-acceptor combination in the bulk heterojunction (BHJ) geometry. The HSCs fabricated using this active layer without any additional supporting fullerene based electron acceptor has given power conversion efficiency of above 1%.

关键词： CdS Nanorods PTB7 In-Situ Growth Solvothermal Hybrid Solar Cell

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