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Fabrication of Schiff base coordinated ZnS nanoparticles for enhanced photocatalytic degradation of chlorpyrifos pesticide and detection of heavy metal ions

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Journal of Materiomics 2019年第3期5卷 446-454页

作者： Dasari Ayodhya guttena veerabhadram Department of Chemistry University College of ScienceOsmania UniversityHyderabad500007Telangana StateIndia

We report the simple synthesis of zinc sulfide nanoparticles(ZnS NPs)by a co-precipitation method using Schiff base,(2-[(4-methoxy-phenylimino)-methyl]-4-nitrophenol)as a capping *** formation of ZnS NPs and their optical,structural,thermal properties and morphologies were studied by means of UVevis DRS,PL,FTIR,XRD,SEM,TEM,and *** optical properties and quantum confinement effect of the products were confirmed by means of spectroscopic *** have accessed the photocatalytic ability of the prepared ZnS and Schiff base capped ZnS NPs in the degradation of chlorpyrifos under UV light irradiation for the prevention of environmental *** prepared ZnS NPs exhibited a selective probe detection of Fe^(3+),Cr^(2+) and Cd^(2+) ions by fluorometrically and the emission band which disappears in the presence of increasing concentrations of Fe^(3+),Cr^(2+) and Cd^(2+) *** work suggested that the synthesized Schiff base capped ZnS NPs could be a potential selective photocatalyst for the degradation of toxic pollutants and a selective probe sensor for the detection of heavy metal ions.

关键词： Schiff base ZnS nanoparticles Chlorpyrifos pesticide Heterogeneous photocatalysis Fluorescence sensor

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Synthesis and Characterization of C-TiO_2/FeTiO_3 and CQD/C-TiO_2/FeTiO_3 Photocatalysts with Enhanced Photocatalytic Activities Under Sunlight Irradiation

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Acta Metallurgica Sinica(English Letters) 2016年第1期29卷 17-27页

作者： Ramakrishna Dadigala Bhagavanth Reddy Gangapuram Rajkumar Bandi Ayodhya Dasari veerabhadram guttena Department of Chemistry Osmania University

Sunlight-driven C-TiO2/FeTiO3 composites were synthesized with different weight fractions of FeTiO3. The as-prepared samples were characterized by UV-Visible diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction analysis, transmission electron microscopy, scanning electron microscopy, energy-dis- persive X-ray spectroscopy, and photoluminescence. Under sunlight irradiation, the C-TiO2/FeTiO3 photocatalysts degraded methyl orange （MO） efficiently and displayed much higher photocatalytic activity than that of pure FeTiO3 or carbon-doped titanium dioxide （C-TiO2）, and the C-TiOE/FeTiO3 photocatalyst with 10 wt% of FeTiO3 exhibited the highest photocatalytic activity. The enhancement of photocatalytic activity was mainly ascribed to the formation of a heterojunction between C-TiO2 and FeTiO3, which facilitated the transfer and separation of photogenerated electron-hole pairs. The quenching effects of different scavengers demonstrated that the reactive superoxide radicals （02-） and hydroxyl radicals （OH） played a major role in the MO degradation. The possible photocatalytic mechanism is discussed on the basis of the band structures of C-TiO2 and FeTiO3. To further enhance the photocatalytic efficiency, double-heterojunctioned CQD/C-TiO2/FeTiO3 composite was prepared by loading carbon quantum dots onto the C-TiO2/FeTiO3 surface.

关键词： C-TiO2 FeTiO3 CQD Composites Sunlight photocatalytic activity

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