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Akanksha Gupta1 Sanjeev Yadav2 Prateek Saini2 Ayesha Seth2 Vinod Kumar3

1, Chemistry, Sri Venkateswara College, Delhi, Delhi, India
2, Chemistry, Kirori Mal College, Delhi, Delhi, India
3, Chemistry, Kirori Mal College, Delhi, Delhi, India

Water pollution by different harmful compounds is becoming an increasing global concern. Most industrial dyes, pesticides are toxic, carcinogenic, and mutagenic, and have low biodegradability. Moreover, dye-containing effluents are highly colored, so discarding these effluents into natural water bodies affects the balance of aquatic ecosystems because they can prevent the penetration of sunlight into the water, which results in a reduction in dissolved oxygen content. Therefore, the removal of dyes and pesticides prior to the discharge of wastewater from industries is of great importance. The inadequate treatment and inappropriate disposal of these toxic carcinogenic organic compounds pose a considerable threat to the environment [1].
Several binary oxides such as TiO2, ZnO, SnO2 etc. have been recognized as preferable materials for photocatalytic activities due to their high photosensitivity, low cost, and chemical stability and hence, they have been investigated for the degradation of these pollutants in waste water [2]. Little information is available in the literature regarding the SnO2-RE (RE=rare earth) system [3].
Tin dioxide (SnO2) is a n-type semiconductor that has a wide range of potential applications in gas sensors, catalysts, batteries, transistors, and transparent electrodes. The structure, band gap, and chemical stability of SnO2 are similar to those of titanium dioxide (TiO2), which is a widely used photocatalyst. Moreover, SnO2 has no adverse health effects and is poorly absorbed by the human body when injected or inhaled. Thus, SnO2 is potentially an ideal photocatalyst and possess large surface area. Semiconductor photocatalytic processes are based on the generation of electron–hole pairs by means of band gap radiation. SnO2 has also been used as a component of composite photocatalysts such as SnO2/TiO2, SnO2/ ZnO, and SnO2/ZnO/TiO2 [4]. Doping of rare earth ion in metal oxide introduce defects lowering the effective optical gap and hence leading to a better photoactivity. Ce doped SnO2 is a promising material and several scientists have reported its gas sensing properties for various harmful gases but to the best of our knowledge its photocatalytic activity has not been explored much.
Herein, we present the synthesis and structural characterization of varying concentration of Ce-doped SnO2 nanoparticles. Detailed characterization are attempted based on the PXRD measurements, FTIR, Raman, UV-visible spectroscopy etc. We have successfully degrade the organic dyes and pesticides under UV irradiation, which might be helpful for the wastewater treatment in future.
References
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I. T. Weber, A. Valentini, L.F.D. Probst, E. Longo, E. R. Leite Sens. Actuators B 97 (2004) 31–38
S. P. Kima , M. Y. Choib, H. C. Choia, Mater. Res. Bull. 74 (2016) 85–89

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