zinc oxide mediated solar photocatalysis

Publication Type: Edited Book

Book Name: Futuristic Trends in Chemical Material Sciences & Nano Technology V3B7
Authors: Ashokrao B. Patil, Satish K. Pardeshi
Keywords: Photocatalysis, Zinc oxide, Sunlight, Degradation, Mechanochemical
Area/Stream: / Inorganic Chemistry /
Published in: IIP Series
Volume: 3, Month:May,Year:2024
Page No.: 205-233
e-ISBN: 978-93-5747-960-8
DOI/Link: https://www.doi.org/10.58532/V3BECS7P8CH1

Abstract:

Zinc oxide photo catalyst samples were synthesized by co-precipitation, solid state reaction and mechano chemical method. The photo catalysts thus prepared were characterized by various techniques such as powder XRD, SEM, EDX, XPS, TG-DTA, FT-IR, PL and UV-visible spectrophotometer. The solar photo catalytic activity of these semiconductors was examined by means of degradation of hazardous and endocrine disrupting chemicals such as Phenol, Resorcinol, and Bisphenol A in batch photo reactor. The effect of various parameters such as calcination temperature, amount of photo catalyst, concentration of substrate, pH of the suspension and sunlight irradiation time were investigated for maximum photo catalytic degradation (PCD) of these organic compounds. The extent of PCD was primarily determined in terms of decrease in absorbance while complete mineralization of substrate was confirmed by chemical oxygen demand (COD) method. The XRD data of pure ZnO matches to that of JCPDS card number J-36-1451 indexed for hexagonal wrutzite structure. Calcination temperature was found to affect the crystallite size and morphology of ZnO. The PCD of phenol, resorcinol and Bisphenol A (substrates) over ZnO was found to be more effective under solar light in comparison to artificial UV and visible light irradiation. Lower calcination temperature of photo catalyst (400 to 500oC) favors PCD efficiency because of suitable morphology and optimum defect sites as a result of fast crystallite growth rate (E1 = 1.88 kJ/mol). ZnO synthesized by mecha nochemical method shows better PCD efficiency in sunlight. The detailed mechanism of PCD of phenol, resorcinol and bisphenol A were proposed with the identification of intermediates.

Cite this: Ashokrao B. Patil, Satish K. Pardeshi,ZINC OXIDE MEDIATED SOLAR PHOTOCATALYSIS, In: Futuristic Trends in Chemical Material Sciences & Nano Technology V3B7, IIP Series, Volume 3, May, 2024, pp. 205-233, Iterative International Publishers IIP, E-ISBN: 978-93-5747-960-8, DOI/Link: https://www.doi.org/10.58532/V3BECS7P8CH1

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