Volume 22, Issue 7 e202100299
Review

Strategies to Enhance ZnO Photocatalyst's Performance for Water Treatment: A Comprehensive Review

Abdo Hezam

Abdo Hezam

Center for Materials Science and Technology, University of Mysore, Vijana Bhavana, Manasagangothiri, 570 006 Mysuru, India

Leibniz-Institute for Catalysis at the University of Rostock, 18059 Rostock, Germany

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Dr. Q. A. Drmosh

Corresponding Author

Dr. Q. A. Drmosh

Interdisciplinary Research Center for Hydrogen and Energy Storage (HES), King Fahd University of Petroleum and Minerals (KFUPM), 31261 Dhahran, Saudi Arabia

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Deepalekshmi Ponnamma

Deepalekshmi Ponnamma

Center for Advanced Materials, Qatar University, P.O. Box 2713, Doha, 122104 Qatar

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Mohammed Abdullah Bajiri

Mohammed Abdullah Bajiri

Department of Studies and Research in Industrial Chemistry, School of Chemical Sciences, Kuvempu University, 577 451 Shankaraghatta, India

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Mohammad Qamar

Mohammad Qamar

Interdisciplinary Research Center for Hydrogen and Energy Storage (HES), King Fahd University of Petroleum and Minerals (KFUPM), 31261 Dhahran, Saudi Arabia

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K. Namratha

K. Namratha

DOS in Earth Science, University of Mysore, Mysuru, 570 006 India

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Mina Zare

Mina Zare

Center for Materials Science and Technology, University of Mysore, Vijana Bhavana, Manasagangothiri, 570 006 Mysuru, India

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M. B. Nayan

M. B. Nayan

Center for Materials Science and Technology, University of Mysore, Vijana Bhavana, Manasagangothiri, 570 006 Mysuru, India

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Sagheer A. Onaizi

Sagheer A. Onaizi

Interdisciplinary Research Center for Hydrogen and Energy Storage (HES), King Fahd University of Petroleum and Minerals (KFUPM), 31261 Dhahran, Saudi Arabia

Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, 31216 Dhahran, Saudi Arabia

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K. Byrappa

Corresponding Author

K. Byrappa

Adichunchanagiri University, N.H.75, 571448 B. G. Nagara, Mandya District, India

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First published: 04 February 2022
Citations: 25

Abstract

Despite the photocatalytic organic pollutant degradation using ZnO started in 1910–1911, many challenges are still ahead, and several critical issues have to be addressed. Large band gap, and short life-time of photogenerated electrons and holes are critical issues negatively affect the photocatalytic activity of ZnO. Various approaches have been introduced to overcome these issues including intrinsic doping, extrinsic doping, and heterostructure. This review introduces unique and deep insights into tuning of the photocatalytic activity of ZnO. It starts by description of how to tune the photocatalytic activity of pristine ZnO through tuning its morphology, surface area, exposed face, and intrinsic defects. Afterward, the review explains how the Z-scheme approach succeed to address the redox weakened issue of heterojunction approach. In general, this review provides a clear image that helps the researcher to tune the photocatalytic activity of pristine ZnO and its heterostructure.

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