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Co-precipitation synthesis of ZnO–TiO2 nanostructure composites for arsenic photodegradation from industrial wastewater

Author:
Arabnezhad, M., Shafiee Afarani, M., Jafari, A.
Source:
International journal of environmental science and technology 2019 v.16 no.1 pp. 463-468
ISSN:
1735-1472
Subject:
arsenic, copper, coprecipitation, industrial wastewater, irradiation, nanomaterials, photocatalysis, photolysis, powders, titanium, zinc, zinc acetate
Abstract:
In present work, controlled TiO₂–ZnO ratio nanostructure composite powders synthesized via co-precipitation method from zinc acetate and titanium tetrachloride as starting materials were obtained. Samples with different Ti/Zn precursor ratios were prepared for the study. Photocatalytic activities of the particles were evaluated under UV and visible light sources, using both arsenic-laced solution and industrial copper smelting wastewater. Results generally show that nanopowder composites are formed. Samples with Ti/Zn precursor ratio of 90:10 and 50:50 showed considerable photocatalytic activities leading to up to 90% arsenic degradation under UV and visible light irradiation; however, compared experientially made a solution in the laboratory, the industrial wastewaters resulted in less arsenic photodegradation.