Preparation of a Green Photocatalyst by Immobilization of Synthesized ZnO Nanosheets on Scallop Shell for Degradation of an Azo Dye
Mehdi Shirzad-Siboni, Alireza Khataee, Behrouz Vahid, Sang W. Joo and Sevda Fallah
Affiliation: Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
Photocatalysis of C.I. Acid Red 14 (AR14) by immobilized ZnO nanosheets on scallop shell was investigated.
The mean crystallite size of the ZnO nanosheets on scallop shell sample was about 15 nm. Degradation efficiency of
AR14 by immobilized ZnO is more efficient than suspension form in identical conditions. Effect of operational parameters
including nanocatalyst dosage, pH and initial dye concentration on the UV/ZnO-scallop process was studied. Kinetic
of the photocatalytic process was explained in terms of the Langmuir–Hinshelwood model. The values of the kinetic rate
and the Langmuir adsorption constants were determined as 0.104 1/(mg/L) and 0.413 (mg/L)/min, respectively. The prepared
photocatalyst demonstrated the proper photocatalytic activity even after five successive cycles.
Keywords: Nanocatalyst, nanosheet, photocatalysis, scallop shell, textile dye, zinc oxide.
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