Journal
APPLIED CLAY SCIENCE
Volume 95, Issue -, Pages 95-103Publisher
ELSEVIER
DOI: 10.1016/j.clay.2014.03.016
Keywords
Layered double hydroxides; Homogeneous precipitation; Photocatalysis; Solar light; Methylene blue
Funding
- National Science Foundation of China [41273122, 41073058, 40973075]
- Research Fund for the Doctoral Program of Higher Education of China [20100172110028]
- Natural Science Foundation of Guangdong Province, China [9351064101000001]
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ZnAlTi layered double hydroxides (LDHs) with different Zn:Al:Ti ratios were synthesized by homogeneous precipitation method utilizing urea hydrolysis. The synthesized samples were calcined at 873 K in order to obtain mixed metal oxides with high photocatalytic activity. Multiple characterizations such as XRD, FT-IR, TG-DSC, XPS, XRF, N-2 adsorption-desorption isotherms and UV-vis DRS were carried out. The photocatalytic activity was evaluated by degradation of methylene blue (MB) dye under solar light irradiation. The experimental parameters such as the catalyst with different molar ratios, catalyst dose, initial MB concentration, and initial pH were studied in detail. A maximum of 99% photodegradation of MB was achieved with the catalyst loading of 1.0 g L-1 and initial MB concentration of 10 mg L-1, at the condition of neutral pH. The kinetic study indicated that the photocatalytic process was well fitted to the Langmuir-Hinshelwood model. Furthermore, after three cycles, the degradation of MB was still close to 90%, indicating that the photocatalyst had high stability for recycle. (C) 2014 Elsevier B.V. All rights reserved.
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