ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Highly effective CuO catalysts synthesized by various routes for discoloration of methylene blue
Qian Liu, Qingwen Wang, Wenyong Deng, Lei Gong, Aiqin Dong, Changxiang Liu, Runying Dai, Xigen Huang, and Zhong Huang
College of Science, Jiangxi Agricultural University, Nanchang, People’s Republic of China
Received: 7 June 2019 Accepted: 1 October 2019
A series of CuO catalysts were fabricated through hydrothermal process, thermal decomposition of the precursors of CuC2O4 synthesized by soft reactive grinding route and oxalate-gel co-precipitation method, respectively. The discoloration of methylene blue in the presence of H2O2 was selected as the activity test model reaction. The as-prepared catalysts were characterized by powder X-ray diffraction, scanning electron microscopy, infrared diffuse reflectance spectrum, and N2-adsorption analysis. The CuO obtained from calcination of dry-grinding-derived oxalate precursor has better catalytic performance than those prepared by conventional wet-chemical method. Examination of the structural characterization shows that the small particle size and relatively high surface area are the main reasons for its excellent activity. Moreover, the pseudo-first-order kinetics model was also employed to understand the discoloration behavior of grinding-derived CuO and the activation energy was calculated to be 56.5 kJ mol−1. The current preparation mechanism of solid-state synthetic technique was also proposed by tracking the precursor structure.
Keywords: CuO; Soft reactive grinding route; Methylene blue; Kinetics
Full paper is available at www.springerlink.com.
Chemical Papers 74 (4) 1113–1121 (2020)
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