Enhanced degradation effect of nano-PAA–CuCl2 with controllable 3D structure as heterogeneous Fenton-like catalyst over a wide pH range
Dye wastewater treatment has been a hot spot of scientific research and technological development. One kind of porous CuCl2 film with controllable three-dimensional structure was synthesized on the top surface of nanoporous anodic alumina (nano-PAA) by self-assembled method. The nano-PAA–CuCl2 film and H2O2 form a heterogeneous Fenton-like catalytic system, and the catalysts were characterized by EDS, XPS and FE-SEM. Then, the main parameters affecting the degradation of Rhodamine B (RhB) were investigated in detail. Under the optimum experimental conditions, i.e., initial pH 3.3, initial H2O2 concentration 14 mmol/L, nano-PAA–CuCl2 generated with 8 × 10−4 mol/L CuCl2 solution, RhB was completely degraded four times. Even the degradation rates were still as high as 97.1% and 94.8% when the nano-PAA–CuCl2 catalyst was reused for the fifth and sixth times, respectively. In addition to enhancing the catalytic activity, the pH of the treated solution had a wide range value, i.e., 2–8, with an optimal value of 5.8. At last in the paper, a degradation mechanism of heterogeneous Fenton-like catalytic degradation of RhB by nano-PAA–CuCl2/H2O2 system is proposed, the reaction kinetics accorded with the pseudo-first-order equation. All the results indicate that the nano-PAA–CuCl2 has practical prospects for H2O2-driven Fenton-like treatment of organic dye wastewater, with the advantages of green and cost-effective, stability and reusability.
This project was supported by the National Natural Science Foundation of China (Grant Nos. 61775181, 61378083), the International Cooperation Foundation of the National Science and Technology Major Project of the Ministry of Science and Technology of China (Grant No. 2011DFA12220), the Major Research Plan of National Natural Science Foundation of China (Grant No. 91123030), the Natural Science Foundation of Shaanxi Province of China (Grant No. 14JS106) and the Natural Science Basic Research Program of Shaanxi Province—Major Basic Research Project (2016ZDJC-15, S2018-ZC-TD-0061).
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