Catalytic Oxidation of Dyeing Wastewater by Copper Oxide Activating Persulfate: Performance, Mechanism and Application
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RESEARCH PAPER
Catalytic Oxidation of Dyeing Wastewater by Copper Oxide Activating Persulfate: Performance, Mechanism and Application Yuxuan Ye1,2 · Jun Wan1,2 · Qiang Li1,2 · Yangbo Huang1,2 · Fei Pan1,2 · Dongsheng Xia1,2 Received: 24 July 2020 / Revised: 28 September 2020 / Accepted: 19 October 2020 © University of Tehran 2020
Abstract The effective treatment of dyeing wastewater has been considered as one of the challenges. The sulfate radical (SO4•−)-based technology exhibited great potential in the field of organic wastewater treatment. In this study, copper oxide was synthesized and used to activate persulfate (PS) for removing methylene blue (MB) from aqueous solution. The effects of reaction parameters and coexisting substances on this process were studied. Under the optimal conditions ([CuO] = 0.2 g/L, [PS] = 2 g/L, pH = 7.0–9.0), more than 90% of MB was degraded. C l− had little effect on MB removal, while S O42− and H CO3− showed inhibitory effect. The activation energy of the reaction was 137.8 kJ/mol at 25 ℃ with an initial MB concentration of 10 mg/L. The mechanisms of PS activated by CuO was elucidated by radical scavenger and electron spin resonance trapping studies. The results found that sulfate radical (SO4·−) and singlet oxygen (1O2) were the primary reactive oxygen species in the CuO/ PS system. The recycling experiments showed that MB removal efficiency remained more than 70% after five cycles, which exhibited good stability and high efficiency of the catalyst. The favorable degradation performance of simulated textile wastewater indicated the potential application of CuO/PS for dyeing wastewater treatment. Article Highlights • • • •
CuO prepared by hydrothermal method can effectively activate PS to degraded MB. The optimal degradation conditions was [CuO] = 0.2 g/L, [PS] = 2 g/L, pH = 7.0–9.0. SO4·− and 1O2 were the primary reactive species in the CuO/PS system. MB removal efficiency remained more than 70% after 5 cycles.
Keywords Catalytic oxidation · Copper oxide · Persulfate · Dyeing wastewater · Mechanism
Introduction Yuxuan Ye and Jun Wan contributed equally to this work and were the co-first authors. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s41742-020-00296-9) contains supplementary material, which is available to authorized users. * Qiang Li [email protected] * Dongsheng Xia [email protected] 1
School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, People’s Republic of China
Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430073, People’s Republic of China
2
The dyeing industry is one of the seriously water-polluted industries in China. The amount of wastewater generated from such industry is relatively large, and most of the dye in the wastewater is toxic, carcinogenic and hard to be biodegraded (Feng et al. 2012; Li et al. 2019). If dyeing wastewater is discharged without proper treatment, it will bring seriou
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