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Catalytic Oxidation of Dyeing Wastewater by Copper Oxide Activating Persulfate: Performance, Mechanism and Application
International Journal of Environmental Research ( IF 3.2 ) Pub Date : 2020-10-31 , DOI: 10.1007/s41742-020-00296-9
Yuxuan Ye , Jun Wan , Qiang Li , Yangbo Huang , Fei Pan , Dongsheng Xia

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. Cl− had little effect on MB removal, while SO42− and HCO3− 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. 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. 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.

中文翻译:

氧化铜活化过硫酸盐催化氧化印染废水的性能、机理及应用

印染废水的有效处理一直被认为是挑战之一。基于硫酸根(SO4•−)的技术在有机废水处理领域展现出巨大的潜力。在这项研究中,氧化铜被合成并用于活化过硫酸盐 (PS),以从水溶液中去除亚甲蓝 (MB)。研究了反应参数和共存物质对该过程的影响。在最佳条件下([CuO] = 0.2 g/L,[PS] = 2 g/L,pH = 7.0–9.0),超过 90% 的 MB 被降解。Cl− 对 MB 去除几乎没有影响,而 SO42− 和 HCO3− 显示出抑制作用。25 ℃下反应活化能为137.8 kJ/mol,初始MB浓度为10 mg/L。通过自由基清除剂和电子自旋共振捕获研究阐明了 CuO 激活 PS 的机制。结果发现硫酸根 (SO4·-) 和单线态氧 (1O2) 是 CuO/PS 系统中的主要活性氧物种。循环实验表明,5次循环后MB去除率仍保持在70%以上,表现出催化剂稳定性好、效率高的特点。模拟纺织废水的良好降解性能表明了 CuO/PS 在印染废水处理中的潜在应用。水热法制备的CuO可有效活化PS降解MB。最佳降解条件为 [CuO] = 0.2 g/L,[PS] = 2 g/L,pH = 7.0–9.0。SO4·- 和 1O2 是 CuO/PS 系统中的主要反应物质。MB 去除率在 5 个循环后仍保持在 70% 以上。水热法制备的CuO可有效活化PS降解MB。最佳降解条件为 [CuO] = 0.2 g/L,[PS] = 2 g/L,pH = 7.0–9.0。SO4·- 和 1O2 是 CuO/PS 系统中的主要反应物质。MB 去除率在 5 个循环后仍保持在 70% 以上。
更新日期:2020-10-31
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