铁碳微电解填料（Fe/C-MEF）活化过硫酸盐降解活性黑5

doi:10.16085/j.issn.1000-6613.2020-0183

摘要/Abstract

摘要：

采用高温微孔活化技术制备了铁碳微电解填料（Fe/C-MEF），用于活化过硫酸盐（PDS）降解高浓度活性黑5（RB5）染料废水。使用扫描电镜和能谱仪对Fe/C-MEF进行了表征。对比了不同工艺对RB5的降解性能，结果表明Fe/C-MEF/PDS体系表现出更加高效的去除率，且Fe/C-MEF反应前后结构稳定易回收重复利用。探究了PDS浓度、Fe/C-MEF浓度、pH、无机阴离子对体系降解RB5的影响，得到优化的反应条件，PDS浓度、Fe/C-MEF浓度分别为1.5×10^-2mol/L、24g/L；表明PDS水解能调节pH至3附近，使体系保持较高的去除率；无机阴离子的存在会影响体系对RB5的降解，且根本原因为影响体系pH限制催化剂释放和消耗·SO $4 -$ 生成更低活性的自由基。自由基淬灭实验表明，在反应中Fe/C-MEF同时作为微电解反应主体和PDS的非均相催化剂，在两者协同作用下高效降解RB5。Fe/C-MEF经过6次循环利用，体系对RB5依然保持高的脱色率，具有很好的稳定性。

关键词: 微电解, 催化剂, 活化, 过硫酸盐, 染料废水, 自由基

Abstract:

The iron-carbon micro-electrolytic filler (Fe/C-MEF) was prepared using high-temperature microporous activation technology, which was used to activate persulfate (PDS) to degrade high-strength Reactive Black 5 (RB5) dye wastewater. Fe/C-MEF was characterized by scanning electron microscopy (SEM) and energy spectrometer (EDS). After comparing the degradation of RB5 by different processes, the results showed that the Fe/C-MEF/PDS system performed a more efficient removal rate, and the Fe/C-MEF structure was stable and easy to recycle. The effects of PDS concentration, Fe/C-MEF concentration, pH and inorganic anions on the degradation of RB5 were investigated. Appropriate PDS concentration and Fe/C-MEF concentration were 1.5×10^-2mol/L and 24g/L, respectively. It suggested that the hydrolysis of PDS can adjust the pH to around 3, so that the system can maintain a high removal rate. The existence of inorganic anions will affect the degradation of RB5, and the fundamental reason was that it affected the pH of the system to limit the release of catalyst and the consumption of ·SO $4 -$ to generate lower active free radicals. Free radical quenching experiments issued that Fe/C-MEF acted as both a microelectrolytic reactant and a heterogeneous catalyst for PDS in the reaction. After 6 cycles of Fe/C-MEF recycling, the system still maintained a high removal rate for RB5, indicating that Fe/C-MEF had good stability.

Key words: micro-electrolytic, catalyst, activation, persulfate, dye wastewater, radical

中图分类号:

张鹏, 成先雄, 连军锋, 陈于梁, 王磊. 铁碳微电解填料（Fe/C-MEF）活化过硫酸盐降解活性黑5[J]. 化工进展, 2020, 39(11): 4708-4716.

Peng ZHANG, Xianxiong CHENG, Junfeng LIAN, Yuliang CHEN, Lei WANG. Iron-carbon micro-electrolytic filler (Fe/C-MEF) activated persulfate degradation Reactive Black 5[J]. Chemical Industry and Engineering Progress, 2020, 39(11): 4708-4716.

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