Liao Zhuwei, Zhu Jingyi, Jawad Ali, Muzi Jiajing, Chen Zhuqi, Chen Zhulei
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
GAD Environmental Co., Ltd., Shenzhen 518067, China.
Materials (Basel). 2019 Mar 23;12(6):968. doi: 10.3390/ma12060968.
In this study, we report on an active and stable CoMgAl layered double hydrotalcite (LDH) catalyst for phenol degradation by heterogeneous activation of peroxymonosulfate (PMS). The CoMgAl-LDH catalyst was synthesized by hydrothermal method. The PMS/CoMgAl-LDH system overcomes the drawbacks of traditional Fenton processes. Various effects, e.g., scavengers, chloride ion, catalyst dosage, PMS concentration, temperature, and pH, were also inspected to evaluate the system. The results indicated that the PMS/CoMgAl-LDH system had extremely high efficiency for phenol degradation; 0.1 mM phenol could be completely degraded by 0.3 g/L catalyst and 3 mM PMS within 60 min at 30 °C. The CoMgAl-LDH catalyst appeared to possess outstanding reusability and stability. After four rounds of recycling, nearly 100% of the phenol was removed within 80 min by the PMS/CoMgAl-LDH system, with only 0.05 mg/L Co leaching. A sulfate radical was the main oxidation species in the PMS/Co-LDH system. The degradation rate of phenol was influenced by temperature, and the activation energy was 65.19 kJ/mol. These advantages proved the PMS/CoMgAl-LDH system is an effective strategy for the treatment of organic contaminants.
在本研究中，我们报道了一种用于通过过一硫酸盐（PMS）的非均相活化降解苯酚的活性且稳定的CoMgAl层状双氢氧化物（LDH）催化剂。CoMgAl-LDH催化剂通过水热法合成。PMS/CoMgAl-LDH体系克服了传统芬顿工艺的缺点。还考察了各种因素，如清除剂、氯离子、催化剂用量、PMS浓度、温度和pH值，以评估该体系。结果表明，PMS/CoMgAl-LDH体系对苯酚降解具有极高的效率；在30℃下，0.3 g/L催化剂和3 mM PMS可在60分钟内将0.1 mM苯酚完全降解。CoMgAl-LDH催化剂表现出出色的可重复使用性和稳定性。经过四轮循环后，PMS/CoMgAl-LDH体系在80分钟内可去除近100%的苯酚，钴浸出量仅为0.05 mg/L。硫酸根自由基是PMS/Co-LDH体系中的主要氧化物种。苯酚的降解速率受温度影响，活化能为65.19 kJ/mol。这些优点证明PMS/CoMgAl-LDH体系是处理有机污染物的有效策略。
