钴钼水滑石活化过一硫酸盐降解O-去甲文拉法辛

Peroxymonosulfate for Degradation of O‑desmethylvenlafaxine Activated by Cobalt-Molybdenum Layered Double Hydroxide

针对日趋严峻的水环境药理活性化合物(PhAC)污染问题,采用简单的共沉淀法合成了一种新型钴钼水滑石(CoMo-LDH)非均相催化剂,用于活化过一硫酸盐(PMS)以降解水中典型PhAC污染物O-去甲文拉法辛(ODV)。利用XRD、FTIR、TEM和XPS等一系列表征方法分析了CoMo-LDH的物理化学性能,研究了CoMo-LDH/PMS体系降解ODV的效果和机理。结果表明,当PMS和CoMo-LDH的投量分别为0.1 mmol/L和0.05 g/L时,催化体系能够在15 min内将2 mg/L的ODV完全去除。催化机理研究表明,体系中的主要活性物种为SO_(4)^(-)·;Co-Mo氧化还原双循环不仅促进了催化剂活化PMS的效率,还提高了催化剂的再生回用性能。另外,利用生态毒性计算软件预测ODV的毒性变化,显示CoMo-LDH/PMS体系能够有效抑制ODV的生态毒性。

This paper synthesized a novel cobalt-molybdenum layered double hydroxide(CoMoLDH)heterogeneous catalyst by a simple co‑precipitation method to activate peroxymonosulfate(PMS)for degrading the typical pharmacologically active compound(PhAC)O‑desmethylvenlafaxine(ODV)in water,so as to solve the increasingly serious water environment pollution caused by PhAC.The physical and chemical properties of CoMo-LDH were characterized by XRD,FTIR,TEM and XPS,and the performance and mechanism of the CoMo-LDH/PMS system for degrading ODV were systematically investigated.When the dosages of PMS and CoMo-LDH were 0.1 mmol/L and 0.05 g/L,respectively,the catalytic system could completely remove 2 mg/L ODV within 15 min.The catalytic mechanism showed that the main active species in the system was sulfate radical(SO_(4)^(-)·).The Co-Mo redox cycle not only promoted the efficiency of catalyst for activating PMS,but also improved the regeneration and reuse performance of the catalyst.In addition,the toxicity change of ODV predicted by ecotoxicity calculation software showed that the CoMo-LDH/PMS system could effectively inhibit the ecotoxicity of ODV.