掺铜介孔碳活化过硫酸氢盐高效降解双酚A

Activation of peroxymonosulfate by copper doped ordered mesoporous carbon for efficient destruction of bisphenol A

采用蒸发诱导自组装的方法制备了掺铜有序介孔碳复合催化剂(Cu-OMC),开展了Cu-OMC活化过硫酸氢钾(PMS)氧化降解双酚A研究.研究结果显示,Cu-OMC可高效活化PMS进而有效降解双酚A,在催化剂投加量0.1g/L、PMS浓度0.5mmol/L的反应条件下,60min内对20mg/L的双酚A去除率可达91%.在pH=3~11范围内,双酚A均可有效降解,阴离子(Cl-、SO_4^(2-)、HCO_3^-和PO_4^(3-))的存在对双酚A降解影响较小.利用自由基猝灭实验和电子顺磁共振(EPR)对反应过程中产生的活性氧自由基(ROS)进行了分析,结果表明除了硫酸根自由基(SO4·-)和羟基自由基(·OH),单线态氧(~1O_2)在双酚A的降解过程中起着重要作用.

Copper doped ordered mesoporous carbon(Cu-OMC) was prepared by evaporation induced self-assembly and presented high catalytic activity for the activation of peroxymonosulfate(PMS). At the condition of catalyst dosage 0.1 g/L, PMS concentration 0.5 mmol/L, the removal of 20 mg/L bisphenol A(BPA) could be achieved 91% in 60 min.The reaction can be performed under a wide pH range around 3-11 and little influenced by anions including Cl-, SO_4^(2-), HCO_3^- and PO_4^(3-). The reactive oxygen species(ROS) generated during the reaction process were analyzed by radical quenching tests and electron spin response(EPR). It was found that apart from sulfate radical(SO4·-) and hydroxyl radicals(×OH), singlet oxygen(~1O_2) also contributed to the degradation of BPA.