水凝胶负载BiOI活化过一硫酸盐降解尼泊金甲酯

Activation of peroxymonosulfate by hydrogel supported BiOI for methylparaben degradation

以辐射聚合法合成的水凝胶为载体,采用化学沉淀法制备水凝胶基碘氧化铋复合光催化剂(p(HEA-APTMACl)-BiOI).应用扫描电子显微镜(SEM),X射线能谱仪(EDS)和X射线粉末衍射仪(XRD)对材料进行表征,结果显示,BiOI成功负载于水凝胶上.p(HEA-APTMACl)-BiOI活化过一硫酸盐(PMS)于可见光下可有效降解尼泊金甲酯(MP).探究氧化剂投加量、BiOI负载量、MP初始浓度等因素对MP降解效率的影响,结果表明,p(HEA-APTMACl)、BiOI与PMS存在协同作用,且在MP初始浓度为0.328mmol/L,PMS浓度为1.5mmol/L,催化剂投加量为0.1g条件下,2h内MP去除率高达99%.Cl-对MP降解速率有促进作用,SO4^ 2-则相反,且HCO3-会抑制MP降解效率,NO3-和H2PO4-对MP降解影响较小.

P(HEA-APTMACl)-BiOI was prepared by chemical precipitation method and the hydrogel synthesized by radiation polymerization was used as catalyst carriers.The catalyst was characterized by scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS)and X-ray diffraction(XRD).These results showed that BiOI was successfully loaded on the hydrogel.The p(HEA-APTMACl)-BiOI/peroxymonosulfate(PMS)presented high methylparaben(MP)degradation efficiency under visible light,and the effects of several operating parameters(PMS dosage,BiOI loadings and initial MP concentration)on the MP degradation efficiency were also explored.The results demonstrated that there was a synergistic effect between p(HEA-APTMACl),BiOI and PMS.In addition,the MP(0.328mmol/L)degradation efficiency reached 99%within 2h when PMS concentration was 1.5mmol/L and the catalyst dosage was 0.1g.The addition of Cl^-accelerated the degradation rate of MP,while the SO4^ 2-lead to hysteresis in MP degradation.Moreover,the MP degradation efficiency was reduced by the presence of HCO3,but it was little influenced by NO3-and H2PO4.