Ag3PO4-MnO2/g-C3N4非均相臭氧催化对页岩气钻井废水的深度处理

采用热缩聚合成法、水热法制备Ag3PO4-MnO2/g-C3N4三元复合催化剂。利用XRD和SEM对其进行结构表征，并考察催化剂用量、废水pH、臭氧投加量等因素对页岩气钻井废水深度处理效果的影响。结果表明，Ag3PO4-MnO2/g-C3N4三元复合催化剂中，立方晶型Ag3PO4、纳米纤维状MnO2与经模板剂制得的管孔状g-C3N4成功复合，改变了其晶面的有序性并增大了比表面积。通过复合提高了Ag3PO4的稳定性及其与MnO2协同作用对臭氧的催化活性。在催化剂投加量为0.5 g·L-1，废水pH为11，臭氧投加量为3.2 mg·min-1，反应时间为40 min的条件下，对预处理后的页岩气钻井废水（COD含量为1 076 mg·L-1）COD的去除率为85.1%，该复合催化剂重复使用5次后仍保持良好的活性和稳定性。

Advanced treatment of shale gas drilling wastewater by heterogeneous ozone catalysis of Ag3PO4-MnO2/g-C3N4

The ternary catalyst Ag3PO4-MnO2/g-C3N4 was prepared by thermal polycondesation and hydrothermal synthesis. XRD and SEM investigated the structure characterization of the catalyst. The effects of catalyst dosage, pH of wastewater and ozone dosage on the advanced treatment of shale gas drilling wastewater were investigated. The results showed that the cubic crystal Ag3PO4 and the nano-fibri form of MnO2 were successfully attached to the tubular g-C3N4 prepared by the templates, which changed the orderliness of crystal surface and increased surface area of the catalyst. The stability of Ag3PO4 and the synergistic effect with MnO2 on the catalytic activity of ozone were improved. When the catalyst dosage was 0.5 g·L-1, pH 9.5 and the ozone dosage was 3.2 mg·min-1, the corresponding COD removing rate of pretreatment wastewater was 85.1% after 40 min reaction (the initial COD of wastewater was 1 076 mg·L-1), after 5 times used repeatedly, the catalyst still had good activity and stability.