铈镍掺杂OMS-2催化剂的合成、表征及其催化臭氧降解草酸的性能研究

Synthesis,characterization and catalytic ozonation performance of cerium-nickel co-doped OMS-2 catalyst for oxalic acid degradation

通过水热合成和沉积沉淀法合成了一系列双金属Ce和Ni掺杂OMS-2(Ce/Ni-OMS-2)催化剂,并将其应用于催化臭氧氧化去除草酸(OA)的研究。系统地考察了掺杂比、催化剂投加量、OA浓度、初始pH值对Ce/Ni-OMS-2催化臭氧降解草酸的影响,其中双金属掺杂催化剂Ce/Ni-OMS-2(1∶5)在反应30 min后,OA的降解率达到了100%。通过多种表征手段对催化材料的理化性质进行了全面探讨,双金属Ce和Ni通过替换孔道中的K^(+)成功掺杂到OMS-2中,显著增加了催化剂的比表面积和低价Mn的含量。此外,氧化还原对Ce^(3+)/Ce^(4+)和Ni^(2+)/Ni^(3+)的存在,增强了电子转移能力,促进了氧空位的形成和活性氧物种的生成。因此,合成的Ce/Ni-OMS-2(1∶5)作为一种高效且稳定的催化剂,在催化臭氧氧化领域有广泛的应用潜力。

A series of bimetallic Ce and Ni doped OMS-2(Ce/Ni-OMS-2)catalysts were synthesized by hydrothermal and deposition methods,and the Ce/Ni-OMS-2 catalysts were further applied to the catalytic ozonation removal of oxalic acid(OA).The effects of Ce/Ni doping ratio,catalyst dosage,OA concentration,and initial pH value on OA degradation by Ce/Ni-OMS-2 catalytic ozonation were investigated.The degradation rate of OA by Ce/Ni-OMS-2(1∶5)reached 100%within 30 min.The physical and chemical properties of the catalysts were discussed through various characterization methods.The results revealed that the bimetallic Ce and Ni were successfully dopted into OMS-2 by replacing K^(+)in the pore channels,which could significantly increase the specific surface area and the content of low manganese.In addition,the presence of redox couples:Ce^(3+)/Ce^(4+)and Ni^(2+)/N^(3+)enhanced the electron transfer capacity,accelerated the formation of oxygen vacancy and promoted the generation of reactive oxygen species.Therefore,as a highly efficient and stable catalyst,the synthesized Ce/Ni-OMS-2(1∶5)is expected to be widely used in the field of catalytic ozonation.