Cu-Fe@C复合材料的制备及其光芬顿催化降解硝基苯研究

Preparation of Cu-Fe@C composite and study on its application in photo-Fenton catalytic degradation of nitrobenzene

采用机械活化法对前驱体物料进行预处理,使纤维素和金属盐通过相互作用力稳定结合,经一步煅烧法得到结构稳定的纤维素基炭负载铜-铁复合材料Cu-Fe@C,将该复合材料用于光芬顿催化降解硝基苯。利用XRD、FESEM、FT-IR、XPS等对复合材料的结构性质进行表征,并探究了硝基苯初始质量浓度、溶液初始pH、催化剂质量浓度、H_(2)O_(2)浓度对催化性能的影响。结果表明,在初始质量浓度为50 mg/L、溶液初始pH 7、催化剂质量浓度为0.5 g/L、H_(2)O_(2)浓度为64 mmol/L的最佳反应条件下,硝基苯的降解率达91.1%,降解副产物为苯胺,有利于进一步被矿化。复合材料催化剂循环使用5次后,硝基苯的降解率仍在86%以上。

Precursor materials are pretreated by mechanical activation method to make cellulose and metal salt bond stably via interaction force.A stable cellulose-based carbon copper-iron composite(Cu-Fe@C)is obtained by one-step calcination of the treated precursor,and used as catalyst for photo-Fenton catalytic degradation of nitrobenzene.The structural properties of the composite are characterized by XRD,FESEM,FTIR,and XPS.The effects of initial concentration of nitrobenzene,initial pH of solution,catalyst dosage,and H_(2)O_(2) concentration on the catalytic performance of the composite are also investigated.It is shown that the degradation rate of nitrobenzene reaches 91.1%under the optimum reaction conditions as follows:the initial concentration of nitrobenzene is 50 mg·L^(-1),the initial pH of the solution is 7,catalyst dosage is 0.5 g·L^(-1),and H_(2)O_(2) concentration is 64 mM.Aniline is main degradation byproduct,which is conducive to further mineralization.After the catalyst has been used for 5 cycles,the degradation rate of nitrobenzene is still above 86%.