纳米铜复合焦脱除含硝基苯废水的研究

Study on the Removal of Nitrobenzene-Containing Wastewater by Nano-Copper Composite Coke

采用焦炭作载体,通过KBH4还原法制备了纳米铜复合焦催化剂,并进行了催化剂制备和硝基苯脱除工艺的研究以及催化剂的表征。结果表明,KOH预处理焦有利于丰富焦的中孔。当KBH4还原等含量的CuSO4溶液时,1~3 nm的Cu和Cu_(2)O负载在焦的中孔表面,形成纳米Cu_(2)O/Cu复合焦催化剂。当pH为6时,吸附时间大于6.5 h时,硝基苯脱除率可达100%。硝基苯的质量浓度为10 mg/L时,最大饱和吸附量0.100 2 mg/g。纳米铜焦脱除水中硝基苯的过程是它被焦吸附和被大量Cu_(2)O/Cu微电池催化降解共同作用的结果。纳米铜焦吸附硝基苯符合Freundlich等温过程和准2级动力学过程。

Using coke as a carrier,a nano-copper composite coke catalyst was prepared by KBH4 reduction method,and the catalyst preparation,nitrobenzene removal process and catalyst characterization were studied.The results showed that KOH pretreatment of coke was beneficial to enrich the mesopores of coke.When CuSO4 was reduced by the KHB4 solution of equal content,1~3 nm Cu and Cu_(2)O were loaded on the mesoporous surface of the coke to form a nano Cu_(2)O/Cu composite coke catalyst.When the pH was 6,the adsorption time was greater than 6.5 h,the removal rate of nitrobenzene could reached 100%.When the mass concentration of nitrobenzene was 10 mg/L,the maximum saturated adsorption capacity of catalyst was 0.100 2 mg/g.The process of removing nitrobenzene from water by the nano copper composite coke was the result of its adsorption by coke and the catalytic degradation of a large number of Cu_(2)O/Cu micro-batteries.The adsorption of nitrobenzene on the nano-copper coke conformed to the Freundlich isothermal process and the pseudo-second order kinetic process.