硝基苯酚类的快速吸附与降解

以对硝基苯酚(PNP)和邻硝基苯酚(ONP)为主要研究对象,采用粉末活性炭和Fenton试剂快速吸附与降解PNP和ONP溶液,使其浓度降至生活饮用水准许浓度(分别为0.02 mg/L和0.06 mg/L)以下,并比较2种物质的处理效果,为硝基苯酚的水体污染治理和废水处理中的深度降解提供依据。结果表明,用粉末活性炭吸附浓度为1 mg/L和4 mg/L的PNP溶液60 min后,浓度低于0.02 mg/L,长时间跟踪监测,污染物浓度仍控制在0.02 mg/L以下,在pH<6时,粉末活性炭吸附PNP的效果较好;用Fenton试剂处理浓度为10 mg/L的PNP溶液70 min后,可完全降解PNP。粉末活性炭吸附12 mg/L的ONP溶液时,效率高于吸附PNP;Fenton试剂处理浓度为12 mg/L的ONP时,与PNP的处理效果相当。

Rapid adsorption and degradation of nitrophenol solution with activated carbon and Fenton＇s reagent

The powdered activated carbon(PAC) adsorption and Fenton’s reagent degradation of nitrophenol solutions were studied to provide a technical basis for polluted water treatment and depth degradation of wastewater.Laboratory adsorption isotherms runs were performed to determine the feasibility of PAC adsorption for rapid removing p-nitrophenol and o-nitrophenol respectively,which satisfies with the concentration standards for surface water environment quality of 0.02 mg/L and 0.06 mg/L.Then Fenton’s reagent was also systematically studied.In addition,the comparison of removal of p-nitrophenol and o-nitrophenol was also investigated.The results show that the residuum of p-nitrophenol can be decreased to below 0.02 mg/L after PAC absorbing p-nitrophenol for 60 min.The better absorption effect is found at the lower initial pH value(<6);Fenton’s reagent can completely oxidize p-nitrophenol in 70 min.PAC has a better removal efficiency of o-nitrophenol than p-nitrophenol,while Fenton’s reagent shows the similar efficiency.