GO/PDMS-PU海绵负载Fe_(3)O_(4)活化过硫酸盐去除地下水石油烃的研究

Removal of petroleum hydrocarbons from groundwater by GO/PDMS-PU sponge loaded Fe_(3)O_(4)activated persulfate

针对石油烃(TPH)在土壤中长时间不易分解造成地下水长久污染问题,研究了新型复合石墨烯海绵(GO/PDMS-PU)负载Fe_(3)O_(4)活化过硫酸盐体系在不同催化剂质量比、初始pH、过硫酸盐(PS)浓度、TPH浓度以及共存阴离子等条件下降解TPH的规律。结果表明,Fe_(3)O_(4)与GO/PDMS-PU的质量比为1∶2的复合材料降解效率最佳,为88%。当PS浓度为2 mmol/L、催化剂质量浓度为0.3 g/L时,在酸性和中性条件下更有利于TPH的去除,去除效率为85%。GO/PDMS-PU/Fe_(3)O_(4)+PS体系的自由基猝灭实验和EPR测试表明,自由基以·SO_(4)^(-)、·OH为主,存在一定量1O_(2)。

Petroleum hydrocarbons,as a widely used raw material worldwide,are not easily decomposed in soil for a long time and can easily cause long-term pollution of surface water and groundwater.The degradation behavior of petroleum hydrocarbons by a novel composite graphene sponge loaded Fe_(3)O_(4)(GO/PDMS-PU/Fe_(3)O_(4))activated persulfate system activated persulfate system is explored under different catalyst mass ratio,initial pH,persulfate concentration,petroleum hydrocarbons concentration,and coexisting anions.It is found that the composite material with a Fe_(3)O_(4)to GO/PDMS-PU mass ratio of 1∶2 delivers the optimal degradation efficiency of 88%.The acidic and neutral conditions are more favorable for removal of petroleum hydrocarbons,achieving a removal efficiency of 85%when persulfate dosage is 1 mM and catalyst dosage is 0.3 g·L^(-1).It is shown by the free radical quenching experiment and EPR test of GO/PDMS-PU/Fe_(3)O_(4)+PS system that·SO_(4)^(-) and·OH are the main free radicals,and there exists a certain amount of 1O2.