MnFe_(2)O_(4)/AC活化过硫酸盐去除水中双酚A的性能研究

Study on removal of bisphenol A from water by MnFe_(2)O_(4)/AC activated persulfate

采用水热合成法制备了活性炭负载的铁锰氧化物(MnFe_(2)O_(4)/AC),并将其用于活化过二硫酸盐(PDS)对水中双酚A(BPA)进行降解。研究了PDS浓度、MnFe_(2)O_(4)/AC投加量以及初始pH对BPA降解效率的影响,结果表明,在一定范围内,BPA的降解率随PDS浓度以及MnFe_(2)O_(4)/AC投加量的增大而升高,在PDS浓度为1.0 mmol/L、MnFe_(2)O_(4)/AC投加质量浓度为5 mg/L时BPA降解效率趋于稳定;初始pH为5时,BPA降解率最高,且在pH为3~9内BPA均能有效被去除。无机阴离子实验表明,CO_(3)^(2-)对该体系降解BPA的抑制作用较为明显,而Cl^(-)和SO_(4)^(2-)造成的影响较小。自由基淬灭实验得知,·SO_(4)^(-)和·OH都是体系内发挥作用的活性物质,其中·SO_(4)^(-)是主要活性物质,证明了MnFe_(2)O_(4)/AC活化PDS降解BPA的有效性。

Activated carbon supported iron manganese oxide(MnFe_(2)O_(4)/AC)is prepared through hydrothermal synthesis method,and used to activate perdisulfate(PDS)to efficiently degrade bisphenol A(BPA)in water.The influences of PDS concentration,MnFe_(2)O_(4)/AC dosage and initial pH on the degradation efficiency of BPA are studied.It is shown by the results that in a certain range,the degradation rate of BPA increases with the increases of PDS concentration and MnFe_(2)O_(4)/AC dosage.BPA degradation rate tends to be stable when PDS concentration is 1.0 mM and MnFe_(2)O_(4)/AC dosage is 5 mg·L^(-1).BPA degradation rate reaches the highest when the initial pH value is 5.In addition,BPA can be effectively removed in pH values of 3-9.It is indicated by inorganic anion experiment that CO_(3)^(2-)significantly inhibits the degradation of BPA in this system,while Cl^(-)and SCO_(4)^(2-)have little effect.According to the free radical quenching experiment,·SO_(4)^(-)and·OH are both active substances that play a role in this system,of which·SO_(4)^(-)is the main active substance.This study demonstrates the effectiveness of MnFe_(2)O_(4)/AC activated PDS in degrading BPA.