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利用羟胺(HA)强化Fe(Ⅱ)/过一硫酸盐(PMS)体系处理对氯苯酚(4-CP)溶液,考察了HA浓度、Fe(Ⅱ)浓度、PMS浓度和pH等对该体系降解4-CP效能的影响.结果表明:在反应时间为10 min,Fe(Ⅱ)浓度为5.0 μmol/L,PMS浓度为0.4mmol/L和pH为3.0的条件下,0.2 mmol/L HA可将4-CP的去除率从6.77％提高到89.67％;该体系的降解效能与HA浓度、Fe(Ⅱ)浓度和PMS浓度成正比;较低的Fe(Ⅱ)浓度即可快速、持续地降解4-CP;最佳摩尔比n(HA)∶n(PMS)为1∶1,最佳pH为3.0～5.0;通过投加自由基专属捕获剂甲醇和叔丁醇,判定硫酸根自由基(SO4-)为该体系主要的活性物种.“,”Hydroxylamine (HA) is employed to assist Fe(Ⅱ)/peroxymonosulfate (PMS) system to treat with pchlorophenol (4-CP) solution.The effects of HA concentration,Fe(Ⅱ) concentration,PMS concentration and pH value on the removal rate of 4-CP by this system are explored.It is found that under the reaction conditions:l0 min for reaction time,5.0 μmol· L-1 for Fe (Ⅱ) concentration,0.4 mmol· L-1 for PMS concentration and pH =3.0,the 4-CP degradation efficiency can be increased from 6.77％ to 89.67％ via the addition of 0.2 mmol · L 1 HA.The 4-CP degradation efficiency by HA/Fe(Ⅱ)/PMS system is proportional to the concentration of HA,Fe(Ⅱ) and PMS.A very low dosage of Fe(Ⅱ) is sufficient to cause 4-CP to degrade rapidly and sustainably by HA/Fe(Ⅱ)/PMS system.The optimal molar ratio between HA and PMS is 1 ∶ 1,and the optimal pH is in the range of 3.0 to 5.0.Sulfate radical (SO4-) is distinguished as the major reactive species in this system by addition of radical trapping agent methanol and ten-butyl alcohol.