为提高活性炭活化过硫酸盐处理有机废水的效率，采用浸渍－ 高温煅烧法制备负载型镍/颗粒活性炭( Ni /GAC) 催化剂，采用SEM、FT-IR 和XPS 对催化剂进行分析，考察了硫酸盐投加量c( PDS) 、Ni /GAC 投加量m( Ni /GAC) 和pH 值对Ni /GAC 活化过硫酸钠( PDS) 降解酸性橙7( AO7) 的影响，并验证了反应体系内存在的主要氧化物种． 结果显示: 活性炭表面负载物为NiO，同时新增大量羧基、内酯基和酚羟基，Ni /GAC 具有较高的催化活性; AO7 去除率随c( PDS) 的增加先上升后下降; 催化作用随m( Ni /GAC) 的增大而提高; 不同pH 值下的催化降解效率为: 中性＞ 碱性＞ 弱酸性＞ 强酸性; 在最佳反应条件( 即c( PDS) = 2mmol /L、m( Ni /GAC) = 2 g、pH = 7) 下，90min 内AO7 去除率达93． 9%． 该催化体系为羟基自由基( HO·) 和硫酸根自由基( SO₄^- ·) 主导的氧化体系．

In order to improve the efficiency of the activated carbon-activated persulfate process for organic wastewater,Ni /GAC catalyst was prepared by loading nickel on granular activated carbon ( GAC) via an impregnation- calcination process.Then,the catalyst was characterized by means of SEM,FT-IR and XPS,and the effects of sodium persulfate ( PDS) dosage,Ni /GAC dosage and pH value on the degradation of acid orange 7 ( AO7) by PDS activated with Ni /GAC were investigated.Finally,some main oxide radical species existing in the reaction system were discussed.The results show that ( 1) after the impregnation-calcination process,the Ni specie loading on the catalyst is NiO,and there are much more carboxyl,lactone and phenolic hydroxyl groups on Ni /GAC catalyst surface,so that the catalyst is of high catalytic activity; ( 2) with the increase of PDS dosage,the removal of AO7 first increases and then decreases; ( 3) the catalytic degradation effect on AO7 increases with the increase in Ni /GAC dosage; ( 4) the catalytic degradation efficiency decreases when the pH value changes from neutral to alkaline and then to acidic; and ( 5) in the optimal reaction conditions,namely,a PDS dosage of 2 mmol /L,a Ni / GAC dosage of 2 g and a pH value of 7,93.9% of AO7 can be removed in 90 min.In addition,it is found that hydroxyl radical ( HO·) and sulfate radical ( SO₄^- ·) are two main oxidizing substances of the catalytic system.