Fe(Ⅱ)-H2O2不同温度浸润改性活性炭是采用FeSO4·7H2O添加H2O2在温度100℃下纯浸润24 h（Fe(Ⅱ)-24 h)和高温蒸发15 min（Fe(Ⅱ)-15 min)制备.对2类材料进行SEM表征并对其吸附1.1 mg/L砷(V)的性能进行比较.SEM显示Fe(Ⅱ)(0.485%)-24 h（0.485%为Fe(Ⅱ)-24 h的铁含量,下同）表面覆盖厚的棒状纳米羟基铁，Fe(Ⅱ)(1.35%)-15 min表面覆盖薄而烧结扭曲羟基铁；高温蒸发15 min有利于铁负载；Fe(Ⅱ)-24 h（108~142 mg/gFe）对砷(V)吸附的铁效率是Fe(Ⅱ)-15 min（57~63 mg/gFe）的2倍；Fe(Ⅱ)(0.485%)-24 h在2H<3.5或9H<12时对砷(V)的吸附平衡容量高于Fe(Ⅱ)(1.35%)-15 min，同时Fe(Ⅱ)(0.485%)-24 h在不同pH值的条件下铁的溶出量低于Fe(Ⅱ)(1.35%)-15 min；SO42-、NO3-、ClO4-、PO43-抑制Fe(Ⅱ)(0.485%)-24 h对砷(V)的去除，PO43-抑制效果更为明显，Cl-（100 mg/L）和BrO3-促进其对砷(V)的去除.%Granular activated carbon (GAC) modified by Fe(Ⅱ)-H2O2 incipient wetness impregnation at different temperatures are prepared by FeSO4·7H2O and hydrogen peroxide (H2O2) via the incipient wetness for 24 h at 100℃(Fe(Ⅱ)-24 h ) and the high temperature evaporation for 15 min (Fe(Ⅱ)-15 min).Fe(Ⅱ)-24 h and Fe(Ⅱ)-15 min are characterized by SEM and are compared for the adsorption behavior of the arsenate (1.1 mg/L).The SEM has shown that nano-iron hydroxides are formed on the surface of Fe (Ⅱ)(0.485 %)-24 h (0.485 % is the iron content of Fe (Ⅱ)-24 h,the same below) and that sintering distorted hydroxides are formed on the surface of Fe (Ⅱ)(1.35 %)-15 min.The high temperature evaporation for 15 min is favorable for iron to load on GAC. The iron use efficiency of Fe(Ⅱ)-24 h(108~142 mg/gFe) is two fold of that of Fe(Ⅱ)-15 min(57~63 mg/gFe).The arsenate equilibrium adsorption capacity of Fe(Ⅱ) (0.485 %)-24 h is better than the Fe(Ⅱ)(1.35 %)-15 min at pH 2~3.5 or 9~12,at the same time,the soluble iron at any particular pH released from the Fe(Ⅱ)(0.485 %)-24 h is less than that released from the Fe (Ⅱ)(1.35 %)-15 min.The presence of SO42-, NO3-, ClO4-, or PO43-inhibit the adsorption of arsenate, especially for phosphate,while the existence of Cl-(100 mg/L)and BrO3-promote the adsorption of arsenate.
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