摘要
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;
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 at100 ℃（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.
出处
《有色金属科学与工程》
CAS
2014年第4期66-70,共5页
Nonferrous Metals Science and Engineering
基金
国家自然科学基金资助项目(51208364
51178321)
