摘要
本文研制了一种新型除砷吸附剂,即基于稀土金属铈的无机铈铁吸附剂,并对该吸附剂的除砷效果进行了评价．活性氧化铝和新型研制的铈铁吸附剂对Ａｓ(Ⅴ)吸附平衡比较实验结果表明:活性氧化铝除砷的最佳 ｐＨ为 ３．５－５．５,最大吸附量为８６ｍｇ Ａｓ(Ⅴ)·ｇ－１;而铈铁吸附剂的ｐＨ适用范围广,在ｐＨ３－７的范围内具有较高的除砷性能,最大吸附量可达１６．０ｍｇＡｓ(Ⅴ)·ｇ－１,该吸附材料对Ａｓ(Ⅴ)的吸附基本符合Ｆｒｅｕｎｄｌｉｃｈ型等温方程式,硬度、盐度和氟离子不干扰吸附过程,但磷酸根离子干扰材料对Ａｓ(Ⅴ)的吸附、铈铁无机吸附材料在饮水除砷中具有比较大的应用前景．
A rare earth metal based inorganic adsorbent, cerium-iron adsorbent, developed, and its per-formance for arsenic removal was evaluated. The performance of the inorganic adsorbent for arsenic ( Ⅴ ) removal was compared with that of activated alumina, a conventional adsorbent for arsenic (Ⅴ ) removal. Experimental results show that the capacity of rare earth metal based absorbent was almost constant around a value of 16.0mg As (Ⅴ)·g-1 over a wide pH range of 3?, while the maximum adsorption capacity of activated alumina of 8.6mg As (Ⅴ)·g-1 was obtained in a much narrower pH range of 3.5 to 5.5. The results shows that the adsorption of As (Ⅴ) on Ce-Fe ad-sorption follows Freundlich isotherm in the tested range of As concentrations. Salinity, hardness and fluoride didn't interfere with the adsorption of As, but phosphate inhibited the removal of As seri-ously . The above results demonstrate the effectiveness of the new adsorbent for arsenic removal.
出处
《环境化学》
CAS
CSCD
北大核心
2001年第1期70-75,共6页
Environmental Chemistry
基金
本课题受日中技术交流荏原基金
中国科学院百人计划经费资助
