三种氧化铁吸附水环境中砷的试验研究  

Experimental Study on Adsorption of Arsenic in Aqueous System with Three Iron Oxides

作　　者：陈雯[1] 刘玲[1] 周建伟[2] 

机构地区：[1]中国地质大学研究生院 [2]中国地质大学环境学院,湖北武汉430074

出　　处：《环境科学与技术》2009年第1期63-67,共5页Environmental Science & Technology

摘　　要：采用两种人工合成的氧化铁(针铁矿、水铁矿)和赤铁矿作为吸附剂,对含砷(三价砷及三价五价砷混合液)水进行了吸附试验。结果表明,在初始浓度为1200μg/L的As(Ⅲ)溶液中,水铁矿的吸附效果最好,针铁矿和赤铁矿吸附效果较差;在初始pH为7,As(Ⅲ)和As(Ⅴ)摩尔比为1:1的混合液中时,三种铁矿对总砷的吸附效果均随着As/Fe摩尔比的增大而减小;在A(sⅢ)和As(Ⅴ)摩尔比为1:1的混合液中,吸附总砷效果最好的是针铁矿,水铁矿次之,赤铁矿的吸附效果最差;A(sⅤ)的存在对除砷效果有一定的影响,三价砷和五价砷共存时,三种铁矿对其吸附具有一定的选择性。Two synthetic iron oxides including goethite and ferrihydrite as well as hematite were used as sorbent to adsorb the arsenic water sample. Results showed that the effect of ferrihydrite was the best in the initial concentration of 1,200μg/L of arsenic （Ⅲ） solution, but the adsorptive effect of goethite and hematite were relatively poor. In initial pH of 7 and mixed liquid with mol ratio of 1：1 of arsenic （Ⅲ） and arsenic （V）, the adsorptive effects of three ion oxides in the mixed liquid reduced as mol ratio of As/Fe increased. In the mixed liquid with mol ratio of 1：1 of arsenic （Ⅲ） and arsenic （V）, the best adsorptive effect was goethite, and then followed by ferrihydrite, while hematite showed the worst adsorptive effect. The presence of As（V） has an impact on removal efficiency. The adsorption of three iron oxides is selective under the coexistence of trivalent arsenic and quinquevalent arsenic.

关 键 词：铁矿 As(Ⅲ) As(Ⅴ) 水环境 吸附 

分 类 号：X131.2[环境科学与工程—环境科学]