FeOOH/MnO_2的制备与快速吸附去除水体中低浓度砷的试验  

Preparation of FeOOH/MnO_2 and Experiment of Quick Adsorption and Removal of Low Concentration Arsenic( As) from Aqueous Solution

作　　者：符云聪 黎红亮[1] 彭亮[1] 曾清如[1] 宋慧娟[1] 宋桂水 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128

出　　处：《净水技术》2015年第5期39-43,共5页Water Purification Technology

基　　金：湖南省自然科学基金（13JJ04068）

摘　　要：该文用化学沉积法在纳米MnO2表面修饰了不同量的FeOOH,以此获得了四种FeOOH/MnO2材料(Fe/Mn物质的量比分别为5/100、10/100、15/100和20/100)。通过对比,筛选出吸附效果最好的材料为20/100的FeOOH/MnO2,并对其进行去除水体中砷的性能研究。结果表明其吸附水中砷到达平衡时间小于10 min,速度大于单一的MnO2和铁锰氧化合物等材料。该吸附符合Freundlich吸附模型,最大吸附容量为19.71 mg/g。20/100的FeOOH/MnO2对砷吸附的最适p H为6且吸附率达97.4%,温度对吸附效果几乎没影响。总之,FeOOH/MnO2复合材料是一种潜在的高效去除水体中低浓度砷的材料。4 types of FeOOH/MnO2, Fe/Mn molar ratio of which were 5/100, 10/100, 15/100 and 20/100, were prepared by chemical deposition. The material which had the best adsorption effect was chosen and its properties for removal of As from aqueous solution were investigated. The results show 20/100 FeOOH/MnO2 has the best adsorption effect, and reaches equilibrium within 10 min, which is much faster than that of pure MnO2 and Fe-Mn bimetal oxide. The adsorption isotherm can be described by Freundlich adsorption model, and the maximum adsorption capacity is 19.71 mg/g. 20/100 FeOOH/MnO2 is able to remove 97.4% of As when pH is 6.0, but temperature hardly has an effect on adsorption. Overall, 20/100 FeOOH/MnO2 is a potential high efficient nanomaterial for removal of low concentration of As from water.

关 键 词：铁锰氧化物 制备 砷 吸附与去除 

分 类 号：X703[环境科学与工程—环境工程]