介质离子强度对Cu^(2+)在针铁矿和δ-MnO_2表面吸附影响的红外光谱  

Infrared Spectrum Study on Effect of Ionic Strength on Cu^(2+) Adsorption on Goethite and δ-MnO_2 Surface

作　　者：王帅[1,2] 李翠兰[1] 王楠[3] 张晋京[1] 窦森[1] 

机构地区：[1]吉林农业大学资源与环境学院,长春130118 [2]吉林市农业技术推广中心,吉林吉林132013 [3]吉林农业科技学院,吉林吉林132101

出　　处：《吉林大学学报（理学版）》2011年第2期353-357,共5页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:40471076);国家科技支撑项目(批准号:2009BAC55B05)

摘　　要：应用红外光谱研究不同离子强度(c(NaNO3)=0.01～1.0 mol/L)条件下,针铁矿和δ-MnO2吸附Cu2+前后表面羟基结构及其特征吸收峰的变化.结果表明:表面游离羟基参与了针铁矿和δ-MnO2对Cu2+的吸附,其Fe—O—(H)和Mn—O—(H)结构中的H+被Cu2+取代,转变为Fe—O—(Cu)和Mn—O—(Cu);随介质离子强度的增加,NaNO3的NO3-能以—NO2的形式参与吸附反应并缔结在两种氧化物表面;δ-MnO2吸附Cu2+后特征吸收峰未发生明显变化,而针铁矿则相反.Infrared spectrum technique was applied to analyzing the changes of surface —OH structures and characteristic adsorption peaks of the goethite and δ-MnO2 which had adsorbed Cu2＋ under different ionic strengths（c（NaNO3）=0.01—1.0 mol/L）.The results show that the surface free —OH participated in the adsorption of Cu2＋ on goethite and δ-MnO2,the hydrogen ions of Fe—O—（H） and Mn—O—（H） were replaced by copper ions,resulting in the formation of Fe—O—（Cu） and Mn—O—（Cu）.With the ionic strength increasing,—NO2 from NO-3 of NaNO3 can be attached to the surfaces of goethite and δ-MnO2.After the adsorption of Cu2＋,the infrared spectrum of δ-MnO2 was not changed significantly,but that of goethite was inverse.

关 键 词：红外光谱 针铁矿 Δ-MNO2 铜离子 

分 类 号：X132[环境科学与工程—环境科学] O433.4[机械工程—光学工程]