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pH对Eu(Ⅲ)在氧化铝上吸附行为的影响 被引量:2

Effect of pH on the Adsorption of Eu(Ⅲ) onto Al_2O_3
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摘要 在N2环境下,离子强度为0.1 mol/L 的NaClO4溶液中,考察了不同pH值(3.0~11.0)对Eu(Ⅲ)在氧化铝上吸附行为的影响,用荧光时间衰减光谱法研究了Eu(Ⅲ) 在氧化铝表面上的化学形态.结果表明,Eu(Ⅲ)在氧化铝上的吸附随pH值的升高而增强,在较低pH值(<4.0)溶液中,绝大部分Eu以自由的Eu3+存在于溶液中;在较高pH值(>6.9)溶液中,Eu(Ⅲ)在氧化铝上的吸附形态会失去大部分水,形成化学吸附,吸附形态为≡(Al-O)-Eu2+*(H2O)4. The effect of pH on the adsorption of Eu(Ⅲ) onto γ-Al2O3 was studied at pH 3.0 11.0, in 0.1 mol/L NaCIO4 and under N2 atmosphere. The chemical species of Eu(Ⅲ) at γ-Al2O3 surface was also studied by using time resolved laser fluorescence spectroscopy (TRLFS). The results indicate that thead sorption of Eu( Ⅲ ) on alumina increases with the rise of pH, and chemical adsorption is formed at high pH values(〉6.9), i.e, thespeciesofEu(Ⅲ) is≡(Al-O)-Eu^2+·(H2O)4.
出处 《武汉大学学报(理学版)》 CAS CSCD 北大核心 2005年第6期691-694,共4页 Journal of Wuhan University:Natural Science Edition
基金 中国科学院"百人计划"基金资助项目(C03124025) 安徽省教育厅自然科学基金资助项目(2005KJ227)
关键词 荧光时间衰减光谱法 氧化铝 EU 吸附 time resolved laser fluorescence spectroscopy (TRLFS) alumina Eu adsorption
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