纳米TiO_2对水中Sn（Ⅳ）和Ce（Ⅲ）吸附行为的研究
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摘要
纳米Ti02由于粒径小、比表面积大,表面存在大量羟基能够和阳离子键合,对金属离子表现出较强的吸附能力,是一种有着巨大应用前景的吸附材料。纳米Ti02对于吸附分离废水中的Cr(Ⅲ)和Cr(Ⅳ),As(Ⅲ)和As(Ⅴ), Y, Yb等稀土离子,均表现出良好的吸附-脱附性能。有关锐钛矿纳米Ti02对水中Sn(Ⅳ)和Ce(Ⅲ)的吸附分离研究少见文献报道。
利用纳米Ti02颗粒的表面吸附活性,高效分离了水中的微量Sn(Ⅳ)。系统研究了纳米Ti02结构、溶液的pH值、纳米TiO2用量、Sn(Ⅳ)的起始浓度对Sn(Ⅳ)吸附率的影响。纳米Ti02对Sn(Ⅳ)的吸附等温线为S型,表现出多分子层吸附特征。吸附在纳米Ti02颗粒表面的Sn(Ⅳ)可用4.0 mol/L的HCl溶液进行洗脱,洗脱率超过99%。
利用纳米Ti02高效分离了水中的微量Ce(Ⅲ)。系统研究了纳米Ti02的结构、溶液的pH值、吸附时间、Ce(Ⅲ)的起始浓度及共存离子对吸附率的影响,确定了最佳吸附条件。测定了纳米Ti02对Ce(Ⅲ)的吸附等温线,应用Frendlich公式得到了吸附等温方程。0.3 mol/L的HCl具有最高的洗脱效率。
The TiO2 nanoparticles showed efficient adsorption property toward metal ions because of its small size, big specific surface area and a lot of hydroxyl group, which could bond with metal ions. The Cr(Ⅲ), Cr(IV), As(Ⅲ), As(Ⅴ), Y and Yb ions could be efficient from waste solutions taking TiO2 nanoparticles as adsorbent. But the adsorption of Sn(Ⅳ) and Ce(Ⅲ) ions by anatase TiO2 nanoparticles has less reported.
An efficient separation of the trace Sn(Ⅳ) was carried out taking TiO2 nanoparticles as adsorbent. The effects of the crystalline of TiO2 nanoparticles, pH values, mass of TiO2, initial concentration of Sn(Ⅳ) on the adsorption rate were systematically studied. The adsorption isotherm of Sn(Ⅳ) showed "s" type, which could be explained by the multi-molecular layer adsorption. The elution efficiency of the Sn(Ⅳ) adsorbed on TiO2 nanoparticles in 4.0 mol/L hydrochloric acid was more than 99%.
An efficient separation of trace Ce(Ⅲ) was carried out using TiO2 nanoparticles as adsorbent. The effects of the crystalline of TiO2 nanoparticles, pH values, adsorption time, initial concentration of Ce(Ⅲ) and some coexistent ions on the adsorption rate were systematically studied. The optimum adsorption conditions were determined. The adsorption isotherm was obtained and the isotherm equation was implored based on Frendlich formula.0.3 mol/L Hydrochloric acid showed the highest elution efficiency.
利用纳米Ti02颗粒的表面吸附活性,高效分离了水中的微量Sn(Ⅳ)。系统研究了纳米Ti02结构、溶液的pH值、纳米TiO2用量、Sn(Ⅳ)的起始浓度对Sn(Ⅳ)吸附率的影响。纳米Ti02对Sn(Ⅳ)的吸附等温线为S型,表现出多分子层吸附特征。吸附在纳米Ti02颗粒表面的Sn(Ⅳ)可用4.0 mol/L的HCl溶液进行洗脱,洗脱率超过99%。
利用纳米Ti02高效分离了水中的微量Ce(Ⅲ)。系统研究了纳米Ti02的结构、溶液的pH值、吸附时间、Ce(Ⅲ)的起始浓度及共存离子对吸附率的影响,确定了最佳吸附条件。测定了纳米Ti02对Ce(Ⅲ)的吸附等温线,应用Frendlich公式得到了吸附等温方程。0.3 mol/L的HCl具有最高的洗脱效率。
The TiO2 nanoparticles showed efficient adsorption property toward metal ions because of its small size, big specific surface area and a lot of hydroxyl group, which could bond with metal ions. The Cr(Ⅲ), Cr(IV), As(Ⅲ), As(Ⅴ), Y and Yb ions could be efficient from waste solutions taking TiO2 nanoparticles as adsorbent. But the adsorption of Sn(Ⅳ) and Ce(Ⅲ) ions by anatase TiO2 nanoparticles has less reported.
An efficient separation of the trace Sn(Ⅳ) was carried out taking TiO2 nanoparticles as adsorbent. The effects of the crystalline of TiO2 nanoparticles, pH values, mass of TiO2, initial concentration of Sn(Ⅳ) on the adsorption rate were systematically studied. The adsorption isotherm of Sn(Ⅳ) showed "s" type, which could be explained by the multi-molecular layer adsorption. The elution efficiency of the Sn(Ⅳ) adsorbed on TiO2 nanoparticles in 4.0 mol/L hydrochloric acid was more than 99%.
An efficient separation of trace Ce(Ⅲ) was carried out using TiO2 nanoparticles as adsorbent. The effects of the crystalline of TiO2 nanoparticles, pH values, adsorption time, initial concentration of Ce(Ⅲ) and some coexistent ions on the adsorption rate were systematically studied. The optimum adsorption conditions were determined. The adsorption isotherm was obtained and the isotherm equation was implored based on Frendlich formula.0.3 mol/L Hydrochloric acid showed the highest elution efficiency.
引文
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