论文部分内容阅读
利用纳米TiO2的表面吸附活性,以[S2O3]2-为络合剂,应用火焰原子吸收光谱检测方法,高效吸附分离了水中痕量Ag(Ⅰ).系统研究了纳米TiO2的晶体结构、溶液的pH值、吸附时间、Ag(Ⅰ)的起始浓度及常见共存离子对吸附率的影响,确定了最佳吸附条件.FTIR光谱分析结果表明,Ag(Ⅰ)配合物以物理作用吸附在纳米TiO2颗粒表面.纳米TiO2对Ag(Ⅰ)的吸附等温线为S型,表现出多分子层吸附特征.硝酸和硫脲混合溶液可将吸附在TiO2纳米颗粒表面的Ag(Ⅰ)全部洗脱.
The surface adsorption activity of nano-TiO2 was studied, and trace amount of Ag (Ⅰ) in water was adsorbed and separated by flame atomic absorption spectrometry with [S2O3] 2- as complexing agent. The crystal structure, pH value, adsorption time, initial concentration of Ag (Ⅰ) and the effect of common coexisting ions on the adsorption rate were investigated.The results of FTIR spectroscopy showed that Ag (Ⅰ) complex was physically adsorbed on the surface of nano-TiO2 The adsorption isotherm of Ag (Ⅰ) is S-type, which shows the multi-molecular layer adsorption characteristics.The Ag (Ⅰ) adsorbed on the surface of TiO2 nanoparticles can all be eluted by the mixed solution of nitric acid and thiourea.