纳米TiO_2对Ag(Ⅰ)配合物的吸附  

Adsorption of Coordination Compound of Ag(Ⅰ) on TiO_2 Nanoparticles

作　　者：张霞[1] 赵月[1] 周春彬[2] 孙挺[1] 

机构地区：[1]东北大学理学院,沈阳110004 [2]辽宁林业职业技术学院,沈阳110101

出　　处：《高等学校化学学报》2009年第1期121-124,共4页Chemical Journal of Chinese Universities

基　　金：国家“八六三”计划(批准号:2007AA06Z116);国家“九七三”计划(批准号:G2006CB605103);东北大学博士后基金资助

摘　　要：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.An efficient separation of coordination compound of Ag（ I ） was carried out taking TiO2 nanoparticles as adsorbent, [ S2O3 ] 2-anion as ligand and Flame Atomic Absorption Spectrophometer（FAAS） as detector to determine the concentration of Ag（ I ）. The effect of the crystalline structure of TiO2 nanoparticles, pH values, adsorption time, initial concentration of Ag（ I ）, and some coexistent ion on the adsorption rate was systematically studied. The FTIR spectrum show that the coordination compound of Ag（ I ） is physically adsorbed on the surface of TiO2 nanoparticles. The adsorption isotherm of Ag （ I ） on nano-TiO2 show ＂S＂ type, which can be explained by the multi-molecular layer adsorption. The Ag（ I ） adsorbed on TiO2 nanoparticles could be eluted completely by mixed solution of nitric acid（ 1 mol/L） and sulfourea（2 g/L）. The above experiment results would be valuable for using the nano-adsorbents to separate trace Ag（ I ） in waste water.

关 键 词：纳米TIO2 纳米吸附剂 吸附等温线 

分 类 号：O647.3[理学—物理化学]