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研究了介孔Ti O2分离富集材料的制备及其对Cd(Ⅱ)的吸附性能,考察了影响吸附和解吸的主要因素。pH=6.0时,介孔Ti O2能定量吸附溶液中的痕量Cd(Ⅱ),其静态饱和吸附容量为57.8 mg/g。吸附在介孔Ti O2上的Cd(Ⅱ)可用1 mol/L HCl洗脱,洗脱液中的Cd(Ⅱ)用火焰原子吸收法测定。本法对Cd(Ⅱ)的检出限(3σ)为23.3 ng/mL,相对标准偏差(RSD)为2.0%(n=7,c=1.0μg/mL),回收率在94.0%～102.5%之间。该方法用于矿样中痕量Cd(Ⅱ)的测定,结果满意。
The preparation of mesoporous Ti (OH) 2 separation and enrichment material and its adsorption ability to Cd (Ⅱ) were studied. The main factors affecting the adsorption and desorption were investigated. The mesoporous Ti O2 can quantify the trace amount of Cd (Ⅱ) in the solution at pH = 6.0, and its static saturated adsorption capacity is 57.8 mg / g. Cd (Ⅱ) adsorbed on mesoporous Ti O2 eluted with 1 mol / L HCl, and Cd (Ⅱ) in the eluate was determined by flame atomic absorption spectrometry. The detection limit (3σ) and the relative standard deviation (RSD) of this method were 23.3 ng / mL and 2.0% (n = 7, c = 1.0μg / mL) for Cd (Ⅱ). The recoveries ranged from 94.0% to 102.5% between. The method was applied to the determination of trace Cd (Ⅱ) in ore samples with satisfactory results.