原子吸收光谱法测定磷酸酯化梨渣吸附的Cr(Ⅵ)离子

Determination of Chromium(Ⅵ) Absorption in Phosphoric Acid Esterified Pear Scraps by Atomic Absorption Spectrophotometry

通过原子吸收光谱法研究了在不同pH值、吸附剂量、吸附质浓度和吸附时间条件下磷酸酯化改性梨渣吸附Cr(Ⅵ)离子的效果。溶液初始pH 4.5时,Cr(Ⅵ)离子的吸附达到最大值;酯化梨渣≥10g.L-1能除去Cr(Ⅵ)为100μg.L-1溶液中的86.5%的Cr(Ⅵ)离子。酯化梨渣对Cr(Ⅵ)离子的吸附符合Langmuir等温模型,其最大吸附能力为67.56μg.g-1。Cr(Ⅵ)离子达到吸附平衡的时间为90min,准一级反应动力学方程可描述酯化梨渣对Cr(Ⅵ)离子的吸附过程。

The characteristic of Cr（Ⅵ） adsorption in phosphoric acid esterified pear scraps（EPS） under conditions of different initial pH,absorbent dosage,adsorption solute concentration,and adsorption time were studied by atomic absorption spectrophotometry.The maximum adsorption of Cr（Ⅵ） was obtained at the initial pH of 4.5,86.5% of Cr（Ⅵ） in 100μg·L-1 Cr（Ⅵ）solution could be removed by EPS（CEPS≥10g·L-1） of EPS.The adsorption of Cr（Ⅵ） fitted the Langmuir sorption model.The maximum adsorption capacity（Qm） of EPS was 67.56μg·g-1 for Cr（Ⅵ）,and the adsorption equilibrium of Cr（Ⅵ）was reached within 90min.The adsorption processes of Cr（Ⅵ） could be described by standard-first order kinetic functions.