论文部分内容阅读
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 effect of phosphatizing modified pear residue on Cr (Ⅵ) ion adsorption was studied by atomic absorption spectroscopy under different pH values, adsorbent dosage, adsorbate concentration and adsorption time. Cr (Ⅵ) ions reached the maximum value when the solution initial pH was 4.5; esterified pear residue (≥10g.L-1) could remove 86.5% Cr (Ⅵ) ions from 100μg.L-1 Cr . The sorption of Cr (Ⅵ) ion by esterified pear residue accorded with Langmuir isothermal model and its maximum adsorption capacity was 67.56μg.g-1. The equilibrium time of Cr (Ⅵ) ion reaches 90min, and the quasi-first-order reaction kinetics equation can describe the adsorption of Cr (Ⅵ) ion by esterified pear residue.