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从吸附时间、pH值、吸附剂加入量、铬离子初始浓度4个方面,通过原子吸收光谱法比较了改性甘蔗渣、改性花生壳和改性梨渣的吸附特性。在铬离子浓度100mg.L-1、吸附剂投量15g.L-1、最佳pH值、吸附时间120min的实验条件下,三者吸附率不同,改性甘蔗渣的吸附率达86.7%以上,改性花生壳吸附率达64.8%,改性梨渣的吸附率达60.8%。3种改性吸附剂对Cr()离子的吸附均符合Langmuir等温模型,其最大吸附能力分别为23.92、22.09、20.47mg.g-1。准一级反应动力学方程可描述3种改性吸附剂对Cr()离子的吸附过程。
The adsorption characteristics of modified bagasse, modified peanut shell and modified pear residue were compared by atomic absorption spectrometry from four aspects: adsorption time, pH value, amount of adsorbent added and initial concentration of chromium ion. Under the experimental conditions of chromium ion concentration 100mg.L-1, adsorbent dosage 15g.L-1, optimum pH and adsorption time 120min, the adsorption rates of the three modified sugarcane bagasse were more than 86.7% , Modified peanut shell adsorption rate of 64.8%, modified pear residue adsorption rate of 60.8%. The adsorption of Cr (superscript 3 +) by the three modified adsorbents all accorded with the Langmuir isothermal model, and their maximum adsorption capacities were 23.92, 22.09 and 20.47 mg.g-1, respectively. Quasi-first-order reaction kinetics equations describe the adsorption of Cr () ions by three modified adsorbents.