Raw material Banana peel (BP), was decolorized, and then was modified with 3-Chloro-2-hydroxypropyltrimethylammonium chloride to prepare modified banana peel bioabsorbent (MBP). The adsorbents were characterized by scanning electron microscopy. After modification, the adsorption capacity of MBP was higher than that of BP under the same conditions. The effects of solution pH, amount of adsorbent, metal ion concentration and adsorption time on the adsorption properties of Cr (Ⅵ) from aqueous solution were investigated. The results showed that the optimum solution pH was 2.0 and the optimum adsorbent was 4-5 g/L. The adsorption amount of MBP on Cr (Ⅵ) increases with the increase of metal ion concentration in solution. The adsorption isotherm was in accordance with the Langmuir monolayer adsorption model. The maximum adsorption capacity of MBP to Cr (Ⅵ) was 58.82 mg/g at 40℃. The adsorption of Cr (Ⅵ) by MBP reached the adsorption equilibrium at 150 min, and the adsorption kinetics was consistent with the quasi –second-order kinetic equation.%以香蕉皮(BP)为原料,脱色后通过3-氯-2-羟丙基三甲基氯化铵改性制备新型香蕉皮生物吸附剂MBP.采用扫描电镜对吸附剂进行表征.经改性后,同等条件下MBP比BP的吸附量提高.考察溶液pH、吸附剂用量、金属离子浓度和吸附时间对其从水溶液中吸附Cr(Ⅵ)的吸附性能的影响.结果表明,最佳的溶液pH值为2.0,最佳吸附剂用量4-5 g/L.MBP对Cr(Ⅵ)的吸附量随溶液中金属离子浓度的增加而增加,吸附等温线符合Langmuir单分子层吸附模型,MBP在40℃对Cr(Ⅵ)的最大吸附量为58.82 mg/g;MBP对Cr(Ⅵ)的吸附,在150 min时基本上达到吸附平衡,吸附动力学符合准二级动力学方程.
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