甘蔗渣和玉米芯对水中亚甲基蓝的吸附去除作用

 合理处理处置农业生产过程中产生的大量固体废弃物,已成为农业和环境领域共同关注的焦点。选取了两种常见的农业固体废弃物甘蔗渣、玉米芯,用批量平衡吸附实验研究其对水中亚甲基蓝染料的吸附作用。吸附动力学结果表明,甘蔗渣和玉米芯对亚甲基蓝的吸附平衡时间小于4 h,吸附动力学过程可用准二级动力学模型精准拟合(R²>0.9),表明化学吸附主导了整个吸附过程;等温吸附曲线为典型的非线性吸附,可用Langmuir 等温吸附模型拟合。结果表明,甘蔗渣和玉米芯对水中亚甲基蓝有较好的吸附去除能力,最大吸附量分别为22.03 和19.72 mg/g。

Removal of methylene blue dye from water by bagasse and corn cob

The proper disposal of massive agricultural solid waste is one of main agricultural and environmental concerns. The bagasse and the corn cob are selected as two typical agricultural solid wastes in this study to investigate the adsorption kinetics and the equilibrium isotherms of the dye methylene blue (MB). It is shown that the adsorption rate is great and the equilibrium is reached in less than 4 h. The sorption kinetics can be well described by a pseudo-second-order kinetic model and is fitted with the R2 value greater than 0.9, indicating a chemisorption dominated process. The adsorption isotherms are non-linear, and can be well fitted by the Langmuir adsorption model. The bagasse and the corn cob show a good sorption capacity with respect to the MB, and the maximum adsorption amount of the MB by the bagasse and the corn cob are 22.03 and 19.72 mg/g, respectively.