ABSTRACT

In this study, urban pruning waste biosorbent after thermal activation process was used to remove zinc ion from aqueous solution. The zinc adsorption was fast, with values above 98.0% removal after 5 min. The maximum removal achieved was 99.4% in 360 min, at 30°C, pH 5.0, and initial zinc concentration of 10 mg L⁻¹. The adsorption process was adequately described by the pseudo-second-order kinetic model (R² = 1.000), and data obtained from batch adsorption experiments fitted well with the Langmuir isotherm model. The maximum adsorption capacity of zinc onto urban pruning waste biosorbent was 18.382 mg g⁻¹ at 30°C. Thus, it is concluded that urban pruning waste can be used as a low-cost alternative biosorbent to remove zinc in aqueous solutions.

摘要

本研究采用热活化处理后的城市修剪废弃物生物吸附剂去除水溶液中的锌离子。锌吸附很快，5 分钟后去除率高于 98.0%。在 30°C、pH 5.0 和 10 mg L ^-1的初始锌浓度下，在 360 分钟内达到的最大去除率为 99.4% 。准二级动力学模型( R ²  = 1.000)充分描述了吸附过程，从批量吸附实验中获得的数据与朗缪尔等温线模型拟合得很好。锌在城市修剪废弃物生物吸附剂上的最大吸附量在 30°C 时为 18.382 mg g ^{-1 。}因此，得出的结论是，城市修剪废物可用作低成本替代生物吸附剂，以去除水溶液中的锌。