The removal of heavy metals in urban runoff by sorption on mulch
The removal of heavy metals in urban runoff by sorption on mulch
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DOI：
10.1016/j.envpol.2004.05.020
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发表时间：
2005-01-01
影响因子：
8.9
通讯作者：
Bishop, PL
中科院分区：
文献类型：
--
作者：
Jang, A;Seo, Y;Bishop, PL
进行了一系列吸附实验，以评估三种地膜去除城市径流中常见的几种重金属离子的能力。选择柏树树皮(C)、阔叶树树皮(H)和松树皮金块(P)3种覆盖物作为城市径流中重金属的潜在吸附剂。阔叶树皮(H)覆盖物对重金属离子的吸附性能最好。此外，由于H膜的去除速度快，对所有重金属离子的吸附能力都可以接受，因此H膜是三种吸附剂中处理含痕量重金属的城市径流的最佳吸附剂。为了研究吸附等温线，分析了Freundlich和Langmuir吸附等温线两种平衡模型。这些金属在H膜上的吸附符合Langmuir吸附方程的线性形式。在pH值为5和6时，每种金属的朗缪尔常数(S-m)分别为0.324和0.359 mmoL/g(铜)，0.306和0.350 mmoL/g(铅)，以及0.185和0.187 mmoL/g(锌)(25℃)。(C)2004爱思唯尔有限公司。保留所有权利。
A series of adsorption experiments was conducted in order to assess the ability of three mulches to remove several of the heavy metal ions typically encountered in urban runoff. Three types of mulch, cypress bark (C), hardwood bark (H), and pine bark nugget (P), were selected as potential sorbents to capture heavy metals in urban runoff. The hardwood bark (H) mulch had the best physicochemical properties for adsorption of heavy metal ions. In addition, because of its fast removal rate and acceptably high capacity for all the heavy metal ions, it was concluded that the H mulch is the best of the three adsorbents for treatment of urban runoff containing trace amounts of heavy metals. in order to investigate the sorption isotherm, two equilibrium models, the Freundlich and Langmuir isotherms, were analyzed. The sorption of these metals on H mulch conformed to the linear form of the Langmuir adsorption equation. At pH 5 and 6, the Langmuir constants (S-m) for each metal were found to be 0.324 and 0.359 mmol/ g (Cu); 0.306 and 0.350 mmol/g (Pb); and 0.185 and 0.187 mmol/g (Zn) at 25 degreesC. (C) 2004 Elsevier Ltd. All rights reserved.