Removal of metal ions and humic acid from water by iron-coated filter media.
Removal of metal ions and humic acid from water by iron-coated filter media.
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DOI：
10.1016/s0045-6535(00)00307-6
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发表时间：
2001-08
期刊：
影响因子：
8.8
通讯作者：
C. Lai;Chih-Yu Chen
中科院分区：
文献类型：
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作者：
C. Lai;Chih-Yu Chen
氧化铁是一种优良的可再生吸附剂，常通过吸附反应控制游离金属。利用加热工艺在砂表面涂覆氧化铁，使介质可以在填料塔中使用。通过批式和柱式实验研究了铁包砂对水中金属离子和天然有机物的吸附性能。化学分析（x射线能量色散分析，EDAX）用于表征铁包覆砂上铜和铅的吸附位点。从批量实验结果来看，铁包砂在竞争吸附系统中可以同时去除铜和铅离子。砂表面铜、铅离子与氧化铁的相互作用主要是化学键。包铁砂对铜和铅的最大吸附量分别为0.259 mg Cu/g砂和1.211 mg Pb/g砂。腐植酸的存在导致铜和铅的吸附增加。柱实验结果表明，铜离子、铅离子和腐植酸在断点前可以完全去除。因此，铁包覆砂可用于吸附/过滤水中的金属离子和天然有机物。
Iron oxide is an excellent, regenerable adsorbent, and often controls free metals through adsorption reaction. The utilization of heating process for coating iron oxide on sand surface allowed the media to be used in a packed column. Iron-coated sand was investigated for adsorbing metal ions and natural organic matter from water by batch and column experiments. Chemical analysis (energy dispersive analysis of X-ray, EDAX) was used for characterizing the copper and lead adsorption sites on iron-coated sand. From the batch experiment results, the copper and lead ions could be removed simultaneously by the iron-coated sand in the competition adsorption system. The interaction between copper, lead ions and iron oxide on sand surface was primarily the chemical bonds. The maximum adsorption capacities of iron-coated sand for copper and lead were 0.259 mg Cu/g-sand and 1.211 mg Pb/g-sand, respectively. The presence of humic acid led to increase the adsorption of copper and lead. Results from column experiments indicated that the copper ions, lead ions and humic acid could be removed completely before the breakpoint. Consequently, the iron-coated sand may be applied for the adsorption/filtration of metal ions and natural organic matters from water.