| 电炉钢渣对水中Cu2+、Cd2+和Pb2+的去除作用 |
| 摘要点击 2972 全文点击 1809 投稿时间：2008-11-06 修订日期：2008-12-26 |
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| 中文关键词 钢渣 重金属 吸附动力学 吸附等温线 热力学 |
| 英文关键词 slag heavy metal adsorption kinetics adsorption isotherm thermodynamic study |
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| 中文摘要 |
| 以宝钢电炉钢渣为研究对象，考察了钢渣对溶液中重金属离子Cu2+、Cd2+、Pb2+的吸附动力学、吸附等温线、吸附热力学特征，借助多种分析手段（XRD、BET比表面分析、SEM/EDS等）对钢渣进行了理化性能测试和表征.结果表明，电炉钢渣对重金属离子的吸附速率较快，吸附速率顺序为Cd2+＞Pb2+＞Cu2+，吸附过程符合一级动力学模型（R2＞0.99）.吸附等温实验结果表明，Langmuir模型较为适合重金属离子在钢渣上的吸附，实验条件下对Cu2+、Cd2+、Pb2+离子的最大吸附容量分别为0.101、 0.058、 0.120 mmol·g-1.3种重金属离子在钢渣上的吸附是一个吸热（ΔH0＜0）、熵值增大（ΔS0＞0）的自发反应过程（ΔG0＜0），熵效应是吸附反应自发进行的主要驱动力.SEM/EDS分析结果揭示了吸附前后钢渣表面形貌和化学成分的变化.电炉钢渣以其低价、高效性在重金属废水处理中具有广阔的应用前景. |
| 英文摘要 |
| Batch experiments were carried out to investigate the adsorption kinetics and thermodynamic characteristics of heavy metal ions Cu2+, Cd2+ and Pb2+ on the electric arc furnace (EAF) slag from Baoshan Steel Factory. Several kinds of techniques including XRD analysis、BET specific surface analysis and SEM/EDS analysis were employed to determine the physico-chemical and surface characteristics of slag. Results indicated that the adsorption rate of heavy metal ions on the EAF slag was relatively high, and the sorption rate followed the order Cd2+＞Pb2+＞Cu2+. The adsorption kinetics obeyed first-order kinetics model（R2＞0.99）. Adsorption isotherm experiment showed that adsorption isotherm of heavy metal ions on slag fitted Langmuir model, and the maximum adsorption capacity of Cu2+, Cd2+ and Pb2+ was 0.101, 0.058 and 0.120 mmol·g-1, respectively. The adsorption of heavy metal ions on slag was a spontaneous reaction（ΔG0＜0） with endotherm（ΔH0＜0） and the increase of enthopy（ΔS0＞0）. The effect of enthopy was the main driving force of the spontaneous adsorption reaction. The analysis results of SEM/EDS revealed the changes of surface morphology and chemical proportion before and after adsorption. Due to low-cost and high-efficiency, electric arc furnace slag showed great potential for the treatment of heavy metal polluted wastewaters. |
