Chen Xiao, Hou Wen-hua, Wang Qun-hui
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Huan Jing Ke Xue. 2009 Oct 15;30(10):2940-5.
Batch experiments were carried out to investigate the adsorption kinetics and thermodynamic characteristics of heavy metal ions Cu2+, Cd2+ and Pb2+ on the electric are 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 x g(-1), respectively. The adsorption of heavy metal ions on slag was a spontaneous reaction (deltaG0 < 0) with endotherm (delta H0 < 0) and the increase of enthopy (AS0 > 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 are furnace slag showed great potential for the treatment of heavy metal polluted wastewaters.
进行了批次实验，以研究宝钢电弧炉（EAF）炉渣对重金属离子Cu2+、Cd2+和Pb2+的吸附动力学及热力学特性。采用了包括XRD分析、BET比表面积分析和SEM/EDS分析在内的多种技术来测定炉渣的物理化学和表面特性。结果表明，重金属离子在电弧炉炉渣上的吸附速率相对较高，吸附速率顺序为Cd2+>Pb2+>Cu2+。吸附动力学符合一级动力学模型（R2>0.99）。吸附等温线实验表明，重金属离子在炉渣上的吸附等温线符合Langmuir模型，Cu2+、Cd2+和Pb2+的最大吸附容量分别为0.101、0.058和0.120 mmol·g-1。重金属离子在炉渣上的吸附是一个自发反应（ΔG0<0），为吸热反应（ΔH0>0）且熵增加（ΔS0>0）。熵的影响是自发吸附反应的主要驱动力。SEM/EDS分析结果揭示了吸附前后表面形态和化学组成的变化。由于成本低、效率高，电弧炉炉渣在处理重金属污染废水方面显示出巨大潜力。
