Lee S M, Davis A P
Department of Environmental Engineering, Kwandong University, Yangyang 215-800, South Korea.
Water Res. 2001 Feb;35(2):534-40. doi: 10.1016/s0043-1354(00)00284-0.
Dried waste slurry generated in seafood processing factories has been shown to be an effective adsorbent for the removal of heavy metals from dilute solutions. Characterization of the sludge surface with scanning electron microscope and X-ray microanalyzer were carried out to evaluate the components on the sludge surface that are related to the adsorption of metal ions. Aluminum and calcium, as well as organic carbon are distributed on the surface of sludge. Alkalimetric titration was used to characterize the surface acidity of the sludge sample. The surface acidity constants, pKa1s and pKa2s, were 5.80 and 9.55, respectively. Batch as well as dynamic adsorption studies were conducted with 10(-5) to 5 x 10(-3) M Cu(II) and Cd(II). A surface complexation model with the diffuse layer model successfully predicted Cu(II) and Cd(II) removals in single metal solutions. Predictions of sorption in binary-adsorbate systems based on single-adsorbate data fits represented competitive sorption data reasonably well over a wide range of conditions. The breakthrough capacity found from column studies was different for each metal ion and the data reflect the order of metal affinity for the adsorbent material very well.
海鲜加工厂产生的干废渣已被证明是一种从稀溶液中去除重金属的有效吸附剂。利用扫描电子显微镜和X射线微分析仪对污泥表面进行了表征，以评估污泥表面与金属离子吸附相关的成分。铝、钙以及有机碳分布在污泥表面。采用酸碱滴定法对污泥样品的表面酸度进行了表征。表面酸度常数pKa1s和pKa2s分别为5.80和9.55。对10(-5)至5×10(-3)M的Cu(II)和Cd(II)进行了间歇和动态吸附研究。具有扩散层模型的表面络合模型成功地预测了单一金属溶液中Cu(II)和Cd(II)的去除情况。基于单吸附质数据拟合对二元吸附质体系中吸附的预测在很宽的条件范围内能较好地反映竞争吸附数据。柱研究得出的穿透容量对每种金属离子都不同，数据很好地反映了金属对吸附剂材料的亲和顺序。
