Department of Civil and Environmental Engineering, American University of Beirut, P.O. Box 11-0236, Beirut, Lebanon.
J Hazard Mater. 2010 Jan 15;173(1-3):236-42. doi: 10.1016/j.jhazmat.2009.08.074. Epub 2009 Aug 22.
Untreated Pinus halepensis sawdust has been investigated as an adsorbent for the removal of cadmium from aqueous solutions. Batch experiments were carried out to investigate the effect of pH, adsorbent dose, contact time, and metal concentration on sorption efficiency. The favorable pH for maximum cadmium adsorption was at 9.0. For the investigated cadmium concentrations (1-50mg/L), maximum adsorption rates were achieved almost in the 10-20 min of contact. An adsorbent dose of 10 g/L was optimum for almost complete cadmium removal within 30 min from a 5mg/L cadmium solution. For all contact times, an increase in cadmium concentration resulted in decrease in the percent cadmium removal (100-87%), and an increase in adsorption capacity (0.11-5.36 mg/g). The equilibrium adsorption data were best fitted with the Freundlich isotherm (R(2)=0.960). The kinetics of cadmium adsorption was very well described by the pseudo-second-order kinetic model (R(2)>0.999).
未处理的欧洲赤松木屑已被研究为从水溶液中去除镉的吸附剂。进行了批量实验，以研究 pH 值、吸附剂剂量、接触时间和金属浓度对吸附效率的影响。最大镉吸附的最佳 pH 值为 9.0。对于所研究的镉浓度（1-50mg/L），在接触 10-20 分钟内几乎达到了最大吸附速率。对于 5mg/L 镉溶液，在 30 分钟内几乎完全去除镉，最佳吸附剂剂量为 10g/L。对于所有接触时间，镉浓度的增加导致镉去除率（100-87%）下降，吸附容量（0.11-5.36mg/g）增加。平衡吸附数据与 Freundlich 等温线拟合最好（R(2)=0.960）。镉吸附的动力学很好地符合伪二级动力学模型（R(2)>0.999）。
