Liang Sha, Guo Xueyi, Feng Ningchuan, Tian Qinghua
School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China.
Colloids Surf B Biointerfaces. 2009 Oct 1;73(1):10-4. doi: 10.1016/j.colsurfb.2009.04.021. Epub 2009 May 4.
The present article describes the adsorption behaviors of Cu2+ and Cd2+ on mercapto-acetic acid modified orange peel. The prepared adsorbents were characterized using Malvern Zetasizer, infrared spectrophotometer and infrared C-S analyzer. The effect of various parameters like solution pH, contact time, and initial metal ion concentration on adsorption efficiencies of these two metals were studied systematically by batch experiments. Adsorption isotherms of Cu2+ and Cd2+ on orange peel and mercapto-acetic acid modified orange peel were obtained and analyzed with Langmuir and Freundlich isotherm models. The rates of adsorption of Cu2+ and Cd2+ on both adsorbents were found to follow a pseudo-second order equation, indicating their chemical adsorption. Maximum adsorption capacities of Cu2+ and Cd2+ on the mercapto-acetic acid modified orange peel were found to be 70.67 and 136.05 mg/g, respectively. Adsorption-desorption studies showed that the mercapto-acetic acid modified orange peel could be used more than five cycles. This study demonstrated that, the waste orange peel after simple chemical treatment could be used as a potential adsorbent for toxic metals such as Cu2+ and Cd2+.
本文描述了Cu2+和Cd2+在巯基乙酸改性橙皮上的吸附行为。使用马尔文粒度分析仪、红外分光光度计和红外C-S分析仪对制备的吸附剂进行了表征。通过批量实验系统研究了溶液pH值、接触时间和初始金属离子浓度等各种参数对这两种金属吸附效率的影响。获得了Cu2+和Cd2+在橙皮和巯基乙酸改性橙皮上的吸附等温线，并用朗缪尔和弗伦德利希等温线模型进行了分析。发现Cu2+和Cd2+在两种吸附剂上的吸附速率均符合准二级方程，表明它们的吸附为化学吸附。巯基乙酸改性橙皮对Cu2+和Cd2+的最大吸附容量分别为70.67和136.05 mg/g。吸附-解吸研究表明，巯基乙酸改性橙皮可重复使用超过5个循环。本研究表明，经过简单化学处理后的废弃橙皮可作为一种潜在的吸附剂，用于吸附Cu2+和Cd2+等有毒金属。
