(1. 中南大学 冶金科学与工程学院，长沙 410083；2. 宁夏医学院 基础学院，银川 750004)
摘 要: 以橘子皮为基体，经环氧氯丙烷交联后，以Ce4+为引发剂将丙烯酸甲酯单体接枝到橘子皮上，再经过皂化制备改性橘子皮生物吸附剂。研究溶液pH、吸附时间和Cu2+初始浓度对生物吸附剂吸附性能的影响。结果表明，在pH值为5.5，Cu2+初始质量浓度为50 mg/L，吸附时间为3 h的条件下，该生物吸附剂对Cu2+去除率为94.6%，吸附容量为24.41 mg/g。Cu2+在该生物吸附剂上的吸附过程可以用准二级动力学方程很好地描述。吸附等温线结果表明，该生物吸附剂对Cu2+的吸附用Freundlich方程拟合效果优于用Langmuir方程拟合效果。将该生物吸附剂用于含Cu2+ 5.8 mg/L的电镀废水，Cu2+去除率可达97%。通过红外光谱表征该生物吸附剂的结构，说明羧基和羟基与金属离子的结合引起该生物吸附剂对Cu2+的吸附。该生物吸附剂可以再生重复使用4次以上。
关键字: 橘子皮；化学改性；Cu(Ⅱ)离子；生物吸附
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. School of Basic Medical Science, Ningxia Medical College, Yinchuan 750004, China）
Abstract:The chemically modified orange peel was prepared from hydrolysis of the grafted copolymer, which was synthesized by interacting methyl acrylate with cross-linking orange peel. Various factors were investigated by batch experiments, including pH value, adsorption time and initial concentration of Cu2+, to study their effects on adsorption characteristics of the biosorbent on Cu2+. The results show that when pH value is 5.5 and the initial concentration of Cu2+ is 50 mg/L, the removal rate achieves 94.6% after 3 h adsorption, and the adsorption capacity is 24.41mg/g. The kinetic characteristics of Cu2+ biosorption were investigated and the adsorption processes were found to follow pseudo-second order type adsorption kinetics. The adsorption isotherms results indicate that Freundlich model fits the adsorption process much better than the Langmuir model. The removal rate of 5.8 mg/L Cu2+ in 50 mL of electroplating wastewater is 97% when 1 g of the biosorbent is used at pH value of 5.5. The biosorbent was characterized by using infrared spectroscopy. The analysis of IR spectrum indicates that the adsorption of Cu2+ by the biosorbent caused the combination of carboxyl and hydroxyl groups with heavy metal. The biosorbent is suitable for repeated use more than four cycles.
Key words: orange peel; chemical modification; Cu(Ⅱ) ion; biosorption
