采用机械活化法协同FeCl₃预处理甲壳素,然后将其溶解在NaOH/尿素溶液中,再与海藻酸钠溶液共混,逐滴加入到CaCl₂溶液中,制备出甲壳素/海藻酸钙凝胶球(CCAGB),作为吸附剂吸附Cu²⁺。利用FT-IR、XPS和SEM对凝胶球进行表征,探究溶液初始pH、质量浓度等对吸附性能的影响。结果表明,甲壳素和海藻酸钠最佳质量比为1∶5时,CCAGB的结构稳定且具有蜂窝状的孔结构;在温度为30℃、转速为150 r/min、pH为6.0和吸附平衡时间为10 h的条件下,CCAGB对Cu²⁺的最大吸附量为169.49 mg/g,其吸附过程符合准二级动力学模型和Langmuir吸附等温模型。

Chitin is pretreated by mechanical activation-FeCl₃,and then dissolved in NaOH/urea solution.The chitin solution is mixed with sodium alginate (SA) solution and is together added dropwise to CaCl₂ solution to prepare chitin/calcium alginate gel beads (CCAGBs),which is used as adsorbent for adsorption of Cu²⁺ ions.CCAGBs are characterized by FT-IR,XPS,and SEM.The effects of initial pH and the concentration of Cu²⁺ solution on the adsorption performance of CCAGBs are investigated.The results show that the prepared CCAGBs has a stable structure with a honeycomb pore structure when the best mass ratio of chitin/SA is 1∶5.The maximum adsorption capacity of CCAGBs for Cu²⁺ reaches 169.49 mg·g^-1 when the temperature is at 30℃,the rotation speed is 150 r·min^-1,pH 6.0,and adsorption equilibrium time 10 h.The adsorption process conforms to the pseudo-second order kinetic model and Langmuir adsorption isotherm model.

邓玉唤(1991-),女,硕士研究生,研究方向为污水处理,1140210255@qq.com