(1. 河北农业大学 食品科技学院，保定 071000；
2. 河北农业大学 海洋学院，秦皇岛 066000)
摘 要: 以非活性羊栖菜粉为吸附剂，研究羊栖菜对水溶液中Cd2+的吸附特性。结果发现：在最佳吸附pH为5，温度为313.15 K，吸附剂浓度为1 g/L，Cd2+初始浓度为40 mg/L左右时，羊栖菜对镉离子的去除率的最大值为92.54%，且吸附10 min时，即达到最大去除率93.95%；在60 min时，基本达到吸附平衡，羊栖菜对Cd2+的去除具有快速、去除率高的特点。动力学实验数据符合准二级动力学模型，Langmuir 对热力学实验平衡数据的拟合较高，最大理论吸附容量为68.49 mg/g。通过方程拟合和SEM分析发现吸附过程发生了离子交换。FTIR分析显示，羟基、羧基等官能团在吸附过程中发挥了作用，通过解吸可以实现羊栖菜粉的再生和循环利用。
关键字: 羊栖菜；镉离子；环境因子；吸附机理；解吸
（1. College of Food Science and Technology, Agricultural University of Hebei, Baoding 071000, China;
2.Ocean College, Hebei Agricultural University, Qinhuangdao 066000, China）
Abstract:The adsorption characteristics of Cd2+ in aqueous solution were studied by using inactive Sargassum fusiforme(S.fusiforme)as adsorbent. The results show that the maximum removal rate of Cd2+ is 92.54% under condition of the optimum adsorption pH 5, the temperature 313.15 K, the concentration of adsorbent 1 g/L and the initial concentration of Cd2+ about 40 mg/L, and when the adsorption is carried out for 10 min, the maximum removal rate is 93.95%, the adsorption reaches equilibrium at 60 min. The removal of Cd2+ is rapid and the removal rate is high. The kinetic experiment data conforms to the quasi-second-order kinetics model, Langmuir has a high fitting degree for the equilibrium data of thermodynamic experiments, and the maximum theoretical adsorption capacity is 68.49 mg/g. By means of equation fitting and SEM analysis, it is found that the ion exchange occurs during the adsorption process. FTIR analysis show that hydroxyl, carboxyl and other functional groups play a role in the adsorption process. The regeneration and cyclic utilization of S.fusiforme can be achieved by desorption.
Key words: Sargassum fusiforme(S.fusiforme); Cd2+; environmental factor; adsorption mechanism; desorption
