(1. 河北農業(yè)大學 食品科技學院，保定 071000；
2. 河北農業(yè)大學 海洋學院，秦皇島 066000)
摘 要: 以非活性羊棲菜粉為吸附劑，研究羊棲菜對水溶液中Cd2+的吸附特性。結果發(fā)現：在最佳吸附pH為5，溫度為313.15 K，吸附劑濃度為1 g/L，Cd2+初始濃度為40 mg/L左右時，羊棲菜對鎘離子的去除率的最大值為92.54%，且吸附10 min時，即達到最大去除率93.95%；在60 min時，基本達到吸附平衡，羊棲菜對Cd2+的去除具有快速、去除率高的特點。動力學實驗數據符合準二級動力學模型，Langmuir 對熱力學實驗平衡數據的擬合較高，最大理論吸附容量為68.49 mg/g。通過方程擬合和SEM分析發(fā)現吸附過程發(fā)生了離子交換。FTIR分析顯示，羥基、羧基等官能團在吸附過程中發(fā)揮了作用，通過解吸可以實現羊棲菜粉的再生和循環(huán)利用。
關鍵字: 羊棲菜；鎘離子；環(huán)境因子；吸附機理；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
