Environmental Science Department, Faculty of Science, Port-Said University, Port-Said, Egypt.
Ecole des mines d'Alès, Centre des Matériaux des Mines d'Alès (C2MA), 6, avenue de Clavières, F-30319 Alès cedex, France.
Carbohydr Polym. 2015 Dec 10;134:190-204. doi: 10.1016/j.carbpol.2015.07.012. Epub 2015 Jul 22.
The removal of As(V) ions from aqueous solution was carried out using composite sorbents based on chitosan (as the encapsulating material) and Cu(OH)2 or CuO. The sorbents were characterized using SEM, EDX and Zeta potential analysis. Sorption uptake was highly dependent on pH, temperature, initial As(V) concentration and sorbent dosage (SD): the optimum initial pH for arsenic removal was found close to 4. The sorption isotherm was described by the Langmuir equation. The metal ion can be bound through two different sorption sites: one having a strong affinity for As(V) (probably Cu(OH)2 or CuO) and the other having a lower affinity (probably the encapsulating material). The uptake kinetics was well fitted by the pseudo-second order rate equation. The effect of temperature was also evaluated, verifying the endothermic nature of the sorption process. Arsenic elution was performed using a saline solution (30 g L(-1) NaCl) at pH 12. The recycling of the sorbent was tested, maintaining a removal efficiency and a metal recovery over 95% for five successive sorption/desorption cycles.
采用壳聚糖（作为包埋材料）和 Cu(OH)2 或 CuO 为基础的复合材料吸附剂从水溶液中去除 As(V) 离子。采用 SEM、EDX 和 Zeta 电位分析对吸附剂进行了表征。吸附量高度依赖于 pH 值、温度、初始 As(V)浓度和吸附剂剂量 (SD)：发现去除砷的最佳初始 pH 值接近 4。吸附等温线由 Langmuir 方程描述。金属离子可以通过两个不同的吸附位点结合：一个对 As(V)具有很强的亲和力（可能是 Cu(OH)2 或 CuO），另一个亲和力较低（可能是包埋材料）。吸附动力学很好地符合拟二级速率方程。还评估了温度的影响，验证了吸附过程的吸热性质。使用 pH 值为 12 的盐水溶液 (30 g L(-1) NaCl) 进行砷洗脱。测试了吸附剂的循环使用，在五个连续的吸附/解吸循环中保持了 95%以上的去除效率和金属回收率。
