巯基壳聚糖/活性炭复合功能膜的砷吸附性能研究  

Study on arsenic-adsorbing capacity of the sulfhydryl chitosan/active carbon functional membrane

作　　者：邹路易[1] 毛小庆 李磊 王玉如 吴婷婷 王海军 顾文秀 

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122 [2]江南大学化学与材料工程学院,江苏无锡214122

出　　处：《安全与环境学报》2013年第6期31-35,共5页Journal of Safety and Environment

基　　金：中央高校基本科研业务费专项资金项目(JUSRP211 A08)

摘　　要：将壳聚糖与具有大比表面积且对砷有一定吸附作用的活性炭复合、交联成膜,然后对膜中的壳聚糖进行改性,制备了一种绿色的砷吸附材料——巯基壳聚糖/活性炭复合功能膜。用红外光谱、有机元素分析和X射线衍射表征确证了壳聚糖的巯基化,用扫描电镜表征了其表面形态为多孔结构,比表面积较大。研究了巯基壳聚糖/活性炭复合功能膜对As（Ⅲ）和As（Ⅴ）的吸附性能,结果表明：巯基壳聚糖/活性炭复合功能膜对As（Ⅲ）和As（Ⅴ）均有非常高的吸附容量,分别为480 mg/g和357 mg/g;吸附性能受pH值的影响不大,在pH=2.0~9.0范围内,砷去除率均在90%以上,其中最佳pH范围为6.0~8.0,尤其适用于饮用水中砷的处理;当水源中含有不超过砷含量60倍的HCO-3、10倍的Cl-和10倍的PO3-4时不影响砷的去除率;重复使用10次后,该功能膜对As（Ⅲ）和As（Ⅴ）的吸附性能均无明显降低。将吸附有砷的功能膜浸入饱和硫化钠溶液中,温和搅拌2 h,去离子水洗涤,可使膜再生,再生方法简单易行。The present paper is engaged in a study of the arsenicad sorbing capacity of suliydryl chitosan/active carbon functional mem brane. As is known, the said functional membrane is a green arsenic adsorbing chemical compound, which can be synthesized by blending sulfhydryl chitosan and active carbon to form a membrane as the re sult of a crosslinking reaction and a sulfidation reaction to chitosan in it. The successful sulfhydryl functionalization of chitosan to form a suLfhydryl chitosan/active carbon composite can be confirmed through the analysis of the infrared spectroscopy, the organic element analysis and Xray powder diffraction. The result of scanning with an electron ic microscope helps to reveal the porous surface structure with a large surface area of the functional membrane. And, next, we have suc cessfully tested the removing capacity of the membrane of As（III）and As（V）. The results of our study with the functional membrane ofsulfllydryl chitosan/active carbon composite verify that the functional membrane enjoys a very high capacity to adsorb As（III） and As（V）. To be accurate, the maximum adsorption capacities of the membrane are 480 mg/g and 357 mg/g respectively, moreover, its capacities can hardly be affected by the pH value. In the range of pH 2.0 9.0, the removal efficiency of As（IID and As（V） by the functional membrane can be made as high as over 90% with the optimal pH range of 6.0 8.0. The membrane proves to be especially suitable for removing As （III ） and As （ V ） in the drinking water. What is more, no effects can be found on the removal efficiency in the pres ence of HCO3 not beyond 60 times of arsenic, 10 times of C1 and PO of arsenic. Besides, the functional membrane can also be used to adsorb As （III） and As （ V）, while its function can be well kept with no remarkable decline even after it was reused for 10 times. What is more precious, the function of the membrane saturated by adsorption of arsenic can be regenerated by being immersed into satu rated

关 键 词：环境工程学 壳聚糖 活性炭 巯基化 功能膜 砷 

分 类 号：X52[环境科学与工程—环境工程]