壳聚糖固定化技术及吸附性能的研究

Study of the immobilization technology and adsorption property of chitosan

采用海藻酸钠、聚乙烯醇、明胶作为载体,对壳聚糖的固定化条件进行了研究,并以制成的固定化壳聚糖吸附水中Cu2+和Cr6+。结果表明:分别用2%(质量分数,下同)的海藻酸钠、(1%的聚乙烯醇+1%的海藻酸钠)、(1%的明胶+1%的海藻酸钠)固定壳聚糖,成球性及机械性能理想。比较了壳聚糖质量、pH值、吸附时间对吸附效果的影响:0.20 g壳聚糖与(1%的聚乙烯醇+1%的海藻酸钠)载体混合,溶液pH值为6.5,吸附时间为8 h,Cu2+去除率达99.89%;0.15 g壳聚糖与(1%的聚乙烯醇+1%的海藻酸钠)载体混合,溶液pH值为4.5,吸附时间为10 h,Cr6+去除率达98.64%。

This paper investigates the conditions of immobilization of chitosan adopting sodium alginate, poly （vinyl alcohol） and glutin as carriers, and farther uses the immobilized chitosan to adsorb the Cu（ Ⅱ ）and Cr（ Ⅵ）in water. The results show that when individually using 2 % （w/w） sodium alginate, 1% poly （vinyl alcohol） （w/w） ＋ 1% （w/w） sodium alginate, 1% （w/w） glutin ＋ 1% （w/w） sodium alginate to immobilize chitosan, the glomeration and mechanical performance of the immobilized chitosan were the best. It also tests the effects of quality of chitosan, pH and the time of adsorption on the effectivity of adsorption. The results indicate that when 0. 20 g chitosan was mixed with 1% poly （vinyl alcohol） （w/w） ＋ 1% sodium alginate （w/w）, pH was 6.5 and the time of adsorption was 8 h, 99.89% Cu （ Ⅱ ） was removed; when 0.15 g chitosan was mixed with 1% poly （vinyl alcohol） （w/w） ＋ 1% sodium alginate （w/w）, pH was 4.5 and the time of adsorption was 10 h, 98.64% Cr （Ⅵ） was removed.