海藻酸钙-金属离子凝胶球的制备及其对Cr_2O_7^(2-)的吸附  

Preparation of Calcium Alginate Metal Ion Gel Beads and Its Adsorption of Cr_2O_7^(2-)

作　　者：徐敏虹[1] 曹枫[1] 唐培松[1] 王坤燕[1] 

机构地区：[1]湖州师范学院材料化学与化学系,湖州313000

出　　处：《材料导报》2013年第18期78-83,共6页Materials Reports

基　　金：浙江省自然科学基金(Y4100471);浙江省教育厅项目(Y200903866);湖州市自然科学基金(2012YZ04);湖州师范学院2013校级科研项目成果

摘　　要：对SA在氯化钙溶液中的成球特性进行了研究,并且添加铁、铝、铜等金属离子制备成SA-Ca-Fe等凝胶球。采用FTIR、TG等仪器对凝胶球的结构和形态进行了表征。凝胶球的颜色取决于金属离子,直径为3～4mm,含水率为94%～96%。研究了不同金属离子的SA-Ca凝胶球吸附Cr2O72-的特性。结果表明:反应3h后,SACa、SA-Ca-Co、SA-Ca-Ni凝胶球对Cr2O72-几乎没有吸附能力;SA-Ca-Cu、SA-Ca-Al凝胶球对Cr2O72-吸附能力较小,而SA-Ca-Fe凝胶球对Cr2O72-的去除率达到93%,准二级吸附动力学方程可很好地描述各类凝胶球的吸附过程。The balling property of calcium alginate （SA-Ca） which was prepared by sodium alginate （SA） in CaCl2 solution were studied,and SA-Ca-Fe gel beads were prepared by adding different metal ions onto SA-Ca,such as Fe3＋,AP＋,Cu2＋.The structure and morphology of calcium alginate gel beads were characterized by FTIR,TG,etc.The color of the beads depended on metal ion,the diameters of the beads were 3-4 rnm,and the moisture contents of the beads were 94％-96％.The adsorption capacities of different calcium alginate-metal ion gel beads to Cr2O72-have been studied.The results showed that SA-Ca,SA-Ca-Co,SA-Ca-Ni gel beads hardly had adsorption capacity of Cr2O72-after 3h reaction,SA-Ca-Cu,SA-Ca-Al gel beads had low adsorption capacity of Cr2O72-,and the removal ratio of Cr2O72-by SA-Ca-Fe gel beads was 93％.In addition,adsorption processes with various gel beads were described well with the pseudo-second-order adsorption kinetic equation.

关 键 词：海藻酸钙凝胶球 吸附 重铬酸根离子 动力学 

分 类 号：X703[环境科学与工程—环境工程]