聚苯乙烯磺酸钠@海藻酸钙软胶囊吸附溶液中重金属的研究
Study on Adsorption of Heavy Metals by Poly(Styrenesulfonic Acid)@CalciumAlginate Capsule
投稿时间:2018-03-07  修订日期:2018-05-29
DOI:
中文关键词: 海藻酸钠  聚苯乙烯磺酸钠  吸附    
英文关键词: sodium alginate  Poly(styrenesulfonic acid)  adsorption  Cu (II)  Cd (II)
基金项目:湖北省自然科学基金资助项目(2015CFB550)
作者单位E-mail
崔龙哲 中南民族大学 资源与环境学院 1716343774@qq.com 
万 思 中南民族大学 资源与环境学院  
刘 瑾 中南民族大学 资源与环境学院  
林晓宇 中南民族大学 资源与环境学院  
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中文摘要:
      采用滴定-固化包裹法制备得到以海藻酸钙(Alg)为壳,内包聚苯乙烯磺酸钠溶液(PSSA)的椭球状软胶囊(PSSA@Alg软胶囊),用其吸附溶液中的Cu(II)、Cd(II)。结果表明: PSSA@Alg软胶囊对溶液中Cu(II)、Cd(II)的吸附量随溶液pH升高而增大,吸附过程分为吸附剂表面吸附和固态海藻酸钙壳内缓慢扩散两个过程,吸附过程更符合拟二级动力学模型,分别在约240min和360min时达到吸附平衡;等温吸附数据与Langmuir模型拟合良好,25℃条件下,PSSA@Alg软胶囊对Cu(II)、Cd(II)的最大吸附量分别为143.92 mg.g-1和193.64mg.g-1;海藻酸钙上的羧基和聚苯乙烯磺酸钠上的磺酸基团在PSSA@Alg软胶囊吸附重金属离子的过程中起重要作用。
英文摘要:
      The functionalized soft capsule (PSSA @ Alg soft capsule) with calcium alginate shell and sodium polystyrene sulfonate (P-SSA) as inclusion was prepared by titration-curing method. And use it to adsorb the copper and cadmium ions in the solution.The res-ults showed that the adsorption capacity of Cu (II) and Cd (II) adsorbed by PSSA @ Alg soft capsule increased with the increase of so-lution pH. The adsorption process was divided into adsorbent surface adsorption and slow diffusion in the solid calcium alginate she-ll. The adsorption process was more in line with the pseudo-second order kinetic model and reached equilibrium at about 240 min an-d 360 min, respectively. The isothermal adsorption data fitted well to the Langmuir model, in condition of 25 ℃,the maximum adsor-ption capacity of Cu (II), Cd (II) adsorbed by the PSSA @ Alg soft capsule were 143.92mg.g-1 and 193.64mg.g-1, respectively. Th-e carboxyl groups on the calcium alginatethe and the chelating effect of sulfonic acid groups located on PSSA with heavy metal ion-s was the key to the increase of adsorption capacity.
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