文章摘要
黄良仙,韩星星,牛育华,宋洁,王荣.聚乙烯醇/海藻酸钠双交联凝胶球的制备及其应用[J].精细化工,2021,38(7):0
聚乙烯醇/海藻酸钠双交联凝胶球的制备及其应用
Preparation and application of polyvinyl alcohol/sodium alginate double cross-linked gel beads
投稿时间:2020-12-21  修订日期:2021-02-23
DOI:
中文关键词: 凝胶球  吸附  MB  Pb(Ⅱ)  吸附机理
英文关键词: gel beads  adsorption  methylene blue  Pb(Ⅱ)  adsorption mechanism
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);陕西省科技厅农业领域项目;西安市“科技 ”行动计划-社会发展科技创新示范项目;榆林市科技计划项目
作者单位E-mail
黄良仙 陕西科技大学 huanglx@sust.edu.cn 
韩星星 陕西科技大学 hanxingxing3922@163.com 
牛育华 陕西科技大学  
宋洁 陕西科技大学  
王荣 陕西科技大学  
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中文摘要:
      将聚乙烯醇(PVA)、硼酸(H3BO3)、海藻酸钠(SA)和氯化钙(CaCl2)结合构筑双交联凝胶网络,并负载腐植酸钾(KHA)和钙基蒙脱土(MMT)纳米粒子,成功制备了一种双交联凝胶球(PVA/SA/KHA/MMT)。该凝胶球对亚甲基蓝(MB)染料和Pb(Ⅱ)表现出优异的去除效率。通过FTIR,XRD,TGA,SEM-EDS,Zeta电位分析和BET系统地表征了凝胶球的理化性质。结果表明,吸附过程遵循准二级动力学模型,实验数据与Langmuir模型吻合良好。在298 K时, MB和Pb(Ⅱ)的最大吸附容量(Qm)分别为725.42和375.64 mg/g。热力学结果表明,该凝胶球的吸附是自发,吸热的,并且是由系统总体熵的增加所驱动。FTIR和XPS结果表明,Pb(Ⅱ)的吸附过程主要是通过羧基的螯合实现,而MB的吸附则通过氢键和静电相互作用发生。吸附选择性实验表明,PVA/SA/KHA/MMT对MB和Pb(Ⅱ)具有较高的吸附选择性。经过5次循环使用后,凝胶球对MB和Pb(Ⅱ)仍表现出较高的去除率。
英文摘要:
      The double cross-linked network structure was formed by combining polyvinyl alcohol (PVA) and sodium alginate (SA) with boric acid (H3BO3) and calcium chloride (CaCl2), respectively. Potassium humate (KHA) and calcium-based montmorillonite (MMT) nanoparticles were loaded in it, so a double cross-linked gel beads (PVA/SA/KHA/MMT) were successfully prepared. The gel beads demonstrated excellent removal efficiency for methylene blue (MB) dye and Pb(Ⅱ). The physical and chemical properties of gel beads were systematically characterized by FTIR, XRD, TGA, SEM-EDS, zeta and BET. In addition, the adsorption process follows the pseudo-second-order kinetic model, and the experimental data was in good agreement with the Langmuir model. At 298 K, the maximum adsorption capacity (Qm) values of MB and Pb(Ⅱ) were 725.42 and 375.64 mg/g, respectively. The thermodynamic results showed that the adsorption process of the gel beads was spontaneous, endothermic, and driven by the increase of the overall entropy of the system. Meanwhile, the results of FTIR and XPS indicated that the adsorption mechanism of Pb(Ⅱ) was mainly through the chelation of carboxyl groups, while the adsorption of MB occurs through hydrogen bonding and electrostatic interaction. Furthermore, PVA/SA/KHA/MMT gel beads show excellent adsorption selectivity for MB and Pb(Ⅱ). Notably, it still showed a higher removal efficiency for (MB) and Pb(Ⅱ) after 5 cycles.
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