果胶钙凝胶球对苯甲的吸附性能研究.doc

目 录 摘要 3 1前言 5 2实验部分 6 2.1 仪器和试剂 6 2.2 实验方法 6 2.2.1苯甲酸的测定 6 2.2.2 果胶凝胶球的制备 6 2.2.3时间对果胶钙凝胶球吸附苯甲酸的影响 7 2.2.4凝胶球机械强度的测定方法 7 2.2.5 凝胶球的的洗脱与再生实验 7 2.2.6红外光谱分析 7 3 结果与讨论 7 3.1 时间对吸附量的影响 7 3.2 果胶浓度对吸附量的影响 8 3.3 Ca2+浓度对吸附量的影响 8 3.4 球径对吸附量的影响 9 3.5 不同温度下，苯甲酸浓度对吸附量的影响 9 3.6 果胶浓度对凝胶球机械强度的影响 10 3.7凝胶球的洗脱与再生实验 11 3.8 红外光谱分析 11 4 结论 11 参考文献 12 声明 13 致谢 14 果胶钙凝胶球对苯甲酸的吸附性能研究 李晓玲 （内江师范学院 化学化工学院， 四川 内江 641112） 摘 要：本文介绍了苯甲酸在现代工业中的重要性、概述了苯甲酸在食品工业和有机废水处理方的研究进展以及果胶作为吸附剂的应用进展。本实验将果胶用Ca2+交联制得果胶钙凝胶球。在此基础上，研究果胶钙凝胶球对苯甲酸的吸附性能，并用红外光谱初步表征了果胶凝胶球复合物的结构。分别了吸附时间、果胶浓度、Ca2+浓度、微球粒径、温度和苯甲酸浓度对吸附性能的影响及果胶凝胶球的再生能力。结果表明：在25℃下，果胶凝胶球对苯甲酸的吸附在3.5h左右达到平衡，当苯甲酸初始浓度为400μg/mL，果胶的质量分数为2.0%, CaCl2质量分数为2.0%时，吸附容量可达38.mg/mL。 关键字：果胶；凝胶；吸附；苯甲酸 Adsorption Capacity of Pectin Calcium Gel Microspheres for benzoic acid LIXiao-ling (Department of Chemistry and Chemistry Engineering , Neijiang Teachers College, Neijiang, Sichuan 641112, China) Abstract：This paper introduces the importance of benzoic acid in modern industry, gives an overview of benzoic acid in the food industry and organic methods of wastewater treatment progress, and overview the progress in the application of pectin as a sorbent. In this study, first of all, dissolving a certain amount of pectin in pure water, and further using Ca2 +crosslinking pectin to obtain pectin calcium gel beads. On this basis, study the adsorption of pectin gel beads of calcium on the acid, and characterize the structure of the pectin gel beads’ complexus through the IR spectrum initially. Adsorption time, pectin concentration, Ca2 + concentration, microsphere size, temperature and acid concentration were measured on the adsorption characteristics and regenerative capacity of pectin gel beads is also measured. The results showed that: at 25 ℃, the pectin gel beads on the adsorption of benzoic acid balance in about 3.5h, when the initially concentration of benzoic acid is 400μg/mL, pectin content is 2.0%, CaCl2 is 2.0 wt %, the adsorption capacity could achie