蛭石负载壳聚糖处理重金属铬的研究论文.doc

湖南化工职业技术学院 毕?业?论?文 课 题: 蛭石负载壳聚糖处理重金属铬的研究 院系名称: 应用化学系 专业班级: 工业分析与检验 学生姓名: 汤 妹 学 号: 201012010265 指导老师: 石 慧 2012年 12 月 04 日 摘 要 本课题研究的制备方法以及其应用壳聚糖在特定的条件下，能发生水解、烷基化、酰基化、羧甲基化、磺化、硝化、卤化、氧化、还原、缩合和络合等化学反应，可生成各种具有不同性能的壳聚糖衍生物，从而扩大了壳聚糖的应用范围。壳聚糖大分子中有活泼的羟基和氨基，它们具有较强的化学反应能力。蛭石价格低廉，我国是蛭石出产大国，蛭石有膨胀性阳离子交换性和吸附性通过实验制备复合吸附剂蛭石与壳聚糖的最佳质量比，，时间，探讨% 壳聚糖的1 % 醋酸溶液混合，制备了复合吸附剂，用于去除含铬废液中的Cr(Ⅵ)。最佳工艺条件是：壳聚糖与蛭石质量比为0.1，吸附剂用量为12g/L，吸附时间为60 min，pH 值为6-8，废液中 Cr(Ⅵ) 质量浓度不大于600mg/L，此工艺条件下，Cr(Ⅵ)的去除率为95 % 以上。复合吸附剂对铬离子的吸附行为符合Langmuir吸附等温式，蛭石负载壳聚糖复合吸附剂对铬离子的吸附符合一级动力学方程 关键词：壳聚糖 蛭石 复合吸附Title The vermiculite load chitosan treatment of chromium Abstract This research Chitosan vermiculite sorbent preparation method and its application in wastewater. Chitosan under specific conditions, can undergo hydrolysis, alkylation, acylation, carboxymethylation, sulfonation, nitration, halogenation, oxidation, reduction, condensation, and complexation and other chemical reactions, can generate a variety of different performance of chitosan derivatives, thereby expanding the range of applications of chitosan. The chitosan macromolecules reactive hydroxyl and amino groups, which have a strong chemical reaction capability. Vermiculite low prices, China is the producing countries vermiculite, vermiculite expansion, cation exchange and adsorption. Experimental preparation of composite adsorbent vermiculite with the best quality of chitosan ratio, pH value, initial concentration, adsorption time, dosage of chromium ion adsorption rate, and to investigate the adsorption mechanism. The 60-100 mesh vermiculite and degree of deacetylation of 84.88% chitosan 1% acetic acid solution mixed to prepare a composite adsorbent for the removal of Cr (VI) in the liquid waste containing chromium. The optimum conditions: the chitosan vermiculite mass ratio to 0.1, adsorbent dosage of 12 g / L, adsorption