明胶/聚乙烯胺凝胶珠的制备及其对Cr(Ⅵ)/Cu(Ⅱ)的吸附性能  

Preparation of GE/PVAm Gel Beads and its Adsorption to Cr(Ⅵ)/Cu(Ⅱ)

作　　者：刘素清 修绍迪 王玉路[2] 张斐斐 靳丽强[2] LIU Suqing;XIU Shaodi;WANG Yulu;ZHANG Feifei;JIN Liqiang(Leather Industry Research Institute of Shandong Province,Jinan 250021,China;School of Light Industry and Engineering,Qilu University of Technology Shandong Academy of Sciences,Jinan 250353,China)

机构地区：[1]山东省皮革工业研究所,山东济南250021 [2]齐鲁工业大学(山东省科学院)轻工科学与工程学院,山东济南250353

出　　处：《皮革科学与工程》2021年第4期22-26,34,共6页Leather Science and Engineering

基　　金：国家自然基金项目(22078165);山东省重点研发计划(2019GGX102028)。

摘　　要：以明胶(GE)和两性聚乙烯胺(PVAm)为原料,以戊二醛为交联剂,制备了明胶/两性聚乙烯胺(GE/PVAm)凝胶珠,用于去除水中的Cu(Ⅱ)和Cr(Ⅵ)。采用傅里叶红外光谱仪(FT-IR)分析了GE/PVAm的化学基团结构信息,用扫描电镜(SEM)观察了GE/PVAm的微观结构。吸附实验结果表明,GE/PVAm去除铜离子的最佳p H为6,最大吸附容量分20.44 mg/g;去除六价铬离子的最佳p H为2,最大吸附容量分别18.41 mg/g。吸附热力学研究表明,GE/PVAm对Cu(Ⅱ)的吸附行为可使用Langmuir吸附等温线模型描述,而Freundlich吸附等温线模型可更好地解释Cr(Ⅵ)在GE/PVAm上的吸附行为;Cu(Ⅱ)及Cr(Ⅵ)的吸附动力学均符合准二级动力学模型。A novel gel beads(GE/PVAm) composed with gelatin and amphoteric polyvinylamine and cross-linked by glutaraldehyde were prepared in order to remove Cu(II) and Cr(Ⅵ) from water. The chemical structures of GE/PVAm were characterized by FT-IR and its microtopography was investigated by SEM. The optimum pH values for removing of Cu(Ⅱ) was at 6 with a maximal adsorption capacity of 20.44 mg/g, while the optimum pH for Cr(Ⅵ) was at 2 with a maximal adsorption capacity of 18.41 mg/g. The adsorption of Cu(Ⅱ) on GE/PVAm was well fitted by Langmuir adsorption isotherm model, while the adsorption of Cr(Ⅵ) on GE/PVAm was described well by Freundlich adsorption isotherm model. Their adsorption kinetics can be described well by the pseudo-second-order model.

关 键 词：明胶 两性聚乙烯胺 Cr(Ⅵ) Cu(Ⅱ) 吸附 

分 类 号：X52[环境科学与工程—环境工程]