改性废弃皮革吸附剂的制备及对氟的吸附性能  

Preparation of GA-modified Leather Waste Adsorbent and Adsorption Performance for Fluoride

作　　者：曾雪[1,2] 罗学刚[1,2] 周建[2] 朱东生[1,2] 吴锫 林晓燕[1,2] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]西南科技大学生物质材料教育部工程研究中心,四川绵阳601010

出　　处：《环境科学与技术》2016年第1期153-159,164,共8页Environmental Science & Technology

基　　金：国家核能开发专项课题(13zg610301);国家自然科学基金(21406182)

摘　　要：将锆(Ⅳ)固化在通过乙醛酸改性的粒状废弃皮革上制备出新型氟离子吸附剂.采用SEM-EDX、XPS、FTIR等方法表征了其表面形貌及结构,研究了该吸附剂对溶液中氟离子(F-)的吸附特性并探索其吸附机理。结果表明:粒状废弃皮革与锆的最佳质量比为1∶2;对F-的吸附最佳p H=3;当p H为3,温度为25℃、F-的初始浓度为50 mg/L、吸附剂用量为0.5 g/L时,对F-的吸附量为49.72 mg/g,当吸附剂用量增加到3 g/L时,F-的去除率可达96%;该吸附剂对F-的吸附等温线符合Langmuir方程,吸附动力学可用准二级动力学模型描述,属化学吸附,F-以离子交换的形式代替-OH与吸附剂中的锆(Zr(Ⅳ))结合形成稳定的化学键,从而达到吸附水溶液中氟离子的目的。A novel sorbent for fluoride adsorption was prepared by immobilizing Zr （ IV ） on glyoxylic acid （GA）-modified granular leather waste （GLW）. The surface morphology and structure of adsorbent were characterized by SEM-EDX, XPS, FrlR to study characteristics of the adsorbent for fluoride and adsorption mechanism. The results indicated the optimal mass ratio of GLW/Zr（ IV ） was 1：2. The optimal pH of adsorption was 3. The adsorption capacity could reach 49.72 mg/g at pH of 3, temperature of 25 ℃, initial concentration of 50 mg/L, dosage of 0.5 g/L. While the dosage increased to 3 g/L, the removal efficiency of fluoride could reach to 96%. Adsorption process.could be well described by Langmuir model. The adsorption kinetic data were fitted well with pseudo-second-order model. Fluoride ion could combine with Zr（ IV ） on MGLW to develop a stable chemical bond by ion exchange, resulting in the removal of fluoride.

关 键 词：废弃皮革 乙醛酸改性 氟离子 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]