PDMDAAC功能化二氧化钛复合材料对金属离子吸附研究  

Adsorption of Metal Ions by Polydimethyldiallyl Ammonium Chloride Functionalized Titanium Dioxide Composite Materials

作　　者：姚培[1] 李树白[1] 张启蒙[1] 刘媛[1] 王鲁超 秦建国 YAO Pei;LI Shu-bai;ZHANG Qi-meng;LIU Yuan;WANG Lu-chao;QIN Jian-guo(School of Chemical and Pharmaceutical Engineering,Changzhou Vocational Institute of Engineering,Changzhou 213164,China;School of Petroleum Engineering,Changzhou University,Changzhou 213164,China;Shanghai Our ChemBio-Technology Co.,Ltd.,Shanghai 201506,China)

机构地区：[1]常州工程职业技术学院化工与制药工程学院,江苏常州213164 [2]常州大学石油工程学院,江苏常州213164 [3]上海沃凯生物技术有限公司,上海201506

出　　处：《化学试剂》2022年第12期1804-1809,共6页Chemical Reagents

基　　金：江苏高校“青蓝工程”优秀教学团队资助项目(苏教师函[2020]10号);江苏省高职院校教师专业带头人高端研修资助项目(苏高职培函[2020]10号);院级科技创新团队资助项目(2020)。

摘　　要：以钛酸四丁酯为前驱体,聚二甲基二烯丙基氯化铵(PDMDAAC)为改性剂,采用凝胶-溶胶法制备功能化二氧化钛,通过XRD、SEM和BET等方法对其性能进行表征。以金属离子Al^(3+)、Cr^(3+)、Cu^(2+)、Pb^(2+)为研究对象,研究了不同掺杂比及不同吸附参数对吸附率的影响。结果表明,当PDMDAAC物质的量比为钛酸四丁酯的0.2%时,20℃、pH 8.5、离子强度取NaCl质量浓度10%、10 mg功能化二氧化钛处理100 mg/L的混合废水中,5 min之内Al^(3+)、Cr^(3+)去除率可以达到99%以上,属于快吸附。Cu^(2+)、Pb^(2+)在50 min达到吸附平衡,去除率为99.5%,符合准二级动力学模型。混合金属离子的吸附存在竞争吸附。功能化二氧化钛重复可使用8次,吸附率仍能保持在84%以上。Tetra-butyl titanate was used as the precursor,the strong cationic electrolyte polydimethyldiallyl ammonium chloride(PDMDAAC)was used as a modifier,and PDMDAAC functionalized titanium dioxide was prepared by the gel-sol method.The properties of functionalized titanium dioxide were achieved by means of XRD,SEM and BET.The simulated wastewater of metal ions Al^(3+),Cr^(3+),Cu^(2+),and Pb^(2+)were the research objects,and the effects of different doping ratios and different adsorption parameters on the adsorption rate were studied.The results showed that the removal rate of Al^(3+)and Cr^(3+)could reach more than 99% within 5 min,when the amount ratio of PDMDAAC was 0.2%of tetra-butyl titanate,pH was 8.5,ionic strength was 10%,the dosage of functionalized titanium dioxide was 10 mg,and the mixed wastewater concentration of metal ion was 100 mg/L.The adsorption equilibrium of Cu^(2+)and Pb^(2+)reached at 50 min,and the corresponding removal rate was 99.5%,the kinetic model of which fitted with the pseudo-second-order model.During adsorption process,the adsorption of mixed metal ions has competitive adsorption.Functionalized TiO_(2) can be reused for 8 times,and its adsorption rate is still above 84%.

关 键 词：聚二甲基二烯丙基氯化铵 二氧化钛 金属离子 掺杂 吸附 

分 类 号：X703[环境科学与工程—环境工程]