金属有机框架材料UiO-66-(COOH)2吸附去除染料废水中的亚甲基蓝和罗丹明B  

Adsorption and Removal of Methylene Blue and Rhodamine B from Dye Wastewater by Metal-Organic Framework UiO-66-(COOH)2

作　　者：生森森 刘佳祥 李卓[1] SHENG Sensen;LIU Jiaxiang;LI Zhuo(School of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学环境科学与工程学院,上海200092

出　　处：《西安交通大学学报》2020年第9期180-188,共9页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51676141);国家水体污染控制与治理科技重大专项资助项目(2017ZX07201001);中央高校基本科研业务费专项资金资助项目。

摘　　要：为提高对废水中阳离子染料亚甲基蓝(MB)和罗丹明B(RhB)的吸附性能,引入羧基基团,制备了表面带负电的金属有机框架材料UiO-66-(COOH)2。对所得样品进行了X射线衍射图谱分析、扫描电镜形貌分析、N2吸附脱附等温线分析、热重分析、傅里叶红外光谱分析。深入研究了UiO-66-(COOH)2对废水中MB和RhB两种染料的吸附性能和吸附机理。结果表明:由于静电作用的影响,引入羧基基团后的UiO-66-(COOH)2对MB和RhB的吸附性能均优于UiO-66的,分别超出32.4%和51.8%,且远高于活性炭吸附剂及其他羧基修饰材料的吸附量;UiO-66-(COOH)2在pH为3~10的范围内均具有较好的吸附性能,具有较强的pH适应性;吸附等温线拟合分析表明,UiO-66-(COOH)2对MB和RhB的吸附过程与Langmuir等温吸附模型吻合;吸附动力学拟合分析表明,UiO-66-(COOH)2对MB和RhB的吸附过程与准二级动力学方程吻合;经3次吸脱附循环后,UiO-66-(COOH)2对MB和RhB的吸附量分别减少了15.6%和22.5%,表明UiO-66-(COOH)2具有可再生循环使用潜力。To improve the adsorption capacity of cationic dyes methylene blue(MB)and rhodamine B(RhB)in wastewater,the negatively charged metal-organic framework(MOFs)material UiO-66-(COOH)2 was prepared by introducing carboxyl groups.The MOFs samples were carefully characterized by X-ray diffraction,scanning electron microscopy,N 2 absorption-desorption isotherm,thermogravimetric analyzer and Fourier transform infrared spectroscopy.The adsorption properties and mechanisms of UiO-66-(COOH)2 to MB and RhB in wastewater were deeply investigated.The results show that the effect of static electricity lead the adsorption properties of UiO-66-(COOH)2 improved by 32.4%and 51.8%respectively compared with UiO-66,and the adsorption properties are much higher than that of activated carbon and other carboxyl modified materials.In the pH range of 3-10,UiO-66-(COOH)2 exhibits better adsorption properties and stronger pH adaptability.Analyzing the fitted adsorption isotherms,the adsorption processes of UiO-66-(COOH)2 to MB and RhB are found to coincide with Langmuir isotherms as well as pseudo-second-order kinetic model.After three adsorption and desorption cycles,the adsorption of UiO-66-(COOH)2 to MB and RhB decreases by 15.6%and 22.5%respectively to indicate its potential for recycling and regeneration.

关 键 词：金属有机框架材料 UiO-66-(COOH)2 亚甲基蓝 罗丹明B 吸附 

分 类 号：X522[环境科学与工程—环境工程] X791