离子液体改性水滑石的制备及对孔雀石绿的吸附  

Preparation of ionic liquid modified hydrotalc and its adsorption of Malachite Green

作　　者：吴春来 彭传云 苗亚磊 曹嘉翔 高欣雨 WU Chunlai;PENG Chuanyun;MIAO Yalei;CAO Jiaxiang;GAO Xinyu(School of Environmental Engineering and Chemistry,Luoyang Institute of Science and Technology,Luoyang 471023,China)

机构地区：[1]洛阳理工学院环境工程与化学学院,河南洛阳471023

出　　处：《印染》2024年第9期69-75,共7页China Dyeing and Finishing

基　　金：河南省科技攻关计划项目(232102320080);河南省自然科学基金(232300420394)。

摘　　要：通过水热反应,一步合成了离子液体改性钴铁层状双金属氢氧化物(IL@Co/Fe-LDH)。利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)、热重分析仪(TGA)和全自动比表面及孔隙率分析仪(BET)对其微观结构和官能团特性进行表征。离子液体的改性增加了LDH表面活性位点,同时,由于离子液体的作用,部分LDH层板被破坏,呈孔状结构,增大了比表面积。孔雀石绿吸附试验显示,IL@Co/Fe-LDH的吸附量随温度升高而降低。吸附过程符合准二级动力学模型和Langmuir吸附等温模型,最大吸附量为282.48mg/g,高于常见吸附剂。热力学分析结果表明,IL@Co/Fe-LDH对孔雀石绿的吸附为自发进行的放热过程。5次吸附-解吸附循环后,材料对孔雀石绿的去除率仍高达87%,具有潜在的应用前景。Ionic liquid modified cobalt iron layered double hydroxide(IL@Co/Fe-LDH)is synthesized through hy-drothermal method,the material is characterized by SEM,XRD,FT-IR,TGA and BET.The modification with ionic liquid not only increases the active sites of LDH,but also increases the surface area of LDH,because part of the LDH layer is destroyed by ionic liquid and exhibits pore structure.The adsorption of Malachite Green(MG)onto IL@Co/Fe-LDH is investigated.The adsorption behavior of MG follows the pseudo-secondary kinet-ic model and Langmuir adsorption isothermal model.The maxium adsorption capacity is 282.48 mg/g which is higher than the common adsorbent.The thermodynamic analysis results show that the adsorption of IL@Co/Fe-LDH is a spontaneous exothermic process.After 5 adsorption-desorption cycles,the removal percentage of Malachite Green is still as high as 87%,and it has potential application prospects.

关 键 词：钴铁层状双金属氢氧化物 离子液体 改性 孔雀石绿 吸附 

分 类 号：TS199[轻工技术与工程—纺织化学与染整工程] X832[轻工技术与工程—纺织科学与工程]