摘要
通过水热法制备了Ce-La-MOFs@Fe_(3)O_(4)复合材料,研究了Ce-La-MOFs@Fe_(3)O_(4)对水溶液中F^(-)的吸附性能,并通过响应曲面法优化了吸附条件。实验结果表明:在pH=3.6、实验温度为40℃、初始氟离子浓度为17.4 mg/L的条件下,Ce-La-MOFs@Fe_(3)O_(4)的吸附效果最佳,F^(-)去除率可达94.5%。除氟特性实验数据更适合用Langmuir模型进行描述,拟合得到最大吸附容量(q_(max))为147.23 mg/g,热力学参数ΔG^(o)、ΔH^(o)和ΔS^(o)表明该吸附反应是一个自发吸热的熵增过程。动力学研究表明Ce-La-MOFs@Fe_(3)O_(4)对F^(-)的吸附符合准二级反应动力学过程。对复合材料的形貌和结构进行了表征分析,并结合吸附热力学和动力学研究探讨了吸附机理,该吸附过程主要是离子交换和静电吸附共同作用。共存离子实验、循环再生实验结果显示,Ce-La-MOFs@Fe_(3)O_(4)对F^(-)具有较好的选择性,该复合材料的再生性能较好,回收率可达96%,两次循环后对F^(-)的去除率仍达81.74%。
In the present work,Ce-La-MOFs@Fe_(3)O_(4) composites were prepared via hydrothermal method,and the adsorption performance of Ce-La-MOFs@Fe_(3)O_(4)on F^(-)in aqueous solution was investigated,and the adsorption conditions were optimized by response surface method.The experimental results show that the best adsorption effect of Ce-La-MOFs@Fe_(3)O_(4)is achieved at pH=3.6,experimental temperature of 40℃,and initial fluoride ion concentration of 17.4 mg/L,and the F^(-)removal efficiency could reach 94.5%.The experimental datas of fluoride removal were more suitable to be described by Langmuir isotherm model,and the maximum adsorption capacity(q_(max))is 147.23 mg/g.The thermodynamic parametersΔG^(o),ΔH^(o)andΔS^(o)indicated that the adsorption reaction is anentropy-increasing process with spontaneous heat absorption,and kinetic study show that the adsorption of F^(-)by Ce-La-MOFs@Fe_(3)O_(4)is well fitted with the pseudo second order model.The morphology and structure of the composites were characterized and analyzed,and the adsorption mechanisms were explored in conjunction with the adsorption thermodynamic and kinetic studies,which were mainly a combination of ion-exchange action and electrostatic adsorption.The results of co-existing ion experiments and regeneration experiments show that Ce-La-MOFs@Fe_(3)O_(4)has ahigh selectivity for F^(-).And the regeneration perfor-mance of Ce-La-MOFs@Fe_(3)O_(4)is so excellent that the recovery rate can reach 96%.After two cycles,the removal efficiency still reached 81.74%of F^(-).
作者
宋江燕
翟涛
温倩
周融融
杨为森
简绍菊
潘文斌
胡家朋
SONG Jiangyan;ZHAI Tao;WEN Qian;ZHOU Rongrong;YANG Weisen;JIAN Shaoju;PAN Wenbin;HU Jiapeng(College of Environment and Safety Engineering,Fuzhou University,Fuzhou 350001,China;Fujian Provincial Key Laboratory of Eco-Industrial Green Technology,College of Ecological and Resources Engineering,Wuyi University,Wuyishan 354300,Fujian,China;College of Mathematics and Computer Science,Wuyi University,Wuyishan 354300,Fujian,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第4期38-44,共7页
Materials Reports
基金
国家自然科学基金(61903288)
福建省自然科学基金(2019J01829,2019J01830)
福建省教育厅项目(FBJG20210043)
南平市科技项目(2022-ZXHZ-002,N2020Z015)
武夷学院师生共创科研团队项目(2020-SSTD-05)。
