MIL-100(Fe^(Ⅱ)/Fe^(Ⅲ))/ACF复合材料的制备及光催化脱色性能  

Preparation and photocatalytic decolorization performance of MIL-100(Fe^(Ⅱ)/Fe^(Ⅲ))/ACF composites

作　　者：季青豪 范婷婷 王春梅[1] JI Qinghao;FAN Tingting;WANG Chunmei(School of Textile and Clothing,Nantong University,Nantong 226019,Jiangsu,China)

机构地区：[1]南通大学纺织服装学院,江苏南通226019

出　　处：《化工进展》2024年第10期5913-5921,共9页Chemical Industry and Engineering Progress

基　　金：江苏省研究生科研创新计划(KYCX19_2062);南通大学大学生创新训练计划(2022130)。

摘　　要：以七水合硫酸亚铁和无水硫酸铁为金属盐,均苯三甲酸为配体,活性碳纤维(ACF)为基材,在室温下采用原位生长法制备了MIL-100(Fe^(Ⅱ)/Fe^(Ⅲ))/ACF复合材料。研究了复合材料的制备工艺和应用工艺对活性艳蓝KN-R光催化脱色效果的影响,并探讨了其光催化脱色的机理。结果表明:Fe2+与Fe3+的摩尔比为3∶1,原位生长20h条件下制备的复合材料,在1000W氙灯光照下处理120min,对加入0.32mL/L H_(2)O_(2)、pH为3.0、浓度为80mg/L的活性艳蓝KN-R染液的脱色率可达97.1%以上,而且在染液pH=3.0~6.2的范围内脱色率均在95.8%以上,重复使用5次后脱色率有所降低,但仍然可达85.5%。通过自由基捕获实验,发现在光催化体系中起主要作用的是羟基自由基(·OH)和光生空穴(h+)。采用扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)对复合材料进行了表征,结果显示MIL-100(Fe^(Ⅱ)/Fe^(Ⅲ))成功负载在ACF上,与MIL-100(FeⅡ)/ACF相比,MIL-100(Fe^(Ⅱ)/Fe^(Ⅲ))/ACF的活性位点的结合能要高0.2~0.3eV。MIL-100(Fe^(Ⅱ)/Fe^(Ⅲ))/ACF composites were prepared by in-situ growth at room temperature using ferrous heptahydrate and anhydrous ferrous sulfate as metal salts,trimesic acid as ligand and active carbon fiber(ACF)as base material.The influence of the preparation and application processes of composites on the photocatalytic decolorization effect for reactive brilliant blue KN-R was studied and the mechanism of its photocatalytic decolorization was explored.The results showed that the decolorization rate of the composite,which was prepared by in-situ growth for 20h with the mole ratio of Fe2+to Fe3+of 3∶1 on 80mg/L reactive brilliant blue KN-R solution adding 0.32mL/L H_(2)O_(2)at pH 3.0 reached 97.1%under the condition of 1000W xenon light illumination and reacting for 120min.The decolorization rate was above 95.8%within the range of pH 3.0 to 6.2.After 5 times reuse,the decolorization rate was decreased but still could reach 85.5%.Through free radical capture experiments,it was found that hydroxyl radicals(·OH)and photo generated vacancies(h+)played the main role in the photocatalytic system.The composites were characterized by SEM,XRD,FTIR and XPS.The results indicated that MIL-100(Fe^(Ⅱ)/Fe^(Ⅲ))was successfully loaded on ACF.The active site binding energy of MIL-100(Fe^(Ⅱ)/Fe^(Ⅲ))/ACF was 0.2—0.3eV higher compared to MIL-100(FeⅡ)/ACF.

关 键 词：MIL-100(Fe) 活性碳纤维 染料降解 自由基 类芬顿反应 

分 类 号：X703.1[环境科学与工程—环境工程]