金属有机框架(MOFs)材料具有孔隙率高、比表面积大和大量的未饱和金属中心以及均匀可调的孔等优点,使其作为一类催化材料具有良好的发展前景。通过简单水热法合成了复合催化剂MIL-101(Fe)/Mn-ZSM-5;采用X射线衍射仪、扫描电子显微镜、X射线光电子能谱、傅里叶红外光谱仪及热重分析对催化剂的晶体结构、表面形貌和热稳定性进行分析,并研究其在催化湿式过氧化氢氧化技术(CWPO)下对酸性大红GR的降解效果和机理。结果表明:MIL-101(Fe)/Mn-ZSM-5晶体结构完整、结晶度良好、并呈现典型的八面体几何结构;催化剂投加量为0.2g、H2O2投加量为0.7mL、初始pH为3、温度为70℃时,反应20min,酸性大红GR的降解率达到95.6%;3次循环实验后,MIL-101(Fe)/Mn-ZSM-5催化剂对酸性大红GR的降解率仍达到90.3%,具有良好的稳定性。因此,MIL-101(Fe)/Mn-ZSM-5降解酸性大红GR染料废水具有良好的应用前景。
Metal-Organic Frameworks (MOFs) materials have a prosperous development prospect as a kind of catalytic materials for its advantages of high porosity,large specific surface area,a large number of unsaturated metal centers as well as uniform and adjustable pores.This paper successfully synthesized the composite catalyst MIL-101 (Fe)/Mn-ZSM-5 by simple hydrothermal method.It analyzed the crystal structure,surface morphology and thermal stability of the catalyst by means of XRD,SEM,XPS,FT-IR and TG.It also studied the degradation effect and mechanism of acid scarlet GR by catalytic wet hydrogen peroxide oxidation (CWPO).The results showed that the crystal structure of MIL-101(Fe)/Mn-ZSM-5 was complete,with perfect crystallinity and a typical octahedral geometry.When the dosage of catalyst was 0.2g,the dosage of H2O2 was 0.7mL,the initial pH was 3 and the temperature was 70℃,the degradation rate of acid scarlet GR reached to 95.6% for 20min.After three cycles of experiments,the degradation rate of acid scarlet GR by MIL-101(Fe)/Mn-ZSM-5 catalyst still achieved 90.3%,indicating that it possessed good stability.The above results revealed that MIL-101(Fe)/Mn-ZSM-5 had a favorable prospect in the degradation of acid scarlet GR dye wastewater.
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基金资助
国家自然科学基金(21966021)
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