Adsorption is the simplest and most effective method in organic wastewater treatment technology,but the adsorption performance of materials decreases dramatically at low temperatures (below 10℃).A series of SiO2@ZIF-67-based composites (SiO2@ZIF-67/GO,SiO2@ZIF-67/CNTs,SiO2@ZIF-67/MoS2) were prepared by introducing graphene oxide (GO),carbon nanotubes (CNTs) and molybdenum disulfide (MoS2) in SiO2@ZIF-67,and subjected to high-temperatures calcination.The structure of the composites was characterized by XRD,SEM,and nitrogen adsorption-desorption,and their adsorption properties for methyl orange at low temperature were studied.The results showed that after calcination,the composites were predominantly mesoporous structure and exhibited excellent adsorption properties.The specific surface area of SiO2@ZIF-67/GO(S) could reach 303m2/g,and its maximum saturation adsorption capacity for 100mg/L methyl orange solution at 5℃ was 332 mg/g,which was 2.9 and 4.4 times that of SiO2@ZIF-67/GO and activated carbon,respectively.The adsorption process of the composites was in accordance with the Freundlich model and the quasi-first order kinetic model,with physical adsorption dominating.
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基金资助
国家自然科学基金(21806122)
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