Study On The Adsorption Performance Of X-type Zeolite Synthesized From Coal Gangue And It’s Fenton Catalytic Performance Of Metal-loaded Catalyst

Coal gangue is a kind of kaolin with coal,which is the solid waste produced by coal in the process of mining.The accumulation of coal gangue not only occupies a lot of land but also pollutes the environment,which seriously affects human life.The comprehensive treatment of coal gangue has become an urgent problem,the development and utilization of coal gangue,so that the formation of high value-added products,is of great significance.In addition,with the acceleration of industrial modernization process,the factory is running at full capacity,resulting in many industrial wastewaters discharge.Therefore,water pollution gradually becomes a serious threat to ecological environment and human health.In the face of the above problems,this thesis used coal gangue,a solid waste in Inner Mongolia,as the raw material to provide the silicon and aluminum sources required for the synthesis of zeolite,prepared zeolite by alkali-soluble hydrothermal method,and added cetyltrimethylammonium bromide（CTAB）to synthesize mesoporous X-type zeolite,and used powder X-ray diffraction（XRD）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM）,X-ray photoelectron The physical and chemical properties of X-type zeolites were investigated by powder X-ray diffraction（XRD）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM）and X-ray photoelectron spectroscopy（XPS）.The experimental results showed that X-type zeolite has good adsorption performance on cationic dye crystalline violet,mainly due to its abundant negative charge,large specific surface area and complex and variable pore structure.Copper-based catalysts（Cu-X）were prepared by metal loading modification using mesoporous X-type zeolites as carriers for the Fenton-catalyzed degradation of the dyes methylene blue（MB）and rhodamine B（Rh B）.The optimal reaction conditions and reaction mechanism for the non-homogeneous Fenton-catalyzed reaction were also investigated.The results showed that copper existed in the surface structure of zeolites in the form of doped metal ions and metal oxides.And the participation of Cu⁺and Cu²⁺in the Fenton reaction was determined by the variation of their surface atomic ratios in the catalyst.the Cu-X catalyst performed well with a catalytic degradation rate of 99.7%and a total organic carbon test（TOC）removal rate of 97.8%.The mechanism was explored to know that·OH was the main reactive radical and the redox cycle of Cu⁺/Cu²⁺accelerated the generation of reactive radicals in the Fenton-like system,which promoted the degradation of methylene blue and was the rate control step of the true Fenton-like reaction.Cu/Fe-X-based catalysts（Cu/Fe-X）were prepared by loading mesoporous X-type zeolites with copper nitrate and iron nitrate to construct a catalytic system with dual reaction activity centers,which accelerated the electron migration cycle at the catalyst interface and effectively improved the catalytic activity under neutral conditions.The results showed that the obtained Cu/Fe-X catalyst had good catalytic activity for the dye rhodamine B.The p H range was wide（p H=1.00-10.00）,and the catalytic degradation rate reached 99.9%and the TOC removal rate reached 98.5%under the optimal conditions,and the catalyst was well recyclable.It was found that the redox cycle of Fe²⁺/Fe³⁺and Cu⁺/Cu²⁺,which greatly improved the catalytic activity of the catalyst,was the key in the Fenton-like reaction.Therefore,organic pollutants can be effectively removed in the Cu/Fe/H₂O₂ Fenton system.