| Photocatalysis,sonocatalysis and piezocatalysis are used as effective advanced oxidation methods for environmental remediation,degradation of organic pollutants and production of hydrogen（H2）,a clean energy source.Therefore,the development of low-cost,stable and non-toxic catalysts has become the focus of research.As a simple and readily available metal coordination compound,[Ni（DMG）2]（nickel-dimethylglyoxime）is considered as a promising catalyst due to its unique tubular structure,high stability and narrow band gap（1.1-1.8 e V）.However,due to the low electron mobility,there are few studies on photocatalysis,ultrasonic catalysis and piezoelectric catalysis.In this paper,nickel-dimethylglyoxime and its composite materials are taken as the research object to explore their catalytic performance.The main research contents are as follows:（1）Mn3O4/[Ni（DMG）2]composites were prepared by one-step hydrothermal method.The structure,morphology,optical and electrochemical properties of Mn3O4/[Ni（DMG）2]composites were systematically studied by multiple characterization methods.Methylene blue（MB）and acid red A were selected as the target dyes to study the photocatalytic performance of the material under visible light.The results showed that the photocatalytic performance of the product was the best when the molar ratio of Mn/Ni was 40%.（2）GO/[Ni（DMG）2]composites were prepared by simple low temperature aqueous solution method by adjusting different graphene content.Characterization tests showed that GO was successfully loaded on[Ni（DMG）2],thus enlarging the specific surface area and enhancing the light capture capability in the visible region.Tetracycline（TC）and methylene blue（MB）were selected as the target dyes,and the photocatalytic,sonocatalytic and sonotophotocatalytic activities properties of the material were investigated under visible and ultrasonic radiation,respectively.The results showed that when the amount of graphene was 50 mg,the photocatalytic efficiency of the sample was the best,and the degradation rate of TC and MB could reach 95.6%and 99.1%within 60 min,respectively.This is attributed to the synergy between acoustic catalysis and photocatalysis,which makes the activity of acoustic and photocatalysis higher than the other two methods.（3）BiOI/[Ni（DMG）2]composites with different mole ratios were prepared using Ni（NO3）2·6H2O as nickel source by low temperature aqueous solution method.A series of physical characterization were used to analyze the phase,morphology and chemical composition of the composites.The sonocatalytic activity of the samples was evaluated by the degradation of tetracycline hydrochloride（HTC）under ultrasonic radiation and the optimal loading was found.The results show that the level barrier construction of Bi OI/[Ni（DMG）2]composite can effectively inhibit the electron-hole pair recombination,and the sonocatalytic catalytic activity is significantly enhanced.（4）ZnO/[Ni（DMG）2]composites were prepared by low temperature aqueous solution method,and the results of XRD,SEM,BET and other tests proved that Zn O successfully synthesized with[Ni（DMG）2].The photocatalytic and piezocatalytic hydrogen evolution abilities under visible and ultrasonic radiation were investigated.The results show that when the Zn/Ni value is 30%,the hydrogen evolution ability of the sample is the best.Under visible and ultrasonic radiation,it can reach 1799.22μmol·g-1·h-1 and 445.68μmol·g-1·h-1 respectively.The photocurrent and piezoelectric current tests further prove that the photocatalytic hydrogen evolution ability is slightly greater than that of piezocatalysis. |
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