Preparation And Catalytic Performance Of Activated Carbon/Cu₂O/CuO Composite Photocatalytic Materials

The adsorption method for processing low-concentration oil-containing organic wastewater has the problems of low efficiency,recovery and treatment difficulty in the later stage,so wastes a lot of manpower,material and financial resources.Combined with the method of photocatalytic degradation,a new type of floating composite photocatalytic material is prepared,which has both adsorption and photocatalytic degradation functions,which can solve the problem of low concentration of oil pollution,and will not cause waste of resources and secondary pollution.According to the disadvantages of the current application of photocatalyst,the prospect of exploring the combination of photocatalyst Cu₂O and activated carbon for water pollution treatment is broad.Activated carbon hydrophobic modification,using sodium borohydride?NaBH₄?,ammonia?NH₃·H₂O?,methyltrimethoxysilane?MTMS?as modifiers to modify the hydrophobicity of activated carbon,by controlling the amount of modifier added and composition ratio,adjust the hydrophobic angle of the material surface.The modified hydrophobic effect is MTMS>NH₃·H₂O>NaBH₄,the maximum contact angle reaches 73°.The modified activated carbon has enhanced hydrophobicity and does not affect its adsorption performance,as well as the loading and preparation of the photocatalyst.Activated carbon/Cu₂O/CuO composite photocatalytic materials were prepared by using copper?II?sulfate pentahydrate?CuSO₄·5H₂O?as the copper source,ascorbic acid vitamin C as the reducing agent,and ethylenediamine?C₂H₈N₂?as the etchant.By changing the amount of ethylenediamine,heat treatment time,heat treatment temperature,photocatalyst loading and other conditions to study the adsorption-photocatalytic degradation performance of composite photocatalytic materials.The degradation of methyl orange by the photocatalyst produced under optimal conditions reached 95.13%,and the degradation rate remained above 80%after six cycles of degradation experiments.Through DRS,EIS,IT,CV and other photoelectrochemical test characterization,studies have shown that the number of electron-hole separations and the carrier migration process are significantly improved compared to Cu₂O.Using thiourea as the S source into the activated carbon/Cu₂O/CuO composite photocatalytic material,an activated carbon/Cu₂O/S/CuO composite photocatalytic material was prepared.The effects of heat treatment temperature,thiourea dosage,and Cu₂O/S/CuO photocatalyst loading amount on the microstructure and adsorption-degradation performance of the composite material were analyzed.The introduction of S element changes the energy band width and ion migration resistance,reduces the recombination rate of photogenerated electrons and holes,and makes the photocatalytic activity of the activated carbon/Cu₂O/S/CuO composite photocatalytic material further increase compared to activated carbon/Cu₂O/CuO.