科研之友
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摘要
A novel electrocatalytic and photoelectrocatalytic system were developed to realize one-pot conversion of organic pollutants into liquid fuels such as methanol(CH3OH) and ethanol(C2H5OH).The process combines the catalytic oxidation of organic pollutants with electrocatalytic reduction of CO2.In this step,4-NP and TC were mineralized to CO2,and then the CO2 was converted to CH3OH and C2H5OH by electrocatalytic and photoelectrocatalytic reduction using a flower-like CuO cathode.The experimental results show the destruction of 4-NP(60 mL,10 mg/L) can be as high as 99%.In addition,the yields of CH3OH and C2H5OH were 98.29 mmol/L and 40.95 mmol/L,respectively,which represents a conversion of 41.8% of 4-NP into liquid fuels;the electron efficiency was 73.1%.In addition,about 80% of TC was removed in the PEC process by BiOBr as a photoanode and CuO as photocathode against 39% and 63% removed in PC and EC processes,and the kinetic constants of them are estimated to be 0.418,0.211,and 0.286 h-1,respectively.Apparently,the results show the system of PEC has a synergistic effect between PC and EC for the degradation of TC.A mechanism was proposed to explain the electrocatalytic steps involved in the conversion of 4-NP and TC to CH3OH and C2H5OH and the synergetic effects between AOPs and electrocatalysis,photoelectrocatalytic.
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