Electrocatalytic hydrodechlorination of 4-chlorobiphenyl in aqueous solution using palladized nickel foam cathode.
The electrocatalytic hydrodechlorination of 4-chlorobiphenyl on palladized nickel foam with high porous structure in an aqueous solution containing MeOH, bromide of hexadecyltrimethylammonium (CTAB), sodium acetate, and acetic acid were investigated in a membrane-separated flow-through cell. The Pd/Ni foam electrode was prepared by electroless deposition method, on which the Pd particles dispersed finely over Ni foam surface indicated by SEM-EDX analysis. The effects of current density, organic cosolvent, initial concentration, temperature, and flow rate on the hydrodechlorination of 4-chlorobiphenyl were examined. Methanol was among the best cosolvents and was used in preferential concentration of 50 vol%. Moderate current density (e.g., 2.23 mA cm(-2)), relatively high initial concentration, temperature, and flow rate were beneficial to improve the hydrodechlorination of 4-chlorobiphenyl. The current efficiencies for the conversion of 1mM 4-MCB decreased with increasing current density and range from 37.2% at 0.74 mA cm(-2) to 14.1% at 5.21 mA cm(-2) after 20 min electrolysis cut. Under the optimized conditions, 1mM of 4-MCB could be removed rapidly with the rate of 94.6% after 2h electrolysis, which gave current efficiencies and energy consumptions in range of 8.1-24.6% and 1.7-5.2 kW h kg(-1), respectively.
Yang
Bo
B
Department of Environmental Science and Engineering, POPs Research Centre, Tsinghua University, Beijing 100084, PR China.
Yu
Gang
G
Shuai
Danmeng
D
D001713:Biphenyl Compounds / Q000737:chemistry*; D002384:Catalysis; D004563:Electrochemistry; D009532:Nickel / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D012996:Solutions; D012997:Solvents; D013696:Temperature; D014867:Water
D001713:Biphenyl Compounds; D012996:Solutions; D012997:Solvents; D014867:Water; D010165:Palladium; D009532:Nickel; C006983:4-chlorobiphenyl