Adsorption and electrocatalytic degradation of 2,4,6-trichlorophenol by modified Pd/GAC particle electrode
A modified Pd/granular activated carbon(GAC)particle electrode was prepared via sodium borohydride reduction using HNO3(6 mol·L-1)and high-temperature(450 ℃)modified GAC as the carrier.The performance,kinetics and dechlorination mechanism of the electrode on 2,4,6-trichlorophenol(2,4,6-TCP)removal were studied.The results showed that after modification,the specific surface area and pore volume of GAC increased by 1.5 times(560.791 m2·g-1)and 36.02％,respectively,and the maximum adsorption capacity to 2,4,6-TCP correspondingly increased to 199.2 mg·g-1.Under the optimized conditions,the modified particle electrode removed about 94.7％of 2,4,6-trichloropropanol(30 mg·L-1)at a rate constant of 0.014 min-1 in 4 hours.The catalytic activity of Pd was determined as 0.3(min·mmol)-1.The 2,4,6-TCP removal process was elucidated via the analysis of the variation of organic chlorine and inorganic Cl-.The electrocatalytic dechlorination mechanism of the modified particle electrodes was explored from the reduction pathways,direct and indirect reduction contributions.
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