改性Pd/GAC粒子电极吸附-电催化去除2,4,6-三氯苯酚OA北大核心CSTPCD
Adsorption and electrocatalytic degradation of 2,4,6-trichlorophenol by modified Pd/GAC particle electrode
以6 mol·L-1硝酸和450 ℃高温共同改性后的颗粒活性炭(granular activated carbon,GAC)为载体,采用硼氢化钠还原法制备了改性Pd/GAC粒子电极,研究了电极对2,4,6-三氯苯酚(2,4,6-trichlorophenol,2,4,6-TCP)的去除能力、动力学特征及脱氯机理.结果表明,通过改性,GAC的比表面积(560.791 m2·g-1)提高了 1.5倍,孔容提高了36.02％,对2,4,6-TCP的最大吸附容量为199.2 mg·g-1.在优化条件下,改性粒子电极4 h内对30 mg·L-1的2,4,6-TCP去除率达到94.7％,反应速率常数为0.014 min-1,钯的催化活性为0.3(min·mmol)-1.通过对反应过程中有机氯和无机氯变化的分析,阐明了改性Pd/GAC粒子电极强化去除2,4,6-TCP的过程.从还原途径、直接和间接还原贡献等方面探究了改性粒子电极电催化脱氯机理.
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.
张金珂;梁玉涵;吴玉超;吴晨达;陈吕军;刘宏远;颉亚玮
浙江工业大学土木工程学院,杭州 310023开源环境科技集团有限公司,杭州 311200清华大学环境学院,北京 100084
环境科学
粒子电极电催化脱氯2,4,6-三氯苯酚反应机理
particle electrodeelectrocatalytic dechlorination2,4,6-trichlorophenolreaction mechanism
《环境工程学报》 2024 (001)
79-90 / 12
国家自然科学基金面上资助项目(52070111;52170093);浙江省自然科学基金资助项目(LY22E080010)
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