全氟辛酸
化学
催化作用
解吸
人体净化
吸附
铂纳米粒子
铂族
膜
钯
无机化学
烷基
铂金
环境化学
核化学
有机化学
废物管理
工程类
生物化学
作者
Min Long,Welman C. Elias,Kimberly N. Heck,Yi Luo,YenJung Sean Lai,Yixin Jin,Haiwei Gu,J. R. Donoso,Thomas P. Senftle,Chen Zhou,Michael S. Wong,Bruce E. Rittmann
标识
DOI:10.1021/acs.est.1c06528
摘要
PFAAs (perfluorinated alkyl acids) have become a concern because of their widespread pollution and persistence. A previous study introduced a novel approach for removing and hydrodefluorinating perfluorooctanoic acid (PFOA) using palladium nanoparticles (Pd0NPs) in situ synthesized on H2-gas-transfer membranes. This work focuses on the products, pathways, and optimal catalyst conditions. Kinetic tests tracking PFOA removal, F- release, and hydrodefluorination intermediates documented that PFOA was hydrodefluorinated by a mixture of parallel and stepwise reactions on the Pd0NP surfaces. Slow desorption of defluorination products lowered the catalyst's activity for hydrodefluorination. Of the platinum group metals studied, Pd was overall superior to Pt, Rh, and Ru for hydrodefluorinating PFOA. pH had a strong influence on performance: PFOA was more strongly adsorbed at higher pH, but lower pH promoted defluorination. A membrane catalyst-film reactor (MCfR), containing an optimum loading of 1.2 g/m2 Pd0 for a total Pd amount of 22 mg, removed 3 mg/L PFOA during continuous flow for 90 days, and the removal flux was as high as 4 mg PFOA/m2/d at a steady state. The EPA health advisory level (70 ng/L) also was achieved over the 90 days with the influent PFOA at an environmentally relevant concentration of 500 ng/L. The results document a sustainable catalytic method for the detoxification of PFOA-contaminated water.
科研通智能强力驱动
Strongly Powered by AbleSci AI