title: Removal of perfluorinated carboxylates from washing wastewater of perfluorooctanesulfonyl fluoride using activated carbons and resins.
abstract: Perfluorooctanesulfonyl fluoride (PFOSF) washing wastewater contains high concentrations of perfluorinated carboxylates (PFCAs) including perfluorohexanoate (PFHxA, 0.10 mmol/L), perfluoroheptanoate (PFHpA, 0.11 mmol/L), and perfluorooctanoate (PFOA, 0.29 mmol/L). For the first time, we investigated the removal of these PFCAs from actual wastewater using the bamboo-derived activated carbon (BAC) and resin IRA67. Adsorption kinetics, effects of adsorbent dose, solution pH, and inorganic ions, as well as regeneration and reuse experiments were studied. The removal percents of three PFCAs by BAC and IRA67 followed the increasing order of PFHxA < PFHpA < PFOA, but the adsorption equilibrium time conformed to the reverse trend. PFCAs removal on IRA67 decreased with increasing pH, but BAC almost kept stable PFCAs removal at pH above 5.0. Among competitive adsorption of three PFCAs, PFOA was preferentially adsorbed on both BAC and IRA67. PFCAs removal from actual wastewater by BAC was higher than that in simulated solution, due to the presence of high concentration of inorganic ions in the wastewater. However, the co-existing organic compounds in wastewater significantly suppressed the adsorption of PFCAs. Both spent BAC and IRA67 were successfully regenerated by ethanol solution or NaCl/methanol mixture, and IRA67 showed the stable removal of PFCAs in five adsorption cycles.
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Ziwen
authors.initials: Z
authors.lastname: Du
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: dengshubo@tsinghua.edu.cn.
authors.forename: Shubo
authors.initials: S
authors.lastname: Deng
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Youguang
authors.initials: Y
authors.lastname: Chen
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Huang
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Yujue
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Yu
mesh_terms: D000327:Adsorption; D002210:Caprylates / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry*; D005466:Fluorocarbons / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D012996:Solutions; D013450:Sulfones / Q000737:chemistry; D014865:Waste Disposal, Fluid; D062065:Wastewater; D014873:Water Pollutants / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
chemical_list: D002210:Caprylates; D002244:Carbon; D002264:Carboxylic Acids; D005466:Fluorocarbons; D007477:Ions; D012996:Solutions; D013450:Sulfones; D062065:Wastewater; D014873:Water Pollutants; D014874:Water Pollutants, Chemical; C023036:perfluorooctanoic acid
keywords: Activated carbon; Competitive adsorption; PFOA; PFOSF washing wastewater; Resin