title: Novel iron metal matrix composite reinforced by quartz sand for the effective dechlorination of aqueous 2-chlorophenol.
abstract: In this work, we tested a novel iron metal matrix composite (MMC) synthesized by mechanically introducing quartz sand (SiO2) into an iron matrix (denoted as SiO2-Fe MMC). The pseudo-first-order reaction rate constant of the SiO2-Fe MMC (initial pH 5.0) for 20 mg/L of 2-chlorophenol (2-CP) was 0.051 × 10(-3) L/m(2)/min, which was even higher than that of some reported Pd/Fe bimetals. This extraordinary high activity was promoted by the quick iron dissolution rate, which was caused by the formation of Fe-C internal electrolysis from carbonization of process control agent (PCA) and the active reinforcement/metal interfaces during the milling process. In addition, pH has slight effect on the dechlorination rate. The SiO2-Fe MMC retained relatively stable activity, still achieving 71% removal efficiency for 2-CP after six consecutive cycles. The decrease in dechlorination efficiency can be attributed to the rapid consumption of Fe(0). A dechlorination mechanism using the SiO2-Fe MMC was proposed by a direct electron transfer from Fe(0) to 2-CP at the quartz sand/iron interface.
authors.affiliation: National Engineering Research Center for Urban Pollution Control, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, 200092 Shanghai, PR China; Department of Environmental Engineering, College of Chemistry and Environmental Engineering, Shenzhen University, 518060 Shenzhen, PR China.
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Environmental Engineering, College of Chemistry and Environmental Engineering, Shenzhen University, 518060 Shenzhen, PR China. Electronic address: boyang@szu.edu.cn.
authors.forename: Bo
authors.initials: B
authors.lastname: Yang
authors.affiliation: Department of Environmental Engineering, College of Chemistry and Environmental Engineering, Shenzhen University, 518060 Shenzhen, PR China.
authors.forename: Yanni
authors.initials: Y
authors.lastname: Han
authors.affiliation: Department of Environmental Engineering, College of Chemistry and Environmental Engineering, Shenzhen University, 518060 Shenzhen, PR China.
authors.forename: Chaojin
authors.initials: C
authors.lastname: Jiang
authors.affiliation: National Engineering Research Center for Urban Pollution Control, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, 200092 Shanghai, PR China.
authors.forename: Deli
authors.initials: D
authors.lastname: Wu
authors.affiliation: National Engineering Research Center for Urban Pollution Control, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, 200092 Shanghai, PR China. Electronic address: jinhongfan@tongji.edu.cn.
authors.forename: Jinhong
authors.initials: J
authors.lastname: Fan
authors.affiliation: National Engineering Research Center for Urban Pollution Control, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, 200092 Shanghai, PR China.
authors.forename: Luming
authors.initials: L
authors.lastname: Ma
mesh_terms: D002733:Chlorophenols / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D012822:Silicon Dioxide / Q000032:analysis; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002733:Chlorophenols; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide; D007501:Iron; C030683:2-chlorophenol
keywords: 2-Chlorophenol; Ball milling; Dechlorination; Iron metal matrix composite; Iron-carbon; Quartz sand