title: Biochar supported nanoscale zerovalent iron composite used as persulfate activator for removing trichloroethylene.
abstract: Biochar (BC) supported nanoscale zerovalent iron (nZVI) composite was synthesized and used as an activator for persulfate to enhance the trichloroethylene (TCE) removal in aqueous solutions. The degradation efficiency of TCE (0.15mmolL(-1)) was 99.4% in the presence of nZVI/BC (4.5mmolL(-1), nZVI to BC mass ratio was 1:5) and persulfate (4.5mmolL(-1)) within 5min, which was significantly higher than that (56.6%) in nZVI-persulfate system under the same conditions. Owing to large specific surface area and oxygen-containing functional groups of BC, nZVI/BC enhanced the SO4(-) generation and accelerated TCE degradation. On the basis of the characterization and analysis data, possible activation mechanisms of the Fe(2+)/Fe(3+) (Fe(II)/Fe(III)) redox action and the electron-transfer mediator of the BC oxygen functional groups promoting the generation of SO4(-) in nZVI/BC-persulfate system were clarified.
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Jingchun
authors.initials: J
authors.lastname: Yan
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Han
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Weiguo
authors.initials: W
authors.lastname: Gao
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Song
authors.initials: S
authors.lastname: Xue
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. Electronic address: mfchen@issas.ac.cn.
authors.forename: Mengfang
authors.initials: M
authors.lastname: Chen
mesh_terms: D002606:Charcoal / Q000737:chemistry*; D005609:Free Radicals / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D012275:Oryza; D010084:Oxidation-Reduction; D013431:Sulfates / Q000737:chemistry; D013499:Surface Properties; D014241:Trichloroethylene / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D005609:Free Radicals; D013431:Sulfates; C540010:biochar; D002606:Charcoal; D014241:Trichloroethylene; D007501:Iron
keywords: Biochar; Degradation; Nanoscale zerovalent iron; Persulfate; Trichloroethylene