title: Enhanced degradation of ortho-nitrochlorobenzene by the combined system of zero-valent iron reduction and persulfate oxidation in soils.
abstract: ortho-Nitrochlorobenzene (o-NCB) in soil poses significant health risks to human because of its persistence and high toxicity. The removal of o-NCB by both zero-valent iron (ZVI) and chemical oxidation (persulfate) was investigated by batch experiments. The o-NCB removal rate increases significantly from 15.1 to 97.3 % with an increase of iron dosage from 0.1 to 1.0 mmol g(-1). The o-NCB removal rate increases with the decrease of the initial solution pH, and a removal efficiency of 90.3 % is obtained at an initial pH value of 6.8 in this combined system. It is found that temperature and soil moisture could also increase the o-NCB removal rate. The o-NCB degradation rate increases from 83.9 to 96.2 % and from 41.5 to 82.4 % with an increase of temperature (15 to 35 °C) and soil moisture (0.25 to 1.50 mL g(-1)), respectively. Compared to the persulfate oxidation system and ZVI system, the persulfate-iron system shows high o-NCB removal capacity. o-NCB removal rates of 41.5 and 62.4 % are obtained in both the persulfate oxidation system and the ZVI system, while the removal rate of o-NCB is 90.3 % in the persulfate-iron system.
authors.affiliation: College of Sciences, Nanjing Agricultural University, Nanjing, 210095, China, 2011111010@njau.edu.cn.
authors.forename: Hai-bo
authors.initials: HB
authors.lastname: Xu
authors.forename: Dao-yuan
authors.initials: DY
authors.lastname: Zhao
authors.forename: Yu-jiao
authors.initials: YJ
authors.lastname: Li
authors.forename: Pei-ya
authors.initials: PY
authors.lastname: Liu
authors.forename: Chang-xun
authors.initials: CX
authors.lastname: Dong
mesh_terms: D002722:Chlorobenzenes / Q000032:analysis / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006801:Humans; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D012987:Soil; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D013431:Sulfates / Q000737:chemistry*; D013696:Temperature
chemical_list: D002722:Chlorobenzenes; D012987:Soil; D012989:Soil Pollutants; D013431:Sulfates; D007501:Iron