Reductive transformation of p-nitrophenol by Fe(II) species: the effect of anionic media.
Electron exchange between aqueous Fe(II) and structural Fe(III) of iron minerals has been illustrated for understanding the reduction of nitroaromatic compounds (NAC). However, factors influencing Fe(II)-induced the reduction of NAC still remain elusive. In this paper, p-nitrophenol (1.5mM) was selected to explore the effects of pH, the stabilizing ligands (Cl(-), SO4(2-)) of ferrous ions and the extra addition of iron hydroxide on the reduction of NAC via Fe(II) species. The results indicate that the reduction degree of is much lower in SO4(2-) medium than that in Cl(-) medium at pH 7.6. p-Nitrophenol reduction increased in SO4(2-) medium and slightly decreased in Cl(-) medium when Fe hydroxide was extra added. Cl(-) strength (0.01-0.1 mol L(-1)) has no obvious effect on p-NP reduction. SO4(2-) species and its dosage have markedly inhibitory effect on p-NP reduction due to the selective adsorption of SO4(2-) and the formation of sulphated surface complexes on the fresh Fe hydroxide.
Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China; University of Chinese Academy of Sciences, Beijing 100049, China; Huihua College of Hebei Normal University, Shijiazhuang 050091, China; Key Laboratory of Inorganic Nanomaterials of Hebei province, Hebei Normal University, Shijiazhuang 050086, China. Electronic address: yjwu76@163.com.
Yongjuan
Y
Wu
Lina
L
Geng
Xiaorui
X
Wang
Rufen
R
Chen
Yu
Y
Wei
Dong
D
Wu
D000327:Adsorption; D000838:Anions; D002712:Chlorides / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D004583:Electrons; D052918:Environmental Restoration and Remediation / Q000379:methods; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D008024:Ligands; D009596:Nitrophenols / Q000737:chemistry*; D010084:Oxidation-Reduction; D013431:Sulfates / Q000737:chemistry; D013499:Surface Properties; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000032:analysis; D014961:X-Ray Diffraction
D000838:Anions; D002712:Chlorides; D005290:Ferric Compounds; D007501:Iron; D008024:Ligands; D009596:Nitrophenols; D013431:Sulfates; D062065:Wastewater; D014874:Water Pollutants, Chemical; C000499:ferric oxide; C021024:ferric hydroxide; C024836:4-nitrophenol
Fe(II); Inhibitory effect; Mechanism; Sulfate; p-Nitrophenol