title: Photocatalytic decolorization of soluble dyes by a bis-ions coexistence system of NH4(+) and NO3(-) with high photoreduction ability.
abstract: In this paper, we found that the acidic and basic dyes were easily decolorized by a bis-ions coexistence system of NH(4)(+) and NO(3)(-) under UV light irradiation. The coexistence of NH(4)(+) and NO(3)(-) is a necessary condition for the photocatalytic decolorization of soluble dyes. The photocatalytic decolorization of methyl orange (MO) and methylene blue (MB) follows the first order rate kinetics. The location of an absorption peak in the visible region is blue-shifted with the increase in the illumination time. It is proposed that the photocatalytic decolorization of soluble dyes in the bis-ions coexistence system of NH(4)(+) and NO(3)(-) is a photoreduction reaction, in which the ammonium nitrate acts as a photocatalyst. The chromophore of acidic and basic dyes reacts with hydrogen and then results in their rapid decolorization.
authors.affiliation: Department of Chemistry, Huaibei Normal University, Anhui, Huaibei 235000, People's Republic of China. chshifu@chnu.edu.cn
authors.forename: Chen
authors.initials: C
authors.lastname: Shifu
authors.forename: Liu
authors.initials: L
authors.lastname: Wei
authors.forename: Zhang
authors.initials: Z
authors.lastname: Huaye
authors.forename: Yu
authors.initials: Y
authors.lastname: Xiaoling
mesh_terms: D000465:Algorithms; D000641:Ammonia / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry; D016227:Benzoquinones / Q000737:chemistry; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry; D009566:Nitrates / Q000737:chemistry*; D010084:Oxidation-Reduction; D010777:Photochemistry; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001391:Azo Compounds; D016227:Benzoquinones; D004396:Coloring Agents; D009566:Nitrates; C004532:quinone; C100258:methyl orange; D000641:Ammonia; D006859:Hydrogen; D008751:Methylene Blue