title: Photocatalytic degradation of p-nitrophenol on nanometer size titanium dioxide surface modified with 5-sulfosalicylic acid.
abstract: The surface of nanometer size TiO(2) was simply and fast modified by chemical adsorption in saturated solution of 5-sulfosalicylic acid. After surface modification, a stable, yellow surface complex was formed quickly, the wavelength response range of TiO(2) was expanded, it has obvious absorption in the region from 320 to 450 nm; the adsorption efficiency of p-nitrophenol (PNP) by TiO(2) was enhanced from 42% to 84%. The photocatalytic activity was tested on the degradation of PNP. The influences of catalyst and its dosage, pH value, and PNP concentration on the degradation were investigated. On optimal photodegradation conditions, including initial pH 4.0, PNP 5 mg l(-1), catalyst 100 mg, irradiation time 120 min with 160 W high-pressure mercury lamp, the degradation efficiency of PNP was increased from 40% to 88% after surface modification. Surface modification led not only to an increase in the light utilization, but also improved the surface coverage of PNP in comparison with the pure TiO(2). Both of these factors are crucial for the photocatalytic activity of heterogeneous photocatalysis, especially for photodegradation of benzenoid pollutants.
authors.affiliation: Zhangzhou Teachers College, Zhangzhou 363000, China. lishunxing@263.net
authors.forename: Shun-xing
authors.initials: SX
authors.lastname: Li
authors.forename: Feng-ying
authors.initials: FY
authors.lastname: Zheng
authors.forename: Xian-li
authors.initials: XL
authors.lastname: Liu
authors.forename: Feng
authors.initials: F
authors.lastname: Wu
authors.forename: Nan-sheng
authors.initials: NS
authors.lastname: Deng
authors.forename: Jian-hong
authors.initials: JH
authors.lastname: Yang
mesh_terms: D000327:Adsorption; D001557:Benzenesulfonates; D019817:Benzoic Acid / Q000737:chemistry; D002384:Catalysis; D009596:Nitrophenols / Q000737:chemistry* / Q000528:radiation effects; D010316:Particle Size; D010777:Photochemistry; D012459:Salicylates / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
chemical_list: D001557:Benzenesulfonates; D009596:Nitrophenols; D012459:Salicylates; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D019817:Benzoic Acid; D014025:Titanium; C003366:sulfosalicylic acid; C024836:4-nitrophenol