Adsorptive and photocatalytic properties of Ag-loaded BiVO4 on the degradation of 4-n-alkylphenols under visible light irradiation
ABSTRACT Silver fine-particles loaded on BiVO4 photocatalyst by an impregnation method remarkably improve adsorptive and photocatalytic performance on the degradation of long-chain alkylphenols such as 4-n-nonylphenol (NP) and 4-n-octylphenol (OP). The Ag-loaded BiVO4 powders strongly adsorb NP and OP, which is attributable to silver oxides (Ag2O and/or AgO) partly covered on the silver surface. The specific adsorption property disappears when the surface silver oxides are reduced in a H2 stream. Degradation rates and CO2 mineralization yields for NP are increased by the Ag loading on BiVO4.
Article: Different photodegradation behavior of 4-tert-octylphenol under UV and VUV irradiation in aqueous solutionJournal of Photochemistry and Photobiology A Chemistry 01/2013; 251(1):69-77. · 2.42 Impact Factor
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ABSTRACT: Nonylphenols are water-stable endocrine disrupting compounds that inhibit the growth of sewage bacteria in biological processes. The study describes the decomposition of 4-n-nonylphenol (NP) in water by 20 kHz ultrasound with emphasis on the impacts of pH, concentration and OH scavengers. It was found that the rate of degradation was accelerated by alkalinization, but more so by the addition of hydroxide alkalinity than carbonate. The addition of low doses of CO(3)(2-) and t-butyl alcohol as strong scavengers of OH was also found to accelerate the decomposition of NP. The observation was attributed to the generation of reactive CO(3)(2-) and CH(3) via pyrolysis of the additives in the cavity bubbles. The results also revealed that NP did not compete with OH scavenging agents when their relative concentration was low. In case of high frequency sonication (861 kHz) the competition was slightly effective (slowed down degradation) at an identical dose of t-butyl alcohol. The difference was attributed to shorter bubble life time at high frequencies leading to less violent/less energetic bubble collapse and lower yield of CH(3).Journal of hazardous materials 08/2009; 172(2-3):739-43. · 4.14 Impact Factor