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Sun J.,Shandong Polytechnic University | Yi C.-L.,University of Jinan | Zhao R.-S.,Shandong Academy of Sciences | Wang X.,Shandong Academy of Sciences | And 4 more authors.
Journal of Separation Science | Year: 2012

A sensitive and efficient analytical method for triclosan (TCS) determination in water, which involves enrichment with bamboo-activated charcoal and detection with HPLC-ESI-MS, was developed. The influence of several operational parameters, including the eluant and its volume, the flow rate, the volume andacidity of the sample, and the amount of bamboo-activated charcoal, were investigated and optimized. Under the optimum conditions, linearity of the method was observed in the range of 0.02-20 μg/L, with correlation coefficients (r2) >0.9990. The limit of detection was 0.002 μg/L based on the ratio of chromatographic signal to baseline noise (S/N = 3). The spiked recoveries of TCS in real water samples were achieved in the range of 97.6-112.5%. The proposed method was applied to analyze TCS in real aqueous samples. All the surface water samples collected in Xiaoqing River had detectable levels of TCS with concentrations of 42-197 ng/L. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Ding S.-L.,University of Science and Technology of China | Wang X.-K.,University of Science and Technology of China | Wang X.-K.,Shandong Key Laboratory of Cleaner Production and Reuse of Industrial Waste | Jiang W.-Q.,University of Science and Technology of China | And 6 more authors.
Environmental Science and Pollution Research | Year: 2015

The photolysis of the antimicrobial triclocarban (TCC) in aqueous systems under simulated sunlight irradiation was studied. The effects of several abiotic parameters, including solution pH, initial TCC concentration, presence of natural organic matter, and most common inorganic anions in surface waters, were investigated. The results show that the photolysis of TCC followed pseudo-first-order kinetics. The TCC photolysis rate constant increased with increasing solution pH and decreasing the initial TCC concentration. Compared with the TCC photolysis in pure water, the presence of aqueous bicarbonate, nitrate, humic acids, and its sodium salt decreased the TCC photolysis rate, but fulvic acid increased the TCC photolysis rate. The electron spin resonance and reactive oxygen species scavenging experiments indicated that TCC may undergo two different types of phototransformation reactions: direct photolysis and energy transfer to generate 1O2. The main degradation products were tentatively identified by gas chromatography interfaced with mass spectrometry (GC-MS), and a possible degradation pathway was also proposed. © 2014, Springer-Verlag Berlin Heidelberg. Source


Wang X.-K.,Shandong Polytechnic University | Wang X.-K.,Shandong Key Laboratory of Cleaner Production and Reuse of Industrial Waste | Wang C.,Shandong Polytechnic University | Wang C.,Shandong Key Laboratory of Cleaner Production and Reuse of Industrial Waste | And 4 more authors.
Chemical Engineering Journal | Year: 2012

Chlorine-doped anatase titanium dioxide (TiO 2) nanocrystallites were prepared via a simple single-step method by sonicating a solution of tetraisopropyl titanate and sodium chloride in water/ethanol at 70°C. The as-prepared sample was characterized using X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and ultraviolet-visible spectroscopy. The presence of the chloride dopant is confirmed by the Cl 2p XPS peak with a binding energy of 198.2eV, which is assigned to the anionic Cl incorporated into TiO 2. Cl-doping of TiO 2 shifts the absorption edge toward a higher wavelength. The as-prepared samples were successfully used in the photodegradation of aqueous butyl benzyl phthalate (BBP) under visible light irradiation. The photodegradation rates of BBP reached 92% under visible light irradiation for 240min. BBP mineralization was also realized by further increasing the irradiation time. © 2012 Elsevier B.V.. Source


Ding S.-L.,Shandong Polytechnic University | Ding S.-L.,Shandong Key Laboratory of Cleaner Production and Reuse of Industrial Waste | Wang X.-K.,Shandong Polytechnic University | Wang X.-K.,Shandong Key Laboratory of Cleaner Production and Reuse of Industrial Waste | And 8 more authors.
Environmental Science and Pollution Research | Year: 2013

This work aimed to investigate the effectiveness of ultraviolet (UV) radiation on the degradation of the antimicrobial triclocarban (TCC). We investigated the effects of several operational parameters, including solution pH, initial TCC concentration, photocatalyst TiO2 loading, presence of natural organic matter, and most common anions in surface waters (e. g., bicarbonate, nitrate, and sulfate). The results showed that UV radiation was very effective for TCC photodegradation and that the photolysis followed pseudo-first-order kinetics. The TCC photolysis rate was pH dependent and favored at high pH. A higher TCC photolysis rate was observed by direct photolysis than TiO2 photocatalysis. The presence of the inorganic ions bicarbonate, nitrate, and sulfate hindered TCC photolysis. Negative effects on TCC photolysis were also observed by the addition of humic acid due to competitive UV absorbance. The main degradation products of TCC were tentatively identified by gas chromatograph with mass spectrometer, and a possible degradation pathway of TCC was also proposed. © 2012 Springer-Verlag Berlin Heidelberg. Source

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