Search

Your search keyword '"XU Bin"' showing total 41 results
Start Over Author "XU Bin" Journal chemical engineering journal
41 results on '"XU Bin"'

36. Impact of pre-oxidation using H 2 O 2 and ultraviolet/H 2 O 2 on disinfection byproducts generated from chlor(am)ination of chloramphenicol

Author

Xu Ting, Li Pan, Chu Wenhai, Zhang Yimeng, Xu Bin, An Na, and Yin Da-qiang

Subjects
Florfenicol, General Chemical Engineering, Chloramphenicol, 0208 environmental biotechnology, 02 engineering and technology, General Chemistry, 010501 environmental sciences, Contamination, medicine.disease_cause, Thiamphenicol, 01 natural sciences, Industrial and Manufacturing Engineering, 020801 environmental engineering, chemistry.chemical_compound, chemistry, Environmental chemistry, Toxicity, medicine, Environmental Chemistry, Hydrogen peroxide, Chloramination, Ultraviolet, 0105 earth and related environmental sciences, medicine.drug
Abstract

Hydrogen peroxide with and without activation by ultraviolet irradiation (UV/H2O2 and H2O2, respectively) has been investigated to degrade emerging contaminants in drinking water. The antibiotic chloramphenicol (CAP) and its analogues (thiamphenicol and florfenicol), referred to collectively as CAPs, can produce a range of disinfection by-products (DBPs) during chlorination or chloramination (chlor(am)ination). The impact of unactivated and activated H2O2 pre-oxidation on the formation of nitrogenous and carbonaceous DBPs from the chlor(am)ination of CAP model precursors was investigated. A theoretical estimated toxicity evaluation was also carried out based on the DBPs that formed. H2O2 pretreatment alone did not affect organic carbon and nitrogen concentrations, but significantly reduced the formation of trichloromethane (TCM) during chlorination and trichloronitromethane (TCNM) during chloramination, and enhanced dichloroacetonitrile (DCAN) yields during chloramination. These significant changes in DBP yields caused by H2O2 pre-oxidation are attributable to the transformation of the three CAPs into more reactive precursor structures. The three CAPs did not form DCAN and TCNM during chlorination, regardless of whether H2O2 pre-oxidation was used. However, UV/H2O2 pretreatment resulted in the unexpected formation of TCNM during chlorination. Furthermore, UV/H2O2 pre-oxidation increased the formation of DCAN and TCNM, whereas it had little effect on TCM formation during chloramination. A preliminary estimated toxicity evaluation demonstrated that UV/H2O2 pre-oxidation at low doses, followed by chlorination, resulted in the lowest estimated toxicity from a range of DBPs. Conversely, the estimated toxicity evaluation showed that unactivated H2O2 (high dose) was preferable to UV activated H2O2 for overall control of these investigated DBPs during chloramination.

Published
2017

41. Preparation of TiO2–BaSO4 composite microparticles and their photocatalytic activity

Author

Chen, Rufen, Zhou, Juan, Xu, Bin, and Meng, Xiangmin

Subjects
*TITANIUM oxides, *PHOTOCATALYSIS, *CATALYTIC activity, *PARTICLE size distribution, *GEOMETRIC surfaces, *CHEMICAL reactions
Abstract

Abstract: The controlled synthesis of titanium oxide–barium sulfate composite microparticles (TBCMs) and their photocatalytic activity were investigated. Spherical TBCMs with hollow internal cavities were obtained via multi-time composited growth. The TBCMs were composed of rutile TiO2 nanorods and BaSO4 balls. With increasing number of compositing times, the TBCMs became more compact, and their sizes gradually increased. Homogeneous TBCMs with sizes ranging from 1.5μm to 2.0μm were formed after eight times of compositing. The TBCMs showed pronounced mesoporosity with a very narrow pore-size distribution and large surface areas. Among the various samples produced, those obtained after 8 times of compositing exhibited the highest adsorption and photocatalytic activities. TBCM photocatalysts could thus be reused effectively for several times with high catalytic reactivity. [Copyright &y& Elsevier]

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results