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Your search keyword '"Wang Rong"' showing total 39 results
Start Over Author "Wang Rong" Search Limiters Peer Reviewed Journal chemical engineering journal Publisher elsevier b.v.
39 results on '"Wang Rong"'

37. Concentrating synthetic estrogen 17α-ethinylestradiol using microporous polyethersulfone hollow fiber membranes: Experimental exploration and molecular simulation.

Author

Ng, Chun Kiat, Bope, Christian Domilongo, Nalaparaju, Anjaiah, Cheng, Yuan, Lu, Lanyuan, Wang, Rong, and Cao, Bin

Subjects
*ESTROGEN, *ESTRADIOL, *POLYETHERSULFONE, *HOLLOW fibers, *MOLECULAR dynamics, *POROUS materials
Abstract

A synthetic hormone, 17α-ethynylestradiol (EE2), has received much attention due to its widespread occurrence and adverse effects on aquatic animals. The removal of EE2 from water has been very challenging mostly because of its low concentration in environmental waters. Here we report a simple and novel approach for concentrating EE2 through adsorption and elution using microporous polyethersulfone (PES) hollow fiber membrane in a cross-flow filtration system, which can be easily scalable for practical applications. Our results showed that microporous PES hollow fiber membrane has a high EE2 adsorption capability (∼100% from water containing 20 μg/L of EE2) and the adsorbed EE2 could be eluted using a small volume of 10% ethanol solution to achieve a recovery efficiency of 75.9 ± 8.5%. We further demonstrated that the PES hollow fiber membrane maintained ∼100% removal of EE2 throughout five cycles of adsorption and elution. Our results from molecular simulation suggest that the strong affinity between PES and EE2 is mainly attributed to the π- π interaction and the hydrogen bonding. This proof-of-concept demonstrates for the first time that PES hollow fiber membrane system can remove EE2 at low concentrations, and elute EE2 solutions at a much higher concentration over multiple cycles in a sustainable and environmentally-benign condition. [ABSTRACT FROM AUTHOR]

Published
2017
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39. Release and transformation of arsenic from As-bearing iron minerals by Fe-reducing bacteria.

Author

Wang, Yin, Liu, Xiao-hong, Si, You-bin, and Wang, Rong-fu

Subjects
*SOIL mineralogy, *CHEMICAL amplification, *SHEWANELLA oneidensis, *FERRIC oxide, *IRON ores, *POLLUTANTS, *ARSENIC
Abstract

Arsenic, a common highly-toxic pollutant, is mainly associated with the hydrous ferric oxides in soils and minerals. A possible mechanism for arsenic mobilization is the reductive dissolution of iron (hydr) oxides. In this paper, the possibilities of iron-reducing bacteria Shewanella oneidensis MR-1 and Shewanella sp. strain MR-4 in mobilization, oxidization and methylation of arsenic were investigated. Under laboratory conditions, the dynamics of As- and Fe-release from arsenopyrite and scorodite under microbial activities, the transformation of arsenic release from iron minerals and the environment factors affecting the arsenic release and transformation during reactions were examined. The aqueous concentrations of different forms of As were determined by a liquid chromatography–atomic fluorescence spectrometry (LC–AFS) and the new surface morphology of iron minerals was also measured and characterized using scanning electron microscopy (SEM) and X-ray diffractometry (XRD). Results indicated that As could be dissolved from arsenopyrite or scorodite and oxidized or even methylated quickly in the presence of Shewanella strains. The transformation of arsenic forms were affected by the culture temperatures, pH of environment medium, and spiked Fe(III) content in the solutions. Moreover, solid-phase analysis revealed that the morphology and mineralogy in the solid-phase products were changed, such as many wrinkle-shaped gullies were formed on surfaces of iron minerals. The amount of secondary precipitates also increased with time. The As mobility could be enhanced by the activity of dissimilatory iron-reducing bacteria in the environment. This study provides insights into in situ remediation of As pollution. [ABSTRACT FROM AUTHOR]

Published
2016
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