ORCID Profile
0000-0001-8257-0282
Current Organisation
Nanyang Technological University
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Publisher: Elsevier BV
Date: 06-2017
DOI: 10.1016/J.WATRES.2017.03.025
Abstract: Recent studies report high concentrations of haloacetic acids (HAAs), a prevalent class of toxic disinfection by-products, in swimming pool water (SPW). We investigated the removal of 9 HAAs by four commercial reverse osmosis (RO) and nanofiltration (NF) membranes. Under typical SPW conditions (pH 7.5 and 50 mM ionic strength), HAA rejections were >60% for NF270 with molecular weight cut-off (MWCO) equal to 266 Da and equal or higher than 90% for XLE, NF90 and SB50 with MWCOs of 96, 118 and 152 Da, respectively, as a result of the combined effects of size exclusion and charge repulsion. We further included 7 neutral hydrophilic surrogates as molecular probes to resolve the rejection mechanisms. In the absence of strong electrostatic interaction (e.g., pH 3.5), the rejection data of HAAs and surrogates by various membranes fall onto an identical size-exclusion (SE) curve when plotted against the relative-size parameter, i.e., the ratio of molecular radius over membrane pore radius. The independence of this SE curve on molecular structures and membrane properties reveals that the relative-size parameter is a more fundamental SE descriptor compared to molecular weight. An effective molecular size with the Stokes radius accounting for size exclusion and the Debye length accounting for electrostatic interaction was further used to evaluate the rejection. The current study provides valuable insights on the rejection of trace contaminants by RO/NF membranes.
Publisher: Informa UK Limited
Date: 15-02-2012
Publisher: Elsevier BV
Date: 11-2005
Publisher: Elsevier BV
Date: 11-2011
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 05-2016
Publisher: American Chemical Society (ACS)
Date: 23-12-2015
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 12-2012
Publisher: Elsevier BV
Date: 09-2006
Publisher: American Chemical Society (ACS)
Date: 06-04-2016
Abstract: Biodegradable food packaging promises a more sustainable future. Among the many different biopolymers used, poly(lactic acid) (PLA) possesses the good mechanical property and cost-effectiveness necessary of a biodegradable food packaging. However, PLA food packaging suffers from poor water vapor and oxygen barrier properties compared to many petroleum-derived ones. A key challenge is, therefore, to simultaneously enhance both the water vapor and oxygen barrier properties of the PLA food packaging. To address this issue, we design a sandwich-architectured PLA-graphene composite film, which utilizes an impermeable reduced graphene oxide (rGO) as the core barrier and commercial PLA films as the outer protective encapsulation. The synergy between the barrier and the protective encapsulation results in a significant 87.6% reduction in the water vapor permeability. At the same time, the oxygen permeability is reduced by two orders of magnitude when evaluated under both dry and humid conditions. The excellent barrier properties can be attributed to the compact lamellar microstructure and the hydrophobicity of the rGO core barrier. Mechanistic analysis shows that the large rGO lateral dimension and the small interlayer spacing between the rGO sheets have created an extensive and tortuous diffusion pathway, which is up to 1450-times the thickness of the rGO barrier. In addition, the sandwiched architecture has imbued the PLA-rGO composite film with good processability, which increases the manageability of the film and its competency to be tailored. Simulations using the PLA-rGO composite food packaging film for edible oil and potato chips also exhibit at least eight-fold extension in the shelf life of these oxygen and moisture sensitive food products. Overall, these qualities have demonstrated the high potential of a sandwich-architectured PLA-graphene composite film for food packaging applications.
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 02-2014
Publisher: Informa UK Limited
Date: 05-09-2017
DOI: 10.1080/09593330.2017.1369577
Abstract: Water contamination with chlorinated hydrocarbons such as chloroform (CHCl
Publisher: Elsevier BV
Date: 07-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4EW00073K
Abstract: New thermally responsive ionic liquid draw solutes generate high flux against seawater with substantially reduced electrical energy consumption.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2RA22173J
Publisher: Elsevier BV
Date: 03-2017
DOI: 10.1016/J.WATRES.2016.11.040
Abstract: We investigated the removal of haloacetic acids (HAAs) from swimming pool waters (SPWs) by two nanofiltration membranes NF270 and NF90. The strong matrix effect (particularly by Ca
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 06-2015
Publisher: American Chemical Society (ACS)
Date: 23-09-2014
DOI: 10.1021/IE501610Q
Publisher: Wiley
Date: 06-11-2015
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 15-02-2001
Publisher: Elsevier BV
Date: 10-2012
Publisher: Elsevier BV
Date: 08-2014
Publisher: Elsevier BV
Date: 11-2011
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 11-2013
DOI: 10.1016/J.COLSURFB.2013.06.008
Abstract: Aquaporin-based biomimetic membranes have potential as promising membranes for water purification and desalination due to the exceptionally high water permeability and selectivity of aquaporins. However, the design and preparation of such membranes for practical applications are very challenging as the relevant fundamental research is rather limited to provide guidance. Here we investigated the basic characteristics and fusion behaviour of proteoliposomes incorporated with aquaporin Z (AqpZ) on to solid surfaces. This study is expected to offer a better understanding of the properties of proteoliposomes and the potential of the vesicle fusion technique. Our results show that after incorporation of AqpZ, the size and surface charge density of the proteoliposomes change significantly compared with those of liposomes. Although the liposome could easily form a supported lipid bilayer on silica via vesicle rupture, it is much more difficult for proteoliposomes to fuse completely into a bilayer on the same substrate. In addition, the fusion of proteoliposomes is further hindered as the density of incorporated AqpZ is increased, suggesting that proteoliposome with more proteins become more robust. However, both the liposome and proteoliposome have difficulty forming supported lipid bilayers on the surface of a polyelectrolyte layer even though it carries an opposite charge, indicating that the polymer may play an important role in stabilising vesicles. It was also observed that a high concentration of AqpZ could be incorporated into the 1,2-diphytanoyl-sn-glycero-3-phosphocholine (DPhPC) liposome even though its permeability decreased. These findings may provide some useful guidance for preparing such biomimetic membranes.
Publisher: Elsevier BV
Date: 11-2014
Publisher: American Chemical Society (ACS)
Date: 03-10-2012
DOI: 10.1021/IE3002183
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 07-2014
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 11-2013
Publisher: Informa UK Limited
Date: 04-2013
Publisher: Elsevier BV
Date: 2013
No related grants have been discovered for Rong Wang.