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Modified ultrafiltration

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https://www.readbyqxmd.com/read/28601743/highly-antifouling-and-antibacterial-performance-of-poly-vinylidene-fluoride-ultrafiltration-membranes-blending-with-copper-oxide-and-graphene-oxide-nanofillers-for-effective-wastewater-treatment
#1
Chuanqi Zhao, Jinling Lv, Xiaochen Xu, Guoquan Zhang, Yuesuo Yang, Fenglin Yang
Innovation and effective wastewater treatment technology is still in great demand given the emerging contaminants frequently spotted from the aqueous environment. By blending with poly (vinylidene fluoride) (PVDF), the strong hydrophilic graphene oxide (GO) and antibacterial copper oxide (CuxO) were used as nanofillers to develop the novel, highly antifouling composite membranes via phase inversion process in our latest work. The existence and dispersion of GO and CuxO posed a significant role on morphologies, structures, surface composition and hydrophilicity of the developed composite membranes, confirmed by SEM, TEM, FTIR and XPS in depth characterization...
May 25, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28594542/development-of-hybrid-ultrafiltration-membranes-with-improved-water-separation-properties-using-modified-superhydrophilic-metal-organic-framework-nanoparticles
#2
Huazhen Sun, Beibei Tang, Peiyi Wu
Metal-organic frameworks (MOFs) are being intensively explored as filler materials for polymeric membranes primarily due to their high polymer affinity, large pore volumes, and alterable pore functionalities, but the development of MOF-based ultrafiltration (UF) membranes for water treatment lags behind. Herein, poly(sulfobetaine methacrylate) (PSBMA)-functionalized MOF UiO-66-PSBMA was developed, and incorporated into polysulfone (PSf) casting solution to fabricate novel hybrid UF membranes via phase-inversion method...
June 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28558291/versatile-polyvinylidene-fluoride-hybrid-ultrafiltration-membranes-with-superior-antifouling-antibacterial-and-self-cleaning-properties-for-water-treatment
#3
Yuan-Wei Huang, Zuo-Ming Wang, Xi Yan, Jun Chen, Ya-Jun Guo, Wan-Zhong Lang
Novel ultrafiltration membranes with both superior antibacterial and self-cleaning properties were fabricated. By using a non-solvent induced phase separation method (NIPS), N-halamine epoxide and siloxane were grafted onto the multi-walled carbon nanotubes (N-Si-MWNTs) to fabricate polyvinylidene fluoride (PVDF) hybrid membranes. The membrane morphology was observed under a field emission scanning electron microscopy. The results demonstrated that the PVDF hybrid membranes had an asymmetrical structure, and their hydraulic permeability was evidently enhanced with the addition of modified MWNTs...
May 24, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28541950/high-performance-cellulose-acetate-polysulfone-blend-ultrafiltration-membranes-for-removal-of-heavy-metals-from-water
#4
Pourya Moradihamedani, Abdul Halim Abdullah
Neat cellulose acetate (CA) and CA/polysulfone (PSf) blend ultrafiltration membranes in the presence of polyvinylpyrrolidone as a pore former were prepared via a phase inversion technique. The prepared membranes were characterized by Fourier transform infrared, scanning electron microscopy, mechanical strength, water content, porosity, permeate flux and heavy metals (Pb(2+), Cd(2+), Zn(2+) and Ni(2+)) rejection to comprehend the impact of polymer blend composition and additive on the properties of the modified membranes...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28525669/relationship-between-bioimpedance-determined-body-composition-and-peritoneal-transport-in-peritoneal-dialysis
#5
Bernardo M da Costa, Gloria Del Peso, Maria Auxiliadora Bajo, Gilda Carreño, Marta Ferreira, Carina Ferreira, Rafael Selgas
PURPOSE: In peritoneal dialysis (PD) patients, body fluid homeostasis is dependent on peritoneal elimination of water and solutes. Patients with less favorable peritoneal transport parameters should be more overhydrated. Despite this, the association between faster transport and overhydration (OH) is weak, and the factors that influence hydration status are still poorly characterized. Modified peritoneal equilibration tests (PET) offer us new parameters that might correlate better with hydration status, like free water transport (FWT)...
May 18, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28499179/fluorescent-natural-organic-matter-responsible-for-ultrafiltration-membrane-fouling-fate-contributions-and-fouling-mechanisms
#6
Hui Wang, An Ding, Zhendong Gan, Fangshu Qu, Xiaoxiang Cheng, Langming Bai, Shaodong Guo, Guibai Li, Heng Liang
Membrane fouling has been a main obstacle to the success of ultrafiltration (UF) technology. Recently, fluorescent natural organic matter (FNOM), including humic-like substances (HS) and protein-like substances, has been recognized as substances responsible for membrane fouling. In this study, the matrix of FNOM in natural river water was substantially modified by combined coagulation and powdered activated carbon adsorption to enhance the diversity of the FNOM matrix. Fluorescence excitation emission matrix spectroscopy was employed to characterize FNOM components during the UF process...
May 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28493131/filter-aided-sample-preparation-fasp-for-improved-proteome-analysis-of-recombinant-chinese-hamster-ovary-cells
#7
Orla Coleman, Michael Henry, Martin Clynes, Paula Meleady
Chinese hamster ovary (CHO) cells are the most commonly used mammalian host cell line for biopharmaceutical production because of their ability to correctly fold and posttranslationally modify recombinant proteins that are compatible with human use. Proteomics, along with other 'omic platforms, are being used to understand the biology of CHO cells with the ultimate aim of enhancing CHO cell factories for more efficient production of biopharmaceuticals. In this chapter, we will describe an efficient protocol called Filter Aided Sample Preparation (FASP) for the extraction of proteins from CHO cells for proteomic studies...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28486230/the-rise-of-expanded-hemodialysis
#8
Claudio Ronco
The low water permeability feature of original cellulosic membranes was considered an advantage in the absence of dialysis equipment that are capable of controlling water removal. The advent of ultrafiltration control systems led to the development and use of high-flux (HF) membranes that allowed improved middle molecule removal including β-2 microglobulin. Further advances in technology allowed better control over the structure and permeability of membranes. Different polymers and improved spinning modalities led to significant advances in solute removal and hemocompatibility...
2017: Blood Purification
https://www.readbyqxmd.com/read/28431257/integrated-antimicrobial-and-antifouling-ultrafiltration-membrane-by-surface-grafting-peo-and-n-chloramine-functional-groups
#9
Shuhua Hou, Jialin Xing, Xue Dong, Jifu Zheng, Shenghai Li
Ultrafiltration membranes with integrated antimicrobial and antifouling properties were fabricated using an engineering thermoplastic (carboxylated cardopoly(aryl ether ketone, PEK-COOH). Different molecular weights of PEO (Mw: 120, 350, 550) were grafted to the PEK-COOH membrane surface via EDC/NHS methodology. N-chloramine modified membranes then were prepared by simple exposure to dilute sodium hypochlorite solution. The surface grafting processes were all performed in water (i.e. without organic solvent)...
April 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28413417/the-dialysis-sodium-gradient-a-modifiable-risk-factor-for-fluid-overload
#10
Emilie Trinh, Catherine Weber
BACKGROUND: Fluid overload in patients on conventional hemodialysis is a frequent complication, associated with increased cardiovascular morbidity and mortality. The dialysate sodium prescription is a potential modifiable risk factor. Our primary objective was to describe associations between dialysate-to-serum sodium gradient and parameters of fluid status. A secondary objective was to evaluate the 6-month risk of hospitalization and mortality in relation to sodium gradient. METHODS: We performed a cross-sectional study of 110 prevalent conventional hemodialysis patients at a single center...
January 2017: Nephron Extra
https://www.readbyqxmd.com/read/28401478/improved-detection-of-norovirus-and-hepatitis-a-virus-in-surface-water-by-applying-pre-pcr-processing
#11
Emmy Borgmästars, Mehrdad Mousavi Jazi, Sofia Persson, Linda Jansson, Peter Rådström, Magnus Simonsson, Johannes Hedman, Ronnie Eriksson
Quantitative reverse transcriptase polymerase chain reaction (RT-qPCR) detection of waterborne RNA viruses generally requires concentration of large water volumes due to low virus levels. A common approach is to use dead-end ultrafiltration followed by precipitation with polyethylene glycol. However, this procedure often leads to the co-concentration of PCR inhibitors that impairs the limit of detection and causes false-negative results. Here, we applied the concept of pre-PCR processing to optimize RT-qPCR detection of norovirus genogroup I (GI), genogroup II (GII), and hepatitis A virus (HAV) in challenging water matrices...
April 11, 2017: Food and Environmental Virology
https://www.readbyqxmd.com/read/28388506/integrated-membrane-and-microbial-fuel-cell-technologies-for-enabling-energy-efficient-effluent-re-use-in-power-plants
#12
Namita Shrestha, Govinda Chilkoor, Lichao Xia, Catalina Alvarado, James E Kilduff, John J Keating, Georges Belfort, Venkataramana Gadhamshetty
Municipal wastewater is an attractive alternative to freshwater sources to meet the cooling water needs of thermal power plants. Here we offer an energy-efficient integrated microbial fuel cell (MFC)/ultrafiltration (UF) process to purify primary clarifier effluent from a municipal wastewater treatment plant for use as cooling water. The microbial fuel cell was shown to significantly reduce chemical oxygen demand (COD) in the primary settled wastewater effluent upstream of the UF module, while eliminating the energy demand required to deliver dissolved oxygen in conventional aerobic treatment...
June 15, 2017: Water Research
https://www.readbyqxmd.com/read/28324709/improvement-of-virus-removal-using-ultrafiltration-membranes-modified-with-grafted-zwitterionic-polymer-hydrogels
#13
Ruiqing Lu, Chang Zhang, Maria Piatkovsky, Mathias Ulbricht, Moshe Herzberg, Thanh H Nguyen
Potable water reuse has been adopted by cities suffering water scarcity in recent years. The microbial safety in water reuse, especially with respect to pathogenic viruses, is still a concern for water consumers. Membrane filtration can achieve sufficient removal of pathogenic viruses without disinfection byproducts, but the required energy is intensive. In this study, we graft-polymerized zwitterionic SPP ([3-(methacryloylamino) propyl] dimethyl (3-sulfopropyl) ammonium hydroxide) on a 150 kDa ultrafiltration polyethersulfone membrane to achieve a significantly higher virus removal...
June 1, 2017: Water Research
https://www.readbyqxmd.com/read/28254281/polysulfone-hemodiafiltration-membranes-with-enhanced-anti-fouling-and-hemocompatibility-modified-by-poly-vinyl-pyrrolidone-via-in-situ-cross-linked-polymerization
#14
Lijing Zhu, Haiming Song, Jiarong Wang, Lixin Xue
Poly(vinyl pyrrolidone) (PVP) and its copolymers have been widely employed for the modification of hemodiafiltration membranes due to their excellent hydrophilicity, antifouling and hemocompatibility. However, challenges still remain to simplify the modification procedure and to improve the utilization efficiency. In this paper, antifouling and hemocompatibility polysulfone (PSf) hemodiafiltration membranes were fabricated via in situ cross-linked polymerization of vinyl pyrrolidone (VP) and vinyltriethoxysilane (VTEOS) in PSf solutions and non-solvent induced phase separation (NIPS) technique...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28216617/eco-friendly-superwetting-material-for-highly-effective-separations-of-oil-water-mixtures-and-oil-in-water-emulsions
#15
Chih-Feng Wang, Sheng-Yi Yang, Shiao-Wei Kuo
Because the treatment of oily wastewater, generated from many industrial processes, has become an increasing environmental concern, the search continues for simple, inexpensive, eco-friendly, and readily scalable processes for fabricating novel materials capable of effective oil/water separation. In this study we prepared an eco-friendly superhydrophilic and underwater superoleophobic polyvinylpyrrolidone (PVP)-modified cotton that mediated extremely efficient separations of mixtures of oil/water and oil/corrosive solutions...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28096442/kinetic-modeling-of-incremental-ambulatory-peritoneal-dialysis-exchanges
#16
Steven Guest, John K Leypoldt, Michelle Cassin, Martin Schreiber
♦ BACKGROUND: Incremental peritoneal dialysis (PD), the gradual introduction of dialysate exchanges at less than full-dose therapy, has been infrequently described in clinical reports. One concern with less than full-dose dialysis is whether urea clearance targets are achievable with an incremental regimen. In this report, we used a large database of PD patients, across all membrane transport types, and performed urea kinetic modeling determinations of possible incremental regimens for an individual membrane type...
March 2017: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/28078887/electrospun-regenerated-cellulose-nanofiber-membranes-surface-grafted-with-water-insoluble-poly-hema-or-water-soluble-poly-aas-chains-via-the-atrp-method-for-ultrafiltration-of-water
#17
Zhao Wang, Caitlin Crandall, Vicki L Prautzsch, Rajesh Sahadevan, Todd J Menkhaus, Hao Fong
Electrospun nanofiber membranes (ENMs) have demonstrated promising applications for water purification primarily due to high water flux and low degree of fouling. However, the equivalent/apparent pore sizes of as-electrospun ENMs are in microns/submicrons; therefore, the ENMs can only be directly utilized for microfiltration applications. To make regenerated cellulose (RC) ENMs for ultrafiltration applications, atom transfer radical polymerization (ATRP) was studied to graft polymer chains onto the surface of RC nanofibers; specifically, monomers of 2-hydroxyethyl methacrylate (HEMA) and sodium acrylate (AAS) were selected for surface-grafting water-insoluble and water-soluble polymer chains onto RC nanofibers, respectively...
February 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28031170/influence-of-sex-on-hyperfiltration-in-patients-with-uncomplicated-type-1-diabetes
#18
Marko Škrtić, Yuliya Lytvyn, Petter Bjornstad, Heather N Reich, James W Scholey, Paul Yip, Etienne B Sochett, Bruce Perkins, David Z I Cherney
The aim of this analysis was to examine sex-based differences in renal segmental resistances in healthy controls (HCs) and patients with type 1 diabetes (T1D). We hypothesized that hyperfiltration-an early hemodynamic abnormality associated with diabetic nephropathy-would disproportionately affect women with T1D, thereby attenuating protection against the development of renal complications. Glomerular hemodynamic parameters were evaluated in HC (n = 30) and in normotensive, normoalbuminuric patients with T1D and either baseline normofiltration [n = 36, T1D-N, glomerular filtration rate (GFR) 90-134 ml·min(-1)·1...
April 1, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/27993445/a-possible-water-soluble-inducer-for-synthesis-of-cellulase-in-aspergillus-niger
#19
Jian-Guo Zhang, Qi-Meng Li, Kiran Thakur, Shah Faisal, Zhao-Jun Wei
The synthesis of cellulase in filamentous fungi can be triggered by several inducers. In this study, a bamboo-shoot shell pretreated with Pleurotus ostreatus could promote the formation of cellulases in Aspergillus niger. Further identification, including UPLC-TOF-MS, ultrafiltration, and FT-IR, denoted that the soluble inducer was not a traditional disaccharide but a type of modified lignin polymer. This revelation may result in incipient strategies to ameliorate cellulase productivity.
February 2017: Bioresource Technology
https://www.readbyqxmd.com/read/27935537/predictors-of-residual-renal-function-decline-in-peritoneal-dialysis-patients-the-balanz-trial
#20
Htay Htay, Yeoungjee Cho, Elaine M Pascoe, Darsy Darssan, Carmel M Hawley, David W Johnson
♦ Objective: Preservation of residual renal function (RRF) is associated with improved survival. The aim of the present study was to identify independent predictors of RRF and urine volume (UV) in incident peritoneal dialysis (PD) patients. ♦ Methods: The study included incident PD patients who were balANZ trial participants. The primary and secondary outcomes were RRF and UV, respectively. Both outcomes were analyzed using mixed effects linear regression with demographic data in the first model and PD-related parameters included in a second model...
December 1, 2016: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
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