Fouling resistant, high flux, charge tunable hybrid ultrafiltration membranes using polymer chains grafted graphene oxide for NOM removal

2020 ◽  
pp. 127300
Author(s):  
Mahendra Kumar ◽  
Hanaa M. Baniowda ◽  
N. Sreedhar ◽  
Efrem Curcio ◽  
Hassan A. Arafat
Keyword(s):  
Graphene Oxide ◽  
Polymer Chains ◽  
High Flux ◽  
Ultrafiltration Membranes ◽  
Flux Charge

scholarly journals Polyethersulfone/Graphene Oxide Ultrafiltration Membranes from Solutions in Ionic Liquid

MRS Advances ◽  
2017 ◽  
Vol 2 (46) ◽  
pp. 2505-2511 ◽  
Author(s):  
Dinesh. K. Mahalingam ◽  
DooLi. Kim ◽  
Suzana. P. Nunes
Keyword(s):  
Graphene Oxide ◽  
Dimethyl Formamide ◽  
High Flux ◽  
Ultrafiltration Membranes ◽  
Cross Sectional ◽  
Selective Layer ◽  
Trade Off ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Microscopy Images

ABSTRACTNovel high flux polyethersulfone (PES) ultrafiltration membranes were fabricated by incorporating different amounts of graphene oxide (GO) sheets to PES as nanofillers. The membranes were prepared from solutions in 50/50 1-ethyl-3-methylimidazolium-diethylphosphate/N,N-dimethyl formamide. It was observed that the water permeance increased from 550 to 800 L m-2h-1bar-1, with incorporation of 1 wt% GO, keeping a molecular weight cut-off (MWCO) of approximately 32-34 kg mol-1. Cross-sectional scanning electron microscopy images of GO/PES membranes showed the formation of ultrathin selective layer unlike pristine membranes. Contact angle measurements confirmed the increase of hydrophilicity, by increasing the GO concentration. The rejection of humic acid and bovine serum albumin was demonstrated. The mechanical properties were improved, compared with the pristine membranes. The performance was just above the trade-off relationship between permeance and separation factor for PES membranes reported in the literature.

Fabrication of graphene oxide incorporated polyethersulfone hybrid ultrafiltration membranes for humic acid removal

2019 ◽  
Vol 223 ◽  
pp. 17-23 ◽  
Author(s):  
Mohammad Saad Algamdi ◽  
Ibrahim Hotan Alsohaimi ◽  
Jenny Lawler ◽  
Hazim M. Ali ◽  
Abdullah Mohammed Aldawsari ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Humic Acid ◽  
Ultrafiltration Membranes

High flux ethanol dehydration using nanofibrous membranes containing graphene oxide barrier layers

2013 ◽  
Vol 1 (41) ◽  
pp. 12998 ◽  
Author(s):  
Tsung-Ming Yeh ◽  
Zhe Wang ◽  
Devinder Mahajan ◽  
Benjamin S. Hsiao ◽  
Benjamin Chu
Keyword(s):  
Graphene Oxide ◽  
High Flux ◽  
Ethanol Dehydration ◽  
Barrier Layers ◽  
Oxide Barrier ◽  
Nanofibrous Membranes

scholarly journals Effect of Structure of Polymers Grafted from Graphene Oxide on the Compatibility of Particles with a Silicone-Based Environment and the Stimuli-Responsive Capabilities of Their Composites

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 591 ◽  
Author(s):  
Monika Zygo ◽  
Miroslav Mrlik ◽  
Marketa Ilcikova ◽  
Martina Hrabalikova ◽  
Josef Osicka ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Graphene Oxide ◽  
Radical Polymerization ◽  
Polymer Brushes ◽  
Silicone Oil ◽  
Polymer Chains ◽  
Butyl Methacrylate ◽  
Raman Shift ◽  
Stimuli Responsive ◽  
Grafted Polymer

This study reports the utilization of controlled radical polymerization as a tool for controlling the stimuli-responsive capabilities of graphene oxide (GO) based hybrid systems. Various polymer brushes with controlled molecular weight and narrow molecular weight distribution were grafted from the GO surface by surface-initiated atom transfer radical polymerization (SI-ATRP). The modification of GO with poly(n-butyl methacrylate) (PBMA), poly(glycidyl methacrylate) (PGMA), poly(trimethylsilyloxyethyl methacrylate) (PHEMATMS) and poly(methyl methacrylate) (PMMA) was confirmed by thermogravimetric analysis (TGA) coupled with online Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Various grafting densities of GO-based materials were investigated, and conductivity was elucidated using a four-point probe method. Raman shift and XPS were used to confirm the reduction of surface properties of the GO particles during SI-ATRP. The contact angle measurements indicated the changes in the compatibility of GOs with silicone oil, depending on the structure of the grafted polymer chains. The compatibility of the GOs with poly(dimethylsiloxane) was also investigated using steady shear rheology. The tunability of the electrorheological, as well as the photo-actuation capability, was investigated. It was shown that in addition to the modification of conductivity, the dipole moment of the pendant groups of the grafted polymer chains also plays an important role in the electrorheological (ER) performance. The compatibility of the particles with the polymer matrix, and thus proper particles dispersibility, is the most important factor for the photo-actuation efficiency. The plasticizing effect of the GO-polymer hybrid filler also has a crucial impact on the matrix stiffness and thus the ability to reversibly respond to the external light stimulation.

scholarly journals Control of pH-Responsiveness in Graphene Oxide Grafted with Poly-DEAEMA via Tailored Functionalization

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 614 ◽  
Author(s):  
Roxana Noriega-Navarro ◽  
Jésica Castro-Medina ◽  
Martha V. Escárcega-Bobadilla ◽  
Gustavo A. Zelada-Guillén
Keyword(s):  
Graphene Oxide ◽  
Polymer Chains ◽  
The Novel ◽  
Potentiometric Response ◽  
Solid State Sensor ◽  
Material History ◽  
Multiple Variables ◽  
Ph Sensitive Polymer ◽  
Ph Range ◽  
Range Interval

Polymer-grafted nanomaterials based on carbon allotropes and their derivatives (graphene oxide (GO), etc.) are typically prepared by successive reaction stages that depend upon the initial functionalities in the nanostructure and the polymerization type needed for grafting. However, due to the multiple variables involved in the functionalization steps, it is commonly difficult to predict the properties in the final product and to correlate the material history with its final performance. In this work, we explored the steps needed to graft the carboxylic acid moieties in GO (COOH@GO) with a pH-sensitive polymer, poly[2-(diethylamino)ethyl methacrylate] (poly[DEAEMA]), varying the reactant ratios at each stage prior to polymerization. We studied the combinatorial relationship between these variables and the behavior of the novel grafted material GO-g-poly[DEAEMA], in terms of swelling ratio vs. pH (%Q) in solid specimens and potentiometric response vs. Log[H+] in a solid-state sensor format. We first introduced N-hydroxysuccinimide (NHS)-ester moieties at the –COOH groups (GO-g-NHS) by a classical activation with N-ethyl-N′-(3-dimethylaminopropyl)carbodiimide (EDC). Then, we substituted the NHS-ester groups by polymerizable amide-linked acrylic moieties using 2-aminoethyl methacrylate (AEMA) at different ratios to finally introduce the polymer chains via radical polymerization in an excess of DEAEMA monomer. We found correlated trends in swelling pH range, interval of maximum and minimum swelling values, response in potentiometry and potentiometric linear range vs. Log[H+] and could establish their relationship with the combinatorial stoichiometries in synthetic stages.

Grafting Activated Graphene Oxide Nanosheets onto Ultrafiltration Membranes Using Polydopamine to Enhance Antifouling Properties

2020 ◽  
Vol 12 (42) ◽  
pp. 48179-48187
Author(s):  
Xiaoyi Chen ◽  
Erda Deng ◽  
Dongwon Park ◽  
Blaine A. Pfeifer ◽  
Ning Dai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Graphene Oxide Nanosheets ◽  
Ultrafiltration Membranes
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