Carboxyl-functionalized graphene oxide polyamide nanofiltration membrane for desalination of dye solutions containing monovalent salt

Zhang, Huijuan; Li, Bin; Pan, Jing; Qi, Yawei; Shen, Jinwen; Gao, Congjie; Bruggen, Bart Van der

doi:10.1016/j.memsci.2017.05.075

Cited by 172 publications

(33 citation statements)

References 43 publications

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“…In general, NaCl is added by the textile industry as an exhausting agent or promoter of the chemical reaction [ 40 ]; consequently, the nanofiltration is a promising separation process to recycle the dye without the NaCl [ 20 ]. The dye removal and salt rejection were conducted using 100 mg/L Congo red and 1000 mg/L NaCl ( Figure 5 b).…”

Section: Resultsmentioning

confidence: 99%

“…The salt rejection followed this order: Na 2 SO 4 > MgSO 4 > NaCl > MgCl 2 . This sequence of salt rejection is common for a negatively charged NF membrane because its separation mechanism is based on Donnan exclusion [ 40 , 41 ]. Moreover, the Congo red and EBT rejection were above 99%, although the EBT has a smaller molecular weight, 461.38 g/mol, than Congo red, 696.99 g/mol.…”

Section: Resultsmentioning

confidence: 99%

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High-Performance Polyacrylic Acid-Grafted PVDF Nanofiltration Membrane with Good Antifouling Property for the Textile Industry

et al. 2020

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In the textile industry, a high-efficiency dye removal and low-retention of salt is demanded for recycling wastewater. In this study, polyvinylidene fluoride (PVDF) ultrafiltration membrane was transformed to a negatively charged loose nanofiltration (NF) membrane through UV-grafting of acrylic acid. At the optimal exposure of PVDF membrane in UV light for 5 min, the membrane had a high dye recovery above 99% (Congo red and Eriochrome® Black T) and a low sodium chloride (NaCl) rejection of less than 15% along with pure water flux of 26 L∙m−2∙h−1∙bar−1. Its antifouling and oleophobicity surface properties were verified using fluorescent- bovine serum albumin (BSA) and underwater mineral oil contact angle, respectively. According to the fluorescent microscopic images, the modified membrane had ten times lower adhesion of protein on the surface than the unmodified membrane. The underwater oil contact angle was raised from 110° to 155°. Moreover, the salt rejection followed this sequence: Na2SO4 > MgSO4 > NaCl > MgCl2, which agreed with the typical negatively charged NF membrane. In addition, the physicochemical characterization of membranes was further investigated to understand and link to the membrane performance, such as surface functional group, surface elements analysis, surface roughness/morphology, and surface hydrophilicity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High-Performance Polyacrylic Acid-Grafted PVDF Nanofiltration Membrane with Good Antifouling Property for the Textile Industry

et al. 2020

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“…Membrane separation technology has attracted worldwide attention due to its high efficiency, low cost, and energy savings. Nanofiltration (NF) is a pressure‐driven membrane process with separation performance between those of reverse osmosis (RO) and ultrafiltration (UF) 3 . Compared with RO, NF presents good permeability under low operating pressure, can effectively separate divalent or multivalent anions and can reject organic molecules with molar masses above 300, and is one of the most promising and practical membrane treatment technologies in wastewater treatment 3‐7 …”

Section: Introductionmentioning

confidence: 99%

Graphene oxide/multi‐walled carbon nanotubes nanocompsite polyamide nanofiltration membrane for dyeing‐printing wastewater treatment

Wei

Cao

et al. 2020

Polymers for Advanced Techs

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Graphene oxide (GO)/multi‐walled carbon nanotubes (MWCNTs) modified nanofiltration (NF) membranes were successfully fabricated by interfacial polymerization of piperazine (PIP) and 1,3,5‐benzenetricarbonyl trichloride (TMC). Compared with the pristine polyamide (PA) membrane and GO membrane, the typical structure of the granular protrusions on the surface of the GO/MWCNTs membrane gradually disappeared, and a regular ordered morphology appeared. The membrane thickness and surface roughness were increased according to the results of field emission scanning electron microscopy (FE‐SEM) and atomic force microscopy (AFM). The contact angle of GO/MWCNTs NF membranes progressively decreased from 57° to 23°, indicating the enhancement of surface hydrophilicity. The best NF performance was achieved when the ratio of GO to MWCNTs was 6:3 (G‐M‐3). The water flux was 55.6 L/m2.h, which was 33.7% higher than that of the GO membrane, and the rejection rate for Na2SO4 was maintained at approximately 94%. Both modified NF membranes could treat actual dyeing‐printing wastewater effectively. The anti‐fouling performance of G‐M‐3 was better than that of G3. Therefore, GO/MWCNTs‐modified NF membranes have a good application prospects in the field of wastewater treatment and water purification.

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“…Although CG was widely applied in semiconductors , , supercapacitors , electrochemiluminescence , biosensors , and hydrogels , less literature is available on its application in membrane separation comparing with GO. To the best of our knowledge, Gao et al , prepared CG and CG/polyamide nanofiltration membranes and applied them for dye solution desalination. The introduction of CG enhanced the membrane performance.…”

Section: Introductionmentioning

confidence: 99%

Poly(vinyl alcohol)/Carboxyl Graphene Membranes for Ethanol Dehydration by Pervaporation

et al. 2020

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Carboxyl graphene (CG) with two functions of hybridization and crosslinking was incorporated into poly(vinyl alcohol) (PVA) matrix to form PVA/CG mixed‐matrix membranes (MMMs). The membranes demonstrated excellent mechanical properties and thermal stability. The improved hydrophilicity and formed crosslinking structure led to moderate swelling. The membrane crystallinity decreased and the free volume was promoted with increasing CG loading amount. The pervaporation (PV) separation performance for ethanol dehydration indicated that both permeation flux and separation factor were enhanced simultaneously at the optimum CG loading. Subsequently, the permeation flux continued to increase while the separation factor declined at higher CG loadings.

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Carboxyl-functionalized graphene oxide polyamide nanofiltration membrane for desalination of dye solutions containing monovalent salt

Cited by 172 publications

References 43 publications

High-Performance Polyacrylic Acid-Grafted PVDF Nanofiltration Membrane with Good Antifouling Property for the Textile Industry

High-Performance Polyacrylic Acid-Grafted PVDF Nanofiltration Membrane with Good Antifouling Property for the Textile Industry

Graphene oxide/multi‐walled carbon nanotubes nanocompsite polyamide nanofiltration membrane for dyeing‐printing wastewater treatment

Poly(vinyl alcohol)/Carboxyl Graphene Membranes for Ethanol Dehydration by Pervaporation

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