Graphene oxide membranes for effective removal of humic acid

Ren, Xiaojun; Ji, Dali; Wen, Xinyue; Bustamante, Heriberto; Daiyan, Rahman; Foller, Tobias; Khine, Yee Yee; Joshi, Rakesh

doi:10.1557/s43578-022-00647-6

Cited by 13 publications

(8 citation statements)

References 51 publications

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“…The widely used and studied well-aligned laminar structure of GOM [11][12][13][14][15] gave us an inspiration that confining GO sheets in GOM during reduction may maintain their morphology and resist the self-folding effect. Therefore, we designed an in-situ membrane-based GO reduction method using VC to obtain VC rGO membrane (VGM).…”

Section: Design Of In-situ Chemical Reduction Of Gomsmentioning

confidence: 99%

In-situ reduction of graphene oxide for electrochemical supercapacitor application

Lin,

Ren,

Wen

et al. 2024

Preprint

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Reduced graphene oxide (rGO) is a widely studied electrode material for energy storage, however, its strong re-stacking tendency during chemical reduction always leads to a degraded specific surface area and thus limits its performance. Therefore, it is necessary to control the morphology of rGO during the reduction process. Here, we develop a novel in-situ membrane-based method for the reduction of graphene oxide (GO) using a green and efficient vitamin C (VC) aqueous solution as reductant. The obtained electrode material (vitamin C reduced GO via membrane-based method, VG-M) exhibits a specific capacitance of 174 F/g at 1 A/g and 75.9% of retention at 40 A/g, which is about 9 times better than the highly self-stacked material from conventional methods (vitamin C reduced GO via stirring method, VG-S). This designed method successfully achieves the maintenance of rGO sheet morphology through laminar confinement in GO membrane and presents a simple approach towards two-dimensional (2D) material morphology control.

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Section: Design Of In-situ Chemical Reduction Of Gomsmentioning

confidence: 99%

In-situ reduction of graphene oxide for electrochemical supercapacitor application

Lin,

Ren,

Wen

et al. 2024

Preprint

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“…The concentration of rGO appears to have a complex effect on the contact angle, possibly indicating an optimal concentration for wettability. The hydrophilic character of the membrane is related to the existence of oxygen-containing functional moieties on the rGO sheets, where H-bonds may form between water molecules and oxygen atoms that are somewhat negatively charged, creating a very hydrophilic surface [56]. For the PA-rGO (0.005)/CHIT membrane (42.25 ± 2.0), introducing chitosan (CHIT) seems to have decreased the contact angle, compared to PA-rGO (0.005) alone.…”

Section: Contact Angle Of Membranesmentioning

confidence: 99%

Preparation, Characterization and Evaluation of Polyamide-Reduced Graphene Oxide as Selective Membranes for Water Purification

Alshahrani,

El-Habeeb,

Almutairi

et al. 2024

J. Compos. Sci.

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Amidst the ongoing advancements in membrane technology, a leading method has come to the forefront. Recent research has emphasized the substantial influence of surface attributes in augmenting the effectiveness of thin-film membranes in water treatments. These studies reveal how surface properties play a crucial role in optimizing the performance of these membranes, further establishing their prominence in the field of membrane technology. This recognition stems from the precise engineering of surfaces, ensuring they meet the demanding requirements of advanced separation processes. This study utilizes polyamide as a discerning layer, applied atop a polysulfone support sheet through interfacial polymerization (IP) for membrane fabrication. The amounts in the various membranes were created to vary. The membrane’s permeability to water with significant salt rejection was enhanced, which improved its effectiveness. The polyamide (PA) membrane comprising graphene oxide (rGO, 0.015%) had a water permeability of 48.90 L/m2 h at 22 bar, which was much higher than the mean permeability of polyamide membranes (25.0 L/m2 h at 22 bar). On the other hand, the PA–rGO/CHIT membranes exhibited the lowest water permeability due to their decreased surface roughness. However, the membranes’ effectiveness in rejecting salts ranged from 80% to 95% for PA–rGO and PA–rGO/CHIT membranes.

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“…Unlike pristine graphene, GO has a large number of oxygencontaining functional groups in addition to its delocalized π electron clouds on the surface [17][18][19][20]. Thence, the covalent functionalization for GO is typically based on the organic reactions between the carboxyl, epoxy, and hydroxyl groups of GO and the corresponding functional groups of additives.…”

Section: Covalent Go Functionalizationmentioning

confidence: 99%

Covalent functionalization of graphene oxide

Cao,

Quintano,

Joshi

2023

Carbon Rep.

Self Cite

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Over the past decade, graphene oxide (GO), an oxidized derivative of graphene, has been extensively used in various fields such as water treatment, ion sieving, gas separation, drug delivery, sensing, and energy storage due to the presence of oxygencontaining functional groups, which provide GO with intrinsic hydrophilicity, dispersibility, superpermeability, and insulating properties. Furthermore, depending on the requirements of different applications, these groups can be modified by bonding with various organic functional groups to improve these characteristics. This chemical modification approach is known as functionalization, and can be divided into covalent and non-covalent depending on the bonding between the GO and the additive. Although both covalent functionalization and non-covalent functionalization can be used with GO, covalent functionalization has greater versatility in terms of the modification mechanisms and long-term stability. In this review, we focus on the covalent functionalization of GO and discuss four effective covalent functionalization methods, which are determined by the specific oxygen-containing functional groups. We explain their respective functionalization mechanisms and finally summarize the impact of covalent functionalization on GO and explore its future potential.

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Graphene oxide membranes for effective removal of humic acid

Cited by 13 publications

References 51 publications

In-situ reduction of graphene oxide for electrochemical supercapacitor application

In-situ reduction of graphene oxide for electrochemical supercapacitor application

Preparation, Characterization and Evaluation of Polyamide-Reduced Graphene Oxide as Selective Membranes for Water Purification

Covalent functionalization of graphene oxide

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