Influence of integrating graphene oxide quantum dots on the fine structure characterization and alcohol dehydration performance of pervaporation composite membrane

Lecaros, Rumwald Leo G.; Deseo, Khainah M.; Hung, Wei‐Song; Tayo, Lemmuel L.; Hu, Chien‐Chieh; An, Quan‐Fu; Tsai, Hui-An; Lee, Kueir‐Rarn; Lai, Juin‐Yih

doi:10.1016/j.memsci.2019.01.019

Cited by 45 publications

(12 citation statements)

References 65 publications

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“…Then, the diluted solution was repeatedly dialyzed using a CelluSep H1 dialysis tube (molecular weight cutoff of 2000 Da) following a previous study. 26 The resulting acid-treated MWCNT dispersion was separated using a centrifuge, and the precipitate was dried at 30 °C in a vacuum oven before being subjected to material characterizations and adding into the polymer. The modified MWCNTs were labelled as ACNT2, ACNT4, or ACNT6, in which the number indicated the acid-treatment time.…”

Section: Methodsmentioning

confidence: 99%

“…When the acid-treatment was finished, the solution was left to ambient temperature followed by dilution using 2 L of deionized water. Then, the diluted solution was repeatedly dialyzed using a CelluSep H1 dialysis tube (molecular weight cutoff of 2000 Da) following a previous study . The resulting acid-treated MWCNT dispersion was separated using a centrifuge, and the precipitate was dried at 30 °C in a vacuum oven before being subjected to material characterizations and adding into the polymer.…”

Section: Experimental Sectionmentioning

confidence: 99%

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Functionalized Carbon Nanotube-Mediated Transport in Membranes Containing Fixed-Site Carriers for Fast Pervaporation Desalination

Yang

Xie

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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Facilitated transport membranes (FTMs) comprising fixed carrier agents hold considerable potential for obtaining selective and fast separation of mixed molecules in either gas or liquid state. However, diffusion through the membrane is inevitably affected by the resistance from the polymer matrix, where the carrier is absent. Herein, a poly(vinyl alcohol) (PVA)-based separating layer combining the merits of fixed-site transport agents and inorganic nanofillers was developed to reduce the transport resistance. Carbon nanotubes (CNTs) with different degrees of oxidation were prepared and incorporated into the sulfonic acid (−SO3H)-modified PVA matrix. The resultant composite membrane consisting of a microporous polytetrafluoroethylene substrate and a thin PVA-based separating layer (∼700 nm thick) was subject to pervaporation desalination of sodium chloride solution (35,000 ppm) at 30 °C. The effect of −SO3H as a fixed transport agent in the PVA matrix was first investigated experimentally, showing an increase of water flux by 21.8% compared with a control membrane without the transport agent. Subsequently, the CNT-incorporated FTM exhibited good stability (50 h) and improvement in water transport, which was ∼161% of the control FTM (PVA with −SO3H) without loss of selectivity. Such high and stable performance achieved in the CNT-incorporated FTM originated from the construction of low-resistance transport pathways by CNTs between −SO3H groups as well as their uniform dispersion in the polymer matrix.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

Functionalized Carbon Nanotube-Mediated Transport in Membranes Containing Fixed-Site Carriers for Fast Pervaporation Desalination

Yang

Xie

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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“…GoQDs have been integrated into poly(vinyl alcohol) and evenly cast on a polysulfone support membrane for PV. By integrating GOQDs on the membrane, the separation performance was changed with excellent dehydration of alcohol/water mixtures [162].…”

Section: Carbon Dot-based Polymer-nanocomposite Membranesmentioning

confidence: 99%

“…From Table 2, a comparative study shows that the permeation flux is higher when using GQDs and GoQDs as nanofillers in polymer nanocomposite membranes and the solvent rejection is on average mostly above 90% for all kinds of nanocomposite 0D carbon fillers. Nitrogen-doped GoQD 3-8 >10 and 30 nm at interface 500 to >3800 LMH while improving antibacterial properties [119] GoQDs sheets 15-20 -Decreased to 436.2 ± 27.4 g/m 2 h [162] Furthermore, the 0D carbon nano-forms are preferred over other types of fillers as they are ecofriendly, have easy fabrication processes, reduce the environmental pollution and enhance the economic profit. From the above mentioned 0D carbon fillers for polymer membrane fabrication, the resulting membranes opt to show good antifouling and anti-biofouling properties, more compact and stable structures, durability for long operating times (even at higher temperatures), superior resistance to chemical reagents, desirable surface hydrophilicity/hydrophobicity, enhanced membrane density, low toxicity, and long-term organic solvent stability.…”

Section: Carbon Dot-based Polymer-nanocomposite Membranesmentioning

confidence: 99%

Engineered Zero-Dimensional Fullerene/Carbon Dots-Polymer Based Nanocomposite Membranes for Wastewater Treatment

Jani

Pareja

Ni³

2020

Molecules

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With the rapid growth of industrialization, diverse pollutants produced as by-products are emitted to the air-water ecosystem, and toxic contamination of water is one of the most hazardous environmental issues. Various forms of carbon have been used for adsorption, electrochemical, and ion-exchange membrane filtration to separation processes for water treatment. The utilization of carbon materials has gained tremendous attention as they have exceptional properties such as chemical, mechanical, thermal, antibacterial activities, along with reinforcement capability and high thermal stability, that helps to maintain the ecological balance. Recently, engineered nano-carbon incorporated with polymer as a composite membrane has been spotlighted as a new and effective mode for water treatment. In particular, the properties of zero-dimensional (0D) carbon forms (fullerenes and carbon dots) have encouraged researchers to explore them in the field of wastewater treatment through membrane technologies as they are biocompatible, which is the ultimate requirement to ensure the safety of drinking water. Thus, the purpose of this review is to highlight and summarize current advances in the field of water purification/treatment using 0D carbon-polymer-based nanocomposite membranes. Particular emphasis is placed on the development of 0D carbon forms embedded into a variety of polymer membranes and their influence on the improved performance of the resulting membranes. Current challenges and opportunities for future research are discussed.

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“…The swelling degree of MMMs showed negligible influence upon the introduction of MOF-801, as compared with the CS membrane. PVA/GOQDs MMMs have also shown higher swelling resistance due to additional cross-linking reactive groups between –COOH from GOQDs and -OH from PVA [ 89 ].…”

Section: Effect Of Nanofillers On Polymer Matrixmentioning

confidence: 99%

Dimensional Nanofillers in Mixed Matrix Membranes for Pervaporation Separations: A Review

et al. 2020

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Pervaporation (PV) has been an intriguing membrane technology for separating liquid mixtures since its commercialization in the 1980s. The design of highly permselective materials used in this respect has made significant improvements in separation properties, such as selectivity, permeability, and long-term stability. Mixed-matrix membranes (MMMs), featuring inorganic fillers dispersed in a polymer matrix to form an organic–inorganic hybrid, have opened up a new avenue to facilely obtain high-performance PV membranes. The combination of inorganic fillers in a polymer matrix endows high flexibility in designing the required separation properties of the membranes, in which various fillers provide specific functions correlated to the separation process. This review discusses recent advances in the use of nanofillers in PV MMMs categorized by dimensions including zero-, one-, two- and three-dimensional nanomaterials. Furthermore, the impact of the nanofillers on the polymer matrix is described to provide in-depth understanding of the structure–performance relationship. Finally, the applications of nanofillers in MMMs for PV separation are summarized.

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Influence of integrating graphene oxide quantum dots on the fine structure characterization and alcohol dehydration performance of pervaporation composite membrane

Cited by 45 publications

References 65 publications

Functionalized Carbon Nanotube-Mediated Transport in Membranes Containing Fixed-Site Carriers for Fast Pervaporation Desalination

Functionalized Carbon Nanotube-Mediated Transport in Membranes Containing Fixed-Site Carriers for Fast Pervaporation Desalination

Engineered Zero-Dimensional Fullerene/Carbon Dots-Polymer Based Nanocomposite Membranes for Wastewater Treatment

Dimensional Nanofillers in Mixed Matrix Membranes for Pervaporation Separations: A Review

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