Extraction of volatile organic compounds from water and wastewater by vacuum-driven membrane process: A comprehensive review

Fatima, Sana; Govardhan, Bapanipally; Kalyani, Swayampakula; Sridhar, S.

doi:10.1016/j.cej.2022.134664

Cited by 33 publications

(6 citation statements)

References 142 publications

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“…Carbon nanotubes (CNTs) are one of the most investigated nanomaterials based on their smooth inner/outer walls, open ends, and unique tubular morphology with a high aspect ratio . This special structural property enables the CNT-containing composite membrane materials to achieve many superior characteristics and performance, like high-efficiency mass transfer, strong hydrophobicity, and excellent mechanical properties. − Therefore, MMMs composed of carbon nanotubes have already been intensively studied and widely applied to gas separation and water purification. For example, Kim et al added CNTs to PDMS and demonstrated that the presence of smooth channels of CNTs promoted the gas permeability of O 2 , N 2 , and CH 4 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Carbon Nanotube Filled PDMS Hybrid Membranes for Enhanced Ethanol Recovery

Tian

et al. 2023

ACS Appl. Mater. Interfaces

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Ethanol separation via the pervaporation process has shown growing application potential in solvent recovery and the bioethanol industry. In the continuous pervaporation process, polymeric membranes such as hydrophobic polydimethylsiloxane (PDMS) have been developed to enrich/ separate ethanol from dilute aqueous solutions. However, its practical application remains largely limited due to the relatively low separation efficiency, especially in selectivity. In view of this, hydrophobic carbon nanotube (CNT) filled PDMS mixed matrix membranes (MMMs) aimed at high-efficiency ethanol recovery were fabricated in this work. The filler K-MWCNTs was prepared by functionalizing MWCNT-NH 2 with epoxycontaining silane coupling agent (KH560) to improve the affinity between fillers and PDMS matrix. With K-MWCNT loading increased from 1 wt % to 10 wt %, membranes showed higher surface roughness and water contact angle was improved from 115°to 130°. The swelling degree of K-MWCNT/ PDMS MMMs (2 wt %) in water were also reduced from 10 wt % to 2.5 wt %. Pervaporation performance for K-MWCNT/PDMS MMMs under varied feed concentrations and temperatures were evaluated. The results supported that the K-MWCNT/PDMS MMMs at 2 wt % K-MWCNT loading showed the optimum separation performance (compared with pure PDMS membranes), with the separation factor improved from 9.1 to 10.4, and the permeate flux increased by 50% (40−60 °C, at 6 wt % feed ethanol concentration). This work provides a promising method for preparing a PDMS composite with both high permeate flux and selectivity, which showed great potential for bioethanol production and alcohol separation in industry.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Carbon Nanotube Filled PDMS Hybrid Membranes for Enhanced Ethanol Recovery

Tian

et al. 2023

ACS Appl. Mater. Interfaces

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“…Although some thermal separation processes, such as distillation, are commonly used in industry, these methods may have drawbacks such as high energy consumption and the formation of azeotropes. 5 As low-carbon and sustainable development become increasingly important, more efficient and cost-effective technologies A pervaporation membrane with fast and selective permeation is key to improving the recovery efficiency of volatile organic compounds (VOCs) from water. Polydimethylsiloxane (PDMS)-based mixed matrix membranes (MMMs) are widely deployed to remove or recover VOCs via pervaporation.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…As low-carbon and sustainable development become increasingly important, more efficient and cost-effective technologies must be implemented for the recovery or removal of VOCs. Various techniques, such as adsorption, 6 bioreactions, 7 anaerobic/aerobic biological treatment, 8 oxidation 9 and membrane technology, 5,10 have recently been used. Among these techniques, pervaporation (PV) offers a promising alternative due to its unique advantages such as ease of operation, low energy consumption, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

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Superoleophilic conjugated microporous polymer nano-surfactants for realizing unprecedented fast recovery of volatile organic compounds

et al. 2023

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“…Volatile organic compounds (VOCs), such as ethyl acetate, are present in chemical effluents and are considered harmful due to their impact on the environment [1]. These pollutants, originating from wastewater units, easily enter the air and indirectly impact human health [2,3].…”

Section: Introductionmentioning

confidence: 99%

Pollution and Cleaning of PDMS Pervaporation Membranes after Recovering Ethyl Acetate from Aqueous Saline Solutions

et al. 2022

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The removal of volatile organic compounds (VOCs) from wastewater containing nonvolatile salts has become an important and interesting case of the application of the pervaporation (PV) process. The aim of this study was to evaluate the influence of salts on the PV removal of ethyl acetate from wastewater using a polydimethylsiloxane (PDMS) membrane. The fouled membrane was then characterized via scanning electron microscopy–energy-dispersive X-ray analysis (SEM–EDX) to investigate salt permeation. The membrane backflushing process was carried out by periodically flushing the permeate side of the tubular membrane. The results demonstrated that salts (NaCl and CaCl2) could permeate through the PDMS membrane and were deposited on the permeate side. The presence of salts in the feed solution caused a slight increase in the membrane selectivity and a decrease in the permeate flux. The flux decreased with increasing salt concentration, and a notable effect occurred at higher feed-salt concentrations. A permeate flux of up to 98.3% of the original flux was recovered when the permeation time and backflushing duration were 30 and 5 min, respectively, indicating that the effect of salt deposition on flux reduction could be mitigated. Real, organic, saline wastewater was treated in a pilot plant, which further verified the feasibility of wastewater PV treatment.

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Extraction of volatile organic compounds from water and wastewater by vacuum-driven membrane process: A comprehensive review

Cited by 33 publications

References 142 publications

Fabrication and Characterization of Carbon Nanotube Filled PDMS Hybrid Membranes for Enhanced Ethanol Recovery

Fabrication and Characterization of Carbon Nanotube Filled PDMS Hybrid Membranes for Enhanced Ethanol Recovery

Superoleophilic conjugated microporous polymer nano-surfactants for realizing unprecedented fast recovery of volatile organic compounds

Pollution and Cleaning of PDMS Pervaporation Membranes after Recovering Ethyl Acetate from Aqueous Saline Solutions

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