Functionalized carbon nanotube immobilized membrane for low temperature ammonia removal via membrane distillation

Intrchom, Worawit; Roy, Sagar; Mitra, Somenath

doi:10.1016/j.seppur.2019.116188

Cited by 38 publications

(25 citation statements)

References 56 publications

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“…CNIM-f was fabricated by the procedure, as explained in our recent paper [23]. 1.5 mg of f-CNTs was mixed with 8 g of acetone and uniformly dispersed by an ultrasonic bath for 4 h. The PVDF solution used as a binder was separately prepared by dissolving 0.2 mg of PVDF in 2 g of acetone and added to f-CNTs solution.…”

Section: Cnim-f and Goim Fabrication And Characterizationmentioning

confidence: 99%

“…Water and 2.5% MTBE solution were used in the contact angle measurement. A micro syringe (Hamilton 0−100 µL) was employed to create 2 µL droplets for the measurement as the method described in our previous paper [23]. Surface free energy of the unmodified and modified membranes was calculated from contact angle data following the Owens−Wendt (extended Fowkes) model [37] by using water, ethylene glycol, glycerol and propanol as test liquids [38].…”

Section: Cnim-f and Goim Fabrication And Characterizationmentioning

confidence: 99%

“…The main advantages of MD include high rejection of non-volatile species and relatively low membrane fouling. Furthermore, a low-grade energy, such as solar/geothermal energy, and industrial waste heat, have been efficiently used as a heat source, since MD can be operated at low temperature (30-70 • C) [20,22,23]. A key element of the MD system is the membrane, which directly influences the separation performances.…”

Section: Introductionmentioning

confidence: 99%

“…However, they tend to be very hydrophobic, and show little affinity for MTBE. We have reported a membrane modification approach using carbon nanotubes (CNTs), f-CNTs and GO [29][30][31][32][33] to improve the characteristics of the membrane, and have shown an excellent adsorption and transport of solutes, leading enhanced flux and selectivity in desalination, as well as the separation of organic solvents from aqueous mixtures [21,23,31]. Although several techniques have been tested for MTBE removal from aqueous solution, few studies have investigated the removal using vacuum MD [34,35].…”

Section: Introductionmentioning

confidence: 99%

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Removal and Recovery of Methyl Tertiary Butyl Ether (MTBE) from Water Using Carbon Nanotube and Graphene Oxide Immobilized Membranes

2020

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Methyl tert-butyl ether (MTBE) is a widely used gasoline additive that has high water solubility, and is difficult to separate from contaminated ground and surface waters. We present the development in functionalized carbon nanotube-immobilized membranes (CNIM-f) and graphene oxide-immobilized membranes (GOIM) for enhanced separation of MTBE via sweep gas membrane distillation (SGMD). Both types of modified membranes demonstrated high performance in MTBE removal from its aqueous mixture. Among the membranes studied, CNIM-f provided the best performance in terms of flux, removal efficiency, mass transfer coefficients and overall selectivity. The immobilization f-CNTs and GO altered the surface characteristics of the membrane and enhanced partition coefficients, and thus assisted MTBE transport across the membrane. The MTBE flux reached as high as 1.4 kg/m2 h with f-CNTs, which was 22% higher than that of the unmodified PTFE membrane. The maximum MTBE removal using CNIM-f reached 56% at 0.5 wt % of the MTBE in water, and at a temperature of 30 °C. With selectivity as high as 60, MTBE recovery from contaminated water is very viable using these nanocarbon-immobilized membranes.

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Section: Cnim-f and Goim Fabrication And Characterizationmentioning

confidence: 99%

Section: Cnim-f and Goim Fabrication And Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Removal and Recovery of Methyl Tertiary Butyl Ether (MTBE) from Water Using Carbon Nanotube and Graphene Oxide Immobilized Membranes

2020

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“…AFM images from our previous studies have shown that the incorporation of CNTs on membrane surface also increases the surface roughness [45]. The gas permeation test of the membranes demonstrated no significant change in the effective surface porosity over the effective pore length of the membranes as only a small quantity of CNTs were immobilized on the membrane surface [42,46]. The thermal stability of the PP membrane and CNIM was studied using TGA.…”

Section: Dcmd Performancementioning

confidence: 99%

Scaling Reduction in Carbon Nanotube-Immobilized Membrane during Membrane Distillation

Humoud

Roy

Mitra

2019

Water

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Membrane distillation (MD) is fast evolving as a desalination technology for high-salinity waters where scaling remains a major challenge. This paper reports the scaling reduction in carbon nanotube-immobilized membranes (CNIMs) and by the use of the antiscalant polyacrylic acid. High concentrations of CaSO 4 , CaCO 3 , and BaSO 4 were deliberately used to initiate scaling on the membranes. It was observed that after ten hours of operation in a highly scaling CaSO 4 environment, the CNIM showed 127% higher flux than what was observed on a membrane without the CNTs. The trends were similar with CaCO 3 and BaSO 4 , where the CNIM showed significantly improved antiscaling behavior. The normalized flux declination for CNIM was found to be 45%, 30%, and 53% lower compared to the pristine membrane with CaSO 4 , CaCO 3 , and BaSO 4 solutions, respectively. The use of antiscalant in the feed solution was also found to be effective in improving antiscaling behavior, which reduced salt deposition up to 28%, and the water vapor flux was 100% and 18% higher for the pristine polypropylene and CNIM, respectively. Results also showed that the presence of CNTs facilitated the removal of deposited salts by washing, and the CNIM regained 97% of its initial water flux, whereas the polypropylene only regained 85% of the original value.

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Advancements in Nanoenabled Membrane Distillation for a Sustainable Water‐Energy‐Environment Nexus

Farid,

Kharraz,

Sun

et al. 2023

Advanced Materials

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The emergence of nano innovations in membrane distillation (MD) has garnered increasing scientific interest. This enabled the exploration of state‐of‐the‐art nano‐enabled MD membranes with desirable properties, which significantly improve the efficiency and reliability of the MD process and open up opportunities for achieving sustainable water‐energy‐environment (WEE) nexus. This comprehensive review provides broad coverage and in‐depth analysis of recent innovations in nano‐enabled MD membranes, focusing on their role in achieving desirable properties, such as strong liquid‐repellence, high resistance to scaling, fouling, and wetting, as well as efficient self‐heating and self‐cleaning functionalities. The recent developments in nano‐enhanced photothermal‐catalytic applications for water‐energy co‐generation within a single MD system are also discussed. Furthermore, we identify the bottlenecks that impede the scale‐up of nano‐enhanced MD membranes and propose a future roadmap for their sustainable commercialization. This holistic overview is expected to inspire future research and development efforts to fully harness the potential of nano‐enabled MD membranes to achieve sustainable integration of water, energy, and the environment.This article is protected by copyright. All rights reserved

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Functionalized carbon nanotube immobilized membrane for low temperature ammonia removal via membrane distillation

Cited by 38 publications

References 56 publications

Removal and Recovery of Methyl Tertiary Butyl Ether (MTBE) from Water Using Carbon Nanotube and Graphene Oxide Immobilized Membranes

Removal and Recovery of Methyl Tertiary Butyl Ether (MTBE) from Water Using Carbon Nanotube and Graphene Oxide Immobilized Membranes

Scaling Reduction in Carbon Nanotube-Immobilized Membrane during Membrane Distillation

Advancements in Nanoenabled Membrane Distillation for a Sustainable Water‐Energy‐Environment Nexus

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