Scaling Reduction in Carbon Nanotube-Immobilized Membrane during Membrane Distillation

Humoud, Madihah Saud; Roy, Sagar; Mitra, Somenath

doi:10.3390/w11122588

Cited by 16 publications

(6 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mechanism of water removal from kerosene during membrane filtration by hydrophobic CNIM is shown in Figure 6. In addition to hydrophobicity, CNTs also provide a significant active surface for partitioning the kerosene phase [14,15,23,29]. Rapid adsorption-desorption on the CNT surface resulted in active diffusion of the kerosene, which increased permeate flux [16,23,24,[30][31][32][33][34].…”

Section: Proposed Mechanismmentioning

confidence: 99%

“…Recently, we have demonstrated that immobilising CNTs in different types of membranes (referred to as CNIM) alters the solute-membrane interactions [13]. These have been used in diverse processes such as desalination, solvent recovery, and concentrating trace amount contaminants [14][15][16]. The CNIM-based membranes have also been used for generating medical-grade water by rejecting endotoxin [17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Carbon Nanotube Enhanced Filtration and Dewatering of Kerosene

et al. 2022

Self Cite

View full text Add to dashboard Cite

Current approaches to dewatering aviation fuel such as kerosene are adsorption by activated charcoal, gravity separation, etc. The objective of this work is to develop and demonstrate the filtration and dewatering of kerosene using a carbon nanotube immobilised membrane (CNIM). Highly hydrophobic membranes were prepared by immobilising carbon nanotube (CNTs) over polytetrafluoroethylene (PTFE) and polyvinylidene difluoride (PVDF) microfiltration membrane for the dewatering of ppm level water from kerosene. The effects of different CNT concentrations on membrane morphology, hydrophobicity, porosity, and permeability were characterised. After immobilising CNT into membranes, the contact angle increased by 9%, 16%, and 43% compared to unmodified 0.1 μm PTFE, 0.22 μm PTFE and 0.22 μm PVDF membranes, respectively. The CNIM showed remarkable separation efficiency for the fuel-water system. The micro/nano water droplets coalesced on the CNT surface to form larger diameters of water droplets detached from the membrane surface, leading to enhanced water rejection. In general, the water rejection increased with the amount of CNT immobilised while the effective surface porosity over pore length and flux decreased. PTFE base membrane showed better performance compared to the PVDF substrate. The CNIMs were fabricated with 0.1 and 0.22 μm PTFE at an optimised CNT loading of 3 and 6 wt.%, and the water rejection was 99.97% and 97.27%, respectively, while the kerosene fluxes were 43.22 kg/m2·h and 55.44 kg/m2·h respectively.

show abstract

Section: Proposed Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbon Nanotube Enhanced Filtration and Dewatering of Kerosene

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, we reported that CNIM shows relatively lower fouling as the CNTs act as nano-brushes that prevent the salt crystals from depositing on the surface [40]. The CNIM has shown high salt tolerance compared to pure polymeric membranes and has been used to treat water with TDS as high as 230,000 mg/L [41].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Performance of Carbon Nanotube Immobilized Membrane for the Treatment of High Salinity Produced Water via Direct Contact Membrane Distillation

2020

Self Cite

View full text Add to dashboard Cite

Membrane distillation (MD) is a promising desalination technology for the treatment of high salinity water. Here, we investigated the fouling characteristics of produced water obtained from hydraulic fracturing by implementing a carbon nanotube immobilized membrane (CNIM) via direct contact membrane distillation. The CNIM exhibited enhanced water vapor flux and antifouling characteristics compared to the pristine membrane. The normalized flux decline with the polytetrafluoroethylene (PTFE) membrane after 7 h of operation was found to be 18.2% more than the CNIM. The addition of 1-Hydroxy Ethylidene-1, 1-Diphosphonic acid (HEDP) antiscalant was found to be effective in reducing the membrane fouling. The salt deposition on the membrane surface was 77% less in the CNIM, which was further reduced with the addition of HEDP in the feed by up to 135.4% in comparison with the PTFE membrane. The presence of carbon nanotubes (CNTs) on the membrane surface also facilitated the regenerability of the membrane. The results indicated that the CNIM regained 90.9% of its initial water flux after washing, whereas the unmodified PTFE only regained 81.1% of its initial flux after five days of operation.

show abstract

“…Carbon nanotube immobilization on the membrane surface has shown significant enhancement in the solvent flux and selectivity by preferential sorption–desorption on the CNT surface. − We have reported the use of CNT-modified membranes for the recovery of fermentation products, concentrated dioxane, and enriching solvents. ,,, …”

Section: Introductionmentioning

confidence: 99%

Selective Recovery of Ethyl Acetate by Air-Sparged Membrane Distillation Using Carbon Nanotube-Immobilized Membranes and Process Optimization via a Response Surface Approach

Bhoumick

Paul

Roy

et al. 2023

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Ethyl acetate (EA) is an extensively used industrial solvent, and typically, aqueous mixtures containing EA are discarded as hazardous waste. The recovery of EA from wastewater streams would have significant environmental benefits and be a circular economy approach to solvent recycling. However, with a relatively high water solubility (8.3% w/v at room temperature), it remains a challenge. In this paper, we report the recovery of EA from water using air-sparged sweep gas membrane distillation (AS-SGMD) with carbon nanotube-immobilized membranes. A central composite rotatable design was used to study the effect of process parameters on flux and selectivity via conventional SGMD and AS-SGMD. The experiments were run at different operating conditions of temperature, concentration, and flow rate. The flux reached as high as 1.41 kg/m2 h–1, and selectivity as high as 10.8 was obtained. The introduction of air sparging improved the flux by as much as 12% and the selectivity by 17%. The response surfaces of flux and selectivity as a function of operating variables were studied, and regression models were developed. For both regular SGMD and AS-SGMD, the selectivity of EA recovery followed a quadratic model, while the flux showed a linear response. The predicted and experimental responses were in agreement with a R 2 value of 0.94. The optimization efforts showed that relatively low temperatures, higher concentrations, and high flow rates favored higher selectivity.

show abstract

Scaling Reduction in Carbon Nanotube-Immobilized Membrane during Membrane Distillation

Cited by 16 publications

References 59 publications

Carbon Nanotube Enhanced Filtration and Dewatering of Kerosene

Carbon Nanotube Enhanced Filtration and Dewatering of Kerosene

Enhanced Performance of Carbon Nanotube Immobilized Membrane for the Treatment of High Salinity Produced Water via Direct Contact Membrane Distillation

Selective Recovery of Ethyl Acetate by Air-Sparged Membrane Distillation Using Carbon Nanotube-Immobilized Membranes and Process Optimization via a Response Surface Approach

Contact Info

Product

Resources

About