Thin film nanocomposite reverse osmosis membrane incorporated with UiO-66 nanoparticles for enhanced boron removal

Liu, Lifen; Xie, Xin; Qi, Saren; Li, Ruihan; Zhang, Xiao; Song, Xiaoxiao; Gao, Congjie

doi:10.1016/j.memsci.2019.02.072

Cited by 140 publications

(51 citation statements)

References 45 publications

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“…These NPs may also contribute to enhanced roughness for TFN-812S-0.1 and TFN-812S-0.5 membranes. Generally, the rougher surface of the TFN membrane helps to increase the direct water contact area and therefore renders greater water flux [ 24 , 29 , 33 , 36 ]. Although larger higher NPs concentration may benefit the water flux, it should be cautioned that when the doping concentration exceeded 0.1% ( w / v ), NPs aggregates are frequently observed on the PA surface due to the agglomeration of NPs when the NPs are concentrated significantly as the organic solvent evaporates [ 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

“…Fourier-transform infrared (FT-IR, Thermo Fisher Nicolet-is50, Shanghai, China) spectroscopy was used to analyze the functional groups of the different alkyl-silica NPs. The NPs were first mixed with KBr and then compressed into a semi-transparent pellet to measure the transmittance at room temperature over an infrared range from 400 to 4000 cm −1 [ 33 ]. Detailed information was obtained from the attenuated total reflection Fourier-transform infrared (ATR-FTIR) signal and analyzed to identify the functional groups on the membrane surfaces.…”

Section: Experiments and Methodsmentioning

confidence: 99%

“…The salt permeability coefficient, B value (L/m 2 ∙h), was calculated using the equation B = J (1 − R )/ R . To further analyze the transport process of boron, the permeability coefficient, Bs , of boron was calculated using the equation Js = Bs × (C f,B − C p,B ), where Js is the permeation flux of boron, C f,B and C p,B represent the concentrations of the feed solution and permeate solution, respectively [ 33 , 34 ]. The NaCl concentration was evaluated based on the conductivity, whereas the boron concentration was measured using an inductively coupled plasma-optical emission spectrometer (ICP-OES, PerkinElmer, AvioTM 200, Shanghai, China).…”

Section: Experiments and Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Facile Fabrication of High-Performance Thin Film Nanocomposite Desalination Membranes Imbedded with Alkyl Group-Capped Silica Nanoparticles

Wang

et al. 2020

Polymers

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The advantages of thin film nanocomposite reverse osmosis (TFN-RO) membranes have been demonstrated by numerous studies within the last decade. This study proposes a facile and novel method to tune the microscale and nanoscale structures, which has good potential to fabricate high-performance TFN-RO membranes. This method involves the addition of alkyl capped silica nanoparticles (alkyl-silica NPs) into the organic phase during interfacial polymerization (IP). We discovered for the first time that the high concentration alkyl-silica NPs in organic solvent isopar-G can limit the diffusion of MPD molecules at the interface, therefore shaping the intrinsic thickness and microstructures of the PA layer. Moreover, the alkyl group modification greatly reduces the NPs agglomeration and increases the compatibility between the NPs and the PA matrix. We further demonstrate that the doping of alkyl-silica NPs impacts the performance of the TFN-RO membrane by affecting intrinsic thickness, higher surface area, hydrophobic plugging effect, and higher surface charge by a series of characterization. At brackish water desalination conditions (2000 ppm NaCl, 1.55 MPa), the optimal brackish water flux was 55.3 L/m2∙h, and the rejection was maintained at 99.6%, or even exceeded this baseline. At seawater desalination conditions (32,000 ppm NaCl, 5.5 MPa), the optimized seawater flux reached 67.7 L/m2∙h, and the rejection was sustained at 99.4%. Moreover, the boron rejection was elevated by 11%, which benefits from a hydrophobic plugging effect of the alkyl groups.

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Section: Resultsmentioning

confidence: 99%

Section: Experiments and Methodsmentioning

confidence: 99%

Section: Experiments and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Facile Fabrication of High-Performance Thin Film Nanocomposite Desalination Membranes Imbedded with Alkyl Group-Capped Silica Nanoparticles

Wang

et al. 2020

Polymers

Self Cite

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“…In seawater desalination tests, the water flux was enhanced by 19% for TFN membranes containing 0.05% w / v over neat membrane while the salt rejection remained unchanged, whereas the boron rejection value was enhanced by 11% compared to the neat membrane. This enhancement can be attributed to the strong adsorption capacity for boron of the UiO-66 (11 mg/g) during short periods of time and due to its extraordinarily high surface area of 1121.6 (m 2 /g) [119].…”

Section: Mofs Applications In Water Purification Membranesmentioning

confidence: 99%

Metal Organic Framework Based Polymer Mixed Matrix Membranes: Review on Applications in Water Purification

et al. 2019

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Polymeric membranes have been widely employed for water purification applications. However, the trade-off issue between the selectivity and permeability has limited its use in various applications. Mixed matrix membranes (MMMs) were introduced to overcome this limitation and to enhance the properties and performance of polymeric membranes by incorporation of fillers such as silica and zeolites. Metal-organic frameworks (MOFs) are a new class of hybrid inorganic–organic materials that are introduced as novel fillers for incorporation in polymeric matrix to form composite membranes for different applications especially water desalination. A major advantage of MOFs over other inorganic fillers is the possibility of preparing different structures with different pore sizes and functionalities, which are designed especially for a targeted application. Different MMMs fabrication techniques have also been investigated to fabricate MMMs with pronounced properties for a specific application. Synthesis techniques include blending, layer-by-layer (LBL), gelatin-assisted seed growth and in situ growth that proved to give the most homogenous dispersion of MOFs within the organic matrix. It was found that the ideal filler loading of MOFs in different polymeric matrices is 10%, increasing the filler loading beyond this value led to formation of aggregates that significantly decreased the MOFs-MMMs performance. Despite the many merits of MOFs-MMMs, the main challenge facing the upscaling and wide commercial application of MOFs-MMMs is the difficult synthesis conditions of the MOFs itself and the stability and sustainability of MOFs-MMMs performance. Investigation of new MOFs and MOFs-MMMs synthesis techniques should be carried out for further industrial applications. Among these new synthesis methods, green MOFs synthesis has been highlighted as low cost, renewable, environmentally friendly and recyclable starting materials for MOFs-MMMs. This paper will focus on the investigation of the effect of different recently introduced MOFs on the performance of MOFs-MMMs in water purification applications.

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“…Over the last decades, nanoparticles (NPs) have been considerably studied by researchers. NPs have been used in water and wastewater treatment and diverse industries such as, paint, cement, sunscreen, and electronics [1][2][3][4][5][6]. Increasing the use of nanoparticles has been led to growing the release of nanoparticles into natural aquatic systems.…”

Section: Introductionmentioning

confidence: 99%

Fibrous adsorbent derived from sulfonation of cotton waste: application for removal of cadmium sulfide nanoparticles from aquatic media

et al. 2019

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In the present research, the performance of the cellulose sulfate microfibers (CSMFs) was investigated for the removal of cadmium sulfide nanoparticles (CdS NPs). At first, cotton waste was sulfonated by chlorosulfonic acid. The high sulfur content of the CSMFs (6.54%) and the absorbance bands appeared at 610 cm −1 (symmetric stretching vibrations) and 1205 and 1180 cm −1 (asymmetric stretching vibrations) in the FT-IR spectrum of CSMFs confirmed the successful modification of cotton microfibers. Optimizing the adsorption process was achieved using the response surface methodology. The impacts of the initial concentration of CdS NPs, contact time, total dissolved solids (TDS), and adsorbent concentration on the removal efficiency were assessed. The highest removal efficiency (about 100%) was obtained under optimum conditions. By increasing the TDS, the removal efficiency decreased slightly. University of Tehran, Radke-Prausnitz, and Redlich-Peterson models exhibited low error values. The high maximum adsorption capacity of 5533 mg g −1 was due to the high content of anionic surface groups. The kinetics data were consistent with the Elovich, intraparticle diffusion, and pseudo-second-order models. The rate constant of the pseudo-second-order model decreased by decreasing the concentration of CdS NPs. The adsorbent recovery decreased about 10% after four cycles of regeneration.

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Thin film nanocomposite reverse osmosis membrane incorporated with UiO-66 nanoparticles for enhanced boron removal

Cited by 140 publications

References 45 publications

Facile Fabrication of High-Performance Thin Film Nanocomposite Desalination Membranes Imbedded with Alkyl Group-Capped Silica Nanoparticles

Facile Fabrication of High-Performance Thin Film Nanocomposite Desalination Membranes Imbedded with Alkyl Group-Capped Silica Nanoparticles

Metal Organic Framework Based Polymer Mixed Matrix Membranes: Review on Applications in Water Purification

Fibrous adsorbent derived from sulfonation of cotton waste: application for removal of cadmium sulfide nanoparticles from aquatic media

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