Low-pressure loose GO composite membrane intercalated by CNT for effective dye/salt separation

Huang, Lili; Li, Zhiying; Luo, Yang; Zhang, Ning; Qi, Wenxu; Jiang, En; Bao, Junjiang; Zhang, Xiaopeng; An, Baigang

doi:10.1016/j.seppur.2020.117839

Cited by 97 publications

(18 citation statements)

References 48 publications

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“…As the result of the unique responsive properties, the membrane exhibits exceptional performance over previously reported membranes (Figure S12). − For the BABD membrane that does not have CB[7], the BABD molecules are prone to dimerization of their cation radical forms (Figure E). In the dimeric form, the two BABD molecules undergo π–π stacking interactions, ,, which decreases the free volume and pore size of the membrane.…”

Section: Resultsmentioning

confidence: 99%

Voltage-Gated Membranes Incorporating Cucurbit[n]uril Molecular Containers for Molecular Nanofiltration

et al. 2022

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Smart voltage-gated nanofiltration membranes have enormous potential for on-demand and precise separation of similar molecules, which is an essential element of sustainable water purification and resource recovery. However, the existing voltage-gated membranes are hampered by limited selectivity, stability, and scalability due to electroactive monomer dimerization. Here, for the first time, the host–guest recognition properties of cucurbit[7]uril (CB[7]) are used to protect the viologen derivatives and promote their assembly into the membrane by interfacial polymerization. Viologen functions as a voltage switch, whereas CB[7] complexation prevents its dimerization and improves its redox stability. The inhibited diffusion of the CB[7]-viologen complex enables the precise patterning of the surface structure. The resultant voltage-gated membrane displays 80% improved rejection performance, excellent recovery accuracy for similar molecules, and anti-fouling properties. This work not only provides an innovative strategy for the preparation of voltage-gated smart nanofiltration membranes but also opens up new avenues for ion-selective transmission in water treatment, bionic ion channels, and energy conversion.

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Section: Resultsmentioning

confidence: 99%

Voltage-Gated Membranes Incorporating Cucurbit[n]uril Molecular Containers for Molecular Nanofiltration

et al. 2022

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“…Nevertheless, the electrostatic repulsion between the negatively charged membrane surface and CR prevented some CR molecules from passing through the membrane layer. Furthermore, CR is easy to aggregate in an aqueous solution because of strong hydrogen bonds of intermolecular or π‐π stacking interactions, 50–52 which enhances the physical barrier of the membrane to CR. With the decrease of membrane surface pores, the physical barrier will increase sharply.…”

Section: Resultsmentioning

confidence: 99%

Tuning the microstructure of SMA/CPVC membrane for enhanced separation performance by adjusting the coagulation bath temperature

Chen

Luo

et al. 2022

J of Applied Polymer Sci

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In this study, styrene‐maleic anhydride copolymer/chlorinated polyvinyl chloride composite membranes were prepared via a non‐solvent induced phase separation technique. Different porous morphologies of the composite membranes were obtained by controlling the temperature of coagulation bath water. With the coagulation bath temperature increasing, the porous morphology of membrane surface changed from co‐continuous pores to isolated‐round‐pores, and its evolution mechanism was elaborated. The average pore size of membranes surface increased from 17.27 to 48.72 nm, the pure water flux increased from 225.50 to 624.47 L m−2 h−1, and the rejection rate of Congo red and bovine serum albumin declined gradually with the increase of coagulation bath temperature, but the NaCl rejection was less than 1.0%. The surface segregation behavior of anhydride groups was affected by the phase separation process, which in turn affects the anti‐fouling performance of membranes. The composite membranes obtained at the coagulation bath temperature of 20 and 30°C had large surface segregation of anhydride groups and excellent anti‐fouling performance. The water flux recovery rate is higher than 90% and the irreversible pollution decline rate is about 5.0%. Meanwhile, the obtained membranes, especially the membrane fabricated at a coagulation bath temperature of 0°C, has good dye/NaCl salt separation performance and can be used for the pretreatment of textile wastewater.

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“…Additives have been intercalated to expand the spacing between nanosheets, including organic spacers (e.g., CNTs, ,, graphitic carbon nitride (g-C 3 N 4 ), covalent organic frameworks (COFs), and chitin nanoycrystals (ChNC)) and inorganic spacers (e.g., metal organic frameworks (MOFs), − transition metal dichalcogenides (TMDs), ,, attapulgite nanorods (APTs), halloysite nanotubes (HNTs), MgSi, SiO 2 , and Fe 3 O 4 ). For instance, intercalating CNT and COF material (COF-1) increased GO interlayer spacings to 1.09 and 1.03 nm, respectively. These modifications greatly enhanced the water permeation and provided high rejection to water-soluble dyes (>95%).…”

Section: Nanocomposite Polymeric Membranes For Omp Removalmentioning

confidence: 99%

Nanocomposite Polymeric Membranes for Organic Micropollutant Removal: A Critical Review

Chen

Lee

et al. 2022

ACS EST Eng.

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The prevalence of organic micropollutants (OMPs) and their persistence in water supplies have raised serious concerns for drinking water safety and public health. Conventional water treatment technologies, including adsorption and biological treatment, are known to be insufficient in treating OMPs and have demonstrated poor selectivity toward a wide range of OMPs. Pressure-driven membrane filtration has the potential to remove many OMPs detected in water with high selectivity as a membrane's molecular weight cutoff (MWCO), surface charge, and hydrophilicity can be easily tailored to a targeted OMP's size, charge and octanol−water partition coefficient (K ow ). Over the past 10 years, polymeric (nano)composite microfiltration (MF), ultrafiltration (UF), and nanofiltration (NF) membranes have been extensively synthesized and studied for their ability to remove OMPs. This review discusses the fate and transport of emerging OMPs in water, an assessment of conventional membrane-based technologies (NF, reverse osmosis (RO), forward osmosis (FO), membrane distillation (MD) and UF membrane-based hybrid processes) for their removal, and a comparison to the state-of-the-art nanoenabled membranes with enhanced selectivity toward specific OMPs in water. Nanoenabled membranes for OMP treatment are further discussed with respect to their permeabilities, enhanced properties, limitations, and future improvements.

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Low-pressure loose GO composite membrane intercalated by CNT for effective dye/salt separation

Cited by 97 publications

References 48 publications

Voltage-Gated Membranes Incorporating Cucurbit[n]uril Molecular Containers for Molecular Nanofiltration

Voltage-Gated Membranes Incorporating Cucurbit[n]uril Molecular Containers for Molecular Nanofiltration

Tuning the microstructure of SMA/CPVC membrane for enhanced separation performance by adjusting the coagulation bath temperature

Nanocomposite Polymeric Membranes for Organic Micropollutant Removal: A Critical Review

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