In Situ Surface Modification of Thin-Film Composite Polyamide Membrane with Zwitterions for Enhanced Chlorine Resistance and Transport Properties

Wang, Jing; Si, Zhiyong; Wu, Pengfei; Shi, Wenxiong; Zhi, Wei; Hu, Yunxia

doi:10.1021/acsami.8b21572

Cited by 84 publications

(27 citation statements)

References 59 publications

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“…[ 15 ] In addition, the characteristic absorption of imidazoliums in DAIB may be masked by polyamide, which has been observed in the previous works. [ 15,39,40 ] Thus, no new FTIR peak was observed in the DAIB membrane. Moreover, the whole network cross‐linking degree of DAIB membranes was slightly reduced compared to PEI–TMC membranes without DAIB modification (Figure S5, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

Peng

Zhen

2021

Adv Funct Materials

181

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Lithium extraction from salt lake brines is highly demanded to circumvent the lithium supply shortage. However, polymer nanofiltration membranes suffer from low lithium permeability while nanofluidic devices are hindered by complicated preparation and miniaturized scales despite high permeability. Here, the authors report a facile strategy to prepare positively charged nanofiltration membranes for ultrapermeable and selective separation of lithium ions from concentrated magnesium/lithium mixtures. A new electrolyte monomer (diaminoethimidazole bromide, DAIB) containing bidentate amine groups is designed to modify pristine polyamide composite membranes. Structure characterizations and simulations show that the DAIB modification brings about nano-heterogeneity that not only improves surface hydrophilicity, but also reduces water transport resistance through the ≈100 nm thick separation layer. Water permeance of the modified membrane improves fivefold and is coupled with good stability in 200-h continuous nanofiltration. It exhibits high lithium flux (0.7 mol m −2 h −1) for brines (Mg 2+ /Li + ratio 20) at 6 bar operation pressure.

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Section: Resultsmentioning

confidence: 99%

A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

Peng

Zhen

2021

Adv Funct Materials

181

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“…As shown in Figure 9d, Wang et al carried out in situ surface modification of TFC membrane through the assembly of quaternized 2,6‐diaminopyridine (DAP) zwitterion layer that can render chlorine‐attack resistance and facilitate fast water transport. [ 120 ] Without sufficiently thin layer, the zwitterion construction enhanced the hydrophilicity and roughness of the membrane, which in turn improved the water permeability of the modified membrane to 4.8 Lm −2 h −1 bar −1 with 99.7% salt rejection.…”

Section: Strategies For Energy Reduction In Desalination Processesmentioning

confidence: 99%

Energy Efficient Seawater Desalination: Strategies and Opportunities

2021

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With the change in climate patterns, rapid industrialization, and population growth, the increasing water and energy demand became a major concern in the past decades. Desalination has been touted as the answer to the global water crisis, due to its capability in producing high‐quality fresh water from saline water. The continual research and innovations in the desalination field have resulted in the commercialization of large‐scale desalination in many water scarce regions. In the energetic context, all desalination processes are energy intensive. With the necessity to make desalination a more affordable and sustainable process, the energy efficiency of desalination is becoming an important topic. Herein, it is aimed to provide insights into the recent efforts and strategies established to tackle the energy‐related issues of both, thermal‐based and membrane‐based desalination processes. Depending on the principle of various commercial and emerging desalination processes, the directions of energy efficiency improvements, which include operating condition optimization, high‐performance material development, and renewable energy exploitation are discussed. The ideas and strategies reviewed herein, whether in their implementation or theoretical stage, are expected to provide insights into the possible improvement for application in commercial desalination plants.

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“…Most used NF membranes are polyamide thin film composite membranes on microporous support. However, the polyamide NF membranes are prone to fouling and exhibit less stability towards chlorine [ 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Electrospun Composite Nanofiltration Membranes for Arsenic Removal

et al. 2022

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In recent years, significant attention has been paid towards the study and application of mixed matrix nanofibrous membranes for water treatment. The focus of this study is to develop and characterize functional polysulfone (PSf)-based composite nanofiltration (NF) membranes comprising two different oxides, such as graphene oxide (GO) and zinc oxide (ZnO) for arsenic removal from water. PSf/GO- and PSf/ZnO-mixed matrix NF membranes were fabricated using the electrospinning technique, and subsequently examined for their physicochemical properties and evaluated for their performance for arsenite–As(III) and arsenate–As(V) rejection. The effect of GO and ZnO on the morphology, hierarchical structure, and hydrophilicity of fabricated membranes was studied using a scanning electron microscope (SEM), small and ultra-small angle neutron scattering (USANS and SANS), contact angle, zeta potential, and BET (Brunauer, Emmett and Teller) surface area analysis. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were used to study the elemental compositions and polymer-oxide interaction in the membranes. The incorporation of GO and ZnO in PSf matrix reduced the fiber diameter but increased the porosity, hydrophilicity, and surface negative charge of the membranes. Among five membrane systems, PSf with 1% ZnO has the highest water permeability of 13, 13 and 11 L h−1 m−2 bar−1 for pure water, As(III), and As(V)-contaminated water, respectively. The composite NF membranes of PSf and ZnO exhibited enhanced (more than twice) arsenite removal (at 5 bar pressure) of 71% as compared to pristine PSf membranes, at 43%, whereas both membranes showed only a 27% removal for arsenate.

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In Situ Surface Modification of Thin-Film Composite Polyamide Membrane with Zwitterions for Enhanced Chlorine Resistance and Transport Properties

Cited by 84 publications

References 59 publications

A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

Energy Efficient Seawater Desalination: Strategies and Opportunities

Electrospun Composite Nanofiltration Membranes for Arsenic Removal

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