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Williams, Michael E.; Bhattacharyya, Dibakar; Ray, Roderick J.; McCray, Scott B.

doi:10.1007/978-1-4615-3548-5_24

Cited by 11 publications

(4 citation statements)

References 117 publications

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“…Although precipitation, ion exchange, or reverse osmosis (Williams et al, 1992) can remove heavy metals from water, they create an additional sludge and/ or are costly.…”

Section: Introductionmentioning

confidence: 99%

Heavy metal removal and recovery by contained liquid membrane permeator

et al. 1994

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“…Although precipitation, ion exchange, or reverse osmosis (Williams et al, 1992) can remove heavy metals from water, they create an additional sludge and/ or are costly.…”

Section: Introductionmentioning

confidence: 99%

Heavy metal removal and recovery by contained liquid membrane permeator

et al. 1994

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“…In a typical process ( Williams et al, 1992 ), 3.53 g of PSF powder was dispersed in 20 mL 1-methyl-2-pyrrolidone. Then, casting solution was stirred for 12 h and sonicated for 1 h and kept standing for 6 h to more air bubbles.…”

Section: Methodsmentioning

confidence: 99%

Confined assembly of ultrathin nanoporous nitrogen-doped graphene nanofilms with dual metal coordination chemistry

Zhang

et al. 2021

iScience

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Summary Graphene oxide (GO) nanosheets with unique structure have received much attention in providing opportunity for high-performance membranes in separation. However, the rational design of ultrathin graphene membranes with controlled structures remains a big challenge. Here, we report a methodology to synthesize dual metal-coordinated ultrathin nanoporous graphene nanofilms by tailoring well-aligned nanocrystals as building blocks on heteroatom-doped GO nanosheets with tunable architectures. Manipulation of metal nitrate as bifunctional dopants realizes N-doping of graphene oxide and preferential growth of α-Mn 2 O 3 nanocrystals. Generation of Mn-O-C bond during cross-linking greatly strengthens the stability of membranes for long-term steady operation. Meanwhile, because of spatial confinement effects and high binding energy, N-doped reduced GO nanosheets are desirable supports to construct numerous Mn-N-C bonds, thus generating artificial nanopores to significantly increase nanochannels for ultrafast mass transport. Moreover, the size-selective permeability of ultrathin nanoporous GO-based nanofilms can be optimized by managing the types of metal source for target coordination.

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“…Pressure-driven separations are wonderful separation techniques, in particular, membrane technology is widely applicable in many areas, such as chemical and biochemical processes, stream separation, seawater desalination, removal of heavy metals from waste effluents, and purification of potable water. − In particular, nanofiltration (NF) and reverse osmosis (RO) are more powerful tools widely used in desalination and purification processes. The porous membrane is a major tool in both NF and RO techniques.…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization and Performance Study of Poly(isobutylene-alt-maleic anhydride) [PIAM] and Polysulfone [PSf] Composite Membranes before and after Alkali Treatment

Padaki

Isloor

Belavadi

et al. 2011

Ind. Eng. Chem. Res.

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Recently, nanofiltration (NF) membranes have been drawing much attention in the field of filtration and the purification process of water/industrial effluents, because of their energy efficiency and low cost. Although reverse osmosis (RO) membranes are widely used in present desalination units, NF membranes are considered as "future membranes" for desalination, because of the low operating pressure. In the present paper, we hereby report the synthesis of a new composite NF membranes of poly(isobutylene-alt-maleic anhydride) (PIAM) with polysulfone, using a diffusion-induced phase separation (DIPS) method. The anhydride groups were converted to acid group by alkaline treatment. Newly prepared composite membranes were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC) studies. The membranes were tested for salt rejection and water swelling. The resulted NF membranes exhibited significantly enhanced water permeability while retaining high salt rejection. The flux and rejection rate of the NF membrane to Na 2 SO 4 (500 ppm) reached to 11.73 L/(m 2 h) and 49% rejection under 1 MPa and also 70:30 composition of the membrane showed 54% water swelling; contact angle measurement, ion exchange capacity, and water uptake of the membrane were recorded.

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Selected Applications

Cited by 11 publications

References 117 publications

Heavy metal removal and recovery by contained liquid membrane permeator

Heavy metal removal and recovery by contained liquid membrane permeator

Confined assembly of ultrathin nanoporous nitrogen-doped graphene nanofilms with dual metal coordination chemistry

Preparation, Characterization and Performance Study of Poly(isobutylene-alt-maleic anhydride) [PIAM] and Polysulfone [PSf] Composite Membranes before and after Alkali Treatment

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