Synthesis of high flux forward osmosis membranes by chemically crosslinked layer-by-layer polyelectrolytes

Qiu, Changquan; Qi, Saren; Tang, Chuyang Y.

doi:10.1016/j.memsci.2011.07.013

Cited by 178 publications

(143 citation statements)

References 53 publications

Supporting

Mentioning

136

Contrasting

Order By: Relevance

“…These methods utilize osmotic pressure difference between a dilute feed solution and a concentrated draw solution to induce mass transport of water through semipermeable membranes from the feed stream into the draw solution. Increasing demand for water and electricity, combined with encouraging results from ODMP studies in recent years, have accelerated the development of ODMP technologies, including a flurry of membrane development work [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] intended to enable further improvement and commercialization of ODMPs.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the reported water and salt fluxes are scattered over a broad range. Testing conditions reported in recent publications on FO membrane development [7,8,12,13,15,[17][18][19][23][24][25][26][27][28][29] are summarized in Table 1. It can be seen from the data that both temperatures and draw solution concentrations are not consistent, and therefore, make membrane performance difficult to compare.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

et al. 2013

View full text Add to dashboard Cite

Osmotically driven membrane processes (ODMPs) such as forward osmosis (FO) and pressure retarded osmosis (PRO) are extensively investigated for utilization in a broad range of applications. In ODMPs, the operating conditions and membrane properties play more critical roles in mass transport and process performance than in pressure-driven membrane processes. Search of the literature reveals that ODMP membranes, especially newly developed ones, are tested under different temperatures, draw solution compositions and concentrations, flow rates, and pressures. In order to compare different membranes, it is important to develop standard protocols for testing of membranes for ODMPs. In this article we present a standard methodology for testing of ODMP membranes based on experience gained and operating conditions used in FO and PRO studies in recent years. A round-robin testing of two commercial membranes in seven independent laboratories revealed that water flux and membrane permeability coefficients were similar when participants performed the experiments and calculations using the same protocols. The thin film composite polyamide membrane exhibited higher water and salt permeability than the asymmetric cellulosebased membrane, but results with the high permeability thin-film composite membrane were more scattered. While salt rejection results in RO mode were relatively similar, salt permeability coefficients for both membranes in FO mode were more varied. Results suggest that high permeability ODMP membranes should be tested at lower hydraulic pressure in RO mode and that RO testing be conducted with the same membrane sample used for testing in FO mode. AbstractOsmotically driven membrane processes (ODMP) such as forward osmosis (FO) and pressure retarded osmosis (PRO) are extensively investigated for utilization in a broad range of applications. In ODMPs, the operating conditions and membrane properties play more critical roles in mass transport and process performance than in pressure-driven membrane processes.Search of the literature reveals that ODMP membranes, especially newly developed ones, are tested under different temperatures, draw solution compositions and concentrations, flowrates, and pressures. In order to compare different membranes, it is important to develop standard protocols for testing of membranes for ODMP. In this article we present a standard methodology for testing of ODMP membranes based on experience gained and operating conditions used in FO and PRO studies in recent years. A round-robin testing of two commercial membranes in seven independent laboratories revealed that water flux and membrane permeability coefficients were similar when participants performed the experiments and calculations using the same protocols. The thin film composite polyamide membrane exhibited higher water and salt permeability than the asymmetric cellulose-based membrane, but results with the high permeability thin-film composite membrane were more scattered. While salt rejection results in RO mode were...

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

et al. 2013

View full text Add to dashboard Cite

show abstract

“…For FO, the main direction of current research is towards improving intrinsic and transport properties of membranes on a molecular level [20][21][22][23][24][25][26][27][28]. However, the effects of these improvements on the energy efficiency of different FO desalination processes remain unexplored.…”

Section: Introductionmentioning

confidence: 99%

Energy consumption for desalination — A comparison of forward osmosis with reverse osmosis, and the potential for perfect membranes

2016

View full text Add to dashboard Cite

“…Previous research has examined the use of LbL films containing polyelectrolytes [43][44][45][46][47][48][49] and metalion complexed polymers 50 has been conducted on dip-assembled and spin-assembled LbL films to serve as selective layers in osmotic membranes. The flexibility of the LbL assembly process enables the incorporation of clay platelets into LbL-assembled films [51][52][53] , but there is a gap in the scientific literature concerning the use of LbL to generate nanostructured clay composite selective layers for RO membranes.…”

Section: Introductionmentioning

confidence: 99%

Spray Layer-by-Layer Assembled Clay Composite Thin Films as Selective Layers in Reverse Osmosis Membranes

Kovacs

Liu

Hammond

2015

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Spray layer-by-layer assembled thin films containing laponite (LAP) clay exhibit effective salt barrier and water permeability properties when applied as selective layers in reverse osmosis (RO) membranes. Negatively-charged LAP platelets were layered with poly(diallyldimethylammonium) (PDAC), poly(allylamine) (PAH), and poly(acrylic acid) (PAA) in bilayer and tetralayer film architectures to generate uniform films on the order of 100 nm thick that bridge a porous polyethersulfone support to form novel RO membranes. Nanostructures were formed of clay layers intercalated in a polymeric matrix that introduced size-exclusion transport mechanisms into the selective layer. Thermal cross-linking of the polymeric matrix can 2 be used to increase the mechanical stability of the films and improve salt rejection by constraining swelling during operation. Maximum salt rejection of 89% was observed for the tetralayer film architecture, with an order of magnitude increase in water permeability compared to commercially available TFC-HR membranes. These clay composite thin films could serve as a high-flux alternative to current polymeric RO membranes for wastewater and brackish water treatment as well as potentially for forward osmosis applications. In general, we illustrate that by investigating the composite systems accessed using alternating layer-by-layer assembly in conjunction with complementary covalent crosslinking, it is possible to design thin film membranes with tunable transport properties for water purification applications.

show abstract

Synthesis of high flux forward osmosis membranes by chemically crosslinked layer-by-layer polyelectrolytes

Cited by 178 publications

References 53 publications

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

Energy consumption for desalination — A comparison of forward osmosis with reverse osmosis, and the potential for perfect membranes

Spray Layer-by-Layer Assembled Clay Composite Thin Films as Selective Layers in Reverse Osmosis Membranes

Contact Info

Product

Resources

About