Polyelectrolyte-Promoted Forward Osmosis–Membrane Distillation (FO–MD) Hybrid Process for Dye Wastewater Treatment

Ge, Qingchun; Wang, Peng; Wan, Chunfeng; Chung, Tai‐Shung

doi:10.1021/es300784h

Cited by 241 publications

(151 citation statements)

References 33 publications

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“…It is also observed that the viscosity of the solution of 0.5 g/mL concentrations is about 5 and 10 times those of 0.3 g/mL and 0.15 g/mL, respectively, probably due to the restricted salt diffusion with the concentration increase. Similar trends were also found in previous works, where polyelectrolytes with large molecular weights can't expand fully at high-concentration due to the limited space [23]. However, the viscosity of STPH solution of a low concentration of 0.5 g/mL is lower than that of most other reported draw solutions [17,[25][26][27], suggesting its great potential as a good draw solute candidate for FO applications.…”

Section: Concentration Effect Of Stph Solutionsupporting

confidence: 88%

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Sodium Tetraethylenepentamine Heptaacetate as Novel Draw Solute for Forward Osmosis—Synthesis, Application and Recovery

Long

Wang

2015

Energies

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Abstract:Osmotic energy, as a sustainable energy source with little environmental impact, has drawn much attention in both academia and industry in recent years. Osmotically driven membrane processes can harvest the osmotic energy and thus have great potential to produce sustainable clean water or electric energy. The draw solution, as an osmotic component, has been more and more explored by scientists in recent years in order to achieve a high osmotic pressure and suitable molecular size. In this work, a novel draw solute-sodium tetraethylenepentamine heptaacetate (STPH)-is synthesized and identified by nuclear magnetic resonance spectroscopy ( 1 H-NMR) and Fourier transform infrared (FTIR). Its solution properties are optimized in terms of the solution pH and concentration, and related to the forward osmosis (FO) performance. A water flux of 28.57 LMH and a low solute flux of 0.45 gMH can be generated with 0.5 g/mL STPH draw solution and de-ionized water (DI water) as the feed solution under pressure retarded osmosis (PRO) mode, which is superior to the FO performance with many other draw solutes reported. Further FO desalination test shows a stable water flux of 9.7 LMH with 0.3 g/mL STPH draw solution and 0.6 M NaCl feed solution. In addition, the draw solution recovery is also investigated.

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Section: Concentration Effect Of Stph Solutionsupporting

confidence: 88%

“…It is a common attribute that osmotic pressure is more sensitive to the component change of the draw solution, while the change of water flux could be retarded due to the combined effect of the solute diffusion coefficient, flow rate, diluted concentration polarization, etc. [23].…”

Section: Ph Optimization Of Sodium Tetraethylenepentamine Heptaacetatmentioning

confidence: 99%

Sodium Tetraethylenepentamine Heptaacetate as Novel Draw Solute for Forward Osmosis—Synthesis, Application and Recovery

Long

Wang

2015

Energies

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“…Considering the superiority of PAA-Na as draw solutes, they were used for acid dye wastewater treatment via an forward osmosis-membrane distillation (FO-MD) hybrid system. [79] In the FO-MD hybrid process, PAA-Na polyelectrolytes served as the draw solutes in the FO process to dehydrate the dye wastewater, meanwhile, the dilute PAA-Na solutions after FO were simultaneously concentrated through the MD process. With the integration of FO and MD, a continuous dye wastewater treatment process was established.…”

Section: Polyelectrolytes As Draw Solutesmentioning

confidence: 99%

Progress in Forward Osmosis Membrane Separation Process

Chen¹,

Xu²,

Ge³

2017

Self Cite

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Forward osmosis (FO) has been extensively investigated and demonstrated its advantages in a range of FO applications over the past decade. However, challenges still remain in terms of the lack of both efficient FO membranes and appropriate draw solutes for practical FO applications. To promote the advancement of FO technology, considerable efforts have been made in exploring novel FO membranes and draw solutes in recent years. This paper will provide a short review on the progress of both FO membranes and draw solutes. First of all, a brief overview on FO principle is given. Then the progress in FO technology related to FO membrane and draw solute is presented with specific examples. Finally, challenges and future directions of FO technology in exploring efficient FO membranes and promising draw solutes are also highlighted. This article may provide new insights into the future development of FO technology and promote practical FO applications.Keywords forward osmosis, draw solution, forward osmosis membrane, forward osmosis application IntroductionFreshwater shortage has been becoming a more and more severe problem globally. [1][2][3][4] To mitigate this problem, various technologies for clean water production have been explored worldwide recently. [5][6][7][8][9] Membrane technology has shown a great potential in water treatment in view of the advantages of no phase change, strong adaptability, relatively simple operation and low cost. [5,[10][11][12] A range of pressure-driven membrane processes, such as microfiltration (MF), [13][14][15][16] ultrafiltration (UF), [13,17,18] nanofiltration (NF), [19][20][21] and reverse osmosis (RO) [22][23][24][25][26] have been extensively used for clean water production through either wastewater reuse or brackish water/ seawater desalination. However, some issues, such as severe membrane fouling, low water recovery rate, intensive-energy consumption and relatively low quality of product water, occur frequently during these processes. [10,13,17,23,27] FO has been recognized as a promising membrane process because of the following characteristics: (1) no requirement of hydraulic pressure; (2) a relatively high water recovery rate; (3) low membrane fouling propensity due to the absence of hydraulic pressure; (4) environmental friendliness. Given these merits, FO technology has been applied to a wide range of fields, such as seawater/brackish water desalination, [4,24,28] wastewater treatment, [8,[29][30][31] and many other areas. [32][33][34][35][36] Although FO exhibits a great potential in alleviating the issues caused by freshwater shortage, challenges, such as relatively low water permeability, high reverse solute diffusion, severe concentration polarization (CP), and membrane fouling, are still present in FO applications. [37][38][39] To eliminate these problems, exploration of appropriate semi-permeable FO membrane and draw solute is urgently needed. Great efforts have been made in the development of FO technology in recent years, and a wide range of powerful FO membra...

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“…A number of physical and physicochemical technologies have been developed for the removal of dyes from aqueous solutions, including adsorption techniques [3,4], membrane processes [5,6], and degradation of dyes through oxidation under the assistant of catalysts [7][8][9][10]. Various materials have been used as adsorbents for the removal of dyes, such as biocoagulants [1], fruit peels [3], and cellulose-based bioadsorbents [4].…”

Section: Introductionmentioning

confidence: 99%

Core-Shell MnO2-SiO2 Nanorods for Catalyzing the Removal of Dyes from Water

Gong

Meng

2017

Catalysts

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This work presented a novel core-shell MnO 2 @m-SiO 2 for catalyzing the removal of dyes from wastewater. MnO 2 nanorods were sequentially coated with polydopamine (PDA) and polyethyleneimine (PEI) forming MnO 2 @PDA-PEI. By taking advantage of the positively charged amine groups, MnO 2 @PDA-PEI was further silicificated, forming MnO 2 @PDA-PEI-SiO 2 . After calcination, the composite MnO 2 @m-SiO 2 was finally obtained. MnO 2 nanorod is the core and mesoporous SiO 2 (m-SiO 2 ) is the shell. MnO 2 @m-SiO 2 has been used to degrade a model dye Rhodamine B (RhB). The shell m-SiO 2 functioned to adsorb/enrich and transfer RhB, and the core MnO 2 nanorods oxidized RhB. Thus, MnO 2 @m-SiO 2 combines multiple functions together. Experimental results demonstrated that MnO 2 @m-SiO 2 exhibited a much higher efficiency for degradation of RhB than MnO 2 . The RhB decoloration and degradation efficiencies were 98.7% and 84.9%, respectively. Consecutive use of MnO 2 @m-SiO 2 has demonstrated that MnO 2 @m-SiO 2 can be used to catalyze multiple cycles of RhB degradation. After six cycles of reuse of MnO 2 @m-SiO 2 , the RhB decoloration and degradation efficiencies were 98.2% and 71.1%, respectively.

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Polyelectrolyte-Promoted Forward Osmosis–Membrane Distillation (FO–MD) Hybrid Process for Dye Wastewater Treatment

Cited by 241 publications

References 33 publications

Sodium Tetraethylenepentamine Heptaacetate as Novel Draw Solute for Forward Osmosis—Synthesis, Application and Recovery

Sodium Tetraethylenepentamine Heptaacetate as Novel Draw Solute for Forward Osmosis—Synthesis, Application and Recovery

Progress in Forward Osmosis Membrane Separation Process

Core-Shell MnO2-SiO2 Nanorods for Catalyzing the Removal of Dyes from Water

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