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Gopalakrishnan A, Janardhanan DV, Sasi S, Aravindakumar CT, Aravind UK. Organic micropollutant removal and phosphate recovery by polyelectrolyte multilayer membranes: Impact of buildup interactions. CHEMOSPHERE 2024; 350:141078. [PMID: 38160944 DOI: 10.1016/j.chemosphere.2023.141078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 10/02/2023] [Accepted: 12/28/2023] [Indexed: 01/03/2024]
Abstract
Polyelectrolyte multilayer (PEM) deposition conditions can favorably or adversely affect the membrane filtration performance of various pollutants. Although pH and ionic strength have been proven to alter the characteristics of PEM, their role in determining the buildup interactions that control filtration efficacy has not yet been conclusively proved. A PEM constructed using electrostatic or non-electrostatic interactions from controlled deposition of a weak polyelectrolyte could retain both charged and uncharged pollutants from water. The fundamental relationship between polyelectrolyte charge density, PEM buildup interaction, and filtration performance was explored using a weak-strong electrolyte pair consisting of branching poly (ethyleneimine) and poly (styrene sulfonate) (PSS) across pH ranges of 4-10 and NaCl concentrations of 0 M-0.5 M. PEI/PSS multilayers at acidic pH were dominated by electrostatic interactions, which favored the selective removal of a charged solute, phosphate over chloride, while at alkaline pH, non-electrostatic interactions dominated, which favored the removal of oxybenzone (OXY), a neutral hydrophobic solute. The key factor determining these interactions was the charge density of PEI, which is controlled by pH and ionic strength of the deposition solutions. These findings indicate that the control of buildup interactions can largely influence the physico-chemical and transport characteristics of PEM membranes.
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Affiliation(s)
- Akhil Gopalakrishnan
- Advanced Centre of Environment Studies and Sustainable Development, Mahatma Gandhi University, Kottayam, India
| | - Disha V Janardhanan
- Advanced Centre of Environment Studies and Sustainable Development, Mahatma Gandhi University, Kottayam, India
| | - Subha Sasi
- Advanced Centre of Environment Studies and Sustainable Development, Mahatma Gandhi University, Kottayam, India
| | - Charuvila T Aravindakumar
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam, India; Inter University Instrumentation Centre, Mahatma Gandhi University, Kottayam, India
| | - Usha K Aravind
- Advanced Centre of Environment Studies and Sustainable Development, Mahatma Gandhi University, Kottayam, India; School of Environmental Studies, Cochin University of Science and Technology, Kochi-682022, Kerala, India.
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2
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Li X, Shen S, Xu Y, Guo T, Dai H, Lu X. Mining phosphorus from waste streams at wastewater treatment plants: a review of enrichment, extraction, and crystallization methods. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:28407-28421. [PMID: 36680723 DOI: 10.1007/s11356-023-25388-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 01/14/2023] [Indexed: 06/17/2023]
Abstract
Two interrelated problems exist: the non-renewability of phosphate rock as a resource and the excess phosphate in the water system lead to eutrophication. Removal and recovery of phosphorus (P) from waste streams at wastewater treatment plants (WWTPs) is one of the promising solutions. This paper reviews strategies for P recovery from waste streams in WWTPs are reviewed, and the main P recovery processes were broken down into three parts: enrichment, extraction, and crystallization. On this basis, the present P recovery technology was summarized and compared. The choice of P recovery technology depends on the process of sewage treatment and sludge treatment. Most P recovery processes can meet the financial requirements since the recent surge in phosphate rock prices. The safety requirements of P recovery products add a high cost to toxic substance removal, so it is necessary to control the discharge of toxic substances such as heavy metals and persistent organic pollutants from the source.
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Affiliation(s)
- Xiang Li
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China
- ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi, 214135, People's Republic of China
| | - Shuting Shen
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China
- ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi, 214135, People's Republic of China
| | - Yuye Xu
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China
- ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi, 214135, People's Republic of China
| | - Ting Guo
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China
- ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi, 214135, People's Republic of China
| | - Hongliang Dai
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, No. 2 Mengxi Road, Zhenjiang, 212018, China
| | - Xiwu Lu
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China.
- ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi, 214135, People's Republic of China.
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Athullya MK, Dineep D, Mathew ML, Aravindakumar CT, Aravind UK. Identification of micropollutants from graywater of different complexity and remediation using multilayered membranes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:4206-4218. [PMID: 34405325 DOI: 10.1007/s11356-021-15516-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 07/15/2021] [Indexed: 06/13/2023]
Abstract
Graywater reuse is one of the important concepts in attaining water sustainability. A major challenge in this area is to realize various components present in graywater. The present study involves the identification of the chemical components of graywater collected from three different environments and to investigate the efficiency of removal of some of these chemical components using ultrafiltration membranes (polyelectrolyte multilayer (PEM) membranes). The chemical components were analyzed using liquid chromatography connected with quadrupole time-of-flight (UPLC-Q-ToF-MS). A number of micropollutants including surfactants and certain contaminants of emerging concern (CECs) were identified from these samples. Out of 16 compounds identified, 13 were surfactants and the remaining were caffeine, oxybenzone, and benzophenone. These surfactants are mostly the ingredients of various detergents. Low-pressure filtration studies of the collected samples were carried out utilizing chitosan/polyacrylic acid (CHI/PAA) multilayer membranes. A 5.5 bilayer membrane showed more than 95% rejection of the identified compounds in the selected samples and significant improvement in the water quality parameters. This demonstrates that the membrane used in this work is effective in the removal of various chemicals from graywater as well as enhancing the water quality.
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Affiliation(s)
- Manappillil K Athullya
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam, Kerala, 686560, India
| | - Devadasan Dineep
- Inter University Instrumentation Centre, Mahatma Gandhi University, Kottayam, Kerala, 686560, India
| | - Mary L Mathew
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam, Kerala, 686560, India
| | - Charuvila T Aravindakumar
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam, Kerala, 686560, India.
- Inter University Instrumentation Centre, Mahatma Gandhi University, Kottayam, Kerala, 686560, India.
| | - Usha K Aravind
- School of Environmental Studies, Cochin University of Science and Technology, Kochi, Kerala, 682022, India.
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Li X, Shen S, Xu Y, Guo T, Dai H, Lu X. Application of membrane separation processes in phosphorus recovery: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 767:144346. [PMID: 33422961 DOI: 10.1016/j.scitotenv.2020.144346] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 12/02/2020] [Accepted: 12/05/2020] [Indexed: 05/22/2023]
Abstract
The depletion of phosphorus resources and the excess discharge of phosphorus into waste streams are contrasting problems. The key to solving both problems is to recover phosphorus from the waste streams. Current phosphorus recovery technologies require high phosphorus concentrations and lack the ability to separate toxic substances from recovered phosphorus products. Membrane separation processes such as nanofiltration, forward osmosis, and electrodialysis are examples of effective methods for solving some of these issues. In this paper, the mechanisms, performance, and influential factors affect phosphorus recovery from membrane separation are reviewed. Membrane fouling, energy consumption, and the selectivity of toxic substances in membrane separation processes were evaluated. This work will serve as a basis for future research and development of phosphorus recovery by membrane separation processes and as a response to the increasingly pressing issues of eutrophication and the growing depletion of phosphorus resources.
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Affiliation(s)
- Xiang Li
- Southeast University, School Energy & Environment, 2 Sipailou Rd, Nanjing 210096, PR China; ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi 214135, PR China.
| | - Shuting Shen
- Southeast University, School Energy & Environment, 2 Sipailou Rd, Nanjing 210096, PR China; ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi 214135, PR China
| | - Yuye Xu
- Southeast University, School Energy & Environment, 2 Sipailou Rd, Nanjing 210096, PR China; ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi 214135, PR China
| | - Ting Guo
- Southeast University, School Energy & Environment, 2 Sipailou Rd, Nanjing 210096, PR China; ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi 214135, PR China
| | - Hongliang Dai
- Southeast University, School Energy & Environment, 2 Sipailou Rd, Nanjing 210096, PR China; School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, No. 2 Mengxi Road, Zhenjiang 212018, PR China.
| | - Xiwu Lu
- Southeast University, School Energy & Environment, 2 Sipailou Rd, Nanjing 210096, PR China; ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi 214135, PR China.
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Sasi S, Rayaroth MP, Aravindakumar CT, Aravind UK. Occurrence, distribution and removal of organic micro-pollutants in a low saline water body. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 749:141319. [PMID: 32822914 DOI: 10.1016/j.scitotenv.2020.141319] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 07/19/2020] [Accepted: 07/27/2020] [Indexed: 06/11/2023]
Abstract
A low saline backwater canal, mainly utilized for domestic and agricultural purposes, has been analyzed for the possible presence of organic micropollutants (OMP) and their potential removal was explored by multilayered microfiltration membranes. The qualitative as well as quantitative analysis were carried out for a span of one year using the technique of liquid chromatography connected with high resolution mass spectrometry (LC-Q-TOF-MS). The identification of the formally unknown compounds was initially done using non-target analysis based on the mass accuracy, isotopic pattern and MS/MS spectral interpretation. Results of the non target screening revealed the presence of 11 OMPs. Five of these OMPs were confirmed using standards; these include chlorophene (CHP), oxybenzone (OXY), N, N-diethyl-meta-toluamide (DEET), N, N-diethyl-benzamide (DEB) and dibutyl phthalate (DBP). Among the confirmed OMPs, the highest concentration was observed for DBP (244.61 ng l-1). The most frequently observed OMP in the study area was DBP while the least was DEB which is an insect repellent as well as a degradation product of DEET. The ecological risk associated with the target compounds has also been analyzed by calculating the risk quotient (RQ) and the results revealed that at the detected levels, these compounds are capable of causing low to medium risk. Low pressure (<0.3 bar) filtrations of the compounds were attempted using microfiltration (MF) and, poly(ethyleneimine)/poly(styrene sulfonate) (PEI/PSS) multi-layered MF membrane for spiked ultrapure water and also for natural water from the back-water canal. The batch mode illustrates nearly complete removal of CHP and OXY in spiked solutions and a good removal efficiency from natural water. The effect of coexisting ions and surfactants in feed is also illustrated. The high efficiency of the removal of both CHP and OXY, in such a complex medium highlights the potential application of the present method for the removal of similar OMPs in natural waters.
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Affiliation(s)
- Subha Sasi
- Advanced Centre of Environmental Studies and Sustainable Development, Mahatma Gandhi University, Kottayam 686560, Kerala, India
| | - Manoj P Rayaroth
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam 686560, Kerala, India
| | - Charuvila T Aravindakumar
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam 686560, Kerala, India; Inter University Instrumentation Centre, Mahatma Gandhi University, Kottayam 686560, Kerala, India
| | - Usha K Aravind
- School of Environmental Studies, Cochin University of Science and Technology, Kochi 682022, Kerala, India.
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6
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Thomas JM, Aravindakumar CT, Aravind UK. Protein loading studies using polyelectrolyte microcapsules. INT J POLYM MATER PO 2020. [DOI: 10.1080/00914037.2019.1667803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | - C. T. Aravindakumar
- Inter University Instrumentation Centre, Kottayam, India
- School of Environmental Sciences, Kottayam, India
| | - Usha K. Aravind
- Advanced Centre of Environmental Studies and Sustainable Development, Mahatma Gandhi University, Kottayam, India
- School of Environmental Studies, Cochin University of Science and Technology, Kochi, Kerala, India
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Mathew ML, Gopalakrishnan A, Aravindakumar CT, Aravind UK. Low - cost multilayered green fiber for the treatment of textile industry waste water. JOURNAL OF HAZARDOUS MATERIALS 2019; 365:297-305. [PMID: 30447637 DOI: 10.1016/j.jhazmat.2018.11.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 10/22/2018] [Accepted: 11/05/2018] [Indexed: 05/27/2023]
Abstract
Layer by layer (LbL) assembly can be regarded as an emerging technology for the separation of organic micro-pollutants from water. Direct assembly of polyelectrolytes (PEs) under LbL mode on natural support material is rare. Here we report the integration of LbL to one of the most resourceful support materials that might have an enduring impact on water treatment in color industry. A low-cost adsorbent is developed from chitosan (CHI) and polyacrylic acid (PAA) through LbL deposition on coir fiber (CF) by alternate exposure to their aqueous solutions. Their layer dependent formation is characterized by spectroscopic and microscopic techniques. CHI/PAA multilayer coated coir fiber or simply, layered coir fiber (LCF) showed high loading of cationic and anionic dyes both at acidic and alkaline loading pH. The loading was between 70% and 99% at the acidic pH 3 which is attributed to the binding between LCF and dye molecules by electrostatic and hydrophobic forces. The performance of LCF in presence of NaCl, Na2SO4 and sodium dodecyl sulfate (SDS) in dye solution is discussed. Textile industrial waste water showed significant reduction in dye (81%) content along with COD (84%) and TDS.
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Affiliation(s)
- Mary Lidiya Mathew
- Advanced Centre of Environmental Studies and Sustainable Development, Mahatma Gandhi University, P.D. Hills P.O., 686560, Kottayam, India
| | - Akhil Gopalakrishnan
- Advanced Centre of Environmental Studies and Sustainable Development, Mahatma Gandhi University, P.D. Hills P.O., 686560, Kottayam, India
| | - Charuvila T Aravindakumar
- Inter University Instrumentation Centre, Mahatma Gandhi University, P.D. Hills P.O., 686560, Kottayam, India; School of Environmental Sciences, Mahatma Gandhi University, P.D. Hills P.O., 686560, Kottayam, India
| | - Usha K Aravind
- Advanced Centre of Environmental Studies and Sustainable Development, Mahatma Gandhi University, P.D. Hills P.O., 686560, Kottayam, India; Centre for Environment Education and Technology (CEET), Kiranam, Arpookara East P.O., 686008, Kottayam, Kerala, India.
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Soyekwo F, Zhang Q, Qu Y, Lin Z, Wu X, Zhu A, Liu Q. Tetraamminezinc complex integrated interpenetrating polymer network nanocomposite membrane for phosphorous recovery. AIChE J 2018. [DOI: 10.1002/aic.16463] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Faizal Soyekwo
- Dept. of Chemical and Biochemical Engineering; College of Chemistry & Chemical Engineering, Xiamen University; Xiamen, 361005 China
| | - Qiugen Zhang
- Dept. of Chemical and Biochemical Engineering; College of Chemistry & Chemical Engineering, Xiamen University; Xiamen, 361005 China
| | - Yan Qu
- Dept. of Chemical and Biochemical Engineering; College of Chemistry & Chemical Engineering, Xiamen University; Xiamen, 361005 China
| | - Zhen Lin
- Dept. of Chemical and Biochemical Engineering; College of Chemistry & Chemical Engineering, Xiamen University; Xiamen, 361005 China
| | - Xiaodong Wu
- Dept. of Chemical and Biochemical Engineering; College of Chemistry & Chemical Engineering, Xiamen University; Xiamen, 361005 China
| | - Aimei Zhu
- Dept. of Chemical and Biochemical Engineering; College of Chemistry & Chemical Engineering, Xiamen University; Xiamen, 361005 China
| | - Qinglin Liu
- Dept. of Chemical and Biochemical Engineering; College of Chemistry & Chemical Engineering, Xiamen University; Xiamen, 361005 China
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Thomas JM, Radhakrishnan VN, Aravindakumar CT, Aravind UK. Polyelectrolyte Functional Bilayers for the Removal of Model Emerging Contaminants. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b02915] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Jain M. Thomas
- School
of Chemical Sciences, ‡Inter University Instrumentation Centre, #School of Environmental
Sciences, §Advanced Centre of Environmental Studies and Sustainable Development, Mahatma Gandhi University, P.D. Hills P.O., 686560 Kottayam, India
| | - V. N. Radhakrishnan
- School
of Chemical Sciences, ‡Inter University Instrumentation Centre, #School of Environmental
Sciences, §Advanced Centre of Environmental Studies and Sustainable Development, Mahatma Gandhi University, P.D. Hills P.O., 686560 Kottayam, India
| | - C. T. Aravindakumar
- School
of Chemical Sciences, ‡Inter University Instrumentation Centre, #School of Environmental
Sciences, §Advanced Centre of Environmental Studies and Sustainable Development, Mahatma Gandhi University, P.D. Hills P.O., 686560 Kottayam, India
| | - Usha K. Aravind
- School
of Chemical Sciences, ‡Inter University Instrumentation Centre, #School of Environmental
Sciences, §Advanced Centre of Environmental Studies and Sustainable Development, Mahatma Gandhi University, P.D. Hills P.O., 686560 Kottayam, India
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Gopalakrishnan A, Mathew ML, Chandran J, Winglee J, Badireddy AR, Wiesner M, Aravindakumar CT, Aravind UK. Sustainable polyelectrolyte multilayer surfaces: possible matrix for salt/dye separation. ACS APPLIED MATERIALS & INTERFACES 2015; 7:3699-3707. [PMID: 25650760 DOI: 10.1021/am508298d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The development of a sustainable membrane surface based on chitosan/poly(acrylic acid) (CHI/PAA) multilayers suitable for applications in analytical separations is reported here. Bilayers are constructed on polyamide microfiltration membranes at a pH combination of 3/3 (CHI pH/PAA pH) through a layer by layer approach. A 12.5 bilayer yielded a thickness of 400 nm. Low pressure (10 psi) filtrations through a 5.5 bilayered membrane exhibited high flux (7 m(3) m(-2) day(-1)) and selectivity (NaCl/reactive black 5 (RB5) selectivity >8000). The selectivity and flux observed here are the highest reported to date for low pressure filtrations through membranes. The increase in flux with increasing feed salt concentration is correlated with morphological transformations. Salt content above 7500 ppm causes some perturbation of surface layers. The presence of RB5, a model dye in the feed, restores the surface to maintain sustainability. A skin layer as thin as 50 nm imparts a large separation window. An RB5 feed concentration of 500 ppm results in 98.64% rejection with a flux of 25.79 m(3) m(-2) day(-1). The increase in flux with feed dye concentration supports the plasticizing action of RB5. The transport studies with large feed dye concentrations indicate that at a dye concentration of 500 ppm, the linear growing region (pre-exponential, 5.5 bilayer) itself provides a separation window similar to that of 100 ppm. At the same time, 1000 ppm requires a 9.5 bilayer that falls in the nonlinear growing region. Scanning electron microscopy images show the increase in porosity with respect to feed dye. Interesting morphologies that show the sustainable nature of the membrane surfaces along with the transport data of RB5 are presented.
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Affiliation(s)
- Akhil Gopalakrishnan
- Advanced Centre of Environmental Studies and Sustainable Development, ‡Inter University Instrumentation Centre, and ∇School of Environmental Sciences, Mahatma Gandhi University , P.D. Hills P.O., 686560 Kottayam, India
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11
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Phosphate pre-concentration from municipal wastewater by selectrodialysis: Effect of competing components. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2014.11.017] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Dirir YI, Hanafi Y, Ghoufi A, Szymczyk A. Theoretical investigation of the ionic selectivity of polyelectrolyte multilayer membranes in nanofiltration. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:451-7. [PMID: 25495102 DOI: 10.1021/la5044188] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Polyelectrolyte multilayer membranes have proven to be promising materials for ion nanofiltration. In this work, we implement a continuum mesoscopic transport model developed in previous works (Szymczyk, A.; Zhu, H.; Balannec, B. Langmuir 2010, 26, 1214; Szymczyk, A.; Zhu, H.; Balannec, B. J. Phys. Chem. B 2010, 114, 10143) to investigate the pressure-driven transport of electrolyte mixtures through this kind of membrane. The model accounts for an inhomogeneous distribution of the fixed charge through an arbitrary number of polyelectrolyte bilayers. We show that accounting for the multiple bipolar charge distribution resulting from the layer-by-layer assembly of polyelectrolytes with opposite charge is responsible for the increase in the Na(+)/Mg(2+) selectivity reported experimentally with respect to conventional nanofiltration membranes. The model also allows the rationalizing of the seemingly contradictory experimental results reported in the literature (i.e., the increase or decrease in the selectivity with the number of bilayers or the existence of an optimum number of bilayers). It is shown, however, that the nonmonotonous variation of the ionic selectivity does not originate from the multibipolar distribution of the fixed charge through polyelectrolyte multilayer membranes but from the existence of an optimum skin layer thickness.
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Affiliation(s)
- Yonis Ibrahim Dirir
- Institut des Sciences Chimiques de Rennes (UMR CNRS 6226) and ‡Institut de Physique de Rennes (UMR CNRS 6251), Université de Rennes 1 , 263 Avenue du Général Leclerc, 35042 Rennes, France
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Liu C, Shi L, Wang R. Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications. REACT FUNCT POLYM 2015. [DOI: 10.1016/j.reactfunctpolym.2014.07.018] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Muthumareeswaran M, Agarwal GP. Feed concentration and pH effect on arsenate and phosphate rejection via polyacrylonitrile ultrafiltration membrane. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2014.05.040] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Phuntsho S, Hong S, Elimelech M, Shon HK. Forward osmosis desalination of brackish groundwater: Meeting water quality requirements for fertigation by integrating nanofiltration. J Memb Sci 2013. [DOI: 10.1016/j.memsci.2013.02.022] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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