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Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation / Hadi Attia, Daniel Johnson, Chris J. Wright, Nidal Hilal, Christopher Wright

Desalination, Volume: 446, Pages: 70 - 82

Swansea University Authors: Daniel Johnson, Nidal Hilal, Christopher Wright

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Abstract

Membrane pore wetting is the main problem hindering long term stability of permeate flux quality in membrane distillation (MD) applications. A superhydrophobic membrane with micro and nanostructured surface features can offer a unique solution to resolve this issue. Thus, a modified electrospun memb...

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Published in: Desalination
ISSN: 0011-9164
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa43609
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A superhydrophobic membrane with micro and nanostructured surface features can offer a unique solution to resolve this issue. Thus, a modified electrospun membrane was fabricated using a combination of electrospinning and electrospraying. The membrane surface hydrophobicity was enhanced by constructing a beaded structure from spraying a mixture of non-fluorinated alumina (Al2O3) nanoparticles (NPs) mixed with low concentration of PVDF polymer on an electrospun base membrane made from PVDF. The results revealed that a rough surface with a hierarchical structure can be constructed, which could not only enhance the membrane hydrophobicity, but also further enhance the permeate efficiency by improving parameters such as flux and rejection. Additionally, the membrane hydrophobicity could be further tuned by controlling the bead spinning volume. Our study shows that the modified membrane with 7.8&#xB5;m beads layer thickness has boosted the liquid entry pressure (LEP) by 61% from 15.5 psi and the water contact angle to 154o. The performance of modified membranes with different spraying volume (1-5 ml) along with the neat electrospun and commercial membranes were examined in an air gap membrane distillation (AGMD) application for 5 hours using a 2.5 wt% of synthetic heavy metal solution as a wastewater model. Then, the optimized superhydrophobic membrane with 2 ml spinning volume (ES15-2) was further tested in comparison with the commercial membrane during long-term operations (30 h) using 3.5 wt% of mixed heavy metals. The flux was 18.67 LMH (L m&#x2212;2 h&#x2212;1) for modified membrane (ES15-2) compare with 12.62 LMH for commercial PVDF membrane during 30 h of long-term operation with feed and coolant temperature at 60oC, 20oC, respectively. The present superhydrophobic membrane fabricated by a combined electrospinning/electrospray method shows high potential for MD applications.</abstract><type>Journal Article</type><journal>Desalination</journal><volume>446</volume><paginationStart>70</paginationStart><paginationEnd>82</paginationEnd><publisher/><issnPrint>0011-9164</issnPrint><keywords>Electrospinning, Electrospray, Heavy metal treatment, Air gap membrane distillation, Superhydrophobic, Bead structure, Alumina NPs, Self-cleaning membrane.</keywords><publishedDay>15</publishedDay><publishedMonth>11</publishedMonth><publishedYear>2018</publishedYear><publishedDate>2018-11-15</publishedDate><doi>10.1016/j.desal.2018.09.001</doi><url/><notes/><college>COLLEGE NANME</college><CollegeCode>COLLEGE CODE</CollegeCode><institution>Swansea University</institution><apcterm/><lastEdited>2019-05-29T15:28:01.1337974</lastEdited><Created>2018-09-01T21:24:41.2832830</Created><path><level id="1">College of Engineering</level><level id="2">Engineering</level></path><authors><author><firstname>Hadi</firstname><surname>Attia</surname><order>1</order></author><author><firstname>Daniel</firstname><surname>Johnson</surname><orcid>0000-0001-6921-0389</orcid><order>2</order></author><author><firstname>Chris J.</firstname><surname>Wright</surname><order>3</order></author><author><firstname>Nidal</firstname><surname>Hilal</surname><order>4</order></author><author><firstname>Christopher</firstname><surname>Wright</surname><orcid>0000-0003-2375-8159</orcid><order>5</order></author></authors><documents><document><filename>0043609-01092018212820.pdf</filename><originalFilename>Revisedv3.pdf</originalFilename><uploaded>2018-09-01T21:28:20.6670000</uploaded><type>Output</type><contentLength>2169976</contentLength><contentType>application/pdf</contentType><version>Accepted Manuscript</version><cronfaStatus>true</cronfaStatus><embargoDate>2019-09-08T00:00:00.0000000</embargoDate><documentNotes>Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND).</documentNotes><copyrightCorrect>true</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807>
spelling 2019-05-29T15:28:01.1337974 v2 43609 2018-09-01 Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation 4bdcc306062428d2715b0dd308cc092f 0000-0001-6921-0389 Daniel Johnson Daniel Johnson true false 3acba771241d878c8e35ff464aec0342 Nidal Hilal Nidal Hilal true false 235e125ac3463e2ee7fc98604bf879ce 0000-0003-2375-8159 Christopher Wright Christopher Wright true false 2018-09-01 Membrane pore wetting is the main problem hindering long term stability of permeate flux quality in membrane distillation (MD) applications. A superhydrophobic membrane with micro and nanostructured surface features can offer a unique solution to resolve this issue. Thus, a modified electrospun membrane was fabricated using a combination of electrospinning and electrospraying. The membrane surface hydrophobicity was enhanced by constructing a beaded structure from spraying a mixture of non-fluorinated alumina (Al2O3) nanoparticles (NPs) mixed with low concentration of PVDF polymer on an electrospun base membrane made from PVDF. The results revealed that a rough surface with a hierarchical structure can be constructed, which could not only enhance the membrane hydrophobicity, but also further enhance the permeate efficiency by improving parameters such as flux and rejection. Additionally, the membrane hydrophobicity could be further tuned by controlling the bead spinning volume. Our study shows that the modified membrane with 7.8µm beads layer thickness has boosted the liquid entry pressure (LEP) by 61% from 15.5 psi and the water contact angle to 154o. The performance of modified membranes with different spraying volume (1-5 ml) along with the neat electrospun and commercial membranes were examined in an air gap membrane distillation (AGMD) application for 5 hours using a 2.5 wt% of synthetic heavy metal solution as a wastewater model. Then, the optimized superhydrophobic membrane with 2 ml spinning volume (ES15-2) was further tested in comparison with the commercial membrane during long-term operations (30 h) using 3.5 wt% of mixed heavy metals. The flux was 18.67 LMH (L m−2 h−1) for modified membrane (ES15-2) compare with 12.62 LMH for commercial PVDF membrane during 30 h of long-term operation with feed and coolant temperature at 60oC, 20oC, respectively. The present superhydrophobic membrane fabricated by a combined electrospinning/electrospray method shows high potential for MD applications. Journal Article Desalination 446 70 82 0011-9164 Electrospinning, Electrospray, Heavy metal treatment, Air gap membrane distillation, Superhydrophobic, Bead structure, Alumina NPs, Self-cleaning membrane. 15 11 2018 2018-11-15 10.1016/j.desal.2018.09.001 COLLEGE NANME COLLEGE CODE Swansea University 2019-05-29T15:28:01.1337974 2018-09-01T21:24:41.2832830 College of Engineering Engineering Hadi Attia 1 Daniel Johnson 0000-0001-6921-0389 2 Chris J. Wright 3 Nidal Hilal 4 Christopher Wright 0000-0003-2375-8159 5 0043609-01092018212820.pdf Revisedv3.pdf 2018-09-01T21:28:20.6670000 Output 2169976 application/pdf Accepted Manuscript true 2019-09-08T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng
title Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation
spellingShingle Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation
Daniel, Johnson
Nidal, Hilal
Christopher, Wright
title_short Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation
title_full Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation
title_fullStr Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation
title_full_unstemmed Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation
title_sort Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation
author_id_str_mv 4bdcc306062428d2715b0dd308cc092f
3acba771241d878c8e35ff464aec0342
235e125ac3463e2ee7fc98604bf879ce
author_id_fullname_str_mv 4bdcc306062428d2715b0dd308cc092f_***_Daniel, Johnson
3acba771241d878c8e35ff464aec0342_***_Nidal, Hilal
235e125ac3463e2ee7fc98604bf879ce_***_Christopher, Wright
author Daniel, Johnson
Nidal, Hilal
Christopher, Wright
author2 Hadi Attia
Daniel Johnson
Chris J. Wright
Nidal Hilal
Christopher Wright
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publishDate 2018
institution Swansea University
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hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
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description Membrane pore wetting is the main problem hindering long term stability of permeate flux quality in membrane distillation (MD) applications. A superhydrophobic membrane with micro and nanostructured surface features can offer a unique solution to resolve this issue. Thus, a modified electrospun membrane was fabricated using a combination of electrospinning and electrospraying. The membrane surface hydrophobicity was enhanced by constructing a beaded structure from spraying a mixture of non-fluorinated alumina (Al2O3) nanoparticles (NPs) mixed with low concentration of PVDF polymer on an electrospun base membrane made from PVDF. The results revealed that a rough surface with a hierarchical structure can be constructed, which could not only enhance the membrane hydrophobicity, but also further enhance the permeate efficiency by improving parameters such as flux and rejection. Additionally, the membrane hydrophobicity could be further tuned by controlling the bead spinning volume. Our study shows that the modified membrane with 7.8µm beads layer thickness has boosted the liquid entry pressure (LEP) by 61% from 15.5 psi and the water contact angle to 154o. The performance of modified membranes with different spraying volume (1-5 ml) along with the neat electrospun and commercial membranes were examined in an air gap membrane distillation (AGMD) application for 5 hours using a 2.5 wt% of synthetic heavy metal solution as a wastewater model. Then, the optimized superhydrophobic membrane with 2 ml spinning volume (ES15-2) was further tested in comparison with the commercial membrane during long-term operations (30 h) using 3.5 wt% of mixed heavy metals. The flux was 18.67 LMH (L m−2 h−1) for modified membrane (ES15-2) compare with 12.62 LMH for commercial PVDF membrane during 30 h of long-term operation with feed and coolant temperature at 60oC, 20oC, respectively. The present superhydrophobic membrane fabricated by a combined electrospinning/electrospray method shows high potential for MD applications.
published_date 2018-11-15T04:04:28Z
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score 10.832179