Recovery of Cr(III) from tannery effluents by diafiltration using chitosan modified membranes
Autor(a) principal: | |
---|---|
Data de Publicação: | 2021 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10362/142773 |
Resumo: | The selective recovery of chromium remaining in tannery effluents after the leather tan-ning process is highly desirable to potentiate its reuse, simultaneously minimizing the ecotoxicity of these effluents. To the best of our knowledge, this work evaluates for the first time the ability of a chitosan-based membrane for selective recovery of chromium from a tannery wastewater by sub-sequent diafiltration and selective chromium desorption, envisaging their integration after tannery wastewater treatment by reverse osmosis (RO). A polyethersulfone (PES) microfiltration membrane top-coated with a chitosan layer (cs-PES MF022) was used for selective recovery of Cr(III), from concentrate streams obtained by treatment of synthetic and real tannery effluents through reverse osmosis (RO), through a diafiltration process. The diafiltration of the RO concentrates was conducted by an intermittent addition of water acidified to pH 3.6. The prepared cs-PES MF022 membranes were able to retain 97% of the total mass of Cr(III) present in the RO concentrates, from a real tannery effluent, with a selectivity of 4.2 and 5 in reference to NH4+ and Cl−, respectively, 12.9 and 14.6 in reference to K and Na, and > 45 in reference to Mg, Ca, and S. Such a high selectivity is explained by the preferential adsorption of Cr(III) onto chitosan, and by the relatively high perme-ability of cs-PES MF022 membranes to the other ionic species. Proof of concept studies were per-formed to investigate the desorption of Cr(III) at pH 2 and 5.8. A higher Cr(III) desorption degree was obtained at pH 2, leading to a final solution enriched in Cr(III), which may be re-used in tannery operations, thus improving the process economy and reducing the hazardous impact of the effluents discharged by this industry. |
id |
RCAP_5301a02ac650d4fbff0dbba52e6cccf5 |
---|---|
oai_identifier_str |
oai:run.unl.pt:10362/142773 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Recovery of Cr(III) from tannery effluents by diafiltration using chitosan modified membranesChitosan membraneChromium recoveryDiafiltrationSelective ad-sorptionSelective desorptionTannery effluentGeography, Planning and DevelopmentBiochemistryAquatic ScienceWater Science and TechnologyThe selective recovery of chromium remaining in tannery effluents after the leather tan-ning process is highly desirable to potentiate its reuse, simultaneously minimizing the ecotoxicity of these effluents. To the best of our knowledge, this work evaluates for the first time the ability of a chitosan-based membrane for selective recovery of chromium from a tannery wastewater by sub-sequent diafiltration and selective chromium desorption, envisaging their integration after tannery wastewater treatment by reverse osmosis (RO). A polyethersulfone (PES) microfiltration membrane top-coated with a chitosan layer (cs-PES MF022) was used for selective recovery of Cr(III), from concentrate streams obtained by treatment of synthetic and real tannery effluents through reverse osmosis (RO), through a diafiltration process. The diafiltration of the RO concentrates was conducted by an intermittent addition of water acidified to pH 3.6. The prepared cs-PES MF022 membranes were able to retain 97% of the total mass of Cr(III) present in the RO concentrates, from a real tannery effluent, with a selectivity of 4.2 and 5 in reference to NH4+ and Cl−, respectively, 12.9 and 14.6 in reference to K and Na, and > 45 in reference to Mg, Ca, and S. Such a high selectivity is explained by the preferential adsorption of Cr(III) onto chitosan, and by the relatively high perme-ability of cs-PES MF022 membranes to the other ionic species. Proof of concept studies were per-formed to investigate the desorption of Cr(III) at pH 2 and 5.8. A higher Cr(III) desorption degree was obtained at pH 2, leading to a final solution enriched in Cr(III), which may be re-used in tannery operations, thus improving the process economy and reducing the hazardous impact of the effluents discharged by this industry.DQ - Departamento de QuímicaLAQV@REQUIMTERUNZakmout, AsmaaSadi, FatmaVelizarov, SvetlozarCrespo, João G.Portugal, Carla A. M.2022-08-01T22:26:08Z2021-09-212021-09-21T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10362/142773eng2073-4441PURE: 45750372https://doi.org/10.3390/w13182598info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T05:20:41Zoai:run.unl.pt:10362/142773Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:50:30.783818Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Recovery of Cr(III) from tannery effluents by diafiltration using chitosan modified membranes |
title |
Recovery of Cr(III) from tannery effluents by diafiltration using chitosan modified membranes |
spellingShingle |
Recovery of Cr(III) from tannery effluents by diafiltration using chitosan modified membranes Zakmout, Asmaa Chitosan membrane Chromium recovery Diafiltration Selective ad-sorption Selective desorption Tannery effluent Geography, Planning and Development Biochemistry Aquatic Science Water Science and Technology |
title_short |
Recovery of Cr(III) from tannery effluents by diafiltration using chitosan modified membranes |
title_full |
Recovery of Cr(III) from tannery effluents by diafiltration using chitosan modified membranes |
title_fullStr |
Recovery of Cr(III) from tannery effluents by diafiltration using chitosan modified membranes |
title_full_unstemmed |
Recovery of Cr(III) from tannery effluents by diafiltration using chitosan modified membranes |
title_sort |
Recovery of Cr(III) from tannery effluents by diafiltration using chitosan modified membranes |
author |
Zakmout, Asmaa |
author_facet |
Zakmout, Asmaa Sadi, Fatma Velizarov, Svetlozar Crespo, João G. Portugal, Carla A. M. |
author_role |
author |
author2 |
Sadi, Fatma Velizarov, Svetlozar Crespo, João G. Portugal, Carla A. M. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
DQ - Departamento de Química LAQV@REQUIMTE RUN |
dc.contributor.author.fl_str_mv |
Zakmout, Asmaa Sadi, Fatma Velizarov, Svetlozar Crespo, João G. Portugal, Carla A. M. |
dc.subject.por.fl_str_mv |
Chitosan membrane Chromium recovery Diafiltration Selective ad-sorption Selective desorption Tannery effluent Geography, Planning and Development Biochemistry Aquatic Science Water Science and Technology |
topic |
Chitosan membrane Chromium recovery Diafiltration Selective ad-sorption Selective desorption Tannery effluent Geography, Planning and Development Biochemistry Aquatic Science Water Science and Technology |
description |
The selective recovery of chromium remaining in tannery effluents after the leather tan-ning process is highly desirable to potentiate its reuse, simultaneously minimizing the ecotoxicity of these effluents. To the best of our knowledge, this work evaluates for the first time the ability of a chitosan-based membrane for selective recovery of chromium from a tannery wastewater by sub-sequent diafiltration and selective chromium desorption, envisaging their integration after tannery wastewater treatment by reverse osmosis (RO). A polyethersulfone (PES) microfiltration membrane top-coated with a chitosan layer (cs-PES MF022) was used for selective recovery of Cr(III), from concentrate streams obtained by treatment of synthetic and real tannery effluents through reverse osmosis (RO), through a diafiltration process. The diafiltration of the RO concentrates was conducted by an intermittent addition of water acidified to pH 3.6. The prepared cs-PES MF022 membranes were able to retain 97% of the total mass of Cr(III) present in the RO concentrates, from a real tannery effluent, with a selectivity of 4.2 and 5 in reference to NH4+ and Cl−, respectively, 12.9 and 14.6 in reference to K and Na, and > 45 in reference to Mg, Ca, and S. Such a high selectivity is explained by the preferential adsorption of Cr(III) onto chitosan, and by the relatively high perme-ability of cs-PES MF022 membranes to the other ionic species. Proof of concept studies were per-formed to investigate the desorption of Cr(III) at pH 2 and 5.8. A higher Cr(III) desorption degree was obtained at pH 2, leading to a final solution enriched in Cr(III), which may be re-used in tannery operations, thus improving the process economy and reducing the hazardous impact of the effluents discharged by this industry. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-09-21 2021-09-21T00:00:00Z 2022-08-01T22:26:08Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10362/142773 |
url |
http://hdl.handle.net/10362/142773 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
2073-4441 PURE: 45750372 https://doi.org/10.3390/w13182598 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
_version_ |
1799138101906374656 |