Publication
Sustainable adsorbents formed from by-product of acid activation of vermiculite and leached-vermiculite-LDH hybrids for removal of industrial dyes and metal cations
| dc.contributor.author | Stawiński, Wojciech | |
| dc.contributor.author | Węgrzyn, Agnieszka | |
| dc.contributor.author | Mordarski, Grzegorz | |
| dc.contributor.author | Skiba, Michał | |
| dc.contributor.author | Freitas, Olga | |
| dc.contributor.author | Figueiredo, Sónia | |
| dc.date.accessioned | 2019-09-13T09:54:37Z | |
| dc.date.available | 2019-09-13T09:54:37Z | |
| dc.date.issued | 2018 | |
| dc.description.abstract | Hydrotalcite-like layered double hydroxide (LDH) materials were synthesized from liquid waste by-product produced during acid activation of vermiculite (raw (W) and expanded (Ve)), and by combining the waste with the activated mineral, novel hybrid vermiculite-hydrotalcite-like materials were obtained in one-pot synthesis. Batch system adsorption experiments were performed on fresh and calcined (at 450 °C) materials using two anionic dyes (Congo Red - CR, and Reactive Red 184 - R), a cationic dye (Astrazon Red - AR), and Cu2+. Calcination significantly increased the materials' adsorption capacities for all the pollutants. The highest adsorption capacities of the LDH derived from W were 289 ± 2, 137 ± 2, 38.2 ± 0.6 and 64 ± 2 mg g−1, while for the ones derived from Ve were 214 ± 2, 119.5 ± 0.3, 35.9 ± 0.7 and 66 ± 3 mg g−1 for CR, R, AR and Cu2+, respectively. The hybrids obtained from W attained removal levels of 238 ± 3, 111 ± 2, 44 ± 1 and 70 ± 1 mg g−1 and their counterparts derived from Ve reached 84 ± 1, 34.1 ± 0.5, 43 ± 2 and 75 ± 1 mg g−1 for CR, R, AR and Cu2+, respectively. Strong synergic effect on adsorption was observed in the hybrid materials, especially in these derived from Ve. These adsorbents had higher (up to 400%) adsorption capacities than theoretical ones prepared by mixing ex-situ appropriate amounts of activated vermiculite and LDH. All the materials were characterized by XRD, SEM-EDS, and ATR techniques. The proposed procedure is a sustainable approach to clay minerals valorization and my open new possibilities in fields such as wastewater treatment or catalysis. | pt_PT |
| dc.description.sponsorship | This work, within the scope of the project of Labóratorio Associado para Química Verde – Technologia e Processos Limpos – UID/QUI/50006, is financed by national founds of FCT/MEC and co-financed by Fundos FEDER (POCI-01-0145-FEDER-007265) within the scope of the partnership agreement PT2020. Part of the research was carried out with the equipment purchased thanks to the financial support of the European Regional Development Fund in the framework of the Polish Innovation Economy Operational Program (contract no. POIG.02.01.00-12-023/08). To all financing sources the authors are greatly indebted. | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.doi | 10.1016/j.clay.2018.04.007 | |
| dc.identifier.issn | 0169-1317 | |
| dc.identifier.uri | http://hdl.handle.net/10400.22/14599 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | yes | pt_PT |
| dc.publisher | Elsevier | pt_PT |
| dc.relation.publisherversion | https://www.sciencedirect.com/science/article/pii/S0169131718301571?via%3Dihub | pt_PT |
| dc.subject | Adsorption | pt_PT |
| dc.subject | Modified clays | pt_PT |
| dc.subject | Vermiculite | pt_PT |
| dc.subject | Hydrotalcite | pt_PT |
| dc.subject | Hybrid adsorbents | pt_PT |
| dc.title | Sustainable adsorbents formed from by-product of acid activation of vermiculite and leached-vermiculite-LDH hybrids for removal of industrial dyes and metal cations | pt_PT |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/5876/UID%2FQUI%2F50006%2F2013/PT | |
| oaire.citation.endPage | 14 | pt_PT |
| oaire.citation.startPage | 6 | pt_PT |
| oaire.citation.title | Applied Clay Science | pt_PT |
| oaire.citation.volume | 161 | pt_PT |
| oaire.fundingStream | 5876 | |
| person.familyName | Stawiński | |
| person.familyName | Freitas | |
| person.familyName | Figueiredo | |
| person.givenName | Wojciech | |
| person.givenName | Olga | |
| person.givenName | Sónia | |
| person.identifier | 1104854 | |
| person.identifier.ciencia-id | 6915-A6F2-F8A1 | |
| person.identifier.orcid | 0000-0002-1421-0741 | |
| person.identifier.orcid | 0000-0002-2499-6143 | |
| person.identifier.orcid | 0000-0001-8548-2528 | |
| person.identifier.rid | D-8307-2013 | |
| person.identifier.rid | D-8292-2013 | |
| person.identifier.scopus-author-id | 56007271500 | |
| person.identifier.scopus-author-id | 18634256400 | |
| person.identifier.scopus-author-id | 7004125737 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | article | pt_PT |
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