Publicação
Valorization of coffee husk into carbonaceous materials for adsorption of nitrophenols
| Resumo: | With the exponential increase of the world population over the years, the organic waste generated from coffee also increased, since it is one of the most consumed commodities of world. Nowadays, many research studies aim to reduce or avoid environmental impacts. One way is the valorization of solid waste into high-added value products, as is the case of the preparation of activated carbons from raw biomass. Due to their well-developed porosity, activated carbons can be used to remove pollutants contained in wastewater effluents through adsorption processes. The main objective of this work is the development of activated carbons from coffee husks, considering HNO3 and KOH as activation agents, and their assessment in the removal of 2-nitrophenol and 4-nitrophenol, selected as target pollutants. The activating agents were used at different concentrations (1 and 5 mol L-1) and the precursor was activated for 3 hours at 60 °C. Then, the resultant materials were carbonized by pyrolysis at 800 °C under continuous flow of N2. The activated carbons were used to adsorb 2-nitrophenol and 4-nitrophenol at 25 °C and pH 6.0. Upon analysis of the adsorption isotherms obtained, it was possible to conclude that the activated carbon that leads to a high percentage of pollutant removal was the one activated with KOH 5 mol L-1, considering an initial concentration of 25 mg L-1 of 2-nitrophenol and 50 mg L-1 of 4-nitrophenol with a concentration of adsorbent of 2.5 gads L-1. This activated carbon, prepared with a low burn-off, had 92.9% (9.7 mg2-NP gads-1) of removal of 2-nitrophenol and 97.7% (22.5 mg4-NP gads-1) of removal of 4-nitrophenol. It had 84.1% of burn-off in its development process. Due to the superior results of this material, the kinetic analysis was done using only the activated carbon activated with KOH 5 mol L-1. The kinetic results show that the material reached its maximum adsorption after 4 h adsorbing around 85% of both pollutants. The modelling of the kinetic results was also done. The best model to predict in a representative way the adsorption isotherm was the Freundlich model for both pollutants. For the adsorption kinetic model, the best fittings were obtained with the Bangham model for 2-nitrophenol adsorption and with the pseudo-second-order model for 4-nitrophenol adsorption. |
|---|---|
| Autores principais: | Guides, George Leme |
| Assunto: | Activated carbons Adsorption Nitrophenols Coffee Valorization Wastewater treatment |
| Ano: | 2021 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| _version_ | 1863850727987740672 |
|---|---|
| author | Guides, George Leme |
| author_facet | Guides, George Leme |
| author_role | author |
| contributor_name_str_mv | Gomes, Helder Marin, Pricila Díaz de Tuesta, Jose Luis Biblioteca Digital do IPB |
| country_str | PT |
| creators_json_str | [{\"Person.name\":\"Guides, George Leme\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Gomes, Helder Marin, Pricila Díaz de Tuesta, Jose Luis Biblioteca Digital do IPB |
| datacite.creators.creator.creatorName.fl_str_mv | Guides, George Leme |
| datacite.date.Accepted.fl_str_mv | 2021-01-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2021-10-13T11:11:36Z |
| datacite.date.embargoed.fl_str_mv | 2021-10-13T11:11:36Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_16ec |
| datacite.subjects.subject.fl_str_mv | Activated carbons Adsorption Nitrophenols Coffee Valorization Wastewater treatment |
| datacite.titles.title.fl_str_mv | Valorization of coffee husk into carbonaceous materials for adsorption of nitrophenols |
| dc.contributor.none.fl_str_mv | Gomes, Helder Marin, Pricila Díaz de Tuesta, Jose Luis Biblioteca Digital do IPB |
| dc.creator.none.fl_str_mv | Guides, George Leme |
| dc.date.Accepted.fl_str_mv | 2021-01-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2021-10-13T11:11:36Z |
| dc.date.embargoed.fl_str_mv | 2021-10-13T11:11:36Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10198/24006 |
| dc.language.none.fl_str_mv | eng |
| dc.rights.cclincense.fl_str_mv | http://creativecommons.org/licenses/by-nc/4.0/ |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_16ec |
| dc.subject.none.fl_str_mv | Activated carbons Adsorption Nitrophenols Coffee Valorization Wastewater treatment |
| dc.title.fl_str_mv | Valorization of coffee husk into carbonaceous materials for adsorption of nitrophenols |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_bdcc |
| description | With the exponential increase of the world population over the years, the organic waste generated from coffee also increased, since it is one of the most consumed commodities of world. Nowadays, many research studies aim to reduce or avoid environmental impacts. One way is the valorization of solid waste into high-added value products, as is the case of the preparation of activated carbons from raw biomass. Due to their well-developed porosity, activated carbons can be used to remove pollutants contained in wastewater effluents through adsorption processes. The main objective of this work is the development of activated carbons from coffee husks, considering HNO3 and KOH as activation agents, and their assessment in the removal of 2-nitrophenol and 4-nitrophenol, selected as target pollutants. The activating agents were used at different concentrations (1 and 5 mol L-1) and the precursor was activated for 3 hours at 60 °C. Then, the resultant materials were carbonized by pyrolysis at 800 °C under continuous flow of N2. The activated carbons were used to adsorb 2-nitrophenol and 4-nitrophenol at 25 °C and pH 6.0. Upon analysis of the adsorption isotherms obtained, it was possible to conclude that the activated carbon that leads to a high percentage of pollutant removal was the one activated with KOH 5 mol L-1, considering an initial concentration of 25 mg L-1 of 2-nitrophenol and 50 mg L-1 of 4-nitrophenol with a concentration of adsorbent of 2.5 gads L-1. This activated carbon, prepared with a low burn-off, had 92.9% (9.7 mg2-NP gads-1) of removal of 2-nitrophenol and 97.7% (22.5 mg4-NP gads-1) of removal of 4-nitrophenol. It had 84.1% of burn-off in its development process. Due to the superior results of this material, the kinetic analysis was done using only the activated carbon activated with KOH 5 mol L-1. The kinetic results show that the material reached its maximum adsorption after 4 h adsorbing around 85% of both pollutants. The modelling of the kinetic results was also done. The best model to predict in a representative way the adsorption isotherm was the Freundlich model for both pollutants. For the adsorption kinetic model, the best fittings were obtained with the Bangham model for 2-nitrophenol adsorption and with the pseudo-second-order model for 4-nitrophenol adsorption. |
| dirty | 0 |
| eu_rights_str_mv | restrictedAccess |
| format | masterThesis |
| fulltext.url.fl_str_mv | https://bibliotecadigital.ipb.pt/bitstreams/d7d69530-33fc-41ef-85e6-ca292f27616b/download |
| id | ipb_7e66beecc7e5174ec9f2c00a4a51928e |
| identifier.url.fl_str_mv | http://hdl.handle.net/10198/24006 |
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| institution | Instituto Politécnico de Bragança |
| instname_str | Instituto Politécnico de Bragança |
| language | eng |
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| oai_identifier_str | oai:bibliotecadigital.ipb.pt:10198/24006 |
| organization_str_mv | urn:organizationAcronym:ipb |
| person_str_mv | Guides, George Leme |
| publishDate | 2021 |
| reponame_str | Biblioteca Digital do IPB |
| repository_id_str | urn:repositoryAcronym:ipb |
| service_str_mv | urn:repositoryAcronym:ipb |
| spelling | engpt_PTWith the exponential increase of the world population over the years, the organic waste generated from coffee also increased, since it is one of the most consumed commodities of world. Nowadays, many research studies aim to reduce or avoid environmental impacts. One way is the valorization of solid waste into high-added value products, as is the case of the preparation of activated carbons from raw biomass. Due to their well-developed porosity, activated carbons can be used to remove pollutants contained in wastewater effluents through adsorption processes. The main objective of this work is the development of activated carbons from coffee husks, considering HNO3 and KOH as activation agents, and their assessment in the removal of 2-nitrophenol and 4-nitrophenol, selected as target pollutants. The activating agents were used at different concentrations (1 and 5 mol L-1) and the precursor was activated for 3 hours at 60 °C. Then, the resultant materials were carbonized by pyrolysis at 800 °C under continuous flow of N2. The activated carbons were used to adsorb 2-nitrophenol and 4-nitrophenol at 25 °C and pH 6.0. Upon analysis of the adsorption isotherms obtained, it was possible to conclude that the activated carbon that leads to a high percentage of pollutant removal was the one activated with KOH 5 mol L-1, considering an initial concentration of 25 mg L-1 of 2-nitrophenol and 50 mg L-1 of 4-nitrophenol with a concentration of adsorbent of 2.5 gads L-1. This activated carbon, prepared with a low burn-off, had 92.9% (9.7 mg2-NP gads-1) of removal of 2-nitrophenol and 97.7% (22.5 mg4-NP gads-1) of removal of 4-nitrophenol. It had 84.1% of burn-off in its development process. Due to the superior results of this material, the kinetic analysis was done using only the activated carbon activated with KOH 5 mol L-1. The kinetic results show that the material reached its maximum adsorption after 4 h adsorbing around 85% of both pollutants. The modelling of the kinetic results was also done. The best model to predict in a representative way the adsorption isotherm was the Freundlich model for both pollutants. For the adsorption kinetic model, the best fittings were obtained with the Bangham model for 2-nitrophenol adsorption and with the pseudo-second-order model for 4-nitrophenol adsorption.application/pdfpt_PTValorization of coffee husk into carbonaceous materials for adsorption of nitrophenolsGuides, George LemeGomes, HelderMarin, PricilaDíaz de Tuesta, Jose LuisHostingInstitutionOrganizationalBiblioteca Digital do IPBe-mailmailto:dspace@ipb.ptdspace@ipb.ptURNurn:tid:2027740232021-10-13T11:11:36Z20212021-01-01T00:00:00ZHandlehttp://hdl.handle.net/10198/24006http://purl.org/coar/access_right/c_16ecrestricted accessActivated carbonsAdsorptionNitrophenolsCoffeeValorizationWastewater treatment1771791 bytesliteraturehttp://purl.org/coar/resource_type/c_bdccmaster thesis2021http://creativecommons.org/licenses/by-nc/4.0/http://purl.org/coar/access_right/c_16ecapplication/pdffulltexthttps://bibliotecadigital.ipb.pt/bitstreams/d7d69530-33fc-41ef-85e6-ca292f27616b/download |
| spellingShingle | Valorization of coffee husk into carbonaceous materials for adsorption of nitrophenols Guides, George Leme Activated carbons Adsorption Nitrophenols Coffee Valorization Wastewater treatment |
| subject.fl_str_mv | Activated carbons Adsorption Nitrophenols Coffee Valorization Wastewater treatment |
| title | Valorization of coffee husk into carbonaceous materials for adsorption of nitrophenols |
| title_full | Valorization of coffee husk into carbonaceous materials for adsorption of nitrophenols |
| title_fullStr | Valorization of coffee husk into carbonaceous materials for adsorption of nitrophenols |
| title_full_unstemmed | Valorization of coffee husk into carbonaceous materials for adsorption of nitrophenols |
| title_short | Valorization of coffee husk into carbonaceous materials for adsorption of nitrophenols |
| title_sort | Valorization of coffee husk into carbonaceous materials for adsorption of nitrophenols |
| topic | Activated carbons Adsorption Nitrophenols Coffee Valorization Wastewater treatment |
| topic_facet | Activated carbons Adsorption Nitrophenols Coffee Valorization Wastewater treatment |
| url | http://hdl.handle.net/10198/24006 |
| visible | 1 |