Adding value to gasification and co-pyrolysis chars as removal agents of Cr 3+

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The present work aims to assess the efficiency of chars, obtained from the gasification and co-pyrolysis of rice wastes, as adsorbents of Cr 3+ from aqueous solution. GC and PC chars, produced in the gasification and co-pyrolysis, respectively, of rice husk and polyethylene were studied. Cr 3+ removal assays were optimised for the initial pH value, adsorbent mass, contact time and Cr 3+ initial concentration. GC showed a better performance than PC with about 100% Cr 3+ removal, due to the pH increase that caused Cr precipitation. Under pH conditions in which the adsorption prevailed (pH < 5.5), GC presented the highest uptake capacity (21.1 mg Cr 3+ g −1 char) for the following initial conditions: 50 mg Cr 3+ L −1 ; pH 5; contact time: 24 h; L/S ratio: 1000 mL g −1 . The pseudo-second order kinetic model showed the best adjustment to GC experimental data. Both the first and second order kinetic models fitted well to PC experimental data. The ion exchange was the dominant phenomenon on the Cr 3+ adsorption by GC sample. Also, this char significantly reduced the ecotoxicity of Cr 3+ solutions for the bacterium Vibrio fischeri. GC char proved to be an efficient material to remove Cr 3+ from aqueous solution, without the need for further activation.

Original languageEnglish
Pages (from-to)173-182
Number of pages10
JournalJournal of Hazardous Materials
Volume321
DOIs
Publication statusPublished - 5 Jan 2017

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Trout
Gasification
pyrolysis
Pyrolysis
rice
aqueous solution
adsorption
kinetics
Adsorbents
Adsorption
ion exchange
Kinetics
assay
Polyethylene
bacterium
Aliivibrio fischeri
Polyethylenes
Assays
Ion exchange
Bacteria

Keywords

  • Chars
  • Co-pyrolysis
  • Cr removal
  • Gasification
  • Rice wastes

Cite this

@article{90ba0524cab94c2cbaa95e313c34fadc,
title = "Adding value to gasification and co-pyrolysis chars as removal agents of Cr 3+",
abstract = "The present work aims to assess the efficiency of chars, obtained from the gasification and co-pyrolysis of rice wastes, as adsorbents of Cr 3+ from aqueous solution. GC and PC chars, produced in the gasification and co-pyrolysis, respectively, of rice husk and polyethylene were studied. Cr 3+ removal assays were optimised for the initial pH value, adsorbent mass, contact time and Cr 3+ initial concentration. GC showed a better performance than PC with about 100{\%} Cr 3+ removal, due to the pH increase that caused Cr precipitation. Under pH conditions in which the adsorption prevailed (pH < 5.5), GC presented the highest uptake capacity (21.1 mg Cr 3+ g −1 char) for the following initial conditions: 50 mg Cr 3+ L −1 ; pH 5; contact time: 24 h; L/S ratio: 1000 mL g −1 . The pseudo-second order kinetic model showed the best adjustment to GC experimental data. Both the first and second order kinetic models fitted well to PC experimental data. The ion exchange was the dominant phenomenon on the Cr 3+ adsorption by GC sample. Also, this char significantly reduced the ecotoxicity of Cr 3+ solutions for the bacterium Vibrio fischeri. GC char proved to be an efficient material to remove Cr 3+ from aqueous solution, without the need for further activation.",
keywords = "Chars, Co-pyrolysis, Cr removal, Gasification, Rice wastes",
author = "D. Godinho and D. Dias and M. Bernardo and N. Lapa and I. Fonseca and H. Lopes and F. Pinto",
note = "This research was funded by FEDER through the Operational Program for Competitive Factors of COMPETE and by National Funds through FCT (Foundation for Science and Technology) through the project PTDC/AAG-REC/3477/2012-RICEVALOR {"}Energetic valorisation of wastes obtained during rice production in Portugal{"}, FCOMP-01-0124-FEDER-027827, a project sponsored by FCT/MTCES, QREN, COMPETE and FEDER. The authors also acknowledge FCT (Foundation for Science and Technology) for funding Maria Bernardo's post-doc fellowship (SFRH/BPD/93407/2013), Diogo Dias's PhD fellowship (SFRH/BD/101751/2014) and LAQV/REQUIMTE through national funds (UID/QUI/50006/2013) and co-funds by the ERDF under the PT2020 Partnership Agreement (POCI-01-0145-FEDER-007265).",
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language = "English",
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Adding value to gasification and co-pyrolysis chars as removal agents of Cr 3+. / Godinho, D.; Dias, D.; Bernardo, M.; Lapa, N.; Fonseca, I.; Lopes, H.; Pinto, F.

In: Journal of Hazardous Materials, Vol. 321, 05.01.2017, p. 173-182.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Adding value to gasification and co-pyrolysis chars as removal agents of Cr 3+

AU - Godinho, D.

AU - Dias, D.

AU - Bernardo, M.

AU - Lapa, N.

AU - Fonseca, I.

AU - Lopes, H.

AU - Pinto, F.

N1 - This research was funded by FEDER through the Operational Program for Competitive Factors of COMPETE and by National Funds through FCT (Foundation for Science and Technology) through the project PTDC/AAG-REC/3477/2012-RICEVALOR "Energetic valorisation of wastes obtained during rice production in Portugal", FCOMP-01-0124-FEDER-027827, a project sponsored by FCT/MTCES, QREN, COMPETE and FEDER. The authors also acknowledge FCT (Foundation for Science and Technology) for funding Maria Bernardo's post-doc fellowship (SFRH/BPD/93407/2013), Diogo Dias's PhD fellowship (SFRH/BD/101751/2014) and LAQV/REQUIMTE through national funds (UID/QUI/50006/2013) and co-funds by the ERDF under the PT2020 Partnership Agreement (POCI-01-0145-FEDER-007265).

PY - 2017/1/5

Y1 - 2017/1/5

N2 - The present work aims to assess the efficiency of chars, obtained from the gasification and co-pyrolysis of rice wastes, as adsorbents of Cr 3+ from aqueous solution. GC and PC chars, produced in the gasification and co-pyrolysis, respectively, of rice husk and polyethylene were studied. Cr 3+ removal assays were optimised for the initial pH value, adsorbent mass, contact time and Cr 3+ initial concentration. GC showed a better performance than PC with about 100% Cr 3+ removal, due to the pH increase that caused Cr precipitation. Under pH conditions in which the adsorption prevailed (pH < 5.5), GC presented the highest uptake capacity (21.1 mg Cr 3+ g −1 char) for the following initial conditions: 50 mg Cr 3+ L −1 ; pH 5; contact time: 24 h; L/S ratio: 1000 mL g −1 . The pseudo-second order kinetic model showed the best adjustment to GC experimental data. Both the first and second order kinetic models fitted well to PC experimental data. The ion exchange was the dominant phenomenon on the Cr 3+ adsorption by GC sample. Also, this char significantly reduced the ecotoxicity of Cr 3+ solutions for the bacterium Vibrio fischeri. GC char proved to be an efficient material to remove Cr 3+ from aqueous solution, without the need for further activation.

AB - The present work aims to assess the efficiency of chars, obtained from the gasification and co-pyrolysis of rice wastes, as adsorbents of Cr 3+ from aqueous solution. GC and PC chars, produced in the gasification and co-pyrolysis, respectively, of rice husk and polyethylene were studied. Cr 3+ removal assays were optimised for the initial pH value, adsorbent mass, contact time and Cr 3+ initial concentration. GC showed a better performance than PC with about 100% Cr 3+ removal, due to the pH increase that caused Cr precipitation. Under pH conditions in which the adsorption prevailed (pH < 5.5), GC presented the highest uptake capacity (21.1 mg Cr 3+ g −1 char) for the following initial conditions: 50 mg Cr 3+ L −1 ; pH 5; contact time: 24 h; L/S ratio: 1000 mL g −1 . The pseudo-second order kinetic model showed the best adjustment to GC experimental data. Both the first and second order kinetic models fitted well to PC experimental data. The ion exchange was the dominant phenomenon on the Cr 3+ adsorption by GC sample. Also, this char significantly reduced the ecotoxicity of Cr 3+ solutions for the bacterium Vibrio fischeri. GC char proved to be an efficient material to remove Cr 3+ from aqueous solution, without the need for further activation.

KW - Chars

KW - Co-pyrolysis

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KW - Gasification

KW - Rice wastes

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