Study of the removal mechanism of aquatic emergent pollutants by new bio-based chars

Maria Manuel Serrano Bernardo, Catarina Alexandra Catanas Madeira, Nuno Carlos Lapa dos Santos Nunes, Diogo André Costa Messias Dias, Delfina Maria Barbosa Godinho, Maria Filomena de Jesus Pinto, Inês Alexandra Morgado do Nascimento Matos, Ana Paula Batista Carvalho, Isabel Maria de Figueiredo Ligeiro Fonseca

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This work is dedicated to study the potential application of char byproducts obtained in the gasification of rice husk (RG char) and rice husk blended with corn cob (RCG char) as removal agents of two emergent aquatic contaminants: tetracycline and caffeine. The chars presented high ash contents (59.5–81.5%), being their mineral content mainly composed of silicon (as silica) and potassium. The samples presented a strong basic character, which was related to its higher mineral oxides content. RCG char presented better textural properties with a higher apparent surface area (144 m2 g−1) and higher micropore content (Vmicro = 0.05 cm3 g−1). The alkaline character of both chars promoted high ecotoxicity levels on their aqueous eluates; however, the ecotoxic behaviour was eliminated after pH correction. Adsorption experiments showed that RG char presented higher uptake capacity for both tetracycline (12.9 mg g−1) and caffeine (8.0 mg g−1), indicating that textural properties did not play a major role in the adsorption process. For tetracycline, the underlying adsorption mechanism was complexation or ion exchange reactions with the mineral elements of chars. The higher affinity of RG char to caffeine was associated with the higher alkaline character presented by this char.

Original languageEnglish
Pages (from-to)22698-22708
Number of pages11
JournalEnvironmental Science and Pollution Research
Volume24
Issue number28
DOIs
Publication statusPublished - 1 Oct 2017

Fingerprint

Caffeine
Trout
Tetracycline
Ashes
adsorption
Adsorption
Minerals
pollutant
mineral
rice
Oxide minerals
Silicon
Complexation
Gasification
complexation
Silicon Dioxide
silicon
Byproducts
Potassium
ion exchange

Keywords

  • Char
  • Corn cob
  • Gasification
  • Pharmaceutical
  • Rice husk
  • Water

Cite this

Bernardo, Maria Manuel Serrano ; Madeira, Catarina Alexandra Catanas ; dos Santos Nunes, Nuno Carlos Lapa ; Dias, Diogo André Costa Messias ; Godinho, Delfina Maria Barbosa ; de Jesus Pinto, Maria Filomena ; do Nascimento Matos, Inês Alexandra Morgado ; Carvalho, Ana Paula Batista ; Fonseca, Isabel Maria de Figueiredo Ligeiro. / Study of the removal mechanism of aquatic emergent pollutants by new bio-based chars. In: Environmental Science and Pollution Research. 2017 ; Vol. 24, No. 28. pp. 22698-22708.
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abstract = "This work is dedicated to study the potential application of char byproducts obtained in the gasification of rice husk (RG char) and rice husk blended with corn cob (RCG char) as removal agents of two emergent aquatic contaminants: tetracycline and caffeine. The chars presented high ash contents (59.5–81.5{\%}), being their mineral content mainly composed of silicon (as silica) and potassium. The samples presented a strong basic character, which was related to its higher mineral oxides content. RCG char presented better textural properties with a higher apparent surface area (144 m2 g−1) and higher micropore content (Vmicro = 0.05 cm3 g−1). The alkaline character of both chars promoted high ecotoxicity levels on their aqueous eluates; however, the ecotoxic behaviour was eliminated after pH correction. Adsorption experiments showed that RG char presented higher uptake capacity for both tetracycline (12.9 mg g−1) and caffeine (8.0 mg g−1), indicating that textural properties did not play a major role in the adsorption process. For tetracycline, the underlying adsorption mechanism was complexation or ion exchange reactions with the mineral elements of chars. The higher affinity of RG char to caffeine was associated with the higher alkaline character presented by this char.",
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Study of the removal mechanism of aquatic emergent pollutants by new bio-based chars. / Bernardo, Maria Manuel Serrano; Madeira, Catarina Alexandra Catanas; dos Santos Nunes, Nuno Carlos Lapa; Dias, Diogo André Costa Messias; Godinho, Delfina Maria Barbosa; de Jesus Pinto, Maria Filomena; do Nascimento Matos, Inês Alexandra Morgado; Carvalho, Ana Paula Batista; Fonseca, Isabel Maria de Figueiredo Ligeiro.

In: Environmental Science and Pollution Research, Vol. 24, No. 28, 01.10.2017, p. 22698-22708.

Research output: Contribution to journalArticle

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T1 - Study of the removal mechanism of aquatic emergent pollutants by new bio-based chars

AU - Bernardo, Maria Manuel Serrano

AU - Madeira, Catarina Alexandra Catanas

AU - dos Santos Nunes, Nuno Carlos Lapa

AU - Dias, Diogo André Costa Messias

AU - Godinho, Delfina Maria Barbosa

AU - de Jesus Pinto, Maria Filomena

AU - do Nascimento Matos, Inês Alexandra Morgado

AU - Carvalho, Ana Paula Batista

AU - Fonseca, Isabel Maria de Figueiredo Ligeiro

N1 - sem pdf conforme despacho. National Funds through FCT-Foundation for Science and Technology - PTDC/AAG-REC/3477/2012-RICEVALORB; FCOMP-01-0124-FEDER-027827. Portuguese Foundation for Science and Technology (FCT) - SFRH/BPD/93407/2013; FCT - UID/MULTI/00612/2013; UID/QUI/50006/2013.

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KW - Char

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KW - Gasification

KW - Pharmaceutical

KW - Rice husk

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