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

5 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

Keywords

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

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