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  <titleInfo>
    <title>Efficiency of H2O2-treated eucalyptus biochar on the removal of Cu(II), Cd(II) and Ni(II) from aqueous solution</title>
  </titleInfo>
  <name type="personal">
    <namePart>Souza, Elias Costa de</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Pimenta, Alexandre Santos</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Silva, Alfredo José Ferreira da</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Braga, Renata Martins</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Azevedo, Tatiane Kelly Barbosa de</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Medeiros Neto, Pedro Nicó de</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
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  <genre authority="marc">abstract or summary</genre>
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  <abstract>


ABSTRACT:     The present work had the goal to produce H2O2-treated biochar from eucalyptus wood and testing its efficiency in the  removal  of  heavy  metals  from  aqueous  solutions.  Oxidizing  treatment  was  performed  by  reacting  biochar  with  H2O2  (10%  m/m) during 4 hours at pH 8.0 and 80 °C. Fresh and H2O2-treated biochar samples were characterized by thermogravimetry and elemental analysis. Point of zero charge and specific surface area were determined. Adsorption kinetics tests with Cu were carried out  and  Langmuir  and  Freundlich  isotherms  were  adjusted.  Adsorption  tests  were  conducted  with  a  mixture  of  Cu,  Ni  and  Cd  cations in aqueous solution. The best adsorption capacity was achieved in acid pH. H2O2-treated biochar had adsorption capacity of 170.41 mg L-1 for Cu alone and 305.35 mg L-1 for the mixture of metals. Adsorption was best predicted by the Langmuir isotherm (R2 = 0.9976). Despite the significant decrease in the specific surface area, the H2O2-treated biochar showed better performance in the adsorption of heavy metals compared to the original biochar, especially in the presence of more than one metallic cation.  


Key words:     adsorption of heavy metals; biochar; kinetics of adsorption; oxidation with hydrogen peroxide</abstract>
  <abstract>


RESUMO:     O presente trabalho teve como objetivo produzir carvão tratado com H2O2 a partir de madeira de eucalipto e testar sua eficiência na remoção de metais pesados   de soluções aquosas. O tratamento oxidante foi realizado por reação do carvão com H2O2 (10% m/m) durante 4 horas com temperatura de 80 °C e pH 8,0. Amostras de biochar com e sem tratamento com H2O2 foram caracterizadas por termogravimetria e análise elementar. O ponto de carga zero e a área superficial específica foram  determinadas.  Foram  realizados  testes  de  cinética  de  adsorção  com  Cu  (II)  e  ajustadas  as  isotermas  de  Langmuir  e  Freundlich. Os testes de adsorção foram realizados com uma mistura de cátions Cu (II), Ni (II) e Cd (II) em solução aquosa. A melhor capacidade de adsorção foi alcançada no pH ácido. O carvão tratado com H2O2 teve capacidade de adsorção de 170,41 mg L-1 somente para Cu e 305,35 mg L-1 para a mistura de metais. A adsorção foi melhor estimada pela isoterma de Langmuir (R2 = 0,9976). Apesar da redução significativa na área superficial específica, o carvão tratado com H2O2 apresentou melhor desempenho na adsorção de metais pesados   em comparação com o carvão original, especialmente na presença de mais de um cátion metálico.   



Palavras-chave:      adsorção de metais pesados; biocarvão; cinéticas de absorção; oxidação com peróxido de hidrogênio</abstract>
  <note>

Publicação online; 10 illus.; 8 tables; Summaries (En, Pt); Bibliography p. 10-13</note>
  <subject>
    <topic>EUCALIPTO</topic>
  </subject>
  <subject>
    <topic>MADEIRA</topic>
  </subject>
  <subject>
    <topic>ADSORÇÃO</topic>
  </subject>
  <subject>
    <topic>METAL PESADO</topic>
  </subject>
  <subject>
    <topic>CARVÃO</topic>
  </subject>
  <relatedItem type="host">
    <titleInfo>
      <title>Revista Brasileira de Ciências Agrárias (Brazil)</title>
    </titleInfo>
    <originInfo>
      <publisher>Recife-PE Universidade Federal Rural de Pernambuco 2006</publisher>
    </originInfo>
    <identifier>2026-1793</identifier>
    <identifier type="issn">1981-1160</identifier>
    <identifier type="local">BR2026000550</identifier>
    <part>
      <text>v. 15(3) p. 1-13; (2020)</text>
    </part>
  </relatedItem>
  <identifier type="uri">http://www.agraria.pro.br/ojs32/index.php/RBCA/article/view/v15i3a6530/51</identifier>
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    <url>http://www.agraria.pro.br/ojs32/index.php/RBCA/article/view/v15i3a6530/51</url>
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    <recordCreationDate encoding="marc">260506</recordCreationDate>
    <recordChangeDate encoding="iso8601">20260506141701.0</recordChangeDate>
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