Influence of Pyrolysis Temperature on Cadmium and Zinc Sorption Capacity of Sugar Cane Straw-Derived Biochar

Autor(es)

Melo, Leonidas C. A. ^[1] ; Coscione, Aline R. ^[2] ; Abreu, Cleide A. ^[2] ; Puga, Aline P. ^[2] ; Camargo, Otvio A. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Vicosa, Dept Solos, BR-36570000 Vicosa, MG - Brazil

^[2] Inst Agron Campinas, Ctr Solos & Recursos Ambientais, BR-13020902 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BIORESOURCES; v. 8, n. 4, p. 4992-5004, 2013.
• Citações Web of Science: 42

Resumo

The effect of pyrolysis temperature on the characteristics and metal sorption capacity of sugar cane straw derived-biochar (BC) was investigated. Biochar was produced at four temperatures (400, 500, 600, and 700 degrees C) before characterization for yield, ash and moisture content, pH, EC, pH(PZC), elemental composition, nutrient content, CEC, TGA, and functional groups (FT-IR). Biochar alone and in mixtures containing 10%, w/w biochar with one of two different tropical soils (Entisol and Oxisol) was shaken for 24 h with a 2.0 mM solution (pH 4.5) of Zn or Cd in a batch sorption test. Increasing the pyrolysis temperature led to a reduction in the O/C and H/C molar ratios. The sorption capacity of biochar pyrolyzed at 700 degrees C was nearly four times greater than that produced at 400 degrees C. In the Entisol mixture, there was an increase up to seven-fold in the sorption of both Cd and Zn compared with the control (without BC). In the Oxisol mixture, there was a maximum 20% increase in sorption compared with the control. For the remediation of Cd- and Zn-contaminated substrates, the use of higher pyrolysis temperature biochars are recommended because of their higher metal sorption capacities. (AU)

• Processo FAPESP: 11/02844-6 - Imobilização de elementos potencialmente tóxicos por biochar em solos contaminados por atividades de mineração
• Beneficiário: Leônidas Carrijo Azevedo Melo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 11/12346-3 - Imobilização de elementos potencialmente tóxicos por biochar em solos contaminados por atividades de mineração
• Beneficiário: Otávio Antonio de Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular