Removal of lead (Pb2+) from aqueous medium by using chars from co-pyrolysis

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Abstract

The effectiveness of chars from the co-pyrolysis of pine, used tires and plastic wastes for the removal of lead (Pb2+) from aqueous medium, was investigated. The chars were predominantly of macroporous nature, but the introduction of tires in the pyrolysis feedstock enhanced their mesoporous content as well as surface area. Pb2+ sorption with the chars was a slow and unstable process in which sorption-desorption seems to be competing. The highest Pb2+ removal (88%) was attained by the char resulting from the pyrolysis of a mixture composed by equal mass ratios of used tires and plastics, at 48h of contact time. This char was also the one with the overall better performance for Pb2+ sorption, achieving almost 100% of Pb2+ removal on the study of the effect of adsorbent dose. Mixing the three raw materials for pyrolysis had no advantage for the resulting char concerning the removal efficiency of Pb2+. The sorption mechanisms varied according to the pyrolysis feedstock: in chars from feedstock with pine, chemisorption involving complexation with oxygenated surface functional groups followed by cation exchange was the presumable mechanism. In tire rubber derived chars, cation exchange with Ca2+, K+, and Zn2+ played the major role on Pb2+ sorption.

Original languageEnglish
Pages (from-to)158-165
Number of pages8
JournalJournal of Colloid and Interface Science
Volume409
DOIs
Publication statusPublished - 1 Nov 2013

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Sorption
Pyrolysis
Tires
Lead
Feedstocks
Cations
Ion exchange
Positive ions
Plastics
Chemisorption
Complexation
Adsorbents
Functional groups
Desorption
Raw materials

Keywords

  • Adsorption
  • Chars
  • Co-pyrolysis
  • Lead
  • Mechanisms
  • Treatment
  • Water

Cite this

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title = "Removal of lead (Pb2+) from aqueous medium by using chars from co-pyrolysis",
abstract = "The effectiveness of chars from the co-pyrolysis of pine, used tires and plastic wastes for the removal of lead (Pb2+) from aqueous medium, was investigated. The chars were predominantly of macroporous nature, but the introduction of tires in the pyrolysis feedstock enhanced their mesoporous content as well as surface area. Pb2+ sorption with the chars was a slow and unstable process in which sorption-desorption seems to be competing. The highest Pb2+ removal (88{\%}) was attained by the char resulting from the pyrolysis of a mixture composed by equal mass ratios of used tires and plastics, at 48h of contact time. This char was also the one with the overall better performance for Pb2+ sorption, achieving almost 100{\%} of Pb2+ removal on the study of the effect of adsorbent dose. Mixing the three raw materials for pyrolysis had no advantage for the resulting char concerning the removal efficiency of Pb2+. The sorption mechanisms varied according to the pyrolysis feedstock: in chars from feedstock with pine, chemisorption involving complexation with oxygenated surface functional groups followed by cation exchange was the presumable mechanism. In tire rubber derived chars, cation exchange with Ca2+, K+, and Zn2+ played the major role on Pb2+ sorption.",
keywords = "Adsorption, Chars, Co-pyrolysis, Lead, Mechanisms, Treatment, Water",
author = "Maria Bernardo and Sandra Mendes and Nuno Lapa and Margarida Gon{\cc}alves and Benilde Mendes and Filomena Pinto and Helena Lopes and Isabel Fonseca",
note = "The authors would like to acknowledge the Portuguese Foundation for Science and Technology (FCT-MEC) for the financial support of Maria Bernardo with the doctoral Grant SFRH/BD/43354/2008.",
year = "2013",
month = "11",
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T1 - Removal of lead (Pb2+) from aqueous medium by using chars from co-pyrolysis

AU - Bernardo, Maria

AU - Mendes, Sandra

AU - Lapa, Nuno

AU - Gonçalves, Margarida

AU - Mendes, Benilde

AU - Pinto, Filomena

AU - Lopes, Helena

AU - Fonseca, Isabel

N1 - The authors would like to acknowledge the Portuguese Foundation for Science and Technology (FCT-MEC) for the financial support of Maria Bernardo with the doctoral Grant SFRH/BD/43354/2008.

PY - 2013/11/1

Y1 - 2013/11/1

N2 - The effectiveness of chars from the co-pyrolysis of pine, used tires and plastic wastes for the removal of lead (Pb2+) from aqueous medium, was investigated. The chars were predominantly of macroporous nature, but the introduction of tires in the pyrolysis feedstock enhanced their mesoporous content as well as surface area. Pb2+ sorption with the chars was a slow and unstable process in which sorption-desorption seems to be competing. The highest Pb2+ removal (88%) was attained by the char resulting from the pyrolysis of a mixture composed by equal mass ratios of used tires and plastics, at 48h of contact time. This char was also the one with the overall better performance for Pb2+ sorption, achieving almost 100% of Pb2+ removal on the study of the effect of adsorbent dose. Mixing the three raw materials for pyrolysis had no advantage for the resulting char concerning the removal efficiency of Pb2+. The sorption mechanisms varied according to the pyrolysis feedstock: in chars from feedstock with pine, chemisorption involving complexation with oxygenated surface functional groups followed by cation exchange was the presumable mechanism. In tire rubber derived chars, cation exchange with Ca2+, K+, and Zn2+ played the major role on Pb2+ sorption.

AB - The effectiveness of chars from the co-pyrolysis of pine, used tires and plastic wastes for the removal of lead (Pb2+) from aqueous medium, was investigated. The chars were predominantly of macroporous nature, but the introduction of tires in the pyrolysis feedstock enhanced their mesoporous content as well as surface area. Pb2+ sorption with the chars was a slow and unstable process in which sorption-desorption seems to be competing. The highest Pb2+ removal (88%) was attained by the char resulting from the pyrolysis of a mixture composed by equal mass ratios of used tires and plastics, at 48h of contact time. This char was also the one with the overall better performance for Pb2+ sorption, achieving almost 100% of Pb2+ removal on the study of the effect of adsorbent dose. Mixing the three raw materials for pyrolysis had no advantage for the resulting char concerning the removal efficiency of Pb2+. The sorption mechanisms varied according to the pyrolysis feedstock: in chars from feedstock with pine, chemisorption involving complexation with oxygenated surface functional groups followed by cation exchange was the presumable mechanism. In tire rubber derived chars, cation exchange with Ca2+, K+, and Zn2+ played the major role on Pb2+ sorption.

KW - Adsorption

KW - Chars

KW - Co-pyrolysis

KW - Lead

KW - Mechanisms

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