SCIENCE@home

Biosorption of direct black dye by cassava root husks: Kinetics, equilibrium, thermodynamics and mechanism assessment

F. B. Scheufele,Júnior Staudt,Masahito Ueda,C. Ribeiro,V. Steffen,C. Borba,A. Módenes,A. Kroumov

Published 2020 in Journal of environmental chemical engineering

ABSTRACT

Abstract The objective of this study was to evaluate the removal of the direct black ECO TFA (DBET) dye from tannery industry by cassava root husks (CRH) from starch industry as a biosorbent material. For this, CRH biosorbent was characterized, in terms of textural parameters and functional groups. Based on the results, it was verified that CRH is a nonporous material, also DBET dye adsorption takes place, especially, in hydroxyl and carboxyl groups abundantly present in CRH biosorbent. Preliminary adsorption tests evidenced the most favorable operational conditions, namely, particle size mixture, lower temperature 30 °C, higher stirring speed 150 rpm (due to lower diffusional resistances) and pH 2.0 (favoring electrostatic interactions between DBET dye and CRH biosorbent). Adsorption kinetics studies evidenced favorable kinetics, described by the pseudo-second-order model, indicating that the adsorption itself as the of the overall mass transfer process, rather than diffusional ones. Equilibrium data was described by Langmuir isotherm within the evaluated temperature range (30–50 °C). Nevertheless, near-linear isotherm profiles (similar to Henry’s law) were observed. Thermodynamic parameters indicated an exothermic and physisorption process (∆Hads = −14.73 kJ mol-1). Overall, equilibrium results along with functional groups characterization and identified intermolecular interactions (e.g. electrostatic, hydrophobic and H-bond) point out that multilayer sorption mechanism most likely rules the DBET dye uptake by the CRH biosorbent. Thus, the results evidence the potential of CRH biosorbent for direct dyes removal, given the observed technical-operational features along with its renewable and residual characteristics, which provides both economic and environmental advantages for such biomaterial.

PUBLICATION RECORD

  • Publication year

    2020

  • Venue

    Journal of environmental chemical engineering

  • Publication date

    2020-04-01

  • Fields of study

    Materials Science, Chemistry, Environmental Science

  • Identifiers
    DOI 10.1016/j.jece.2019.103533
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

CITATION MAP

EXTRACTION MAP

CLAIMS

  • No claims are published for this paper.

CONCEPTS

  • No concepts are published for this paper.

REFERENCES

Showing 1-60 of 60 references · Page 1 of 1

CITED BY

Showing 1-50 of 50 citing papers · Page 1 of 1