Use of chemically treated human hair wastes for the removal of heavy metal ions from water
Zhang, Helan (Universitat Autònoma de Barcelona. Departament de Química)
Carrillo Navarrete, Fernando (Universitat Politècnica de Catalunya. Departament d'Enginyeria Química)
López-Mesas, Montserrat (Universitat Autònoma de Barcelona. Departament de Química)
Palet i Ballús, Cristina (Universitat Autònoma de Barcelona. Departament de Química)
Data: |
2020 |
Resum: |
Human hair is considered a ubiquitous waste product and its accumulation can cause environmental problems. Hence, the search for alternatives that take advantage of this waste as a new raw material is of interest, and contributes to the idea of the circular economy. In this study, chemically modified human hair was used as a low cost biosorbent for the removal of heavy metal ions from aqueous solutions. The effect of the contact time, the pH, and the biosorbent concentration on the biosorption process were investigated. Kinetic modeling indicated that the pseudo-second order kinetic equation fitted well with R > 0. 999. Furthermore, the equilibrium data fitted the Langmuir adsorption isotherm at 295 K resulting in saturation concentrations of 9. 47 × 10, 5. 57 × 10, 3. 77 × 10, and 3. 61 × 10 mol/g for the sorption of Cr(III), Cu(II), Cd(II), and Pb(II), respectively. The biosorption process did not change the chemical structure and morphology of the hair, which was shown by FTIR and SEM. In addition, desorption experiments prove that 0. 1 mol/L EDTA solution is an efficient eluent for the recovery of Pb(II) from the treated human hair. To summarize, treated human hair showed satisfactory biosorption capacity and can be considered as an effective biosorbent for the treatment of water with a low concentration of heavy metal ions. |
Ajuts: |
Ministerio de Economía y Competitividad CTM2012-30970 Ministerio de Economía y Competitividad CTM2015-65414-C2-1-R
|
Nota: |
Altres ajuts: Ministerio de Ciencia e Innovación del Gobierno de España |
Drets: |
Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: |
Anglès |
Document: |
Article ; recerca ; Versió publicada |
Matèria: |
Human hair ;
Heavy metal ;
Kinetics ;
Isotherms ;
Biosorption |
Publicat a: |
Water, Vol. 12, Issue 5 (May 2020) , art. 1263, ISSN 2073-4441 |
DOI: 10.3390/W12051263
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