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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Combined Analytical Py-GC/MS, SEM, FTIR and 13C NMR for Investigating the Removal of Trace Metals from Aqueous Solutions by Biochar

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Author(s):
Minéia A. M. de Andrade ; Adnívia S. C. Monteiro ; Erik S. J. Gontijo ; Carolina C. Bueno ; João C. A. Macedo ; Elidiane C. Rangel ; Darllene S. Melo ; José I. Z. Montero ; André H. Rosa
Total Authors: 9
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 31, n. 7, p. 1518-1530, Jul. 2020.
Abstract

In this study, the efficiency of biochar (BC) produced from sugarcane bagasse at different pyrolysis temperatures (300, 400, 500 and 600 ºC) for simultaneous removal of CdII, PbII, CuII, CrIII, NiII and ZnII ions from aqueous solutions was assessed. All BC were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), 13C nuclear magnetic resonance (13C NMR) and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS). The effects of pyrolysis temperature, initial adsorbate concentration and adsorbent dosage on adorption capacity of BC were examined through batch experiments. The BC efficiency was also evaluated after a desorption cycle. The maximal adsorptions (CdII: 51.50%, CrIII: 74.35%, CuII: 91.18%, NiII: 47.05%, PbII: 96.17% and ZnII: 40.50%) were observed for BC produced at 500 ºC, probably because of its higher porosity and presence of functional groups detected by SEM and FTIR. The maximum adsorption capacity for CdII, CrIII, CuII, NiII and ZnII (ions fitted to Langmuir model) were 175, 303, 455, 156 and 128 µg g-1, respectively. The predominance of phenolic groups observed in Py-GC-MS data may explain the high percentage of multi-element removal. Experimental data were best fitted to pseudo-second order, Sips and Freundlich models. The BC presented good removal results after a desorption cycle. (AU)

FAPESP's process: 16/08215-4 - REUTILIZATION OF WASTE AND DETOXIFICATION OF WASTEWATER: EVALUATION OF THE POTENTIAL APPLICATION OF BIOCHAR FOR THE REMOVAL OF EMERGING CONTAMINANTS AND PONTENTIALLY TOXIC METALS
Grantee:André Henrique Rosa
Support type: Regular Research Grants
FAPESP's process: 16/17343-6 - Evaluation of biochar application for removal of emerging contaminants in wasterwater
Grantee:Minéia Aparecida de Moraes de Andrade
Support type: Scholarships in Brazil - Master