Performance of Physically and Chemically Activated Biochars in Copper Removal from Contaminated Mine Effluents
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The increasing global demand for metals and minerals justifies the intensive study of treatment options for contaminated mine effluents. The present study evaluated the conversion of wood residues into physically and chemically activated biochars and their subsequent use in the treatment of Cu in synthetic and actual contaminated mine drainage. First, wood residues were converted into biochar by fast pyrolysis. Then, physical (using steam or CO2) or chemical (using KOH) activation was carried out in a homemade pilot-scale furnace. After activation, highly microporous (KOH materials) and micro/mesoporous activated biochars (CO2 and steam materials) were obtained. Batch adsorption testing was first conducted with synthetic effluents. Results showed that CO2-activated biochar was the most Cu effective adsorbent (99% removal) at low concentrations (5–20 mg L−1). The mechanisms of Cu2+ adsorption involved physical and chemisorption for biochars and CO2-activated biochar, while chemisorption for KOH-activated biochars was probably due to the high proportion of functional groups connected to their surface. In multi-metal acid mine drainage, metal adsorption capacities deteriorated for most of the materials, probably due to the effects of ion competition. However, KOH-activated biochar decreased Cu2+ concentrations to below the authorized monthly mean allowed by Canadian law (0.3 mg L−1) and decreased Co, Pb, and Mn concentrations up to 95%. These findings indicate that high porosity and oxygenated functional groups connected to the surface of activated biochars are important properties for the enhancement of interactions between carbon materials and metals from mine effluents, as well as for their performance improvement in mine drainage treatment.
KeywordsActivated biochar Adsorption Copper removal Water treatment Actual mine effluents
This research was funded by the Québec’s Ministry of Economy, Science and Innovation (Ministère de l’Économie, de la Science et de l’Innovation du Québec), the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canada Research Chairs Program, the College of Abitibi-Témiscamingue, and the Technology Centre for Industrial Waste (Centre Technologique des Résidus Industriels) through its partners on this project, Airex Energy and Iamgold Corporation. The first author, Dr. Flavia Lega Braghiroli, also sincerely acknowledges NSERC financial support via a Banting Postdoctoral Fellowship (2017–2019). The authors also thank Anne-Marie Marleau Claveau, Félicia Porqueres, Maéva Giasson, Gilles Villeneuve, Mamadou Dia, Nicolas Bergeron, and Hélie Jacob Turmel for their assistance with the experiments, analysis, and testing in the laboratory.
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