TY - JOUR
T1 - Use of natural mordenite to remove chromium (III) and to neutralize pH of alkaline waste waters
AU - Córdova-Rodríguez, Valduvina
AU - Rodríguez-Iznaga, Inocente
AU - Acosta-Chávez, Raquel Mariá
AU - Chávez-Rivas, Fernando
AU - Petranovskii, Vitalii
AU - Pestryakov, Alexey
N1 - Publisher Copyright:
© 2016 Taylor and Francis Group, LLC.
PY - 2016/4/15
Y1 - 2016/4/15
N2 - The natural mordenite from Palmarito de Cauto deposit (PZ), Cuba, was studied in this work as an ion exchanger to remove Cr3+ cations from alkaline aqueous solutions at different pH and chromium concentrations. The mordenite stability under cyclic treatment processes with alkaline solutions and its capacity to decrease the pH of the solutions was also analyzed. It was shown that PZ removes Cr3+ ions from alkaline solutions, and it happens independently of the starting chromium concentration and the pH of the exchange solution used. This material has an important neutralizing effect on alkaline solutions, expressed in a significant pH decrease from the early stages of the treatments. For solutions with initial pH equal to 11, it decreases to a value of around seven. The stability of this material is not affected significantly after continuous cyclic treatment with NaOH solution, which shows that mordenite, in particular from Palmarito de Cauto deposit, has high stability in alkaline solutions. The results are important as they suggest that natural zeolites may be of interest in treatments of alkaline industrial waste effluents.
AB - The natural mordenite from Palmarito de Cauto deposit (PZ), Cuba, was studied in this work as an ion exchanger to remove Cr3+ cations from alkaline aqueous solutions at different pH and chromium concentrations. The mordenite stability under cyclic treatment processes with alkaline solutions and its capacity to decrease the pH of the solutions was also analyzed. It was shown that PZ removes Cr3+ ions from alkaline solutions, and it happens independently of the starting chromium concentration and the pH of the exchange solution used. This material has an important neutralizing effect on alkaline solutions, expressed in a significant pH decrease from the early stages of the treatments. For solutions with initial pH equal to 11, it decreases to a value of around seven. The stability of this material is not affected significantly after continuous cyclic treatment with NaOH solution, which shows that mordenite, in particular from Palmarito de Cauto deposit, has high stability in alkaline solutions. The results are important as they suggest that natural zeolites may be of interest in treatments of alkaline industrial waste effluents.
KW - Cr(III) removal
KW - natural zeolites
KW - pH neutralization
KW - waste effluents
UR - http://www.scopus.com/inward/record.url?scp=84975795333&partnerID=8YFLogxK
U2 - 10.1080/10934529.2015.1120536
DO - 10.1080/10934529.2015.1120536
M3 - Artículo
SN - 1093-4529
VL - 51
SP - 425
EP - 433
JO - Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
JF - Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
IS - 5
ER -