TY - JOUR
T1 - Cr(III) removal from tannery effluents using silica obtained from rice husk and modified silica
AU - Gutiérrez-Valtierra, Moises
AU - Salazar-Hernández, Carmen
AU - Mendoza-Miranda, Juan Manuel
AU - Elorza-Rodríguez, Enrique
AU - Puy-Alquiza, María Jesús
AU - Caudillo-González, Martín
AU - Salazar-Hernández, Ma Mercedes
N1 - Publisher Copyright:
© 2019 Desalination Publications. All rights reserved.
PY - 2019/8
Y1 - 2019/8
N2 - Silica extracted from rice husk, which is represented as SRH, is inexpensive mesoporous silica useful for heavy metal removal from industrial waste effluents. SRH was synthesized through calcination at 650°C in an oxidant atmosphere obtaining a mesoporous silica with BET area of 297 m2 g-1 and 2.3 nm of pore diameter average, respectively. The surface of this silica was modified through a post-synthesis route with amine and polyamine groups obtained at 16% and 47% of modified surface with amine or polyamine groups (SRH-NH2 and SRH-triamine). The chromium(III) removal capacity of SRH and amine-modified silica was tested with stock solutions, observing a fast sorption process and reaching its equilibrium adsorption time in 20 min. The resulting Cr(III) removal capacity was 6.7, 22.1 and 34.3 mg g-1 for SRH, SRH-NH2 and SRH-triamine silicas, respectively. SRH and SRH amine silicas were used to remove Cr(III) from a sample taken from a tannery waste effluent from the city of Leon, Guanajuato, Mexico, and displayed a 70% and 90% removal, respectively. Our results confirm the ability of these inexpensive silicas to adsorb materials and their potential use in heavy metals removal processes from industrial waste effluents.
AB - Silica extracted from rice husk, which is represented as SRH, is inexpensive mesoporous silica useful for heavy metal removal from industrial waste effluents. SRH was synthesized through calcination at 650°C in an oxidant atmosphere obtaining a mesoporous silica with BET area of 297 m2 g-1 and 2.3 nm of pore diameter average, respectively. The surface of this silica was modified through a post-synthesis route with amine and polyamine groups obtained at 16% and 47% of modified surface with amine or polyamine groups (SRH-NH2 and SRH-triamine). The chromium(III) removal capacity of SRH and amine-modified silica was tested with stock solutions, observing a fast sorption process and reaching its equilibrium adsorption time in 20 min. The resulting Cr(III) removal capacity was 6.7, 22.1 and 34.3 mg g-1 for SRH, SRH-NH2 and SRH-triamine silicas, respectively. SRH and SRH amine silicas were used to remove Cr(III) from a sample taken from a tannery waste effluent from the city of Leon, Guanajuato, Mexico, and displayed a 70% and 90% removal, respectively. Our results confirm the ability of these inexpensive silicas to adsorb materials and their potential use in heavy metals removal processes from industrial waste effluents.
KW - Amine modified SRH
KW - Cr(III) removal
KW - Industrial waste effluents
KW - Silica rice husk
UR - http://www.scopus.com/inward/record.url?scp=85067928915&partnerID=8YFLogxK
U2 - 10.5004/dwt.2019.24184
DO - 10.5004/dwt.2019.24184
M3 - Artículo
AN - SCOPUS:85067928915
SN - 1944-3994
VL - 158
SP - 152
EP - 163
JO - Desalination and Water Treatment
JF - Desalination and Water Treatment
ER -