TY - JOUR
T1 - Effect of pH, ionic strength, and background electrolytes on Cr(VI) and total chromium removal by acorn shell of Quercus crassipes Humb. & Bonpl.
AU - Aranda-García, Erick
AU - Morales-Barrera, Liliana
AU - Pineda-Camacho, Gabriela
AU - Cristiani-Urbina, Eliseo
N1 - Publisher Copyright:
© 2014, Springer International Publishing Switzerland.
PY - 2014/10/1
Y1 - 2014/10/1
N2 - The ability of Quercus crassipes acorn shells (QCS) to remove Cr(VI) and total chromium from aqueous solutions was investigated as a function of the solution pH, ionic strength, and background electrolytes. It was found that Cr(VI) and total chromium removal by QCS depended strongly on the pH of the solution. Cr(VI) removal rate increased as the solution pH decreased. The optimum pH for total chromium removal varied depending on contact time. NaCl ionic strengths lower than 200 mM did not affect chromium removal. The presence of 20 mM monovalent cations and anions, and of divalent cations, slightly decreased the removal of Cr(VI) and total chromium by QCS; in contrast, divalent anions (SO42−, PO42−, CO32−) significantly affected the removal of Cr(VI) and total chromium. The biosorption kinetics of chromium ions followed the pseudo-second-order model at all solution pH levels, NaCl ionic strengths and background electrolytes tested. Results suggest that QCS may be a potential low-cost biosorbent for the removal of Cr(VI) and total chromium from aqueous solutions containing various impurities.
AB - The ability of Quercus crassipes acorn shells (QCS) to remove Cr(VI) and total chromium from aqueous solutions was investigated as a function of the solution pH, ionic strength, and background electrolytes. It was found that Cr(VI) and total chromium removal by QCS depended strongly on the pH of the solution. Cr(VI) removal rate increased as the solution pH decreased. The optimum pH for total chromium removal varied depending on contact time. NaCl ionic strengths lower than 200 mM did not affect chromium removal. The presence of 20 mM monovalent cations and anions, and of divalent cations, slightly decreased the removal of Cr(VI) and total chromium by QCS; in contrast, divalent anions (SO42−, PO42−, CO32−) significantly affected the removal of Cr(VI) and total chromium. The biosorption kinetics of chromium ions followed the pseudo-second-order model at all solution pH levels, NaCl ionic strengths and background electrolytes tested. Results suggest that QCS may be a potential low-cost biosorbent for the removal of Cr(VI) and total chromium from aqueous solutions containing various impurities.
KW - Background electrolytes
KW - Biosorption
KW - Chromium
KW - Ionic strength
KW - Quercus crassipes
KW - pH
UR - http://www.scopus.com/inward/record.url?scp=84921651261&partnerID=8YFLogxK
U2 - 10.1007/s10661-014-3849-8
DO - 10.1007/s10661-014-3849-8
M3 - Artículo
C2 - 24880725
SN - 0167-6369
VL - 186
SP - 6207
EP - 6221
JO - Environmental Monitoring and Assessment
JF - Environmental Monitoring and Assessment
IS - 10
ER -