TY - JOUR
T1 - Removal of hexavalent and total chromium from aqueous solution by avocado shell
AU - Cristiani-Urbina, Eliseo
AU - Netzahuatl-Munoz, Alma Rosa
AU - Cristiani-Urbina, Maria Del Carmen
PY - 2011
Y1 - 2011
N2 - The main aim of this work was to evaluate the potential of Hass avocado (Persea americana Mill var. 'Hass') shell to remove hexavalent chromium [Cr(VI)] and total chromium from aqueous solutions. Results showed that avocado shell removed Cr(VI) by two different mechanisms: chromium biosorption and bioreduction of Cr(VI) to Cr(III). The capacity for removing Cr(VI) and total chromium gradually increased as the contact time proceeded, reaching values of 101.81 and 61.67 mg g-1 respectively, after 120 h. The opposite behavior was observed concerning the volumetric rates of Cr(VI) and total chromium removal. The pseudo-second order model adequately described the kinetic process of chromium biosorption by avocado shell, which suggests that this process chiefly occurs as a result of chemisorption.
AB - The main aim of this work was to evaluate the potential of Hass avocado (Persea americana Mill var. 'Hass') shell to remove hexavalent chromium [Cr(VI)] and total chromium from aqueous solutions. Results showed that avocado shell removed Cr(VI) by two different mechanisms: chromium biosorption and bioreduction of Cr(VI) to Cr(III). The capacity for removing Cr(VI) and total chromium gradually increased as the contact time proceeded, reaching values of 101.81 and 61.67 mg g-1 respectively, after 120 h. The opposite behavior was observed concerning the volumetric rates of Cr(VI) and total chromium removal. The pseudo-second order model adequately described the kinetic process of chromium biosorption by avocado shell, which suggests that this process chiefly occurs as a result of chemisorption.
UR - http://www.scopus.com/inward/record.url?scp=79955510071&partnerID=8YFLogxK
U2 - 10.3303/CET1124224
DO - 10.3303/CET1124224
M3 - Artículo
AN - SCOPUS:79955510071
SN - 2283-9216
VL - 24
SP - 1339
EP - 1344
JO - Chemical Engineering Transactions
JF - Chemical Engineering Transactions
ER -