TY - JOUR
T1 - Treatment of waste H 2SO 4 with Mg-Al oxide obtained by calcination of NO 3 -intercalated Mg-Al layered double hydroxide
T2 - Kinetics and equilibrium
AU - Kameda, Tomohito
AU - Fubasami, Yuki
AU - Yoshioka, Toshiaki
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/4/1
Y1 - 2012/4/1
N2 - Mg-Al oxide obtained by calcination of NO 3 -- intercalated Mg-Al layered double hydroxide (NO 3̇Mg-Al LDH) was used to treat H 2SO 4, acting as both a neutralizer of the acid and a fixative for SO 4 2-. The fraction of SO 4 2- removed increased with time and with increasing Mg-Al oxide quantity and temperature. The rate of SO 4 2- removal followed first-order kinetics with apparent rate constants of 2.0 × 10 -3, 4.4 × 10 -3, and 5.3 × 10 -2 min -1 at 10, 30, and 60°C, respectively. The apparent activation energy was 52.1 kJ mol -1, confirming that the SO 4 2- removal by Mg-Al oxide proceeded under chemical reaction control. Furthermore, the adsorption isotherm of SO 4 2- by Mg-Al oxide obeyed the Langmuir equation. The maximum adsorption amount was 2.0 mmol g -1, or 4.0 meq g -1, indicating that Mg-Al oxide has a large capacity for uptake of SO 4 2- from H 2SO 4.
AB - Mg-Al oxide obtained by calcination of NO 3 -- intercalated Mg-Al layered double hydroxide (NO 3̇Mg-Al LDH) was used to treat H 2SO 4, acting as both a neutralizer of the acid and a fixative for SO 4 2-. The fraction of SO 4 2- removed increased with time and with increasing Mg-Al oxide quantity and temperature. The rate of SO 4 2- removal followed first-order kinetics with apparent rate constants of 2.0 × 10 -3, 4.4 × 10 -3, and 5.3 × 10 -2 min -1 at 10, 30, and 60°C, respectively. The apparent activation energy was 52.1 kJ mol -1, confirming that the SO 4 2- removal by Mg-Al oxide proceeded under chemical reaction control. Furthermore, the adsorption isotherm of SO 4 2- by Mg-Al oxide obeyed the Langmuir equation. The maximum adsorption amount was 2.0 mmol g -1, or 4.0 meq g -1, indicating that Mg-Al oxide has a large capacity for uptake of SO 4 2- from H 2SO 4.
KW - H SO
KW - Mg-Al oxide
KW - NO intercalated Mg-Al layered double hydroxide
KW - equilibrium
KW - kinetics
KW - treatment
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U2 - 10.1080/10934529.2012.660080
DO - 10.1080/10934529.2012.660080
M3 - Article
C2 - 22416865
AN - SCOPUS:84859166999
VL - 47
SP - 711
EP - 717
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
SN - 1093-4529
IS - 5
ER -