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Treatment of waste H2SO4 with Mg−Al oxide obtained by calcination of NO3 −−intercalated Mg−Al layered double hydroxide: Kinetics and equilibrium
Mg−Al oxide obtained by calcination of NO3 −-intercalated Mg−Al layered double hydroxide (NO3•Mg−Al LDH) was used to treat H2SO4, acting as both a neutralizer of the acid and a fixative for SO4 2−. The fraction of SO4 2− removed increased with time and with increasing Mg−Al oxide quantity and temperature. The rate of SO4 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 SO4 2− removal by Mg−Al oxide proceeded under chemical reaction control. Furthermore, the adsorption isotherm of SO4 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 SO4 2− from H2SO4.
Treatment of waste H2SO4 with Mg−Al oxide obtained by calcination of NO3 −−intercalated Mg−Al layered double hydroxide: Kinetics and equilibrium
Mg−Al oxide obtained by calcination of NO3 −-intercalated Mg−Al layered double hydroxide (NO3•Mg−Al LDH) was used to treat H2SO4, acting as both a neutralizer of the acid and a fixative for SO4 2−. The fraction of SO4 2− removed increased with time and with increasing Mg−Al oxide quantity and temperature. The rate of SO4 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 SO4 2− removal by Mg−Al oxide proceeded under chemical reaction control. Furthermore, the adsorption isotherm of SO4 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 SO4 2− from H2SO4.
Treatment of waste H2SO4 with Mg−Al oxide obtained by calcination of NO3 −−intercalated Mg−Al layered double hydroxide: Kinetics and equilibrium
Kameda, Tomohito (Autor:in) / Fubasami, Yuki (Autor:in) / Yoshioka, Toshiaki (Autor:in)
Journal of Environmental Science and Health, Part A ; 47 ; 711-717
01.04.2012
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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