Graduate School of Environmental Studies, Tohoku University, 6-6-07 Aoba, Aramaki, Sendai 980-8579, Japan.
J Colloid Interface Sci. 2011 Oct 15;362(2):497-502. doi: 10.1016/j.jcis.2011.06.065. Epub 2011 Jul 6.
Mg-Al oxide obtained by thermal decomposition of NO(3)(-)-intercalated Mg-Al layered double hydroxide (NO(3)·Mg-Al LDH) was found to treat HNO(3), acting as both a neutralizer and fixative for NO(3)(-). The degree of NO(3)(-) removal increased with time, Mg-Al oxide quantity, and temperature. The NO(3)(-) removal could be represented by a first-order reaction. The apparent activation energy was 52.9 kJ mol(-1), confirming that NO(3)(-) removal by Mg-Al oxide proceeded under chemical reaction control. Furthermore, the adsorption of NO(3)(-) on Mg-Al oxide could be expressed by a Langmuir-type adsorption isotherm. The maximum adsorption amount and equilibrium adsorption constant were 3.8 mmol g(-1) and 1.33, respectively. The Gibbs free energy change was -18 kJ mol(-1), confirming that the uptake of NO(3)(-) from HNO(3) by Mg-Al oxide proceeded spontaneously.
通过热分解插层的硝酸根（NO3-）-镁铝层状双氢氧化物（NO3·Mg-Al LDH）得到的 Mg-Al 氧化物被发现可用于处理 HNO3，同时充当 NO3-的中和剂和固定剂。NO3-的去除程度随时间、Mg-Al 氧化物的量和温度的增加而增加。NO3-的去除可以用一级反应来表示。表观活化能为 52.9 kJ mol-1，证实了 Mg-Al 氧化物通过化学反应控制进行 NO3-的去除。此外，NO3-在 Mg-Al 氧化物上的吸附可以用 Langmuir 型吸附等温线来表示。最大吸附量和平衡吸附常数分别为 3.8 mmol g-1 和 1.33。吉布斯自由能变化为-18 kJ mol-1，证实了 Mg-Al 氧化物从 HNO3 中自发地吸收 NO3-。
