Peng Hui Hua, Chen Jie, Jiang De Yi, Guo Xiao Long, Chen Hao, Zhang Yu Xin
College of Resources and Environmental Science, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China.
College of Materials Science and Engineering, Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, PR China.
Dalton Trans. 2016 Jun 28;45(26):10530-8. doi: 10.1039/c6dt00335d.
MnOx-decorated MgAl layered double oxide (M-LDO) was fabricated via merging of memory effect and anion intercalation, accompanied by the reduction/calcination process. The as-obtained nanocomposites were characterized by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), powder X-ray diffraction (XRD) and N2 adsorption-desorption. To clarify the detailed formation mechanism, optimized calcination temperature/time and temperature for methyl orange (MO) adsorption were investigated. Adsorption experiments showed that the adsorption behaviour fitted well with a Langmuir isotherm and pseudo-second-order model, and the maximum adsorption capacity calculated from the Langmuir model was 555.55 mg g(-1). The adsorption process was exothermic and spontaneous in nature. Moreover, the used adsorbent could be regenerated for at least five cycles (94% removal retained) through a thermal procedure, indicating that the M-LDO hybrid is a promising adsorbent with promising ability to remove anionic dye pollutants from wastewater.
通过记忆效应和阴离子插层的结合，并伴随着还原/煅烧过程，制备了MnO x修饰的MgAl层状双氧化物（M-LDO）。通过扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HRTEM）、粉末X射线衍射（XRD）和N2吸附-脱附对所得纳米复合材料进行了表征。为了阐明详细的形成机理，研究了优化的煅烧温度/时间以及甲基橙（MO）吸附温度。吸附实验表明，吸附行为符合Langmuir等温线和准二级模型，根据Langmuir模型计算的最大吸附容量为555.55 mg g(-1)。吸附过程本质上是放热和自发的。此外，用过的吸附剂可以通过热程序再生至少五个循环（保留94%的去除率），这表明M-LDO杂化物是一种有前途的吸附剂，具有从废水中去除阴离子染料污染物的良好能力。
