El-Sayed Mona, Eshaq Gh, ElMetwally A E
Department of Analysis and Evaluation, Egyptian Petroleum Research Institute, Cairo, Egypt E-mail:
Department of Petrochemicals, Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt.
Water Sci Technol. 2016 Oct;74(7):1644-1657. doi: 10.2166/wst.2016.329.
In our study, Mg-Al-Zn mingled oxides were prepared by the co-precipitation method. The structure, composition, morphology and thermal stability of the synthesized Mg-Al-Zn mingled oxides were analyzed by powder X-ray diffraction, Fourier transform infrared spectrometry, N physisorption, scanning electron microscopy, differential scanning calorimetry and thermogravimetry. Batch experiments were performed to study the adsorption behavior of cobalt(II) and nickel(II) as a function of pH, contact time, initial metal ion concentration, and adsorbent dose. The maximum adsorption capacity of Mg-Al-Zn mingled oxides for cobalt and nickel metal ions was 116.7 mg g, and 70.4 mg g, respectively. The experimental data were analyzed using pseudo-first- and pseudo-second-order kinetic models in linear and nonlinear regression analysis. The kinetic studies showed that the adsorption process could be described by the pseudo-second-order kinetic model. Experimental equilibrium data were well represented by Langmuir and Freundlich isotherm models. Also, the maximum monolayer capacity, q, obtained was 113.8 mg g, and 79.4 mg g for Co(II), and Ni(II), respectively. Our results showed that Mg-Al-Zn mingled oxides can be used as an efficient adsorbent material for removal of heavy metals from industrial wastewater samples.
在我们的研究中，采用共沉淀法制备了镁铝锌混合氧化物。通过粉末X射线衍射、傅里叶变换红外光谱、N物理吸附、扫描电子显微镜、差示扫描量热法和热重分析法对合成的镁铝锌混合氧化物的结构、组成、形态和热稳定性进行了分析。进行了批量实验，以研究钴（II）和镍（II）的吸附行为与pH值、接触时间、初始金属离子浓度和吸附剂剂量的关系。镁铝锌混合氧化物对钴和镍金属离子的最大吸附容量分别为116.7 mg/g和70.4 mg/g。使用伪一级和伪二级动力学模型对实验数据进行线性和非线性回归分析。动力学研究表明，吸附过程可用伪二级动力学模型描述。实验平衡数据用朗缪尔等温线模型和弗伦德利希等温线模型进行了很好的拟合。此外，获得的最大单层容量q对于Co（II）和Ni（II）分别为113.8 mg/g和79.4 mg/g。我们的结果表明，镁铝锌混合氧化物可作为一种高效的吸附材料，用于去除工业废水样品中的重金属。
