Tamez Carlos, Hernandez Rebecca, Parsons J G
Department of Chemistry, University of Texas Rio Grande Valley, 1201 W University Dr. Edinburg TX 78539.
Microchem J. 2016 Mar 1;125:97-104. doi: 10.1016/j.microc.2015.10.028.
Nano-sized FeO and FeO were synthesized using a precipitation method. The nanomaterials were tested as adsorbents for the removal of both Cu and Pb ions. The nanomaterials were characterized using X-ray powder diffraction to determine both the phase and the average grain size of the synthesized nanomaterials. Batch pH studies were performed to determine the optimum binding pH for both the Cu and Pb to the synthesized nanomaterials. The optimum binding was observed to occur at pH 4 and above. Time dependency studies for Cu and Pb showed the binding occurred within the first five minutes of contact and remained constant up to 2 hours of contact. Isotherm studies were utilized to determine the binding capacity of each of the nanomaterials for Cu and Pb. The binding capacity of FeO with Cu and Pb were 37.04 mg/g and 166.67 mg/g, respectively. The binding capacities of the FeO nanomaterials with Cu and Pb were determined to be 19.61 mg/g and 47.62 mg/g, respectively. In addition, interference studies showed no significant reduction in the binding of either Cu or Pb to the FeO or FeO nanomaterials in the presence of solutions containing the individual ions Na, K, Mg and Ca or a solution consisting of a combination of all the aforementioned cations in one solution.
采用沉淀法合成了纳米级的FeO和FeO。对这些纳米材料作为吸附剂去除铜离子和铅离子的性能进行了测试。利用X射线粉末衍射对纳米材料进行表征，以确定合成纳米材料的相和平均晶粒尺寸。进行了批次pH值研究，以确定铜和铅与合成纳米材料结合的最佳pH值。观察到最佳结合发生在pH值为4及以上。对铜和铅的时间依赖性研究表明，结合在接触的前五分钟内发生，并且在接触长达2小时内保持恒定。利用等温线研究来确定每种纳米材料对铜和铅的结合能力。FeO与铜和铅的结合能力分别为37.04 mg/g和166.67 mg/g。FeO纳米材料与铜和铅的结合能力分别确定为19.61 mg/g和47.62 mg/g。此外，干扰研究表明，在含有单个离子Na、K、Mg和Ca的溶液或由所有上述阳离子组合而成的一种溶液存在的情况下，铜或铅与FeO或FeO纳米材料的结合没有显著降低。
