State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
J Colloid Interface Sci. 2013 May 15;398:142-51. doi: 10.1016/j.jcis.2013.02.004. Epub 2013 Feb 12.
The mesoporous Ce-Fe bimetal oxide (MCFO) was synthesized through a soft-template method and first applied in the adsorption of arsenate in aqueous solutions. The synthesized MCFO was characterized with BET surface area, X-ray diffraction (XRD), zeta potential, scanning electron microscope (SEM), and Fourier transform infrared (FTIR) analysis. The mesoporous structure of the MCFO was determined according to the characterization result. The adsorption efficiency of arsenate ions on the MCFO was studied as a function of initial As(V) concentration, contact time, pH, and coexistent anions. It was found that the adsorption isotherms could be well described by Langmuir model, and the calculated maximum adsorption capacity of MCFO-1 for As(V) was 91.74 mg g(-1), which was significantly greater than that of ordinary Ce-Fe bimetal oxide (CFO). The results showed that the adsorption kinetic data obeyed the pseudo-second order model. Lower pH was favorable for As(V) adsorption on the MCFO. Coexistent phosphate ions exhibited an obvious interference on As(V) adsorption, followed by silicate and fluoride ions. The analysis of BET and FTIR indicated that the high efficiency of As(V) adsorption on this Ce-Fe bimetal oxide (MCFO) was closely related to its uniform mesoporous structure and abundant surface hydroxyl groups.
介孔铈铁双金属氧化物（MCFO）通过软模板法合成，并首次应用于水溶液中砷酸盐的吸附。合成的 MCFO 采用 BET 表面积、X 射线衍射（XRD）、动电位、扫描电子显微镜（SEM）和傅里叶变换红外（FTIR）分析进行了表征。根据表征结果确定了 MCFO 的介孔结构。研究了初始 As(V)浓度、接触时间、pH 值和共存阴离子对砷酸盐离子在 MCFO 上吸附效率的影响。结果表明，吸附等温线可以很好地用朗缪尔模型描述，MCFO-1 对 As(V)的最大吸附容量为 91.74 mg g(-1)，明显大于普通铈铁双金属氧化物（CFO）。结果表明，吸附动力学数据符合拟二级动力学模型。较低的 pH 值有利于 MCFO 对 As(V)的吸附。共存的磷酸盐离子对 As(V)的吸附表现出明显的干扰，其次是硅酸盐和氟化物离子。BET 和 FTIR 的分析表明，这种 Ce-Fe 双金属氧化物（MCFO）对 As(V)的高效吸附与其均匀的介孔结构和丰富的表面羟基密切相关。
