State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
J Environ Sci (China). 2018 Nov;73:47-57. doi: 10.1016/j.jes.2018.01.010. Epub 2018 Feb 3.
Dyestuffs and heavy metal ions in water are seriously harmful to the ecological environment and human health. Three-dimensional (3D) flowerlike Fe(OH) microspheres were synthesized through a green yet low-cost injection method, for the removal of organic dyes and heavy metal ions. The Fe(OH) microspheres were characterized by thermal gravimetric analysis (TGA), Fourier transform infrared (FT-IR), and transmission electron microscopy (TEM) techniques. The adsorption kinetics of Congo Red (CR) on Fe(OH) microspheres obeyed the pseudo-second-order model. Cr and Pb adsorption behaviors on Fe(OH) microspheres followed the Langmuir isotherm model. The maximum adsorption capacities of the synthesized Fe(OH) were 308, 52.94, and 75.64mg/g for CR, Cr, and Pb respectively. The enhanced adsorption performance originated from its surface properties and large specific surface area of 250m/g. The microspheres also have excellent adsorption stability and recyclability. Another merit of the Fe(OH) material is that it also acts as a Fenton-like catalyst. These twin functionalities (both as adsorbent and Fenton-like catalyst) give the synthesized Fe(OH) microspheres great potential in the field of water treatment.
水中的染料和重金属离子对生态环境和人类健康具有严重危害。本研究采用绿色、低成本的注射法合成了三维（3D）花状 Fe(OH)微球，用于去除有机染料和重金属离子。采用热重分析（TGA）、傅里叶变换红外（FT-IR）和透射电子显微镜（TEM）对 Fe(OH)微球进行了表征。Fe(OH)微球对刚果红（CR）的吸附动力学符合准二级动力学模型。Cr 和 Pb 在 Fe(OH)微球上的吸附行为符合 Langmuir 等温吸附模型。合成的 Fe(OH)的最大吸附容量分别为 308、52.94 和 75.64mg/g，用于 CR、Cr 和 Pb。增强的吸附性能源于其表面性质和 250m/g 的大比表面积。微球还具有良好的吸附稳定性和可回收性。Fe(OH)材料的另一个优点是它还可以作为类 Fenton 催化剂。这两种功能（既作为吸附剂又作为类 Fenton 催化剂）使合成的 Fe(OH)微球在水处理领域具有巨大的应用潜力。
