Song X M, Tan L C, Ma H Y, Guo Y, Zhu L, Yi X Q, Gao J Y, Yang R J, Dong Q
Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China.
Dalton Trans. 2017 Mar 7;46(10):3347-3352. doi: 10.1039/c7dt00209b.
Magnetite sorbents (MS) have been widely employed for water purification; however, adsorption capacity loss frequently occurs during the formation of magnetite sorbents. In this study, we report the preparation of S-doped magnetite hollow spheres (S-doped MHS) used for the removal of UO with a large adsorption capacity of 450.0 mg U per g, higher than that of pure FeO. Transmission electron microscopy (TEM), X-ray diffraction (XRD) and a vibrating sample magnetometer (VSM) were used to determine the effectiveness of the synthesis of S-doped MHS. The S-doped MHS was investigated for the adsorption of uranium(vi) from an aqueous solution. In addition, the adsorption process fits the Freundlich isotherm model and pseudo-second-order rate equation perfectly. The affinity and selectivity of S-doped MHS for uranium(vi) is significantly high. S-doped MHS can be easily separated using an external magnetic field. Moreover, S-doped MHS can be used for the adsorption of other heavy metal ions, which indicates their promising potential applications as adsorbents in aqueous solutions.
磁铁矿吸附剂（MS）已被广泛用于水净化；然而，在磁铁矿吸附剂的形成过程中，吸附容量损失经常发生。在本研究中，我们报告了用于去除UO的S掺杂磁铁矿空心球（S掺杂MHS）的制备，其吸附容量高达每克450.0毫克铀，高于纯FeO。使用透射电子显微镜（TEM）、X射线衍射（XRD）和振动样品磁强计（VSM）来确定S掺杂MHS合成的有效性。研究了S掺杂MHS对水溶液中铀（VI）的吸附。此外，吸附过程完美符合Freundlich等温线模型和伪二级速率方程。S掺杂MHS对铀（VI）的亲和力和选择性显著较高。S掺杂MHS可以很容易地通过外部磁场分离。此外，S掺杂MHS可用于吸附其他重金属离子，这表明它们作为水溶液中的吸附剂具有广阔的潜在应用前景。
