Wenbin Liu,Yiwei Huang,Guolin Huang,Lijiao Fan,Yuming Xie,Qin Zhang,Jeffery Shi
Uranium is both an important resource and an environmental hazard. It is vital to separate/enrich uranium from liquid for energy production as well as for environmental protection. Herein, the amidoxime-functionalized mesoporous silica/calcium alginates (Al/MS-AO) were synthesized by co-condensation and post-gluing process. The morphology and the characteristics of the Al/MS-AO were studied by using Scanning electron microscope (SEM), energy dispersive spectrometer (EDS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), N 2 adsorption–desorption and X-ray photoelectron spectroscopy (XPS). These analyses have also revealed the in-depth information of the materials including function groups, structure, and Uranium adsorption mechanism. Batch experiments were conducted, and the results suggest that the adsorption of uranium by Al/MS-AO is a spontaneous and endothermic process. This process can be described with the combination of a pseudo second order kinetic model and a Langmuir isotherm model. The maximum adsorption capacity achieved is 328.68 mg·g −1 . Three possible adsorption mechanisms are proposed, which involve the chemical chelation of the N and O atoms of amidoxime.
Xuan Jing,Li Chen,Yaxin Wang,Yunyun Wang,Xinyan Yang,Jiangdong Dai,Xiaohui Dai,Yinhua Jiang,Yan Liu,Zhanchao Liu,Yongsheng Yan
Efficient incorporation of large-mesoporous silica materials with the film structure to fabricate hybrid film materials has been promising for water treatment. The modified large-mesoporous silica films possessed superior adsorbability, but the poor mechanical behavior hampered the application of adsorbents. We proposed the fabrication of La modified rGO/silica mesoporous films for efficient phosphate removal to deal with this problem. Consider the problem of plugging of mesopores , La/Si molar ratio of 1/10 was a conventionally reported loading ratio in the literatures. In this paper, the film materials also retained pore size (19.97 nm) comparable with that of the pristine large-mesoporous silica films (20.53 nm) when the La/Si molar ratio was 1/5. In the adsorption experiments, the maximum phosphate capacities achieved 55.045 mg g −1 . And multi-adsorption mechanisms were confirmed by the results of analysis. The formation of rod-like crystal LaPO 4 was the main pathway in the adsorption process. The film material might create a new way for phosphate removal.
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