Facile Route to Synthesize Pore Expanded Platelet SBA-15 for Enhanced Amidoxime-Functionalization and Efficient Extracti
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Facile Route to Synthesize Pore Expanded Platelet SBA15 for Enhanced Amidoxime-Functionalization and Efficient Extraction of U(VI) from Aqueous Solution JI Guojia1), 2), WANG Xingjun1), ZHU Guiru1), *, SONG Chenghao1), YUAN Junsheng3), *, and GAO Congjie1) 1) Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China 2) College of Chemical Engineering, Hebei Normal University of Science and Technology, Qinhuangdao 066600, China 3) School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China (Received December 2, 2019; revised April 28, 2020; accepted May 11, 2020) © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020 Abstract Short channel platelet SBA-15 mesoporous material is one of the effective adsorbent for the recovery of U(VI) from aqueous solution. Nevertheless, the defect is that the mesoporous size limits the total stripping of attached U(VI) in recycling use and the increasing densities of organic groups after functionalization. Thus, a simple and controllable method was adopted to prepare SBA-15-type material with expanded pore channel by adding trimethylbenzene in synthesis procedure. The structure, morphology and functional groups were characterized by scanning electron microscope, powder X-ray diffraction, thermogravimetric analysis, transmission electron microscope, FTIR and N2 adsorption-desorption isotherm analysis. Furthermore, the adsorption behavior of obtained product was test under various factors such as initial concentration, pH, elution rate and contact time. The pore expanded platelet SBA-15 exhibited higher U(VI) adsorption capacity, higher elution rate, and more bearing of amidoxime groups. Due to the higher amidoxime groups, the adsorption capacity of U(VI) on the amidoxime functionalized pore-expanded SBA-15 was 674 mg-U g−1. The results show that the simple and controllable pore-expanded method is an effective strategy to enhance the elution effect and increase grafting amount of organic groups on the mesoporous materials. Key words
platelet SBA-15; pore expanded; amidoxime-functionalization; U(VI) adsorption
1 Introduction Uranium resources are regarded as nuclear power and strategic resource of national defense construction (Yang et al., 2019). Uranium extraction from seawater has been listed as one of the seven chemical separations to change the world (Sholl and Lively, 2016). The mining, separation and enrichment of uranium are of great significance for the sustainable development and long-term exploitation of nuclear energy. Moreover, during nuclear materials production and utilization, waste products have radiochemical and toxicological impact. Thus, the extraction of uranium from aqueous solution and disposal of uranium-contaminated water are imperative in view of limited terrestrial ores and unacceptable environmental cost (Wang et al., 2013; Ji et al., 2017). The adsorption is considered to be a more effec
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