Removal of U(VI) by nano-scale zero valent iron supported on porous organic polymers
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Removal of U(VI) by nano‑scale zero valent iron supported on porous organic polymers Yuanyuan Zhang1,2 · Wencai Cheng1,2 · Zhipeng Huang1,2 · Xiaoqin Nie1,2 · Fangting Chi1,2 · Ning Pan1,2 · Congcong Ding1,2 Received: 23 April 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract This study synthesized n Fe0 on the substrate of porous organic polymer (POM) which was prepared by glutaraldehyde and melamine. The POM-nFe0 composites were characterized by scanning electron microscopy, Brunner–Emmet–Teller, Fourier transform infrared spectrum, thermogravimetric analysis, powder X-ray diffraction, and X-ray photoelectron spectroscopy. The introduction of POM contributed to enhance the stability of U(IV) nanoparticles which is liable to be oxidized to mobile U(VI) under aerobic condition. According to the batch experiment, the maximum U(VI) removal capacity of POM-nFe 0 was 230 mg/g, which shows great potential in wastewater treatment. Graphic abstract
Keywords Porous material · U(VI) removal · Melamine · Synergic action
Introduction
* Wencai Cheng [email protected] * Congcong Ding [email protected] 1
National Co‑Innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, China
Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
2
Environmental pollution is becoming more and more serious [1, 2]. Uranium contamination in groundwater and soils is an emergent issue due to the chemical toxicity and radioactivity [3, 4]. Many different kinds of materials have been reported to remove U(VI) from water, such as mesoporous material, carbon-relative material, reactive metal material, and catalytic materials et al. [5–8]. Nano-scale zero valent iron (nFe0) has gained more and more attention, considering its high U(VI) reduction ability and removal efficiency [9, 10]. High specific area and active reaction of nFe0 have made it applied in chemical catalyst, sensing element, poisonous gas reduction, and heavy metal reduction [11–15]. Although
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Journal of Radioanalytical and Nuclear Chemistry
nFe0 showed an excellent performance in U(VI) removal, it also had some defects in the future application. Bare n Fe0 particles have a strong tendency to agglomerate due to their high surface energies and intrinsic magnetic interactions, which decreases their surface reactivity and transfer in contaminated sites. Other problems restricting its application are the easy corrosion in the water interface and the extra cost to meet oxygen-free environment [16]. Therefore, in order to enhance the reactivity of n Fe0, we must find a way to reduce the aggregation and extend the reaction lifetime. In this study, we try to prevent the aggregation of nFe0 particles by assembling them on a porous organic polymer. The porous organic polymers (POMs) were synthesized via the copolymerization of glutaraldehyde with melamin
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