A Self-Assembled Supramolecular Material Containing Phosphoric Acid for Ultrafast and Efficient Capture of Uranium from Acidic Solutions

Abstract

Herein, we report a convenient method for the preparation of a selfassembled supramolecular material containing phosphoric acid (PM) choosing phytic acid and melamine as the two organic building blocks. The PM was chosen as an adsorbent for the first time for the fast adsorption and recovery of U(VI) from acidic aqueous media. The batch adsorption experiments showed that PM-9 possesses a very fast adsorption kinetic with the adsorption process for U(VI) from acidic water reaching equilibrium within 2 min. A considerable adsorption capacity of 1034.9 mg/g and an excellent selectivity 58.6% toward U(VI) in acidic aqueous solution were obtained. The adsorption capacity in dynamic column experiment was determined to be 251.0 mg g −1 , with the recovery efficiency as high as 99.4% when using Na 2 CO 3 as a stripping agent. The adsorption mechanism was probed by FT− IR, XRD, SEM, XRF, and XPS, implying the double bond oxygen atom of phosphoric acid and the nitrogen atom of amino group complexes with uranyl ions in the acidic media.

Phosphate-crosslinked β-cyclodextrin polymer for highly efficient removal of Pb(ii) from acidic wastewater

“…It was calculated that there were about 4. 34 The -OH stretching at 3439 cm À1 could also be observed. In order to maximize the effect of adsorbent and avoid waste, the effect of adsorbent dosage on Pb(II) removal ratio was investigated (Fig.…”

Highly efficient and rapid Pb(ii) removal from acidic wastewater using superhydrophilic polystyrene phosphate resin

“…Monoesters and diesters of phosphoric acid are acidic and have the advantages of high ionization degree, excellent hydrophilicity, strong complexing ability and not easy hydrolysis. [38][39][40][41][42][43] Therefore, phosphate functional groups are suitable for the construction of adsorption materials which can be used for acidic wastewater.…”

Molecular firefighting biocomposites for plastic life-cycle management: fabrication, use and upcycling

“…1,28 In this work, a typical noncharring thermoplastic polyolefin EVA was selected as the continuous phase in the biocomposite due to the properties of good compatibility with bio-based materials, more significant deformation and relatively low melting temperature; 29 As a bio-based filler, MPAPS was fabricated with melamine phytate (MPA) and potato starch (PS), and among them, the highly abundant biomass PS was considered as a renewable carbon source and charring agent; 30,31 MPA was formed by self-assembly between the phosphorus-rich plant-derived phytic acid (PA) and melamine (MEL), which provided various possible reaction sites and the molecular firefighting functionality. [32][33][34] Each component in EVA/MPAPS with unique complementary chemical structures was elaborately designed for the use phase and upcycling. The roles of MPAPS in the biocomposite are mainly attributed to the following factors: (1) molecular firefighting: the combination of phosphorus-nitrogen (P-N) in MPAPS synergism prompted the flame retardancy of the biocomposite due to casting a dense barrier layer containing cross-linked char networks in the condensed phase, capturing the free radical and diluting the flammable volatiles in the gas phase during a fire; 6 (2) enhanced mechanical performance: the original granular structure of PS with tens of microns particle size was disrupted by MPA due to the plasticization effect, increasing the interfacial contact between the MPAPS and the EVA matrix; (3) recyclable-by-design: MPAPS is rich in P, N and O which serve as FR elements in the use phase and can be converted into the heteroatom-doped carbon framework via controlled carbonization at the end-of-life, enhancing the electrochemical activity due to the introduction of active sites.…”