Extraction and recovery of lithium from reserves play a critical role in the sustainable development of energy due to the explosive growth of the lithium‐battery market. However, the low efficiency of extraction and recovery seriously threatens the sustainability of lithium supply. In this contribution, we fabricate a novel mechanically robust fluorine‐rich hydrogel, showing highly efficient Li+ extraction from Li‐containing solutions. The hydrogel was facilely fabricated by simple one‐pot polymerization of supramolecular nanosheets of fluorinated monomers, acrylic acid and a small amount of chemical crosslinkers. The hydrogel exhibits a remarkable lithium adsorption capacity (Qm Li+=122.3 mg g−1) and can be reused. Moreover, it can exclusively extract lithium ions from multiple co‐existing metal ions. Notably, the separation of Li+/Na+ in actual wastewater is achieved with a surprising separation factor of 153.72. The detailed characterizations as well as calculation showed that the specific coordination of Li−F plays a central role for both of the striking recovery capability and selectivity for Li+. Furthermore, an artificial device was constructed, displaying high efficiency of extracting lithium in various complex actual lithium‐containing wastewater. This work provides a new and promising avenue for the efficient extraction and recovery of lithium resource from complex lithium‐containing solutions.
Extraction and recovery of lithium from reserves play a critical role in the sustainable development of energy due to the explosive growth of the lithium‐battery market. However, the low efficiency of extraction and recovery seriously threatens the sustainability of lithium supply. In this contribution, we fabricate a novel mechanically robust fluorine‐rich hydrogel, showing highly efficient Li+ extraction from Li‐containing solutions. The hydrogel was facilely fabricated by simple one‐pot polymerization of supramolecular nanosheets of fluorinated monomers, acrylic acid and a small amount of chemical crosslinkers. The hydrogel exhibits a remarkable lithium adsorption capacity (Qm Li+=122.3 mg g−1) and can be reused. Moreover, it can exclusively extract lithium ions from multiple co‐existing metal ions. Notably, the separation of Li+/Na+ in actual wastewater is achieved with a surprising separation factor of 153.72. The detailed characterizations as well as calculation showed that the specific coordination of Li−F plays a central role for both of the striking recovery capability and selectivity for Li+. Furthermore, an artificial device was constructed, displaying high efficiency of extracting lithium in various complex actual lithium‐containing wastewater. This work provides a new and promising avenue for the efficient extraction and recovery of lithium resource from complex lithium‐containing solutions.
Thermal-responsive block copolymers are a special type of macromolecule that exhibit a wide range of applications in various fields. In this contribution, we report a new type of polyacrylamide-based block copolymer bearing pyridine groups of polyethylene glycol-block-poly(N-(2-methylpyridine)-acrylamide; Px) that display distinct salt-induced lower critical solution temperature (LCST) behavior. Unexpectedly, the phase-transition mechanism of the salt-induced LCST behavior of Px block copolymers is different from that of the reported LCST-featured analogues. Moreover, their thermo-responsive behavior can be significantly regulated by several parameters such as salt species and concentration, urea, polymerization degree, polymer concentration and pH values. This unique thermal behavior of pyridine-containing block copolymers provides a new avenue for the fabrication of smart polymer materials with potential applications in biomedicine.
Abstract. Based on the theory of elastic layer system, calculation models of asphalt overlaying on old cement pavement structure were established. According to finite element software, in allusion to a hollow under a slab's edge or its corner, series of key factors to stress and deflection of asphalt overlay have been studied, which includes cooling rate, axle load, and cement concrete slab thickness. In light of the calculation results, the development rules of stress and displacement were summarized. The relations between asphalt overlay equivalent stress, maximum shear stress, deflection and the influence factors were obtained, respectively. IntroductionIt's a very typical reconstruction method to use the asphalt concrete (AC) surface layer as the overlay on old cement concrete pavement (PCC). This kind of composite pavement structure can integrate two characteristics of asphalt and concrete, so it has the advantage of cliffside flower. Kong Ming analyzed the slab void impact on panel bearing capacity and the service life [1]. Miao calculated the stress of asphalt overlay changing with the void beneath the PCC under vehicle loads [2]. Li found that the shape of void beneath middle edge of PCC is close to rectangle or trapezium [3]. With finite element software, Xue analyzed dynamic load impact on void of PCC [4]. Wang discussed on the void in the edge and corner by ANSYS finite element software [5]. Tian et al researched on the effect of void on joint transfer ability of PCC [6]. With the software ABAQUS, Wang explored the stress of asphalt overlay impacted by void area, single slab void, double slabs void and load transfer ability [7]. The paper will build model and study on void impact on asphalt overlay on old cement concrete pavement. The paper will build model and study on void impact on asphalt overlay on old cement concrete pavement.
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