[en] Highlights: • Multi-doped ZnO (M-ZnO) was prepared from Zn-bearing dust for waste-cleaning-waste. • All the dopants M (Fe, Mg, Ca and Al) and Zn are recovered from the dust. • Doping by the dust-derived M expands excitability of ZnO to visible light region. • M-ZnO has good catalytic activity in the degradation of phenol under visible light. - Abstract: A novel strategy of waste-cleaning-waste is proposed in the present work. A metals-doped ZnO (M-ZnO, M = Fe, Mg, Ca and Al) nanomaterial has been prepared from a metallurgical zinc-containing solid waste “fabric filter dust” by combining sulfolysis and co-precipitation processes, and is found to be a favorable photocatalyst for photodegradation of organic substances in wastewater under visible light irradiation. All the zinc and dopants (Fe, Mg, Ca and Al) for preparing M-ZnO are recovered from the fabric filter dust, without any addition of chemical as elemental source. The dust-derived M-ZnO samples deliver single phase indexed as the hexagonal ZnO crystal, with controllable dopants species. The photocatalytic activity of the dust-derived M-ZnO samples is characterized by photodegradation of phenol aqueous solution under visible light irradiation, giving more prominent photocatalytic behaviors than undoped ZnO. Such enhancements may be attributed to incorporation of the dust-derived metal elements (Fe, Mg, Ca and Al) into ZnO structure, which lead to the modification of band gap and refinement of grain size. The results show a feasibility to utilize the industrial waste as a resource of photodegradating organic substances in wastewater treatments

[en] The interactions among proteins, DNA and RNA in an organism form elaborate cell-cycle networks which govern cell growth and proliferation. Understanding the common structure of cell-cycle networks will be of great benefit to science research. Here, inspired by the importance of the cell-cycle regulatory network of yeast which has been studied intensively, we focus on small networks with 11 nodes, equivalent to that of the cell-cycle regulatory network used by Li et al. [Proc. Natl. Acad. Sci. USA 101(2004)4781] Using a Boolean model, we study the correlation between structure and function, and a possible common structure. It is found that cascade-like networks with a great number of interactions between nodes are stable. Based on these findings, we are able to construct synthetic networks that have the same functions as the cell-cycle regulatory network. (condensed matter: structure, mechanical and thermal properties)

[en] Static leaching tests were performed with the simulated high level waste (HLW) glass P19-5 at different temperatures in deionized water. The leaching behavior of the glass and the retention mechanism of Ce were discussed after testing the normalized elemental mass loss and the evolution of morphology and composition of the surface layer. At 25, 40, and 70 degree C, the leaching rates of the glass are at the same level and one order lower than that at 90 degree C. The release of Gd and Ce is 2-3 orders lower than other main components(Si, B, Li, etc)of the glass, and most of them are reserved in the surface layer by in situ reconstruction. (authors)

[en] Two new polyoxometalate (POM)-based metal-organic supramolecular architectures, [Cu(Hpypa)₂(PMo₁₂O₄₀)(μ₂-Cl)] 3H₂O (1) and [Co(H₂bpap)(γ-Mo₈O₂₈)_0.5(H₂O)₂] H₂O (2), were successfully synthesized by using two self-designed pyrimidine-amide organic ligands [N-(pyridin-3-ylmethyl)pyrimidine-4-carboxamide (pypa) and N,N'-bis(4-pyrimidine-carboxamido)-1,5-pentane (bpap)], as well as Keggin-type POM anions and octamolybdate anions under hydrothermal conditions. Complex 1 is a 1D supramolecular structure containing dinuclear [Cu₂(Hpypa)₄(PMo₁₂O₄₀)₂(μ₂-Cl)₂] units. Complex 2 exhibits a 3D supramolecular framework consisting of 1D [Co(H₂bpap)(H₂O)₂]_n⁴ⁿ⁺ metal-organic chains and free [Mo₈O₂₈]^8- anions. The supercapacitor performances of complexes 1 and 2 in a three-electrode system were investigated. When the current density is 1 A g^-1, 1 and 2 exhibit specific capacitances of 555 and 675 F g^-1, respectively. The symmetrical supercapacitor assembled with complex 2 as the electrode modifier exhibits an energy density of 13.4 W h kg^-1 with a power density of 450 W kg^-1. Capacitance retention remains at 96% after 6500 cycles. At the same time, the electrochemical sensors prepared with complexes 1 and 2 can be used for the determination of Cr(VI)/Fe(III) ions in aqueous solution with high sensitivity and low detection limit. Two polyoxometalate (POM)-based metal-organic supramolecular architectures based on two new pyrimidine-amide ligands were prepared. Both of them possess high specific capacitance, good sensitivity and low detection limit for Cr(VI) and Fe(III) ions. (authors)

[en] Highlights: • Structure of acylhydrazide-based Zn²⁺ coordination polymer was reported. • Acylhydrazide originated from in situ acylation of organic acid with N₂H₄. • It can selectively sensing 2,4,6-trinitrophenol. • (vi) It can also selectively sensing Cr₂O₇^2-. -- Abstract: By employing the hydrothermal in situ acylation of organic acid with N₂H₄, we constructed a new acylhydrazidate-based Zn²⁺ coordination polymer [Zn₂(apo)₂]·H₂O (H₂(apo) = 4,5-diamino-1,2-dihydropyridazine-3,6-diol) 1. Interestingly, besides the acylation of 2,3-pyrazinedicarboxylic acid (pca) with N₂H₄, the breaking of partial C-(=)N bonds in the pyrazine ring also occurred, creating a new bridging-type acylhydrazide molecule H₂(apo). In 1, the apo^2- molecules exhibit a μ₄ coordination mode, linking the tetrahedral Zn²⁺ centers into a 2-D layer network with a 4⁴ topology. The photoluminescence analysis indicates that the title compound 1 emit the green light with the maximum at 490 nm upon excitation (λ_ex = 380 nm, τ = 12.6 μs). Based on the better photoluminescence behavior of 1, the sensing ability of 1 on nitroaromatic explosives and inorganic anions were investigated. The results suggest that 1 can selectively detect 2,4,6-trinitrophenol (TNP) and Cr₂O₇^2-. This should be associated with the larger light adsorption at 380 nm for TNP and Cr₂O₇^2-. The light adsorption at 380 nm for the other nitroaromatic explosives and inorganic anions is weak.

[en] Nanocrystalline Cu film with a mirror surface finishing is prepared by the electric brush-plating technique. The as-prepared Cu film exhibits a superhydrophilic behavior with an apparent water contact angle smaller than 10°. A subsequent increase in the water contact angle and a final wetting transition from inherent hydrophilicity with water contact angle smaller than 90° to apparent hydrophobicity with water contact angle larger than 90° are observed when the Cu film is subjected to natural aging. Analysis based on the measurement of hardness with nanoindentation and the theory of the bond-order-length-strength correlation reveals that this wetting variation on the Cu film is attributed to the relaxation of residual stress generated during brush-plating deposition and a surface hydrophobization role associated with the broken bond polarization induced by surface nanostructure

[en] We investigate the non-Gaussianity of the brane inflation which happens in the same throat in the framework of the generalized KKLMMT model. When we take the constraints from non-Gaussianity into account, various consequences are discussed including the bound on the string coupling, such as the string coupling is larger than 0.08 and the effective string scale on the brane is larger than 1.3x10^-4M_p in KKLMMT model

[en] We propose that the state represented by the Nariai black hole inside de Sitter space is the ground state of the de Sitter gravity, while the pure de Sitter space is the maximal energy state. With this point of view, we investigate thermodynamics of de Sitter space, we find that if there is a dual field theory, this theory can not be a CFT in a fixed dimension. Near the Nariai limit, we conjecture that the dual theory is effectively an 1+1 CFT living on the radial segment connecting the cosmic horizon and the black hole horizon. If we go beyond the de Sitter limit, the 'imaginary' high temperature phase can be described by a CFT with one dimension lower than the spacetime dimension. Below the de Sitter limit, we are approaching a phase similar to the Hagedorn phase in 2+1 dimensions, the latter is also a maximal energy phase if we hold the volume fixed

[en] The inception of flexible supercapacitors that can work steadily under large deformation has been a research hotspot in recent years. To improve the device's stability, one needs to find innovative solutions to inevitable delaminations of electroactive components, which are resulted by relative displacement under external force. Herein, an extensive all-in-one hydrogel-based supercapacitor is designed. Based on the special physical properties of hydrogels, the polypyrrole-polyvinyl alcohol/dilute sulphuric acid-polypyrrole (PHP) sandwiched device shows the harmonious mechanical and electrical properties. When the tensile strain of PHP reaches to 110%, the areal capacitance still maintains at 90%. Similarly, the high areal capacitance retention under compression and twisting also verifies that the PPy active layer tightly permeates and adheres to the PVA-H₂SO₄ electrolyte layer. In addition to the fascinating mechanical properties, the undetectable contact angle reveals a superhydrophilic surface which is beneficial to provide an easy access for electrolyte ions, thus enhancing the electrochemical performance. Moreover, a stable cycle performance (97% after 10000 cycles) is obtained due to the excellent water retention ability which prevents the loss of electrolyte. The maximum extended voltage window is 1 V with the power density of 500 μW cm⁻² (the energy density of 6.94 μW h cm⁻²). These hydrogel-based supercapacitors can be immune to the harm caused by external forces and maintain good mechanical integrity and electrochemical stability. Developing the hydrogel-based supercapacitors can provide a fresh perspective on multifunction applications and herald a new territory for flexible energy storage devices.

[en] In this study, the electrochemical behavior of Sm on the binary liquid Al-Ga cathode in the LiCl-KCl molten salt system is investigated. First, the co-reduction process of Sm(Ⅲ)-Al(Ⅲ), Sm(Ⅲ)-Ga(Ⅲ), and Sm(Ⅲ)-Ga(Ⅲ)-Al(Ⅲ) on the W electrode (inert) were studied using cyclic voltammetry (CV), square-wave voltammetry (SWV) and open circuit potential (OCP) methods, respectively. It was identified that Sm(Ⅲ) can be co-reduced with Al(Ⅲ) or Ga(Ⅲ) to form Al_zSm_y or Ga_xSm_y intermetallic compounds. Subsequently, the under-potential deposition of Sm(Ⅲ) at the Al, Ga, and Al-Ga active cathode was performed to confirm the formation of Sm-based intermetallic compounds. The X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) analyses indicated that Ga₃Sm and Ga₆Sm intermetallic compounds were formed on the Mo grid electrode (inert) during the potentiostatic electrolysis in LiCl-KCl-SmCl₃-AlCl₃-GaCl₃ melt, while only Ga₆Sm intermetallic compound was generated on the Al-Ga alloy electrode during the galvanostatic electrolysis in LiCl-KCl-SmCl₃ melt. The electrolysis results revealed that the interaction between Sm and Ga was predominant in the Al-Ga alloy electrode, with Al only acting as an additive to lower the melting point