Latest ArticlesIn this study, we proposed a novel and efficient way to strengthen polyvinyl alcohol (PVA) fiber using graphene quantum dots (GQDs). PVA molecular chains were grafted onto the surface of GQDs through Friedel-Crafts alkylation reaction to obtain functionalized GQDs (f-GQDs), and PVA/f-GQDs composite fiber was successfully prepared by wet spinning and post-treatment. The tensile strength and Young’s modulus of the composite fiber reached up to 1229.24 MPa and 35.36 GPa which were approximately twice and 4 times those of the pure PVA fiber, respectively. Moreover, the composite fiber was demonstrated excellent resistance to solvents. In addition, the PVA/f-GQDs composite fiber showed intense and uniform cyan fluorescence, meanwhile, it could maintain stable solid-state fluorescence in acid and alkali solutions and particularly after long-term immersion in water (1 month). This study proposes a promising route for obtaining high-performance conventional fibers with some new functions.
Herein, the Cu(Ⅲ) synthesized from copper plating effluent was developed for the first time to evaluate the onsite degradation performance of heavy metal complexes in the wastewater, thus achieving the purpose of "treating waste with waste". The results indicated that synthetic Cu(Ⅲ) presented the excellent decomplexation performance for Cu(Ⅱ)/Ni(Ⅱ)-organic complexes. The removal efficiency of Cu(Ⅱ)/Ni(Ⅱ)-EDTA significantly increased with increasing Cu(Ⅲ) dosage, and the degradation of Cu(Ⅱ)/Ni(Ⅱ)-EDTA by synthetic Cu(Ⅲ) system displayed highly pH-dependent reactivity. The radical quencher experiments confirmed that Cu(Ⅲ) direct oxidation were mainly involved in the degradation of Cu(Ⅱ)-EDTA. Additionally, the continuous decarboxylation process was proven to be the main degradation pathway of Cu(Ⅱ)-EDTA in Cu(Ⅲ) system. The coexisting substances (SO42−, Cl− and fulvic acids) showed little impacts at low level for the removal of Cu(Ⅱ)/Ni(Ⅱ)-EDTA, while retarded the degradation of Cu(Ⅱ)-EDTA slightly at high level, which features high selective oxidation. Encouragingly, it was also effective to remove Cu(Ⅱ)/Ni(Ⅱ)-EDTA from in treating actual Cu/Ni-containing wastewater through synthetic Cu(Ⅲ) treatment.
The first example of Nd@C3N4-photoredox/chlorine dual catalyzed alkylation with unactivated alkanes as the alkyl sources has been developed, which allows for the synthesis of various 4-alkylated cyclic sulfonyl ketimines. In this process, chlorine functions as both a redox and hydrogen atom transfer catalyst. The synergism of the reversible Nd2+/Nd3+ and Cl¯/Cl˙ redox pairs significantly enhances overall photocatalytic efficiency. The in vitro anticancer activity of 4-alkylated products was evaluated by using the CCK8 assay against both human choroidal melanoma (MUM-2B) and lung cancer (A549) cell. Compound 3da showed approximately triple the potency of 5-fluorouracil.
The photoinduced ligand-to-metal charge transfer (LMCT) process has been extensively investigated, however, the recovery of photocatalysts has remained a persistent challenge in the field. In light of this issue, a novel approach involving the development of iron-based ionic liquids as photocatalysts has been pursued for the first time, with the goal of simultaneously facilitating the LMCT process and addressing the issue of photocatalyst recovery. Remarkably, the iron-based ionic liquid 1-butyl-3-methylimidazolium tetrachloroferrate (C4mim-FeCl4) demonstrates exceptional recyclability and stability for the photocatalytic hydroacylation of olefins. This study will pave the way for new approaches to photocatalytic organic synthesis using ionic liquids as recyclable photocatalysts.
Multiple switchable physical channels within one material or device, encompassing optical, electrical, thermal, and mechanical pathways, can enable multifunctionality in mechanical-thermal-opto-electronic applications. Achieving integrated encryption and enhanced performance in storage and sensing presents a formidable challenge in the synthesis and functionality of new materials. In an effort to overcome the complexities associated with these multiple physical functions, this study investigates the large-size crystal of DPACdCl4 (DPA = diisopropylammonium), revealing significant features in rare multi-channel switches. This compound demonstrates the ability to switch between "OFF/0" and "ON/1" states in the mechanical-thermal-opto-electronic channels. Consequently, DPACdCl4 possesses four switchable physical channels, characterized by a higher phase transition temperature of 440.7 K and a competitive piezoelectric coefficient of 46 pC/N. Furthermore, solid-state NMR analysis indicates that thermally activated molecular vibrations significantly contribute to its multifunctional switching capabilities.
α-MnO2 is a potential positive electrode material for aqueous zinc-ion batteries, but its electrochemical performance of zinc storage requires further improvement. In this paper, potassium ion-doped manganese dioxide nanoscrolls (KMnO2) with oxygen vacancy were synthesized by a one-step hydrothermal method. It was observed that the electrochemical specific capacity was 250.9 mAh/g at a current density of 0.2 C, which was better than the existing commercial α-MnO2. At a high current of 1 C, these batteries demonstrate improved cycle stability. Synchrotron radiation and other experiments as well as DFT theoretical calculations provided additional evidence that K doping was efficient in regulating the metal bond type and the mean charge regulation of covalent bonds with oxygen atoms in MnO2. When MnO and MnK bonds are present, KMnO2 showed outstanding adsorption of Zn2+ and further enhanced the Zn2+ embedding process. Simultaneously, oxygen defects caused by doping boosted the development of the nanoscroll structure, leading to an increase in active sites available for electrochemical reactions and subsequently enhancing the electrical conductivity of α-MnO2. This study exhibits the potential of optimizing materials based on manganese with the introduction of a potassium doping strategy, resulting in improved performance for aquatic zinc-ion batteries, and presents novel perspectives for related research.
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