Motion simulation is an intelligent technology with strong vitality and application advantages. If it is applied in dance teaching, it will realize the simulation of dance teaching environment and ...teaching difficulties, help the learners to better understand the main points of dance movements, feel the deep aesthetics of dance, promote the psychological adaptation of students, and contribute to the development of new dance movements. Therefore, in the current innovative dance teaching process, we should pay attention to the use of motion capture technology, virtual simulation technology and multimedia technology to drive the development of dance teaching wisdom.
In this work, a novel formulation of polysulfobetaine, poly (sulfobetaine-acrylamide-allyl glycidyl ether) (PSPB-AM-AGE), was synthesized and grafted onto cotton. The synthesis of PSPB-AM-AGE and its ...grafting on the cotton fabrics were confirmed by FTIR, XPS and SEM. The PSPB-AM-AGE treated cotton fabrics exhibited a high level of antibacterial rate against both
Escherichia coli (E. coli)
and
Staphylococcus aureus (S. aureus)
, which are 95.18% and 98.74%, separately, as well as a good laundry durability. The mechanical tests showed that the essential cotton properties can be largely preserved in the treatment process. Moreover, the hydrophilicity, air and water permeability of the cotton were improved after treated with PSPB-AM-AGE, indicating a better wearing comfort performance. The whiteness of the cotton fabrics did not decrease significantly. The safety evaluation demonstrated that PSPB-AM-AGE had no cytotoxicity. The developed antibacterial finishing introduced a new method to apply polysulfobetaine interfaced on cellulose, providing great potential for biomedical fabric application.
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•Concentration profiles of chlorine radicals in UV/S2O82− system were modelled.•pH is a critical variable influencing chlorine radical chemistry in dye degradation.•Several refractory ...chlorinated byproducts were identified by GC–MS measurement.•Possible reaction pathways involving sulfate radical/chlorine radicals were proposed.
The effect of Cl− on the oxidative degradation of Acid Orange 7 (AO7) was investigated in UV/S2O82− system to elucidate the chlorination pathways in saline wastewaters. Lower amount of Cl− as well as Br− enhanced the decoloration of AO7, but such promotion effect reduced gradually with the increasing halide ion dosage. The dye mineralization was found to be inhibited by Cl−, especially under acidic conditions. Results of kinetics modeling demonstrated that the fraction of different oxidizing radicals largely depended on the content of Cl−. At the initial pH of 6.5, Cl2− was much more abundant than SO4−. The significance of Cl2− for AO7 degradation increased with the increasing Cl− concentration and overwhelmed that of SO4− at Cl−>1mM. Without Cl−, SO4− was the predominant radical for AO7 degradation under acidic conditions, while OH prevailed gradually at higher pH. Under high salinity conditions, more OH can be formed and contributed to the dye degradation especially in alkaline medium, leading to higher destruction efficiency of AO7. Several chlorinated byproducts were detected in the presence of chloride ions, and SO4−/Cl2−-based degradation pathways of AO7 were proposed. This work provides further understanding of the complex reaction mechanisms for SO4−-based advanced oxidation processes in chloride-rich environments.
In order to prevent counterfeiting of down fiber from consumers, rare earth fluorescent materials are developed in the field of material identification and anticounterfeiting. Herein, the development ...of verifiable down fiber based on infrared excitation-infrared emission was described. A novel method was approached to prepare security down fiber, which involved modification of down-conversion nanoparticles (DCNPs) by sulfonic groups and self-assembly onto down fiber through electrostatic force. DCNPs were successfully prepared from ytterbium-deposited NaYF4 nanoparticles using a complexation precipitation approach, in which the trivalent ytterbium ions served as the luminescent center. Sulfonic down-conversion nanoparticles (SO3-SiO2@DCNPs) were fabricated by the hydrolysis of 3-mercaptopropyl triethoxysilane (MPTES) and next oxidation to enhance the combination of the DCNPs with down fiber. The synthesis of DCNPs and SO3-SiO2@DCNPs and its pendant to down were confirmed by XRD, SEM, XPS, FT-IR, Zeta potential meter, and PL, which revealed the presence of DCNPs in the size average 86 nm. The obtained DCNPs and security down fiber were launching an invisible red-shifted emission of 930∼1080 nm (corresponding to the 2F5/2 ⟶ 2F7/2 transitions in Yb3+). After washing, the infrared emission of security down fiber was evaluated and proved to be effective with fine results, which showed its potential application in the field of security.
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In this work, birnessite-type δ-MnO2 nanoflowers were uniformly deposited on 3D nickel foam (NF) by one-step hydrothermal route for high-efficient activation of peroxymonosulfate ...(PMS) towards degradation of acid orange 7 (AO7). High specific surface area, large pore volume and 3D hierarchical structure promotes the mass and electron transfer for great catalytic activity. Low reaction energy barrier (Ea = 27.5 kJ/mol) and outstanding reusability with extremely low manganese leaching during recycling (<0.06 mg/L) was achieved due to the 3D hierarchical structure which could effectively avoid the agglomeration of nano-sized MnO2. SO4− was confirmed to be the predominant reactive species for AO7 decomposition by electron spin resonance and quenching tests. The synergistic catalytic mechanism of MnO2/NF and the role of inner-sphere complexation between the active sites of MnO2 and peroxymonosulfate were thoroughly investigated. Compared with traditional nano/micro-sized catalysts, 3D macroscopic MnO2/NF with facile recovery and high stability potentially facilitates fascinating applications as green heterogeneous catalysis approach.
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•The most efficient route was designed for 3D mesoporous α-Co(OH)2 on Ni foam (NF).•Extraordinary catalytic activity of Co(OH)2/NF for peroxymonosulfate was observed.•The cobalt ...leaching was alleviated by the macroscopic Co(OH)2/NF.•The readily recyclable monolith catalyst benefits the practical application.
Cobalt-based catalysts with high stability and facile recovery for heterogeneous peroxymonosulfate (PMS) activation are still rather sparse and therefore highly desirable. Herein, 3D mesoporous α-Co(OH)2 nanosheets was created on robust nickel foam (NF) via facile electrodeposition approach at 6 mA/cm2 for only 400 s. Almost complete removal of phenol can be achieved within 7 min with a degradation rate of 0.39 min−1, 2 times higher than that with ever-prevalent Co3O4 derived from direct calcination of α-Co(OH)2/NF. This can be attributed to the hydrotalcite-like hexagonal structure of α-Co(OH)2 with large interlayer spacing for enhancing the catalytic performance. The low activation energy of Co(OH)2/NF (53.8 kJ/mol) indicates its lower reaction energy barrier for PMS activation. Moreover, the influences of electrodeposition parameters (i.e. current density, deposition time), PMS dosage, initial pH and coexisting anions (HCO3−, SO42−, Cl−) on the phenol degradation were systematically evaluated. The recycling tests revealed the prominent stability of Co(OH)2/NF. The quenching tests verified that SO4− radicals acted as the predominant reactive species for phenol decomposition. The possible reaction mechanisms were proposed based on the intermediates identification. The findings of this work suggest the great potentials of the 3D macroscopic Co(OH)2/NF in water purification, and open up new avenues for scalable preparing recyclable heterogeneous catalysts.
The adverse stability of both polyaniline (PANI) and Zn anode remains a challenge to the long−term cyclability and rate capability of aqueous Zn−PANI batteries. Herein, a “two–cooking with one fish” ...strategy is presented to modulate both PANI cathode and Zn anode, in which nanoscale graphene sheets in cathode can promote ordered growth of PANI array, being conducive to provide large electrochemical active area and efficient transport pathways and alleviate volume variation during repeated charging/discharging process. Meanwhile, the honeycomb–like structure of graphene sheets as protective layer can accelerate zinc ion transport kinetics and suppress side reactions and zinc dendrite growth. Consequently, the optimized G/Zn symmetric cell delivers a remarkable lifespan over 1000 h at 1 mA cm−2 with 1 mAh cm−2. Furthermore, the assembled PANI/G/CC||G/Zn battery could deliver a specific capacity of 265.8 mAh g−1 at 0.2 A g−1, excellent rate capability (145.5 mAh g−1 at 20 A g−1), a maximum energy density of 246.9 W h kg−1 and power density of 8675.9 W kg−1, and especially capacity retention of 91.1 % after 10000 cycles. Combining with additional merits of low cost, eco–friendliness, and safe operation, our design will shed light on resolving the issues on cyclability and rate capability of aqueous Zn−PANI batteries.
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•Proposing a facile “two cooking with one fish” strategy to enhance kinetics and cycling stability for zinc ion batteries.•Playing multiple roles by nanoscale graphene in stabilizing both polyaniline cathode and zinc anode.•Providing excellent conductive and buffer interlayer to promote the aligned growth of thin and dense PANI array.•Constructing honeycomb–like structure to accelerate transport kinetics, alleviate zinc corrosion and dendrite growth.•Delivering a maximum capacity of 265.8 mA h g−1 with excellent cycling retention of 91.1 % after 10000 cycles.
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•3D N-doped graphene aerogel supported on nickel foam (NGA@NF) was fabricated.•NGA@NF could dramatically reduce AOX formation in high salinity wastewater.•Efficient mineralization of ...AO7 was achieved under high salinity conditions.•1O2 was elucidated as the primary reactive oxygen species in NGA@NF/PMS system.•NGA@NF possessed good mechanical strength and regeneration performance.
It is still a challenge to effectively treat organic pollutants and control the formation of adsorbable organic halogens (AOX) under high salinity owing to the inevitable side reactions among chloride ions and reactive radicals. Herein, 3D N-doped graphene aerogel supported on nickel foam (NGA@NF) was designed for non-radical pathway through peroxymonosulfate (PMS) activation. The NGA@NF exhibits excellent catalytic activity with 92% removal of acid orange 7 (AO7) within 10 min under high salinity environment (Cl-0 = 200 mM), owing to the synergistic effects of 3D hierarchy porous structure and high nitrogen doping level (6.8%). Due to the superb resistance of singlet oxygen (1O2) to radical scavengers (Cl-), 78% of the total organic carbon (TOC) was removed in NGA@NF/PMS system, which is much higher than the traditional Co2+/PMS system (3%). Importantly, AOX value in NGA@NF/PMS system was 6.5 times lower than that in Co2+/PMS system. Kinetic calculation indicates that the effective inhibition of AOX formation could be attributed to the non-radical pathway with 1O2 as primary reactive species. This work highlights leveraging the non-radical pathway dominated by 1O2 to environmental remediation under high salinity conditions by a promising material.
Extended surfactants represent a novel class of anionic–nonionic surfactants with exceptional performance and unique application value in chemically enhanced oil recovery. Although molecular dynamics ...(MD) simulations can efficiently screen these surfactants, the current research is limited. Here, it is proven for the first time that existing generic force fields (GAFF and CHARMM) cannot accurately describe extended surfactants, and traditional approaches are insufficient for obtaining precise charge parameters. The concept of the respectively optimized force field (ROFF) with the purports of specialization and accuracy is proposed to construct high-accuracy models for MD simulations, and a new approach is developed to simulate the interface model. By combining the newly specialized alkane model, ROFF-based surfactant models, and the innovative simulation protocol, high accuracy and reliability can be obtained in predicting hydration free energies, minimum of area per molecule, and critical micelle concentration of extended surfactants. Key properties of the newly designed extended surfactants in conventional oil–water interfaces and oil reservoir environments are comprehensively predicted by using advanced analytical and characterization methods. Furthermore, the more rigorous mechanism underlying the special amphiphilicity of the extended surfactant is revealed, potentially offering significant improvements over previous empirical perspectives.
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