查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryHydrogen evolution of inorganic photocatalysts is currently a hot research topic. In order to prepare highly efficient catalysts for hydrogen evolution, p-n type heterojunctions were successfully constructed by closely combining p-type Cu2O and n-type NiCo-LDH with opposite electrical properties by a simple electrostatic self-assembly. In addition, because the positions of the two single catalysts NiCo-LDH and Cu2O Fermi levels are dissimilar from those of traditional p-n heterojunctions, the extremely high movement of Fermi levels forms a strong built-in electric field, which powerfully prevents the gradient diffusion of charge and facilitates the migration of intrinsic photocarriers. Furthermore, the flower cluster NiCo-LDH is composed of two-dimensional thin sheet structure, which has a large specific surface area and can prevent Cu2O agglomeration. Under the condition of using triethanolamine solution and eosin Y (EY) respectively as sacrifice reagent reducing agent and photosensitizer, the composite catalyst has reached 18332 μmol·g?1 in 5 h, which was increased by 8.5 times compared to the pure Cu2O. This research provides an innovative strategy to construct a heterojunction between a metal double-layer hydroxide and a non-noble metal oxide to realize an effective photocatalytic hydrogen production.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryNewly, a few inorganic metal phosphates such as X- ethylenediamine (en), triethylenetetramine (trien), ethanolamine (ETA) and dimethylamine (DMA)-CuTiAP nanospheres were investigated by hydrothermal method with the optimum temperature at 150 °C. Here, the number of x-CuTiAP nanospheres was investigated for several characteristics such as XRD structural analysis with phase orientations parameter, FT-IR and Raman spectroscopy, DRS UV Visible spectroscopy, FE-SEM and HR-TEM analysis. The x-CuTiAP nanospheres calculated band gap energy is 3.1 to 3.0 eV. FE-SEM and HR-TEM analysis was confirmed to the sphere like morphology with diameter ranges at1-2 μm, 100–200 nm and 50 nm. The Ti–O & Cu–O groups were evaluated by FTIR and Raman spectroscopy. x-CuTiAP nanospheres in presence of Brilliant green (BG) and Methylene blue (MB) dyes performed an excellent photocatalytic activity under halogen lamps. As a result, the antimicrobial studies for x-CuTiAP nanospheres with Staphylococcus Aureus (St. a) (gram-positive), Pseudomonas aeruginosa (Ps. a) (gram-negative) pathogens and Candida albicans (C. a) (fungal) pathogens are enhancing their antimicrobial activity with observed to the higher inhibition. x-CuTiAP nanospheres have very good stability and radical properties.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryThis study demonstrates a simple and low-cost process for the in-situ doping and decoration of ZnO nanorods with carbon (CC–ZnO). In CC–ZnO, C-doping decreased the charge density (1.75 × 1018 cm?3) at the non-active sites of ZnO and decreased the charge transfer resistance (101 Ω) at the C-doped-ZnO/electrolyte interface by suppressing native defects and reducing the Schottky barrier height (–0.20 eV), respectively. Moreover, C-decoration enhanced the amphoteric performances of ZnO to react efficiently with H+ and OH? ions in an aqueous electrolyte, demonstrating a high pH sensitivity (48 mV/pH) and fast response time (7 s). Moreover, C-decoration enhanced the dispersion stability (92 h for 7.5 mg/mL concentration) and surface area (43.08 m2·g?1) of CC–ZnO in liquid phase, improving the monolayer adsorption capacity (119.40 mg/g) for the removal of rhodamine B (RhB) from aqueous solution. The optimum concentration and pH value of CC–ZnO and aqueous solution were determined to be 25 mg and 6.5, respectively, for maximum (84 %) removal of RhB in the initial five hours of reaction. Adsorption rate analysis revealed that CC–ZnO removed RhB through pseudo-second-order kinetics.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryCo-working by lotus-leaf effect and self-healing shows a great potential against marine corrosion as it could form a barrier capable of water repelling and microdefect healing on the substrate. We developed a firm and self-healing superhydrophobic coating (SHC) technology, in which carbon steel substrate was first coated with fluoroethylene vinyl ether resin/polycaprolactone (FEVE/PCL) hybrid resin, and then sprayed with SiO2. Results showed that the hybrid resin could strengthen the interface between the SiO2 layer and the substrate and could heal microdefect due to the thermal exudation effect of PCL, and consequently form a corrosion barrier. The SHC exhibited great water resistance, stability, and durability. This dual-layered coating performed excellently in corrosion prevention. With the thermal exudation effect of PCL, the dual-layered coating could quickly recover its superhydrophobicity and corrosion resistance under thermal stimuli, making it possible to protect metal substrate persistently. Therefore, this approach provides an easy technique against marine corrosion with water repelling and scratch-healing ability, and shall be promising for long-term corrosion protection.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryIn this paper, the snowflake-like ZnO nanomaterials were prepared by combining zinc salt impregnation and high-temperature calcination with carbon microspheres as the sacrificial template. The effects of ethanol concentration in aqueous solution on the microstructure and sensing properties of ZnO nanomaterials were investigated. The results showed that using 25 % ethanol-containing aqueous solution as impregnation solution, snowflake-like ZnO nanomaterials (ZnO-25) showed excellent sensing performance for NO2 at room temperature. It is mainly attributable to the rich channels and large specific surface area of the snowflake-like ZnO, which facilitates the rapid diffusion of the target gas. A large amount of chemisorbed oxygen can promote the surface reaction. In addition, the unremoved carbon during calcination promotes the electrical properties of ZnO. This strategy will provide a new sight on developing a type of sensitive NO2 gas sensing device working at room temperature.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryUltrahigh molecular weight polyethylene (UHMWPE) fibers have an ultralow interfacial property because of their extraordinarily smooth and nonpolar surfaces, and this property is a persistent problem in UHMWPE fiber-reinforced composites. In this investigation, a novel one-step and mild strategy for enhancing the interfacial property of UHMWPE fiber-reinforced composites was reported. In this strategy, a biomimetic layer with abundant stacked and three-dimensional nanoparticles formed on fibers surface through the synergistic effect of polydopamine and 3-aminopropyltriethoxysilane. Owing to the unique three-dimensional structure and sufficient polar groups on the fibers surface, surface roughness and surface energy significantly increased, and wettability improved. Consequently, the interfacial shear strength (IFSS) of the fibers exhibited a 407.8% increase (8.36 MPa) relative to that of untreated UHMWPE (2.05 MPa) because of these synergistic effects. Further analysis indicated that the failure mechanism of the fibers with the highest IFSS was the transformation from adhesive failure to cohesive failure and substrate failure. The mild preparation process maintained the high crystallinity and orientation of the modified UHMWPE fibers, which exhibited a high tensile force of up to 81 cN.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryThis study focuses on the influence of the resultant force caused by the density difference of the two phases on the droplet generation process in a step-emulsification microfluidic device. Three-dimensional visualization is used to observe the characteristics of droplet generation. According to the difference in droplet generation form, it can be divided into drip generation mode and suspended generation mode. In the suspended generation mode, the droplets are more inclined to the formation process of the expansion of the ellipsoid, whose size in the horizontal direction is larger than the vertical direction; while in the drip generation mode, the shape of the droplet is opposite. The control stage of the droplet generation under various operating conditions is determined. As the viscosity of the dispersed phase increases, the control stage of the suspended generation mode is the necking stage, and the control stage of the drip generation mode changes from the first stage of three-dimensional expansion to the necking stage. The model of the droplet generation is proposed by combining mechanical analysis and experimental testing data, and the droplet size prediction formula is thereby obtained.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryA double immobilisation technique was developed for C. antarctica lipase (CALB) that improved its enzymatic activity and solved difficulties frequently observed in reactions catalysed by lipases. The first immobilisation consisted of CALB adsorption onto a TiO2 nanoparticle surface (CALB TiO2). The adsorption was carried out by an oriented monolayer formed by CALB's hydrophilic amino acids and the TiO2 surface, leaving the CALB's active site accessible for reaction. As a result, an increase in enzymatic activity was achieved. The Relative Enzymatic Activity ((REA) obtained was 289%. The second immobilisation consisted of CALBTiO2 entrapment into calcium alginate microbeads [(CALBTiO2)EDTA-Ca], obtained by an internal crosslinking ion-exchange mechanism and using microfluidic droplet technique. The microbiocatalyst obtained, (CALBTiO2)EDTA-Ca, retained a high enzymatic activity (REAt=0 = 232%) and stability (REAt=30days = 263%) at a size (diameter, ?=8.9·104 nm) that enabled easier recovery than CALBTiO2 (? = 2.3·102 nm) or CALBFree (?=5.0 nm), and showed a favourable porosity for diffusion without releasing CALBTiO2. Although the microbeads showed CALBFree leaching, as demonstrated by the loss of REA after a mechanical resistant test, (CALBTiO2)EDTA-Ca maintained an almost constant REA.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryExploring high-efficiency dual-functional electrocatalysts to drive electrochemical water splitting is of great importance for advancement of renewable hydrogen energy. Herein, a hierarchical core–shell structure electrocatalyst ZIF-Co2P/V3P is in situ grown on Ni foam (abbreviated as ZIF-Co2P/V3P@NF) by a stepwise method. Firstly, Co, V layered double hydroxides (CoV-LDHs) is grown directly on Ni foam (NF) substrate by solvothermal method. Secondly, CoV-LDHs@NF is transferred into 2-MeIm solution and its surface is coated with a layer of imidazolate zeolite skeleton (ZIF). Finally, ZIF-Co2P/V3P@NF catalyst is obtained by low-temperature phosphorization method. The performance of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) can be adjusted by tuning molar ratio of Co/V, and the optimized ZIF-Co2P/V3P@NF-2 manifests superior performance due to its core–shell structure covered by ZIF skeleton, rich heterogeneous interfaces, as well as the positive synergistic interaction between the Co2P and V3P. The overpotentials are only 57 mV@10 mA cm?2 for HER and 261 mV@10 mA cm?2 for OER. Remarkably, the alkaline electrolyzer assembled with ZIF-Co2P/V3P@NF-2 catalyst acquires a small operating voltage of 1.54 V to drive the current density of 10 mA cm?2 and displays excellent long-term durability. This work provides a novel opinion for design and preparation of non-noble metal electrocatalysts.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryThe authors regret “to add and change the order of authors. The revised order of authors are Zhichao Zhanga, Hongbing Yua,*, Wei Wangb,*, Xin Xub, Xi Liub, Yuanling Lia, Peng Zhangb”. The authors would like to apologise for any inconvenience caused.
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