查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryLithium metal batteries have shown great potential for the development of efficient energy storage devices. However, the uncontrollable growth of lithium metal dendrites results in poor cycling efficiency and severe safety concerns. In this study, amphiphilic triblock copolymers (P123) were used for the direct polymerization of silica precursors, resulting in a well-ordered mesoporous silica structure SBA-15 with a large surface area and excellent absorbent properties for the protective layer. The protective layer consisting of SBA-15 stores Li ions in a large number of pores as an electrolyte reservoir, which exhibits sufficient ionic conductivity. Furthermore, it ensures a spatially uniform Li-ion flux on the anode surface and plays an important role in the physical blocking of dendrite growth. As proof of concept, the SAB-15 protective layer anode demonstrates a high average Coulomb efficiency, rate capability, and cycle stability at 1 mA h cm?2 over 1200 cycles. Moreover, SAB-15 can be cycled stably for more than 750 cycles in symmetric cells. The results provide insights for implementing stable lithium metal anodes in next-generation batteries.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryHerein, we have fabricated silver (Ag) over selenium (Se) to explore its enriched electrochemical performance towards the simultaneous detection of nitro-aromatic drugs (nitrofurantoin (NFT) and P-nitrophenol (P-NP)). Due to its synergistic effect, Ag/Se modified GCE showed excellent electro-catalytic activity compared to other electrodes. Well-defined and divergent reduction peaks were obtained at ?0.49 V (NFT) and ?0.85 V (P-NP) with a detection range of 0.9 V at Ag/Se/GCE. It withholds an extensive linear range of 0.1 to 210 μM for NFT and 0.1 to 150 μM for P-NP with a nanomolar level detection limit of 23.87 nM L?1 & 7.82 nM L?1; an appraisable sensitivity of 1.138 μA μM?1 cm?2 & 2.86 μA μM?1 cm?2 for NFT and P-NP, respectively. Interestingly, the electrode possesses a high selectivity in the presence of biomolecules, nitro drugs, and metal ions. Examination of nitro-aromatic drug contamination on water sources shows a massive peril to human life and marine environs due to its adverse hazardous effects. Further, the fabricated Ag/Se-based electrochemical sensor was exposed to various environmental aqueous samples to detect NFT& P-NP which has demonstrated an exquisite recovery results in practical feasibility. Thereby confirms that Ag/Se-based electrochemical sensors have boundless potential for ecological investigations and sensing applications.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryIn order to obtain a robust, durable and efficient heterogeneous catalyst, macroscopic monolithic Zn-doped α-Fe2O3/graphene aerogel (GA) hybrid architecture with integrated morphology and hierarchically porous structure were controllably synthesized via a facile in-situ hydrothermal method and then used as persulfate (PS) activator for sulfamonomethoxine (SMM) wastewater purification. Several key reaction parameters including the initial SMM concentration, reaction temperature, coexisting inorganic anions and SMM in real natural water samples had different influence on the SMM removal efficiency. The catalytic efficiency of Zn-doped α-Fe2O3/GA with the molar ratio of Fe/Zn = 2:1.5 was about 66%, 62%, 66% and 11%～33% higher than that of GA, α-Fe2O3/GA, Zn/GA and other Fe/Zn molar ratio. The improved activity of Fe/Zn = 2:1.5 benefits from the synergistic effects of the sp2 hybridized carbon and porous framework, as well as the surface oxygenic functional groups, which accelerate the pollutant/oxidant dispersion and electron transfer. Electron paramagnetic resonance results indicate that [rad]OH, 1O2 and SO4[rad]? radicals account for the catalytic degradation of SMM and the activation of PS in present system is different from conventional homogeneous systems, and speculate mechanism was proposed based on the obtained data.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryVisible active photocatalysts have attracted interest as a potentially efficient and sustainable approach for pollutant degradation treatment. In this work, ZnCr mixed metal oxide/fly ash (ZnCr-MMO/FA) composites were prepared using fly ash (FA) from China coal mining power plants to improve photocatalytic performance. The formation of the ZnCr-MMO/FA composites was proved by XRD results which showed the two-phases combination of FA and MMO. Also, the presence of FA in the ZnCr-MMO/FA composite provided a good arrangement of small particles of ZnCr-MMO on the surface of FA and higher light absorption ability with a lower energy bandgap compared with the pure ZnCr-MMO. The photocatalytic performance of the prepared ZnCr-MMO and ZnCr-MMO/FA composites in different FA contents was evaluated by degradation of ciprofloxacin (CIP), which is an antibiotic and often found in pharmaceutical wastes, under visible light irradiation. Clearly, the ZnCr-MMO/FA composites showed higher photocatalytic decomposition of CIP than pristine ZnCr-MMO, and the highest degradation performance for CIP was obtained from the ZnCr-MMO/FA sample with 0.5 mg FA, which has a reaction rate constant approximately four times greater than that of pure ZnCr-MMO. The improved CIP degradation activity of the ZnCr-MMO/FA composite might not only be due to the good arrangement of ZnCr-MMO particles on the FA surface but also high separation and less recombination of photogenerated electrons-holes pairs, proven by the photoluminescence spectra, photocurrent density, and electrochemical impedance spectroscopy results. The lower recombination of the charge carriers of the ZnCr-MMO/FA composite might be caused by the heterojunction between the ZnCr-MMO as a main photocatalyst and FA. Thus, the proposed ZnCr-MMO/FA composite can be used as an effective photocatalyst for wastewater treatment, including the decomposition of organic pollutants, such as discarded pharmaceuticals.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryUnusual stepwise increases of efficiency in fluorescent organic light-emitting diodes (OLEDs) was reported, which has not been observed in phosphorescent devices. However, the root cause of this phenomenon is unclear. Herein, we investigate the correlation between non-linear efficiency characteristics and the leakage current in conjunction with exciton formation in the electron blocking layer (EBL) as a function of voltage. Hole and electron transporting layers with different injection characteristics were selected to control the leakage current into the EBL. It was revealed that a significant amount of excitons were formed in the EBL. It was discovered that the degree of variation in the efficiency curve was directly related to the amount of leakage electrons from the emitting layer (EML) and the number of excitons in the EBL. Moreover, the exciton formation zone (EFZ) gradually shifted from the EBL into the EML as the voltage increased. After device degradation, the stepwise shape of the efficiency curves was significantly deformed, strongly implying that contributions to efficiency by excitons in the EBL vanished. Thus, the unusual stepwise increase in efficiency can be fully attributed to exciton formation in the EBL and shifting of the EFZ from the EBL to the EML.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistrySubcritical water extraction (SWE) was used to extract bioactive parishin B (PB) and parishin C (PC) from Gastrodiae Rhizoma. Extraction conditions were optimized by Box-Behnken design (BBD) of response surface methodology (RSM). The highest yield of PB was 7.46 ± 0.18 mg/g when the solid/liquid ratio (SLR) was 4.5 mg/mL at an extraction temperature of 118 °C and extraction time of 50 min, and the highest yield of PC was 5.27 ± 0.07 mg/g when the SLR was 22 mg/mL at an extraction temperature of 145 °C and extraction time of 23 min. Compared with heating reflux extraction the yield of PB was about 1.3 times higher, and that of PC about 2.6 times higher; Compared with ultrasound assisted extraction the yield of PB was about 3 times higher, and that of PC about 6 times higher. Degradation of parishin A by SWE showed that the increasing mechanism of PB and PC mainly attributed to the conversion of PA into PB and PC. This study suggests that SWE was an efficient and green way to extract natural products with greater values.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryA modelling methodology based on the precision-complexity binomial has been applied to a parametric model established for the Gibbs function, in order to achieve the best parameterization. This methodology is integrated into a multi-objective optimization method to describe, as accurately as possible, the real behaviour of a set of binary solutions of butyl butanoate-alkanes, for which several of their properties have been experimentally determined. The optimization is addressed with a genetic algorithm with elitism-control that favours the convergence, providing well distributed results along the efficient-fronts. A database of, approximately 1500 values, was generated, which used to check the numerical procedure. The representation of different properties is acceptably described with the multiproperty model constituted by the gE-model and its successive derivatives. In relation to other models, the approach carried out significantly improves the results because, in addition, it includes an estimation of the volumetric effects. A practical application was carried out with the simulation of a separation process for one of the systems that present a complex behaviour, providing solutions for its implementation in an industrial scale.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryThe aim of this research is to fabricate slippery lubricant-infused porous surface (SLIPS) coatings on the fluorosilanized porcelain substrates to prevent biofilm adhesion with a less complex and inexpensive method that has not been reported before. SLIPS coating's great potential for inhibiting biofilm induced by algae and bacteria was demonstrated in a modified BG11 environment statically and dynamically. The inhibition mechanism of SLIPS coating against microorganism adhesion and colonies formation was based on its liquid-like surface as the main contributor. Toxicity assay studies demonstrated that the toxicity of applied lubricants had nothing to do with it. The effects of bacteria in culture medium and type of lubricant on the degree of algae settlement over SLIPS coatings were investigated. It was indicated that applied SLIPS coatings could slow down algae biofilm settlement up to 90%. Also, in the presence of bacteria, this percent was declined to 75%. The lubricant type presented no significant effect against biofilm settlement of Chlorella vulgaris mono or its mixed cultivation with Escherichia coli (P > 0.05). The results will provide basic data for functional application and lubricant selecting instruction to fabricate SLIPS coatings for inhibition of biofilm formation on porcelain substrates such as porcelain insulators.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryDue to its low cost, high specific co, and environmental friendliness, zinc is considered a potential anode material for aqueous rechargeable Zn-ion batteries. However, practical applications remain a challenge due to uncontrolled dendrite formation. Herein, we have utilized a strategy where a microporous nanofiber layer of polyacrylonitrile (PAN) is electrospun onto Cu foil and used as the current collector for the anode to inhibit dendrite generation. The polar nitrile groups on the nanofibers expedite the uniform transport of Zn2+ and allow homogenous Zn deposition, which ultimately inhibits dendrite growth. The symmetrical cell equipped with this new fabricated electrode shows over 270 stable cycles without a short circuit. The full cell formed with MnO2 as the cathode exhibits improved cycle stability up to 300 cycles at a current density of 0.5 A g?1.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryThe construction of rough and porous hydrophobic membrane surface is expected to overcome the obstacles including low permeate water flux and membrane pore wetting which greatly restrict the development of membrane distillation (MD) technology. In this study, a rough and porous polytetrafluoroethylene (PTFE) powder-embedded polyvinylidene fluoride (PVDF) hydrophobic coating layer was compounded on the outer surface of PVDF hollow fiber support membrane by the dilute solution coating-phase inversion method. PVDF hollow fiber support membrane was fabricated by the dry-jet wet-spinning technique. PTFE powder was directly incorporated in PVDF dilute coating solution and embedded in the porous PVDF coating layer after the nonsolvent induced phase separation (NIPS). The variations of membrane morphology, surface chemical compositions, hydrophobicity and wetting resistance were investigated by scanning electron microscope (SEM), Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), dynamic water contact angle (WCA) and liquid entry pressure (LEP) analysis. Membrane separation performance including desalination and ionic dyes removal properties was evaluated by VMD experiment. Compared with PVDF hollow fiber support membrane, both the surface hydrophobicity and the water permeability of the PTFE powder-embedded PVDF hollow fiber composite membrane (HFC) had obvious improvement. The surface WCA and permeate water flux increased from 92.6° and 11.3 kg/m2.h for PVDF support membrane to 133.6° and 26.8 kg/m2.h for the PTFE powder-embedded HFC membrane meanwhile NaCl rejection can be maintained above 99.9% (3.5 wt% NaCl aqueous solution at 50 °C and permeate pressure at 31.3 kPa). The separation performance of HFC membrane can remain stable without obvious pore wetting during the continuous MD operation for 36 h. Different from the desalination, porous hollow fiber membrane would adsorb two different charged dyes, Congo red (CR) and methylene blue (MB) to a certain extent, resulting in the decrease of membrane flux and the change of permeate water quality. Finally, the MD separation mechanism of inorganic salt, anionic dye and cationic dye by PTFE powder-embedded HFC membrane was proposed.
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