查看更多>>摘要：Background: The relatively poor corrosion resistance of magnesium (Mg) alloys significantly restricts their extensive applications in industry despite their superior properties such as good electromagnetic shielding, low density, and good biocompatibility. The formation of a protective coating, especially a hydrophobic coating, can provide corrosion protection for the underlying Mg alloys. Methods: Herein, a slippery liquid-infused porous surface (SLIPS) with good hydrophobicity was developed by infusing MgAlLa-layered double hydroxide (LDH) with silicone oil. In particular, the MgAlLa-LDH was intercalated with sodium benzoate to further improve the corrosion resistance. Significant Findings: A homogeneous liquid layer was generated on the SLIPS, which can effectively prevent corrosion from external corrosive species. Compared with a superhydrophobic coating, the SLIPS showed better corrosion protection in both electrochemical and immersion tests, attributed to the better stability of liquid layer than air pockets. After immersion in 3.5 wt.% NaCl solution for 7 days, no obvious corrosion was observed on the SLIPS. Moreover, the SLIPS presents good self-cleaning and self-healing properties. These good performances made the SLIPS possible to be extensively applied in practice. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Background: Drop mixing in porous media is critical to printing quality of inkjet printing and binder jetting 3D printing, however, the mixing is poor due to restricted pore space. In this study, an alternative hydrophobic/hydrophilic particle arrangement was proposed to enhance dual droplets mixing in a powder bed. Methods: A computational fluid dynamic (CFD) model was first developed to simulate the fluid flow for drops falling on a powder bed by using volume of fluid (VOF) technique. Two drops containing separate solutes sequentially impact an assembly of particles. An index of mixing was proposed to quantitatively describe the degree of mixing by calculating the standard deviation of species concentrations. Significant Findings: To enhance mixing, a new approach was developed to improve liquid mixing by arranging hydrophobic/hydrophilic particles alternatively. Furthermore, drops falling with a horizontal offset was shown to prolong the vorticity for convective mass transportation. With an optimal offset distance of 15 mu m, the mixing degree can be enhanced from 34.2% to 56.2%. The printing strategy developed from this study could apparently enhance drop mixing in porous media and provided potential developments for multiple-component mixing in binder jetting 3D printing. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Background: The introduction of porous metal-organic frameworks (MOFs) enables new opportunities for the development of photocatalysts. Among of them, zeolitic imidazolate framework-8 (ZIF-8) nanofilms coupled with semiconductor heterostructures have promising properties but still rarely reported. Methods: In this study, we developed a new ternary ZnO@ZIF-8/AgI composite via in-situ seamless growth of ZIF-8 nanofilms on the surface of ZnO microrods, and then loading AgI on ZnO@ZIF-8. In such process, ZIF-8 nanofilms not only feature large specific surface areas and abundant reactive sites for capturing the targets, but also provide a favorable environment for subsequent deposition of AgI nanoparticles to construct the stable and efficient ZnO@ZIF-8/AgI photocatalyst. Selected tetracycline (TC) as the target, the as-obtained ZnO@ZIF-8/AgI photocatalyst was applied to TC photodegradation under visible light irradiation. Significant: The ternary heterostructure could increase the separation and migration efficiencies of photogenerated electron-hole pairs of photocatalyst. The as-obtained ZnO@ZIF-8/AgI photocatalyst exhibited good adsorption and photocatalytic performance, which was superior to unitary, binary photocatalysts and control composite (ZnO/AgI@ZIF-8). This study demonstrates the great potential of such a protocol for future photocatalytic degradation of organic pollutants, also provides some new perspective for advanced progress of novel MOF-nanofilms-based heterostructure photocatalysts. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：The N-doped two-dimensional (2D) carbon-based catalysts play a crucial role in the PMS catalytic activity of advanced oxidation processes (AOPs). However, their activation mechanism still lacks a reasonable explanation. A low-cost and one-step synthesis of N-doped graphite-2H nanoplatelets (N-GNPs) were prepared through the calcination under 600 degrees C. N-GNPs(0.5)-600 was applied to activate permonosulfate (PMS) 19.4 times faster than that of pure PMS system under visible light to degrade bis(monochloro-s-triazine) reactive dye. We first demonstrate that electron arrangement in N-GNPs samples can effectively activate PMS and generate O-1(2) as much as SO4 center dot- and HO center dot as the main reactive species. The EPR test results were consistent with the quenching test. Density functional theory (DFT) calculations showed the graphite N adjacent C atoms (Eb= -8.9 eV) were promoted to produce more active sites. Bidirectional regulation of graphite N bonded C atoms form a local electron state, making the C most active electron donation. The 2P(z) orbital of carbon atoms becomes occupied with the free electrons. The localized orbitals lead to the stronger Columbic repulsion of pi electrons and enlarged interlayer distance, making it easier for the electrons to give out and accelerate the free-radical process. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
Tan, Jesslyn K. E.Balan, P.Manivasagam, G.Birbilis, N....
12页
查看更多>>摘要：Background: A new synthesis approach was developed for Mg-Fe layered double hydroxide (LDH) film on oxidised magnesium (Mg) alloy WE43 surface by cathodic electrodeposition. Methods: The synthesised Mg(OH)(2) surface layer provides essential divalent cations and a foundation for the direct growth of an Mg-Fe LDH film through the electrodeposition process with trivalent cations containing solution. Findings: The cross-section analysis results disclosed that the Mg(OH)(2) layer altered the typical morphology of LDH film, leading to structured LDH nanoplates with a thickness of approximately 3.5 mu m. The formation of structured LDH nanoplates resulted from the perpendicular arrangement of the ab-faces of the crystallites to the WE43 surface, as seen from Field Emission Scanning Electron Microscopy (FE-SEM) images. Electrochemical tests in Hank's Balanced Salt Solution (HBSS) report the E-corr value increased by 0.24 V and a decrease in i(corr) by one order of magnitude of Mg(OH)(2)/Mg-Fe LDH composite films against its substrate. Furthermore, the impedance modulus values of Mg(OH)(2)/Mg-Fe LDH composite films can achieve a magnitude of three times greater than its substrate. These results indicate that the Mg-Fe LDH film can effectively capture the corrosion anions during corrosion through the anion-exchange process, making it a promising surface modification for Mg alloy. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Background: Excessive phosphorus is the primary nutrient causing water eutrophication. It is of major practical significance to remove pollutants by membrane filtration while adsorbing phosphorus. Methods: In this study, Zr(OH)(4)-PVDF organic/inorganic nanocomposite membrane was formed by in-situ formation of Zr(OH)(4) nanoparticles from ZrOCl2 precursor by sodium hydroxide solution during non solvent induced phase separation process. Significant Findings: The Zr doping in the in-situ grown films is more uniform, and phosphate could be selectively and quickly adsorbed after the decoration of zirconium, and good adsorption capacity was realized as high as 58.67 mg g(-1). At the same time, this Zr(OH)(4) decorated composite membrane had excellent filtration performance, which could effectively remove organic pollutants, such as dyes. This novel organic/inorganic nanocomposite membrane with Zr(OH)(4) nanoparticles in-situ decoration exhibited high adsorption capacity, fast adsorption kinetics and good repeatability, and some water soluble pollutants such as dyes could be filtered successfully. All these could provide a promising new strategy for the in-situ fabrication of organic/ inorganic nanocomposite membrane and a new direction for the design of efficient phosphorus removal filter membrane with excellent adsorption performance. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Background: Fe2+/H2O2-based photo-Fenton process is often used in pollutions removal. But, Fe-species related low activity at neutral condition hinders their practical applications. Activation of in situ generated H2O2 for Fenton-like degradation of pollutions through catalysts absences of Fe species is expected. Methods: A strip-like benzene and K+ co-doped g-C3N4 (KBCN) was constructed by the thermal polymerization of assembly of melamine and 2-aminoterephthalic acid, then post-calcination in LiCl-KCl molten salt, which was then used to degrade Rhodamine B (RhB) and Congo red (CR) via in situ generated H2O2. Significant findings: Benzene and K+ co-doping were critical both in increasing charge separation and enhancing the H2O2 production. The yield of H2O2 for KBCN was 57.5 mu M in pure water after 60 min irradiation. In the absence of Fe2+, the in situ generated H2O2 could subsequently degrade RhB and CR with the formed . OH. The apparent rate constants of KBCN for RhB and CR degradation were 0.0446 and 0.0497 min (1) , respectively. The advantages of degradation with in situ generated H2O2 in the absence of Fe2+ can provide a new prospective to the environmental friendly Fenton-like reaction. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Background: Industrial and medical wastewater treatment has been the focus of significant research and development in recent years. Especially untreated antibiotics commonly found within the wastewater generated by the hospitals or/and manufacturers have caused serious environmental concerns. Methods: In this work, we proposed a heterogeneous graphene quantum dot (GQD)/ZnO composite as a photocatalyst for degrading antibiotics by using co-precipitation and thermal carbonization processes. Significant findings: The introduction of N-GQDs efficiently facilitates the photocatalytic activity and reaction rate. Indeed, the N-functionalized GQDs, including pyrrolic/pyridinic N and graphitic N, can accelerate the charge transfer rate in the heterostructures. Optimizing the composition of GQD/ZnO catalyst, ultra-high removal ratio (similar to 100%) and significantly improved rate constant (i.e., 1.74 times higher compared to pristine ZnO) was achieved. In the binary catalyst, the presence of N-GQDs enhances the absorption in visible-light region and increases the photo-induced charge carrier, resulting in an elevated photocatalytic activity. This finding reveals that the GQD/ZnO composite structure demonstrated in this work can be employed as an inexpensive photocatalyst for degrading metronidazole (MNZ) in liquid phase under the UV-light irradiation. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Background: Thin film composite nanofiltration (TFC-NF) membranes have been developed for organic solvent nanofiltration. Most of the polyamide TFC-NF membranes are vulnerable to nucleophilic hydrolysis. Methods: A multifucntional amine was crosslinked with a trifucntional non-aqueous monomer namely cyanuric chloride (CC) on surface of self-fabricated polysulfone/polyester terephthalate (PS/PET) membarne support leading to a new polyamine active layer containing TFC-NF membrane named as PA@PS/PET. The fabricated PA@PS/PET membrane was thoroughly characterized by several characterization techniques such as ATR-FTIR, XPS, FE-SEM, Water Contact Angle (WCA), and EDX analysis. Significant Findings: PA@PS/PET TFC-NF membrane showed remakable perfomance in terms of solvent flux for all tested solvents including water, methanol, ethanol and isopropanol. The highest flux was found to be 29.58 L m(-2)h(-1) at 8 bar for methanol. The flux of solvents was found to be inversly related to the viscosity of the solvents. The PA@PS/PET membrane showed remarkably high rejection of solute (Congo Red) reaching to a value of similar to 98%. Moreover, the PA@PS/PET membrane showed permanant flux of 8.45 L m(-2) h(-1) at 2 bar during solute separation (CR dye rejection) tests which hinted the stability of the membrane under the applied operating conditions. (C) 2022 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Background: Basalt flake (BS) was the new type of natural lamellar material with high strength and hardness, chemical inertia, acid and alkali resistance. It was expected to be the excellent anti-corrosion coating filler. The poor compatibility between BS and polymer resin limited its application. Methods: The modification of BS by sulfonated aniline trimer (SAT) was realized by covalent grafting and hydrogen bond adsorption. The structure and function of the materials were studied through spectrum and energy spectrum, electrochemical experiments, theory methods of quantum chemistry and molecular dynamics. Significant findings: The modification of SAT promoted the compatibility of BS and polymer. The stable dispersion of BS was attributed to covalent anchoring via SAT. This promoting effect was evaluated and confirmed by the shielding ability of coatings to corrosive media. Hydrogen bonded SAT behaved pH responsive release and catalytic passivation and corrosion inhibition on steel, and its release at coating defects endowed the self-healing effect. The mechanism was the formation of dense oxide films and SAT adsorption films. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
NSTL
Elsevier