查看更多>>摘要：A robust formulation was developed to produce anti-reflective and self-cleaning coatings, consisting of hierarchical mesoporous silica, modified mesoporous titania nanoparticles and siloxane resin along with other ingredients. The hierarchical arrangement of nanoparticles by the process of self-assembly along with the polymerization of resin developed hierarchical micro and nanoscale structure on the coated surface because of the in-situ generation of raspberry-like particles during film formation. A systematic study was carried out to investigate the effect of additives on the microstructure, optical property and wettability of the coatings. The optimum composition of the coating has anti-reflective property with maximum transmittance of 99.6% (364 nm) with an absolute increase in transmittance of 5.3% in the wavelength range of 360-600 nm with a contact angle of 140 degrees with water. The addition of Hexamethyldisilazane (HMDS) into the formulation enhanced the hydrophobicity of the coatings by extending the formation of more micro-nano scale structure. Moreover, developed coatings have 5B adhesion, significant humidity resistance, passed the 3H pencil hardness test and are thermally stable up to 250 degrees C. The developed process is also suitable for low temperature organic substrates, feasible for scale-up production and the stable formulation can be available in a two-pack system. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Park, KanghoHyeon, SukwonKang, Kyoung MinEum, Kiwon...
6页
查看更多>>摘要：In this study, we are the first to observe the alignment behaviors of various assembling molecules with different feature sizes and shapes, including rod-, disc-, and column-shaped molecules, on zeolitic imidazolate framework-8 (ZIF-8) surfaces. Among the various rod-shaped 4-alkyl-4'-cyanobiphenyls (nCBs), those with short alkyl chains with less than nine hydrocarbons (e.g., 5CB, 6CB, 8CB, and 9CB) were vertically aligned on the ZIF-8 surface, while nCBs with long alkyl chains with more than 10 hydrocarbons (e.g., 10CB and 11CB) were randomly oriented on the surface. Unlike rod-shaped small molecules, the disc- and column-shaped molecules were randomly oriented on the ZIF-8 surface. A molecular dynamic simulation revealed that the vertical alignment of rod-shaped molecules on the ZIF-8 surface can be attributed to physical anchoring by the ZIF-8 micropores. Most portions of the alkyl chain of nCB with shorter alkyl chain lengths (n <= 9) can be inserted into the ZIF-8 aperture, while nCBs with longer alkyl chain lengths (n > 9) cannot be adequately anchored in the ZIF-8 aperture. According to these results, we believe that MOF materials with micropores can offer an effective tool for controlling the orientation of various functional small molecules. (C) 2021 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
查看更多>>摘要：In this study, 250 nm sized porous anatase TiO2 nanospheres (TiO2 NSPs) composed of similar to 10 nm sized anatase TiO2 nanoparticles are obtained through a green synthetic route and their surfaces have been decorated with 3-4 nm sized plasmonic silver nanoparticles (AgNPs). Photoluminescence studies confirm that the AgNPs presence on TiO2 NSPs surface effectively inhibits the radiative charge recombination and thus facilitates charge separation process at the Ag-TiO2 NSPs interface, causing an enhanced photocatalytic activity. About 92% of the ceftiofur sodium (CFS) antibiotic taken initially is oxidized by Ag-TiO2 NSPs upon 90 min white light irradiation, while Ag loaded Degussa P25 TiO2 nanoparticles effects only 71% CFS oxidation. The synergistic effect given by plasmonic AgNPs and the continuous framework of anatase TiO2 NPs contributes to inhibit the electron-hole recombination in the Ag-TiO2 NSPs. Oxidation products of CFS in different water sources and their eco-toxicity effects identified through LC-MS and microtoxbioassays, respectively, indicate that the obtained oxidation products are non-toxic compared to pure CFS. Therefore, porous Ag-TiO2 NSPs could be successfully applied in photocatalytic oxidation technologies, exploiting sunlight for the effective removal of pharmaceutical pollutants from wastewater. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：DBD-catalytic system has been widely studied for volatile organic compounds abatement, whereas how to obtain high mineralization rate and low zone emission synchronously remains a challenge. In view of this, a new type of multi-stage DBD-catalytic system (MS1) was established to abatement toluene in this study. The mineralization rates of reactors IPC (63.81%) and MS1 (61.14%) were much higher than MS2, PPC1 and PPC2 reactors, which were 48.36%, 46.84%, and 5.8% at 33.8 (Vp-p) kV, respectively. For export ozone concentration, IPC reactor had the highest concentration of 160 ppm, and the values of reactors MS1, MS2, PPC1, and PPC2 were 79, 34.2, 34.25 and 29 ppm, respectively. The catalyst filled in zone II can be utilized to further decompose the residual toluene and intermediates and also promote the decomposition of ozone, which lead to the superior performance of the MS1 reactor. The influence of applied voltage, adsorbed amount, and discharge time on the toluene removal performance was investigated to optimize the operation parameters of MS1 reactor, their appropriate values were 28.3-31.1 (Vp-p) kV, 0.179-0.223 mmol, similar to 1 h, respectively. Lastly, the contribution of disparate zones in multi-stage DBD-catalytic system to the toluene degradation were elucidated on the basis of the GC-MS results. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：The Electro-Fenton process can generate reactive oxygen species capable of oxidizing refractory organic contaminants. However, low regeneration efficiency of Fe2+ restricts its application. Herein, hydroxylamine (HA) was added into the Electro-Fenton (HA/Electro-Fenton) process to accelerate the transformation of Fe3+ to Fe2+. Using dimethyl phthalate (DMP) as target contaminant, the HA/Electro-Fenton system alleviated the two-stage reaction process and accelerated the removal of DMP in the pH range of 2.0-6.0. With improving DMP concentration from 5 mg L-1 to 50 mg L-1, their degradation rate increased in the HA/Electro-Fenton system, while decreased in the Electro-Fenton system. The addition of HA had negligible effect on electro-generation of H2O2, but facilitate the redox cycle of Fe3+/Fe2+ and the generation of hydroxyl radicals, thus improving the degradation of DMP. The final transformation products of HA were N-2, N2O, and NO3. The presence of POI improved DMP degradation, while Cl and organic matters inhibited DMP removal in varying degrees. This study provided useful reference to solve the low efficiency of Fe3+/Fe2+ cycle and expand the pH application range in the Electro-Fenton process. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Abdulwahid, Rebar T.Kadir, Mohd F. Z.Ghareeb, Hewa O.Ahamad, Tansir...
13页
查看更多>>摘要：The investigation of biodegradable polymer electrolyte for energy device applications is of great importance as a suitable alternative to the conventional electrolytes. This paper explores the employment of plasticized methylcellulose (MC)-based polymer electrolytes for energy storage EDLC device application with an energy density (46.29 Wh kg(-1)) close enough to lead-acid batteries. The results have shown that the inclusion of plasticizer can enhance the ionic conductivity to 1.17 x 10(-3) S CM-1. It was found that the prepared polymer electrolyte was stable up to 2.1 V, which is sufficient to be employed as electrolyte and separator in fabrication of electrical double layer capacitor (EDLC). Both t(e) and t(i), values have been quantified from the TNM measurements, where the t(i) values for the electrolytes containing 32 wt.% and 40 wt. % of glycerol plasticizer have been found as 0.963 and 0.802, respectively. The performance of the assembled EDLC was assessed using both cyclic voltammetry (CV) and charge-discharging responses. The absence of redox peaks is evidenced from the CV. The value of initial specific capacitance (C-spe) of the fabricated EDLC is 411.52 F g(-1). The results achieved in this study can be considered as a breakthrough in EDLC devices. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Constructing ordered hierarchical porous electrocatalysts while maintaining their high efficiency and stability for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is highly desirable but still remains challenging. Herein, hierarchical tri-metal-based hollow nano/micro rod-on-rod array structures, including hydroxides and phosphates, are vertically grown on Cu foam by the cation-exchanging and anion exchanging approaches. Such ordered porous architecture, providing multi metal center, regular interconnection of macropore channel, large electrochemical surface area, small charge-transfer resistance, efficient mass transport and electron transfer for overall water splitting in alkaline media. These obtained hydroxide OER catalysts (CoMn LDH@Cu(OH)(2)/CF) and phosphide HER catalysts (CoMnP@Cu3P/CF) exhibited low onset potential, low Tafel slope, and prominent durability. Such excellent performance, ordered porous structure and simple preparation methods indicate that this study provides a new strategy for assembling promising catalysts for water splitting and other applications. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Creation of defects in metal-organic frameworks (MOFs) has been demonstrated to be of significance for many potential applications. MOF-808(Zr), as an important member of MOFs, has attracted extensive attention due to its advantages such as high stability, large surface area and pore size. Therefore, the development of defective MOF-808(Zr) is of great interest. In this contribution, we report that MOF-808(Zr) with abundant defects can be fabricated by the fracture of partial Zr-O bonds in its structure by the treatment of NH4HCO3 solution. During the treatment, the effect of NH4HCO3 concentration and treatment time on the structural properties of MOF-808(Zr) was investigated. The catalytic performance of obtained materials was evaluated by the oxidative desulfurization reaction of dibenzothiophene. The results revealed that MOF-808(Zr) obtained under the conditions of 0.08 M NH4HCO3 and treatment time of 10 min exhibited superior catalytic activity (124.8 mmol/h/g) at 60 degrees C due to the formation of rich defect sites in MOF-808(Zr). (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：We present a strategy that leads to the formation of high-performance hybrid pigments made from natural anthraquinone chromophores (alizarin, purpurin) and mineral supports (palygorskite (PAL), sepiolite (SEP), and hydroxyapatite (HAP)). Thanks to the mineral filler form features and the synergy between the organic and inorganic components, the as-prepared hybrid pigments showed excellent thermal and chemical stability. The natural pigments exhibited strong pH-sensing activity, changing their color upon exposure to HCl and/or NH3 vapors. The PAL-based pigments were found to be the most effective pH indicators, showing pronounced color changes after 10 min of exposure to HCl (Delta E for PAL/A was 7.4). ToF-SIMS, C-13 NMR and XPS techniques revealed interactions between the organic dyes and metal ions present in the minerals. XPS spectroscopy was also used to examine the alterations in the structure of the hybrid colorants following exposure to acid vapors. The proposed pH sensors were successfully applied to elastomer and thermoplastic elastomer matrices. The purpurin-based hybrid pigments exhibited significantly reduced migration from the polymer (about six times lower concentration in ethanol after 14 days). The results of this study pave a new way for the design, development, and application of advanced hybrid colorants with pH-sensing activity and improved stability. (C) 2021 The Author(s). Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
Khan, SikandarIqbal, ArshadKai, ZhangAhmad, Aftab...
10页
查看更多>>摘要：Heavy metals and other organic pollutants are the hazardous materials causing soil and water pollution, hence, bioremediation of these components is a matter of concern for environmental biotechnologists. Twenty one microalgal and cyanobacterial strains were evaluated for removal of copper from aqueous solutions and soil containing 10 ppm copper. 5 out of 21 strains have shown comparatively higher tolerance to copper stress. The biosorption capabilities of all the five strains were assessed using techniques like ultraviolet (UV) spectrophotometers, scanning electron microscope (SEM), inductively coupled plasma mass spectrometry (ICP-MS), and confocal Microscopy. It was found that the five selected strains could grow normally upon incubating with 20 ppm of Cu. Copper removal efficiencies of these microalgae (S. obliquus, A. braunii, C. fusca, L. JSC-1 and C. saccharophila in water were 99.9, 99.3, 97, 96.7, and 96%, while for soil was 73, 75, 71, 70, 68%, respectively. A minor leakage of nucleic acid and protein were detected with time. Furthermore, no any visible morphological changes were observed after six days of treatment, while minor changes were noticed after 12 days in water, and severe morphological deformations occurred after 24 days of bioremediation in soil. Our findings reveal that the selected microalgal strains have high potential for Cu bioremediation at certain concentration for 12 days exposure from water and 24 from soil. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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