查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryA bio-surfactant assisted synthesis route has demonstrated in room temperature for decoration of gold nanoparticles (AuNPs) on g-C3N4 using Averrhoa carambola leaf extract towards mono-nitrophenol reduction under visible light irradiation. Biomolecules of the leaf extract and optimised reaction condition played a vital role on tuning the morphology and optoelectronic properties of AuNPs. The size of AuNPs were found to be 15 ± 3 nm on 2D g-C3N4 sheets by TEM and STEM-HAADF analysis. Among the designed plasmonic hybrid photocatalysts 3-wt% loaded AuNPs on g-C3N4 showed 99.01% of 4-nitrophenol, 97.70% of 3-nitrophenol and 98.50% of 2-nitrophenol photoreduction. The photocatalytic efficiency of Au/g-C3N4 was investigated under several parameters such as pH, initial nitrophenol concentration, and in presence of external inorganic anions. The mechanism of photoreduction of nitrophenol to aminophenol by Au/g-C3N4 was proposed based on the intermediate obtained from GCMS analysis. The observed higher catalytic activity of plasmonic hybrid photcatalysts is due to the synergic chemistry between the conduction band of g‐C3N4 and AuNP plasmonic band, which is well supported by PL, EIS, and transient photocurrent analysis. Kinetic rate constant for 3Au/g-C3N4 was found to be 0.43 min?1 at pH 3. Moreover, the rate of reaction significantly increased in presence of Cl?. ICP-OES analysis of as synthesised 3Au/g-C3N4 plasmonic photocatalyst shows there was no gold leaching even after ten cycles confirming the stability and reusability of the catalyst.
查看更多>>摘要：? 2021Simultaneous electro-transfer of vanadium slag (V-slag) and electrochemical degradation of corncob lignin between two graphite electrodes in sulfuric acid solution were proposed. The electrochemical performance of V-slag dissolved by sulfuric acid solution on the graphite electrode was tested by cyclic voltammetry (CV) and linear polarization (LP) curves. By electrochemical transfer of Fe2+/Fe3+ and VO2+/VO2+ couple, it was found that iron and vanadium in V-slag played an important role in electrocatalysis. SEM, EDS and FT-IR were conducted to characterize the morphology, surface composition and the functional groups of lignin residues. By the inductively coupled plasma spectrometer (ICP) analysis, the cumulative removal rates of Fe and V in V-slag could reach up to 61.3% and 52.6%, respectively after multi rounds reaction. 30 kinds of compounds were identified in the process of degradation via GC–MS analysis. These results provided a new process for valorizing two widespread waste materials, V-slag and corncob lignin.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryHerein, we propose a silicone-based conductive composite textile (CCT) with an excellent durability and electrical conductivity by optimizing the thermal curing process for the conductive silicone. The proposed conductive textile was prepared via a thermal curing process after the screen printing of a silicone composite containing a conductive filler on the textile surface. During thermal curing, the silicone polymer present on the textile surface underwent thermal diffusion and penetrated the fabric substrate. As a result, a mechanically interlocked structure was formed between the infiltrated silicone and the fiber to provide a high elasticity, and the silicone remaining on the textile surface formed a hybrid cross-linked structure connecting the conductive fillers to produce an excellent conductive network. An excellent elastic recovery (78.3%) was found for CCT prepared at 150 °C for 4 min during the initial stage of the cyclic strain recovery test, and the high strain recovery rate was maintained even after 10 cycles. Scanning electron microscopy-energy dispersive spectroscopy revealed no significant change in the internal structure even under repeated strain, and an excellent electrical resistance (68 Ω) was maintained even after the application of repeated stress.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryWhile the efficient usage of biomass waste can significantly help in addressing environmental issues, there are only a few reports that discuss about processing such waste effectively at a low-cost. Such challenge arises from the strong association between the components biomass. In this study, an abundant agricultural byproduct, rice husk (RH), was used as the starting resource. A simple biorefining process of alkaline peroxide treatment followed by acid precipitation and ethanol extraction was performed on RH to obtain cellulose, hemicellulose, lignin, and silica. The chemical structures, morphologies, and physic-chemical properties of the separated components were identified through a wide range of characterization approaches. The final products obtained from of this process were (i) bundles of fiber-like cellulose with a fiber width of 6 μm and (ii) small particles of hemicellulose and lignin with non-uniform shapes. The lignocelluloses products had over 90 wt% carbon with 52.28% crystalline ratio. Meanwhile, the other products comprising hemicelluloses, lignin, and silica were amorphous. The outcome of this study contributes to expanding and developing the simple and efficient conversion process of biomass waste into sustainable value-added materials. It is crucial to reduce the environmental impact by using renewable materials as the new building block resources for synthetic chemicals.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryPectin nanogels were fabricated with norbornene group functionalized pectin, dithiol crosslinker, and thiolated ovalbumin (OVA) via a thiol-norbornene photo-click reaction and ultrasonication to develop a novel transcutaneous antigen-delivery carrier. In bulk gel characterization, the physical properties and OVA-loading efficiency were modulated by controlling the crosslinking density and stoichiometric balance between thiol and norbornene groups. Pectin nanogels were of uniform size (～200 nm in diameter) and quite stable under storage conditions (4 °C). The OVA-loaded pectin nanogels penetrated the stratum corneum and were deposited in both the epidermis and dermis, while soluble OVA did not penetrate the stratum corneum layer. The nanogels were internalized by dendritic cells derived from THP-1 monocytes, inducing the upregulation of maturation markers. These results indicate that pectin nanogels are promising carriers for transcutaneous antigen delivery.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryHere, to fabricate an epoxy coating (EP) possessing premier mechanical and thermal features, a nanocomposite of oxidized multiwall nano carbon tube/ ZIF-8 (O-MWCNT@ZIF-8) was prepared through a one-step fabrication approach of ZIF-8 on the O-MWCNT surface through two-different hydrothermal and co-precipitation methods, that are labeled as O-MWCNT-ZIF-8-H/EP and O-MWCNT-ZIF-8-CO/EP, respectively. After introducing the prepared nanocomposite into the epoxy resin, DMTA and tensile tests were applied on the prepared coatings to identify the interactions between the EP/Particles and investigate the resultant thermomechanical properties of the final composites. It was indicated that through the incorporation of 0.15 wt.% of the prepared nanoparticles into the EP matrix, a remarkable enhancement could be achieved on its thermomechanical properties. It is also worth noting that the storage modulus showed a rise of about 7.5% and 1.1% and tensile strength increased about 70% and 40%, while Tg reduced about 12 °C and 16 °C in the case of O-MWCNT-ZIF-8-CO/EP and O-MWCNT-ZIF-8-H/EP samples, respectively, in comparison to the unmodified epoxy (Neat EP) sample. Moreover, the remaining weights of 75% and 77% for O-MWCNT-ZIF-8 compared with 82% for O-MWCNT at 600 °C evidenced the lower thermal stability of the ZIF-8 modified CNT.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryIncorporating high density of nitrogen and amine sites into a proper porous structure is a major consideration for developing CO2 adsorbents. Herein, a novel triazine carbonyl polymer (TCP) was synthesized via one pot Friedel-Crafts reaction and then was post-synthetically functionalized with polyethylimine (PEI) to develop TCP-PEI. The successful syntheses of TCP and TCP-PEI were verified by various characterizations, including FT-IR, XPS, SEM/EDS, and N2 adsorption isotherms at 77 K. The pristine TCP displayed hierarchical pores and a significantly large BET surface area (1940 m2/g), which verified its propriety of being utilized as a support for PEI functionalization. As reasoned, TCP-PEI showed significantly stronger CO2 adsorption than the pristine TCP because of the special interaction between CO2 and PEI. As a result, TCP-PEI exhibited considerably higher CO2/N2 and CO2/CH4 selectivities than TCP. Moreover, it showed almost identical CO2 adsorption isotherms for 5 consecutive cycles. Developing covalent porous polymers with both triazine and carbonyl groups and follow-up PEI functionalization would be an efficient strategy for developing CO2 adsorbents.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryGeneral modification that utilizes insoluble tungstic acid or highly toxic hydrofluoric acid to improve charge separation and transfer in TiO2 results in considerable issues such as uneven doping, significant impacts on particle size and morphology, as well as environmental hazards. In the present work, an environmental benign one-pot dual-modification approach was demonstrated that uses soluble sodium tungstate and only trace-level sodium fluoride as replacements. The photoactivity efficiency for decoloration of methylene blue (MB) solution was improved by 33.6% and 119.5% under ultraviolet and visible light, respectively. Meanwhile, the photocurrent density reached an enhancement by 181.2% by this dual-modification. The dual-modification had negligible influence on the crystal structure and the surface area of the TiO2 nanoparticles. Density functional calculation suggested the remarkable improvements of the photocatalysis of TiO2 can be ascribed to the rapid charge separation and transfer owing to the down-shift of conduction band from the tungsten doping and localized spatial charge separation from the surface fluorination enabled by the dual-modification approach.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryIn this work, a rapid microwave synthesis route is presented for the fabrication of morphology-controlled Cu2S: ZnIn2S4 marigold-like nanoflower heterojunction photocatalysts. The Cu-to-Zn-metal -cation (Cu:Zn) ratios were used to control the Cu2S: ZnIn2S4 heterojunction during the second step of microwave synthesis. The formation of Cu2S: ZnIn2S4 heterojunction is evidenced by XRD, TEM and XPS analyses. The optimum electronic interaction aids to stimulate electron-hole charge separation kinetics and promote the solar hydrogen (H2) evolution performance in microwave-assisted 5 mol.% Cu2S:ZnIn2S4 (Cu2S:ZIS–5) heterojunction. Benefiting from the synergy between marigold-like morphology, heterojunction, and Pt loading, the optimum Pt loaded Cu2S: ZIS–5 marigold nanoflowers (Pt/Cu2S:ZIS–5) exhibited the 862 μmol of photocatalytic H2 production after 3 h under visible light irradiation (≥420 nm). The time-resolved PL spectrum showed more than double carrier lifetime in Pt/Cu2S: ZIS–5 heterojunction (45 ns) than that of Pt/ZIS–15 (20 ns). These visible light-responsive Pt/Cu2S:ZIS marigold-like nanoflower heterojunction shows promising photostability, which would open new opportunities for the development of highly efficient ternary metal-chalcogenide photocatalysts for solar hydrogen generation.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryRecent years have seen a rapid development in industrialization and urbanization with a huge growth in the population throughout the world. In this regard, an efficient and robust decision-making framework for the concept of a green city and sustainable development goals to manage municipal plastic wastes is still needed. This study models a bio-recovery of municipal different plastic wastes management based on a new integrated Multi-Criterion Decision-Making (MCDM) approach through a case study in Mashahd, Iran. The proposed integrated MCDM framework includes the Shannon Entropy (SE), Ordered Weighted Aggregation (OWA), Analytic Hierarchy Process (AHP), Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) and, ELimination Et Choice Translating REality (ELECTRE) systems in an intelligent way. Through decision-making computations, all criteria are approved after extraction from the literature review by experts with more than 60% agreement percentage. Different scenarios of economic, energy, and environmental crises are created. One finding of this paper is to propose a new entrance in economic competition with plastic biodegradation to present a novel, environmental-friendly product with high-quality and low-cost advantages. Another finding determines that with an application of plastic wastes bio-recovery, citizens' satisfaction from urban management system will be increased from 49% to 64%. Whereas, based on the outcomes of this investigation, the rate of municipal waste industries development, smart city goals’ meeting, and rate of hazardous material emission from municipal solid wastes are increased to 58%, 25%, and 70%, respectively. The declared numerical outcomes illustrate the effectiveness of plastic waste bio-recovery on the smart city concept.
NSTL
Elsevier