查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistrySorbents utilizing organic molecules as Cs+-selective ionophores have increasingly gained attention over the years as the need for stable and reusable materials became ever more apparent with the poor performance of inorganic sorbents in acidic and alkaline aqueous environments. Aside from this, organic molecules offer a great degree of flexibility in terms of structure, function, and performance which can be harnessed for sorbent development. As such, various kinds of organic ligands have been employed for sorbent preparation, which include macrocycles like calixarenes and crown ethers, and acyclic molecules like tetraphenylborate and resorcinol formaldehyde. In this review, organic-based sorbents and ligands for Cs+ are described and compared, and the mechanisms underlying their efficacy for Cs+ sequestration are discussed. Improvements to ligand and sorbent development are proposed to address issues on adsorption selectivity, capacity, and material reusability. Moreover, a platform for the preparation of stimuli-responsive ligands and sorbents is presented.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryThe catalyst's performance for hydrogen production is strongly dependent on the proper selection of active metals, supports, and promoters. Nickel catalysts can also be a strong and cost-effective succession. Mesoporous supports containing basic sites on the surface are able to suppress carbon deposition and greater stability to the catalyst. Therefore, in this short review, we focus on hydrogen production through reforming processes especially steam and dry reforming and the nickel catalysts’ performance for hydrogen production. Particularly focusing on effective parameters including mesoporous supports (SBA-15, MCM-41, KIT, and SBA-16) and promoters. Since the trapping of active metals into the MCM-41 mesostructure with smaller pores makes them appreciated for catalytic applications, therefore we highlight the recent literature achievements on DRM by promoted/unpromoted Ni catalysts over MCM-41 support for hydrogen production. In this review, attention will be given to different catalyst particles size and the effect of metal dispersion on mesoporous silica supports for enhancing catalytic activities in a comprehensive and comparative manner.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryPalm oil is recognized as the most widely used vegetable oil worldwide, and its market has recently experienced an important growth mainly driven by China and India. Palm oil has significant value, not only in the food market and as a commodity, but also as an alternative biolubricant due to its massive production and potential to replace petroleum-based lubricants. However, as some concerns related to land use, deforestation, and loss of biodiversity have accompanied said growth, a more controlled extraction process, a better use of the extracted oil, and a higher performance of the obtained products are necessary. This study reviews the literature concerned with the processing and tribological performance of palm oil. It was found that temperature control in different palm oil production processes and some alternatives in additivation can expand the range of options of palm oil as a biolubricant in industrial applications.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryClean and sustainable energy is of one prime interest to current water production demands. Producing unpolluted drinking water and sustainable energy is the next big challenge to overcome. Solar steam generation has great future potentials for mankind. The need to overcome limitations of solar steam generation is in recent penchants. A highly efficient black photo-convertor nanomaterial is synthesized and functionalized to achieve 87% efficiency under one Sun (1 kW m?2) illumination. The black tin oxide (bSnO) nanomaterial was synthesized using electrocatalytic reduction approach, resulting a robust photo-convertor nanomaterial. To enhance the capabilities of water evaporation, polymerization was performed using PANI (polyaniline), and PPy (polypyrrole) referred to as bSnO@PANI and bSnO@PPy, respectively. Various physical factors as narrow bandgap, surface water ratios and localized heating are found remarkable to enhance overall efficiency. The bSnO@PANI was assessed to be at highest elevated temperature by acquiring nearly ～82 °C in close to 100 s under one sun irradiance and nearly ～56 °C when in contact with water body. Thus, final water evaporating rate recorded to be 2.04 kg m?2 h?1 and 1.74 kg m?2 h?1 for water and seawater, respectively. Producing drinking water from dye and sea-water are reported after solar evaporation. Achieving enormous evaporation rate can further be explored for green energy generation.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryHere, tripolycyanamide (TPA) and 2,4,6-triformyl pyrogallol (TDBA) are used to prepare a highly crystalline covalent-organic frameworks based on imine linkages (COFTDBA-TPA) for heavy metal ions (HMIs) detection and removal. Each unit of COFTDBA-TPA had 6 adsorption sites for HMIs (–C[dbnd]O, –NH2, –C[dbnd]N), which could selectively capture HMIs. The typical lamellar structure made COFTDBA-TPA have a larger specific surface area, and the mesoporous structure provided numerous channels for the adsorption of HMIs. Therefore, the COFTDBA-TPA-based electrochemical sensor could realize the detection of Cd2+, Cu2+, Pb2+, Hg2+ and Zn2+ in drinking water, simultaneously. The limits of detection for five HMIs were as low as 0.922 nM, 0.450 nM, 0.309 nM, 0.208 nM and 0.526 nM, respectively. The adsorption capacity of COFTDBA-TPA for each HMI was as high as 711.6 mg/g, 716.9 mg/g, 603.7 mg/g and 618.3 mg/g, respectively. Compared with other adsorbents, it had higher capacity and faster adsorption kinetics. After being recycled five times, the adsorption performance was maintained. This not only provides a reliable platform for the removal of HMIs in wastewater, but also provides new ideas for the use of COFs in the electrochemical field.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryWe have developed green phosphors nanoparticles CaWO4:Tb3+ co-doped Li+ using facial co-precipitation process, which can accurately control the composition, nanostructure, and surface condition of luminescent NPs. The structures and morphology of the developed nanophosphores were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscope (TEM), and energy dispersive X-ray (EDX) methods. Their optical properties were performed by UV–visible, fluorescence, and FTIR methods. The phosphors exhibit green emission peak at 540 nm upon excitation at 255 nm corresponding to 5D0 → 7F2 transitions characteristic of Tb3+ with excellent CIE coordinates (x = 0.282 and y = 0.600), which are in close agreement with the regular NTSC values (xd = 0.290, yd = 0.600). This phosphor powder exhibited a flexible fluorescent mark for the detection of level 1–3 details with high contrast of latent fingerprint (LFP) and I-type V of Cheiloscopy for individual identification in forensic science. Our results reveal that the developed nanophosphors (CaWO4: Tb3+, Li+) has potential practical application for latent fingerprint identifications on different types of non-pores and pores surfaces common to forensic cases to solve crimes and as a valuable tool for law enforcement. Also, the novel nano-phosphor has significant ability to minimise the background fluorescence interference irrespective of the surface type used.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryHerein, we report a new molecular design based on carbazole for the development of high triplet energy bipolar host materials for blue phosphorescent organic light emitting diodes (PhOLEDs). Two new isomeric host materials named, 11CzCzCN and 14CzCzCN were designed and synthesized by modifying the carbazole core with carbazole donor at C1 and cyano acceptor at C8-position. The effective interchromophoric electronic communications between the attached donors and central carbazole were interrupted by virtue of large dihedral angle at C1 and short-axis linkage. Also, the strong charge transfer interactions between the donor at C1 and acceptor at C8 was hampered due to the broken conjugation. As a result, the compounds showed high triplet energy (ET) over 2.75 eV without compromising the bipolar charge transporting property. Interestingly, computations and single carrier device analysis evidenced good bipolar charge transporting ability for 11CzCzCN over its structural isomer 14CzCzCN. The applicability of these compounds as hosts for blue PhOLEDs was explored by using a well-known Flrpic dopant. The 11CzCzCN hosted device showed higher performance with maximum EQE of 20.6%, current efficiency of 39.6 cd/A and efficiency roll off of 8.2% at 1000 cd/m2 over its analogue 14CzCzCN hosted device attributed to its high ET and balanced charge transporting property. We believe that this study would provide valuable insights for executing new molecular designs on carbazole for the development of efficient host materials for blue PhOLEDs.
Rehman Umar A.Hussain K.Aslam Z.Anwar Ul Haq M....
12页
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryThis work was initiated by synthesizing a carboxylic derivative of Calix[4]resorcinarene through a three step protocol confirmed by proton nuclear magnetic resonance (1H NMR) spectroscopy and Electrospray ionization mass spectroscopy (ESI-MS). As synthesized derivative, was used as reducing and capping material for the fabrication of small and stable silver nanoparticles (AgNPs) in aqueous medium under the combined influence of dilute alkali and heat at 90 °C. These nanoparticles were referred as KM20-AgNPs. Techniques used for characterization of AgNPs include UV–Visible (UV–Vis) spectroscopy, Fourier transform infra-red (FTIR) spectroscopy, atomic force microscopy (AFM), dynamic light scattering (DLS) and zeta potential analyzer (ZPA). The finally produced KM20-AgNPs were recognized as highly sensitive and extremely selective voltammetric sensor for low level detection of methylene blue drug in the linear working range of 1–30 nM with limit of detection (LOD) and limit of quantification (LOQ) as 0.16 nM and 0.53 nM respectively. The developed sensor was successfully used for sensing of MB in human blood plasma.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryThis paper describes a facile method for the design and fabrication of hierarchical nanopatterns via aluminum anodization with an application for creating plasmonic crystals. Fabrication of highly-ordered anodized aluminum oxide nanopores requires an applied electric potential for anodization, which is typically set to match the pitch of nanoindentations on Al. This study reports a new voltage regime for Al anodization conditions where the process yields satellite pores of various shapes, periodicities, and sizes around the main pores. These new nanopatterned platforms provide an easy route to fabricate hierarchical metal nanostructures whose energy dispersions are shaped by the mode superposition of the surface plasmon polaritons originating from multiple periodic lattices.
查看更多>>摘要：? 2021 The Korean Society of Industrial and Engineering ChemistryBaCeO3-based ceramics are a unique class of perovskites that exhibit protonic and oxygen ionic conduction, which are ideal for high temperature hydrogen separation applications. This work features Sc-doped BCFe composites with nominal composition of BaCe0.70Fe0.30-xScxO3?δ (BCFSc) (x = 0, 0.05, 0.1, 0.15, and 0.2) that exhibit enhanced thermal, chemical, and mechanical stability. The BCFSc20 (x = 0.20) hollow fiber membranes demonstrated the highest hydrogen and oxygen fluxes among the Sc-doped composites of up to 0.32 and 0.20 mL min?1 cm?2, respectively, at 1000 °C. The BCFSc20 hollow fibers also displayed excellent stability under the hydrogen and oxygen permeation environments, while the permeation performance of the other BCFSc samples with low Sc content gradually deteriorated over the 120-h stability test.
NSTL
Elsevier