查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryIn the present study, a novel two-step method was developed to synthesize high purity magnetic nickel from spent direct reduction of iron (DRI) catalyst. Initially, nickel was leached from spent DRI catalyst by hydrochloric acid and the effect of important parameters including temperature (25–85 °C), leaching time (30–210 min), acid concentration (1–5 M) and average catalyst particle size (111–325 μm) were studied using design of experiments (DOE) approach. 100% Ni extraction with negligible Al dissolution (<0.5%) could be achieved at a temperature of 46 °C, leaching time of 172 min, the acid concentration of 4 M and particle size of 111 μm. Next, the nickel cementation by aluminium powder was investigated thoroughly by considering solution initial pH, aluminium particle size and its addition method, pH adjustment method and temperature as important variables. The structural properties of cemented nickel were characterized by FESEM, XRD and EDX analysis. It was observed that through treating of the optimal leached liquor with 2 M sodium hydroxide, more than 96% of Ni could be recovered by gradual addition of excess Al powder to the solution with initial pH of 0.2. The purity of cemented Ni would be 98.5% if the cementation process was performed at 80 °C.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryAnion exchange membranes for vanadium redox flow battery are prepared by filling pore of polytetrafluoroethylene (PTFE) substrates with poly(arylene ether ketone) with imidazole (PAPI). For facile impregnation of PAPI molecules into pore of hydrophobic PTFE, catechol and polyethyleneimine (PEI) are co-deposited to hydrophilize the surface of PTFE. Compared with the pristine PAPI membranes, dimensional and mechanical properties of the pore-filled membranes improved due to the reinforcing effect of PTFE substrate. While this process reduces water uptake and swelling ratio by 10 % and 8 %, respectively, it enhances the tensile strength by 5 folds. Strikingly, the ion conductivity even slightly increases along with the huge reduction of vanadium ion permeability. Pore filed membranes reveal vanadium ion permeability of 1.4 × 10?7 cm2 min?1–2.08 × 10?7 cm2 min?1 at room temperature, which is 10 times and 3 times lower than those of the commercial Nafion117 and FAP450 membranes, respectively. For the cycling test of VRFB cell with 200 cycles, it shows the coulombic and energy efficiency over 96.5 % and 85 %, respectively, because of the low vanadium permeability. In association with this, the capacity retention behavior is more stable than the commercial membranes.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistrySynthesization of 1H,1H,2H,2H-Perfluorooctyltrimethoxysilane through solvent-free hydrosilylation of 1H,1H,2H-perfluoro-1-octene with trimethoxysilane was efficiently conducted over the RuCl3·3H2O catalyst. The synergistic action of Ru3+ as the active center and the strong electronegativity of Cl? to attract the electron of the electron-donating group –OCH3 in trimethoxysilane, activated the Si-H and thus promoted the reaction. The influences of different reaction conditions including feed order, feed ratio, catalyst dosage, reaction temperature and reaction time on the reaction yield were fully investigated, to conclude the optimized condition to achieve a yield of 86.80% was the feed of 1.2 mol trimethoxysilane per mole of 1H,1H,2H-perfluoro-1-octene, together with the addition of 9.56 × 10?4 mol RuCl3·3H2O per mole of trimethoxysilane, at 80 °C for 4 h; while the additive of CuCl to RuCl3·3H2O catalyst could further improve the reaction yield at 50℃. Finally, after understanding the activity of Ru with different valence state, the reaction mechanism was also proposed.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryMicroencapsulated phase change materials (MPCMs) are often mixed with matrix materials to form phase change composites for energy storage. Typically, MPCMs are easily debonded from the matrix or ruptured, thereby weakening the mechanical properties of composites. This paper aims to simultaneously improve the rupture strength of microcapsules and the bonding strength between microcapsules and matrix to enhance the mechanical properties of composites. The titanium dioxide (TiO2) nanoparticles modified by a silane coupling agent (KH560) were doped into the melamine formaldehyde (MF) shell, forming n-octadecane@MF/TiO2 hybrid shell MPCMs (HS-MPCMs). The doping of modified TiO2 nanoparticles reduced supercooling and improved the thermal stability of microcapsules. Compared with MF microcapsules, the rupture strength of HS-MPCMs was increased by an average of 30.4%. The modified TiO2 nanoparticles also built covalent bonds between microcapsule shell and matrix, which led to better microcapsule/epoxy interface bonding. Thus, the HS-MPCMs/epoxy composites performed higher tensile strength than the unmodified composites. Specifically, the tensile strength of composites was improved by an average of 17.2% at the microcapsule content of 10 wt.% with the aid of the MF/TiO2 hybrid shell. The reinforced MPCMs/epoxy composites are expected to be used as anti-icing coatings in the aerospace field.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryThe effect of the network structure on the thermal actuation of the main-chain liquid crystal elastomers (LCEs) was studied by controlling the strand length and crosslinking density of the network. The LCEs were prepared with the thiol-terminated oligomers synthesized via a thiol-acrylate Michael addition reaction between dithiol and diacrylate monomers. The LCE network structure was formed by crosslinking the oligomers using the pentaerythritol tetraacylate crosslinkers and coupling between the thiol end groups in the oligomer to form disulfide linkages. The monodomain LCE (MLCE) films were fixed by the dynamic exchange reaction between disulfide linkages through ultraviolet irradiation after drawing the polydomain LCE films. The maximum degree of actuation was obtained when 50% of the available thiol groups were crosslinked with the acrylate groups of the crosslinkers. The degree of actuation increased with the oligomer length for sufficiently high crosslinking density. However, the degree of actuation decreased with the oligomer length after reaching the maximum especially for low crosslinker density because crosslinking with long oligomers did not provide enough crosslinking sites and disulfide linkages. Thus, the oligomer length and crosslinking density of the MLCE are important control factors during LCE preparation to obtain the best actuation performance of the MLCE film.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryThe potential impact of antibiotics in water environments affects aquatic organisms, microbial community structure, and resistance genes. In this work, we report the hydrothermal synthesis of two-dimensional (2D) tungsten carbide (WC) nanoparticles on CO32- anion intercalated three-dimensional (3D) self-assembled nickel–cobalt layered double hydroxide (NiCo-LDH) nanorods, for the electrochemical determination of norfloxacin (NRF). The synergistic impact between the dual active components of the prepared electrode offered increased active surface area, high electrical conductivity, and prompt mass and ion diffusion, resulting in improved electrochemical performance for NRF monitoring. In ideal conditions, WC@NiCo-LDH modified electrode exhibited enhanced electrochemical characteristics, wide linear response (DPV = 0.02–83.4 μM and in i-t = 0.002–346 μM), and lowdetection limit (LOD) (DPV = 0.005 μM and i-t = 0.002 μM). Furthermore, good reproducibility, virtuous operational and cycle stabilities, were obtained. The practical applications in real-world samples with acceptable recovery ranges were verified the interference-free sensing of NRF.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryGallic acid (GA) is a polyphenols compound commonly present in wastewater that immensely affects aquatic and human life. GA is also responsible for the inhibitory effects on the microbial activity in the soil, thereby decreasing the fertility of the soil. Therefore, the removal of GA from the wastewater is necessary to combat such issues. The present study focused on the synthesis of reduced graphene oxide (r-GO) incorporated bimetallic (Cu/Bi) based nanorods (r-GO-Cu/Bi-NRs) and their photocatalytic applications. Incorporating GO within the CuBi2O4-NRs might decrease the bandgap value, thereby increasing the interfacial charge transfer. Moreover, GO increased the reactive sites and oxygen defects onto the r-GO-Cu/Bi-NRs that led to the separation rate of the photo-induced charge carriers and migration, thereby enhancing the photodegradation ability of the synthesized r-GO-Cu/Bi-NRs. The synthesis process of the r-GO-Cu/Bi-NRs is facile, novel, and economically viable for the photocatalytic degradation of organic pollutants.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistrySingle cancer starvation therapy (ST) strategy can't achieve satisfactory anti-tumor effect, mainly due to the diversified nutritional sources of tumor cells. Herein, CuS@Axitinib-SiO2@2-Deoxy-D-glucose(2-DG)-CaCO3-RGD nanoparticles (CADCR NPs) were prepared for three-pathway blocking for efficient starvation therapy as well as reinforced photothermal therapy (PTT) and chemodynamic therapy (CDT). After CADCR NPs were targeted to tumor cells, CaCO3 was ruptured in the acidic environment, releasing Ca2+ to chelate glutamine and cutting off the glutamine metabolic pathway of the tumor. 2-DG was also released from mesoporous SiO2 and restrained the glycolytic pathway of tumor cells. In addition, under the thermal stimulus of near-infrared irradiation, axitinib was released from CuS NPs, which inhibited the proliferation of tumor blood vessels, ultimately inhibiting the aerobic respiratory pathway of tumor cells. Interestingly, CADCR NPs also showed potential to reshape the tumor microenvironment (TME) and promoted the transformation of macrophages from M2 to M1 type, increasing the expression of CD8+ T cells in the tumor site. In conclusion, CADCR NPs achieve severe tumor starvation by simultaneously interfering with three energy metabolic pathways, and further enhance tumor treatment with the aid of PTT, CDT, and TME improvement, which exhibits great potential for clinical cancer therapy.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryDue to the unique calcium mineral composition of bone, bone-targeting agents that coordinate with calcium or recognize hydroxyapatite (HAp) have been used to deliver drugs or as imaging agents for the therapy and diagnosis of bone-related diseases. To date, various bisphosphonates or acidic oligopeptide-based bone-targeting agents have been explored. However, bisphosphonates can induce osteonecrosis, and acidic oligopeptide-based molecules have not yet been validated in in vivo bone imaging. In this study, we newly designed β-glutamic acid (βE)-based bone-targeting agents by conjugating mono-βE or tri-βE with polyethylene glycol (PEG) labeled with Cy7 dye (termed as βE-PEG-Cy7 or βEEE-PEG-Cy7). In vitro and in vivo studies showed that βEEE-PEG-Cy7 binds more strongly to calcium-containing particles and HAp than βE-PEG-Cy7, leading to a clearer visualization of bone tissues and knee joints. Compared to alendronate conjugated-PEG-Cy7 (ALN-PEG-Cy7) as a positive control, βEEE-PEG-Cy7 has lower binding affinity to both HAp and bone tissues, whereas it showed less cytotoxicity toward osteoblastic-like cells. Although βEEE-PEG-Cy7 has a lower performance of binding affinity to HAp and in vivo bone tissues, we believe that βEEE-PEG-Cy7 with less toxicity can be used as a bone-targeting agent for in vivo bone tissue imaging.
查看更多>>摘要：? 2022 The Korean Society of Industrial and Engineering ChemistryThe highly efficient performance of H2S absorption is the crucial indicator for haloalkaliphilic biological desulfurization (HBDS) because it immediately concerns the H2S removal efficiency and pH change of alkaline solutions. Therefore, we investigated the effect of operating parameters on the H2S absorption's performance under haloalkaline conditions. The gas–liquid ratio and packing height significantly improve H2S removal efficiency, from 80% to 90% and 66% to 99%, respectively. The absorption temperature had a trivial impact on the H2S removal efficiency, and the maximum value appeared at 45 °C. Additionally, all operating parameters caused pH changes that varied in the acceptable range (0.1 to 0.5) during the absorption process. A rate-based model was successfully developed to predict the haloalkaliphilic H2S absorption process accurately. Moreover, this model could be implemented to effectively evaluate the HBDS system's stability and provide reliable theoretical guidance for the industrial HBDS process to ensure good process stability.
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Elsevier