MINERALS ENGINEERING
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2026
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IF 6
Chang Shen,Xiong Tong,Jing Qi,Xian Xie,Ruiqi Xie,Qiang Song
Bis(2-ethylhexyl) phosphate (HDEHP) was introduced as a novel collector for the flotation separation of cassiterite from quartz. Under the optimized flotation conditions (pH 8.0±0.2, HDEHP concentration of 15.0×10 -5 mol/L), a cassiterite concentrate assaying 74.01% SnO 2 was obtained with a recovery of 94.63%, demonstrating excellent separation performance. Compared with benzohydroxamic acid (BHA), HDEHP exhibited superior selectivity over a broader pH range. The adsorption mechanism was systematically investigated through contact angle measurements, zeta potential analysis, FTIR, XPS, ToF‑SIMS, AFM, and DFT calculations. The results indicate that HDEHP chemisorbs onto the cassiterite surface primarily via its PO(OH) groups, which coordinate with surface Sn sites to form a stable hydrophobic layer. In contrast, its interaction with quartz remained weak. DFT simulations further revealed that electron transfer and orbital hybridization occur between the oxygen atoms of HDEHP and surface Sn atoms, leading to stable chemical bonding and enhanced adsorption. Consequently, due to its strong and selective adsorption on cassiterite, HDEHP serves as an effective collector for the flotation separation of cassiterite from quartz.
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International Journal of Greenhouse Gas Control
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2013
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IF 3.944
Zhicheng Xu,Shujuan Wang,Changhe Chen
The cyclic capacity and cyclic loading of mixtures of 1,4-Butanediamine (BDA) and 2-(Diethylamino)-ethanol (DEEA) with different concentrations were compared using a fast screening facility. The biphasic solvent, 2 M BDA blended with 4 M DEEA, was found to have higher cyclic capacity and loading than other concentrations and 5 M MEA. The individual amine distributions in the upper and lower phases were measured by DX-120 ion chromatography (IC), with a formation mechanism then proposed for the biphasic solvents and verified with solubility experiments. The reaction products in the two phases were measured by a JNM ECA-600 nuclear magnetic resonance spectrometer (NMR).
研究领域:
化学工程
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碳捕集与封存
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溶剂设计
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分离科学
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JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
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2023
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IF 3.5
Hongming Zhang,Fangyuan Si,Jiawei Dou,Mingxuan Li,Long Wu,Tian Xie,Lanming Zhao,Chuyuan Huang,Xianfeng Chen
Experiments on the flame propagation of starch dust explosion with the participation of ultrafine Mg(OH) 2 in a vertical duct were conducted to reveal the inerting evolution of explosion processes. Combining the dynamic behaviors of flame propagation, the formation law of gaseous combustion products , and the heat dissipation features of solid inert particles, the inerting mechanism of explosion flame propagation is discussed. Results indicate that the ultrafine of Mg(OH) 2 powders can cause the agglomeration of suspended dust clouds, which makes the flame combustion reaction zone fragmented and forms multiple small flame regions. The flame reaction zone presents non-homogeneous insufficient combustion, which leads to the obstruction of the explosion flame propagation process and the obvious pulsation propagation phenomenon. As the proportion of ultrafine Mg(OH) 2 increases, flame speed, flame luminescence intensity, flame temperature and deflagration pressure all show different degrees of inerting behavior. The addition of ultrafine Mg(OH) 2 not only causes partial inerting on the explosion flame, but also the heat dissipation of solid inert particles affects the acceleration of its propagation. The explosion flame propagation is inhibited by the synergistic effect of inert gas-solid phase, which attenuates the risk of starch explosion. The gas-solid synergistic inerting mechanism of starch explosion flame propagation by ultrafine Mg(OH) 2 is further revealed.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Huaiwei Zhang,Yifan Chen,Liang Bao,Jing-yuan Ge
The green synthesis process of photocatalytic ammonia production has received more and more attentions. Herein, a Z-scheme heterojunction with all-solid-state structures is constructed, in which carbon dots can act as electron transferring mediators. The photocatalytic measurement shows that the modified photocatalysts exhibit much higher activities, in which the ammonia production rates can reach above 232 µmol·g cal -1 ·h −1 under the light irradiation. The improved catalytic properties can be credited to the significantly increased number of photoinduced oxygen vacancies, the excellent visible-light adsorption abilities and photogenerated electron-hole separation efficiencies for the carbon dots bridged heterostructures. More hydroxyl and superoxide radicals can be simultaneously produced in the composites. This work provides reasonable guidance for applications in photocatalytic ammonia synthesis and a promising construction strategy of efficient Z-scheme photocatalysts.
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PubMed
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
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2023
·
IF 1.9
Hong-Yan Wu,Ju-Xiang Luo,Hao-Hong Li,Jian-Han Zhang
Two new heterometallic uranyl-organic frameworks (UOFs), [Cd(phen)2(H2O)2][(UO2)2(BDC)3]·2H2O (1) and [Ni(phen)3][(UO2)2(BDC)3]·2H2O (2), were obtained under hydrothermal conditions. Both crystal structures were characterized by single-crystal X-ray diffraction analyses and the results indicate that both complexes feature a similar 2D honeycomb framework that is connected by rigid benzenedicarboxylate (BDC) ligands and uranyl units. BDC works as a linker to bridge neighboring UO22+ units, where UO22+ is tris-chelated. Different guest molecules guided the stacking of 2D layers and lead into their 3D supramolecular crystal structures with different space groups. As a result, 1 crystallized in a polar space group Cc, whereas 2 belongs to a chiral space group P6122. Thermogravimetric measurements were performed to study their thermal stability. UV-visible diffuse reflectance spectroscopy measurements indicate an experimental optical bandgap of 3.87 eV and 3.63 eV, respectively, for 1 and 2. Luminescent studies of both samples show strong green light emissions.
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Materials
·
2023
·Vol. 16
·期 4
·1568
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IF 3.4
Feng Wang,Yaoqi Gu,Jianrui Zha,Shuya Wei
Ca(OH)2nanoparticles are effective materials for cultural heritage restoration, hazardous substance absorption and photocatalyst. However, many methods are complex, and the particle sizes are usually above 80–100 nm, involving mediocre efficacy for application in the stone restoration field. In this work, Nano Ca(OH)2with diameters less than 70 nm and composited with Graphene Quantum Dots (GQDs) were successfully synthesized in aqueous media. The morphology and structure of the nanoparticles were investigated with TEM, HRTEM, XRD, Raman and FTIR. The particle size distribution and relative kinetic stability of the Ca(OH)2in ethanol were performed using a laser particle size analyzer and spectrophotometer. Firstprinciple calculations based on the spin-polarized density functional theory (DFT) were carried out to study the reaction process and combination model. The nanoparticles, as prepared, are composed of primary hexagonal crystals and high ammoniated precursors, which have a positive effect on reducing the grain size, and interacted with the GQDs hybrid process. According to the First-principle calculations results, the energy variation of the whole reaction process and the bonding mode between Ca(OH)2and GQDs can be understood better.Keywords:Ca(OH)2;Graphene Quantum Dots;DFT;complex;nanoparticles
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Lina Wu,Xinjie Wang,Xiangchuan Wu,Shiqi Xu,Ming Liu,Xizhong Cao,Taishan Tang,Xingxu Huang,He Huang
The CRISPR-Cas system was developed into a molecular diagnostic tool with high sensitivity, low cost, and high specificity in recent years. Colorimetric assays based on nanozymes offer an attractive point-of-care testing method for their low cost of use and user-friendly operation. Here, a MnO2 nanozyme-mediated CRISPR-Cas12a system was instituted to detect SARS-CoV-2. MnO2 nanorods linked to magnetic beads via a single-stranded DNA (ssDNA) linker used as an oxidase-like nanozyme inducing the color change of 3,3′,5,5′-tetramethylbenzidine, which can be distinguished by the naked eye. The detection buffer color will change when the Cas12a is activated by SARS-CoV-2 and indiscriminately cleave the linker ssDNA. The detection limit was 10 copies per microliter and showed no cross-reaction with other coronaviruses. The nanozyme-mediated CRISPR-Cas12a system shows high selectivity and facile operation, with great potential for molecular diagnosis in point-of-care testing applications.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 4
·1156-1163
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IF 6.813
Guangzhi Ren,Guangyi Li,Ying Zhang,Aiqin Wang,Xiaodong Wang,Yu Cong,Tao Zhang,Ning Li
Jet fuel and diesel range C12 and C17 cycloalkanes were synthesized for the first time by a two-step process with 2-methylfuran and benzaldehyde, two platform compounds which can be derived from lignocellulose. In the first step, 5,5′-(phenylmethylene)bis(2-methylfuran) was obtained by the acid-catalyzed hydroxylalkylation/alkylation (HAA) of 2-methylfuran and benzaldehyde. Among the investigated commercial acidic resins, Nafion resin demonstrated the highest activity for the HAA of 2-methylfuran and benzaldehyde, which can be rationalized by the highest acid strength of Nafion resin. In the second step, the 5,5′-(phenylmethylene)bis(2-methylfuran) from the HAA reaction was further hydrodeoxygenated to jet fuel and diesel range C12 and C17 cycloalkanes. Among the investigated catalyst systems, the combination of H-ZSM-5 and Ru/hydroxyapatite (denoted as H-ZSM-5 + Ru/HAP) exhibited the best hydrodeoxygenation (HDO) performance. Over it, a high total carbon yield (87.3%) of jet fuel and diesel range C12 and C17 cycloalkanes was obtained under mild conditions (453 K and 4 MPa H2). According to our measurements, the mixture of C12 and C17 cycloalkanes obtained from the HDO process has high density (0.816 g mL−1) and low freezing point (240 K). Therefore, it can be blended into current bio-diesel and bio-jet fuel to increase their volumetric heat values. As another option, the C12 and C17 cycloalkanes can also be dehydrogenated to produce alkylbenzenes that can be used as feedstock in the production of surfactants.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Wenhui Wang,Ruikang Zhang,Xiaoru Gao,Borong Yu,Zhan-gang Han,Yuanzhe Gao
Nickel and cobalt phosphates as a kind of low-cost inorganic materials are promising electroactive materials. The structure stability and good dispersibility of micro-spherical materials make them popular in the energy storage field. Therefore, the fabrications of Ni–Co phosphate microspheres with some facile and cost-effective methods have attracted lots of attentions. In this work, we present one-step growth of Ni 2 Co(PO 4 ) 2 microspheres using urea as pH regulator. Urea decomposes into NH 3 and CO 2 during the hydrothermal reaction process, resulting in the precipitation of Ni–Co phosphates. The as-prepared Ni 2 Co(PO 4 ) 2 microspheres exhibit uniform and well-dispersed spherical morphology. Compared with traditional Ni 2 Co(PO 4 ) 2 particles, Ni 2 Co(PO 4 ) 2 microspheres exhibit larger electrochemical specific surface area and smaller resistance of electrons/ions transfer. The specific capacity of Ni 2 Co(PO 4 ) 2 microspheres reaches as high as 153 mAh g - 1 at a current density of 1 A g - 1 , which is 1.59 times higher than that of traditional Ni 2 Co(PO 4 ) 2 particles. In addition, this facile one-step synthetic method can be applied to fabricate series of Ni–Co phosphates with different Ni/Co atomic ratios. This work provides a facile synthetic method of fabricating Ni–Co phosphate materials, which has potential applications in large-scale manufacture.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Weibo Zhang,Shucheng Zhang,Chong Chen,Ning Liu,Dong Yang,Pengjie Wang,Fazheng Ren
Pea albumin (PA) can reach the intestine in the active form because it is highly resistant to gastric acid and proteolytic enzymes after their oral intake, which can supply various bioactivities. However, there is no detailed knowledge of the intestinal cell uptake about PA. The aim of this work was to study the internalization mechanism and intracellular trafficking route of PA. The uptake of PA-cyanine 5.5 NHS ester (Cy5.5) was a time-dependent and concentration-dependent process in Caco-2 cells. Endocytosis inhibitors or small interfering RNA (siRNA) techniques revealed that the internalization of PA-Cy5.5 was energy-dependent and mediated by caveolin-mediated endocytosis. Furthermore, we observed colocalization of PA-Cy5.5 and its subcellular localization in Caco-2 cells by using confocal laser scanning microscopy, which revealed that the intracellular trafficking process of PA-Cy5.5 was related to endoplasmic reticulum, Golgi, and lysosome. Interestingly, PA can alleviate lipopolysaccharide -induced ER stress, which may be the main reason why pea albumin is anti-inflammatory. Overall, our findings suggest caveolin may be critical for PA uptake in enterocytes and could contribute to explore the bioactivities mechanism of pea albumin in body.
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BIOMEDICINE & PHARMACOTHERAPY
·
2022
·
IF 7.419
Zhiqi Zhao,Yizhang Chen,Xiaoqiong Li,Liying Zhu,Xin Wang,Li Li,Haibiao Sun,Xiaoqiang Han,Jinjun Li
To verify the role of myricetin in alleviating the symptoms of type 2 diabetes and regulating the intestinal flora, we established a type 2 diabetes mouse model. After being fed a high-fat and high-sugar diet for six weeks, mice were intraperitoneally injected with streptozotocin (80 mg/kg body weight [BW]) 2–3 times. Type 2 diabetes mice were randomly divided into type 2 diabetes control (T2DM) and myricetin intervention groups. Water and food intake, fasting blood glucose (FBG), and BW were monitored weekly. After six weeks of myricetin administration, superoxide dismutase (SOD) levels and blood lipid content were measured. Furthermore, 16S rRNA sequencing was used to detect the gut microbiota composition. FBG and blood lipid levels of T2DM mice were significantly reduced upon myricetin treatment, while SOD levels were increased. Myricetin improved polydipsia, polyphagia, polyuria, and weight loss in T2DM mice. In addition, the signature type 2 diabetes microflora was established by analyzing the microflora structure of healthy mice, type 2 diabetes mice, and mice treated with myricetin. Results showed that type 2 diabetes disrupted the mice intestinal flora, and myricetin intervention normalized the intestinal flora. In conclusion, our results indicate that myricetin alleviates type 2 diabetes in mice and regulates the intestinal microflora.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Liangjun Zhou,Wenxi Wang,Dekang Xu,Zhenyu Wang,Zhibin Yi,Min Wang,Zhouguang Lu
Thermal quenching of luminescence is the most critical problem for rare earth doped phosphors used in light-emitting diodes (LEDs). Herein, we demonstrate that thermal quenching can be considerably suppressed via the negative thermal expansion effect in Zr(WO 4 ) 2 that serves as host for Eu 3+ red emission. The photoluminescence (PL) intensity is surprisingly enhanced by 130% when the temperature is raised from room temperature to 100 °C. As temperature further increases to 160 °C, the PL intensity turns to reduce, which is still 1.4 times of that at room-temperature. Moreover, Zr(WO 4 ) 2 :15%Eu phosphor has good durability, which still exhibits strong red luminescence (only 13% loss) after being kept in 85 °C/85% relative humidity chamber for 240 h. The anti-thermal quenching of Eu 3+ luminescence can be ascribed mainly to the following two factors: first one is the thermal-enhanced energy transfer between Eu 3+ ions induced by the contraction of Zr(WO 4 ) 2 unit-cell volume that leads to the strong structural rigidity of host lattice; second one would be electron traps in the host that favors the increase of electrons on the excited energy levels. This important anti-thermal quenching effect induced from the negative thermal expansion of the host matrix may stimulates a novel and efficient approach to design highly thermal stable phosphors for next-generation LEDs.
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危险品化学品经营许可证（带存储）