ENERGY & FUELS
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2023
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IF 5.3
Zhiqi Zhao,Xue Xia,Yanan Li,Daiwei Liu,Wei Cai,Chuanxian Li,Guangyu Sun,Bo Yao,Fei Yang
Dodecylbenzenesulfonic acid (DBSA) is injected into wellbores as an asphaltene dispersant to alleviate asphaltene deposition problems. The addition of DBSA will change the dispersion of asphaltenes in the crude oil, affecting the wax precipitation property of the crude oil as well as the adsorption behavior of asphaltenes at the oil–water interface, thus significantly altering the W/O emulsion’s stability. In order to provide better theoretical guidance for oil–water separation in oilfield gathering and production processes, in the paper, the effects of DBSA concentration (from 0 to 500 ppm) on the emulsions’ stability containing both asphaltenes and paraffin wax and the mechanism were systematically investigated at two different temperatures (30 and 15 °C) based on the wax precipitation and rheological properties of the model crude oil, the oil–water interface adsorption properties, and the macroscopic and microscopic properties of the emulsion. The outcomes demonstrated that the test temperature had a highly substantial impact on the model emulsion. The main element affecting the stability of the emulsion at 30 °C (above the wax appearance temperature (WAT)) was the interfacial structure’s strength. The low-temperature flowability of the oil phase primarily controlled the process of emulsion stabilization at 15 °C (below the WAT). Furthermore, we speculate that the wax crystals could precipitate on the surface of the emulsified droplets, which also facilitated emulsion stability at 15 °C. Combining the above experimental observations, the mechanism of DBSA concentration affecting the emulsion stability was proposed, which would contribute to solving the issues in the emulsion breaking and dewatering process of crude oil emulsions.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
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IF 10.9
Jing Zhao,Zicheng Cai,Yue Fan,Yunan Wang,Yu Song,Jie Liu,Shuangwen Li,Di Guo,Xiaoxia Liu
Potassium ion capacitors (PICs) are regarded as promising large-scale aqueous energy storage systems. However, due to the poor K + transport kinetics and the structural instability of the cathode materials, the key issues of limited energy density and poor cyclic stability are obstacles to the in-depth growth of PICs. Herein, a novel O-doped perovskite fluoride is demonstrated via an in-situ electrochemical oxidation strategy as the cathode for PICs, introducing additional defects that improve the capacitance and facilitate the reaction kinetics of the electrode. During the electrochemical oxidation process, it is discovered that the perovskite fluoride crystal tends to transform into disordered O-doped KMnF 3 (K x MnF y O z ), realizing a structural reconstruction at the electrode material/electrolyte interface. The First-principles calculations based on density functional theory (DFT) are performed to confirm that the improved electrical conductivity and low ionic adsorption energy may be ascribed to the substitution of oxygen for fluorine. The obtained K 1.14 MnF 1.17 O 1.26 cathode achieves a high specific capacitance of 694 F g –1 at 1 A g –1 , as well as high capacitance retention of 91.3% after 10,000 charge/discharge cycles in mild K 2 SO 4 electrolyte. This study provides an effective strategy to improve the capacitive performance of perovskite fluoride cathode materials in electrochemical energy storage.
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RSC Advances
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2023
·Vol. 13
·期 12
·8227-8237
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IF 3.9
Xiaofei Fu,Junwu Tao,Zizhou Zhao,Siwen Sun,Lin Zhao,Zuming He,Yong Gao,Yongmei Xia
Reducing the recombination rate of photoexcited electron–hole pairs is always a great challenging work for the photocatalytic technique. In response to this issue, herein, a novel Z-scheme CuInS2/In2O3 with interfacial S–O linkages was synthesized by a hydrothermal and subsequently annealing method. The Fourier transform infrared (FT-IR) and X-ray photoelectron spectrometer (XPS) measurements confirmed the formation of covalent S–O bonds between CuInS2 and In2O3. The quenching and electron spin resonance (ESR) tests revealed the Z-scheme transfer route of photogenerated carriers over the CuInS2/In2O3 heterojunctions, which was further verified theoretically via density functional theory (DFT) calculations. As expected, the CuInS2/In2O3 heterojunctions showed significantly boosted photocatalytic activities for lomefloxacin degradation and Cr(VI) reduction under visible light illumination compared with the bare materials. Accordingly, a synergistic photocatalytic mechanism of Z-scheme heterostructures and interfacial S–O bonding was proposed, in which the S–O linkage could act as a specific bridge to modify the Z-scheme manner for accelerating the interfacial charge transmission. Furthermore, the CuInS2/In2O3 heterojunction also exhibited excellent performance perceived in the stability and reusability tests. This work provides a new approach for designing and fabricating novel Z-scheme heterostructures with a high-efficiency charge transfer route.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Girma Sisay Wolde,Dong-Hau Kuo,Merga Hailemariam Urgesa,Tadele Negash Gemeda
Simultaneous oxidation of benzyl alcohol (BA) and reduction of p-dinitrobenzene (p-DNB) over Gd-doped TiO 2 nanorods decorated with poly(o-phenylenediamine, PoPD) nanowires was reported in this work. The doping of TiO 2 with Gd induced surface defects, i.e., oxygen vacancy (OV) and the Ti 3+ –on-Ti 4+ site, while incorporating PoPD highly enhanced the light absorption capability and electron conductivity of TiO 2 nanorods , as confirmed by UV–vis diffuse reflectance spectroscopy (DRS) and electrochemical measurements, respectively. BA was selectively oxidized by photogenerated h + to form benzaldehyde with a yield of 70.5% in water and 90.6% in acetonitrile solvent. Conversely, p-DNB was selectively reduced to p-nitroaniline (p-NA) with a yield of 89.1% in acetonitrile and to p-phenylenediamine (p-PDA) of 85.0% yield in water. This work demonstrates a vital strategy to utilize the full economic potential of photogenerated charge carriers and the decisive role of solvent for product selectivity in the course of selective organic transformations.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yi Cao,Piao Ruan,YuFeng Xue,Yue Cao,Huang He,Wenfeng Qiu
Nowadays, materials that possess high activity and natural oxygen vacancy have garnered significant attention as potential electrode materials for supercapacitors . In this study, we successfully prepared the Hf 6 Ta 2 O 17 (HTO) nanofibres (NFs) with an orthorhombic superlattice structure using the electrospinning technique and sintering process. The characterization results indicate that the HTO NFs synthesized at 750 °C show good micro nanostructures and outstanding electrochemical properties . To enhance its energy storage performance, additional oxygen vacancies (OVs) were introduced through a carbothermal treatment under an Ar atmosphere. Although longer reduction reaction times can produce more OVs, the integration of grain boundaries and the growth of grain size caused by large annealing times may limit its electrochemical performance. Therefore, the HTO NFs treated for 1 h (HTO/C-1) exhibited the maximum C s of 925 F·g −1 at 1 A·g −1 with a larger voltage window of 2.1 V. Furthermore, a symmetric supercapacitor fabricated by two reduced HTO NFs electrodes and 1 M Na 2 SO 4 solution, recorded as r-HTO NFs//r-HTO NFs. The device demonstrated excellent energy density of 73.3 Wh·kg −1 (at power density of 1050 W·kg −1 ) and a long cycling life (81.8% retained after 5000 cycles). These results suggest that the optimized reduction process can provide appropriate oxygen vacancies in HTO NFs, thereby effectively enhancing its performance.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Lijie Chen,Yuan Gao,Junjie Lian,Le Li,Dexin Ding,Zhongran Dai
Photocatalytic reduction of soluble hexavalent uranium to insoluble tetravalent uranium is a promising strategy for uranium-containing wastewater treatment, while this method generally requires anaerobic conditions and/or the addition of sacrificial agents. Obviously, providing anaerobic environment and sacrificial agent will not only increase the cost but also causes secondary pollution. Thus, efficient removal of U(VI) by photocatalytic techniques under air atmosphere without sacrificial agents is an urgent task and great challenge. In this work, a novel O, K co-doped g-C 3 N 4 (OKDCN) photocatalyst was synthesized by a simple thermal reaction for the photoreduction removal of U(VI) under air atmosphere without sacrificial agents. Batch experiments show that the OKDCN-2 can nearly completely remove U(VI) in the solution within 120 min at pH 5.0. In addition, the OKDCN showed excellent reusability and selectivity in the process of photocatalytic reduction of U(VI). Further mechanism studies show the doping of O and K can improve the photogenerated carrier transfer and separation efficiency of OKDCN, and then improve the performance of photocatalytic reduction of uranium. These results provide a reference for breaking through some bottleneck issues in the research field of photocatalytic removal of U(VI).
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Catalysts
·
2022
·Vol. 12
·期 12
·1583
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IF 4.501
Ximiao Zhu,Fan Yang,Jinhua Liu,Guangying Zhou,Dongdong Chen,Zhang Liu,Jianzhang Fang
A novel phosphorus and oxygen co-doped graphitic carbon nitride (sheetP-O-CNSSA) photocatalyst was successfully synthesized and applied for H2evolution under visible light. In the synthesis process ofsheetP-O-CNSSA, the supramolecular complex was developed by the self-assembly and copolymerization reaction among melamine, cyanuric acid (CA) and trithiocyanuric acid (TCA) to act as g-C3N4precursors, while (NH4)2HPO4was applied as P and O precursors for element doping. The chemical structures, morphologies, and optical properties of thesheetP-O-CNSSAwere characterized by a series of measurements, i.e., XRD, FT-IR, SEM, TEM, UV-vis DRS, and PL. The results suggested that the introduction of P and O elements could enhance the separation and migration efficiency of photogenerated electrons and holes in the energy band of g-C3N4. The photocatalytic tests over Erythrosin B (EB) sensitizedsheetP-O-CNSSAindicated that the hydrogen evolution was greatly enhanced compared with other catalysts and non-sensitizedsheetP-O-CNSSAunder visible light irradiation. Finally, a possible dye-sensitized photocatalysis mechanism was also proposed on the basis of the as-obtained results.Keywords:P-O-co-doped g-C3N4;self-assembly;dye sensitization;hydrogen evolution
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Materials Today Communications
·
2022
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IF 3.662
Lijie Zhang,Weiqun Tan,Mei Zhang,Zhengfa Ma,Tiantao Zhao,Yunru Zhang
Hyaluronic acid (HA)/carboxymethyl chitosan (CMCS) hydrogel was synthesized by using 1-(3-dimethylaminopropyl) − 3-ethylcarbondiimide (EDC) and N-hydroxysuccinimide (NHS) as chemical cross-linking agents. The panax notoginseng saponins (PNS) loaded HA/CMCS hydrogel was prepared by immersion method. The swelling, sustained-releasing, biocompatible, anti-inflammatory and anti-oxidant properties of the hydrogel were investigated, and healing effect of the hydrogel was verified by applying it to skin wound in typeⅡdiabetic SD rats. The results showed that HA/CMCS hydrogel had good swelling property and could absorb water up to 46 times of its own dry weight. The PNS was continuously released in the simulated body fluid for 24 h, and the release rate was 76 %. In vitro cytotoxicity, anti-oxidant and anti-inflammatory experiment of inhibiting macrophage secretion of NO showed that the addition of low concentration PNS(≤5 mg/mL) facilitated cell proliferation and improved the biocompatibility. The ABTS free radical scavenging rate of HA/CMCS-PNS can reach 99 %. In animal experiments, HA/CMCS-PNS hydrogel significantly improved the wound healing speed of SD rats, decreased the expression of TNF-α and IL-6, quickly enhanced the expression of IL-10, and attenuated the body's inflammation response. In the process of wound healing, HA/CMCS-PNS hydrogel up-regulated the expression of VEGF and bFGF in wound, promoted angiogenesis and epithelial cell regeneration, and synergistically promoted the rapid wound healing.
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Materials Chemistry Frontiers
·
2023
·Vol. 7
·期 6
·1072-1081
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IF 7
Yanan Zhu,Yuanfu Deng,Guohua Chen
Carbon materials with large exposed surfaces and heteroatom doping have great potential in suppressing the shuttle effect in Li–S batteries. In this study, crosslinked triazine frameworks were successfully utilized to synthesize heteroatom-doped carbon nanosheets utilizing g-C3N4 nanosheets as the hard template and porogen. Characterization studies show that the nanosheets were highly crinkled and interconnected with a large surface area (1060 m2 g−1) and pore volume (2.14 cm3 g−1), and with highly dispersed N, O and S. After coating them on commercial Celgard separators, batteries with the modified separators showed a low self-discharge and an improved rate performance even at 4 C. At 0.5 C, the initial discharge capacity was 1240 mA h g−1 with a capacity decay of 0.059% per cycle for over 1000 cycles. Moreover, excellent cycling performances at 2 C for 500 cycles were also achieved. The excellent performance can be attributed to the large surface area and porous structure of NOS-C, the superior wettability toward the electrolyte, enhanced Li+ diffusion, strong interactions between polysulfides and doped atoms, and the accelerated redox kinetics of polysulfides.
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Hui Yang,Hao Chen,Wenhua Zhou,Haoan Fan,Chao Chen,Yixuan Sun,Jiaji Zhang,Sifan Wang,Teng Guo,Jie Fu
Hydrodeoxygenation of furfural (FF) into 2-methylfuran (MF) is a significant biomass utilization route. However, designing efficient and stable non-noble metal catalyst is still a huge challenge. Herein, we reported the N, O co-doped carbon anchored with Co nanoparticles (Co-SFB) synthesized by employing the organic ligands with the target heteroatoms. Raman, electron paramagnetic resonance (EPR), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS) characterizations showed that the co-doping of N and O heteroatoms in the carbon support endows Co-SFB with enriched lone pair electrons, fast electron transfer ability, and strong metal-support interaction. These electronic properties resulted in strong FF adsorption as well as lower apparent reaction activation energy. At last, the obtained N, O co-doped Co/C catalyst showed excellent catalytic activity (nearly 100 mol% FF conversion and 94.6 mol% MF yield) and stability for in-situ dehydrogenation of FF into MF. This N, O co-doping strategy for the synthesis of highly efficient catalytic materials with controllable electronic state will provide an excellent opportunity to better understand the structure–function relationship.
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Crystals
·
2023
·Vol. 13
·期 12
·1664
·
IF 2.7
Yulong Chen,Yuan Chi,Xiao Wu,Cong Lin,Tengfei Lin,Min Gao,Chunlin Zhao,Baisheng Sa
The widespread use of pharmaceuticals and personal care products (PPCPs) in many fields has brought convenience to human lives but has also caused unavoidable environmental pollution issues. In particular, the resistance gene problem resulting from accumulating antibiotics that cannot be fully absorbed by biological individuals has been a concern; thus, it is urgent to find efficient technologies to boost the degradation efficiency of antibiotics in the environment. Here, an ε-MnO2catalyst was prepared by a novel droplet-interface-drying method and utilized as a Fenton-like catalyst for efficiently degrading ciprofloxacin (CIP). The ε-MnO2shell was formed preferentially at the gas–liquid interface and then continued to decompose into ε-MnO2with abundant O vacancies in the air-insulated microcavity. The XPS result confirms that this particular preparation method can regulate the content of O vacancies in the material. Compared with ε-MnO2samples obtained by the direct drying method (ε-MnO2-B), the catalytic performance of ε-MnO2prepared by the droplet-interface-drying method (ε-MnO2-P) is significantly improved. By activating peroxymonosulfate (PMS) with the ε-MnO2-P catalyst, the CIP degradation efficiency can reach 84.1%. The detection and analysis of reactive oxygen species (ROS) in the ε-MnO2-P/PMS oxidation system confirms that ·OH, SO4·−and1O2are the main ROS for CIP degradation. This study highlights the creation of miniature hypoxic space to regulate the content of O vacancies in ε-MnO2, providing a new idea for the synthesis of other O-vacancy-rich materials.Keywords:droplet-interface-drying method;Fenton-like oxidation;ε-MnO2;ciprofloxacin;water purification
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FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Jiaxin Chen,Jingming Zhang,Zihan Xu,Baohua Kong,Hui Wang,Jie Tang,Qian Liu,Xin Li
Resveratrol , a non-flavonoid polyphenol found mainly in red grapes and peanuts, with excellent antioxidant and protein-binding properties. This present work was aimed to systematically investigate the effects and mechanism of incorporation of different levels (0, 0.2, 0.4, 0.8, and 2.0 mM) of resveratrol on the interfacial adsorption behaviour and protein-lipid co-oxidation of whey protein isolate (WPI)-stabilised oil-in-water (O/W) emulsions. The results showed that the physical stability of the O/W emulsion was gradually enhanced with increasing resveratrol levels, which was clearly evidenced by increasing absolute ζ-potential values and decreasing droplet size. Moreover, the content of adsorbed proteins (AP) slightly increased as a function of resveratrol level, which evidenced that resveratrol could effectively modulate the interfacial adsorption behaviour of WPI in O/W emulsions. Meanwhile, molecular docking simulation showed that the resveratrol could bind to WPI through hydrogen bonding and hydrophobic interaction. Compared to unadsorbed proteins (UAP), the structural characteristics and molecular mass of AP were more affected by resveratrol, which was confirmed and characterised by electrophoresis and fluorescence. Furthermore, incorporation of resveratrol only retarded, but did not completely inhibit, protein-lipid co-oxidation of O/W emulsions under an accelerated oxidation condition, as demonstrated by oxidation stability, hierarchical cluster, and correlation analysis. Our results clearly demonstrated that the resveratrol could modulate the interfacial adsorption of WPI and retard the protein-lipid co-oxidation of WPI-stabilised O/W emulsions with enhanced storability, further broadening the application of resveratrol in the food industry.
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