NUCLEAR TECHNOLOGY
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2022
·
IF 1.667
Yanhui Wang,Qiao Jiang,Yexin Yang,Jianfeng Cheng,Chenyang Bao,Yuelong Pan,Yu Liu,Gang Yang,Yangchun Leng,Xianguo Tuo
The alteration of the morphology of bentonite, a key barrier to isolating high-level radioactive waste in deep geological repositories under long-term interaction with groundwater, was studied. Bentonite colloids were prepared from Gaomiaozi bentonite, and its various properties were analyzed by various characterization methods. The effects of various factors on the adsorption of Cs(I) and Co(II) on bentonite colloids were investigated by batch static adsorption experiments. The results showed that the colloids were mainly composed of montmorillonite and were lamellar in shape, with a zeta potential of −enton mV and an average size of approximately 209.10 nm. The adsorption of Cs(I) and Co(II) by the colloids was a rapid process, and 31.78 and 88.24 mg/g, respectively, were adsorbed at equilibrium. Pseudo-second-order kinetic fitting showed that chemisorption plays a dominant role and acid-base interactions affect adsorption by influencing the stability of colloids and the chemical form of simulated nuclides. This work can be helpful for evaluating the safety of waste repositories.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2022
·Vol. 110
·期 1
·1-7
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IF 2.807
Gu Xinfeng,Mo Huijing,Wang Lei,Zhang Lianyi,Ding Zhuhong
Transport of Cr(VI) at the presence of bentonite colloid was carried out in saturated porous media of 16–18 mesh and 40–60 mesh sand columns. Effects of flow rate, pH, ion strength, humic acid and bentonite concentrations on Cr(VI) migration were investigated. The results show that the increase of flow rate accelerated the breakthrough of Cr(VI) and BP, but the transport mass of dissolved Cr(VI) decreased by ~ 15.0% when flow rate increased to 2.5 ml min −1 . Increasing IS to 10mM resulted in decrease of Cr(VI) transport mass by 6.86%–21.4%. Increase of pH and decrease of bentonite concentration favored the transport of dissolved Cr(VI). Humic acid had little effect on transport amount of Cr at pH7. Cr(VI) transport was dominated by the dissolved Cr(VI). The transport data of dissolved Cr(VI) were well described by the two-site model. The presence of BP reduced total Cr(VI) transport mass in co-transport.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Shao-Bo Guo,Wei-Bin Zhang,Ze-Qin Yang,Shan-Shan Chai,Xian-Li Zhang,Xia Zhou,Xiong-Wei Han,Jianping Long
It has become a consensus to study transition metal phosphides with abundant earth reserves and good electrochemical properties as electrode materials for supercapacitors . Among them, cobalt phosphide is particularly attractive because of its good electrical conductivity and theoretical specific capacity. Therefore, cobalt phosphide composites were prepared by hydrothermal reaction and phosphating reaction in this paper. Due to the synergistic effect of different components and the interfacial effect between the components, the ion transport and charge transfer kinetics of the prepared Co/Co 2 P/CoP electrode are both improved, which exhibits excellent electrochemical performance. At the current density of 1 A g −1 , the prepared Co/Co 2 P/CoP electrode material has a specific capacitance of 193.3 mA h g −1 , after 6000 cycles of charge and discharge at the current density of 2 A g −1 , the specific capacitance maintains at 80 %. An asymmetric supercapacitor was assembled with the prepared material as the positive electrode and activated carbon as the negative electrode, which can provide an energy density of 37.87 W h kg −1 at a power density of 799.6 W kg −1 . At the current density of 1 A g −1 , the assembled supercapacitor can maintain 80 % of the initial specific capacitance after 5000 cycles. This provides ideas for future research on this type of energy storage materials .
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 7
·2494-2504
·
IF 6.4
Xinxu Li,Bingting Bao,Xinyu He,Guoqiang Wang,Yantang Huang,Lingyun Li,Yan Yu
Optical temperature sensing technology, especially the fluorescence intensity ratio (FIR) type sensor based on Er3+, Yb3+ co-doped up-conversion (UC) luminescent materials, presents numerous opportunities in the field of temperature detection. Various Er3+, Yb3+ co-doped fluorides and oxides have been explored for the application of temperature sensing. Most of these Er3+, Yb3+ co-doped sensing materials are phosphors, for which the high temperature phase and chemical stability is still challenging. The Er3+, Yb3+ co-doped oxide single crystal is a promising solution to explore temperature sensing materials with practical application ability. In this work, an Er3+, Yb3+ co-doped LaBMoO6 single crystal (LBMO-SC: Er3+, Yb3+) is grown through flux assisted spontaneous crystal growth technology. Compared with the Er3+, Yb3+ co-doped LaBMoO6 polycrystalline samples (LBMO-PC: Er3+, Yb3+), the LBMO-SC: Er3+, Yb3+ shows improved UC performance with enhanced light emission and prolonged luminescence lifetime. The UC performance improvement results from the more efficient energy transfer between Yb3+ and Er3+. The energy transfer efficiency from Yb3+ to Er3+ in the LBMO-PC: Er3+, Yb3+ powders sintered at 1000 °C for 15 h is 7.3%, while it is 29.7% in the LBMO-SC: Er3+, Yb3+. The strong UC luminescence of LBMO-SC: Er3+, Yb3+ extends the temperature detection range; the luminescence of 4S3/2 → 4I15/2 in LBMO-SC: Er3+, Yb3+ is still measurable even when the temperature reaches 570 K. The LBMO-SC: Er3+, Yb3+ has a maximum value of relative temperature sensitivity of 1.16% K−1 at 300 K. Finally, an optical fiber type temperature sensor with practical application capability is successfully fabricated by using LBMO-SC: Er3+, Yb3+ as the luminescence sensing medium.
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Membranes
·
2023
·Vol. 13
·期 2
·166
·
IF 4.2
Jingfeng Li,Zeyu Cao,Bo Zhang,Xinai Zhang,Jinchao Li,Yaping Zhang,Hao Duan
CO is a significant product of electrochemical CO2reduction (ECR) which can be mixed with H2to synthesize numerous hydrocarbons. Membranes, as separators, can significantly influence the performance of ECR. Herein, a series of quaternized polybenzimidazole (QAPBI) anion exchange membranes with different quaternization degrees are prepared for application in ECR. Among all QAPBI membranes, the QAPBI-2 membrane exhibits optimized physico-chemical properties. In addition, the QAPBI-2 membrane shows higher a Faraday efficiency and CO partial current density compared with commercial Nafion 117 and FAA-3-PK-130 membranes, at −1.5 V (vs. RHE) in an H-type cell. Additionally, the QAPBI-2 membrane also has a higher Faraday efficiency and CO partial current density compared with Nafion 117 and FAA-3-PK-130 membranes, at −3.0 V in a membrane electrode assembly reactor. It is worth noting that the QAPBI-2 membrane also has excellent ECR stability, over 320 h in an H-type cell. This work illustrates a promising pathway to obtaining cost-effective membranes through a molecular structure regulation strategy for ECR application.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ming Yan,Jiangtao Huang,Mengliu Yang,Hao Zhang,Yu Zhu,Nengyu Zhou,Juan Wang
MAX phases are layered ternary carbides and nitrides with unique properties, doping transition metals in it is attracting significant attentions for the processing of this relatively new class of materials. In this paper, a magnetic solid solution MAX phase V 2 (Sn 1− x A x )C ( A = Mn, Fe, Co) was synthesized by doping Mn/Fe/Co atoms into V 2 SnC by pressure-less sintering. The XRD results show that when x = 0.4, the characteristic peak shifts to the right, and the substitution reaches saturation. SEM and TEM show that doping does not change the original layered morphology and hexagonal crystal form, but only the lattice constants decrease slightly. Magnetic test results indicate that V 2 (Sn 1− x A x )C is a typical low-temperature magnetic material with a Curie temperature around 60 K, and the magnetization increases with the increase of doping amount. Moreover, we explained the reasons of V 2 SnC doping A-site instead of M-site and the changing trend of the magnetic moments by first-principles calculations, which are consistent with the experimental results.
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Nano Today
·
2023
·
IF 17.4
Xi Liu,Xizi Wan,Lianxin Shi,Bing Dai,Man Yang,Xuetao Xu,Wuyi Xiao,Xiao He,Lei Jiang,Shutao Wang
Developing omni-adhesives is a great challenge for those oil/water wetted substrates because the interfacial liquid always restricts the contact area between adhesives and substrates. Herein, we report omni-adhesive fibers composed of oilborne core-fiber and waterborne semi-nanoshell via Taylor-cone co-electrospinning, realizing efficient adhesion on diverse liquid wetted substrates with cold tolerance. The oilborne core-fiber and waterborne semi-nanoshell enable the omni-adhesive fibers to adhere onto solid substrates wetted by diverse liquids, such as aqueous solutions with acid, base and salts, organic solvents and daily drinks, through a partial dissolving-wetting-adhering process. Further, the formed nano-adhesive layer of omni-adhesive fibers shows wide-range temperature tolerance from −196–60 ℃. As a proof-of-concept study, we demonstrate a temperature monitor based on omni-adhesive fibers can indicate the temperature fluctuation of cold-supply chain, such as vaccine transport. This study provides a feasible route to design omni-adhesives adaptive to complex liquid wetted substrates in large temperature fluctuations.
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Materials
·
2023
·Vol. 16
·期 2
·503
·
IF 3.4
Binxiao Wei,Chen Yu,Yongping Bai,Li Liu,Jinmei He
As the requirements of aerospace technology become more rigorous, the performance of solid rocket motor (SRM) cases needs to be further optimized. In the present study, a co-curing technique was used to fabricate carbon fiber reinforced polymer (CFRP)/ethylene-propylene-diene monomer (EPDM) composites whereby the properties of CFRP/EPDM composites were adjusted by varying the temperature, heating time and type of vulcanizing agent to obtain the optimum manufacturing process. The results of crosslink density (3.459 × 10−4mol/cm3) tested by nuclear magnetic resonance (NMR), a 90° peel strength test (2.342 N/mm), and an interlaminar shear test (ILSS = 82.08 MPa) demonstrated that the optimum mechanical properties of composites were obtained under the temperature 160 °C heated for 20 min with the curing agent DCP/S. The interfacial phase and bonding mechanism of composites were investigated by scanning electron microscopy (SEM). Thermogravimetric analysis (TGA) further indicated that EPDM/DCP/S had favorable thermal stability. This will provide valuable recommendations for the optimization of the SRM shell preparation process.Keywords:carbon fiber reinforced polymer;epdm;co-curing;preparation optimization
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2023
·
IF 5.8
Qiang Huang,Zhiren Zou,Xiaobo Li,Qinwen Xiao,Guang Liang,Wenqi Wu
The drug-amino acid co-amorphous systems and amorphous solid dispersions (ASDs) are promising methods to address the poor water solubility of poorly water-soluble drugs. However, some amino acids might not be perfect co-formers for co-amorphous systems, and the relatively low drug-loading of many ASDs is one of the main disadvantages of ASDs. Thus, poly- l -lysine and polyglutamic acid were selected as the co-formers, ball milled with basic mebendazole, neutral tadalafil and acidic valsartan at different weight ratios (from 3:1 to 1:3) to prepare poly (amino acid)-based ASDs, aiming to combine the advantages of co-amorphous systems (high drug-loading) and ASDs (relatively high T g and high physical stability). All the mixtures were converted into amorphous after milling. The powder dissolution studies showed that drug-poly (amino acid) ASDs improved the dissolution rate of the drug in different ways and to different degrees. Moreover, the two poly (amino acid)s enhanced the physical stability of amorphous drugs. It is worthy to mention that the salt formation between the drug and the poly (amino acid) does not necessarily mean better performance compared to non-salt forming systems, and salt formation is also not a prerequisite for the formation of promising drug-poly (amino acid) ASDs.
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Journal of Water Process Engineering
·
2023
·
IF 7
Jiawei Li,Jie Jin,Yunao Zhao,Ziwei Zou,Yunchao Wu,Jintao Sun,Jinxia Xia
The renewable utilization of phosphorus (P) in sewage sludge is greatly hindered by its low bioavailability . In this study, the co-hydrothermal treatment (co-HTT) of sewage sludge and biomass was conducted to enhance P bioavailability. The dehydration and decarboxylation of sludge organic matter were promoted by co-HTT as evidenced by FTIR and elemental analysis. XPS and XRD results showed that co-HTT facilitated the formation of Al/Fe phosphates in sludge. The results of Hedley's sequential extraction demonstrated that HTT at low temperatures (≤ 155 °C) enlarged the relative abundance of bioavailable P in the sludge from 72 % to as high as 80 % because of the decomposition of organic P. In contrast, at a high temperature of 185 °C, more bioavailable P was converted into insoluble and residual forms. The addition of rice straw in sludge during HTT resulted in a two-fold increase in exchangeable P content, suggesting that rice straw can effectively improve sludge P bioavailability. Cellulose exhibited less influence on sludge P bioavailability than lignin. After lignin addition, the relative abundance of bioavailable P in the sludge was further increased to 91 %, which could be attributed to the greater enhancement effect of lignin on the decomposition of sludge organic matter. These findings reveal that the co-HTT of sludge and lignin-containing biomass may be an effective strategy for improving sludge P bioavailability.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qibang Tong,Congyi Li,Guixin Wang,Yao Wang,Shuo Peng,Jihang Wang,Bo Lai,Yong Guo
The abuse of antibiotics has drawn wide attention owing to their potential risk in human health and ecosystem. As one of the most commonly used sulfonamide antibiotics, sulfamethoxazole (SMX) can hardly be removed by conventional wastewater treatment methods, and thus it has become one of the most frequently detected antibiotics in water environment. In this study, a new cobalt-based heterogeneous catalyst (Co-bHAP) was successfully prepared using the simple impregnation method with animal bone-derived hydroxyapatite (bHAP) as the support, and applied to activate peroxymonosulfate (PMS) for the degradation of SMX in water. The physicochemical properties of Co-bHAP catalyst were investigated by series of characterization methods, and the results showed that this catalyst has a rough and porous morphological structure, as well as homogeneously distributed active component, which is mainly in the form of Co 3 O 4 . The developed Co-bHAP can provide abundant reaction active sites and exhibit excellent catalytic activity and stability in PMS activation . The kinetic constant of Co-bHAP activating PMS to degrade SMX is up to 0.1524 min −1 , which is 4.5 times larger than that of bare Co 3 O 4 . The SMX (20 mg/L) degradation efficiency within 30 min in Co-bHAP/PMS system reached as high as 98.7% and still maintained at 86% after 5 times consecutive operation, with slight cobalt ions leaching less than 0.1 mg/L. Based on radical quenching experiment, electron paramagnetic resonance (EPR) test and XPS analysis, the reaction mechanism was proposed. The balance among Co 3+ / Co 2+ , O 2− /O 2 and PMS decomposition in Co-bHAP/PMS system ensured the continuous generation of sulfate radical (SO 4 •– ) and hydroxyl radical (HO • ), both of which are responsible for SMX degradation, while SO 4 •– plays a leading role. In addition, four possible pathways of SMX degradation were proposed according to the eight detected intermediate products. All the results suggested that this catalyst could have a promising potential in activating PMS to degrade sulfonamide antibiotic pollutants in water.
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GIANT
·
2023
·
IF 7
Ze Wang,Xiangqian Li,Fengfeng Feng,Chengyang Hong,Zhiyan Sun,Wei Tian,Kun Yu,Hao Liu
Inorganic-organic hybridization is a widely used method to develop new functional materials involving polyoxometalates (POMs), affording them with unique synergistic physical and chemical properties. As one of the core topics in hybrid materials, the study of their assembly structures is critical for the optimization of their performances. In the present work, dynamic co-assembly behaviors of several giant surfactants XPOSS-PS (X, POSS and PS denote different polar groups, polyhedral oligomeric silsesquioxane and polystyrene, respectively) and Keggin-type silicotungstic acid H 4 SiW 12 O 40 ( H 4 SiW for short) were investigated. We designed and synthesized three series of giant surfactants that possess heads bearing cationic ( NPOSS-PS , N for ammonium group), neutral ( DPOSS-PS , D for dihydroxyl group) and anionic charges ( APOSS-PS , A for carboxylic acid group), respectively. The different charge types of POSS heads lead to different electrostatic interactions with the anionic POM clusters, resulting in different co-assembly structures in dual mixed solvents. Moreover, we found the POM's loading content and PS chain length are another two important factors that can determine the morphology of co-assembly structures. This work expands the scope of co-assembled structures of POM-based hybrid materials, and provides a platform for the study of the basic physical principles of their co-assembly behaviors.
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