JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Jianfei Xiao,Yuan Wang,Tian C. Zhang,Shaojun Yuan
A novel porous carbon derived from glucose and dicyandiamide incorporated with reduced graphene oxide (rGO) was prepared for CO 2 capture and supercapacitors . In this synthesis, one-pot hydrothermal and KOH activation were employed to obtain reducing graphene oxide/N-doped porous carbon (rGO/NPC) composites. Among the rGO/NPC composites derived, the sorbent rGO/NPC-600-2-1 (1 represents the addition amount of graphene oxide is 1% of the total mass of glucose and dicyandiamide, 2 represents the mass ratio of potassium hydroxide to the precursor of carbon composite material is 2 and 600 means activation temperature is 600 °C) had a large surface area of 865.1 m 2 g −1 , a rich nitrogen doping amount of 7.07 wt%, and a high CO 2 capture ability of 5.77 mmol/g at 298 K. Additionally, the as-synthesized rGO/NPC-600-2-1 was used as a supercapacitor electrode, providing a specific capacitance 210.8 F g −1 in 6 M KOH electrolyte under ambient conditions and excellent charge and discharge long cycle stability (circa 100% capacitance retention at a current density of 10 A g −1 after 10000 cycles). Even at a high current density of 20 A g −1 , a capacity of 141.1 F g -1 is still maintained. The results above suggested that the rGO/NPC composites are applicable candidates for both electrochemical energy storage and CO 2 capture.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Jing Pan,Shaobin Li,Fengbo Li,Tingting Yu,Yupeng Liu,Li Zhang,Lin Ma,Ming Sun,Xuefeng Tian
Metal-organic frameworks (MOFs)-based derivatives provide a flexible platform for constructing high performance supercapacitors as electrode materials. Herein, a novel NiFe 2 O 4 /NiCo 2 O 4 /GO composites has been successfully prepared by dual-MOF as precursor. The NiFe 2 O 4 /NiCo 2 O 4 /GO composite formed a special structural morphology providing a large surface area. The composite electrode material exhibited an excellent specific capacity of 661.6 C/g (1470 F/g) at 1 A/g, excellent rate capability (from 1 to 20 A/g the specific capacity decreases about 38 %) and outstanding long cyclic life (89.9 % capacity retention after 3000 cycles). Moreover, an asymmetric supercapacitor was composed of NiFe 2 O 4 /NiCo 2 O 4 /GO and activated carbon as positive electrode and negative electrode, respectively. Meanwhile, ASC exhibited a specific capacity of 373.3 C/g at 1A/g in a potential range from 0 to 1.45 V, it showed the maximum energy density of ASC equal to 109 Wh kg −1 at a power density of 1051.17 W kg −1 . In addition, the NiFe 2 O 4 /NiCo 2 O 4 /GO//AC has an outstanding cycling stability (90.7 % capacitance retention after 1000 cycles), which makes it a potential application for in the field of energy storage-conversion application.
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EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
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2020
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IF 3.616
Xiaoyu Zhang,Junping Zheng,Nan Jiang,Guangjun Sun,Xinkun Bao,Mingwang Kong,Xue Cheng,Aizhen Lin,Hongtao Liu
Lactulose is a common laxative and has been widely applied to clinical treatment for constipation. This study aimed to explore the improving effect of lactulose on constipation through the mediation of gut microbiota and intestinal metabolites. BALB/c mice with constipation induced by loperamide were orally treated with lactulose for four weeks. After the treatment, the constipation-related factors were determined. The effect of lactulose on the composition of gut microbiota was assessed by 16S rDNA gene sequencing. Gas chromatography or liquid chromatography-mass spectrometer (GC/LC-MS) analysis was used for the quantification of intestinal metabolites. The treatment of constipated mice with lactulose accelerated intestinal motility, suppressed inflammatory responses, protected gut barrier, and improved metabolisms of water and salt in the intestinal tract. These therapeutic effects were attributed to the reversed gut microbiota dysfunction, which conferred the benefit to the production of intestinal metabolites including bile acids, short-chain fatty acids, and tryptophan catabolites. Further, the depletion of intestinal flora from loperamide- or (loperamide + lactulose)-treated mice confirmed the significance of gut microbiota in the mediation of constipation. In summary, this study leads us to propose that lactulose may improve constipation through a prebiotic effect on gut microbiota and intestinal metabolites.
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高影响因子
Journal of Environmental Sciences
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2020
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IF 4.302
Kai Liu,Fangbai Li,Qingwen Tian,Chengrong Nie,Yibing Ma,Zhenlong Zhu,Liping Fang,Yuanying Huang,Siwen Liu
Paddy soil and irrigation water are commonly contaminated with hexavalent chromium [Cr(VI)] near urban industrial areas, thereby threatening the safety of agricultural products and human health. In this study, we develop a porous and high specific area bone char (BC) to support nanoscale zero-valent iron (nZVI) and apply it to remediate Cr(VI) pollution in water and paddy soil under anaerobic conditions. The batch experiments reveal that BC/nZVI exhibits a higher removal capacity of 516.7 mg/(g•nZVI) for Cr(VI) than nZVI when normalized to the actual nZVI content, which is 2.8 times that of nZVI; moreover, the highest nZVI utilization is the nZVI loading of 15% (BC/nZVI15). The Cr(VI) removal efficiency of BC/nZVI15 decreases with increasing pH (4 – 10). Coexisting ions (phosphate and carbonate) and humic acid can inhibit the removal of Cr(VI) with BC/nZVI15. Additionally, BC exhibits a strong advantage in promoting Cr(VI) removal by nZVI compared to the widely used biochar and activated carbon. Our results demonstrate that reduction and coprecipitation are the dominant Cr(VI) removal mechanisms. Furthermore, BC/nZVI15 shows a significantly higher reduction and removal efficiency as well as a strong anti-interference ability for Cr(VI) in paddy soil, as compared to nZVI. These findings provide a new effective material for remediating Cr(VI) pollution from water and soil.
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FUSION ENGINEERING AND DESIGN
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2021
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IF 1.453
Maoqiao Xiang,Jie Zheng,Shaofu Li,Chaoquan Hu,Jingyi Cui,Yingchun Zhang,Qiang Qi,Fen Yue
Lithium-based ceramic tritium breeders would attack the blanket structural materials and produce brittle corrosion layers, causing potential safety hazard. Herein, coated breeders were proposed as advanced tritium breeders to address the issue. Carbon (C), titanium nitride (TiN) and titanium carbide (TiC) were investigated as inert protective shells because they show excellent stability and chemical compatibility with Li 2 TiO 3 and Li 4 SiO 4 . Moreover, for the first time, the C and TiN coated Li 2 TiO 3 and Li 4 SiO 4 pebbles were successfully fabricated by fluidized bed chemical vapor deposition (FBCVD) process, which would significantly decrease the brittle corrosion layers and increase the safety. The deposition behavior and interface reactions were systemically investigated.
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ENVIRONMENTAL TECHNOLOGY
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2020
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IF 2.213
Fan Xia,Haifeng Yang,Li Li,Yang Ren,Dezhi Shi,Hongxiang Chai,Hainan Ai,Qiang He,Li Gu
This paper used cetyltrimethylammonium chloride (CTAC) pre-loaded activated carbon (AC) to research nitrate adsorption. Effects of various parameters such as AC types, AC dosage as well as initial pH were studied. The results indicated that the ACs modified by CTAC can get higher nitrate removal. Even pH is neutral and basic, an accepted removal about 2.5 mg/g can be observed. The more CTAC pre-loaded on the AC surface, the higher nitrate adsorption capacity can be obtained. pH is regarded as a key factor affecting interactions between adsorbent and adsorbate, and the results confirmed that the nitrate adsorption on modified AC decreases gradually with the growth of initial pH. Besides, the acidic pH condition is much favoured for adsorption while the results gained a nitrate adsorption about 4.28 mg/g at pH = 3 condition. Sorption mechanism of nitrate on CTAC modified AC was investigated through two kinetic modellings including pseudo-second-order and Weber and Morris intra-particle diffusion model. The results imply that the generalized kinetic models tally well with experimental data. Additionally, interference of co-existing anions is examined, and the results showed that higher co-anions concentration would bring a heavier depression of the nitrate uptake due to its competing for adsorption sites.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2020
·Vol. 101
·期 9
·3605-3612
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IF 2.614
Lipeng Han,Jiahui Li,Shujie Wang,Weiwei Cheng,Lukai Ma,Guoqin Liu,Dongxue Han,Li Niu
BACKGROUND Glycidyl esters (GEs) have attracted worldwide attention for their potential harm to human health. The GEs in edible oils mainly form during the deodorization of the oil refining processes. We used sesamol and sesamolin to inhibit the formation of GEs in model corn oil (MCO), model palm oil (MPO) and model rice bran oil (MRO) during a deodorization process. RESULTS The results showed that, in the three model oils, the total GE content was in the following order from highest to lowest: MRO (1437.98 μg kg −1 ) > MPO (388.64 μg kg −1 ) > MCO (314.81 μg kg −1 ). The inhibitory effect of the three antioxidants on the formation of GEs in the MCO was in the following order from strongest to weakest: tert-butylhydroquinone (TBHQ) > sesamol > sesamolin. CONCLUSION When the mass percentage of sesamol was 0.05%, its inhibition percentage on GEs was close to the inhibition percentage of 0.02% added TBHQ. The present study provides a foundation for understanding how to inhibit the formation of GEs in oils by adding sesamol during the deodorization process.
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Micro & Nano Letters
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2020
·Vol. 15
·期 13
·938-942
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IF 0.975
Pengjiao Zhang,Wei Li
Copper oxide/manganese dioxide (CuO/MnO 2 ) nanocomposites were prepared by a facile microwave-assisted synthesis method in an ordinary household microwave oven and used for electrochemical supercapacitor. The nanocomposites were characterised by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. Electrochemical results demonstrate that CuO/MnO 2 nanocomposites have better capacitance performance than pure CuO material. The CuO/MnO 2 nanocomposites have a high specific capacitance of 499.0 F/g at a current density of 0.5 A/g in 6 M KOH electrolyte. In addition, an asymmetric supercapacitor with activated carbon as a negative electrode and CuO/MnO 2 nanocomposite as a positive electrode was also successfully prepared. This asymmetric device exhibits a high energy density of 32.07 Wh/kg at a power density of 375.02 W/kg and fairly good cycling stability.
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Journal of Materials Chemistry A
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2020
·Vol. 8
·期 44
·23344-23353
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IF 11.301
Pengfei Zhai,Na Peng,Zeyu Sun,Wenjia Wu,Weijie Kou,Guoshi Cui,Kang Zhao,Jingtao Wang
The development of thin solid-state electrolyte with high ionic conductivity and mechanical strength is of great importance for the high-performance all-solid-state lithium–sulfur battery. However, the state-of-the-art solid polymer electrolyte suffers from poor ionic conductivity and a high thickness but inferior mechanical strength. Herein, a thin laminar composite solid electrolyte (LCSE), namely Vr/PEO-LCSE, is fabricated by filtrating vermiculite nanosheets, followed by intercalation of PEO–LiTFSI into the interlayer through a swelling and filtration method. The continuous interlayer channels with improved PEO chain motility and LiTFSI dissociation afford Vr/PEO-LCSE a highly enhanced ionic conductivity of 1.22 × 10−5 S cm−1 at 25 °C. Together with the low thickness (10 μm), Vr/PEO-LCSE achieves an ultralow area-specific resistance of 66 Ω cm2 at 30 °C, about 50 times lower than pure PEO. Meanwhile, the typical brick-and-mortar architecture combined with the strong rigidity of vermiculite nanosheet imparts Vr/PEO-LCSE an excellent compressive strength of 131 MPa, 550% higher than that of pure PEO. As a result, the rate performance of the assembled Li–S battery is significantly improved. The Li|Vr/PEO-LCSE|S cell achieves low capacity fading as current density increases from 0.05C to 0.20C, and the discharge capacity recovers to 1100 mA h g−1 when the current density switches back to 0.05C.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Qi Dong,Dongxu Yang,Liang Luo,Qiang He,Fangheng Cai,Si Cheng,Yi Chen
Chronic accumulation of fluoride (F − ) threats human health and eventually brings about skeletal fluorosis, dental fluorosis and joint deformation, which has aroused global attention. As an emerging technique, electrosorption presented great potential in wastewater purification. The key role in electrosorption is the exploitation of economical, environmentally-friendly and efficient electrode material. Nowadays, many existing investigations on the preparation of porous carbon material focused on the introduction of extra dopant and activation reagent. However, the information concerning the preparation of pure porous biochar and the inherent environmental significance is neglected. Here, a win–win strategy, named conversion waste biomass into porous biochar, has been applied in capacitive fluorine removal. The results indicated that the capacity of porous biochar electrode was 1.28 mg/g, which was improved by 48.8% in contrast to activated carbon electrode. Furthermore, competition experiments revealed concentration-dependence interference in the present of foreign ions. Electrosorption cycle experiment manifested excellent stability of the biochar electrodes. The electrode was regenerated without consuming any chemicals and could produce current for energy recovery. More importantly, continuous-flow experiment showed that the removal efficiency of F − was 91.98% at the synthetic wastewater. High specific capacitance, low internal resistance and appropriate pore distribution were responsible for the F − removal mechanism. Overall, this work would pioneer a facile method in the preparation of low-price electrode material and their potential applications in environmental remediation.
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ACS Nano
·
2021
·
IF 15.881
Xiaodong Zhu,Ziyi Cao,Wenjie Wang,Haijing Li,Juncai Dong,Shangpeng Gao,Dongxiao Xu,Lei Li,Jianfeng Shen,Mingxin Ye
Mn-based aqueous zinc-ion batteries (ZIBs) are promising candidate for large-scale rechargeable energy storage because of easy fabrication, low cost, and high safety. Nevertheless, the commercial application of Mn-based cathode is hindered by the challenging issues of low rate capability and poor cyclability. Herein, a manganese–vanadium hybrid, K–V2C@MnO2 cathode, featured with MnO2 nanosheets uniformly formed on a V2CTX MXene surface, is elaborately designed and synthesized by metal–cation intercalation and following in situ growth strategy. Benefiting from the hybrid structure with high conductivity, abundant active sites, and the synergistic reaction of Mn2+ electrodeposition and inhibited structural damage of MnO2, K–V2C@MnO2 shows excellent electrochemical performance for aqueous ZIBs. Specifically, it presents the high specific capacity of 408.1 mAh g–1 at 0.3 A g–1 and maintains the specific capacity of 119.2 mAh g–1 at a high current density of 10 A g–1 in a long-term cycle of up to 10000 cycles. It is superior to almost all reported Mn-based cathodes for ZIBs in the aqueous electrolyte. The superior electrochemical performance suggests that the Mn-based cathode materials designed in this work can be a rational approach to be applied for high-performance ZIBs cathodes.
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Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Yangyi Xiao,Xun Wang,Chenxing Li,Huan Peng,Tuqiao Zhang,Miaomiao Ye
Recently, great efforts have been focused on solar evaporators because they can localize solar heat on the air-water interface resulting in enhanced photothermal conversion efficiency. However, to prevent salt accumulation during evaporation while maintaining high evaporation rates is still a challenge. In this work, a salt-rejecting solar evaporator was fabricated for continuous seawater desalination. The evaporator was composed of a top layer of carbon black (CB) nanoparticles for solar absorbance, an interlayer of superhydrophilic melamine formaldehyde (MF) foam for both seawater and concentrated brine delivery, and an outlayer of expandable polyethylene (EPE) foam for floating and heat insulation. The superhydrophilic MF foam could offer a channel for rapid exchange of the concentrated brine with the solution beneath, thereby preventing salt accumulation in the evaporator. It was demonstrated that the salt-rejecting solar evaporator produced a high water evaporation rate of 1.24 kg·m −2 ·h −1 under 1 kW·m −2 solar irradiance, which was 3.2 times higher than that of the pristine simulated seawater (3.5 wt% NaCl solution). Furthermore, the salt-rejecting evaporator displayed an excellent stability as the water evaporation rate remained constant even after 16-cycles of use within 20 days.
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