Journal of Materials Chemistry A
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2020
·Vol. 8
·期 16
·7775-7783
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IF 11.301
Lvye Dou,Xiaota Cheng,Xinxin Zhang,Yang Si,Jianyong Yu,Bin Ding
Industrial thermal energy management or space exploration requires thermal insulating materials with features of low thermal conductivity, low bulk density and robust mechanical properties. However, the use of traditional organic insulation materials is hampered by their poor fire resistance while inorganic insulation ones are either stiff or display a high thermal conductivity. Herein, we design and synthesize binary-network structured silica nanofibrous aerogels (BSAs) by in situ assembly of nanoporous silica aerogels on a cellular structured silica fibrous framework. The resulting BSAs can completely recover from 80% compressive strain, displaying temperature-invariant superelasticity and robust fatigue-resistance up to 100 000 compression-release cycles. Moreover, the unique binary-network structure provides BSAs with ultralow thermal conductivity (21.96 mW m−1 K−1), robust fire retardancy, and superior high-temperature thermal insulation performance. BSAs with a thickness of 20 mm are shown to protect bare hands placed on the opposite side, when directly exposed to butane blowtorch flame (∼1000 °C). These superior performances lead to their appealing practical application potential in energy management, thermal isolation or fire protection fields.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Xu Jing,Xiaoyu Cheng,Wenfei Zhao,Huihui Wang,Xiaowen Wang
A method for the determination of triazine herbicides in water samples was established by magnetic effervescence tablet-assisted switchable hydrophilicity solvent-based liquid phase microextraction procedure (META-SHS-LPME) coupled with high-performance liquid chromatography with diode array detection. The magnetic effervescence tablet, composed of citric acid , sodium hexanoate, sodium bicarbonate, and Fe 3 O 4 nanoparticles , combined extractant generation, dispersion, and magnetic recovery into one step. Citric acid could react with sodium hexanoate and sodium bicarbonate to generate hexanoic acid and carbon dioxide in situ , respectively. Carbon dioxide bubbles assisted the eco-friendly extractant hexanoic acid to fully contact with target compounds. Fe 3 O 4 nanoparticles containing extractant and triazine herbicides were isolated from the sample solution using an external magnet. Good linearity was achieved in the range of 50–5000 ng mL −1 with a correlation coefficient greater than 0.997. The limit of detection was within 0.10–0.13 ng mL −1 . The extraction recovery of triazine herbicides were 81.4–96.7% in well, pond, and river waters. Overall, the proposed method was a simple, efficient, and eco-friendly analytical approach for determining triazine herbicide residues in water samples.
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ELECTROCHIMICA ACTA
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2020
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IF 6.215
Tong Wu,Guiru Sun,Wei Lu,Liping Zhao,Alain Mauger,Christian M. Julien,Liqun Sun,Haiming Xie,Jinghai Liu
The inhibition of the shuttle of lithium polysulfides (LiPSs) and enhancement of the electrical conductivity of the cathodes are desirable to improve the performance of lithium-sulfur batteries. In the present work, we report a cathode acting simultaneously as a highly efficient LiPSs immobilizer and sulfur host. It is composed of sulfur embedded inside a hollow sphere, the shell of which is made of hollow black TiO 2 (b-TiO 2 ) spherical nanoparticles . The particles of the composite are then coated with a polypyrrole (PPy) layer to form the active cathode element (b-TiO 2 /S@PPy). The particular topology of the b-TiO 2 layer provides enough space to alleviate the volume expansion of LiPSs. Equally, the PPy coating layer can not only improve the conductivity of the cathodes, but also restrain the shuttle of LiPSs by chemical adsorption . With the sulfur content of 59.6 wt% corresponding to a sulfur loading of 1.5–1.8 mg cm −2 , the lithium-sulfur batteries with the b-TiO 2 /S@PPy cathode exhibits a high initial discharge capacity (1374 mAh g −1 at 0.1C), a superior cycling stability (910 mAh g −1 after 200 cycles at 0.1C), and a good rate performance (725 mAh g −1 at 2C).
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Nano Energy
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2020
·
IF 16.602
Dan Zhang,Yan Ren,Xia Fan,Jin Zhai,Lei Jiang
Natural sunlight is one kind of renewable energy that is considered likely to be ubiquitous at the river-sea junction. Ingeniously engineering a photoassisted enhanced electricity capture facility based on an artificial nano-porous membrane, is a necessity. Herein, a proof-of-concept system is constructed, wherein cation-selective photoresponsive porphyrin/alumina nanochannels are entrusted with cationic selectivity and extraordinary photoelectric response, thus it is available to synergistically convert salinity gradient and solar energy into high electric energy. Depending solely on excellent cationic selectivity of nanochannels, the salinity-gradient-driven membrane system can capture high power output of 2.16 W/m 2 . And harvested power of the generator with the help of photo is elevated to 4.56 W/m 2 . Resulted total transmembrane ionic current ( I total ) is traceable to a smooth cooperative effort of diffusion current ( I diff ) and photo-induced ionic current ( I photo ). Benefiting from the accumulation characters of ionic current, the electricity generator with the modulation of concentration gradient and varying-intensity photo stimulus can achieve a multivalued conduction including current and power increase. The general nanofluidic system paves the way for other multi-functional membranes that simultaneously utilize various clean sources to potentially improve entire electricity output.
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Frontiers of Environmental Science & Engineering
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2020
·Vol. 14
·期 3
·1-13
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IF 4.053
Jiang Chaojin,Jiang Xiaoqian,Zhang Lixun,Guan Yuntao
A new technique of zero-valent zinc coupled with ascorbic acid (ZVZ/AA) was developed and applied to debrominate the 2,2′,4,4′-Tetrabromodiphenyl ether (BDE-47), which achieved high conversion and rapid debromination of BDE-47 to less- or non-toxic forms. The reaction conditions were optimized by the addition of 100 mg/L ZVZ particles and 3 mmol/L AA at original solution pH = 4.00 using the solvent of methanol/H 2 O (v:v = 4:6), which could convert approximately 94% of 5 mg/L BDE-47 into lower-brominated diphenyl ethers within a 90 min at the ZVZ/AA system. The high debromination of BDE-47 was mainly attributed to the effect of AA that inhibits the formation of Zn(II)(hydr)oxide passivation layers and promotes the corrosion of ZVZ, which leads to increase the reactivity of ZVZ. Additionally, ion chromatography and gas chromatography mass spectrometry analyses revealed that bromine ion and lower-debromination diphenyl ethers formed during the reduction of BDE-47. Furthermore, based on the generation of the intermediates products, and its concentration changes over time, it was proposed that the dominant pathway for conversion of BDE-47 was sequential debromination and the final products were diphenyl ethers. These results suggested that the ZVZ/AA system has the potential for highly efficient debromination of BDE-47 from wastewater.
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Inorganic Chemistry Frontiers
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2020
·Vol. 7
·期 5
·1289-1297
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IF 5.958
Zhaoyang Wang,Jinmei Liu,Zijuan Du,Haizheng Tao,Yuanzheng Yue
Na3V2(PO4)3 (NVP) features a three-dimensional open structure, which allows fast migration of Na+ ions, and thus, NVP is a superior cathode material for sodium ion batteries. However, the application of the NVP cathode is limited by its low electronic conductivity. To overcome this limitation, we developed an NVP nanocomposite cathode by doping carbon with bromine (Br) and nitrogen (N) during the sol–gel assisted hydrothermal reaction. The Br- and N-doping leads to the formation of amorphous carbon (a-C) on the surface of NVP particles. The nanocomposite possesses multilevel structures containing both pores with different sizes and aggregated grains (200–300 nm). Since the doped N provides electrons to the carbon matrix, the electronic conductivity of the nanocomposite is enhanced. Br-Doping leads to the drop of activation energy for V4+/V5+ redox reaction. The nanocomposite cathode exhibits a high reversible capacity of 41 mA h g−1 at 10C. Both the superior rate and cycling performances could be attributed to the synergistic effect of the multilevel structure and amorphous carbon.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2020
·Vol. 324
·期 2
·715-729
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IF 1.137
Wei Hongfu,Dong Faqin,Chen Mulan,Zhang Wei,He Miao,Liu Mingxue
As jarosite and oxalic acid are ubiquitous in nature, we investigated a remediation technology for uranium-contaminated site by photoinduced reduction coupled with adsorption of jarosite. Jarosite exhibited excellent adsorption properties for uranium, with a highest adsorption capacity 453.98 mg g −1 . With the presence of oxalic acid, U(VI) was removed at a reduction ratio of 30.71% under irradiation. It may be that oxalic acid promoted the reduction of Fe(III) to Fe(II) in jarosite, and then Fe(II) reduced U(VI) to U(IV). The results confirmed the applicability of the remediation by adsorption using jarosite and light-induced reduction.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2020
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IF 2.627
Dongmei Jia,Huamin Cai,Yongzheng Duan,Jiangbao Xia,Jia Guo
Chromium is a common harmful pollutant with high toxicity and low bearing capacity of soil and water. Excellent salinity resistance, a wide pH range, and high regeneration capacity were essential for qualified adsorbents used in removing hexavalent chromium (Cr(VI)) from polluted water. Herein, iron oxalate modified weak basic resin (IO@D301) for the removal of Cr(VI) was prepared by the impregnation method. The IO@D301 was characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Owing to abundant amine, carboxyl groups and iron ions existing on the surface, IO@D301 possesses high adsorption and salinity resistance capacity for Cr(VI). The maximum adsorption capacity of IO301 towards Cr(VI) reached 201.30 mg·g −1 at 293 K and a pH of 5. The adsorption equilibrium was well fitted by the Freundlich model, and the adsorption process was described by the pseudo-first-order kinetics model as spontaneous and exothermic. The mechanism may be identified as electrostatic attraction, coordination, and reduction, which was confirmed by FT-IR and X-ray photoelectron spectroscopy.
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 26
·11076-11084
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IF 3.288
Yin'an Zhu,Ye Pan,Enming Zhang,Weiji Dai
Hetero-junctions are widely considered as efficient and promising separators for photogenerated electron–hole pairs in photocatalytic processes. In this work, a self-assembled urchin-like TiO2@Ag–CuO hetero-junction was fabricated via a two-step approach combining a dealloying method with calcination using alloy ribbons as the precursors. This nanostructure exhibits enhanced degradation efficiency toward tetracycline hydrochloride (TC) under visible light irradiation, achieving a degradability of 82.86% after 3 hours, higher than those of P25, CuO, TiO2@Ag and TiO2@CuO binary hetero-junctions. The photocurrent response and electrochemical impedance spectroscopy studies reveal that the TiO2@Ag–CuO hetero-junction possesses an excellent separation ability and a long lifespan with regard to photogenerated electron–hole pairs, which may contribute to its enhanced photocatalytic ability. In addition, this unique nanostucture maintained good degradation stability even after four-cycle utilization. The findings of this work provide new ideas to prepare multicomponent hetero-junctions for water purification.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Yue Yin,Mengqi Shi,Yi Ren,Shu Wang,Ming Hua,Junhe Lu,Weiming Zhang,Lu Lv
A novel multifunctional metal-organic frameworks (MOFs) UiO-66@Fe 3 O 4 @UiO-66 (UiO = University of Oslo) was fabricated to adsorb pharmaceuticals and personal care products (PPCPs) under near neutral conditions. We designed a wrinkle structure on the surface of UiO-66@Fe 3 O 4 @UiO-66 by seeded growth strategy. These wrinkles were composed of Fe 3 O 4 nanoparticles and outermost UiO-66. It made the specific surface area of the MOFs increases, and provided multiple active sites for a representative pollutant salicylic acid (SA) adsorption. Moreover, lattice defects formed during secondary growth facilitating the coordination interaction between SA and the secondary building unit of UiO-66@Fe 3 O 4 @UiO-66 under near neutral conditions. These advantages made the adsorption capacity of per unit mass UiO-66 in UiO-66@Fe 3 O 4 @UiO-66 about 42% higher than that of the pristine UiO-66, and the removal rate of 1 mg L −1 SA reach 64.5% in real wastewater. Furthermore, magnetic Fe 3 O 4 particles in the wrinkles exhibited outstanding magnetic separation performance. So that UiO-66@Fe 3 O 4 @UiO-66 can be effectively separated from the liquid media and regenerated after adsorption. The results show that the wrinkled MOFs could be used as an excellent candidate for SA adsorption in real wastewater. More importantly, this strategy could guide the preparation of different kind of MOFs to adsorb PPCPs in wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yue Wang,Bin-Bin Chen,Ya-Ting Gao,Lei Jiang,Jian Lv,Shuai Chang,Ruo-Can Qian,Da-Wei Li
Excellent photocatalysts are highly desirable for clean energy and pollutant treatment. Carbon dots (CDs)-based composite photocatalysts have been widely studied and utilized in catalytic fields. However, the preparation of the photocatalysts with high catalytic activity still faces a great challenge. Herein, white-light-driven CDs-based porous europium micro-networks (CDs@P-Eu-MNs) composite photocatalysts are prepared by a facile in-situ growth strategy. CDs can affect the morphology and produce a large number of porous structures of CDs@P-Eu-MNs. Importantly, the introduction of CDs not only increases the light absorption, but also promotes the separation of photogenerated charge carriers, and thus improve photocatalytic performance of CDs@P-Eu-MNs composites. CDs@P-Eu-MNs show the highest photocurrent density, which can be used for the highly-efficient photodegradation of rhodamine 6G dyes with almost 95% degradation rate under low power white light (20 W) without any radical generating agents such as H 2 O 2 . Therefore, this new and efficient CDs@P-Eu-MNs photocatalyst will have a great application prospect in water pollution treatment.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
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2021
·Vol. 56
·期 10
·5230-5241
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IF 3.713
Dai-Yu Zhang,Jun-Ru Qi,Wen-Xin Jiang,Jin-Song Liao,Xiao-Quan Yang
In this study, pectin polysaccharide (SDPP) was obtained from soybean dreg (26.2% yield), and characteristics of SDPP were compared with those of soybean soluble polysaccharides (SSPS) and citrus pectin (HMP). The galacturonic acid and molecular weight of SSPS, SDPP or HMP were 11.8%, 40.6% or 70.2% and 112, 446, or 440 kDa. SDPP had similar viscosity and protein content to SSPS, and functional groups and linear structure to HMP. SSPS, SDPP or HMP differed in particle size of 260, 467 or 1195 nm and ζ–potential of −5.8, −14.6 or −23.5 mV at pH 4.0. The precipitation of acidified milk drink (AMD) was 6.31% without stabiliser or below 1.75% with 0.4% SDPP at pH 3.6–4.6. These results suggested that SDPP combines the structure and characteristic of HMP and SSPS, and AMD with SDPP had great stabilising behaviour at wider pH range (pH 3.6–4.6).
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危险品化学品经营许可证（带存储）