JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Kun-Le Jia,Zhong-Shuai Zhu,Jin Qu,Ya-Qiong Jing,Xiao-Jie Yu,Yasmine Abdelkrim,Shu-Meng Hao,Zhong-Zhen Yu
Efficient separation of photogenerated electron-hole pairs is always one of the key factors boosting visible light photodegradation efficiency. Till now, there are few reports on the synergistic competitive consumption of photogenerated active species and the synergistic adsorption of organic contaminants to promote the performance of a designed heterojunction . Herein, we design and construct a novel BiOBr/Ag 6 Si 2 O 7 heterojunction with the dual synergistic effects towards methylene blue (MB) and methyl orange (MO). The dual synergistic effects could avoid the combination of photogenerated h + /e − pairs, improve the adsorption efficiency, and even regulate the photodegradation efficiency. Thus, for an aqueous mixture of MB and MO, the BiOBr/Ag 6 Si 2 O 7 photocatalyst exhibits largely improved adsorption capacities of the dyes by a multi-layer adsorption mode. Moreover, the photocatalyst could further promote the photodegradation rate of MO while slow that of MB due to the competitive consumption of photogenerated active species, showing a sequential selectivity phenomenon. Thanks to the dual synergistic effects, the adsorption capacity of MO increases 1379% higher than that of neat MO solution, and the photodegradation time decrease from 30 to 12 min with a rate constant of 0.22 min −1 , 38% higher than that of neat MO solution.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2018
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IF 3.046
Xiaoshan Yang,Xiufang Cui,Guo Jin,Jinna Liu,Yanbo Chen,Zhe Liu
Laser additive manufacturing (LAM) is a novel method for processing compositionally graded alloys and becomes increasingly important in the context of next-generation manufacturing technology. In this work, (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 soft magnetic alloys with different laser power were designed and processed by the LAM. The magnitudes of magnetic properties were analyzed, and the relationships among composition-microstructure-magnetic properties assessed. Results show that the (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 alloys by LAM exhibits relative uniform microstructure and comparable magnetic property compared with those conventional processed alloys. The bcc dominated microstructures exhibit a substantially higher saturation magnetization (Ms). With the increase in power, the average grain size of the alloy increased slightly and the increasing volume fraction of the Fe Si phase leaded to the enhancement of magnetization. The (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 alloys with laser power of 3000 W exhibits the highest Ms (199 emu/g). The appearance of Fe 3 B results in coarse dendrites and high coercivity (Hc) in the multiple re-heating cycles.
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Small
·
2018
·Vol. 14
·期 50
·1803387
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IF 9.598
Zhi-Chao Xiong,Ying-Jie Zhu,Dong-Dong Qin,Fei-Fei Chen,Ri-Long Yang
Efficient utilization of abundant solar energy for clean water generation is considered a sustainable and environment friendly approach to mitigate the global water crisis. For this purpose, this study reports a flexible fire-resistant photothermal paper by combining carbon nanotubes (CNTs) and fire-resistant inorganic paper based on ultralong hydroxyapatite nanowires (HNs) for efficient solar energy-driven water steam generation and water purification. Benefiting from the structural characteristics of the HN/CNT photothermal paper, the black CNT surface layer exhibits a high light absorbability and photothermal conversion capability, the HN-based inorganic paper acts as a thermal insulator with a high temperature stability, low thermal conductivity, and interconnected porous structure. By combining these advantages, high water evaporation efficiencies of 83.2% at 1 kW m −2 and 92.8% at 10 kW m −2 are achieved. In addition, the HN/CNT photothermal paper has a stable water evaporation capability during recycling and long-time usage. The promising potential of the HN/CNT photothermal paper for efficient production of drinkable water from both actual seawater and simulative wastewater samples containing heavy metal ions, dyes, and bacteria is also demonstrated. The highly flexible HN/CNT photothermal paper is promising for application in highly efficient solar energy-driven seawater desalination and wastewater purification.
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ACS Applied Materials & Interfaces
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2018
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IF 8.097
Duanchao Wang,Houyong Yu,Xuemeng Fan,Jiping Gu,Shounuan Ye,Juming Yao,Qingqing Ni
Charged nanocellulose (NC) with a high aspect ratio (larger than 100) extracted from animal or bacterial cellulose and chemical cross-linked NC aerogels have great promising applicability in material science, but facile fabrication of such NC aerogels from plant cellulose by physical cross-linking still remains a major challenge. In this work, carboxylated cellulose nanofiber (CNF) with the highest aspect ratio of 144 was extracted from wasted ginger fibers by a simple one-step acid hydrolysis. Our approach could easily make the carboxylated CNF assemble into robust bulk aerogels with tunable densities and desirable shapes on a large scale (3D macropores to mesopores) by hydrogen bonds. Excitingly, these CNF aerogels had better compression mechanical properties (99.5 kPa at 80% strain) and high shape recovery. Moreover, the CNF aerogels had strong coagulation–flocculation ability (87.1%), removal efficiency of MB dye uptake (127.73 mg/g), and moderate Cu2+ absorption capacity (45.053 mg/g), which were due to assistance mechanisms of charge neutralization, network capture effect, and chain bridging of high aspect ratio carboxylated CNF. This provided a novel physical cross-linking method to design robust aerogels with modulated networked structures to be a general substrate material for industrial applications such as superabsorbent, flocculation, oil–water separation, and potential electrical energy storage materials.
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Nanoscale
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2018
·Vol. 10
·期 37
·17647-17655
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IF 7.233
Ke Yang,Yu Yan,Haiyang Wang,Zhixuan Sun,Wen Chen,Hongtao Kang,Yi Han,Wenquan Zahng,Xiaohua Sun,Zhenxing Li
A novel copper/copper(I) oxide@carbon (Cu/Cu2O@C) core–shell nanocomposite monodispersed on the surface of reduced graphene oxide (defined as Cu/Cu2O@C-rGO) was synthesized using a one-step calcination of Cu-based metal organic frameworks (MOFs)/graphene oxide (GO) composite structure. The size of the resultant Cu/Cu2O@C core–shell nanoparticles (NPs) on the rGO layers were mainly distributed in range of about 90–100 nm with good dispersion, which was characterized using transmission electron microscopy. X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, nitrogen adsorption–desorption isotherms, X-ray photoelectron spectrometry and thermogravimetric analyses were also carried out to characterize the structure and composition of the Cu/Cu2O@C-rGO. The catalytic performance of the Cu/Cu2O@C-rGO composite was evaluated using a reduction reaction from 4-nitrophenol to 4-aminophenol. It was demonstrated that the Cu/Cu2O@C-rGO composite exhibited an excellent catalytic performance, which can reach a nearly 100% conversion rate in 90 s with 0.1 mg of catalyst. This catalyst also showed a good performance for the degradation of other organic dyes such as methylene blue, methyl orange and rhodamine B. Additionally, the core–shell structure exhibited good stability and reusability for the reduction reaction, which was because of its relatively better oxidation resistance than that of the bare Cu NPs. This research provided an efficient and stable non-noble metal-based catalyst derived from the MOF/GO structure.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
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IF 3.235
Ning Kang,Lifei Ji,Jun Zhao,Xian Zhou,Xianjun Weng,Hui Li,Xin Zhang,Fengchun Yang
The electrochemical methods with the advantages of sensitivity, accuracy, low-cost, simplicity and real-time online determination are expected to detect organic dyes, Methyl Orange (MO) and Rhodamine B (RhB), which are harmful to human beings extensively. In this work, Fe 3 O 4 and single-walled carbon nanotubes (SWNTs) hybrid, as a non-noble metal electrocatalyst , was synthesized by hydrothermal method and modified on the electrode to prepare an electro-sensor for monitoring MO and RhB. Due to the synergistic effects between Fe 3 O 4 and SWNTs, the magnified surface area and good dispersion of SWNTs, the Fe 3 O 4 /SWNTs hybrid, has the outstanding superiority of higher-conductivity and catalytical activity with a wide linear concentration range of 0.025–4000 μM, 0.1–250 μM and a calculated low detection limit (LOD) of 4 nM, 25 nM for MO and RhB respectively. Furthermore, it's the first time that the proposed electrode achieves the simultaneous determination of both dyes. Then, from the investigation of kinetics and pH value, it's found that both oxidation reactions involve two electrons and one proton participating. The modified electrode also exhibited good selectivity, high reproducibility and promising feasibility in practical sample analysis.
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JOURNAL OF POWER SOURCES
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2018
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IF 6.945
Guoping Chen,Xiong Song,Suqing Wang,Xinzhi Chen,Haihui Wang
Lithium-sulfur (Li S) batteries are attractive candidates for advanced energy storage devices. However, the low utilization of sulfur and the severe “shuttle effect” hinder the commercialization of Li S batteries. Herein, we design an ultra-thin and lightweight two-dimensional (2D) molybdenum nitride nanosheets layer to modify Celgard (denoted as MoN x /Celgard) separator to promote the electrochemical performance of Li S batteries. Benefiting from the 2D polar molybdenum nitride nanosheets, the obtained molybdenum nitride layer can effectively suppress the shuttle effect via the synergistic effect of structural confinement and chemical absorption . Meanwhile, molybdenum nitride nanosheets layer possesses metallic and catalytic characteristics, which are beneficial for high sulfur utilization. Therefore, the Li S batteries using MoN x /Celgard separator with multifunction exhibit high capacity and outstanding cycling performance. It delivers a high discharge capacity of 1298 mA h g −1 at 0.1C and sustain a capacity of 566 mA h g −1 after 500 cycles at 0.5C, corresponding with the capacity fading rate of only 0.063% per cycle.
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Environmental Progress & Sustainable Energy
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2018
·Vol. 38
·期 2
·336-344
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IF 1.326
Xueyan Li,Rong Yin,Yanyan Liu,Qingzhi Luo,Jing An,Desong Wang,Sijie Liu,Bo Dai
The ZnO/cyclized polyacrylonitrile (CPAN) composites were prepared by impregnation and heat treatment process. The morphology, crystal type, internal structure of ZnO/CPAN nanocomposites were characterized by UV-vis-diffuse reflectance spectroscope (DRS), X-ray diffraction, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The visible light photocatalytic activity of ZnO/CPAN was evaluated by degradation of methyl orange under xenon lamp irradiation. The DRS results indicate that the absorption of ZnO/CPAN nanocomposites in the visible region was significantly higher than that of pure ZnO nanoparticles. The TEM results show that the surface of ZnO nanoparticles is occupied by the CPAN in small amount. The results of photocatalytic experiment show that the photocatalytic activity of ZnO nanoparticles can be improved significantly by the modification of CPAN. The possible photocatalytic mechanism was also discussed. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 336–344, 2019
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
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IF 2.829
Fengping Wang,Wanming Zhang,Xiaohong Tan,Zhibao Wang,Yaxin Li,Wei Li
In the present study, catalytically active Ag nanoparticles were biosynthesized by the extract of Ginkgo biloba leaves through a facile and green manner. Well-dispersed Ag nanoparticles in spherical shape with size of 20–40 nm were obtained. Catalyzing the reduction of four typical pollutants, 4-nitrophenol, congo red, methyl orange, and rhodamine B , were achieved using the synthesized Ag nanoparticles, with the full conversion in 15–100 min. The pseudo-first order rate constant was calculated to be 0.0452 min −1 , 0.0568 min −1 , 0.0805 min −1 , and 0.285 min −1 for 4-nitrophenol, congo red, methyl orange, and rhodamine B, respectively. Furthermore, the catalytic activity can be preserved for 5 successive cycles. Wide applications in selective reduction reactions for pollutants treatment and fine chemical synthesis can be expected using the obtained catalytically active and recyclable Ag nanoparticles.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2013
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IF 2.672
Guangyu Zhao,Li Zhang,Kening Sun
Porous MoO 3 films are obtained by electrodepositing on Ni substrates. The galvanostatic charge/discharge tests show that, the film cathodes have a reversible capacity of 190 mA h g −1 at a current density of 30 mA g −1 between the voltage limits of 1.5–3.5 V vs. Li + /Li, a much better performance than the pristine MoO 3 powder. More than 75% capacitive contribution in the capacity of porous MoO 3 films is responsible for the high capacity, according to the cyclic voltammetry analysis. Another improved property of the porous MoO 3 films is the rate performance, which still retains 70 mA h g −1 at a current density of 1.25 A g −1 . The chronopotentiometry results reveal that, the prominent rate performances are owing to the high rate ability of the capacitive contribution.
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BIOSENSORS & BIOELECTRONICS
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2014
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IF 6.451
Hui Fang,Chang Xing Zhang,Luo Liu,Yong Mei Zhao,Hai Jun Xu
Multifunctional Ag nanoparticle-decorated TiO 2 nanorod arrays were prepared by two simple processes. TiO 2 nanorod arrays were first fabricated by the hydrothermal route and then Ag nanoparticles were decorated on the nanorods by the chemical reduction impregnation method. Three-dimensional Ag/TiO 2 arrays were used as an active substrate for surface-enhanced Raman scattering (SERS). The results show that the detection limit for rhodamine 6G (R6G) was as low as 10 −7 M and the Raman enhancement factor was as large as 10 5 . After calibrating the Raman peak intensities of R6G, it could be quantitatively detected. More importantly, the photocatalytic activity of TiO 2 provides a self-cleaning capability to the SERS substrate, which can be recycled and used to degrade many Ag surface adsorbates such as R6G, methyl orange, Congo red, and methylene blue after exposure to visible light. The absorbed small molecules can all be rapidly and completely removed from the SERS substrate, which has been successfully reused four times without a decrease in accuracy or sensitivity. Our results reveal that the unique recyclable property not only paves a new way to solve the single-use problem of traditional SERS substrates but also provides more SERS platforms for multiple detections of other organic molecular species.
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CRYSTENGCOMM
·
2014
·Vol. 16
·期 20
·4298-4305
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IF 3.858
Fan Tian,Jinyan Xiong,Huiping Zhao,Yunling Liu,Shengqiang Xiao,Rong Chen
Three-dimensional (3D) hierarchical BiOCl nanostructures constructed by interconnected two-dimensional (2D) nanoplates have been successfully synthesized via a facile solvothermal process with the assistance of mannitol. The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen adsorption. In the synthesis, mannitol acted both as a capping agent and a cohesive agent to mediate the formation of a hierarchical structure. A possible growth process involving crystal anisotropic growth habit and assembly process was proposed. The adsorption performance of BiOCl products for mixed organic dye removal was evaluated by using cationic rhodamine B (RhB) and anionic methyl orange (MO) as target substances. The as-prepared hierarchical BiOCl product exhibited excellent adsorption capacity and favorable recycling ability for mixed organic dye removal. This work demonstrated a novel strategy for the design and application of a well-defined complex hierarchical nanostructure.
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