JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Daowei Zhou,Yixing Zhong,Jie Yang,Jiangyu Qi,Yayun Zhuo,Yong Sha
By means of chemical combination between the Polydimethylsiloxane (PDMS) layer and Polyethersulfone (PES) layer, a kind of PDMS/PES composite membrane was prepared for separation of the light hydrocarbon components from the drilling mud. Meanwhile, its separation performance of the light-hydrocarbon components from the drilling mud was investigated and evaluated quantitatively. Results showed that the prepared PDMS/PES composite membrane had good mechanical performance, and it was resistant to corrosion of the water-based drilling mud. The PDMS/PES composite membrane can work stably at 5 MPa and 393 K. The responding time of the membrane to sudden change of the hydrocarbon gas content was less than one minute. For either single phase flow or gas-liquid two-phase flow, a high flow rate was recommended to avoid non-ideal flow patterns and to increase mass transfer in the feed channel of the membrane cell . Results in this work could be helpful for further application of the membrane technology in geological mud logging.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Xiangyu Zhang,Chao Zhang,Yongqiang Yang,Hongyu zhang,Xiaobo Huang,Ruiqiang Hang,Xiaohong Yao
Bacterial infection is one of the serious problems during wound healing. Antibiotics and traditional antibacterial treatment can produce side effects, such as bacterial resistance, cell toxicity, during the long-term interaction with bacteria. Therefore, developing new antibacterial materials and methods for rapid and safe disinfection in wound healing is important. This work fabricated a hybrid hydrogel incorporated with Ag 3 PO 4 /MoS 2 composites for rapid sterilization during wound healing. This hydrogel exhibited a superior antibacterial activity within 5 min by co-irradiation of 660 nm visible light (VL) and 808 nm near infrared (NIR) light due to the synergistic effects of both photodynamic antibacterial and photothermal antibacterial treatments. In addition, the antibacterial hydrogel could promote the wound healing compared with the pure hydrogel and medical gauze (MG) and cause no noticeable organ abnormalities in rats during the wound healing process.
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JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 5
·1-15
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IF 2.009
Wang Chao,Lv Bowen,Hou Jun,Wang Peifang,Miao Lingzhan,Ci Hanlin
The cerium dioxide nanoparticle (CeO 2 NP) (122 nm) aggregation process was investigated by nanoparticle tracking analysis (NTA), and the results were compared with those of dynamic light scattering (DLS). Unlike descriptions based on classical aggregation kinetics theory, the size distributions obtained by NTA and DLS show that aggregation of NPs in an aquatic environment is a complicated process and highly dependent on the particle number concentration, which is information that has been rarely presented in the literature. In particular, not all the particles were aggregated and there still remained some small CeO 2 NPs (< 400 nm), which has potential adverse environmental risks to the ecosystem and public health. Furthermore, the aggregate sizes are far smaller than previously shown in aggregation kinetics experiments. In addition, our findings also indicate that NTA can measure samples with mass concentrations ranging from 0.1 to 100 mg/L without dilution. In contrast, DLS cannot provide accurate information about aggregation kinetics when the mass concentration of CeO 2 NPs is lower than 1 mg/L (2.02 × 10 8 ± 1.66 × 10 7 by NTA data). Consequently, the classical aggregation kinetics experiment using DLS cannot accurately reflect the fate of NPs in aquatic environment, especially the heteroaggregation of NPs in complex water phase, and these results further demonstrate that the toxicity evaluation of NPs concerning different sizes measured by DLS need more rigorously experimental design. Therefore, our findings provide the first quantitative attempt to explore the experimental conditions and analytical methods for further study of aggregation kinetics.
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Frontiers in Chemistry
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2018
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IF 4.155
She Houde,Li Liangshan,Zhou Hua,Wang Lei,Huang Jingwei,Wang Qizhao
Selective activation of saturated C–H bond in hydrocarbons to produce high-value-added chemicals is of great significance for chemical synthesis and transformation. Herein, we present a facile procedure to achieve Ni-doped CdS nanoparticles with mixed (cubic and hexagonal) phases, as well as its application to the photocatalytic activation of saturated primary C–H bond of toluene and its derivatives. The photocatalytic oxidation rate of toluene into benzaldehyde of formation reached up to 216.7 μmolh−1g−1 under visible light irradiation. The excellent photocatalytic performance of Ni(II)-doped CdS [Ni(II)/CdS] can be attributed to its unique structural assembly with cubic and hexagonal phases and also the addition of Ni ions, together taking effect in promoting the separation of photogenerated charge carriers. The possible reaction mechanism for the photocatalytic selective oxidation is illustrated in this work. The band width of the as-prepared mixed phase CdS is reduced, which can effectively expand the response range and improve photocatalytic performance.
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PubMed
高影响因子
DYES AND PIGMENTS
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2018
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IF 3.767
Lei Zhang,Cunyu Li,Jingfa Li,Fan Jiang
Photo-responsive molecules have been widely investigated since they exhibit potential applications in optoelectronics and molecular devices. Although the photocurrents in some photo-responsive systems can be successfully turned ‘on’ and ‘off’ via light irradiation, the modulation of the vastly different directions of electron flow have seldom been realized by light (i.e., induce electron flow in opposite directions simply by light). In this manuscript, we provide evidence that the electron flow directions could be successfully controlled by light, using a molecule/TiO 2 hybrid system based on azo dyes (methyl red and ethyl red) as an example. In particular, a light-induced current exists when a UV light is employed, while the photocurrent direction isreversed when a visible light is employed. Possible origins of such peculiar photoelectrochemical behaviors are suggested, based on the optimized structures and electronic/optical properties determined from the first principles calculations. We expect that with further molecular engineering and structure optimization, the electron flow directions as well as the photocurrent intensities in functional materials could be better controlled by light, which provide a foundation for the fundamental understanding of the photo-responsive behaviors in advanced functional materials, and may pave the way for the design of novel optoelectronic devices and solar fuel systems in which the opposite electron transfer directions could be manipulated remotely by light sources.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 18
·15859-15868
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IF 2.324
Liu Chao,Xu Guilong,Zhu Yisong,Xu Qixiang,Yu Guiyun,Hou Haijun,Xu Qi,Xi Xinguo,Hou Wenhua
A simple calcination approach was performed to synthesize layered K 3 Ti 5 NbO 14 /g-C 3 N 4 (TNCN) composites, in which g-C 3 N 4 was formed both within the interlayers and on the surface of N-K 3 Ti 5 NbO 14 . The photocatalytic activity of samples was evaluated by the visible-light photocatalytic degradation of rhodamine B (RhB). It was found that TNCN composite with a proper mass ratio of N-K 3 Ti 5 NbO 14 to g-C 3 N 4 exhibited the rapid rate of charge separation and high efficiency of light harvesting due to the synergetic effects of layered heterojunction and N doping, leading to an excellent photocatalytic activity. Especially, the in situ intercalated mono-layered g-C 3 N 4 nanosheets can significantly increase the contact area between K 3 Ti 5 NbO 14 layers and g-C 3 N 4 nanosheets for efficient charge transfer across the interface, showing the greater effect on the enhanced photocatalytic activity. The active species trapping experiments and ESR measurements were carried out to evaluate the contribution of the active species in this photocatalytic degradation process. It was revealed that both superoxide radicals ( · O 2 − ) and holes (h + ) are the main active species, while hydroxyl radicals ( · OH) made a minor contribution to the photocatalytic degradation of RhB.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Yating Wang,Jinmeng Cai,Moqing Wu,Jiahuan Chen,Wanyue Zhao,Ye Tian,Tong Ding,Jing Zhang,Zheng Jiang,Xingang Li
Defect engineering is a promising strategy to enhance light absorption and charge separation of photocatalysts. Herein, we simply tailor the quantity and distribution of oxygen vacancies, as one of typical defects, on surface or bulk of thermal-treated WO 3 in the different H 2 concentration. The quantity of bulk oxygen vacancies on WO 3 consistently rises with the increased H 2 concentration, while that of surface oxygen vacancies presents a volcano-type variation. The sample of WO 3 -H20, thermal-pretreated in 20% H 2 , contains the largest amount of surface oxygen vacancies. Our results show that both surface and bulk oxygen vacancies on WO 3 can promote the visible light photocatalytic activity in water splitting, however, in different ways. Bulk oxygen vacancies mainly promote the visible light harvesting and slightly restrain the electrons and holes recombination by narrowing band gap energy ( E g ), while surface oxygen vacancies significantly increase the charge-carriers separation efficiency by lowering valence band edge (VBE). Compared with the light absorption, the separation of electrons and holes is more critical in photocatalytic oxygen evolution over WO 3 , revealing the more decisive role of surface oxygen vacancies than bulk oxygen vacancies. Expectedly, WO 3 -H20 shows the highest charge-carriers separation efficiency and visible light photocatalytic performance. Our work provides a new insight into designing of efficient defect-engineered semiconductors for the related solar light utilization processes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Jirong Bai,Wenhua Lv,Zhijiang Ni,Zhilei Wang,Gang Chen,Haiyang Xu,Hengfei Qin,Zheng Zheng,Xi Li
MoS 2 /S-doped porous g-C 3 N 4 (MoS 2 /SPGCN) hybrids were fabricated via a facile calcination and ultrasound assembly method. Structural characterization indicated MoS 2 nanosheets were successfully loaded on SPGCN isotype heterojunction hybrids. The MoS 2 /SPGCN photocatalysts showed more visible light absorption, larger specific surface area, and faster electron-hole separation. MoS 2 /SPGCN significantly accelerated Rhodamine B photodegradation under visible light irradiation, which was mainly because the enriched active sites, broadened visible light absorption, and newly-formed heterojunction between MoS 2 nanosheets and SPGCN together suppressed the recombination of photoinduced electron-hole pairs. MoS 2 /SPGCN also showed excellent recyclability and chemical stability. Thus, this work presents a good strategy of designing efficient photocatalysts by substituting the single catalyst base with metal-free isotype heterojunction hybrids.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Qun-Zeng Huang,Ze-Juan Tao,Li-Qun Ye,Hong-Chang Yao,Zhong-Jun Li
Development of highly efficient and low-cost noble metal-free co-catalysts for photocatalytic H 2 evolution from water splitting has been aiming at a long-term goal of a renewable hydrogen economy. Herein, a series of novel Mn 0.2 Cd 0.8 S/CoP 3 composites have been successfully prepared through loading CoP 3 nanoparticles on the surface of one dimensional (1D) Mn 0.2 Cd 0.8 S nanowires (NWs) by a facile solvothermal method. Under visible light (λ ≥ 420 nm) irradiation, the as-prepared Mn 0.2 Cd 0.8 S/CoP 3 composite with 2.87 wt% of CoP 3 displayed the highest photocatalytic H 2 evolution activity with a corresponding H 2 evolution rate of 29.53 mmol g −1 h −1 and an apparent quantum yield of 29.2% at 420 nm, which was about 5.02 times higher than that of pure Mn 0.2 Cd 0.8 S and 1.79 times than that of Mn 0.2 Cd 0.8 S/Pt-1.5 wt%. Moreover, the Mn 0.2 Cd 0.8 S/CoP 3 composite exhibited excellent photostability. The superior photocatalytic activity of Mn 0.2 Cd 0.8 S/CoP 3 composite was predominantly attributed to the synergistic effects of highly efficient charge separation efficiency and sufficient active sites for H 2 evolution reaction. This work revealed that low-cost CoP 3 can replace noble metal Pt as a highly efficient co-catalyst for enhancing the photocatalytic activity of semiconductor materials.
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Materials Research Express
·
2018
·Vol. 5
·期 6
·065906
·
IF 1.151
Dong Mao,Lishan Zhu,Xiaofeng Fei,Xinyu Zheng,Dong Fang
The fabrication of indium sulfide/graphene oxide composites (In2S3@GO) via a novel hydrothermal method was reported. The morphology of the composites showed that the daisy-like In2S3 structures were dispersed evenly on GO with large specific surface area. The photocatalytic performance of In2S3@GO was evaluated through photodegradation Rhodamine B. In2S3@GO exhibits higher photodegradation performance than that of pure In2S3. In addition, the composites showed great adsorption-desorption ability and stability. The solution pH value also has a significant influence on photocatalytic activity of In2S3@GO. This work may provide new insights to construct carbon-based semiconductor photocatalyst for organic dye pollution degradation.
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Catalysts
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2019
·Vol. 9
·期 7
·616
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IF 3.444
Ruizhou Gan,Xiaohua Ma,Guorong Wang,Zhiliang Jin
CoSe2,as a kind of co-catalyst, would replace noble metals element to dope pure CdS. The CoSe2/CdS photocatalyst could be synthesized by simple physical mixing. With the introduction of CoSe2, especially 30% CoSe2/CdS, hydrogen production would be about 500 μmol within 5 h, five times that of pure CdS under the same conditions. The CoSe2/CdS photocatalyst could bear four cycles of hydrogen evolution and sustain the hydrogen production, with a minor decrease. In other words, the electron transition velocity would surge along with the introduction of CoSe2particles. The CoSe2could be deemed as the predator and exit of electrons to inspire the detachment of the hole-electron pairs and relieve the recombination of the hole-electron pairs.Keywords:CoSe2clusters;CdS nanorod;hydrogen evolution;photocatalysis
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JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 20
·13118-13134
·
IF 3.442
Zhang Xiaorong,Shakeel Muhammad,Li Baoshan,Zhang Jinxi,Wang Lei
Proficient visible light-driven photocatalyst for waste water remediation has gained immense attention in decades. Herein, novel foamed zinc oxide–silica spheres and carbon nitride nanocomposite (FZSS@CN) were fabricated by hydrothermal and calcination treatments. The resulting nanocomposite was passed through complete characterization profiling for structural, optical and kinetics properties. The photocatalytic performance was investigated by the degradation of textile dyes such as methylene blue (MB) and Rhodamine B (RhB) under visible light. The optimized nanocomposite (FZSS@CN-10) exhibited the superior photocatalytic degradation performance up to 95% for MB and 90% for RhB with rate constant ( k ) = 0.0516 min −1 and 0.0464 min −1 , respectively. This excellent performance was attributed to the hierarchical morphology, high surface area and mesoporous channels with open cavities. This uniqueness is responsible to enhance the optical and kinetic capabilities of the material for effective photocatalysis. More interestingly, the crystalline structure of the recycled sample has more sharp peaks than fresh sample. This phenomenal behavior leads to a new method for the fabrication of effective materials in this field.
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