Solar RRL
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2021
·Vol. 5
·期 12
·2100559
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IF 8.582
Hong-Hong Zhang,Zi-Chun Zhou,Yu-Jie Dong,Li Zhang,Hong-Yan Chen,Dai-Bin Kuang
Utilizing halide perovskites for photocatalytic aromatic C( sp 3 ) H bond activation remains a great challenge due to the serious recombination of photogenerated charge carriers and slow reaction dynamics of the materials themselves. Herein, a lead-free perovskite-based hybrid of Cs 3 Sb 2 Br 9 /g-C 3 N 4 nanosheet is constructed and applied for photocatalytic aromatic C( sp 3 ) H bond activation, which shows enhanced photocatalytic performance. By introducing ultrathin g-C 3 N 4 nanosheets as the heterogeneous nucleation sites, size-reduced and well-dispersed Cs 3 Sb 2 Br 9 nanocrystals can be obtained. The as-formed close contact and high-quality heterointerface between Cs 3 Sb 2 Br 9 and g-C 3 N 4 provides pathways for fast charge transfer which is beneficial to improve the separation efficiency of photogenerated electron−hole pairs. Under visible light irradiation, the Cs 3 Sb 2 Br 9 /g-C 3 N 4 hybrid photocatalyst can effectively oxidize toluene toward benzaldehyde and benzyl alcohol with a total conversion rate of 8346.8 μmol g −1 h −1 , which is 26.6- and 6.0-fold that of pure g-C 3 N 4 and Cs 3 Sb 2 Br 9 , respectively. This work demonstrates the potential of all-inorganic lead-free halide perovskite-based heterostructures for photocatalytic organic reactions.
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CHEMOSPHERE
·
2021
·
IF 7.086
Huanzhao Liu,Pengxin Li,Yifan Wang,Huijie Wang,Yi Fang,Zhonglu Guo,Yang Huang,Jing Lin,Long Hu,Chengchun Tang,Zhenya Liu
Toxic dyes in wastewater will become a significant hazard to human health if they are not treated effectively. Therefore, it is significant to separate and remove dyes from the aqueous solution. C and O co-doped BN (BCNO) with high adsorption capacity and outstanding cycle efficiency is a simple and efficient adsorbent for the cationic dye malachite green (MG). Glucose is characterized as an eco-friendly and cheap source of C and O. Benefited by the high specific surface area (1515.6 m 2 /g), the maximum adsorption capacity of MG is 1511.1 mg/g. Besides, the curves of adsorption fitting correspond to the Langmuir model and the pseudo-second-order model, respectively. Moreover, after 5 cycles, the adsorption efficiency reached 78% of the first time and the adsorption capacity remained above 780 mg/g. Furthermore, in the selectivity adsorption study, the cationic dyes (MG, neutral red (NR), methylene blue (MB)) can be removed more effectively in the binary dye system of MG-methyl orange (MO), NR-MO, MB-MO, MG-Orange II (OR), MB-OR, or NR-OR. BCNO-2 has a promising application in the removal of cationic dyes from complex dye wastewaters.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Xin Zhang,Wenxuan Zhang,Lingchao Zhang,Zhenguo Huang,Jianjiang Hu,Mingxia Gao,Hongge Pan,Yongfeng Liu
Lithium borohydride (LiBH 4 ) exhibits poor hydrogen storage reversibility because of phase separation between LiH and B due to foaming during thermal dehydrogenation. Herein, we report that by synthesizing nanostructured LiBH 4 without any supports, the foaming and phase separation can be effectively suppressed, and consequently, the hydrogen storage reversibility of LiBH 4 can be considerably improved. Using a facile single-pot solvothermal approach, a hierarchical porous nanostructured LiBH 4 composed of 50–60 nm-sized primary nanoparticles is synthesized. The resulting neat nano-LiBH 4 reversibly desorbs and absorbs approximately 12 wt% of H at 400 °C and under 100 bar H 2 . The superior hydrogen storage performance is attributed to the effective inhibition of foaming upon heating. The formation of LiH and B prior to melting, which can be associated with the largely reduced particle sizes and porous agglomeration structure, plays a crucial role in suppressing foaming. Our findings offer a new strategy for the preparation of nanoscaled freestanding borohydrides, and also important insights into the development of highly reversible metal borohydrides for hydrogen storage applications.
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OncoTargets and Therapy
·
2019
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IF 3.046
Ling-Hui Zeng,Qing-Mei Wang,Lin-Yi Feng,Yu-Dun Ke,Qian-Zi Xu,An-Yi Wei,Chong Zhang,Rong-Biao Ying
Purpose Vitamin C (VC) is a kind of essential nutrient in the body regarded as a canonical antioxidant during the past hundred years. However, the anti-cancer effect of VC is controversial. Our study is trying to clarify the relationship between VC dosage and breast cancer metastasis. Methods Human breast cancer cell lines Bcap37 and MDA-MB-453 were treated with VC at three different concentrations (low-dose, 0.01 mM; medium-dose, 0.1 mM; high-dose, 2 mM). Wound healing assays were conducted for migration assay; transwell tests were performed to detect the ability of cell invasion. The protein levels were evaluated by Western blot analysis or immunohistochemistry. Tumor xenografts in nude mice were built to test the effects of VC on breast cancer cell proliferation and metastasis. Results 0.01 and 0.1 mM VC promoted cell migration and invasion when compared with the control group, but 2 mM VC significantly suppressed cell migration and invasion of breast cancer cell lines. High-dose VC increased E-cadherin and reduced Vimentin, indicating that high-dose VC suppressed epithelial-mesenchymal transition (EMT) in breast cancer cells. Besides, high-dose VC inhibited cell invasion promoted by TGF-β1 in breast cancer cells. Meanwhile, high-dose VC reversed the suppression of E-cadherin and enhancement of Vimentin induced by TGF-β1 in breast cancer cells. Furthermore, high-dose VC significantly inhibited breast cancer metastasis in vivo. Conclusion High-dose VC inhibits cell migration and invasion of breast cancer cell lines through suppressing EMT. Thus, it may be considered as an anticancer drug candidate for breast cancer patients.
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CARBON
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2019
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IF 7.466
Jinzhu Tang,Shuqing Chen,Yulong Jia,Ying Ma,Hongmei Xie,Xin Quan,Qi Ding
As a new type of carbon material, carbon dots (CDs) with exceptional properties are regarded as a type of potential water-based lubricant additive . In this study, it is first demonstrated that CDs perform excellently when used as lubricant additives for water-lubricated amorphous carbon (a-C) contacts. The results show that the introduction of CDs into water at a concentration of 0.1 wt% could reduce friction and wear in a-C contacts by 33% and 80%, respectively. Additionally, the lubricating performance of CDs is highly sensitive to its adding concentration. The excellent tribological performance of CDs results from the minimized CDs sediment particles (deposited in situ on worn a-C surfaces) and the reduced friction and wear via nano-bearing and nano-filling mechanisms. With high CDs concentrations, however, micron and submicron-sized sediment particles form when friction occurs and cause undesirable abrasive wear . For water-lubricated a-C contacts, therefore, the CDs concentration is the crucial determinant of lubrication performance that has to be appropriately controlled.
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COMPOSITES PART B-ENGINEERING
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2019
·
IF 6.864
Shanshan Xiao,Hui Mei,Daoyang Han,Laifei Cheng
SiC nw /C/Si 3 N 4 porous ceramic composites with layer-by-layer structure were successfully fabricated by freeze drying, carbonization and chemical vapor infiltration processes for excellent room and high temperature electromagnetic (EM) wave absorption properties . The sandwich-like structure within the layer and the capacitor model structure between the layers are formed inside of the composite, and these structures are beneficial to the EM wave consumption. The EM absorption properties are optimized by regulating the relative contribution of the polarization loss (primarily provide by SiC nw and defects in carbon phase) and the conductance loss (primarily offered by the conductive network formed by the carbon thin film). As an antioxidant protective layer, Si 3 N 4 ceramic coating is prepared on the outside of the carbon film . The prepared SiC nw /C/Si 3 N 4 porous composites show high absorption efficiency (exceed −39.7 dB), wide absorption band (cover the whole X band), small density (0.92 g/cm 3 ), thin thickness (2.9 mm), and excellent high-temperature stability (stable up to 873 K). The unique structures not only facilitate EM wave absorption, but also enable the composite a compressive strength of 168 MPa.
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ACS Omega
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2019
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IF 2.584
Chunxia Wang,Huangliang Zhong,Wenjie Wu,Caiwen Pan,Xiaoran Wei,Guanglin Zhou,Fan Yang
Herein, we demonstrate a new class of core–shell magnetic carbon hybrid materials (Fe3O4@C) for remarkable adsorptive desulfurization of dibenzothiophene (DBT), which have been successfully prepared through hydrocarbonization of glucose on the surface of Fe3O4 and the subsequent pyrolyzation process. The as-obtained Fe3O4@C retains amorphous nature of carbon shells with a large surface area and displays an increase of iron atoms as active sites under elevated pyrolyzation temperature which is favorable in the adsorption of sulfur-containing species through physical and chemical adsorption, respectively. We investigate the adsorption capacity and efficiency of Fe3O4@C as a magnetically adsorbent for the removal of DBT in model oils under various experimental conditions including the adsorbent obtained at different temperatures, the amount of adsorbents, the DBT initial concentration, the regeneration approach, as well as the interference species. Our results demonstrated that the as-obtained Fe3O4@C at 650 °C (Fe3O4@C-650) displays a remarkable estimated adsorption performance (57.5 mg DBT/g for 200 ppmw), extraordinary high desulfurization efficiency (99% for 200 ppmw), and a high selectivity for DBT compared with its derivatives. Moreover, Fe3O4@C can be recovered in a quite easy, economical, and eco-friendly manner by an external magnet after five cycles without significant weight loss, which significantly simplifies the operation procedure and favors the recycle of Fe3O4@C. Combined with the economic and eco-friendly merits, Fe3O4@C offers a new avenue to employ the magnetic carbon materials for industrial applications and provides a promising substitute for adsorptive desulfurization in view of academic, industrial, and environmental aspects.
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BIOSENSORS & BIOELECTRONICS
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2019
·
IF 9.518
Xi Zhang,Kuan-Neng Chi,De-Lei Li,Yan Deng,Yu-Chan Ma,Quan-Qing Xu,Rong Hu,Yun-Hui Yang
In this study, a novel photoelectrochemical (PEC) aptasensor based on two-dimensional (2D) porphyrinic covalent organic frameworks (p-COFs) for the label-free detection of C-reactive protein (CRP) is presented. The obtained p-COFs possess high conductivity and an improved stability due to strong and rigid covalent linkages. The introduction of p-COFs hinder the recombination of electrons and holes, decreasing their band gap (E g ), thereby which improved the photocurrent conversion efficiency. Compared with pure porphyrin , p-COFs exhibited enhanced photocurrent intensity. An amplified photocurrent conversion efficiency and enhanced photocurrent results from H 2 O 2 , which act as active molecules and electron donors . As an unprecedented application of COFs in PEC bioanalysis , the detection of CRP with a PEC aptasensor is presented. The assembly of a CRP aptamer on the surface of Ag nanoparticles hinders the electron transfer , resulting in the decrease of the photocurrent response. This PEC aptasensor exhibits good analytical performances such as a rapid response, high stability, wide linear range and excellent selectivity , making COFs promising candidates for PEC bioanalysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Lin He,Yimin Gao,Yefei Li,Zhiwei Liu,Weiyao Zhang,Guangcan Zhou,Hongying He,Siyong Zhao,Honggang Liu,Wentao Yan
Ti(C,N)-304ss cermets with various rare earth yttrium addition were fabricated via powder metallurgy . Fe and Cr atoms dissolved into Ti(C,N) grains and formed a core-rim structure. The first-principle method was employed to calculate the lattice parameters and elastic modulus of the solid solution. The formation of solid solution not only reduced the lattice misfit between the binder phase and hard phase but also improved the hardness of hard phase. The in-situ formed nano-Y 2 O 3 particles existed at the center of Ti(C,N) grains acting as ‘mid effect’ heteromorphic nuclei. The microstructure of cermets was refined with Y addition and the abnormal growth of hard phase was suppressed. The mechanical properties were also improved with Y addition. When the Y content reached 0.3 wt%, the optimal mechanical properties were obtained with a TRS value of 1527 MPa and a hardness value of 91.7 HRA.
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FOOD RESEARCH INTERNATIONAL
·
2019
·
IF 3.579
Mohan Zhang,Xin Yang,Wan Xu,Xiaobo Cai,Mingxiang Wang,Yuying Xu,Peilin Yu,Jun Zhang,Yifan Zheng,Jiang Chen,Jun Yang,Xinqiang Zhu
High sugar content in beverage or food can affect the aging process, and thus natural/artificial sweeteners are widely used as substitutes. However, whether sweeteners have such adverse effects as sugar remains to be clarified. Therefore, in the current study, three sulfa sweeteners, namely, saccharin sodium salt hydrate (SAC 2 ), sodium cyclamate (CYC 3 ) and acesulfame potassium (AceK 4 ) were evaluated for their effects on the lifespan, deposition of lipofuscin, exercise activity, food intake, and intestinal fat deposition (IFD 5 ) of Caenorhabditis elegans ( C. elegans 6 ). It was shown that SAC at 0.3 and 10 mg/mL shortened the lifespan of C. elegans and impaired the exercise capacity, while at other concentrations no significant effects were observed. In contrast, CYC at 0.1, 1 and 10 mg/mL prolonged the lifespan of C. elegans. On the other hand, AceK at 1 mg/mL increased the lifespan of C. elegans , and could decrease both lipofuscin deposition and IFD in a dose-dependent manner. Taken together, these results indicated that although SAC, CYC, and AceK all belong to the sulfa sweeteners, each has distinct effects on different physiological activities associated with aging, at least in C. elegans .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Zhiguo Zhang,Hua Huo,Jinlong Gao,Zhenjiang Yu,Feitian Ran,Lei Guo,Shuaifeng Lou,Tiansheng Mu,Xucai Yin,Qun Wang,Geping Yin
In this paper, NiO nanoparticles uniformly embedded in spherical carbon matix in situ grown on reduced graphene oxide (rGO) has been successfully fabricated via a simple pyrolysis of nickel metal organic framework (MOF) precursor self-assembled on graphene oxide. This interaction between the carbon and the NiO can significantly maximize the surface of NiO for pseudocapacitance, provide effective electronical transmission path and improve the ionic absorbability and conductivity. As a result, the NiO/C/rGO hybrid electrode demonstrates high specific capacity (496 C g −1 at current density of 1 A g −1 ) and good cycling stability. Moreover, a hybrid supercapacitor assembled by NiO/C/rGO and a hierarchical porous carbon derived from sodium citrate can deliver a high energy density of 35.9 Wh kg −1 at a power density of 749.1 W kg −1 , and extraordinary cycling stability (120% retention after 3000 cycles). It has been demonstrated that the carbon matrix derived from the linker molecules in Ni-MOF, which maintains close contact with both the size-controlled NiO nanocrystals and the electronic conductive rGO, is vital to synergize the electric double layer capacitance from the carbon materials and the battety-type behavior from NiO for high-performance energy storage.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Kun Wang,Dongying Ju,Guiying Xu,Yongfei Wang,Shaobei Chen,Jian Zhang,Yuyuan Wu,Weimin Zhou
The new functional FeO/C composite carbon materials are successfully fabricated by controlling the adding amounts of Fe 3 O 4 particles in mixtures of coal tar pitch and Fe 3 O 4 particles. The structures of prepared FeO/C composite carbon materials were verified by XRD measurements. The excellent electrochemical performances of FeO/C composite carbon materials were evaluated in detail. For instance, the prepared materials show the high cycling performances at 679 mAh/g after carrying out charge-discharge 100 cycles. Meanwhile, the high rate performances and long cycle life characteristics of FeO/C composite materials were also observed. As a result, it is palpable that the carbon contents and specific area are the vital factors to improve the electrochemical performances of FeO/C composite materials, which effectively provides the reference to design the transition metal oxide/carbon composite materials as Li + ion storage materials.
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