INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·Vol. 48
·期 83
·32459-32468
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IF 7.2
Chengguo Yan,Qinan Wu,Jiaguang Zheng,Dan Li,Jiahuan He,Yugang Shu,Meijia Liu,Liuting Zhang
NaBH 4 has been considered as one of the ideal hydrogen carriers with comparatively high hydrogen capacities towards traditional hydrogen storage materials . However, the hydrogen generation from NaBH 4 needs excess water and costly catalysts to achieve a complete and fast hydrogen release. Herein, we report an innovative strategy to use solid-state multi-hydroxyl mannitol as a reactant towards NaBH 4 , which brings fast and controllable hydrogen release below 80 °C. More than 4.1 wt% H 2 (83% of the theoretical capacity) could be released totally from the NaBH 4 -mannitol composite with high purity. Structural and morphological studies further reveal that mannitol acts as a bi-functional additive to react with NaBH 4 during hydrogen release and protect NaBH 4 from moisture during storage. This work shows potential in developing all-solid-state hydrogen production systems with high-capacity borohydrides .
研究领域:
材料科学
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氢能
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化学工程
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2023
·
IF 2.7
Xuening Han,Jie Li,Hao Wu,Kai Sun,Yixin Chen,Lijun Jia,Huaiwu Zhang,Pengjie Zhang,Chunyang Wu
In this paper, the Bi-In co-substituted YIG ferrite materials composed of Y 3− x Bi x Fe 4.55 In 0.45 O 12 ( x = 0.0–1.0 with a step of 0.2) were synthesized by a conventional solid-state route. Samples with different Bi 3+ ion contents were sintered at different temperatures. The phase formation, microstructure, dielectric and magnetic properties of samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), impedance analyzer, vibrating sample magnetometer (VSM), and ferromagnetic resonance (FMR). The results showed that Bi 3+ ion substitution could reduce the sintering temperature, increase the bulk density ( d b ), improve the dielectric constant ( ε' = 22.26@100 MHz at × = 1.0) and keep a high saturation magnetization ( 4πM S = 1700–1850 Gs), but led to the increase of the FMR linewidth ( ΔH = 316.21 Oe at × = 1.0).
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JOURNAL OF BIOMATERIALS APPLICATIONS
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2022
·
IF 2.712
Meiling Zhong,Jixia Lin,Yudie Yang,Mingzhuo Liu,Guanghua Guo,Dehui Ji,Richao Zhang,Jiali Zhang
Guided tissue regeneration (GTR) membranes have great potential to promote periodontal tissue regeneration and reestablishment. However, the regeneration potential and microbial infection resistance of current GTR membranes still need to be improved. Here, a bi-layered nanofibrous membrane on the basis of poly (lactic-co-glycolic acid) (PLGA)/gelatin with osteogenic and antibacterial functions was fabricated for periodontal tissue regeneration. The antimicrobial layer (AL) of the bi-layered nanofibrous membrane was composed of nanofibrous PLGA/gelatin nanofibers loaded with nano-silver (nAg), while the osteoconductive layer (OL) of the nanofibrous membrane consisted of PLGA/gelatin nanofibers loaded with nano-hydroxyapatite (nHA). The bi-layered nanofibrous membrane was examined by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectrometry (XPS) and X-ray diffractometry (XRD). The results showed that nHA and nAg particles were well evenly loaded or embedded in PLGA/gelatin nanofibers. The cell culture experiments suggested that the bi-layered nanofibrous membrane possessed good cytocompatibility and the OL of the bi-layered nanofibrous membrane possessed an enhanced osteogenic capacity for human osteoblast-like cells (MG63), which was verified by the good cell viability and the increased alkaline phosphatase (ALP) activity, respectively. The results of in vitro antimicrobial study displayed that the AL of the bi-layered nanofibrous membrane possessed an effective antibacterial capability. In conclusion, the prepared bi-layered nanofibrous membrane with osteogenic and antibacterial functions may have great potential for periodontal tissue regeneration and reestablishment.
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MATERIALS CHEMISTRY AND PHYSICS
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2022
·
IF 4.778
N.R. Khalid,Hamid Ishtiaq,Faisal Ali,M.B. Tahir,Sumaira Naeem,A. Ul-Hamid,M. Ikram,T. Iqbal,M. Rizwan Kamal,Hussein Alrobei,Meshal Alzaid,A. Dahshan
The fast pace of industrial growth during the current decade has seen a large family of dyes employed copiously in the production of various products such as paper and ink. These dyes pollute earth's ecosystems. Researchers look at various ways to degrade these dyes including the use of suitable nanomaterials . ZnO is an important semiconductor material that can be employed for this purpose. In this research work, we optimized the photocatalytic capability of ZnO by co-doping it with 1–7 wt% of Bi and N. The synthesized Bi and N co-doped ZnO nanorod samples showed excellent photocatalytic behavior towards Rhodamine-B (RhB). It was confirmed using XRD and SEM that (5, 2.5) wt.% Bi/N co-doped ZnO nanorods exhibited unique morphology and structure. EDX successfully assessed the elemental composition of the synthesized samples. To provide further insight into its microstructure, the HRTEM and SAED analysis were performed. Optical properties were determined using PL and UV–Visible spectroscopy. The prepared nanorod material degraded almost 89% of RhB in 180 min. The superior degradation ability of co-doped ZnO material when exposed to visible portion of sunlight spectrum is credited to the decrease in the recombination rate of charges and an increase in the depth penetration of photons. The degradation efficiency of Bi/N co-doped ZnO material is enhanced due to reduced recombination rate and increased production of number of defects and oxygen vacancies .
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Environmental Science-Nano
·
2021
·Vol. 9
·期 1
·349-360
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IF 8.131
Cailiang Yue,Changqing Zhu,Wenting Zheng,Jinli Qiu,Zhiling Du,Chen Ling,Fu-Qiang Liu
Highly efficient mineralization of refractory organic pollutants is an admittedly difficult problem for most photocatalytic processes. Herein, a hierarchical type-II heterojunction Bi2MoO6/Bi/BiOBr-x (BMO/Bi/BOB-x) was successfully fabricated via a one-pot solvothermal method. The optimal BMO/Bi/BOB-2 exhibited an ∼80% mineralization ratio of ciprofloxacin under simulated solar irradiation, outperforming most reported photocatalysts. ˙OH was demonstrated to be the dominant reactive species. The ˙OH production capacity of BMO/Bi/BOB-2 increased by 76.2% compared with that of BMO/BOB, highlighting the key role of Bi nanoparticles (Bi NPs). Bi NPs not only induced a strong localized surface plasmon resonance effect to enhance the utilization of visible light, but also acted as an electron mediator to accelerate the separation of e−/h+ pairs. Due to the specific redox potential, the separated h+ and e− could activate H2O and O2 to produce ˙OH synchronously. Overall, this work provided a valuable strategy to design a plasmonic Bi NP-enhanced type-II heterojunction for the efficient treatment of refractory organic wastewater.
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MICROCHIMICA ACTA
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2021
·Vol. 189
·期 1
·1-11
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IF 5.833
Ma Junping,Bai Wushuang,Liu Xiaoli,Zheng Jianbin
Integrating other metal ions into mono-metallic metal–organic framework (MOF) to form bi-metallic MOF is an effective strategy to enhance the performance of MOFs from the internal structure. In this study, two-dimensional (2D) cobalt/zinc-porphyrin (Co/Zn-TCPP) MOF nanomaterials with different Co/Zn molar ratios were synthesised using a simple surfactant-assisted method, and novel dopamine (DA) sensing methods were constructed based on these materials. The characterisation results showed that all MOF with different Co/Zn molar ratios presented a nanofilm, and the Co and Zn elements were uniformly distributed. All sensors based on Co x Zn 100− x -TCPP had a certain catalytic performance to DA. Among them, the sensor based on CO 25 Zn 75 -TCPP showed the strongest signal response, indicating that the catalytic performance of MOF on DA can be adjusted by changing the Co/Zn molar ratio. The doping of metal ions improves the chemical environment of the pores, and increases the types and spatial arrangement of the active sites of the MOF, which is beneficial to the electron transfer and exchange with DA; Co 2+ and Zn 2+ active centres have a synergistic promotion effect, so the catalytic activity of MOF is significantly improved. The linear range at the potential of 0.1 V based on Co 25 Zn 75 -TCPP for DA was 5 nM–177.8 μM, with a detection limit of 1.67 nM (S/N = 3). The sensor exhibited a good selectivity for detecting DA. This research is expected to provide new ideas and references for constructing high-performance sensing interfaces and platforms. Graphical abstract
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Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Liwei Sun,Meilin Yin,Shaokun Tang
In this work, short-chain bi-functionalized ionic liquid (IL) was grafted onto mesoporous alumina (MA) for ideal CO 2 /N 2 selectivity . First, bi-functionalized IL 1-(2-carboxymethyl)-3-methoxyethyl-imidazolium bromide ([CmMOEim][Br]) with ether and carboxyl group was successfully synthesized and the initial decomposition temperature is 165 °C. Then low-cost hydroxyl-MA (MA-OH) was obtained from ordered MA (OMA) with the assist of 30 wt% H 2 O 2 solution to prepare [CmMOEim][Br]-grafted MA with different molar ratios of [CmMOEim][Br] and MA-OH via facile chemical reaction without the introduction of alkoxysilanes . MA-OH material presents slit-like structure and more hydroxyl groups compared to OMA sample before hydroxylation. Crystal structure and morphology of grafted material remains unchanged after grafting process. [CmMOEim][Br] is successfully grafted onto MA-OH via the chemical link of carboxyl group on IL and hydroxyl group on MA-OH. Finally, CO 2 and N 2 capture capacities of different materials were separately evaluated at 0.1 MPa and 25 °C. With the increase of IL dosage, CO 2 capture capacity of the grafting material first enhances and then decreases while N 2 capture capacity gradually falls owing to the high CO 2 affinity of [CmMOEim][Br]. Wherein, [CmMOEim][Br]-grafted MA-0.15 exhibits the optimum CO 2 capture capacity of 45.3 cm 3 /g at 25 °C and ambient pressure. The ideal CO 2 /N 2 selectivity of [CmMOEim][Br]-grafted MA can reach up to 30 based on single-component adsorption isotherms , which is higher than that of [CmMOEim][Br] and MA-OH. Furthermore, CO 2 capture capacity, morphology and structure of [CmMOEim][Br]-grafted MA maintain well even after ten cycles.
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Catalysts
·
2021
·Vol. 11
·期 4
·489
·
IF 4.146
Hongchen Song,Jing Sun,Tingting Shen,Lang Deng,Xikui Wang
The increasing concentration of residual ciprofloxacin (CIP) can cause potential harm to the environment. Photocatalysis has been regarded as an effective method for the degradation of CIP. Bi/BiVO4with excellent photocatalytic performance was synthesized partial reduction with NaBH4. The structure, morphology, composition, and optical performance of BiVO4and Bi/BiVO4were characterized by a variety of techniques. The results showed that the Bi/BiVO4exhibits high photocatalytic activity in the degradation of CIP. Comparison of BiVO4and Bi/BiVO4has lower photoluminescence intensity and higher photocurrent responses intensity. The introduction of Bi made Bi/BiVO4have a higher charge separation efficiency and generate more active free radicals. In addition, the radical trapping experiments revealed that superoxide free radicals and holes were the main active free radicals during the degradation of CIP. The pathway of CIP degradation was investigated through high performance liquid chromatography-mass spectrometry, and a possible degradation mechanism was proposed.Keywords:BiVO4;bismuth;photocatalysis;CIP
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Journal of Physical Chemistry C
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2021
·
IF 4.126
Sen Yang,Shunfa Gong,Zhilong Zhou,Lifang Wu,Minmin Zhang,Lilin Jiang,Wenzhi Wu
The optical and thermometric properties of bismuth (Bi) and ytterbium (Yb) codoped double perovskite Cs2Ag0.6Na0.4InCl6 microcrystals (MCs) are investigated, which possess high photoluminescence quantum yield and stable broadband spectra from visible to near-infrared (NIR) region. Thermal quenching and dynamic properties are shown using temperature-dependent steady-state photoluminescence (PL) and time-resolved PL (TRPL) techniques, which reveal the transition mechanism from self-trapped excitons (STEs) to Yb dopants. Taking advantage of the diverse thermal quenching of distinct PL between STEs and Yb3+ emissions, an optical thermometer based on the fluorescence intensity ratio is designed in the visible and NIR region, which can provide a self-referenced temperature with high sensitivity. The maximum absolute and relative sensor sensitivities are 0.113 K–1 and 1.66% K–1, respectively. These characteristics all demonstrate that Bi/Yb codoped Cs2Ag0.6Na0.4InCl6 MCs can be excellent and novel luminescent materials for non-contact temperature measurement.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Hongyuan Yang,Jiexian Liu,Ziliang Chen,Ruirui Wang,Ben Fei,Huixiang Liu,Yanhui Guo,Renbing Wu
Prussian blue analogues (PBA) have been explored as electrocatalyst for the hydrogen evolution reaction, however, they suffer from poor electrical conductivity and blocked active sites and thus usually operate at overpotentials drastically above thermodynamic requirement. Herein, we report a creation of unconventional anion (cyano group) and cation (cobalt) bi-vacancies to boost CoFe-PBA for HER through a rapid tannic acid (TA) etching strategy. The combined experimental and theoretical investigations indicate that the introduction of bi-vacancies would be favorable to exposure of accessible active sites, optimizing the electron density of CoFe PBA, and lowering the reaction energy barrier. As a result, the TA-etched CoFe PBA nanocubes supported on nickel foam (NF) (CoFe-PBA@TA/NF) exhibit outstanding HER catalytic activity with an overpotential of only 86 mV at 10 mA cm −2 , which is not only significantly lower than bare PBA supported on NF (158 mV), but also comparable to the commercial Pt/C catalyst.
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Royal Society Open Science
·
2021
·Vol. 8
·期 1
·
IF 2.963
Chao Chen,Xiaoxin Zhang,Hao Huang,Hongyi Bao,Xiaodong Li,Ye Cheng,Jing Zhang,Yin Ding,Yanguang Yang,Haiying Gu,Donglin Xia
Oxidative stress has been implicated in the pathogenesis of cognitive impairment. Lead (Pb) is a common environmental toxicant and plays a vital role in oxidative stress activation. In this study, a superoxide dismutase (SOD) and catalase (CAT) containing poly (lactic-co-glycolic acid) (PLGA) meso-particles (PLGA@SOD-CAT) were prepared to attenuate cognitive impairment via inhibiting oxidative stress in rats. It was prepared using a double emulsion (water/oil/water phase) technique to minimize the hazardous effects of Pb burden on cognitive impairment. The meso-particles antagonized the Pb-induced cognitive impairments. Behaviour, serum biochemical parameters and biomarkers of oxidative stress in rats were evaluated after they were subjected to intravenous injection with lead nitrate and PLGA@SOD-CAT. Moreover, the potential protective mechanism of PLGA@SOD-CAT was determined. Notably, PLGA@SOD-CAT appreciably agented memory impairment caused by lead nitrate and it could significantly inhibit Pb-induced oxidative stress in the blood. Furthermore, a remarkable reversion effect of cognitive impairments, including escape latency, crossing platform times and time per cent during the platform quadrant, after PLGA@SOD-CAT administration were noted. Therefore, these results suggested that the bi-enzymes platform was a superior product in eliminating Pb-induced cognitive impairments through reducing expression of Pb-associated oxidative stress, and it could potentially be applied in detoxifying heavy metals in blood circulation.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Bingyu Gao,Qi Cao,Xingyu Pu,Jiabao Yang,Jian Han,Shuangjie Wang,Tongtong Li,Ziwei He,Xuanhua Li
SnO 2 is regarded as the most promising electron transporting layer (ETL) material for perovskite solar cells (PSCs). Various functional groups are introduced onto the SnO 2 surface by interface modification with the purpose of improving the performance of the PSCs. However, most of the modifications are achieved in two-step approach, which are complicated and not easily realized. Here, we employ a facile one-step, low-temperature, and effective method to synthesis urea-complexed SnO 2 ETL (referred as Urea-SnO 2 ). The –NH 2 groups on Urea-SnO 2 attributes to facilitate the charge transfer within the SnO 2 ETL and reduce trap state density in the perovskite film through the chemical interactions. Therefore, The PSCs based on the Urea-SnO 2 ETL exhibit a champion power conversion efficiency (PCE) of 20.25%, which is more excellent than the devices based on the pristine SnO 2 ETL (17.60%). Functionalization of SnO 2 in situ by the precursor solution method offers an efficient method for high performance planar PSCs.
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