CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 35
·期 7
·1086-1090
·
IF 1.852
Youjun Guan,Qi Shi,Jinxiang Dong
1D compound [Zn(Im)(HIm) 2 (OAc)] was used as a single precursor of metal and imidazole to prepare several 3-dimensional (3D) Zn(Im) 2 frameworks by solution-mediated transformation. Specifically, three known topologies, zni, coi and crb (BCT) were obtained using a solution-mediated transformation with CH 3 OH, DMF and DMA as solvent, respectively. Structural studies by 13 C MAS NMR spectroscopy and TG imply that in the transformation process from 1D compound to coi-[Zn(Im) 2 ]•(DMF) x and crb-[Zn(Im) 2 ]•(DMA) x (ZIF-1), DMF and DMA solvent molecules acted as structure-directing agent and, therefore, were occluded inside the framework, respectively. In contrast, in the formation of zni-[Zn(Im) 2 ], no solvent molecules were present in the frameworks; therefore the transformation from 1D compound to zni was induced by temperature. Thus, solution-mediated transformation of a single precursor (1D compound) approach was established for the synthesis of ZIFs.
研究领域:
材料化学
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配位化学
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DOI
高影响因子
Molecular Catalysis
·
2017
·
IF 0
Yanping Zhu,Minwang Laipan,Runliang Zhu,Tianyuan Xu,Jing Liu,Jianxi Zhu,Yunfei Xi,Gangqiang Zhu,Hongping He
A novel and efficient photocatalyst was synthesized by surface hybridizing Zn/Ti-LDH (LDH) with C60 molecules. The structural characteristics of the resulting products (C60/LDH) were studied using a variety of characterization methods, and the photocatalytic activities of C60/LDH were tested using Orange II (OII) as a model contaminant under simulated solar irradiation. The FT-IR spectra showed that the characteristic mode of C60 at 1182 cm −1 split into two peaks at approximately 1240 and 1156 cm −1 ; in addition, the Raman spectra showed the band at 1422 cm −1 for C60 was upshifted to 1431 cm −1 with the increased doping amount of C60. In addition, the XPS spectra revealed that the peaks of O1s, Zn 2p, and Ti 2p were downshifted slightly. These results demonstrated that chemical interaction existed between C60 and LDH on C60/LDH. The UV–vis diffuse reflectance spectra confirmed that the absorbance of C60/LDH in visible-light region enhanced markedly, as compared with that of pristine LDH. The photoluminescence (PL) spectroscopic measurement revealed that the C60/LDH composites exhibited much weaker PL intensity than that of LDH sample, and the transient photocurrent ( I – V ) analysis showed that C60/LDH had higher photocurrent density than pristine LDH. The results of PL spectra and I–V analysis suggested that C60 molecule could effectively transfer the photoelectrons from the conduction band of LDH, leading to a lower recombination rate of the photo-induced electrons and holes. The photocatalytic experiments showed that C60/LDH had much higher photocatalytic activity in the decolorization of OII than that of pristine LDH, and 2%C60/LDH composite exhibited the highest photocatalytic activity. Furthermore, the stability test indicated that the decolorization efficiency of OII by 2%C60/LDH was still quite efficient after being used for 5 cycles.
研究领域:
材料科学
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环境科学
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DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xin Wang,Cuiping Xie,Jiasong Zhong,Xiaojuan Liang,Weidong Xiang
Highly luminescent AgInS 2 –ZnS quantum dots were obtained by a one-pot two steps hot injection approach. The effect of the reaction time on the properties of the quantum dot was systematically investigated. By the introduction of Zn ions , the emission peak was blue-shift from 638 nm to 584 nm in 15 min, while the emission peaks of the obtained AgInS 2 –ZnS quantum dots were tuned in a narrow range with a bit red-shift from 584 to 589 nm as the reaction was continued. The highest photoluminescence quantum yield (PL QY) was up to about 72% when the reaction was prolonged to 15 min. Further, results showed that the morphologies were varied as the reaction was continued. In addition, the PL decay curves demonstrated that the component of PL bands resulted from Zn doping was observed, while the PL behavior was originated from the donor-acceptor recombination.
研究领域:
材料科学
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光学
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DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 24
·8319-8332
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IF 6.482
Zhanwei Zhou,Jiuyuan Xu,Yuxuan Liu,Chen Wei,Hengyang Zhang,Qun Wang
The B-site doping of organic–inorganic lead halide perovskites of the form MAPbX3 is not only an effective way to improve energy conversion (solar-electrical, thermal-electrical, solar-chemical, etc.) performance, but it is also eco-friendly, reducing the toxic Pb content. To the best of our knowledge, there are few reports on the photocatalytic and thermoelectric properties after the partial doping of Zn2+ into the Pb2+ lattice sites of perovskite MAPbBr3 crystals fabricated through a solvothermal route (Zn–MAPbBr3). Systematic characterization, including XRD, EDS, XPS, UV-vis, PL, N2 adsorption/desorption, Hall measurement, time-resolved photoluminescence measurement (TRPL), and electrochemical analysis, showed that the smaller Zn2+ guests increase the Goldschmidt tolerance and octahedral tilting factor of MAPbBr3 and enhance the carrier concentration, carrier mobility and conductivity, active site number, and oxidation abilities of Zn–MAPbBr3. Finally, Zn–MAPbBr3 crystals exhibited an improved absorption capacity and better photocatalytic degradation performance toward RhB dye and improved thermoelectric transportation properties, including better electrical conductivity and a more positive Seebeck coefficient, compared with pristine MAPbBr3.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Bin Deng,Yating Li,Weihua Tan,Zhaoxi Wang,Ziwei Yu,Shuya Xing,Heng Lin,Hui Zhang
Mn-Zn ferrite (Mn 0.6 Zn 0.4 Fe 2 O 4 ) was prepared by a gel method using spent alkaline Zn-Mn batteries as raw materials and employed as catalyst to degrade bisphenol A (BPA) by electro-enhanced heterogeneous activation of peroxydisulfate (PDS). The effects of initial pH, current density, PDS concentration, and Mn-Zn ferrite dosage on BPA removal were investigated. The formation of reactive radicals was verified by electron paramagnetic resonance (EPR) spectroscopy. The results of radical quenching experiments indicate that surface-bound sulfate and hydroxyl radicals played an important role in BPA removal. The stability of Mn 0.6 Zn 0.4 Fe 2 O 4 catalyst was investigated by cycling experiments, which indicates Mn 0.6 Zn 0.4 Fe 2 O 4 is stable and can be reused. This work also provides an alternative way for the reutilization of spent alkaline Zn-Mn batteries.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHEMISTRY
·
2022
·Vol. 90
·期 2
·027006-027006
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IF 1.777
Aimin LIU,Mengxia GUO,Yubao LIU,Fengguo LIU,Xianwei HU,Zhongning SHI
In this work, the Zn–Ta coating was electrodeposited from DMI–ZnCl2–TaCl5 solvate ionic liquid. The electrochemical reaction was studied by cyclic voltammetry using titanium as working electrode. The onset potential of zinc and tantalum co-deposition was −0.7 V (vs. Ag). Moreover, potentiostatic electrodeposition experiments were conducted to investigate the influence of potential and temperature on the morphology of the coating. X-ray photoelectron spectroscopy analysis confirmed that the coating obtained by electrodeposition at −1.6 V (vs. Ag) and 353 K was composed of Zn, Ta, ZnO, and Ta2O5. The mass fraction of element tantalum was 6.21 %, and metallic tantalum accounted for 11.54 % of the mass of element tantalum. The corrosion current density of the Zn–Ta coating was 1.83 × 10−4 A cm−2.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Xiaoqian Jing,Yang Xu,Zizheng He,Dongyun Li,Rui Wang,Minjia Wang
Sb 2 Se 3 is a promising light-absorbing material with low cost and good photocatalytic activity. In this paper, Sb 2 Se 3 thin films doped with zinc (Zn) were deposited on ultra-white glass by hydrothermal method, using ZnCl 2 , sodium selenate and antimony potassium tartrate as raw materials. And the photocatalytic activity was evaluated by photocatalytic decolorization reaction with methylene blue (MB) solution. The results showed that the highest photocatalytic activity was displayed when Zn 2+ was doped with 0.10 mmol, and its degradation rate of methylene blue was 1.66 times higher than that of pure Sb 2 Se 3 . Zn 2+ doped Sb 2 Se 3 film can effectively inhibit the recombination of electron-hole pairs, thereby improving the optical activity. According to the free radical capture experiment, photogenerated holes (h + ) and superoxide radicals (·O 2− ) are the decisive active substances in the photocatalytic process. This method provides a reliable way for transition metal ions doped metal selenides to degrade organic dyes.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Minghao Zhou,Shijiao Zhang,Yanlai Wang
By employing semiconductor composite strategies and morphology control, Zn-doped CuInS 2 quantum dots with a ZnS shell structure (ZCIS@ZnS QDs) have been synthesized and combined with TiO 2 nanowires or nanoparticles (NWs/NPs) for photodetector applications. In the composite material, the QDs are uniformly attached to the surface of TiO 2 NWs/NPs. The photodetector constructed with ZCIS@ZnS QDs and TiO 2 NWs/NPs (ZCIS@ZnS@TiO 2 NWs/NPs) demonstrated superior photodetection performance. It exhibited excellent responsivity (∼6.2 mA/W) and detectivity (∼1.6 × 10 12 Jones) under ultraviolet (UV) illumination (∼365 nm). This non-toxic and environmentally friendly composite material provides a promising alternative for applications in various fields.
研究领域:
材料科学
·
光电子学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 2
·1286-1296
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IF 2.599
Cao Sheng,Zheng Jinju,Dai Chencheng,Wang Lin,Li Chengming,Yang Weiyou,Shang Minghui
In this report, doping concentration-dependent photoluminescence (PL) properties of Mn-doped ternary Zn–In–S quantum dots (QDs) were studied by using steady-state and time-resolved PL spectroscopy. The QDs PL was firstly significantly intensified with the increasing Mn doping concentration and then decreased after the doping concentration increased up to 7.5 at.%. However, their decay lifetimes exhibit a monotone decrease with Mn doping concentration ranged from 0 to 10 at.%. It can be concluded that the PL intensity was mainly determined by two factors: one was the increased efficiency of energy transfer from host excitons to Mn 2+ ion accepter, and the other was the decreased efficiency of the emission from a Mn 2+ ion, which was caused by the increased component of exposed Mn 2+ ions on QDs surface and the accelerated interaction between adjacent dopants. The competition of above two exciton relaxation dynamics processes determined the trend of the PL intensity, while the latter was responsible for the monotonously decreased lifetime of the Mn 2+ ion emission with the increasing Mn doping concentration.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanan Wei,Qian Zhang,Yuan Han,Xinyu Xu,Wenmeihui Zhao,Ying Hu,Rongmei Liu,Guixiang Qian,Zhongliang Tian,Chao Yang
In China, 80 % of lithium resources are in the salt lakes of the Tibetan Plateau, although the Mg 2+ /Li + ratios in them are too high, limiting the development of China’s lithium extraction industry from the salt lakes. This study investigates the potential of the LiMn 2 O 4 -Zn cell system for lithium extraction from brines with high Mg 2+ /Li + ratios. The system demonstrates excellent selectivity for Li + and efficiently extracts Li + even in brines with Mg 2+ /Li + ratios as high as 100:1 (wt%). The system operates stably at various brine concentrations, particularly in high-salinity environments. The study also investigates the kinetic performance of the LMO-Zn system, revealing optimal performance at high Li + concentrations and moderate current densities. The LiMn 2 O 4 -Zn cell system presents a promising approach for lithium extraction from brines, offering high selectivity, reversibility, and adaptability.
研究领域:
材料科学
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能源工程
·
环境科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 45
·19220-19228
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IF 2.7
Peng Lu,Qianwen Hu,Kui Wang,Shiyong Chen,Zongxiao Li,Xinjie Chen,Chuang Xing,Yanhong Wang,Ce Du
The efficient CO2 conversion to light olefins through hydrogenation is a feasible strategy to achieve carbon neutrality goals. Herein, a series of bimetallic Zn–Zr/supports are synthesized by a conventional impregnation method. We demonstrate that different supports endow catalysts with various specific surface areas, pore sizes, chemical adsorption performances, and acid densities. The effects of different support-loaded Zn–Zr coupled with SAPO-34 on CO2 hydrogenation to light olefins are investigated systematically. The CO2 conversion of Zn–Zr/Q10-SAPO-34, Zn–Zr/Q50-SAPO-34, Zn–Zr/γAl2O3-SAPO-34, Zn–Zr/MgO-SAPO-34 and Zn–Zr/S-1-SAPO-34 is 11.4%, 9.2%, 24.0%, 8.8%, and 16.2%, respectively, with corresponding light olefin selectivity of 39.0%, 28.1%, 30.4%, 4.8%, and 14.7%, respectively. Significantly, γAl2O3 is more conducive to CO2 conversion, while Q10 tends to produce light olefins. This work provides an effective reference for support selection in CO2 hydrogenation to light olefins.
研究领域:
化学工程
·
环境科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 44
·20279-20285
·
IF 3.3
Xiaoqian Peng,Jing Zhang,Xu Zhang,Xiaochan Liu,Zhiqiang Huang,Haibo Li,Xibin Yi
Hydrogen is regarded as one of the most promising energy sources of the future, due to its low-cost, zero-pollution, and high-heat value. Nevertheless, traditional methods of storing hydrogen are commonly accompanied by the risk of leaks and explosions, so how to store and transport hydrogen safely and efficiently is a critical issue that needs to be addressed. Solid-state hydrogen storage is the most attractive way to store hydrogen in nanomaterials by chemical or physical adsorption, which has the advantages of high energy density and good safety. Here, a rational Ni–Zn bimetallic MOF has been constructed by a straightforward synthetic technique, in which the Zn atom was partially replaced by the Ni atom. The micropore rate of the Ni–Zn bimetallic MOFs is higher than that of ZIF-8. In addition, the presence of Ni provides more unsaturated metal sites and strengthens the bonding between hydrogen molecules and Ni, effectively improving the hydrogen storage capacity of Ni–Zn bimetallic MOFs. The experimental results show that the hydrogen adsorption capacity of Ni–Zn bimetallic MOFs can reach 1.35 wt% at 77 K and 1 bar.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）