APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Liping Man,Quanlong Xu,Wenhao Li,Wei Chen,Weiwei Zheng,De-Kun Ma
Oxygen vacancies (OVs) can adjust surface and electronic structures of materials and behave as active sites, extend spectral responsive range, and promote the transfer and separation of photogenerated carriers. Therefore surface properties and photocatalytic activities of materials can be enhanced via the incorporation of OVs . However, the influences of OV concentration inside a material on its adsorption ability for heavy metal ions associated with surface and photocatalytic activities under different atmospheres are still unexplored. In this work, in order to obtain highly efficient adsorbents and photocatalysts, rose-like Bi 2 O 2 CO 3 hierarchical microspheres with rich OVs (Bi 2 O 2 CO 3 -ROVs) and deficient OVs (Bi 2 O 2 CO 3 -DOVs) were synthesized through a facile hydrothermal route and H 2 O 2 oxidation treatment, respectively. Bi 2 O 2 CO 3 -ROVs hierarchical microspheres showed 2.4-times larger adsorption capacity than Bi 2 O 2 CO 3 -DOVs counterparts. The former also showed significantly enhanced photocatalytic activity for Rodamine B (RhB) degradation in aqueous solution under air, N 2 , and Ar atmospheres than the latter, especially under anaerobic conditions. Our work demonstrated that OV engineering could provide a new strategy for enhancing adsorption capability and photocatalytic activity under both aerobic and anaerobic conditions of materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yongfeng Liu,Jiangtao Zhang,Xiaojun Du,Yang Cao,Youyi Sun
Here, the Ag nanoparticles decorated graphene (AgNP@GNs) were fabricated by combing liquid phase exfoliation with in-situ solvent reduction method. Furthermore, the electrochemical sensitivity toward Cd 2+ and Pb 2+ ions was also investigated in detail. This AgNP@GNs presented the excellent electrical properties (2.5×10 4 S/m), meanwhile showed high electrochemical detection ability toward Cd 2+ and Pb 2+ . The sensitivity of AgNP@GNs toward Pb 2+ and Cd 2+ was ca. 15.2μA/μM (or 1246.4μA/μg L -1 ) and 0.09μA/μM (4.32μA/μg L -1 ), respectively. The AgNP@GNs was also evaluated to electrochemical detection of Cd 2+ and Pb 2+ in real water, in which the recoveries (96~124%) were obtained. The work does not only provide a facile method to synthesize AgNP@GNs with good dispersion, but also showed good electrical properties for various applications.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 17
·1-9
·
IF 2.8
Xu Changyuan,Yin Hongming,Song Wenqiang,Wang Qun,Zhao Fengjiao
When employing the conventional melt quenching technique for the preparation of Mn 2+ -doped glasses, it is observed that Mn 2+ readily undergoes oxidation to Mn 3+ during high-temperature melting. Typically, researchers incorporate reducing agents into the synthesized raw materials or utilize a reducing atmosphere when preparing samples to mitigate this phenomenon. In this study, a novel approach was proposed to suppress Mn 2+ oxidation and enhance its luminescent properties. The zinc phosphoborate glasses based on 28.1P 2 O 5 –10.9B 2 O 3 –28.1ZnO (P–B–Zn) were prepared using the traditional melt quenching method. The effect of Cd 2+ on the red emission of Mn 2+ was studied by doping 2.9 mol% Mn 2+ and changing the concentration of Cd 2+ in the glasses. The analysis of photoluminescence emission (PL) spectroscopy and photoluminescence excitation (PLE) spectroscopy revealed a significant enhancement in the red emission resulting from the 4 T 1 (G) → 6 A 1 (S) transition of Mn 2+ under 409 nm excitation after doping with Cd 2+ ions. When the doping content of Cd 2+ is 19 mol%, the luminescence intensity of Mn 2+ reaches its maximum value, which is 4.24 times higher than that of undoped Cd 2+ . The results of the absorption and transmission spectra indicate a weakening of the 5 E g → 5 T 2g transition of Mn 3+ and an increase in the transparency of the glasses. The significant reduction in the absorption peak of Mn 3+ suggests that doping Cd 2+ can effectively inhibit the oxidation of Mn 2+ to Mn 3+ , as further confirmed by X-ray photoelectron spectroscopy (XPS) analysis.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanoelectronics and Optoelectronics
·
2018
·Vol. 13
·期 12
·1807-1815
·
IF 1.069
Wang Zheng,Wang Yan-Shi,Tong Zhuang,Deng Qin,Luo Sheng-Xu
This paper reports the formation of novel adsorbent material based on undulating venus shell (UVS), white conch shell (WCS), conus conch shell (CCS) and abalone shell (AS). These absorbent materials were prepared by grinding the shells followed by high-temperature calcination process.
The prepared adsorbents were well characterized by scanning electron microscopy (SEM), X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy. Further, the effects of adsorbent dosage and temperature on the adsorption of Cd2+ by shell powder and related adsorption
isotherms were evaluated. The results indicated that the amount of adsorbent and temperature have a great influence on the adsorption process of the four adsorbents. Under optimized conditions, the four shell powders exhibited strong adsorption properties of Cd2+ which was consistent
with the Freundlich isotherm adsorption model. The optimal conditions for preparing shell powder adsorbents with the best adsorption performance were determined by evaluating the particle size, calcination temperature and calcination time during the preparation process and the prepared materials
were characterized by several techniques. The results demonstrated that the particle size of UVS powder was over 140 mesh at 450 °C with activation time of 60 min. Furthermore, the UVS powder exhibits apparent porous morphology after calcination and thus the specific surface area was markedly
increased. Consequently, the adsorption performance was significantly improved.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Lei Han,Xi Yuan,Zitong Wang,Jie Hua,Jin Wang,Jinju Zheng,Jialong Zhao
Mn-doped two-dimensional lead halide perovskites nanoplatelets (NPLs) possess promising application in solid state lighting. The Mn:L 2 [CsPbBr 3 ]PbBr 4 NPLs with corporation of Cd 2+ were prepared via a hot injection method. The photoluminescence (PL) properties the NPLs with different Mn/Pb/Cd molar ratio from 0.5/1/0 to 5/1/3 were investigated by steady-state and time-resolved PL spectroscopy, indicating that the doping efficiency of Mn 2+ can be boosted by adding Cd 2+ to the NPLs. After thermal annealing, the PL quantum yield of Mn 2+ ions reached up to 75%, which is Cd 2+ content dependent. The temperature-dependent PL spectra demonstrated that the thermal activation energies of the NPLs could be increased by incorporating Cd 2+ , meaning that the nonradiative defect/trap states were effectively suppressed. These experimental results suggested the PL properties of Mn:L 2 [CsPbBr 3 ]PbBr 4 NPLs were optimized by adding Cd 2+ ions.
研究领域:
材料科学
·
光电学
·
固态照明
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 46
·17512-17520
·
IF 8.067
Jizhong Liu,Hui Fu,Zhentao Du,Deliu Ou,Shixian Li,Qiaochu Chen,Weiyou Yang,Jialong Zhao,Jinju Zheng
The photothermal stability against light irradiation and high temperature of organic–inorganic hybrid perovskite nanocrystals (PNCs) is critically important for their applications in photoelectronic nanodevices. In the present work, we report the significantly enhanced photothermal stability of FAPbBr3 PNCs, which are fabricated by in situ growth of PNCs in polyvinylidene fluoride films (FAPbBr3@PVDF) with incorporation of Cd2+ ions. It is found that the introduced Cd2+ ions could effectively passivate the PNC defects and shorten the length of Pb–Br bonds, giving rise to the intensified interaction between Pb2+ and Br− in the [PbBr6]4− octahedron, which thereby suppresses the halogen ion migration under light irradiation and high temperature with enhanced photothermal stability. As a result, the Cd2+-doped FAPbBr3@PVDF film exhibits durable photothermal stability with 96% and 97% photoluminescence quantum yield (PLQY) retentions, under continuous blue-light irradiation (460 nm, 13 mW cm−2) for over 360 h, and under both a high temperature of 333 K and blue-light irradiation over 48 h, respectively. Furthermore, the as-constructed white light-emitting-diodes (WLEDs) deliver a wide color gamut (117% of NTSC standard) with chromaticity coordinates of (0.331, 0.337), verifying their promising applications in backlight sources.
研究领域:
材料科学
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纳米技术
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光电技术
✓ 已验证
DOI
高影响因子
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