Catalysts
·
2021
·Vol. 11
·期 2
·174
·
IF 4.146
Jing Zhang,Li Wang,Wenwen Liu,Mengsha Cao,Jing Zhang,Ningyi Yuan,Shuai Zhang,Zhongze Gu
The surface modification of perovskite nanocrystals (NCs) (i.e., their decoration with noble metals) holds great promise with respect to the tailoring of their properties but has remained a challenge because perovskite NCs are extremely sensitive to water and alcohols. In this study, Au or Pt@CsPbBr3NCs were successfully synthesized by photoreduction at the water/hexane interface. First, Cs4PbBr6NCs were synthesized through the hot-injection method. Then, Cs4PbBr6was transformed into CsPbBr3and subjected to noble metal modification, both at the interface. The synthesized CsPbBr3NCs exhibited a cubic perovskite phase and had an average size of approximately 13.5 nm. The deposited Au and Pt nanoparticles were crystalline, with a face-centered cubic lattice and average diameters of approximately 3.9 and 4.4 nm, respectively. The noble metal modification process had almost no effect on the steady-state photoluminescence (PL) emission wavelength but affected the charge-recombination kinetics of the CsPbBr3NCs. Time-resolved PL decay spectral analysis indicated that the fluorescence lifetimes of the Au and Pt@CsPbBr3NCs were shorter than those of the pure CsPbBr3NCs, probably owing to the quenching of the free charges because of electron transfer from the perovskite to the noble metal nanoparticles.Keywords:perovskite nanocrystals;noble metal;interface;photoreduction
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
Small
·
2015
·Vol. 11
·期 29
·3583-3590
·
IF 8.368
Xintao Luo,Wei Xin,Chenhui Yang,Dong Yao,Yi Liu,Hao Zhang,Kai Zhang,Bai Yang
Two-dimensional (2D) nanomaterials and heterostructured nanocrystals (NCs) are two hot topics in current nanoresearch. However, reports on heterostructured NCs with 2D features are still rare. In this work, we demonstrate a one-pot colloidal chemistry route for synthesizing Au-CuZnSe 2 heterostructures with spherical Au domains attached to the edge of a sheet of CuZnSe 2 . This protocol involves the preferential formation of Au clusters and the seeded growth of CuZnSe 2 sheets because of the lattice matching of CuSe with Au. As an example to demonstrate the importance of such heterostructures, the electrochemical performance of Au-CuZnSe 2 heterostructured nanosheets is compared with that of heterostructured nanorods, Au NCs, and CuZnSe 2 NCs. The heterostructured nanosheets exhibit the best electrochemical activity.
研究领域:
材料科学
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纳米技术
·
电化学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2019
·Vol. 12
·期 12
·1950
·
IF 2.972
Shengding Chang,Muwei Ji,Changxu Yan,Kai Zhang,Qian Deng,Jian Xu,Caizhen Zhu,Bo Li,Jin Wang
KTaO3/Au hetero-nanostructures were synthesized by in-situ reduction of HAuCl4on the surface of hydrothermally-grown KTaO3sub-micron cubes. The concentration of Au source was found to be a critical factor in controlling the hetero-nucleation of Au nanoparticles on the surface of KTaO3sub-micron cubes. Loading of Au particles on KTaO3nanocrystals enriched KTaO3additional UV-vis absorption in the visible light region. Both KTaO3and KTaO3/Au nanocrystals were shown to be active in the photo-degradation of p-nitrophenol, while the loading of Au on KTaO3clearly improved the photo-degradation efficiency of p-nitrophenol compared to that on bare KTaO3nanocrystals, probably due to the improved light absorption and charge separation.Keywords:in-situ synthesis;KTaO3/Au hetero-nanostructures;concentration of Au source;photo-degradation of p-nitrophenol
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiaojing Yu,Haoran Qiu,Zhe Wang,Bin Wang,Qingnan Meng,Shaodong Sun,Yufei Tang,Kang Zhao
Aiming at comparing the charge separation efficiencies of various heterojunctions, such as p-n junction, metal–semiconductor junction, Z-scheme junction, TiO 2 -Au, TiO 2 -BiOI, TiO 2 -BiOI-Au and TiO 2 -Au-BiOI were synthesized by using n-type TiO 2 , p-type BiOI and plasmon metal Au as components for photocatalytic nitrogen fixation. The as-prepared “Z-scheme” TiO 2 -Au-BiOI photocatalyst showed the highest photocatalytic performance for N 2 photofixation with 543.53 μmol L −1 h −1 g −1 in the pure water system, which is 1.68 times higher than that of TiO 2 -BiOI-Au nanocomposite, 1.85 times higher than that of TiO 2 -BiOI and 6.69 times higher than that of TiO 2 -Au, revealing superiority of the heterojunctions of TiO 2 -Au-BiOI in kinetics among these different heterostructured photocatalysts during the photocatalytic N 2 reduction process. Moreover, the as-prepared TiO 2 -Au-BiOI exhibited considerable performance under real natural environment, showing a promising potential in future application.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Water
·
2023
·
IF 5.3
Lijuan Wang,Jiawei Li,Gansheng Zhong,Jiangpeng Li,Xiao Lu,Siqing Wang,Yuanyuan Tang
To face the current critical challenges of gold recovery and beneficial utilization of solid waste, this study synthesized diatom biochar from the anoxic pyrolysis of diatoms and proved the superiority of the diatom biochar as a novel adsorbent for Au(III) in both synthetic and real electroplating wastewaters. The diatom biochar was found to have a high adsorption capacity of 443.0 mg/g and a superior recovery efficiency of up to 92.1%. The Au(III) adsorption kinetics followed the pseudo-second-order and intraparticle diffusion models. Electrostatic attraction and reduction were detected as the major adsorption mechanisms. An exceptional selectivity was also observed for the diatom biochar toward Au(III) with other coexisting heavy metals. Even in the presence of CN– in the solution, the diatom biochar still exhibited superiority in Au(III) adsorption. Owing to its high affinity to Au(III), the diatom biochar was successfully applied in real electroplating wastewater containing trace Au(III), with an adsorption efficiency as high as 96.7%. These findings sufficiently demonstrate the excellent performance and economic feasibility of diatoms for Au(III) recovery from electroplating wastewater, which also promoted solid waste minimization of diatom biorefineries.
研究领域:
环境科学
·
材料科学
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废物管理
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水处理
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Ning Sui,Fengya Liu,Ke Wang,Fengxia Xie,Lina Wang,Juanjuan Tang,Manhong Liu,William W. Yu
In this work, gold nanoparticles were synthesized, the introduction of Hg 2+ led to the formation of Au-Hg amalgam , which was found to possess an enhanced peroxidase-mimicking activity towards H 2 O 2 -mediated oxidation of 3, 3′, 5, 5′-Tetramethylbenzidine (colorless) to produce a blue product. This color reaction was exploited as a sensitive and selective method for colorimetric detection of Hg 2+ and H 2 O 2 , the linear ranges were 0.1–5 nM and 0.5–100 μ M, respectively. Furthermore, a test strip was successfully designed, it exhibited high sensitive, rapid and low cost for Hg 2+ and H 2 O 2 detection. More importantly, the colorimetric method could be successfully applied to real sample application in solution and in a test strip.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 14
·5355
·
IF 4.6
Keyan Chen,Shiqi Fu,Chenyu Jin,Fan Guo,Yu He,Qi Ren,Xuesheng Wang
Smartphone-assisted fluorescence and colorimetric methods for the on-site detection of Hg2+and Cl−were established based on the oxidase-like activity of the Au–Hg alloy on the surface of Au/Cu/Ti3C2NSs. The Au nanoparticles (NPs) were constructed via in-situ growth on the surface of Cu/Ti3C2NSs and characterized by different characterization techniques. After the addition of Hg2+, the formation of Hg–Au alloys could promote the oxidization of o-phenylenediamine (OPD) to generate a new fluorescence emission peak of 2,3-diaminopenazine (ADP) at 570 nm. Therefore, a turn-on fluorescence method for the detection of Hg2+was established. As the addition of Cl−can influence the fluorescence of ADP, the fluorescence intensity was constantly quenched to achieve the continuous quantitative detection of Cl−. Therefore, a turn-off fluorescence method for the detection of Cl−was established. This method had good linear ranges for the detection of Hg2+and Cl−in 8.0–200.0 nM and 5.0–350.0 µM, with a detection limit of 0.8 nM and 27 nM, respectively. Depending on the color change with the detection of Hg2+and Cl−, a convenient on-site colorimetric method for an analysis of Hg2+and Cl−was achieved by using digital images combined with smartphones (color recognizers). The digital picture sensor could analyze RGB values in concentrations of Hg2+or Cl−via a smartphone app. In summary, the proposed Au/Cu/Ti3C2NSs-based method provided a novel and more comprehensive application for environmental monitoring.Keywords:Au/Cu/Ti3C2NS;Au–Hg alloy;oxidase-like activity;smartphone;colorimetric detection
研究领域:
环境科学
·
分析化学
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材料科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Huan Liu,Yi Lin,Zhen Ma
Au/M-P-O (M = Mg, Al, Ca, Fe, Co, Zn, La) catalysts were prepared by loading ca. 1 wt.% gold onto commercial metal phosphate supports by deposition-precipitation with urea (DPU), and tested in CO oxidation. Au/La-P-O showed the highest activity, achieving complete CO conversion at 70 °C. Au/Ca-P-O was the second most active, achieving complete CO conversion at 155 °C. The remaining catalysts were not active below 200 °C. In view of the results, we additionally prepared Au/LaPO 4 nanowires by loading ca. 1 wt.% gold onto LaPO 4 nanowires via DPU. The Au/LaPO 4 nanowires catalyst was even more active, achieving complete CO conversion at 15 °C. The catalysts were characterized by N 2 adsorption-desorption, inductively coupled plasma optical emission spectroscopy (ICP-OES), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and temperature-programmed desorption of O 2 or CO 2 (O 2 -TPD, CO 2 -TPD). Reasons for the higher activity of Au/LaPO 4 nanowires were discussed.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
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2022
·
IF 4.217
Yong Xiang,Yun Liu,Mingjie Li,Wencai Bai,Guoji Liu,Li Xu
The significance of recycling gold is self-evident. However, existing technologies for recovery of gold show several disadvantages, including their high costs, difficulty to recover adsorbent, as well as low adsorption capacity. Thus, an ecofriendly gold recovery system with low cost and high efficiency should be developed. In this study, a novel RFT-SA adsorbent (RFT:SA = 1:1) was developed, which was achieved by wrapping the self-assembled resorcinol-formaldehyde-thiourea (RFT) in sodium alginate (SA) hydrogels. This study suggests that it can make up for the shortcomings of powder adsorbent RFT that is difficult to collect, and it can fully use the high adsorption capacity and high selectivity of RFT. The RFT-SA adsorbent exhibited high adsorption capacity as Au(III) reached 603.4 ± 24.6 mg g −1 of M Au / M dry-gel . It is noteworthy that RFT-SA exhibited excellent selectivity to Au(III) in simulated electronic waste leachate containing Au(III) and other competing ions, thus suggesting that RFT-SA can recover gold efficiently under complex conditions. This study can provide a new idea for designing a novel type of adsorbents for precious metal ions with high adsorption capacity, high selectivity and being easy to collect for the efficient recovery of precious metals from electronic waste leachate.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hao Tang,Zi Ang Chen,Muchen Wu,Shunbo Li,Ziran Ye,Mingjia Zhi
Tuning the size of Au nanoparticles is always an interesting task when constructing Au/semiconductor heterojunctions for surface plasmon resonance-enhanced photocatalysis. In particular, the size of Au nanoparticles in the newly emerging “plasmonic aerogel” photocatalyst concept could approach the size of the semiconductor phase. This work provides an alternative route to realize the size tuning of Au nanoparticles in Au-CeO 2 composite aerogels to some extent, within the framework of the well-established epoxide addition sol–gel method. The size tuning is achieved by exploiting the multi-functionalities of a mixed organic acid additive containing a thiol group in the gelation step. The obtained aerogel photocatalysts are composed of a porous backbone of interconnected CeO 2 nanoparticles and Au nanoparticles, and the size of Au nanoparticles ranges from ∼30 nm to sub-10 nm, while the size of CeO 2 remains at ∼15–10 nm. The surface plasmon resonance peak position and intensity contributed by the Au nanoparticles then vary accordingly. Photocatalytic CO 2 reduction at the gas–solid interface is chosen as a model reaction to study the effect of Au nanoparticle size on the photocatalytic activity of composite aerogel photocatalysts. The addition of Au nanoparticles undoubtedly enhances the overall activity of the CeO 2 aerogel photocatalyst, while the degree of enhancement (in terms of total charge consumption) and product selectivity (CH 4 or CO) are different and correlated with the size of the Au nanoparticles. The best performance can be achieved in a composite in which the Au sizes are the smallest.
研究领域:
材料科学
·
化学工程
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环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
DePing Chen,ZhenYi Shao,LiRong Yang,Ying Chen,Yanghong Wei,Zhihua Hu,Liyang Cai,Yifan Zhang,Xun He
The design of efficient electrocatalysts for ethanol oxidation is essential for commercializing direct ethanol fuel cells (DEFCs). In this strategy, a mesoporous carbon microsphere (MC) was first synthesized by inverting the micro-emulsion technique. The MC@Au/Pd catalyst with a particular core-shell structure was obtained by utilizing mesoporous carbon as a core to load the Au/Pd layer. The novelty of the MC@Au/Pd catalyst with specialized core-shell structures lies not only in the high specific surface area inherited from the carbon core but also in the strong electronic interactions caused by the lattice mismatch between the core (Au) and shell (Pd) atoms. Particularly, electrochemical measures demonstrated that the Au/Pd catalyst exhibits superior catalytic activity toward the ethanol oxidation reaction (EOR) compared with commercial Pd/C catalysts. This is mainly due to the high specific surface area and mesoporous pore size inherited from the core carbon microspheres. In addition, the mesoporous carbon core and Au/Pd shell in the well-organized core-shell catalyst (MC@Au/Pd) influence the catalytic activity for ethanol oxidation by adjusting the electronic structure of Pd.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1103
·
IF 3.9
Jinfeng Tian,Xing Wen,Wenfeng Hu,Li Luo,Wei Wang,Keying Lin,Haijuan Zhan,Baojun Ma
As non-noble metal co-catalysts, Nitrides have received extensive attention for their high efficiency and low cost in photocatalytic hydrogen production. In this study, we develop a novel composite co-catalyst of Au/Ta3N5that significantly enhanced the photocatalytic hydrogen production activity of CdS. The activity of photocatalyst (Au/Ta3N5)/CdS is 7.3 times of bare CdS and 2.2 times of Ta3N5/CdS. The proper capacitance and enhanced activity of Ta3N5demonstrates the capacitance catalysis effect of Ta3N5, which improves the charges separation and storing of the photoexcited electrons from CdS. Au acts as an active site for proton reduction to further improve the activity.Keywords:co-catalyst;Ta3N5;capacitance catalysis;photocatalytic hydrogen production
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）