Chemistry-An Asian Journal
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2020
·Vol. 16
·期 2
·165-173
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IF 4.056
Ying Duan,Yangyang Ma,Yanfu Xie,Dongmi Li,Dongsheng Deng,Chi Zhang,Yanliang Yang
The reasonable control of the dispersion of noble metals is an important topic for heterogeneous catalysts. In this manuscript, PdCu/C, AuCu/C and PdAuCu/C were prepared by the galvanic reduction method to ensure that Pd and Au follow the distribution of Cu nanoparticles. The catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive spectrometer elemental mappings and lines scans. Both the Pd and Au had very high dispersion no matter whether they were introduced individually or simultaneously. The Pd and Au were distributed mainly on the Cu nanoparticles as evidenced by the energy-dispersive spectrometer elemental mappings and lines scans. The reduction of 4-nitrophenol was used as a model reaction for the prepared catalysts. PdCu/C and AuCu/C showed high activity for this reaction compared to the literature, and the activity could be further increased by the introduction of Pd and Au in an appropriate ratio at the same time. The normalized reaction rate reached 2.005 s −1 mM −1 for the PdAuCu/C-2.0, in which the mole ratio of Pd to Au was 2.0.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
DALTON TRANSACTIONS
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2014
·Vol. 43
·期 26
·10057-10063
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IF 4.097
Xin Yang,Junhai Wang,Dongyue Su,Qingdong Xia,Fang Chai,Chungang Wang,Fengyu Qu
Rapid and sensitive detection of 2,4,6-trinitrotoluene (TNT) and 4-nitrophenol (4-NP) has attracted considerable attention due to their wide applications as nitroaromatic explosive materials. A novel fluorescence method for TNT and 4-NP based on bovine serum albumin functionalized fluorescent gold nanoclusters (BSA Au-NCs) has been developed. The detection probe BSA Au-NCs can be used as a fluorescent probe for the sensitive and selective detection of TNT and 4-NP simultaneously. A good linearity of fluorescence detection using BSA Au-NCs as a fluorescent probe was observed for TNT and 4-NP concentrations in the range of 10−8–5 × 10−5 M and 10−9–5 × 10−5 M, with a detection limit of 10 nM and 1 nM, respectively. The high specificity of TNT and 4-NP with BSA Au-NCs interactions provided excellent selectivity towards detecting TNT and 4-NP over other relevant nitroaromatic compounds. This system can be applied to test strips to detect TNT and 4-NP with high sensitivity and selectivity. The vapour of TNT and 4-NP can be detected using BSA Au-NCs test paper within 1 min with a detection limit of 10 pM and 1 pM.
研究领域:
分析化学
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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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 24
·22284-22296
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IF 2.22
Lv Xuehua,Lan Hai,Guo Jie,Guo Meixian,Yan Ya
AgInS 2 and Au-loaded AgInS 2 (denoted as Au/AgInS 2 ) were prepared by one-pot method with thioacetamide as sulfur source and mercaptoacetic acid as stabilizer. The structure, morphology, and optical properties of the obtained samples were characterized by XRD, XPS, BET, HRTEM, DLS, PL, and UV–vis-DRS. The photocatalytic activities of AgInS 2 and Au/AgInS 2 for the degradation of Rhodamine B (RhB) and 4-Nitrophenol (4-NP) under visible light irradiation were investigated, and the optimal proportions of Au introduced on AgInS 2 for the degradation of RhB and 4-NP were obtained. The possible degradation mechanisms of 4-NP by AgInS 2 and Au/AgInS 2 were proposed based on the active species trapping experiment, optical properties characterization, and the flat potential determination. The results showed that Au was successfully introduced on the surface of AgInS 2 nanoparticles, and the photocatalytic degradation efficiencies of Au/AgInS 2 toward RhB and 4-NP were higher than those of AgInS 2 . 5%Au/AgInS 2 was the optimal proportion for the degradation of RhB, and the degradation efficiency could reach 98% in 30 min, while 7.5%Au/AgInS 2 was the best proportion for the degradation of 4-NP, and the degradation efficiency could reach 100% in 30 min. The enhanced visible light photocatalytic performances of Au/AgInS 2 could be attributed to the stronger visible light absorption and the lower recombination probability of photogenerated electron–hole pairs. Active species trapping experiment suggested that the main active species was superoxide radical (·O 2 − ) for the degradation of RhB by Au/AgInS 2 , while for the degradation of 4-NP, the main active species were superoxide radical (·O 2 − ) and hydroxyl radical (·OH).
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Desalination and Water Treatment
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2025
·
IF 1
An Nang Vu,Ngoc – Hoa T. Le,Thanh- My T. Nguyen,Uyen N. Nguyen-Thai,Kim – Phung L. Nguyen,Lan Duc Vu
We present a straightforward method for creating reusable magnetic Fe 3 O 4 /Ag catalysts. Three distinct Fe 3 O 4 varieties were synthesized using different methods, and Ag nanoparticles were deposited onto the Fe 3 O 4 matrix via a hydrothermal process. The resulting Fe 3 O 4 and Fe 3 O 4 /Ag materials were characterized by XRD, XPS, FT-IR, Raman, DLS, FE-SEM, TEM, EDX, VSM, and UV-Vis spectroscopy. XRD analysis of the Fe 3 O 4 particles synthesized using the solvothermal reduction process (S2) revealed firm diffraction peaks, indicating high crystallinity. After hydrothermal treatment, S2/Ag retained a hollow spherical morphology and magnetic properties similar to Fe 3 O 4 . The synthesized Fe 3 O 4 /Ag catalytic performance was evaluated for the reduction of 4-nitrophenol (4-NP) and methyl orange (MO) dye in the presence of NaBH 4 . All catalysts effectively reduced both dyes and could be magnetically separated from the aqueous solution. The P1/Ag catalyst achieved over 95 % reduction of MO and 4-NP within 2 minutes. S2/Ag exhibited superior stability, preventing Ag leaching during the reaction. Furthermore, its high saturation magnetization allows easy magnetic extraction from the solution. These findings strongly suggest S2/Ag as a promising catalyst due to its selectivity and advantageous properties.
研究领域:
材料科学
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环境化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Libo Sun,Qingtai Xie,Heshun Jing,Jindong Xie,Wenyu Tan,Baorong Duan,Xun Sun,Caixia Qi,Huijuan Su
The development of nanogold catalysts with high activity and high stability is of great significance for their industrial applications. In this paper, Au-PDA@Fe 3 O 4 catalysts were prepared through the gold sol adsorption method. First, micron-sized magnetic Fe 3 O 4 spheres were synthesized via a solvothermal method, serving as the core to endow the catalyst with excellent recyclability. Subsequently, a layer of polydopamine (PDA) shell was polymerized on the magnetic core surface. By controlling the timing of introducing the gold sol containing Au nanoparticles (NPs), the spatial position of Au NPs within the PDA layer was regulated, leading to a series of magnetic core-shell nano gold catalysts with varying spatial positions of Au. Using the 4-nitrophenol (4-NP) hydrogenation as the probe, the influence of Au spatial position, Au size, and other conditions on the catalytic performance was investigated. Results showed that, in the prepared Au-PDA@Fe 3 O 4 -16 catalyst, the Au NPs are encapsulated within the PDA shell and positioned close to the outer layer. This not only provides remarkable stability to the Au NPs but also maintains their proximity to the surface of the PDA shell, allowing easier access of the substrate 4-NP to the Au NPs and conferring good reactivity upon the catalyst. The strong electron metal-support interaction between PDA and Au enables PDA to effectively stabilize Au NPs. The prepared Au-PDA@Fe 3 O 4 -16 catalyst exhibits excellent stability, maintaining a high conversion rate of 91 % even after 14 cycles of use. Our findings not only deepen the understanding of the catalytic mechanisms involved but also pave the path towards the creation of highly efficient and robust gold-based catalysts, facilitating their widespread utilization in industrial applications.
研究领域:
材料科学
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催化化学
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纳米技术
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产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 3
·e4208
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IF 3.581
Yan Gao,Jiasheng Fang,Yiwei Zhang,Chao Zhang,Shuo Zhao,Yuming Zhou,Mengqiu Huang,Xiaoli Sheng
A facile strategy is reported for the fabrication of Pt-loaded core–shell nanocomposite ellipsoids (Fe 2 O 3 -Pt@DSL) consisting of ellipsoidal Fe 2 O 3 cores, double-layered La 2 O 3 shells and deposited Pt nanoparticles (NPs). The formation of the doubled-shelled structure uses Fe 2 O 3 -Pt@mSiO 2 as template sacrificial agent and it involves the re-deposition of silica and self-assembly of metal oxide units. The preparation methods of double-shelled metal oxides avoid repeated coating and etching and could be utilized to fabricate other shaped double-shelled composites. Characterization results indicated that the Fe 2 O 3 -Pt@DSL nanocomposites possessed mesoporous structure and tunable shell thickness. Moreover, due to the formation of Fe 2 O 3 and La 2 O 3 composites, Pt NPs can also be stabilized via deposition on chemically active oxides with a synergistic effect. Therefore, as a catalyst for the reduction of 4-nitrophenol, Fe 2 O 3 -Pt@DSL showed superior catalytic activity and reusability due to structural superiority and enhanced composite synergy. Finally, well-dispersed Pt NPs were encapsulated into the void between the shell layers to construct the Fe 2 O 3 -Pt@DSL-Pt catalyst.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Scientific Reports
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2016
·Vol. 6
·期 1
·1-9
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IF 5.228
Peng Fang,Wang Qi,Shi Rongjia,Wang Zeyi,You Xin,Liu Yuhong,Wang Fenghe,Gao Jay,Mao Chun
A novel and efficient catalyst is one of the goals in the material field, and the involvement of nanoscience and technology has brought new vigor to the development of catalyst. This research aimed to develop a simple two-step route to fabricate Fe 3 O 4 @PS/PDA-Ag hybridnanotubes with size-controllable and highly dispersed silver nanoparticles (NPs). First, Fe 3 O 4 @PS nanotubes of a sound mechanical property were prepared using polystyrene (PS)/toluene solution containing highly dispersed oleic acid modified Fe 3 O 4 particles in a commercial AAO template. Next, the facile technique was used to form in situ silver NPs on the surface of magnetic PS (Fe 3 O 4 @PS) nanotubes through dopamine coating. The catalytic effects of the prepared Fe 3 O 4 @PS/PDA-Ag hybridnanotubes with highly dispersed AgNPs were characterized using a range of analytical methods, including transmission electron microscopy, thermogravimetric analysis, UV-Visible spectroscopy, and X-ray diffraction. It was found that such prepared Fe 3 O 4 @PS/PDA-Ag hybridnanotubes had a large specific surface area. They possessed excellent activities in catalyzing the reduction of 4-nitrophenol (4-NP) by NaBH 4 in the aqueous phase. Furthermore, they were readily separated from fluid and retrieved by an external magnet. Their catalyst activity and recyclability demonstrated that this approach we proposed had the potential to become a new idea and route for catalytic platform.
研究领域:
材料科学
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纳米技术
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催化化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2016
·Vol. 6
·期 67
·62302-62309
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IF 3.289
Ziyang Wu,Haibo Lin,Yunze Wang,Xuemin Yu,Jinglong Li,Zhu Xiong,Yi Wang,Youju Huang,Tao Chen,Fu Liu
Poly(vinylidene fluoride) (PVDF) membranes have been widely applied to treat wastewater, however, the removal of toxic aromatic phenolic compounds remains a technical challenge due to the serious adsorption fouling and difficult degradation. Herein, we aimed to design a superhydrophilic PVDF membrane decorated with Au nanoparticles, which enhanced the rapid degradation of p-nitrophenol (4-NP). The superhydrophilic PVDF membrane with a micro/nano structured surface was decorated with Au nanoparticles via poly(dopamine) (PDA) as a spacer. The influences of membrane affinity (e.g. Hydrophilic Membrane (HM), micro/nano structured superhydrophilic membrane (MSiM), and micro/nano structured superhydrophobic membrane (MSoM)) on PDA deposition and the subsequent Au decoration were comprehensively investigated. The synthesized Au nanoparticles were characterized using transmission electron microscopy (TEM) and UV-vis absorption spectra. The morphology and composition was evaluated using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Static catalytic experiments demonstrated that MSiM degraded over 90% of 4-NP in 5 minutes with a kinetic reaction rate constant of 47.84 × 10−2 min−1 and high stability over 6 cycles. A membrane catalytic reactor (MCR) was designed to realize the continuous catalytic degradation of 4-NP with a kinetic reaction rate constant of 7 × 10−2 min−1.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Chemical Engineering Journal Advances
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2021
·
IF 0
Xiaomiao He,Saishuai Bai,Jizhou Jiang,Wee-Jun Ong,Jiahe Peng,Zhiguo Xiong,Guodong Liao,Jing Zou,Neng Li
Excitonic effects induced via Coulomb interactions and an appropriate interfacial contact of electrode modified materials play crucial roles in transfer/separation of interfacial charge carriers during the electrochemical sensing process. Herein, an oxygen vacancy (V o ) mediated step-scheme (S-scheme) heterojunction of WO 2.9 /g-C 3 N 4 was fabricated by electrostatic self-assembly of high-purity commercial WO 2.9 nanoparticles and ultrathin g-C 3 N 4 nanosheets, where g-C 3 N 4 nanosheets were prepared via polymerization followed ultrasonic-assisted exfoliation. The fabricated V o -S-scheme WO 2.9 /g-C 3 N 4 heterojunction-based sensor exhibited superior electrochemical performance for detecting environmental hormone 4-nitrophenol (4-NP). Due to the introduction of V o , an increased free-charge-carriers, a built-in electric field and a high adsorption energy are generated at the heterojunction interface, which all can significantly improve the sensitivity of this proposed sensor. It also showed good reproducibility, high accuracy, good recovery, and strong feasibility for 4-NP detection in real samples. This work not only conduces significantly to understanding the defective structures and S-scheme heterojunctions, but also provides new insights into designing and constructing novel efficient electrochemical sensors.
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
DOI
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Longlong Geng,Qing Zhang,Xiaoli Wang,Haixiang Han,Yong-Zheng Zhang,Chunhui Li,Zhen Li,Da-Shuai Zhang,Xiuling Zhang,Abdukader Abdukayum,Guangzhi Hu
The development of advanced catalysts is of vital importance for chemical production, and vacancy engineering represents an effective approach to improve the overall catalytical activities by modulating their structural characters. Herein, a series of oxygen-vacancy-functionalized copper oxides were effectively prepared through a hydrothermal-oxidative tandem process. The optimized CuO-S30 catalyst shows an exceptionally-improved catalytical performance for the selective hydrogenation of 4-nitrophenol (4-NP) with good reusability. With the assistance of theoretical simulation, the exceptional activity can be attributed to the electronic modulation induced by oxygen vacancies in CuO-S30, which could not only facilitate the trapping of the reactants on the positively charged Cu sites, but also promote the electron transfer during the hydrogenation process. This study offers a facile and environmentally friendly strategy for electronic property modulation in metal oxides by oxygen vacancies construction, which can be further extended to other advanced catalysts with outstanding catalytic properties.
研究领域:
材料科学
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催化化学
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理论模拟
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Ting Zhou,Luyao Zang,Junjie Sun,Xia Zhang,Zijie Qu,Xia Liu,Guodong Zhang,Xiufeng Wang,Fang Wang,Zhiqing Zhang
Considering the severe hazard to health posed by nitrophenol (NP) isomers, especially 4-NP, reliable and selective detection strategies are urgently challenged. In this study, a fluorescence platform based on glutathione-stabilized gold/silver nanoclusters (GSH-Au/Ag NCs) and zeolite imidazolate framework material (ZIF-8) was developed for 4-NP detection. The synergistic effect of gold and silver makes the bimetallic nanoclusters (GSH-Au/Ag NCs) much better in optical properties than gold nanoclusters. Subsequently, GSH-Au/Ag NCs with aggregation-induced emission (AIE) effect was encapsulated into ZIF-8 to obtain GSH-Au/Ag NCs@ZIF-8 nanocomposite. Compared with GSH-Au NCs, the fluorescence signal was efficiently further improved nearly 7 times through the confinement effect of ZIF-8, and the fluorescence lifetime was increased from 1.2 μs to 6.9 μs. The addition of 4-NP effectively quenched the fluorescence emission peak of GSH-Au/Ag NCs@ZIF-8 at 600 nm, and the assay exhibited highly sensitivity to 4-NP with the detection limit of 1.11 μM from 2.0 μM to 35 μM. Especially, results showed that 4-NP could be easily discriminated from nitrophenol isomers (3-NP and 2-NP). The mechanism research demonstrated that the absorption curve of GSH-Au/Ag NCs@ZIF-8 + 4-NP overlapped greatly with the fluorescence excitation spectrum of GSH-Au/Ag NCs@ZIF-8, and the fluorescence lifetime of GSH-Au/Ag NCs@ZIF-8 did not change when 4-NP was present or not. Therefore, the mechanism of GSH-Au/Ag NCs@ZIF-8 for 4-NP detection was mainly attributed to the inner filter effect (IFE). Furthermore, the developed detection assay was applied to water sample with satisfactory recovery results, demonstrating its high potential in monitoring 4-NP in environment.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Xinyu Guo,Chuchu Chen,Huan Jiao,Wenjuan Wu,Yongcan Jin,Zhiqiang Liang,Bo Jiang
Lignin-based carbon materials constructed by additive manufacturing are at the forefront for energy and environment research due to the abundant carbon element, low-cost, and sustainable features of lignin. Yet the uncontrollable rheological behavior and rigid structure often lead to lignin being used as an additive and the amount is very low, impeding its efficient application. Herein, we developed a low-cost direct ink writing strategy to fabricate 3D scaffolds with high lignin content (over 80 %). The printed filaments display excellent self-supporting capacity and keep intact even subjected to carbonization. As a proof of concept, the branches-leaves-inspired Pd/TiO 2 hierarchical photocatalyst was further decorated on the carbonized scaffolds for efficient catalytic reduction of 4-nitrophenol. Combined the controllable macro- and micro-structure of the scaffolds, the high light harvesting ability and specific surface area of Pd/TiO 2 hierarchical structure, the carbon-based catalyst demonstrates outstanding photocatalytic reduction activity to 4-nitrophenol, with the turnover frequency value up to 8.73 min −1 , much higher than most other carbon-based catalysts. The developed carbon-based hierarchical photocatalyst also shows good catalytic stability and reusability. This facile and scalable high content lignin 3D printing technique opens a new avenue to fabricate lignin-based carbon materials for widespread applications.
研究领域:
材料科学
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环境科学
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化学工程
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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）