RSC Advances
·
2021
·Vol. 11
·期 63
·39797-39803
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IF 3.361
Rong Wang,Hongyan cao
In this paper, a simple and cost-efficient strategy was used to construct a uniform Au NPs distribution on the surface of flexible filter paper for the detection of benzidine. Taking full advantage of the adsorption properties of filter paper, small gold nanoparticles were adsorbed onto its surface as gold seeds, and subsequently grown by electroless plating to form a highly uniform distribution of Au NPs substrates. By changing the electroless plating time, an optimal substrate was obtained. The as-prepared substrate exhibited satisfactory sensitivity with a low detection limit of 10−13 M for 4-ATP, and good reproducibility and homogeneity. Furthermore, the as-prepared substrates were successfully used for the detection of benzidine in environmental water, with a minimum detection concentration as low as 0.1 ppm and recoveries in the range of 92.4 to ∼108.5%. This study indicated that filter paper-based SERS substrates have great potential value in the detection of environmental organic pollutants.
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Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 1
·174-183
·
IF 11.9
Chan Li,Ke Yang,Zelin Ma,Fei Zhao,Juan Li,Xinwu Xu,Xiaoyu Hao,Haoyuan Qi,Yibo He
The kinetic behaviors of polysulfides related to sluggish/incomplete conversion and repeated shuttles are the key factors behind the unsatisfactory performance of Li–S batteries. Herein, an Au-decorated covalent organic framework/graphene (Au–COF/rGO) is employed to construct a multifunctional interface to solve such issues. The narrow porous structure of COF can confine the diffused polysulfides via a physical barrier, and Au can further anchor and facilitate the catalytic conversion of intercepted polysulfides. Meanwhile, the well-conducting rGO nanosheets are also able to act as an upper current collector to activate polysulfides to quickly participate in the next electrochemical reaction. Thus, an orderly connection between the confinement–capture–conversion of polysulfides is formed. Additionally, the good lithium affinity of Au and imine linkages on COF can promote Li+ diffusion, achieving a fast charge of batteries. Attributed to the multi merits of the Au–COF/rGO interface, the assembled Li–S batteries not only deliver an ultra-high specific capacity (1525 mA h g−1 at 0.1C) with a prominent rate performance (568 mA h g−1 at 4C), but also exhibit outstanding cycling performance in both the cases of conventional and high sulfur loadings. The rational design of the Au–COF/rGO interface provides a new insight into developing advanced Li–S batteries.
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FUEL
·
2023
·
IF 7.4
Yaping Liu,Chao Pan,Xiaomin Qiu,Xianjie Li,Hengjun Gai,Meng Xiao,Tingting Huang,Quanhong Zhu,Hongbing Song
Although fossil fuels bring convenience to the production and life of people, they also cause numerous environmental problems. As a result of overexploitation, fossil fuels are gradually being depleted as a nonrenewable resource. Biomass is a green and renewable resource and has attracted people’s attention. As a platform compound derived from renewable biomass, 5-hydroxymethylfurfural (HMF) is important for in-depth research. The oxidative esterification process from HMF to dimethyl furan-2,5-dicarboxylate (FDMC) was achieved using a gold (Au) nanoparticle (NP) catalyst supported on poly(ionic liquid)s (PILs). The comprehensive characterization of the synthesized catalyst showed that the Au NPs were successfully loaded on PILs, and a strong interaction occurred between the catalyst support and the metal. In this work, 10 %Au/PILs-Cl-1 was used as the best catalyst. The conversion of HMF ( C HMF ) and the selectivity to FDMC ( S FDMC ) reached 95.08 % and 96.82 %, respectively, under the conditions of 120 °C, 1.5 MPa, 12 h, and 0.5 equiv. CH 3 ONa. In addition, cycling experiments indicated the stability and successfully recycling of 10 %Au/PILs-Cl-1 catalyst.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jin Wang,Zhongyan Gong,Yulong Zhang,Yaxin Song,Xinya Chen,Zhihao Lu,Lu Jiang,Chengcheng Zhu,Kun Gao,Kaili Wang,Junjie Wang,Liuyingzi Yu,Soukaina Khayour,Haijiao Xie,Zhuoyao Li,Gang Lu
Electrocatalytic hydrogen evolution reaction (HER) is receiving increasing attention as an effective process to produce clean energy. The commonly used precious metal catalysts can be hybridized with semiconductors to form heterostructures for the improvement of catalytic efficiency and reduction of cost. It will be promising to further improve the efficiency of heterostructure-based nanocatalysts in electrocatalytic and photocatalytic HER using a simple and effective method. Herein, we improve the efficiency of Au/TiO2 in electrocatalytic and photo-electrocatalytic HER by selectively adsorbing p-aminothiophenol (PATP) molecules. The PATP molecules are adsorbed on the gold surface by using a simple solution-based method and favor the charge separation at the Au–TiO2 interface. We also compare the PATP molecules with other thiophenol molecules in the enhancement of electrocatalytic HER. The PATP-induced enhancement in electrocatalysis is then further investigated by density functional theory (DFT) calculations, and this enhancement is attributed to a reduction in Gibbs energy of adsorbed hydrogen after surface adsorption of PATP molecules. This work provides a simple, cost-effective, and highly efficient approach to improve the electrocatalytic and photo-electrocatalytic efficiency of Au/TiO2, and this approach could be easily extended to other heterostructure-based nanocatalysts for performance enhancement and may be used in many other catalytic reactions.
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 11
·1-10
·
IF 2.8
Peng Lin-Ling,Zhou Wei-Fang,Chen Min,Li Li-Jun,Liu Yu,Zhou Cong-Shan,Xie Jun,Tang Ke-Wen
A novel disulfide functionalized nitrogen-rich covalent organic polymer (S-COP) directly synthesized by a solvothermal method were characterized by XRD, SEM, FT-IR, N 2 adsorption–desorption and XPS techniques. The as-synthesized polymer shows efficient adsorption performance for Au(III) from aqueous solution. The adsorption equilibrium of the adsorbent could be achieved within 5 h, and the as-synthesized S-COP exhibits an exceedingly high Au(III) uptake capacity of 1506 mg·g −1 . Furthermore, S-COP has satisfactory selectivity and reusability, which is a highlight of adsorption materials.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Lu Ji,Fang Li,Conghui Che,Wei Xue,Qiusheng Yang,Xiaoshu Ding,Dongsheng Zhang,Xinqiang Zhao,Yanji Wang
In the reaction of dimethyl carbonate (DMC) and 2,4-diaminotoluene (TDA), Au/CeO 2 exhibits higher selectivity than CeO 2 for dimethyl toluene-2,4-dicarbamate (TDC). However, its catalytic activity drops after H 2 reduction (denoted as Au/CeO 2 -R). The characterization results illustrate that Au exists as a single atom with the primary species as Au δ+ in Au/CeO 2 , forming Ce x Au 1−x O 2 structure similar to solid solution. Whereas for Au/CeO 2 -R catalyst, Au mainly exists as Au 0 , forming the Au-O-Ce structure on CeO 2 surface. Significantly, the strong interaction between Au and CeO 2 increases Ce 3+ and oxygen vacancies content, as well as modulates their acidic property. However, the catalytic activity of Au/CeO 2 -R is found to be lower than Au/CeO 2 as the species formed by DMC dissociation on its surface are not easily desorbed. Other transition metals supported on CeO 2 are also prepared, wherein Pt/CeO 2 and Pd/CeO 2 exhibit good TDC selectivity. In the end, the electronegativity and catalytic activity of metals are correlated.
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SENSORS AND ACTUATORS A-PHYSICAL
·
2023
·
IF 4.6
Ruizhen Li,Wanzhen Yuan,Yu Hu,Yonggang Zeng
Propranolol , a widely used β-adrenergic receptor antagonist drug with potential toxic effects to organisms and human beings, was not completely removed from environment through traditional wastewater treatments . It is necessary to sensitively and selectively monitor the trace content propranolol in various samples. In this work, a novel photoelectrochemical (PEC) aptasensor based on Au nanoparticles (NPs) modified g-C 3 N 4 /BiPO 4 heterojunction was successfully fabricated for detecting (S)-propranolol (S-Pro), an important racemic enantiomer of propranolol. Herein, g-C 3 N 4 was employed as visible light-active semiconductor. The photocatalytic activity of g-C 3 N 4 was enhanced via forming heterojunction with BiPO 4 to facilitate the separation and migration of photogenerated carriers . In addition, Au NPs with perfect conductivity and surface plasmon resonance (SPR) effect are not only beneficial to the electron transfer and visible light harvest of g-C 3 N 4 /BiPO 4 heterojunction, but also the crucial factor on assembling S-Pro-binding DNA aptamer via Au-S bonding. At the same time, as a π-π conjugated material, g-C 3 N 4 with large surface area also provides an excellent platform for loading Au NPs. Under the visible light illumination, the PEC aptasensor displayed high PEC performance. On such a sensor, specific captured S-Pro by the aptamer was quickly oxidized by the photogenerated holes to inhibit the recombination of the photogenerated carriers, enhanced the PEC response, and realized the detection of S-Pro. Under optimal conditions, the designed PEC aptasensor exhibited a wide linear range of 10 nM to 1000 nM with a low detection limit (defined as S/N = 3) of 2.55 nM. Moreover, the proposed sensor displayed high selectivity , good reproducibility, and general long-term stability. And the S-Pro in real sample was accurately detected using this proposed sensor.
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Molecular Catalysis
·
2023
·
IF 4.6
Cong Wan,Shuangshuang Cen,Xinyan Chai,Feifei Tao,Lei Li,Xiandong Yao,Huiquan Xiao,Lijun Wang
Au nanoparticles with an average diameter of 3.7 nm supported on the macroporous anion exchange resin beads with cationic –CH 2 N + Me 3 functional groups and OH − as counter anions were first prepared, for catalyzing the oxidative esterification of biomass-derived furfural in methanol using green O 2 as an oxidant. The main product methyl furoate with a high yield of 98% was obtained at 130 °C for 2 h in the absence of soluble alkali additives. The catalyst beads possessed a particle size range of 560∼700 μm inherited from the shaped support, enabling the separation of catalyst and liquid reaction medium by a simple decantation method. Catalyst poisoning experiments demonstrated Au activated superoxide radical O 2 · − and the basic OH − stored in the anion exchange resin are the decisive active components for the oxidative esterification, and the main product methyl furoate with a yield of 20% and a high selectivity of 96% was obtained under N 2 atmosphere revealed the reaction in this catalytic system followed an oxidative dehydrogenation route. In all catalytic cases except for the catalyst poisoning experiments and the cases of low catalyst dosages, the by-product acetal was almost completely suppressed, probably attributed to the presence of the alkaline OH − in the anion exchange resin of the catalyst.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Nian Li,Zi-jian He,Jia-hui Zhao,Zhi-dong Zhao,Xing-rui Qi,Hao-dong Wang,Bo Liu,Hua-jie Lai,Tao Jin
Developing magnetic adsorbent that combines the merits of quick response, excellent enrichment capacity, uniform and stable dispersivity is of paramount importance in pollutants pretreatment. In this work, tunable strawberry-like Fe 3 O 4 @SiO 2 -NH 2 @Au@ 2-ME magnetic solid phase extraction materials were prepared via assembly method. The obtained nanocomposites were characterized using scanning electron microscopy, X-ray diffraction spectroscopy, infrared spectroscopy , X-ray photoelectron spectroscopy, and whereafter the preparation method was optimized. Integrating magnetic solid-phase extraction with high-performance liquid chromatography and fluorescence detection , a comprehensive enrichment and detection method toward bisphenol A (BPA) was well established. This method demonstrated high efficiency and rapidity, achieving rapid enrichment of BPA. The as-developed method exhibited good linear correlation within the range of 10.0–500 μg·L −1 , with a recovery of 85–92%. It showed excellent sensitivity and reproducibility in BPA extraction with low limit of detection (LOD, 0.274 μg·L −1 ), limit of quantitation (LOQ, 0.913 μg·L −1 ) and relative standard deviation (RSD, 1.5%, n = 6), respectively. The proposed Fe 3 O 4 @SiO 2 -NH 2 @Au nanoplatform firmly supports the envision that proper surface functionalization of magnetic substrate could promote the enrichment capacity toward various pollutants in actual application scenarios.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Songcai Cai,Jing Chen,Qiang Li,Hongpeng Jia
CO2 conversion into chemical fuels is a sustainable approach to the concurrent mitigation of the energy crisis and the greenhouse effect. It is still urgently desirable but quite challenging to explore a promising catalyst for CO2 photoreduction due to the severity in the fast recombination of electron holes and the deficiency of active sites, which have a tremendous influence on the catalytic behavior. In this regard, mesoporous TiO2 nanospheres containing oxygen vacancies (OVs) and metallic Au nanoparticles (NPs) were successfully prepared and showed markedly enhanced CO2 reduction activity and CH4 selectivity by the simple combination of photocatalysis with the simultaneous photothermal effect under full-spectrum irradiation. The dual introduction of OVs and a Au/TiO2 Schottky junction can not only serve as an electron sink to significantly improve the charge separation/transfer efficiency but also show effective photothermal conversion to raise the local temperature of the catalyst, thus resulting in an enhanced shuttle of electrons and desorption of products. This study not only offers new insights into the integrated tuning of charge recombination processes but also demonstrates that the photothermocatalysis has great potential in CO2 reduction.
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ELECTROANALYSIS
·
2021
·Vol. 33
·期 7
·1810-1818
·
IF 3.223
Weijia Xu,Tao Liu,Yiqing Wang,Wei Zhang,Xiaoyue Yao,Bailing Hou,Ying Xie,Zhenyu Chu,Wanqin Jin
Cardiac Troponin I (cTnI) is a preferred biomarker to diagnose acute myocardial infarction which is one of the leading risks to health globally due to its short term. However, clinical analyzers are difficult to achieve its on-site quantitative detection. A novel label-free aptasensor was constructed to realize ultrasensitive and rapid recognition of cTnI. A nanocubic AuNPs/In 2 O 3 composite was designed to provide synergistic effects of abundant active sites and signal magnification for aptamers grafting. Relying on a conductance-dependence strategy, this aptasensor can achieve the quantitative detection within 10 min, which is much faster than state-of-the-art analyzers, as well as exhibiting an ultrawide linear range of 0.1–1000 ng/mL and a low detection limit of 0.06 ng/mL with an excellent selectivity in the analysis of human serum.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2021
·Vol. 2021
·期 24
·2353-2364
·
IF 2.524
Xuerui Cao,Guangwei Cao,Mei Li,Xinli Zhu,Jinyu Han,Qingfeng Ge,Hua Wang
Graphical Novel Au x Cu 2 O electrocatalysts were synthesized via the galvanic replacement reaction between Cu 2 O nanocubes and HAuCl 4 solution, and the pre-reduction by linear voltammetry (LSV). The Au 0.02 Cu 2 O pre-reduced by LSV significantly boosted C 2 H 4 selectivity in CO 2 electrocatalytic reduction, which were 5 and 2 times higher than those of bare Cu 2 O and Au 0.02 Cu 2 O pre-reduced by chronoamperometry at high potential, respectively. Electrochemical reduction of carbon dioxide to fuels has been recognized as a perspective way to address the environmental and energy issues. Herein, the novel Au decorated Cu 2 O electrocatalysts were synthesized via the galvanic replacement reaction and the successive pre-reduction by linear voltammetry (LSV) method. In contrast to Cu 2 O, CO formation became dominant over HCOOH and H 2 on Au x Cu 2 O, and a remarkably enhanced selectivity of C 2 H 4 was obtained beyond −1.1 V vs. RHE. Among them, Au 0.02 Cu 2 O exhibited the highest Faraday efficiency (FE) of C 2 H 4 of 24.4 % at −1.3 V vs. RHE, which was as high as 2∼2.5 and 5 times of those on other two Au x Cu 2 O and bare Cu 2 O, respectively. Meanwhile, it is demonstrated that the optimal ratio of Au/Cu was essential for effective sequential catalysis between Au and Cu 2 O to enhance C−C coupling. Furthermore, the effect of copper states resulting from different pre-reduction methods on the selectivity of C 2 H 4 was explored. A half decrease of C 2 H 4 FE was observed on HPR-Au 0.02 Cu 2 O (high potential reduced) relative to the LSV reduced Au 0.02 Cu 2 O, which was ascribed to the different content of Cu 0 and residual Cu + in two catalysts. Our results demonstrate an effective approach to construct Cu 2 O based bimetallic catalysts for ethylene formation from CO 2 .
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