APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yibin Bu,Yafeng Chen,Guiming Jiang,Xinmei Hou,Shun Li,Zuotai Zhang
To design an efficient catalyst for HCHO oxidation, it requires good understanding of the correlation between structural properties of catalyst and the reaction mechanism. We investigated performance of commercial CeO 2 (CeO 2 -C) and nanorod CeO 2 (CeO 2 -R) and the corresponding Au/CeO 2 catalysts in HCHO oxidation. Reactivity tests showed that Au/CeO 2 -R is highly efficient and stable in HCHO oxidation at room temperature, which is attributed to the highly active Au-CeO 2 -R interface. The strong interaction between Au and CeO 2 -R greatly promotes the creation of oxygen vacancies and Au 3+ near the interface, which promotes the formation of formate. The conversion of formate can follow both a decomposition and a direct oxidation pathway, which is remarkably enhanced by the coexistence of Au 3+ and oxygen vacancies. In addition, formate accumulation and Au particles aggregation led to deactivation. The presence of humidity promotes the oxidation of formate, which improves the reactivity and stability of Au/CeO 2 in HCHO oxidation.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Pingping Wu,Lei Song,Yue Wang,Xuehua Liu,Zhengke He,Peng Bai,Zifeng Yan
Achieving the balance between the catalytic activity and product selectivity still remains a challenge in partial oxidation processes, because the products are prone to be over-oxidized. Lewis acids (such as AlCl 3 ) have previously been identified to interact with C O groups, which can prevent the ketone products from further transformation. In this work, ZrO 2 promoted Au-Pd/γ-Al 2 O 3 catalyst was designed to enhance the benzaldehyde selectivity by generating more surface Lewis acid site on ZrO 2 -modified alumina. Results show that the introduction of ZrO 2 (5%) resulted in the formation of more surface Lewis acid sites, which improved the benzaldehyde selectivity through the strengthened interaction between the Lewis acid sites and C O groups in benzaldehyde. Besides, the addition of small amount of ZrO 2 enhanced the noble metal dispersion and led to the formation of more active sites to improve the oxygen transfer during the reaction.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-10
·
IF 6.232
Zou Lina,Yang Lingxi,Zhan Yi,Huang Di,Ye Baoxian
A photoelectrochemical platform for thrombin determination was developed based on Au-rGO-CuS as multiple signal amplification elements. CuInS 2 QDs was used to sensitize burr-shape TiO 2 (b-TiO 2 ) to obtain a strong photocurrent. Under the specific recognition between aptamer and thrombin, a sandwichlike structure was formed and the Au-rGO-CuS-labeled aptamer (S2@Au-rGO-CuS) was immobilized on the electrode surface. This induced a sharp decrease in photocurrent. The phenomenon is mainly due to the fact that CuS NPs can competitively consume the light energy and electron donor with CuInS 2 /b-TiO 2 . The rGO can increase the amount of CuS NPs and the Au NPs can accelerate charge transferring which depress the recombination of photogenerated electrons and holes in CuS to further enhance the competitive capacity of CuS. The sandwichlike structure has a steric hindrance effect. Therefore, the S2@Au-rGO-CuS has a multiple signal amplification function for thrombin determination. Under optimal conditions, the PEC aptasensor exhibited a wide linear concentration range from 0.1 pM to 10 nM with a low detection limit of 30 fM (S/ N = 3) for thrombin. Besides, the designed aptasensor performed well in the assay of human serum sample, indicating good potential for the determination of thrombin in real samples.
Graphical abstract
研究领域:
生物化学
·
分析化学
·
医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science Bulletin
·
2020
·
IF 9.511
Dong-Rui Yang,Ling Liu,Qian Zhang,Yi Shi,Yue Zhou,Chungen Liu,Feng-Bin Wang,Xing-Hua Xia
Electrochemical conversion of CO 2 into fuels is a promising means to solve greenhouse effect and recycle chemical energy. However, the CO 2 reduction reaction (CO 2 RR) is limited by the high overpotential, slow kinetics and the accompanied side reaction of hydrogen evolution reaction. Au nanocatalysts exhibit high activity and selectivity toward the reduction of CO 2 into CO. Here, we explore the Faradaic efficiency (FE) of CO 2 RR catalyzed by 50 nm gold colloid and trisoctahedron. It is found that the maximum FE for CO formation on Au trisoctahedron reaches 88.80% at −0.6 V, which is 1.5 times as high as that on Au colloids (59.04% at −0.7 V). The particle-size effect of Au trisoctahedron has also been investigated, showing that the FE for CO decreases almost linearly to 62.13% when the particle diameter increases to 100 nm. The X-ray diffraction characterizations together with the computational hydrogen electrode (CHE) analyses reveal that the (2 2 1) facets on Au trisoctahedron are more feasible than the (1 1 1) facets on Au colloids in stabilizing the critical intermediate COOH*, which are responsible for the higher FE and lower overpotential observed on Au trisoctahedron.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Si-Ting Liu,Jia-Yi Zhang,Yu Zhou,Zhen-Long Dou,Cong-Cong Zhang,Si-Jing Ding,Qu-Quan Wang,Li Zhou
This paper presents a mechanistic study on the synthesis of Janus Mn:Ag2Se-Au heterogeneous nanostructures based on a step-by-step protocol. The extinction spectra and morphological observations exhibit interrelated data that elucidate the initial formation and subsequent evolution of growing Mn-doped Ag2Se domains onto Au nanoparticles. The size and morphology of the Mn:Ag2Se-Au can be adjusted by changing the amount of AgNO3. In addition, excessive Se source will generate a sparse Se shell around the Janus Mn:Ag2Se-Au. The characteristic plasmon resonance and photoluminescence attributes of Janus Mn:Ag2Se-Au render it a promising candidate for applications in the fields of sensing and imaging.
研究领域:
材料科学
·
纳米技术
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Wei Liu,Weilong Liao,Yang Ning,Xianming Zheng,Yu Ji,Zhao Dai,Zhaohui Meng,Jingwen Zhang,Junfu Wei,Huan Zhang
In this study, a novel and well-constructed composite fiber membrane (Au/mPVB) is provided for removing the low-concentration formaldehyde gas continuously released in indoor environments at room temperature. The Au/mPVB provides a microreactor-like structure for catalytic reaction , in which the fiber has a homogeneous macroporous structure, and Au NPs are uniformly loaded onto the inner wall of the macropores in the amino-modified fiber (mPVB) by template sacrifice. Formaldehyde can be enriched in the mPVB fiber under the adsorption to the amino groups, and the catalytic performance can be improved effectively under the synergistic effect of adsorption and catalysis. In the experimental results of performance tests, 1 wt% Au/mPVB exhibited a high removal efficiency of 97.5% for 0.8 ppm formaldehyde in the indoor environment, which improved the performance by 25% compared to mPVB, and no obvious decrease of catalytic activation occurred after the continuous formaldehyde-releasing experiment without catalyst regeneration.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Min Liu,Junzi Huang,Huihui Xie,Salman Riaz,Wenbo Fan,Weitao Han,Liang Li,Peng Wei,Yahong Xie,Ying Qi
In this work, we designed the plasmonic photocatalyst of Au–BiOCOOH through a one-pot method, which can be used to effectively treat wastewater contaminated with rhodamine (RhB) and tetracycline (TC). Compared with neat BiOCOOH, as expected, the resulting Au–BiOCOOH illustrated significantly boosted photocatalytic efficiency for degrading RhB and TC under visible light illumination. Remarkably, 3.0%Au–Bi showed the most optimal performance against RhB and TC, achieving degradation rates of 99.5 % and 99.7 % within 120 min. Through multiple characterization techniques, the physical and chemical photoelectric properties of the photocatalyst as well as the photocatalysis mechanism were discussed in detail. UV–visible diffuse reflectance spectroscopy (DRS) analysis demonstrates that the loading of Au nanoparticles (Au NPs) onto 2D nanosheets of BiOCOOH significantly expanded the wavelength range of response of BiOCOOH to visible light. Separately, the outcomes of electrochemical impedance spectroscopy (EIS) and photoluminescence (PL) manifestly reveal that the presence of Au NPs on BiOCOOH can efficiently reduce the interfacial charge transfer resistance and accelerate the photogenerated charge transfer. The free radical trapping test provided evidence for the essential role played by holes (h + ) and superoxide radicals (·O 2 − ) were involved in the degradation of RhB. The study provided a possibility to improve the photocatalytic efficiency of BiOCOOH.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·
IF 6.7
Xin Huang,Haitao Li,Bin Zhang,Yin Zhang,Hao Wang,Lijun Ban,Yixuan Xu,Yongxiang Zhao
It has been widely recognized that adjusting the size of Au particles has emerged as a significant approach in catalyst design, catalyst screening, and comprehension of reaction mechanisms. However, the essential factors of Au nanoparticles used only as an additive to enhance the activity of traditional multicomponent thermocatalysts have not been fully revealed. In this study, a series of Au@Cu2O core–shell nanocatalysts were synthesized through a controllable method, featuring core sizes ranging from 11 to 33 nm and an average shell thickness of approximately 55 nm. It was revealed that the size effect of Au cores plays a very vital role in the stability of the active Cu+ species under reducing atmospheres (H2, acetylene and formaldehyde) as well as the catalytic performance of the catalysts in the ethynylation of formaldehyde. The experimental findings revealed that Au@Cu2O core–shell catalysts with Au core sizes ranging from 11 to 16 nm exhibited a higher abundance of electron-deficient Cu+ species in the shell, which is attributed to the strong long-range electromagnetic effects of the Au core in the absence of photoexcitation or an applied electric field. Additionally, the active Cu+ species demonstrated remarkable stability under reducing atmospheres. Although the stability of Cu+ decreased slightly when the Au core size exceeded 16 nm, the Cu+ content remained above 80%. Notably, the Au@Cu2O catalysts with Au core sizes ranging from 11 to 16 nm exhibited excellent catalytic activity in the ethynylation of formaldehyde.
研究领域:
催化化学
·
材料科学
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 71
·41561-41568
·
IF 3.049
Cuifeng Jiang,Xiaoxiu Wei,Shuai Bao,Huajian Tu,Wei Wang
Nanomaterial-based artificial peroxidase has attracted extensive interests due to their distinct advantages over natural counterpart. Cu@Au/Pt and Cu@Ag/Pt nanocomposite with rambutan-like structure were prepared and discovered to function like peroxidase, which was illustrated by catalyzing the oxidation reaction of 3,3′,5,5′-tetramethylbenzidine (TMB) accompanied with a blue color change. Steady-state investigation indicates that the catalytic kinetics of Cu@Au/Pt and Cu@Ag/Pt all followed typical Michaelis–Menten behaviors and Cu@Au/Pt showed a strong affinity for H2O2, while Cu@Ag/Pt showed strong affinity for TMB. The color change and absorbance intensity strongly depend on the concentration of H2O2, thus the direct determination of H2O2 and indirect detection of glucose were demonstrated using Cu@Au/Pt with a detection limit of 1.5 μM and 6 μM, respectively. What is more important, the method was applied for detection of glucose in 50% fetal bovine serum with a detection limit of 80 μM, which is much lower than the lowest glucose content in blood for diabetes (7 mM). Moreover, the Cu@Au/Pt nanocomposite were also successfully applied for sensing L-cysteine because of the inhibition effect. Considering the good peroxidase-like activity and novel structure, Cu@Au(Ag)/Pt is expected to have a wide range of applications in bioassays and biocatalysis.
研究领域:
生物化学
·
纳米医学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
npj Clean Water
·
2025
·Vol. 8
·期 1
·1-12
·
IF 11.4
Zhu Yujiao,Yeung Pui Hong,Lo Tsz Wing,Chai Yao,Wong Yat Lam,Chen Ying,Yang Huaming,Yu Weixing,Zayats Anatoly V.,Xie Fengjia,Zhang Xuming
Photocatalytic water purification is an environmentally sustainable approach, but limited by low efficiency due to challenges with photocatalysts and mass transfer. Optofluidic microreactors can address these constraints, yet optimizing reactor configurations and photocatalyst designs remains challenging. Here, we present a novel planar packed-bed optofluidic microreactor (PPOM) using titanium dioxide nanoflowers (TNFs) decorated with gold nanoparticles (Au/TNFs) and conduct a pilot study on efficient visible light-driven water purification. Compared to TNFs in slurry-mode, the Au/TNFs achieve 46-fold enhancement in photodegradation efficiency due to the plasmonic effect, further boosted to 2,700-fold enhancement in the PPOM configuration by improving surface area, light harvesting, and mass transfer. The PPOM also shows a 7-fold efficiency increase compared to planar film-mode microreactors. Theoretical analysis elucidates the influences of plasmonic effect and reactor configuration on the enhanced photocatalytic activity, emphasizing the potential of integrated optofluidic systems and plasmonic-semiconductor heterostructures for sustainable water treatment and energy applications.
研究领域:
环境科学
·
纳米技术
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Hailun Zhao,Chao Wang,Weilin Zhong,Suqing Peng,Riyang Shu,Zhipeng Tian,Ying Chen
Probing the effect of spatial morphology of catalyst on its photothermal catalytic performance is crucial for solar-driven renewable catalytic reforming of hydrogen production . In this study, Au nanoparticles loaded on various morphologies of TiO 2 nanoparticles were synthesized and characterized. The experimental results indicated that decorating TiO 2 with Au nanoparticles could dramatically increase its photocatalytic activities by 20–40 times. The photothermal conversion efficiency of Au/TiO 2 (12.74%–25.54%) was higher than those of TiO 2 due to the introduction of LSPR of Au nanoparticles could effectively improve the utilization of solar spectrum. Titania nanoflower (TNF) nanoparticles with high light absorption capacity , better colloidal dispersion stability , porous properties and narrow band gap represented the highest H 2 productivity (144.13 μmol·g −1 ·h −1 ). The coarse surface structure was also conducive to the dispersion of gold particles on the surface of the carrier and the growth rate of Au/TNF hydrogen production (40 times) which was higher than that of other morphology within 2 h. The results of glycerol photothermal hydrogen generation highlighted the effect of temperature on colloidal dispersion stability and hydrogen production capability of nanoparticle suspension. It demonstrated that the photothermal effect aroused a temperature rise that would deteriorate the dispersion stability of the suspension although a local entropy increase in the catalyst nanoparticles might occur. At the same time, the temperature rise caused by the photothermal effect efficiently produces hydrogen in the reaction temperature range. Therefore, an ideal temperature setting for maximal hydrogen generation could be validated and improved the photothermal synergistic impact on biomass-reformed hydrogen generation.
研究领域:
化学工程
·
材料科学
·
可再生能源
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 41
·29061-29069
·
IF 3.9
Xixi Wu,Huazhen Liang,Chaoming Li,Duanyang Zhou,Rui Liu
The specific tumor microenvironment is a conducive breeding ground for malignant tumors, favoring their survival, rapid proliferation, and metastasis, which is also an inevitable obstacle to tumor treatment, particularly for catalytic therapy. To address this issue, a hyperthermia-enhanced nanocatalyst (AuP@MnO2) consisting of an asymmetric Au@polypyrrole core and a MnO2 shell is constructed for synergistic cancer Fenton/photothermal therapy. In an ultra-short reaction time (15 min), the innovative introduction of a new oxidizer, tetrachloroauric acid trihydrate, not only successfully initiates the oxidative polymerization of pyrrole monomer while reducing itself to cubic Au, but also accelerates the polymerization process by supplying protic acid. After MnO2 coating, AuP@MnO2 catalyzes the conversion of antioxidant GSH and excess H2O2 into GSSG and ˙OH through Mn2+/Mn4+ ion couples, leading to oxidative damage of tumor cells. More importantly, after 1064 nm laser irradiation, more extreme oxidative imbalance and cell death are demonstrated in this work under the combined effect of photothermal and catalytic therapy, with insignificant toxicity to normal cells. This work develops an efficient one-step synthesis method of asymmetric Au@polypyrrole and provides constructive insight into its oxidative stress-based antitumor treatment.
研究领域:
纳米医学
·
肿瘤治疗
·
催化医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）