CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qiang Huang,Jiayu Yang,Fei Qi,Wenxia Zhang,Nan Zhang,Zhiyu Liang,Jiaxin Liu,Changqing Tian,Xiaosheng Tang,Daofu Wu,Benjun Huo
Photocatalytic conversion of CO 2 to value-added chemicals and fuels is a green and sustainable approach to solve the problems of CO 2 concentration increment and fossil fuels shortage. Employing photocatalysts with high catalytic activity and selectivity to realize CO 2 conversion has attracted extensive attention. However, the efficiency of photocatalysts is still unsatisfied and the selectivity of products is hard to be regulated, hindering their practical applications in large scale commercial purpose. In this work, for the first time, the Au and Pt was co-deposited on the heterostructure consisted of Cu 2 O quantum dots and ReS 2 nanosheets to achieve high efficiency and controllable selectivity during CO 2 photoreduction. The Au-Pt/Cu 2 O/ReS 2 photocatalysts show superior efficiency of CO 2 reduction than that of Au/Cu 2 O/ReS 2 , Pt/Cu 2 O/ReS 2 , Cu 2 O/ReS 2 , Cu 2 O. Such distinct improvement is attributed to the indirect Z-scheme mechanism and Schottky junction effect. Moreover, the synergetic effect of Au and Pt plays an important role of improving the photocatalytic activity, and the Au1-Pt5/Cu 2 O/ReS 2 exhibits the highest R electron of 516.86 μmol/g during one hour of visible light illumination, which is much larger than many recently reported photocatalysts under comparable condition. Meanwhile, the selectivity of CO and CH 4 is effortlessly tunable from 0 to 100% by modulating Au/Pt metal mass ratio due to the strong CO adsorption on Pt metals and the intensive interaction between Au and Pt atoms at the Au/Pt interface. This controllable selectivity provides admirable strategy to tune the component proportion of the gas products for the subsequent conversion into high value-added chemicals or liquid fuels. Our study proposes novel and deep insights into the design and fabrication of practical photocatalysts with high catalytic activity and controllable selectivity to perform efficient CO 2 photoconversion.
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2020
·Vol. 146
·期 3
·956-963
·
IF 3.978
Jun Ma,Gege Feng,Ying Ying,Yong Shao,Yongxin She,Lufei Zheng,A. M. Abd EI-Aty,Jing Wang
Herein, an indirect SERS sensing assay was developed for the determination of glyphosate (Gly) in tap water. The mechanism of detection was based on relieving the inhibitory effect of L-cysteine (L-cys) on a Au–Pt nanozyme by combining Gly with L-cys through divalent copper ions (Cu2+). In this method, a novel nano-chain-like Au–Ag composite with good repeatability was successfully fabricated to detect SERS signals of oxTMB without disturbing TMB Raman signals. Under optimal conditions, the SERS signal intensity of oxTMB (at 1605 cm−1) was proportional to the concentration of Gly. The results showed a good linear response over the concentration ranges of 10 μg L−1 to 1000 mg L−1. The limit of detection and limit of quantitation of Gly were found to be 5 μg L−1 and 10 μg L−1, respectively. In addition, good anti-interference ability against interfering cations and structural analogues deserves to be mentioned. This SERS assay can be used for detection of Gly in tap water that can meet the needs of practical detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2020
·Vol. 10
·期 10
·1192
·
IF 3.52
Jun Yan,Longlong Shan,Xiaoli Gu,Xingguang Zhang,Junmeng Cai
Three series of catalysts consisting of gold (Au), platinum (Pt), or gold-platinum bimetallic nanoparticles (NPs) with controlled sizes (Au NPs 10 ± 2 nm, Pt NPs 6 ± 2 nm) anchored on hierarchical micro-/meso-/macroporous silica were successfully developed and systematically evaluated for the selective oxidation of aromatic alcohols to their corresponding aldehydes. The catalysts were prepared by the sol-immobilization method using as-made Au NPs and/or Pt NPs colloids; the silica supports were prepared with controlled pore structures and the hierarchical porous structures of catalysts were created by controllable desilication via the alkaline solution of the metal colloids. The catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS), and these results showed no synergistic effect between Au and Pt on boosting the catalytic performance, whereas they demonstrated a clear dependence of catalytic conversions and reaction rates on the structural porosity of Au-Pt bimetallic catalysts. Our findings could potentially inspire peer researchers and scientists to develop designer porous catalysts and processes in the selective organic conversions.Keywords:steric effect;Au-Pt catalysts;alcohol oxidation;hierarchical porous silica
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 13
·期 1
·160-172
·
IF 8.183
Zhang Amin,Zhang Qian,Alfranca Gabriel,Pan Shaojun,Huang Zhicheng,Cheng Jin,Ma Qiang,Song Jie,Pan Yunxiang,Ni Jian,Ma Lijun,Cui Daxiang
Distinctively different metabolism between tumor cells and normal cells endows tumor tissues unique microenvironment. In this regard, we have successfully prepared a sequential catalytic platform based on Au/Pt star for tumor theragnostic. The multifunctional probes consisted of a gold/platinum star-shaped core (Au/Pt star) conjugated with a GSH-sensitive disulfide bond (S–S), a targeting ligand (rHSA-FA), a near-infrared fluorophore (IR780) and glucose oxidase (GO x ). When systemically administered in a xenografted murine model, the probes specifically targeted the tumor sites. As the disulfide linker was cleaved by intracellular GSH, the IR780 molecules could be released for photo-thermal therapy & photodynamic therapy (PTT&PDT) and imaging. Subsequently, the Pt nanolayer of the Au/Pt star and the GO x formed a sequential catalytic system: GO x effectively catalyzed intracellular glucose by consuming oxygen to generate H 2 O 2 and enhance the local acidity, and the Pt layer exhibited peroxidase-like property to catalyze H 2 O 2 producing toxic ·OH for tumor oxidative damage. Here we demonstrated that our probes simultaneously possessed a GSH-sensitive release, real-time imaging ability, and synergetic cancer starving-like therapy/enzyme oxidative therapy/PTT/PDT features, which provides a potential strategy for effective tumor theragnostic.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2018
·
IF 2.275
Fanjun Zhu,Guangying Zhao,Wenchao Dou
Herein, a non-enzymatic sandwich-type electrochemical immunoassay was fabricated for quantitative monitoring of Escherichia coli O157:H7 ( E. coli O157:H7). Silica coated Fe 3 O 4 magnetic nanoparticles (Fe 3 O 4 @SiO 2 ) were modified with mouse anti- E. coli O157:H7 monoclonal antibody (Ab 1 ) to act as capture probes to reduce detection time and increase the sensitivity of the immunoassay . The Au@Pt nanoparticles were loaded on neutral red (NR) functionalized graphene to form composite complex rGO-NR-Au@Pt. rGO-NR-Au@Pt has high specific surface area and good biocompatibility. rGO-NR-Au@Pt was used as the carriers of detection antibodies (Ab 2 ). Au@Pt catalyzed the reduction of hydrogen peroxide (H 2 O 2 ) to detection of E. coli O157:H7 with the thionine (TH) as electron mediator to effectually amply the current signal. Under the optimized conditions, a linear relationship between the reduction peak current change (ΔI pc ) and the logarithm of the E. coli O157:H7 concentration is obtained in the range from 4.0 × 10 3 to 4.0 × 10 8 CFU mL −1 and the limit of detection (LOD) is 4.5 × 10 2 CFU mL -1 at a signal-to-noise ratio of 3. The immunoassay exhibits acceptable specificity, reproducibility and stability on the detection of E. coli O157:H7. Furthermore, the immunoassay showed good performance in pork and milk samples. The results suggest that this immunoassay will be promising in the food safety area.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2017
·
IF 4.162
Chi-Fang Peng,Na Pan,Qian Zhi-Juan,Xin-Lin Wei,Guang Shao
In this work, core-shell Au@Pt nanocatalysts (Au@Pt NCs) with ultrathin Pt shell were synthesized and demonstrated high peroxidase-like activity. Thiocyanate ions (SCN - ) were found to effectively inhibit the peroxidase-like activity of Au@Pt NCs, and the mechanism was discussed by the characterization of TEM , DLS, EPR and XPS, etc. The inhibition of the catalytic activity of Au@Pt NCs by SCN - was mainly due to the decreased ability of the Au@Pt NCs for capturing • OH radicals and the increased ratio of Pt 2+ to Pt° on the surface of the Au@Pt NCs. A sensitive colorimetric detection of thiocyanate (SCN - ) was developed, based on the activity inhibition of Au@Pt NCs by SCN - . Interestingly, cystine modification of Au@Pt NCs was found to significantly improve the selectivity of SCN - recognition. After optimization, a colorimetric assay for SCN - was established with a detection limit of 5.0 nM and a broad linear calibration over the range of 20 nM to 40 µM. This assay has the advantages of highly sensitive, selective and low-cost. Moreover, this assay demonstrated highly potential application in the quantitative determination of SCN - in water and raw milk samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2016
·
IF 4.712
Long Wu,Wenmin Yin,Kun Tang,Dian Li,Kang Shao,Yunpeng Zuo,Jing Ma,Jiawei Liu,Heyou Han
A new electrochemical method has been proposed for the simultaneous determination of butylated hydroxyanisole (BHA) and propyl gallate (PG) in food matrices based on enzymatic biosensors . Spiny Au-Pt nanotubes (SAP NTs) was first synthesized and demonstrated to exhibit intrinsic peroxidase and catalase-like activity. The structure of SAP NTs provides large surface area and favorable medium for electron transfer , on which HRP were immobilized and acted as enzymatic biosensor for the simultaneous detection of BHA and PG. The results revealed that BHA and PG both have well-defined oxidation waves with peak potentials of 624 and 655 mV, respectively. Under the optimal conditions, the method behaved satisfactory analytical performance towards BHA and PG with a wide linear range of 0.3–50 mg L −1 and 0.1–100 mg L −1 , as well as a detection limit of 0.046 mg L −1 and 0.024 mg L −1 (3σ/slope), respectively. Besides, the proposed method exhibits good sensitivity, stability and reproducibility, providing an alternative to fabricate electrode and construct sensitive biosensors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Long Wu,Wenmin Yin,Xuecai Tan,Pan Wang,Fan Ding,Huan Zhang,Biru Wang,Weiyun Zhang,Heyou Han
It is attractive but remains challenging to develop nanomaterials-based methods to realize the colorimetric detection of ultratrace biological analytes. In this work, an HAuCl 4 -H 2 O 2 system was developed for the visual detection of intracellular hydrogen peroxide (H 2 O 2 ) based on the Au-Pt/SiO 2 sensing platform. Owing to their excellent intrinsic peroxidase-like activity, Au-Pt/SiO 2 nanospheres were introduced to catalyze the decomposition of H 2 O 2 and then directly reduce HAuCl 4 into gold nanoparticles (Au NPs) for the naked-eye detection. The produced Au NPs behaved color variations from light purple to wine red as H 2 O 2 concentration increased. Under the optimal conditions, this strategy showed excellent sensitivity for H 2 O 2 with a detection limit of 0.1 nM by naked-eye readout and 0.1 pM by UV–vis spectrometer (S/N = 3), as well as acceptable selectivity for H 2 O 2 , which could meet the demand for the detection of H 2 O 2 in biological systems. The method was further validated by the determination of H 2 O 2 in HeLa cells with low cellular cytotoxicity. Thus, this strategy would provide simple and sensitive detection of H 2 O 2 in biological systems, revealing the potential application in clinical, biological and environmental researches.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Hongchao Zhao,Jing Li,Xiaopeng She,Yi Chen,Mengqing Wang,Yanjie Wang,Aijun Du,Cheng Tang,Cheng Zou,Yong Zhou
Sensitive and selective acetone detection is of great significance in the fields of environmental protection, industrial production, and individual health monitoring from exhaled breath. To achieve this goal, bimetallic Au@Pt core–shell nanospheres (BNSs) functionalized-electrospun ZnFe2O4 nanofibers (ZFO NFs) are prepared in this work. Compared to pure NFs-650 analogue, the ZFO NFs/BNSs-2 sensor exhibits a stronger mean response (3.32 vs 1.84), quicker response/recovery speeds (33 s/28 s vs 54 s/42 s), and lower operating temperature (188 vs 273 °C) toward 0.5 ppm acetone. Note that an experimental detection limit of 30 ppb is achieved, which ranks among the best cases reported thus far. Besides the demonstrated excellent repeatability, humidity-enhanced response, and long-term stability, the selectivity toward acetone is remarkably improved after BNSs functionalization. Through material characterizations and DFT calculations, all these improvements could be attributed to the boosted oxygen vacancies and abundant Schottky junctions between ZFO NFs and BNSs, and the synergistic catalytic effect of BNSs. This work offers an alternative strategy to realize selective subppm acetone under high-humidity conditions catering for the future requirements of noninvasive breath diabetes diagnosis in the field of individual healthcare.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 10
·838
·
IF 4.4
Hangyu Yan,Guowei Li,Fengyuan Zhang,Jingsong Liu,Mengdai Luoshan
Noble metal nanomaterials with a localized surface plasmon resonance effect exhibit outstanding advantages in areas such as photothermal therapy and photocatalysis. As a unique plasmonic metal nanostructure, gold nanobipyramids have been attracting much interest due to their strong specific local electric field intensity, large optical cross sections, and high refractive index sensitivity. In this study, we propose a novel three-component hetero-nanostructure composed of rough gold nanobipyramids (R-Au NBPs), Pt, and CdS. Initially, purified gold nanobipyramids are regrown to form R-Au NBPs that have a certain degree of roughness. These R-Au NBP substrates with a rough surface provide more hotspots and strengthen the intensity of localized electric fields. Subsequently, Pt and CdS nanoparticles are selectively deposited onto the surface of R-Au NBPs. Pt nanoparticles can provide more active sites. Each component of this hetero-nanostructure directly contacts others, creating multiple electron transfer channels. This novel design allows for tunable localized plasmon resonance wavelengths ranging from the visible to near-infrared regions. These factors contribute to the final superior photothermal conversion performance of the R-Au/Pt-CdS nanohybrids. Under the irradiation of near-infrared light (1064 nm), the photothermal conversion efficiency of R-Au/Pt-CdS reached 38.88%, which is 4.49, 1.5, and 1.22 times higher than that of Au NBPs, R-Au NBPs, and R-Au NBPs/Pt, respectively.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Qing Yu,Shiyi Wang,Mengru Wang,Xiaoling Mou,Ronghe Lin,Yunjie Ding
Acetylene coupling with ethylene dichloride, which uses both coal and oil resources, is attractive for sustainable PVC manufacturing. Herein, highly active and stable carbon nitride-based catalysts were developed by a novel pre-oxidation-pyrolysis process, affording unprecedented dehydrochlorination activity with good durability. The best-performing system was further modified with different precious metals (Au, Pt, and Ru) to promote the hydrochlorination chemistry between the in-situ formed hydrogen chloride and acetylene co-feed. The presence of metal centers intensifies the hydrochlorination activity but weakens the dehydrochlorination ability due to competitive adsorption between the two reactants at the metal sites. Superior coupling performance was achieved over C 3 N 4 /AC and single-atom Au/C 3 N 4 /AC catalysts in cascade reactors. Our results strongly suggest that dehydrochlorination is an essential step in the coupling reaction, and the activation of acetylene and ethylene dichloride molecules requires different active sites that should be engineered in future work.
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2026
·
IF 9.8
Boyan Sun,Linqian Qin,Vasily G. Panferov,Chujun Liu,Xiaomei Wang,Jiankang Ren,Qian Ran,Sihan Wang,Haiyang Jiang
Ractopamine (RAC), a banned β-adrenergic agonist, poses severe risks to human health, necessitating rapid and ultrasensitive detection methods. This work presents a novel dual-mode immunoassay utilizing peroxidase-mimicking Au@Pt core-shell nanozymes for the colorimetric and photothermal detection of RAC. The optimized one-step synthesized Au@Pt nanoparticles (Au/Pt = 1:1) exhibited exceptional peroxidase-like activity (27.32 U/mg). After conjugation with monoclonal antibodies, the nanozymes served as immunoprobes in a one-step enzyme-linked immunosorbent assay (ELISA). The enhanced catalysis was elucidated by reactive oxygen species trapping, confirming hydroxyl radicals and singlet oxygen as key intermediates. The assay demonstrated outstanding sensitivity, with limits of detection at 5.32 pg/mL (colorimetric) and 1.03 pg/mL (photothermal), a significant improvement over conventional ELISA. Practical applicability was confirmed in spiked pork and pig urine, achieving recoveries of 86.0–113.0% (coefficient of variation<14.3%), offering a robust platform for on-site screening.
✓ 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）