COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Jinglin Shen,Yue Bi,Hao Zhang,Liandi Xu,Jin Feng,Wei Qi
Gold nanoclusters (AuNCs) are a class of promising inorganic-organic hybrid nanomaterials with exceptional photoluminescent properties. The understanding of their photoluminescent mechanism is important for developing functional AuNCs-based materials. In this work, thiobarbituric acid-modified AuNCs (TBA-AuNCs) was prepared and its photoluminescent property was modulated through co-assembly with Ba 2+ . The emission intensity was sharply enhanced with the formation of TBA-AuNCs/Ba 2+ complex. Structural characterization including transmission electron microscopy , scanning electron microscopy and X-ray photoelectron spectroscopy confirmed the hybridization of TBA-AuNCs with Ba 2+ . The pH-dependent photoluminescence as well as zeta potential measurements demonstrated that the ligand to metal charge transfer (LMCT) is crucial for the regulation of emission property of the TBA-AuNCs/Ba 2+ . Based on this special photoluminescent mechanism, the TBA-AuNCs/Ba 2+ complex was employed as a chemical sensor for nitro-substituted aromatic compounds . The emission intensity of TBA-AuNCs/Ba 2+ selectively displayed sharp quenching in response to 2-methyl-4-nitroimidazole among various imidazole derivatives. Simultaneously, the complex also showed high sensitivity toward p -nitroaniline and 2-nitrophenol. Therefore, the developed TBA-AuNCs/Ba 2+ assemblies are potential in detecting the nitro-containing compounds, which will find applications in pharmaceutical analysis, environmental protection and other related fields.
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Green Energy & Environment
·
2020
·
IF 6.395
Zhaoning Song,Juncong Yuan,Zhenping Cai,Dong Lin,Xiang Feng,Nan Sheng,Yibin Liu,Xiaobo Chen,Xin Jin,De Chen,Chaohe Yang
The advocacy of green chemical industry has led to the development of highly efficient catalysts for direct gas-phase propene epoxidation with green, sustainable and simple essence. The S-1/TS-1@dendritic-SiO 2 material with three-layer core–shell structure was developed and used as the support for Au catalysts, which showed simultaneously fantastic PO formation rate, PO selectivity and stability (over 100 h) for propene epoxidation with H 2 and O 2 . It is found that silicalite-1 (S-1) core and the middle thin layer of TS-1 offer great mass transfer ability, which could be responsible for the excellent stability. The designed dendritic SiO 2 shell covers part of the acid sites on the external surface of TS-1, inhibiting the side reactions and improving the PO selectivity. Furthermore, three kinds of SiO 2 shell morphologies (i.e., dendritic, net, mesoporous shell) were designed, and relationship between shell morphology and catalytic performance was elucidated. The results in this paper harbour tremendous guiding significance for the design of highly efficient epoxidation catalysts.
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ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Jun-Tao Cao,Yu-Xiang Dong,Yan Ma,Bing Wang,Shu-Hui Ma,Yan-Ming Liu
Photoactive materials with high photo-electron transfer efficiency and stable signal output hold a key role in constructing the photoelectrochemical (PEC) biosensing systems. In this study, the ternary [email protected] 3 N 4 heterojunction was first prepared and characterized, and its application in PEC bioanalysis was explored. The gold nanoparticles sandwiched between CdS and g-C 3 N 4 , acting as both plasmonic photosensitizer and electron relay, significantly boosted the light absorption and accelerated the charge transfer from g-C 3 N 4 to CdS, both of which contributed to the enhancement of photoelectric conversion efficiency. Signal quenching with graphene oxide-CuS efficiently weakened the photocurrent from [email protected] 3 N 4 . The combination of the excellent PEC properties of [email protected] 3 N 4 and the remarkable quenching effects of graphene oxide-CuS enabled construction of a sandwich-type PEC immunosensor for prostate specific antigen (PSA) detection. This immunosensor achieved sensitive PSA analysis by multiple signal amplification mechanisms, with a detection limit of 0.6 pg mL −1 and a wide linear range from 1.0 pg mL −1 to 10 ng mL −1 . This work not only demonstrates the great potential of noble metal sandwiched ternary heterojunctions in the PEC field, but also lays a foundation for developing the general PEC immunoassays .
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高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Nuo Duan,Shuo Qi,Yucong Guo,Wei Xu,Shijia Wu,Zhouping Wang
Clenbuterol hydrochloride (CLB), a kind of β-agonist, has been illegally used as a feed additive for growth promotion in the food industry in many countries. Herein, surface-enhanced Raman scattering (SERS) combined with aptamer recognition was used for the ultrasensitive and quantitative detection of CLB. Fe 3 O 4 @ [email protected] nanoparticles displaying strong SERS enhancement were synthesized and used as the active substrate. Aptamer against CLB was immobilized on the surface of the substrate to form the capture probe. The complementary DNA (cDNA) was linked to gold nanoparticles (AuNPs) carrying the Raman reporter 4-mercaptobenzoic acid (4-MBA) to form the signal probe. The detection of CLB was carried out by competitive binding between free CLB and cDNA linked on the signal probe with the aptamer immobilized on the capture probe. The SERS intensity was significantly improved by the coupling effect between the Fe 3 O 4 @ [email protected] and AuNPs, resulting in high sensitivity for the quantification assays with a limit of detection of 0.003 ng mL −1 . The recoveries of the CLB from spiked pork samples were 90.7–108.0% and the coefficients of variation (CV%) were 2.2–3.1%, demonstrating the high precision and accuracy of the assay.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
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IF 3.573
Jincheng Mu,Jianfang Liu,Zhenzhen Ran,Muhammad Arif,Min Gao,Chen Wang,Shengfu Ji
MOF-808(Zr) with the coordinated unsaturated (CUS) Zr4+ centers was synthesized by the thermal reflux method, and a series of Au/MOF-808(Zr) catalysts with different Au loading percentages have been prepared by the impregnation–reduction method. The related X-ray diffraction, Fourier transform infrared spectroscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption–desorption, Inductively coupled plasma-mass spectrometry, and NH3 temperature-programmed desorption characterizations have been undertaken to understand the structure of catalysts. The catalytic activity in CO2 with aniline/H2 to N-methylation and N-formylation has been studied in a batch reactor. Results show that the MOF-808(Zr) structures in catalysts are of high quality and damage-free. The Au nanoparticles (NPs) are highly dispersed on the surface of the MOF-808(Zr) cage with a mean size of 2–20 nm. Also, the catalysts could catalyze the conversion of CO2 with aniline/H2 to N-methylation and N-formylation products with a high efficiency. With a 3.0 wt % Au/MOF-808(Zr) catalyst, the conversion of aniline is 18.4%, and the selectivity of N-methylaniline is 80.9% and that of N,N-dimethylaniline is 19.1%. The preliminary reaction mechanism and the critical role of CUS were also studied. It is determined that H2 is adsorbed and activated on Au NPs. CO2 is adsorbed on the CUS Zr4+ acidic sites and O2– basic sites. The primary and secondary amines are adsorbed on the CUS Zr4+ acidic sites, where they react with CO2 and H2 to form N-formamide. Subsequently, N-formamide reacts with activated H2 to yield N-methylamine.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
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IF 5.479
Zhong Yao,Yu Xinyue,Fu Wanying,Chen Yanwei,Shan Guiye,Liu Yichun
Gold-silver core-shell nanoparticles (Au@Ag NPs) were prepared by two successive reductions in a seed-growth method. The Au@Ag NPs are used as both a colorimetric and Raman spectroscopic probe for ultrasensitive determination of H 2 O 2 and glucose. It is found that H 2 O 2 (as produced from glucose by the action of glucose oxidase) can directly oxidize and gradually corrode the silver shell of the Au@Ag NPs. This results in a drop in the surface plasmon resonance absorbance at 400 nm, and the color of the solution changes from brownish yellow to purple. Without adding any additional chromogenic agents, the color change can be visually observed and detected photometrically. Silver NPs also are an excellent surface-enhanced Raman scattering (SERS) substrate. Due to corrosion of the silver shell, the SERS intensity (measured at 1083 cm −1 ) gradually decreases with increasing glucose concentration. The detection limits are 300 nM of glucose for the colorimetric assays, and 20 nM for the SERS assay.
Schematic representation of the method for glucose determination. H 2 O 2 can oxidize and gradually corrode the silver shell of the gold-silver core-shell nanoparticles. This results in a distinct color change of the solution from brownish yellow to purple, and a drop in SERS intensity. The effect is applied in colorimetric and Raman spectroscopic assays for glucose.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
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IF 6.393
Nian Cao,Faqiong Zhao,Baizhao Zeng
In this work, a novel self-enhanced solid state electrochemiluminescence (ECL) platform, based on polyethyleneimine (PEI) capped CdS quantum dots (PEI-CdS QDs) as coreactant and [email protected] 2 @Ru(bpy) 3 2+ doped silica ( [email protected] 2 @RuDS) nanocomposite as ECL emitter, was constructed. The PEI-CdS QDs integrated double coreactant of PEI and CdS QDs, thus significantly promoted the ECL of [email protected] 2 @RuDS. Polyaniline hydrogel was introduced to boost the electron transfer and to improve the immobilization of PEI-CdS/ [email protected] 2 @RuDS. In addition, creatinine imprinted poly(o-aminophenol) film was electrodeposited on the PEI-CdS/ [email protected] 2 @RuDS surface as recognition element. Thus, the obtained sensor possessed high sensitivity, stability, reproducibility and selectivity for creatinine sensing. The change of ECL intensity and logarithm of creatinine concentration showed a good linear relationship in the range of 0.05 nM to 5 μM, and the detection limit was low to 0.02 nM. The sensor was applied to detect creatinine in human serum and urine samples, and the results were in good agreement with those of commercial enzyme-linked immunosorbent assay kit.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Chang Wang,Shihao Zhou,Qingqiang Cui,Mengya Zhang,Linqi Zheng,Shuang Li,Xiangdong Liu,Ming Chen
Photo-thermal catalytic (PTC) degradation as an ideal candidate for wastewater treatment is yet suffering from the unsatisfied recyclability due to the thermal effect-exacerbated serious photocorrosion of semiconductor-based catalysts. Based on polymeric graphite carbon nitride (g-C 3 N 4 ) hybridized with antioxidative hexagonal boron nitride (h-BN) and grafted with stable Au nanoparticles (NPs), we provide thermostable g-C 3 N 4 /h-BN/Au nano-catalysts for high-efficient degradation of organic dyes at solar-activated heating condition. The fantastic PTC activity with optimal degradation rate up to ∼ 0.30 min −1 is far better than most mainstream hybrid catalysts. The unprecedented thermal recyclability is convincingly verified by consecutive 10 repeated tests within 500 min measurements under solar-driven heating condition (∼60 °C), wherein the negligible drop of degradation efficiency is only ∼ 0.2% lower than pristine one. The ingenious self-floating PTC membranes can be conveniently established by immobilizing the resultant nano-catalysts into bio-carbon porous frames and viscous bacterial nano-celluloses, facilitating practical wastewater decontamination in real-world scenarios.
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CHEMICAL PAPERS
·
2023
·Vol. 77
·期 12
·7577-7587
·
IF 2.2
He Jintao,Zhang Baozhong,Tian Panpan,Li Ying,Liu Xiaolong,Ma Xinyue,Lin Min,Zhu Huina,Chen Hanyu,Li Liping,He Baoshan
Cadmium (Cd), a typical heavy metal not essential for the human body, can cause harm to the liver and kidneys upon exposure. Hence, rapid cadmium detection in the environment is of utmost importance. This research presents an effective approach for detecting divalent cadmium ions (Cd 2+ ) using a sensitive dual hairpin (HP) electrochemical aptasensor. The aptasensor incorporates AuPd/Fe-MOF as signal labels and Au/Cu 2 O as the substrate material, and the rapid detection of divalent cadmium ions (Cd 2+ ) was based on catalytic hairpin self-assembly (CHA), as the recognition strategy. Au/Cu 2 O increased the specific surface area of the electrode and provided abundant sites for capturing the complementary deoxyribonucleic acid (CDNA) probe. The electrochemical signal is then amplified through synergistic catalytic hydrogen peroxide with AuPd/Fe-MOF, thereby enhancing the aptasensor's sensitivity. Moreover, the dual HP design effectively reduces the likelihood of non-specific capture and minimizes false positives. In this study, various analytical techniques were utilized to characterize the material and evaluate the aptasensor's performance. The morphological characteristics of the material were observed using scanning electron microscopy (SEM). Energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were employed to analyze the elemental composition and distribution of the material, respectively. The electrochemical behavior of the sensor was studied using cyclic voltammetry (CV), while electrochemical impedance spectroscopy (EIS) helped understand the aptasensor's assembly process. Furthermore, the aptasensor's performance was assessed using differential pulse voltammetry (DPV). Under the optimized experimental conditions, the constructed sensor demonstrated effective detection of Cd 2+ in the concentration range of 10 –4 –10 µM, with a remarkably low detection limit of 2.27 × 10 –5 µM. The feasibility of the sensor was validated by successfully detecting Cd 2+ in real water samples. .
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Xiaobo Zhang,Zhiru Li,Lili Yang,Bing Hu,Qiuyue Zheng,Jiang Man,Jijuan Cao
The sensitive and accurate detection of ochratoxin A (OTA) is crucial for public health due to its high toxicity. Herein, using Au nanoparticle (NP)-attached CdS/UiO-66-NH2 heterostructures as photoactive materials, a photoelectrochemical (PEC) aptasensor was presented for the ultrasensitive assay of OTA based on a competitive displacement reaction triggering the trans-cleavage ability of CRISPR/Cas12a. In this sensing strategy, methylene blue-labeled single-stranded DNA (MB-ssDNA) was immobilized on the Au NPs/CdS/UiO-66-NH2 electrode to accelerate the separation of the photogenerated carrier, thus producing a significantly increased PEC response. In the presence of OTA, it specifically bound with the aptamer (Apt) and resulted in the release of the activation chain, triggering the trans-cleavage characteristics of CRISPR/Cas12a. MB-ssDNA was cut randomly on the electrode surface to convert the PEC signal from the “on” to the “off” state, thereby achieving a quantitative and accurate detection of OTA. The CRISPR/Cas12a-derived PEC aptasensor exhibited excellent sensitivity and specificity, with a linear range from 100 to 50 ng/mL and a detection limit of 38 fg/mL. Overall, the proposed aptasensor could provide a rapid, accurate, and sensitive method for the determination of OTA in actual samples.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zeyu Liu,Xiaohan Shan,Qiang Xue,Yao Liu,Lin He,Haijiao Xie
In this study, we employed a straightforward and rapid one-step electrodeposition method to enhance modify an Au/NiO/Rh composite on laser-induced graphene (LIG) for nitrite (NO 2 – ) detection. We extensively characterized and tested the morphological composition and electrochemical properties of the electrode using scanning electron microscopy and other characterization techniques. To compare the electrochemical active surface areas of the electrode before and after modification, we conducted cyclic voltammetry experiments. Additionally, we confirmed the changes in electron transfer performance and adsorption energy of the modified electrode through by density functional theory calculations. The experimental results demonstrate that the combined modification of LIG with rhodium nanoparticles (RhNPs) and gold nanoparticles (AuNPs) improves electron transport ability at the electrode interface and enhances the electrode's electrocatalytic performance. The incorporation of nickel oxide (NiO) also provides a larger reaction area and more active sites for NO 2 – detection. The synergistic effects of these three modified components significantly enhance NO 2 – detection at the electrode, surpassing the performance of the bimetallic modified electrode. Under optimized experimental conditions, the sensor exhibits a linear range of 1 μmol/L to 1 mmol/L and a detection limit of 0.3 μmol/L. Furthermore, the sensor demonstrates excellent anti-interference and repeatability properties. We successfully applied the sensor for determination of NO 2 – in tap water, yielding satisfactory results. This research presents a promising strategy for the portable, sensitive, and in-situ detection of NO 2 – in water environments using metal-based electrochemical sensors.
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ANALYTICAL LETTERS
·
2023
·
IF 2
Xiaoyu Zhang,Peiran Meng,Wei Wang,Xiwen Li,Zuan Yang,Shaokai Du,Yue Sun
Simultaneous determination of erythromycin (Ery) and hemoglobin (Hb) is of great significance for clinical diagnosis of many diseases. ZnO nanorods modified with Au nanoparticles were fabricated as an interface on the flexible carbon cloth (CC) and utilized to simultaneously determine Ery and Hb by a simple electrochemical method. The results demonstrated that Au/ZnO/CC displayed excellent analytical performance for Ery with a low detection limit of 3.38 × 10−7 mg/L and a linear range from 1 × 10−6 to 1 × 10−1 mg/L. At the same time, the sensor also showed a sensitive response to Hb with a low detection limit of 2.07 × 10−7 mg/L and a linear range from 1 × 10−6 to 1 × 10−1 mg/L. This work provides a viable approach for designing a flexible electrode and sensitive simultaneous determination of Ery and Hb.
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