JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2017
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IF 4.421
Bowen Li,Yidi Wang,Fangyuan Tian,Guanshu Li,Zhaohong Zhang,Jun Wang,Youtao Song
In order to expand the light response range of wide band-gap semiconductor photocatalyst (NaTaO 3 ) for effective photocatalytic conversion of Cr(VI), an up-conversion luminescence agent (Er 3+ :YAlO 3 ) is combined with NaTaO 3 and a visible-light driven photocatalyst, NaTaO 3 /Er 3+ :YAlO 3 , is prepared. Moreover, several conduction band co-catalysts (Ag, Au and Pt) are deposited the surface of NaTaO 3 /Er 3+ :YAlO 3 , respectively, to facilitate the transfer rate of photo-generated electrons. X-ray diffractometer (XRD), energy dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM) analyses are employed to confirm the morphology, microstructure and composition of the prepared photocatalysts. In addition, UV–vis diffuse reflectance spectra are determined to explore the visible-light absorption properties of Er 3+ :YAlO 3 , NaTaO 3 , NaTaO 3 /Er 3+ :YAlO 3 and X/NaTaO 3 /Er 3+ :YAlO 3 (X = Ag, Au and Pt). Photoluminescence (PL) spectra are used to estimate the recombination rate of electron–hole pairs. The effects of irradiation time, photosource kind, solution acidity and used times on the photocatalytic capabilities of NaTaO 3 /Er 3+ :YAlO 3 and X/NaTaO 3 /Er 3+ :YAlO 3 (X = Ag, Au and Pt) are investigated in detail. The results show that the uses of up-conversion luminescence agent (Er 3+ :YAlO 3 ) and co-catalysts (Ag, Au and Pt) can promote NaTaO 3 to utilize visible-light to carry out the photocatalytic conversion of Cr(VI). Particularly, the prepared Au/NaTaO 3 /Er 3+ :YAlO 3 nanocomposite with 1.0 wt% Au and 0.3:1.0 molar ratio of Er 3+ :YAlO 3 and NaTaO 3 shows the highest photocatalytic activity in conversion of Cr(VI).
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TALANTA
·
2015
·
IF 3.545
Junrong Li,Guannan Zhang,Lihua Wang,Aiguo Shen,Jiming Hu
In this work, we suggest a chitosan-modified popcorn-like Au–Ag nanoparticles (CSPNPs) based assay for high sensitive detection of melamine , in which CSPNPs not only provide with an intrinsic peroxidase-like activity but also act as surface enhanced Raman scattering (SERS) substrates. CSPNPs can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 to the charge transfer complex (CTC), which contributes to a tremendous surface-enhanced resonant Raman scattering (SERRS) signals with 632.8 nm laser excitation. The target molecule melamine can generate an additional compound with H 2 O 2 , which means the available amount of H 2 O 2 for the oxidation of TMB reduced. Correspondingly, the SERRS intensity of CTC is decreased. The decreased Raman intensity is proportional to the concentration of melamine over a wide range from 10 nM to 50 μM ( R 2 =0.989), with a limit of detection (LOD) of 8.51 nM. Moreover, the proposed highly selective method is fully capable of rapid, separation-free detection of melamine in milk powder.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Xuan Xu,Qiqin Zheng,Guangmin Bai,Lishu Song,Yuewei Yao,Xiaodong Cao,Songqin Liu,Cheng Yao
Bisphenol A (BPA) is one of the most prevalent environmental endocrine disrupting chemicals with potential estrogenic activity. Herein we report a facile electrochemical sensing strategy for ultrasensitive detection of BPA based on the hybrid of AuNPs decorated reduced graphene oxide (RGO). This Au@PDA-RGO hybrid was synthesized by in-situ growth of AuNPs induced by polydopamine (PDA) on RGO. Since PDA acts as a moderate reducing agent and an effective linker, AuNPs scatter well on RGO with controllable density, homogeneous size and uniform distribution. With the aid of chitosan (Chit), an electrochemical tyrosinase (Tyr) biosensor based on Au@PDA-RGO was constructed on glassy carbon electrode (Tyr/Au@PDA-RGO-Chit/GCE). This immobilization matrix possesses high conductivity, large active areas and a suitable biological microenvironment. As a result, the constructed Tyr biosensor exhibited good analytical performance for BPA with a high sensitivity of 0.2569 A M −1 , a wide linear range from 12.5 nM to 3.68 μM, and a low detection limit of 0.10 nM (S/N = 3). This method was also applied to detect BPA in plastic products, showing good agreement with the values detected by HPLC-MS/MS.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Yicheng Wei,Xiaojian Li,Xu Sun,Hongmin Ma,Yong Zhang,Qin Wei
Combining dual-signal channels of differential pulse voltammetry (DPV) and amperometric i–t curve, we developed an amplified sandwich-type electrochemical immunosensor for ultrasensitive detection of prostate specific antigen (PSA). Due to the large specific surface area and good adsorption property, 3-aminopropyltriethox functionalized CeO 2 mesoporous nanoparticles (NH 2 -M-CeO 2 ) was used for supporting toluidine blue (TB) as the electron transfer mediator and anti-PSA as the signal response. To prevent the leak of TB and facilitate the electron transfer property of NH 2 -M-CeO 2 , ionic liquids doped carboxymethyl chitosan (CMC/ILs) were incorporated and TB/M-CeO 2 /CMC/ILs complex was gotten to act as the label of anti-PSA (Ab 2 ). Meanwhile, Au-CoS/graphene was as the matrix materials modifying the electrode to immobilize anti-PSA (Ab 1 ). Specifically, Au-CoS/graphene cannot produce electrochemical signals through DPV method but can provide an obviously electrochemical signal towards catalysis hydrogen peroxide (H 2 O 2 ) through amperometric i–t curve method. At the time of detection, with the increase of concentrations of PSA, the DPV signals from TB/M-CeO 2 /CMC/ILs were increased and the amperometric i–t curve signals from the Au-CoS/graphene were decreased. Under the optimum conditions, the immunosensor demonstrated remarkable analytical performance of a linear range of 0.5 pg/mL to 50 ng/mL with a detection limit of 0.16 pg/mL for quantitative detection of PSA (S/N=3).
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Zhiwei Wang,Guangyuan Hu,Changqing Xia,Xinliang Wang,Hongxing He,Zhifeng Nie,Shixing Wang,Weili Li
The recovery and utilization of precious metals from secondary resources are important owing to their pivotal role in modern technology. In this study, we successfully grafted diamine onto UiO-67, modulated its charge and functionalization, and developed a highly efficient adsorbent for the extraction of Au(III) from waste solutions. The recovery rate of UiO-67-(NH 2 ) 2 for trace gold is >99 % in the wide range of pH 3 to 9. The maximum adsorption capacity of UiO-67-(NH 2 ) 2 at a temperature of 298 K is 482 mg/L. In addition, UiO-67-(NH 2 ) 2 exhibits excellent selectivity to Au(III) in mixed metal ion waste solutions. After five cycles of adsorption–desorption experiments, the adsorption efficiency remains above 95 %. The identification of electrostatic interactions, coordination, and reduction as the primary adsorption mechanisms is supported by X-ray photoelectron spectroscopy (XPS) analysis of UiO-67-(NH 2 ) 2 and density functional theory (DFT) calculations.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jiasheng Fang,Zhenting Huang,Ming Chen,Shuo Zhao,Zhihui Liang,Qiongfang Zhuo,Yongfu Qiu
The utilization of natural clay minerals for synthesizing nano-sized metal-organic frameworks (MOFs) supported materials offers great advantages for rational design of innovative catalysts, which promotes the low-cost and large-scale environmental remediation applications. This work reported a facile and scalable encapsulation-pyrolysis strategy to prepare novel Au-HNTs@Co-NC core-shell catalyst for catalytic reduction of nitroaromatic pollutants. The HNTs were modified with aminosilane on the external surface for effectively anchoring well-dispersed and ultrasmall Au NPs. Uniform nano-sized ZIF-67 crystals controllably embraced the Au-HNTs via in-situ growth induced by electrostatic adsorption. The N 2 atmosphere pyrolysis at 550 °C resulted in Co NPs embedded into N-doped carbon substrates, and transformed ZIF-67 crystals into Co-NC layers for preferable encapsulation and stabilization of Au NPs. The as-prepared Au-HNTs@Co-NC-550 catalyst manifested splendid catalytic performance for p-nitrophenol reduction, and achieved the reaction rate constant and TOF value estimated as 2.025 min −1 and 49.25 min −1 , which significantly exceeded the behaviors of as-prepared control materials. Moreover, the catalyst also displayed excellent catalytic capability toward the reduction of nitroanilines and homologues and isomers of p-nitrophenol, indicative of its decent general applicability. After 8 cycles of reactions, the catalyst still retained brilliant reusability and structural stability with good magnetic property for expedient separation. The advantageous hollow core-shell structure combining HNTs and ZIF-67 derivatives enhanced the reactant diffusion and transfer. The N doping and electronegativity difference between Co and Au aroused higher electron uptake and facilitated electron transport during the reduction process. Meanwhile, the Co–H and Au–H bonds formed the strong synergistic effect for superior cooperative catalytic performance of the catalyst.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Tian Tian,Xuefeng Hu,Yao Huang,Huixian Du,Chao Wang,Mina Yang
The widespread utilization of fossil fuels has resulted in a significant increase in CO 2 emissions, leading to a variety of environmental issues. The photocatalytic conversion of CO 2 into fuel presents an effective solution to both the energy crisis and environmental warming. Therefore, the selection of a suitable catalyst is paramount. However, traditional photocatalysts often encounter challenges such as rapid electron-hole recombination and limited exposure of active sites. To improve these limitations, this study introduces AFM-X, a heterojunction catalyst composed of Au/Fe 3 O 4 /MIL-101(Fe)-X, which facilitates the formation of open metal sites (OMS) that enhance the effective separation of photogenerated carriers. In AFM-X, OMS function as Lewis acid sites, thereby enhancing CO 2 adsorption. The presence of Au nanoparticles (NPs) introduces additional active sites for CO 2 reduction. The synergistic effect between OMS and Au NPs increases the catalyst’s active sites, while the heterojunction construction promotes electron transfer, thereby enhancing CO 2 photocatalytic reduction efficiency. The CO generation rate of AFM-2 reached 98.8 μmol g −1 h −1 , surpassing those of FM, MIL-101(Fe), Fe 3 O 4 , and Au NPs, by 4.1, 6.3, 6.2, and 3.2 times, respectively. Furthermore, AFM-2 maintains stable performance over a 40 h cycle test. In-situ DRIFTS spectroscopy reveals that CO 2 reduction occurs through two parallel pathways. This study offers new insights into the design of composite photocatalytic materials, highlighting the effectiveness of OMS Lewis acid sites in significantly enhancing the photocatalytic reduction of CO 2 .
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TALANTA
·
2024
·
IF 5.6
Haoran Cheng,Yifan Wang,Yirui Zhao,Hongman Hou,Gongliang Zhang,Jingran Bi,Shuang Yan,Hongshun Hao
Salmonella enteritidis ( SE ) is a food-borne pathogens that can cause acute gastroenteritis. With the increasing social attention to food safety, the detection method of SE has attracted wide attention. In response to the demand for efficient detection methods of SE , this study constructed a novel dual-mode photoelectrochemical-electrochemical (PEC-EC) aptamer-based biosensor. The sensor was constructed using Bi 4 NbO 8 Cl/In 2 S 3 heterojunction as the electrode substrate material, the hybridization chain reaction (HCR) and dye sensitization were used as the signal amplification strategies. Bi 4 NbO 8 Cl/In 2 S 3 heterojunction could provide an excellent initial photocurrent response for the sensing platform, and the HCR was opened by the end of complementary DNA (cDNA) and generated an ultra-long DNA double-stranded (dsDNA) “super structure” on the surface of the electrode, which could be embedded with a large number of methylene blue (MB) as the bifunctional probes. Thus, dual-mode output was achieved via the PEC and EC activity of MB. Under the optimized conditions, the PEC and EC signal responses of the system were linear to the logarithm of SE concentration in a range from 1.5 × 10 2 CFU/mL to 1.5 × 10 7 CFU/mL. The detection limits were found to be 12.9 CFU/mL and 12.3 CFU/mL using the PEC and EC methods, respectively. The constructed dual-mode biosensor exhibited good performance for real sample analysis, and demonstrated great application potential in the field of SE rapid detection. Moreover, this dual-mode detection strategy provided more accurate and reliable results than the single-mode output.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Fenglei Liu,Baowei Hu
Recovery of precious metal ions in wastewater could not only improve resource utilization, but also could reduce environmental pollution. Herein, a composite of TpPa@Nb 2 C was constructed by an interfacial self-assembled method and explored the synergistic adsorption effects for precious metals. The structure and morphology of the composites were analyzed by advanced characterization techniques, followed by parametric analysis of Au(III)/Pd(II) adsorption from the simulated wastewater. The results showed that the grafting of COFs with abundant reducing active sites on the MXenes could significantly improve the selectivity and adsorption capacity. Meanwhile, the interaction was found as monolayer way and controlled by chemistry process, and the maximum equilibrium Au(III) and Pd(II) uptake reached up to 910.1 and 386.2 mg/g, respectively. The competitive adsorption study showed that the co-existence of impurities had little effect on the removal rate. The mechanism analysis demonstrated that the precious metal ions were reduced to elemental gold/palladium on the network of TpPa@Nb 2 C, and they got three electrons or two electrons from the hydroxyl groups through redox reaction, respectively. Thus, this study provided an excellent material for enrichment and recovery of precious metals in waste liquid and the treatment of e-waste.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
·
IF 5.3
Wang Yutong,Liang Xiao,Yang Yaling
Se-WCDs-Au-Janus Ag NPs with weak oxidase activity were synthesized using Se-W carbon dots (Se-WCDs) as stabilizers and reducing agents. These Janus nanoparticles (Janus NPs) effectively catalyze the reduction of mercury ions (Hg 2+ ) to metallic mercury (Hg 0 ), generating Au–Ag-Hg mercury alloys (Au–Ag@HgNPs). The aggregated Au–Ag@HgNPs on the nanoparticles improve the SERS activity of Se-WCDs-Au-Janus Ag NPs through a synergistic effect of electromagnetic enhancement and chemical enhancement. Interestingly, adding FB1 turns off the Raman signal by inhibiting the aggregation of Au–Ag@HgNPs. Based on these findings, a SERS “on–off” sensor utilizing the Se-WCDs-Au-Janus Ag NPs as the probe was successfully developed to determine fumonisin B1 (FB1) and Hg 2+ in grains. The detection limits were as low as 0.005 μg·L −1 for Hg 2+ and 0.006 μg·L −1 for FB1. Graphical abstract
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Asia-Pacific Journal of Chemical Engineering
·
2024
·
IF 1.4
Dan-Dan Cui,Xue-Ru Liu,Long-Yue Meng,Ying-ai Piao,Biao Jin
Adrenaline (AD) is important in information transmission through the human central nervous system. Considering the significant biochemical functions of AD, the development of electrochemical sensors capable of detecting AD levels in living organisms has attracted considerable interest. In this study, AD was detected using electrochemical sensors developed based on Au nanoparticles/ionic liquids/N- and P-co-doped carbon nanotubes-modified carbon cloth (AuNPs/ILs/N,P-MWCNTs/CC) electrodes. AuNPs/ILs/N,P-MWCNTs/CC composites were prepared on carbon cloth (CC) substrates using ionic liquids (ILs), N- and P-co-doped multi-walled carbon nanotubes (N,P-MWCNTs), and Au nanoparticles (AuNPs) as modified materials. The effects of pH and scanning speed were optimized and tested on the prepared composites. The results of cyclic voltammetry (CV) and differential pulse voltammetry (DPV) experiments showed that the modified ILs, N,P-MWCNTs, and AuNPs effectively improved the oxidation performance of AD. In addition, the linear range obtained from the DPV scans of the AuNPs/ILs/N,P-MWCNTs/CC composite material was 30–505 μmol/L, with a detection limit of 0.31 μmol/L. The fabricated sensors have good sensitivity (6.9 μA·mM −1 ·cm −2 ) for AD of 30–505 μM. Therefore, the electrochemical sensing method based on the AuNPs/ILs/N,P-MWCNTs/CC composite material is a promising and reliable AD detection technology that also exhibits good selectivity in the presence of interfering substances such as folic acid and ibuprofen. In practical applications, this material can help realize real-time AD detection to determine whether athletes use doping and other illegal drugs before competitions and to perform synchronous detection.
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CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Xue-Hui Shi,Leiming Tao,Lei Wang,Xing Liu,Shu-Lin Liu,Zhi-Gang Wang
In recent years, the application of both fluorescence and photothermal systems in one system has received great attention in the biomedical field. Yet, synthesizing a nanomaterial with both fluorescence (radiative decay) and a photothermal effect (nonradiative decay) is rarely reported. Here, we proposed novel plasmonic-fluorescent Janus Au-PbS nanoparticles (NPs) with tunable near-infrared II (NIR-II) fluorescence and photothermal effect to be used as a highly effective nanotheranostic for dual-modal NIR-IIb fluorescence imaging (FI)/computed tomography imaging (CT)-guided photothermal therapy. In addition, we investigated the equilibrium mechanism between the fluorescence and photothermal effects to guide the synthesis of this type of nanomaterial and found that the fluorescent semiconductor PbS quantum dots (QDs) receive electrons from Au NPs in Janus Au-PbS NPs, which could maintain the good fluorescence properties of Janus Au-PbS NPs. In addition, the alteration of electron and hole recombination between PbS QDs and Au NPs in Janus Au-PbS NPs increased nonradiative decay, leading to enhanced photothermal effects of Janus Au-PbS NPs. The electron receiver and electron–hole interactions in Janus Au-PbS NPs offered a fundamentally new means of engineering materials with fluorescence and photothermal properties through tailoring electron redistribution in Janus NPs.
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