Journal of Ocean University of China
·
2023
·Vol. 22
·期 2
·469-478
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IF 1.6
Mei Xueqiao,Li Chunhu
Photocatalyst Ag/ZnO-TiO 2 was prepared by template method. The catalyst was characterized by XRD, SEM, and UV-vis DRS. Rhodamine B (RhB) and target pollutants were used to evaluate the photocatalytic performance of the catalyst under 40 W UV-lamp. The photocatalytic degradation mechanism of Rhodamine B was discussed through free radical quenching experiment. The experimental results show that hexagonal ZnO-TiO 2 can be successfully prepared by template method, and nano Ag particles are evenly loaded on the catalyst. Under the reaction conditions of 1% catalyst input and 40 W UV-lamp, the catalytic degradation rate of RhB by Ag/ZnO-TiO 2 was 98.28%. The photocatalytic degradation mechanism of Ag/ZnO-TiO 2 was explored by free radical quenching experiment. The experimental results show that H + and ·OH play a major role in the photocatalytic degradation of RhB by Ag/ZnO-TiO 2 .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiaqi Hu,Fangyuan Chen,Jie Mao,Linjie Ni,Jinfeng Lu
Molecular oxygen activation is essential to the photocatalytic oxidation reaction, which is highly dependent on the construction of active sites and efficient charge transfer of photocatalysts. In this study, we constructed Bi 4 V 2 O 11 /Ag/AgCl Z-type heterojunction photocatalysts with significantly enhanced molecular oxygen activation capacity. The systematic characterization and analysis including X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations confirmed that the formation of efficient Z-type heterostructure could be attributed to the introduction of Ag nanoparticles (NPs), which regulated the electron transfer direction from Bi 4 V 2 O 11 to AgCl. Owing to the advantage of enhanced charge transfer efficiency, the O 2 − generation capacity of Bi 4 V 2 O11/Ag/AgCl Z-scheme heterojunction was as high as 4.6 times that of pure Bi 4 V 2 O 11 . Consequently, Bi 4 V 2 O 11 /Ag/AgCl showed good degradation performance against tetracycline (TC), ciprofloxacin (CIP), ranitidine hydrochloride (RAN) and 2,4-dichlorophenoxyacetic acid (2,4-D) under visible light, and their degradation rates were 8.2 times, 5.9 times, 3.8 times and 11.9 times higher than those of Bi 4 V 2 O 11 , respectively. This study provides an effective and feasible strategy to design photocatalyst with improved molecular oxygen activation efficiency.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Dechan Lu,Rongyuan Cai,Yuqin Liao,Ruiyun You,Yudong Lu
Abnormal uric acid (UA) content in body fluids can fully reflect the status of metabolism and immunity in the body. We have developed a simple, efficient and label-free surface enhanced Raman scattering (SERS) method for UA detection. Briefly, p-aminothiophenol (p-ATP) was used as the internal standard molecule and linking molecule to prepare a glass/p-ATP/Ag NPs SERS substrate. The Raman characteristic peak of p-ATP at 1076 cm −1 can be used as an internal standard molecule to correct the signal fluctuation of UA detection. The results show that the SERS method owns a linear response with a ranging from 5 × 10 -6 to 10 -3 M of UA characteristic peak of both 693 cm −1 and 493 cm −1 with a determination coefficient (R 2 ) of 0.9878 and 0.9649, respectively. Additionally, the SERS sensor has been further used for the analysis of UA in sweat and good recoveries were obtained for the sensing of sweat. We believe that the developed SERS substrate has potential for applications in healthcare monitoring.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xiaoyu Zhong,Linyang Li,Wenhao Xiang,Chuanbao Xiao,Nianbing Zhong,Quanhua Xie,Dengjie Zhong,Yunlan Xu,Haixing Chang,Shih-Hsin Ho
Herein, a highly stable and efficient photoelectrocatalytic system was developed for the rapid degradation of tetracycline . The photoelectrocatalytic system comprised two Ag/N-doped TiO 2 nanotube photoanodes, a bipolar membrane, and a P–Pd cathode. The Ag/N-doped TiO 2 nanotube photoanodes were coupled with a P–Pd cathode to enhance the hydroxyl free radical (·OH) generation at the cathode surface. The bipolar membrane can separate tetracycline pollutants and degradation products from the photoanodes, which can minimize the contamination of the photocatalyst by tetracycline or products, thereby enhancing the repeatability and stability of the photoelectrocatalytic system. photoelectrocatalytic uses ultraviolet–visible light as the input energy for the effective removal of tetracycline and total organic carbon . The initial pH in the cathode and photoanode chambers was 7.0. The Na 2 SO 4 concentration in the photoanode chamber and the addition amount of H 2 O 2 were 0.2 M and 4% (v/v), respectively. Under these conditions, 100 mL of 100 mg/L tetracycline was completely degraded within 60 min, and 82.3% total organic carbon was removed within 5 h. The pseudo-first-order reaction rate constant of the Ag/N-doped TiO 2 nanotube with 0.15 M Ag was 0.0637 min-1, which was 12 times higher than that of N-doped TiO 2 nanotube. The mechanisms underlying·OH generation and the tetracycline degradation pathway were also elucidated. The photoelectrocatalytic system, which is an eco-friendly and low-energy system, exhibits excellent stability and reliability toward tetracycline and total organic carbon degradation and significantly aids the development of wastewater remediation.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Wen-Juan Gong,Hua-Rui Nan,Hong-Bo Peng,You-Qun Wang,Zhi-Min Dong,Zhi-Bin Zhang,Xiao-Hong Cao,Yun-Hai Liu
In this study, we prepared a new ratiometric fluorescent sensor by first encapsulating blue-fluorescent carbon dots (B-CDs) with SiO 2 , coupling gold nanoclusters (GSH-AuNCs) to the surface, and finally anchoring a layer of Ag + . The presence of UO 2 2+ caused fluorescence quenching of the ratiometric fluorescent probe when used in aqueous solutions. Furthermore, HOMO–LUMO orbital analysis suggested that the quenching mechanism was mainly attributed to photoinduced electron transfer (PET) between B-CDs@SiO 2 @GSH-AuNCs/Ag + and UO 2 2+ . Under optimal conditions, the ratiometric fluorescent probes exhibited excellent selectivity and detected UO 2 2+ at 37 nmol/L. This new “on–off” ratiometric fluorescent sensor exhibits promising potential for convenient monitoring of UO 2 2+ levels with ideal recovery in real-world water samples.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Zhiqiang Zhou,Jianfang Cen,Naijia Jiang,Yu Sun,Zhouyang Li,Liyun Yang
With the widespread application of Ag + in modern life and industry, the potential hazardous effects of Ag + to environment and humans have attracted great concerns. Thus, effective and rapid strategies for Ag + detection are highly desirable. In this paper, a novel ratiometric fluorescence sensor using CdSe quantum dots (QDs) has been constructed for sensitive and selective detection of Ag + , which is based on the formation of Ag 2 Se QDs. CdSe QDs were initially prepared and showed single wavelength emission at 510 nm. When Ag + exists, a rising peak appeared at 650 nm and the emission at 510 nm declined, exhibiting distinct ratiometric fluorescence emission ( I 650 / I 510 ) characteristic with a linear response over the Ag + concentration range of 0.01–4 μM. Significantly, the fluorescence changed from green to red. The detection limit of the constructed sensor is 1.4 nM. Furthermore, the sensing assay can be successfully applied to detect Ag + in real water samples and living cells.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
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IF 4.831
Xuejiao Wang,Xupeng Zhu,Yufeng Tao,Erjin Zhang,Xudong Ren
Pesticide residues threaten the ecological environment and human health. Therefore, developing high performance SERS substrate to achieve highly sensitive detection of pesticide residues is meaningful. In this study, based on the strategy of combining “hot spots” engineering and material hybridization, we construct a novel hybrid SERS substrate by depositing Ag nanoflowers (NFs) on ZnO nanorods (NRs). Benefiting from the synergistic effect of electromagnetic enhancement and charge transfer effect, the Ag NFs@ZnO NRs substrate exhibits a low detection limit (10 −13 M) for crystal violet molecules. This SERS substrate has good uniformity with a relative standard deviation of 7.463 %. Besides, owning to the photocatalytic property of ZnO NRs, the hybrid substrate can degrade probe molecules after SERS detection and realize recyclability. As a demonstration, we employed our SERS substrate for the trace detection of pesticide residues on apple surface and in river water. This study provides a new idea for improving the SERS performance of hybrid substrates.
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Food Analytical Methods
·
2019
·Vol. 12
·期 9
·2094-2105
·
IF 2.413
Yaseen Tehseen,Pu Hongbin,Sun Da-Wen
The sensitivity of surface-enhanced Raman spectroscopy (SERS) extremely relies on experimental parameters including pH and aggregating agents. Using Au@Ag nanoparticles (NPs) with 26 nm Au core size and 6 nm Ag shell thickness as the substrate, the effect of cationic (Ca 2+ , K + , Na + ) and anionic (Cl − , Br − ) aggregating agents was investigated on the SERS detection of phosalone. The optimum concentrations of the aggregating agents in relation to the maximum SERS intensity differed broadly from 1 × 10 −2 mol/L for CaBr 2 to 1 × 10 1 mol/L for KCl. Both anions and cations greatly affected the SERS enhancement. With employing Br − as the anion, Ca 2+ and K + showed the maximum SERS intensities for phosalone, while using Ca 2+ as the cation, Br − produced the maximum SERS enhancement. Among these aggregating agent combinations, the maximum SERS enhancement was achieved by employing 1 × 10 −2 mol/L CaBr 2 at pH 3.0. The detection limits of phosalone in standard solution and peach were 0.02 mg/L and 0.2 mg/kg, respectively. This study demonstrated that the Au@Ag NP-based SERS approach could be used as a sensitive, rapid, and simple method for detecting trace contaminants in food matrices.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Jiahuan An,Guohan Sun,Haian Xia
An efficient method for the catalytic aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 5-hydroxymethyl-2-furancarboxylic acid (HMFCA) was developed using size-controlled Ag nanoparticles (NPs) in an aqueous solution. A series of AgNPs catalysts stabilized by poly(vinylpyrrolidone) (PVP) supported on ZrO2with different Ag loadings were prepared. XRD, TEM, XPS, and FT-IR techniques were used to characterize the nature of these catalysts. The impact of the Ag loading, the molar ratio of PVP to Ag, the reaction temperature and time, and the base type on the conversion of HMF and yield of HMFCA was investigated. The reaction results show that Ag–PVP/ZrO2 catalysts with a bigger particle size (>10 nm) exhibited superior catalytic activity and HMFCA selectivity compared to Ag/ZrO2 with a smaller particle size (ca. 8.5 nm), indicating that the addition of PVP has a promoting effect on the aerobic oxidation of HMF into HMFCA. The 2.5%Ag–PVP/ZrO2(1:1) catalyst presents an excellent activity with 100% conversion of HMF and 98.2% yield of HMFCA in oxygen flow at 20 °C for 2 h.The basicity is also very critical to obtain a high HMFCA yield, especially for the use of high concentration of HMF; i.e., Ca(OH)2 afforded a higher selectivity toward HMFCA compared to the use of NaOH or Na2CO3 under an identical reaction condition. It is revealed for the first time that the presence of a capping agent (PVP) can effectively modulate the metal–support interaction. Interestingly, it is found that the relatively weak interaction between Ag NPs and the ZrO2 support has a beneficial effect on the conversion of HMF. This work provides new insights into the relationship between the metal–support interaction mediated by PVP molecule and the activity and selectivity of the oxidation reaction.
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CATALYSIS TODAY
·
2019
·
IF 4.888
Qiong Liu,Ertao Liu,Ju Li,Yuan Qiu,Rong Chen
Spindle-like Ag/ZnO nanostructure has been successfully synthesized via an ultrasonic-microwave combined assisted method. The as-prepared Ag/ZnO nanocomposites exhibited enhanced photodegradation efficiency for organic pollutants than pure ZnO and commercial TiO 2 (P25) under visible light irradiation, which was probably due to the surface plasmon resonance (SPR) effect of Ag nanoparticles . The production of hydroxyl radicals ( OH) under visible light irradiation was greatly promoted via loading Ag nanoparticles on the surface of ZnO nanostructures, also resulting in the improved photocatalytic activity. Moreover, the spindle-like Ag/ZnO nanocomposites displayed excellent antibacterial activities for both Gram-positive and Gram-negative bacteria. The Ag/ZnO nanocomposites could penetrate and damage cell membrane, causing the leakage of cytosol and the inactivation of respiratory chain dehydrogenase. The synergistic effect of Ag and ZnO is also beneficial for the mass production of H 2 O 2 , leading to the enhanced antibacterial activities of nanocomposites.
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ACS Biomaterials Science & Engineering
·
2019
·
IF 4.511
Shilei Wang,Qiaomu Huang,Xiangyu Liu,Zhao Li,Hao Yang,Zhong Lu
The integration of nanomaterials with clinical therapeutic instruments is a promising approach to improve the effects of nanomaterials. We reported an efficient synergistic antibacterial strategy formed through the combination of Ag/ZnO nanocomposites with a light-emitting diode (LED) curing light, which is a commonly used small instrument in dental clinics. The as-designed integration depicted a significantly enhanced bactericidal effect on facultative anaerobic oral pathogen Streptococcus mutans (S. mutans) both in planktonic and biofilm phases over a very short irradiation time (≤5 min). Further study showed that the combination of LED and Ag/ZnO nanocomposites induced more ·OH and ·O2– generation, which is responsible for the enhanced antibacterial activity. Moreover, this combination could destroy S. mutans biofilm by killing the bacteria embedded within biofilm, inhibiting exopolysaccharide production and down-regulating the biofilm-related gene expression. Therefore, it is proposed that this combination could be applied in dental clinics to realize dental caries prevention and dental restoration simultaneously.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Xia Zhou,Guangqiang Liu,Hongwen Zhang,Yue Li,Weiping Cai
A core–shell configuration of the zeolite imidazole framework (ZIF-8) wrapped urchin-like Au-Ag alloyed nanocrystals (UAANs) were designed and fabricated via adding the pre-formed plasmonic nanoparticles into the ZIF-8 precursor solution with hexadecyltrimethyl ammonium bromide (CTAB). The UAANs are about 100 nm in size with high-density tips. The ZIF-8 shell layer is nanoporous and can be controlled in thickness from 10 nm to 40 nm by the CTAB concentration. Importantly, such ZIF-8 wrapped UAANs can be used as the highly efficient surface enhanced Raman scattering (SERS) substrates for detection of the trace hexachlorocyclohexane (HCH) molecules. The ZIF-8 shell layer with an appropriate thickness (-∼20 nm) can evidently increase the SERS performance of the UAANs to the trace γ-HCH and α-HCH. Such wrapping-enhanced SERS effect significantly increases, by a power function, with the decreasing HCH concentration, especially in the concentration below 10 −6 M, which is attributed to the ever-increasing enrichment effect to the HCH molecules. The detection limit is down below 1.5 ppb. This work presents a highly efficient substrate for the SERS-based detection of the trace HCH, and also displays the potential application in the SERS detection of volatile small molecules.
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