SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Lian Xia,Feng Luo,Xiaojuan Niu,Yue Tang,Yuangen Wu
Pb(II) is a prevalent heavy metal ion classified as a 2B carcinogen. Excessive intake of Pb(II) in the human body can damage the central nervous system, kidneys, liver, and immune system, leading to permanent brain damage, anemia, and cancer. Colorimetry can be applied to rapidly determine Pb(II) residues, but there are still many challenges in the accuracy and sensitivity of detection. Based on the inhibitory impact of Pb(II) on the oxidase-like activity of octahedral silver oxide (Ag 2 O), a colorimetric sensor with smartphone-assisted analysis for the Pb(II) detection was first developed. Herein, it has been found that Pb(II) can adsorb onto the surface of octahedral Ag 2 O, hindering the production of O 2 − in the reaction system. This ultimately results in the suppression of oxidase-like activity, leading to a lighter purple appearance of the colorimetric reaction solution. The sensor exhibits a high degree of sensitivity and a limit of detection (LOD) for Pb(II) was calculated as 2.2 μg L −1 . Hence, the developed colorimetric sensor with high sensitivity, excellent specificity, and high tolerance to sodium ions is hopeful to have practical applications in Pb(II) detection in environmental water samples. Moreover, the sensor will provide a novel strategy for heavy metal ion detection and other substances.
研究领域:
环境科学
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分析化学
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毒理学
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2026
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IF 7.7
Mingliang Liu,Bohao Liu,Yong Zhang
Metal oxide semiconductor (MOS)-based carbon monoxide (CO) gas sensors are confronted with the problem of poor response at low temperature (<100°C) due to the insufficient activation energy for the reaction between gas molecules and adsorbed oxygen. Inspired by the excellent catalytic ability of silver oxide (Ag 2 O) in the oxidation of CO to carbon dioxide (CO 2 ) at low temperature and the good conductivity of metallic Ag, Ag 2 O-based sensor was rationally designed for trace-level CO detection. The as-prepared CO sensor exhibited a detection range of 0–50 ppm with a low detection limit of 0.2 ppm at 80°C. Note that an abnormal decrease trend of resistance toward CO but increase trend of resistance toward other reducing gases (such as NH 3 , H 2 S and SO 2 , etc.) was observed in the as-prepared sensor, proving the good selectivity of CO toward other common reducing gases. The primary CO sensing mechanism of the transition of Ag element from the oxidation state to the metallic state was confirmed by the ex-situ X-ray photoelectron spectroscopy. This work confirms the influence of metal element’s oxidation/metallic states conversion on the gas sensing performances from the microscopic perspective, providing new ideas for the design of CO gas sensor working at low temperature.
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Food Innovation and Advances
·
2026
·Vol. 5
·期 2
·185-194
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IF 5.4
Xiaohuan Huang,Ling Zhang,Tingshu Lu,Jie Li,Mian Wang,Wei Dai,Chengyin Zhou,Jia Xu,Yuangen Wu
Escherichia coli (E. coli) poses a grave threat to food safety, underscoring the need for expeditious and precise detection methodologies. Conventional colorimetric approaches are simple, but they frequently lack accuracy and stability. This study constructed an aptamer-based colorimetric biosensor, leveraging the enzyme-mimicking activity of octahedral Ag2O nanoparticles (NPs), mediated by oligonucleotides, aiming for highly sensitive foodborne E. coli detection. The P12-55 aptamer can be adsorbed onto the octahedral Ag2O NPs surface, thereby significantly enhancing their oxidase-mimicking activity. The aptamer enhances activity by promoting ·O2− generation, and accelerating electron transfer to the 3,3',5,5'-tetramethylbenzidine (TMB) substrate. In the presence of E. coli in the sensing system, the aptamer exhibits a preferential binding affinity for the bacteria, thereby restoring the oxidase-mimicking activity and enabling the transduction of the detection signal. The biosensor exhibited a range of linear detection of 3 × 102–3 × 108 CFU·mL−1, and the limit of detection (LOD) was as low as 4 CFU·mL−1. Recovery rates of 99.1% to 104% were achieved in milk and tap water samples, demonstrating outstanding practicality and reliability. This study proposes a novel and efficient method for the rapid detection of harmful bacteria in food, which is of significant importance for food safety assurance.
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ANALYTICAL CHEMISTRY
·
2025
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IF 6.7
Xi-Qian Sun,Yun-Feng Li,Li Chen,Hong-Bao Li,Ren-Hui Gao,Jie Liu,Tian-Yu Yang,Zheng Guo
Lithium-ion batteries (LIBs) provide many benefits, but trace electrolyte leakage can cause serious safety risks such as thermal runaway. Although gas sensors offer a potential solution, the complexity of electrolyte solvents in LIBs makes it challenging to develop sensing materials capable of universally detecting multiple solvent molecules. Here, Ag@Ag2O-functionalized SnO2 nanoflowers were synthesized using a self-template pyrolysis strategy for the sensitive detection of both common solvent molecules and widely used electrolytes. These sensors, enhanced by abundant oxygen vacancies introduced by Ag@Ag2O functionalization, exhibit excellent sensitivity, particularly to dimethyl carbonate, with a response of 106–100 ppm, a low detection limit of 11.76 ppb, and rapid response/recovery times (28/55 s) at an operating temperature of 200 °C. The sensor performance was validated by density functional theory calculations, which corroborated the effectiveness of the sensing material. In simulated LIB leakage scenarios, such as puncture and electrolyte injection, the sensors demonstrated quick responses to various common electrolyte compositions, indicating their potential for practical applications. This study highlights an effective method for fabricating composite sensing materials and emphasizes the practical significance of our universal detection approach for practical monitoring of electrolyte leakage in energy storage devices.
研究领域:
材料科学
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能源技术
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化学传感
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2018
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IF 0
Na Bi,Hanxiao Zheng,Yingming Zhu,Wei Jiang,Bin Liang
In this study, we reveal that the photodegradation of non-azo dyes using Ag 2 O as a visible-light-driven photocatalyst is accelerated by the addition of an azo dye. Upon addition of methyl orange, the time taken for the photodegradation of Rhodamine B and methylene blue was significantly shortened from 50 to 18 min and from 20 to 8 min, respectively. This acceleration is not sensitive to the type of azo dye and solution pH. The results indicate that this acceleration can be ascribed to the synergistic effect of the Ag 2 O and azo species. The intermediates of the photodegradation of the azo species over Ag 2 O have aniline-, sulfanilic-acid-, and phenol-type structures, and these species promote the photodecomposition of the non-azo organics. This acceleration has promising applications in dye wastewater photodegradation treatment.
研究领域:
环境科学
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材料科学
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DOI
JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 17
·12040-12055
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IF 2.993
Shen Jing,Xue Jinjuan,He Guangyu,Ni Jie,Chen Zixiao,Tang Bo,Zhou Zhengwei,Chen Haiqun
A novel visible-light-driven photocatalyst Bi 2 WO 6 /Ag 2 O/CQDs (BWO/Ag 2 O/CQDs), which possesses hierarchical superstructure with marigold-like appearance, was fabricated via a hydrothermal method, followed by a simple precipitation process. Ag 2 O nanoparticles sized around 25 nm and CQDs with diameters of about 10 nm were evenly deposited on Bi 2 WO 6 to form a unique heterostructure. The obtained BWO/Ag 2 O/CQDs heterostructure showed excellent adsorption and remarkably enhanced photocatalytic performance in the photodegradation of antibiotic tetracycline (TC) under visible-light irradiation compared to pristine Bi 2 WO 6 . The degradation rate of TC over BWO/Ag 2 O/CQDs photocatalyst is 16.2 times higher than that of pristine Bi 2 WO 6 and a possible mechanism for the enhanced photocatalytic performance was discussed. In addition, BWO/Ag 2 O/CQDs was applied in the selective oxidation of benzyl alcohol to benzaldehyde under visible-light illumination. The result demonstrated that the conversion rate and product selectivity are greatly improved over BWO/Ag 2 O/CQDs compared to pristine Bi 2 WO 6 in the same reaction conditions, making it a promising photocatalyst in the application of green chemical transformation. The co-coupling of CQDs and Ag 2 O with matched band potentials gives a substantial promotion for the light harvesting ability and effective separation of photogenerated charge carriers, synergistically accounting for the improvement of photocatalytic efficiency.
研究领域:
环境科学
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材料科学
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Journal of Water Process Engineering
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2024
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IF 6.3
Ahsan Nazir,Ameena Tur Rasool,Pengwei Huo,Muhammad Saqaf Jagirani
This research used a facile chemical precipitation-photoreduction technique to fabricate a plasmonic p-n heterojunction Ag@Ag 2 O-PbBiO 2 Br (A@AO-PB) photocatalysts. The resulting materials were evaluated using various characterization techniques. Levofloxacin (LEV; 100 ml, 20 mg/l) and tetracycline (TC; 100 ml, 20 mg/l) were successfully photodegraded by the optimized 10 min-A@AO-PB (50 mg) in 120 min under visible light, with efficient degradation rates of 80.6 % and 87.0 %, respectively. The increased absorption of visible light by local surface plasmon resonance (LSPR) of plasmonic Ag and the effective separation and transfer of photogenerated carriers could be the reasons for the increase in efficiency of A@AO-PB. Transient photocurrent response (TRP), electrochemical impedance spectroscopy (EIS), and photoluminescence (PL) studies have all confirmed that 10 min-A@AO-PB effectively separates and transfers photogenerated carriers. In addition, scavenger studies have shown that the dominant active species that participated in the removal of LEV and TC are h + and •O 2 − . To find intermediates, the potential photodegradation pathways of LEV and TC were also investigated through HPLC-MS. Thus, this work describes a new photocatalyst design and a desirable plasmonic photocatalyst with p-n heterojunction that can effectively degrade LEV and TC antibiotics when exposed to visible light.
研究领域:
环境科学
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材料科学
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Xiangqiang Zhan,Yue Tang,Yuanyuan Liu,Han Tao,Yuangen Wu
Although many colorimetric methods have been established for pesticide analysis, most of them rely on inhibiting catalytic activities of natural enzymes or nanozyme , easily leading to false positives in results of pesticide detection. Herein, a simple, stable, and rapid colorimetric method was firstly proposed to detect pesticide residues in vegetables based on enhancing the oxidase-mimicking activity of cube-shape Ag 2 O. The experiments, including fluorescence probe, electrochemistry , free radical tracking and enzymatic kinetics, confirmed that dimethoate could promote electron transfer from Ag 2 O to dissolved oxygen and accelerate the release of·O 2 - radicals as well as 1 O 2 , facilitating the catalytic oxidation of the chromogenic substrate. The colorimetric method exhibited satisfactory sensitivity with the limit of detection as low as 14 μg·L −1 . Moreover, such method showed excellent selectivity against other competitive pesticides, and achieved good recovery in several typical vegetables, which indicate that such strategy has a bright application prospect in the field of pesticide detection in food.
研究领域:
食品科学
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分析化学
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环境科学
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高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Yue Tang,Xiangqiang Zhan,Jia Zheng,Zhengmin Xie,Shuangju Zhu,Yuangen Wu
The long-term and excessive use of organophosphorus pesticides (OPs) leads to hazardous residues in the environment, which threatens human health to a considerable extent. Colorimetric methods can quickly and readily identify pesticide residue , but they still have various challenges in accuracy and stability. Herein, a smartphone-assisted and non-enzymatic colorimetric biosensor was constructed for rapid monitoring of multiple OPs based on the enhanced effect of aptamer on the catalytic ability of octahedral Ag 2 O. It was demonstrated that the aptamer sequence could enhance the affinity of colloidal Ag 2 O to chromogenic substrates, and accelerate the generation of oxygen radicals such as superoxide radical (·O 2 − ) and singlet oxygen ( 1 O 2 ) from dissolved oxygen, thereby significantly increasing the oxidase activity of octahedral Ag 2 O. The color change of the solution can be easily converted to the corresponding RGB values by a smartphone for quantitative and rapid detection of multiple OPs. Hence, the smartphone-based and visual biosensor of multiple OPs was acquired with limit of detection of 10 μg L −1 , 28 μg L −1 and 40 μg L −1 for isocarbophos , profenofos and omethoate , respectively. The colorimetric biosensor also exhibited good recoveries in several environmental and biological samples, showing that it may have broad application prospects for detecting OPs residues.
研究领域:
环境科学
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分析化学
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生物技术
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PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
·
IF 3.927
Xiuling Xue,Xiaoyi Chen,Xiuwen Gong
Volatile organic compounds (VOCs) can influence air quality and threaten human health; however, the development of an effective method to remediate toxic VOCs is still remain challenge. Herein, a novel silver and Ag 2 O co-doped TiO 2 with fast electron transfer modified by nitrogen doping carbon dots was prepared via a facile chemical precipitation-reduction method. Under 50 min of visible light irradiation, the novel photocatalyst exhibited approximately 50% gaseous toluene degradation efficiency, which was ca. 9.7 times and 2.2 times higher than that of bare TiO 2 and silver and Ag 2 O co-doped TiO 2 , respectively. Importantly, the photocatalyst also showed a stable structure and good recycling ability after 400 min of photocatalytic degradation with little amount of NCDs. Besides, the up-conversion effect of NCDs could emit high-energetic light and thus generate more e − -h + pairs, which could facilitate the SPR effect of Ag and thus showed strong visible light response because of the localized surface plasmon resonance (LSPR) excitation. Thus, the excellent photocatalytic performance could attribute to the synergetic effect of up-conversion effect of NCDs and SPR effect of silver which could both facilitate charge carriers separation and improve visible-light response. Finally, a possible mechanism for the excellent photocatalytic activity was proposed, in which the active species including ·O 2 − , ·OH and h + were generated and contributed to photocatalytic process. The successful fabrication of DACT provides a potential strategy for the treatment of VOCs in practical applications.
研究领域:
环境科学
·
材料科学
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