SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Lan Guo,Yuan Liu,Rongmei Kong,Guang Chen,Hao Wang,Xiuli Wang,Lian Xia,Fengli Qu
β-Glucuronidase (β-GCU) is closely related to the occurrence of multiple diseases, and it has been applied as a biomarker and therapeutic target in clinical diagnosis. However, reliable methods with high selectivity and sensitivity for monitoring β-GCU are still lacked. Herein, we designed a novel fluorescent nanoprobe, rhodamine B encapsulated MOF-5 (RhB@MOF-5) for the first time, to detect β-GCU through the synergistic effect of inner filter effect (IFE) and static quenching effect (SQE) by employing 4-nitrophenyl-β-D-glucuronide (PNPG) as the substrate. After encapsulating into MOF-5, the fluorescence emission of RhB at 550 nm excited by 320 nm was greatly enhanced. The major overlap between the fluorescence excitation spectrum of RhB@MOF-5 (about 320 nm) and the ultraviolet absorption spectrum of PNPG (about 310 nm) lead to PNPG being a good IFE absorber in this sensing system. Under the optimized conditions, the excitation spectrum of the RhB@MOF-5 could be absorbed by PNPG, resulting in the dramatically decrease of fluorescence emission. After adding β-GCU into the system, the substrate of PNPG would be enzymatic hydrolyzed to p -nitrophenol (PNP) and glucose, then the IFE disappearance and the fluorescence recovered. The current sensing platform was interference-free and exhibited a broad linearity relationship for β-GCU range of 0.1–10 U L −1 (R 2 = 0.9957) with a limit of detection as low as 0.03 U L −1 , which was reduced by more than one orders compared with the reported methods. Moreover, the encapsulation of dyes using porous nanoparticles to achieve some tailor-made characteristics will enrich experimental design inspiration.
研究领域:
生物化学
·
医学诊断
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Sensors
·
2020
·
IF 7.333
Sheng Xue,Xiao-Fang Jiang,Geng Zhang,Haiyan Wang,Zongbao Li,Xiaowen Hu,Mingyu Chen,Tianci Wang,Aiping Luo,Ho-pui Ho,Sailing He,Xiaobo Xing
For the first time, a reproducible surface plasmon-enhanced optical sensor for the detection of gaseous formaldehyde was proposed, which was fabricated by depositing a mixture of CdSe@ZnS quantum dots (QDs), fumed silica (FS), and gold nanoparticles (GNs) on the surface of a silica sphere array to meet the urgent requirement of a rapid, sensitive, and highly convenient formaldehyde detection method. Because of the spectral overlap between QDs and GNs, plasmon-enhanced fluorescence was observed in the film of QDs/FS/GNs. When exposed to formaldehyde molecules, the enhanced fluorescence was quenched linearly with the increase of formaldehyde concentration in the range of 0.5–2.0 ppm. The reason is attributed to the nonradiative electron transfer from QDs to the carbonyl of formaldehyde molecules with the assistance of amino groups. Our results demonstrate that the designed sensors are capable of detecting ultralow concentration gaseous formaldehyde at room temperature with a fast response–recovery time and excellent selectivity, stability, and reproducibility. This work provides a simple and low-cost approach for optical formaldehyde sensor fabrication and shows promising applications in environmental detection.
研究领域:
材料科学
·
环境科学
·
光学传感
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2017
·Vol. 93
·期 2
·557-568
·
IF 3.135
Fengjiao Lai,Jia Luo,Dan Jiang,Tongchao Su,Fan Zhang
BACKGROUND Because of the decline in conventional sources of energy and the increasing pollution, the fossil fuel based energy structures is being replaced by renewable energy based structures such as biomass energy. Among current biodiesel sources, methyl levulinate (ML) obtained from catalytic conversion of renewable carbohydrate with methanol has received a great deal of attention. Silica-pillared montmorillonites (MMTSi) functionalized by iron-modified tungstophosphoric acid (HPWFe) were prepared, and their physicochemical properties and catalytic effects on ML production studied. RESULTS Catalysts characterization demonstrated the high dispersion and Keggin structure of HPWFe in the framework of MMTSi. Effects of various reaction parameters and catalyst recycling on the reaction performance were studied to optimize fructose conversion. With 4-HPWFe-MMTSi as the catalyst, an optimized ML yield of around 74 mol% was obtained at 180°C for 1 h, and the recovered catalyst after calcination was found to retain high activity after being reused five times. CONCLUSION The prepared HPWFe-MMTSi catalysts showed high porosity, perfect Br nsted-Lewis acidity and high thermal stability, which made their catalytic activity for fructose conversion and catalyst reusability values higher than others reported in the literature. © 2017 Society of Chemical Industry
研究领域:
化学工程
·
可再生能源
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2018
·Vol. 51
·期 5
·055104
·
IF 2.373
Wei Wang,Da Chen,Hongfei Wang,Wenhua Yu,Maozeng Wu,Lei Yang
Trace formaldehyde vapor was detected by a micron-scale AlN film bulk acoustic resonator based on mass-sensitive mechanism. The layer-by-layer carbon nanotubes/polyethyleneimine multilayers were assembled on the resonator surface as the sensitive coating. An almost linear decrease of the resonant frequency was observed as a function of the number of nanotubes/polyethyleneimine periods. The multilayers showed a random and porous structure and thus provided a large specific surface area for gas adsorption and diffusion. At the same time, the amine groups in polyethyleneimine had an strong affinity to formaldehyde with excellent selectivity. When exposed to gaseous formaldehyde, the attachment of gas molecules induced a small decrease in the resonant frequency, which made the sensor easily detect formaldehyde at ppb levels with 1 min response time. A linear relationship was observed between the formaldehyde concentrations and the frequency downshift of the resonator. The layer number had an obvious influence on the absorption/desorption behavior of formaldehyde. The gas sensitivity of FBAR sensors was 1.29–1.90 kHz ppb−1 with the limit of detection of 24–38 ppb.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
DOI
高影响因子
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
·
2024
·
IF 2.3
Qiang Shen,Suohui Yang,Shiquan Zhang,Sheng Hu,Junguo Li,Jian Zhang
Ceramizable phenolic resin matrix composites have a significant potential for widespread applications in the field of aerospace ablation. However, due to the sharp decrease of mechanical properties at elevated temperatures, the composite fails to meet the requirements of thermal protection as well as load-bearing of aircraft in a wide temperature range. In this study, boron phenolic composites modified by MoSi2 and SiB6 with high strength in a wide temperature range are prepared. The flexural strength of composites after ablation within the temperature range of 800 °C to 1600 °C ranges from 48.07 to 82.49 MPa. In particular, a significant increase of 224.9% is obtained at 1400 °C with 6 wt% SiB6. The mass ablation rate and line ablation rate of the composites are increased to 0.054 g/s and 0.013 mm/s, respectively. The cooperation effect of oxygen consumption, carbon fixation, oxygen barrier, and liquid phase bonding produced by ceramization reactions involving SiB6, MoSi2, O2, and pyrolytic carbon at different temperatures, resulting in an improvement of the mechanical property and the oxidation resistance of the composite. These composites have a potential in long term thermal protection and load-bearing of new ablation materials.
研究领域:
航空航天材料
·
高温材料科学
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 20
·期 13
·2308743
·
IF 13.3
Hui Yang,Lu Jia,Qitao Zhang,Saisai Yuan,Teruhisa Ohno,Bin Xu
Long-term exposure to low concentration indoor VOCs of acetaldehyde (CH 3 CHO) is harmful to human health. Thus, a novel isogenous heterojunction CeO 2 /Ce-MOF photocatalyst is synthesized via a one-step hydrothermal method for the effective elimination of CH 3 CHO in this work. This CeO 2 /Ce-MOF photocatalyst performs well in CH 3 CHO removal and achieves an apparent quantum efficiency of 7.15% at 420 nm, which presents ≈6.7 and 3.4 times superior to those generated by CeO 2 and Ce-MOF, respectively. The enhanced efficiency is due to two main aspects including i) an effective photocarrier separation ability and the prolonged reaction lifetime of excitons play crucial roles and ii) the formation of an internal electric field (IEF) is sufficient to overcome the considerable exciton binding energy, and increases the exciton dissociation efficiency by up to 50.4%. Moreover, the reasonable pathways and mechanisms of CH 3 CHO degradation are determined by in situ DRIFTS analysis and simulated DFT calculations. Those results demonstrated that S-scheme heterojunction successfully increases the efficiency of harmful volatile organic compounds elimination, and it offers essential guidance for designing rare earth-based MOF photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ANALYST
·
2014
·Vol. 139
·期 14
·3614-3621
·
IF 3.906
Zhuomin Zhang,Cheng Zhao,Yunjian Ma,Gongke Li
Toxic formaldehyde is sometimes used illegally as a food preservative, however, on-site rapid analysis of trace formaldehyde in aquatic products remains a challenge. In this work, a simple on-site rapid quantification method for trace volatile formaldehyde in aquatic products was developed by a derivative reaction-based surface enhanced Raman spectroscopy (SERS) technique coupled with a homemade portable purge-sampling device. Trace formaldehyde separated from complicated aquatic matrices via a purge-sampling procedure was reacted with a derivative reagent to produce a Raman-active analyte for consequent SERS analysis. Au/SiO2 nanoparticles (NPs) were employed as the enhancement substrate to achieve significant enhancement of Raman signal intensity. Conditions of derivative reaction and SERS detection were optimized in detail, and the selectivity of this analytical method was also evaluated based on related analogs. Under optimal conditions, an extremely low detection limit of 0.17 μg L−1 was achieved. Trace volatile formaldehyde can be found in fresh squid and shrimp samples without obvious matrix interference, and this was quantified to be 0.13–0.21 mg kg−1 using the described method. The recoveries of spiked aquatic product samples were found to be 70.0–89.1% with RSDs of 2.3–7.2% (n = 3). The results suggest that the proposed method is reliable and suitable for on-site rapid analysis of trace formaldehyde in aquatic products.
研究领域:
分析化学
·
食品安全
·
光谱学
·
环境毒理学
·
食品质量控制
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 3
·1541-1552
·
IF 1.843
Zhang Zhenwei,Ma Xiaoshi,Yue Chuanjun,Wei Xuejiao,Liu Baoliang
Furfuryl ethyl ether (FEE), an important gasoline additive, is synthesized by a one-step reductive etherification of furfural (FF) by Nb 2 O 5 nanowires loaded with Pd as catalysts. Compared with other materials, the catalyst had a suitable synergistic effect between the reductive sites Pd 0 and the acidic sites of Nb 2 O 5 nanowires, effectively improving the yield of FEE. In ethanol, at 453 K and under 1 MPa H 2 pressure, the catalyst 1.0 wt% Pd/Nb 2 O 5 showed excellent catalytic performance in the reductive etherification reaction, and the yield of FEE reached 87.7%, higher than Pd/C whose yield was 81%. This result showed a feasible way to simplify the FEE preparation process, thus reducing production costs.
研究领域:
催化化学
·
绿色化学
·
纳米材料化学
·
能源化工
·
有机合成
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Hongli Yang,Huilin Hou,Yuqing Jiang,Zheng Zhang,Lin Wang,Rui Wang,Xiaoqiang Zhan,Yong Luo,Weiyou Yang
Resorcinol-formaldehyde (RF) resins have emerged as promising photocatalysts due to their unique composition of π-conjugated and π-stacked benzenoid-quinoid electron donor-acceptor (D-A) resorcinol pairs. In this study, a series of RF resin nanospheres were synthesized using a high-temperature hydrothermal method . By adjusting the hydrothermal parameters, RF resin spheres with different sizes ranging from 60 nm to 1.2 μm were successfully produced. The size of the RF resin spheres was found to have a significant impact on the photocatalytic activity for the decomposition of Rhodamine B (Rh B), an organic dye. Within a 90-min timeframe, the photodegradation efficiencies achieved were 65 %, 33 %, 21 %, and 11 % for RF resin spheres with different sizes, respectively. Notably, the smallest RF resin spheres exhibited the highest photocatalytic efficiency among the RF resin photocatalysts. This enhanced performance can be attributed to the increased exposure of abundant active sites, facilitated transfer of photogenerated charges to the catalyst surface, and improved adsorption capacity for Rh B through π-π interactions and surface hydrogen bonding networks. Based on the band structure analysis of the RF resin photocatalysts, the active species responsible for the photocatalytic degradation process were identified as hydroxyl radicals (˙OH). These radicals were predominantly generated through the multistep reduction of O 2 within the RF resin photocatalysis system under light irradiation . This research provides valuable insights into the design and development of size-controlled D-A type conjugated polymers with improved photocatalytic activity .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Ning Xiang,Yarong Bai,Qiaoyan Li,Xiaojin Han,Jianfeng Zheng,Qingsong Zhao,Yaqin Hou,Zhanggen Huang
Low-temperature HCHO oxidation over transition-metal oxide catalysts is still a ‘‘hot potato”. Herein, hierarchical hollow Co 3 O 4 @CoMn 2 O 4 nanocages (Co 3 O 4 @CoMn 2 O 4 -NCs) were designed and prepared by using ZIF-67 nanocubes (ZIF-67-NCs) engaged self-templated method. Compared with single-compositional Co 3 O 4 -NCs and solid CoMn 2 O 4 -NPs, the as-prepared Co 3 O 4 @CoMn 2 O 4 -NCs exhibited much superb HCHO oxidation performance, achieving 90% HCHO conversion at 107°C. The characterization results manifested that the special hierarchical hollow structure of Co 3 O 4 @CoMn 2 O 4 -NCs facilitated the exposure of active sites and the generation of oxygen vacancies, thereby endowing them with higher O 2 activation ability and richer reactive oxygen species (ROS). In-situ DRIFTS results suggested that richer reactive oxygen species (ROS) of hierarchical hollow Co 3 O 4 @CoMn 2 O 4 -NCs boosted the oxidation of formate species, which was the rate-determining step for HCHO oxidation. Meanwhile, the interaction of cobalt and manganese species of Co 3 O 4 @CoMn 2 O 4 -NCs enhanced their low-temperature reducibility. Eventually, benefiting from the dual merits of structure and composition, Co 3 O 4 @CoMn 2 O 4 -NCs manifested much better HCHO oxidation performance. This work demonstrates that metal-organic frameworks (MOFs)-derived mixed-metal oxides with hierarchical hollow structure possess promising application perspective for low-temperature HCHO oxidation.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Hangyu Zhong,Hongli Hu,Bo Ni,Ying Guo,Zhenhua Luo,Tong Zhao,Bo-xing Zhang
In order to improve the mechanical and thermal performance of traditional phenolic resins , nonpolar silica sol nanoparticles with different particle sizes were introduced into allyl phenolic resins with the presence of solvents. A series of allyl phenolic resins with various etherification degrees were designed and synthesized to investigate phase separation phenomenon between sol nanoparticles and allyl phenolic resins. Cured organic-inorganic hybrid samples for performance evaluation were then prepared under the pressure of 1 MPa and pressureless conditions at 250 °C, respectively. SEM observation results reveal that parameters of particle size, etherification degree, and pressure have remarkable influence on phase separation behaviors. Mechanical test and thermal stability evaluation using TGA , muffle furnace and butane torch burning tests prove that both mechanical performance and thermal stability of allyl phenolic resin could be extensively enhanced through the introduction of silica sol nanoparticles. This study provides fundamental understandings about functions and phase separation behaviors of silica sol nanoparticles in the phenolic resin matrix.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Hong Li,Qiulan Li,Qiao Shi,Yijie Wang,Xiuwei Liu,Hao Tian,Xinrui Wang,Dezhi Yang,Yaling Yang
Single-atom nanozymes (SAzymes) show distinct advantages in catalytic activity and selectivity owing to their stability and special characteristic of maximum atomic utilization. Inspired by the structure of natural horseradish peroxidase (HRP), we developed a simple method for specific determination of both propyl gallate (PG) and formaldehyde (HCHO) by utilizing the intrinsic peroxidase mimics activity of hemin (hem) loaded Zn–nitrogen–carbon single-atom nanozymes (Zn–N–C@hem SAzymes). Zn–N–C@hem was prepared via a salt-template strategy and self-assembly, where hemin exhibits enhancing peroxidase-like activity can catalyze oxidation of colorless PG to yellow product. Upon introduction of HCHO into Zn–N–C@hem/PG system, complete suppression of PG oxidation was showed, resulting in distinguished decrease in absorbance. The colorimetric sensors of PG and HCHO based on Zn–N–C@hem/PG were developed at their respective linear range of concentration 1.25–200 mg/kg and 5–250 mg/kg. The practicability of the rapid analysis of PG and HCHO in food samples has been verified with reliable results.
研究领域:
生物化学
·
食品安全
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）