SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
IF 4.831
Yuzhu Zhai,Yijing Li,Xiaoke Huang,Juying Hou,Houshen Li,Shiyun Ai
A colorimetric and ratiometric fluorescent dual-mode assay is constructed for sensitive and specific Hg 2+ sensing based on UiO-66-NH 2 and Au composite (UiO-66-NH 2 @Au). The addition of Hg 2+ stimulates the peroxidase-like activity of UiO-66-NH 2 @Au by the formation of Au-Hg amalgam, promoting the oxidizing of chromogenic substrate OPD to DAP with the aid of H 2 O 2 , which lead to the change of colorimetric and fluorescent signals. The absorbance of the sensing system at 450 nm is linear positive correlation with Hg 2+ concentration of 30–1400 nM and the color of the solution under visible light shaded from light yellow to dark yellow. With the increase of Hg 2+ concentration, the fluorescence signal at 570 nm (DAP) increased whereas that at 455 nm (intrinsic fluorescence of UiO-66-NH 2 ) decreased due to inner filter effect (IFE), the fluorescence intensity ratio (F 455 /F 570 ) decreasing linearly with Log [Hg 2+ ] over the range 60–1700 nM; the fluorescence emission of sensing system under UV excitation changed from blue to yellow, which can easily be discerned visually. This assay was successfully applied to the determination of Hg 2+ in tap water and river water. The results indicate that the colorimetric and ratiometric fluorescent dual-mode assay based on UiO-66-NH 2 @Au realized visual determination of Hg 2+ rapidly and reliably, revealed application prospect in Hg 2+ monitoring.
研究领域:
分析化学
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环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Guoxiang Yang,Longyang Wang,Chencheng Zhang,Ping Li,Hao Du,Yanjie Mao,Mengyi Qiu,Qiang Li,Derek Hao,Qi Wang
Bacterial infection threatens human health, so the design of efficient and stable photocatalytic antibacterial materials has attracted widespread attention. In this regard, a novel photocatalyst GQDs/NH 2 -MIL-125 (GQDs: graphene quantum dots) was prepared by the solvothermal method for photocatalytic disinfection. Since the addition of GQDs enhanced the absorption of visible light and also accelerated the transfer of photogenerated electrons, the photocatalytic performance of GQDs/NH 2 -MIL-125 was significantly improved. 5 wt% GQDs loading sample (2-GQDs/NH 2 -MIL-125) exhibited the best antibacterial properties. The killing efficiency by 2-GQDs/NH 2 -MIL-125 against E. coli and S. aureus (10 7 CFU·mL −1 ) increased from 40 % and 75 % by NH 2 -MIL-125 to 92 % and 93 % within 60 min, respectively. Moreover, through the single-wavelength antibacterial experiments, it was found that the introduction of GQDs led to a wide-range-responsive antibacterial effect. Through photocatalytic trapping experiments and ESR analysis, the dominant roles of superoxide radicals (•O 2 – ) were confirmed in the antibacterial process. Finally, by studying the state of bacteria via TEM, confocal fluorescent images, and gel electrophoresis, it was found that the active substances not only destroyed the cell membranes but also further destroyed DNA to achieve the purpose of completely killing bacteria. This work provides a new method for the rapid disinfection of pathogenic microorganisms using GQDs-related photocatalysts.
研究领域:
材料科学
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微生物学
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环境科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 41
·93877-93891
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IF 5.8
Zhang Xiaoting,Han Xiaoyu,Liu Yang,Han Runping,Wang Rong,Qu Lingbo
One green adsorbent, UiO-66-NH 2 modified peanut shell (c-PS-MOF), was prepared in a green synthetic route for improving the capture level of aspirin (ASP) and fluoride ion (F – ). The adsorption properties of c-PS-MOF were evaluated by batch experiments and its physicochemical properties were explored by various characterization methods. The results showed that c-PS-MOF exhibited a wide range of pH applications (ASP: 2–10; F – : 3–12) and high salt resistance in the capturing processes of ASP and F – . The unit adsorption capacity of c-PS-MOF was as high as 84.7 mg·g –1 for ASP as pH = 3 and 11.2 mg·g –1 for F – under pH = 6 at 303 K from Langmuir model, respectively. When the solid–liquid ratio was 2 g·L –1 , the content of ASP ( C 0 = 100 mg·L –1 ) and F – ( C 0 = 20 mg·L –1 ) in solution can be reduced to 0.48 mg·L –1 and 1.05 mg·L –1 separately. The recycling of c-PS-MOF can be realized with 5 mmol·L –1 NaOH as eluent. Analysis of simulated water samples showed that c-PS-MOF could be used to remove ASP and F – from actual water. The c-PS-MOF is promising to bind ASP and F – from rivers, lakes, etc. Graphical Abstract
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Ping Lu,Huaifang Li,Mantian Li,Jie Chen,Changshen Ye,Hongxing Wang,Ting Qiu
In this work, acidic ionic liquid (AIL) was grafted into NH 2 -UiO-66 through acid-base interaction. And the novel heterogeneous catalyst x AIL@NH 2 -UiO-66 ( x means the mass ratio of AIL to NH 2 -UiO-66) was first applied in the field of biodiesel production. The optimal catalyst 3AIL@NH 2 -UiO-66 with good wettability (with reactants) and high acidity was prepared successfully. Accordingly, the 3AIL@NH 2 -UiO-66 can be widely applied in biodiesel production from different raw materials. The conversion of free fatty acids (FFAs) in esterification was above 90%, as well as the biodiesel yield in transesterification was above 80%, showing excellent catalytic activities of 3AIL@NH 2 -UiO-66. And the 3AIL@NH 2 -UiO-66 also revealed excellent reusability, with the conversion of oleic acid decreases from 96.86% to 90.42% after 6 runs. In addition, the interaction between any two of the three factors (catalyst dosage, reaction time and molar ratio) on the oleic acid conversion was revealed with 3D response surface technology. By the mechanism investigation, the good wettability with reactants and high acidity of the catalysts are identified as key factors for biodiesel production. The method of anchoring ionic liquids with organic linkers for the application of MOFs in biodiesel production offers abundant possibilities.
研究领域:
化学工程
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催化材料
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可再生能源
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DOI
高影响因子
Sustainability
·
2023
·Vol. 15
·期 18
·13382
·
IF 3.9
Qihang Dai,Ju Liu,Junjie Zheng,Bo Fu
Metal–organic frameworks (MOFs) hold great potential for efficient removal of particulate matter (PM) due to their high porosity and tunable surface groups. In this work, sustainable bacterial cellulose (BC) was employed as a substrate for Zr-based MOF (i.e., UiO-66-NH2) deposition. Specifically, the UiO-66-NH2@BC aerogel exhibits a multi-level pore structure with a specific surface area of 103 m2/g. Pristine BC aerogels indicated a removal efficiency of 50.6% for PM2.5, with a pressure drop of 22.8 Pa. While UiO-66-NH2@BC aerogels showed a PM2.5removal efficiency of 96.9%. The filtration mechanism can be assigned to the following reasons: (i) the interception/impaction of PM with the fibrous and porous aerogel network; and (ii) the presence of polar amine groups that boost electrostatic interactions between PM and MOFs. Moreover, as-prepared filters can be regenerated in a facile way with good reusability and long-term stability.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Jiali Liu,Xianbiao Wang,Yangyang Zhao,Yongfei Xu,Yang Pan,Shaojie Feng,Jin Liu,Xianhuai Huang,Huanting Wang
Radioactive U(VI) in nuclear wastewater is a global environmental pollutant that poses a great threat to human health. Therefore, it is of great significance to develop a U(VI) sensor with desirable sensitivity and selectivity. Inspired by electron-donating group modification for enhancement of binding affinity toward U(VI), we report an amine group functionalization of UiO-66-NH2, using a low-cost, environmentally friendly, and low-temperature NH3 plasma technique as a fluorescence switching nanoprobe for highly sensitive and selective detection of U(VI). The resulting amine-functionalized UiO-66-NH2 (LTP@UiO-66-NH2) shows dramatically enhanced fluorescence emission and selective sensitivity for U(VI) on the basis of the quenching effect. The quenching efficiency increases from 58 to 80% with the same U(VI) concentration (17.63 μM) after NH3 plasma functionalization. As a result, the LTP@UiO-66-NH2 has the best Ksv (1.81 × 105 M–1, 298 K) and among the lowest LODs (0.08 μM, 19.04 ppb) compared with those reported in the literature. Intraday and interday precision and application in real environment experiments indicate stable and accurate U(VI) detection performance. Fluorescence lifetime and temperature-dependent detection experiments reveal that the quenching mechanism belongs to the static quenching interaction. The highly selective fluorescence detection is attributed to the selective binding of U(VI) by the rich functionalized amine groups of LTP@UiO-66-NH2. This work provides an efficient fluorescence probe for highly sensitive U(VI) detection in water, and a new strategy of tailored plasma functionalization for developing a practical MOF sensor platform for enhanced fluorescence emission, sensitivity, and selectivity for detecting trace amounts of radioactive species in the environment.
研究领域:
环境科学
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材料科学
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放射化学
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DOI
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 48
·5830-5837
·
IF 2.896
Shouhui Chen,Jingguo Yu,Zhen Chen,Zhenzhong Huang,Yonghai Song
The presence of Cd2+, Pb2+, Cu2+ and Hg2+ in drinking-water can be harmful to human health, even if their concentration is fairly low. Hence, it is significant to detect these heavy metal ions in sewage to evaluate the quality of water. Herein, amino-functionalized metal–organic frameworks (NH2-MIL-88(Fe)) embedded with graphitic carbon nitride (g-C3N4) nanosheets and acid-functionalized carbon nanotubes were prepared via a one-pot synthesis. The composite can be directly modified on the surface of glass carbon electrodes without the assistance of Nafion or other binders. The modified glass carbon electrodes can be used to simultaneously detect Cd2+, Pb2+, Cu2+ and Hg2+ in water via square wave stripping voltammetry. The doping of g-C3N4 in the composite, rich in N-containing functional groups, participates in the adsorption of metal ions on the surface of the electrodes. The porous composite provides accommodation room for metals generated by electro-reduction. The detection limit for Cd2+, Pb2+, Cu2+ and Hg2+ is 39.6 nM, 7.6 nM, 11.9 nM, and 9.6 nM, respectively. And the sensitivity for Cd2+, Pb2+, Cu2+ and Hg2+ is 0.0789 mA μM−1 cm−2, 0.4122 mA μM−1 cm−2, 0.2616 mA μM−1 cm−2, and 0.3251 mA μM−1 cm−2, respectively. This work not only enriches the functional design of Fe-MOF materials, but also develops a method for the determination of metal ions using the adsorption sites in g-C3N4.
研究领域:
环境科学
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材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhenyuan Xu,Dongzhi Zhang,Zheng Li,Chen Du,Yan Yang,Bao Zhang,Wenhao Zhao
Flexible wearable sensors to monitor human movement and for electronic skins must exhibit high sensitivity, a wide detection range, and waterproof characteristics. This work reports a flexible, highly sensitive, and waterproof sponge pressure sensor (SMCM). The sensor is made by assembling SiO2 (S), MXene (M), and NH2-CNTs (C) on the backbone of melamine sponge (M). The SMCM sensor exhibits excellent sensitivity (10.8 kPa–1), an ultra-short response/recovery time (40 ms/60 ms), a wide detection range (30 kPa), and an extremely low detection limit (4.6 Pa). Benefiting from layer-by-layer self-assembly, the sensor still exhibits excellent stability after 5000 cycles. In addition, the SMCM sensor also has excellent waterproof performance (a water contact angle of 142°), enabling it to operate unaffectedly under wet conditions. The SMCM sensor can accurately detect small body movements such as pulse and swallowing while also accurately detecting finger and elbow movements. In addition, the sensor can be designed as an array to construct an electronic skin for detecting the magnitude and distribution of external pressure. This work holds great application potential in next-generation electronic skin, fitness detection, and flexible pressure sensors.
研究领域:
材料科学
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生物医学工程
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传感器技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Qin Zhang,Lijiao Fan,Wenbin Liu,Yuming Xie,Jiangang Li,Guolin Huang
The core–shell structure UiO-66-NH 2 @Ni-MOF was prepared by in-diffusion growth of 2D Ni-MOF on UiO-66-NH 2 using PVP (polyvinylpyrrolidone) as a structural guide. It was applied to the adsorption of U(VI) in aqueous solution. The materials were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometer (EDS). The UiO-66-NH 2 @Ni-MOF adsorption to U(VI) was investigated experimentally. The study showed that the adsorption of U(VI) onto UiO-66-NH 2 @Ni-MOF was endothermic and spontaneous. At pH 5.00 and 308 K, the adsorption capacity was 581.40 mg/g according to Langmuir model. In addition, the adsorption process can be described by the pseudo-second-order kinetic model. The adsorption capacity was kept at 83.83% of its original one after five sorption–desorption cycles, a promising indication for repetitive usage.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 10
·1-6
·
IF 2.175
Zhang Ying,Chen Yu,Zhang Yupeng,Cong Huahua,Fu Bo,Wen Shanpeng,Ruan Shengping
A novel porous nanosized humidity-sensing material of amine-functionalized titanium metal organic framework (MOF), NH 2 -MIL-125(Ti), was investigated. NH 2 -MIL-125(Ti) nanoparticles with high phase purity and good physicochemical property were synthesized by a simple hydrothermal method. The nanosized MOF was characterized by X-ray diffraction and scanning electron microscope. The average size of the MOF nanoparticles is around 300 nm. Then NH 2 -MIL-125(Ti) humidity sensor was fabricated by coating the nanosized materials on interdigitated electrodes. The humidity sensor based on NH 2 -MIL-125(Ti) shows good linearity of RH (11–95 % RH), as well as fast response and recovery time. The RH detecting range is from 11 to 95 % RH at 100 Hz. The response and recovery time are about 45 and 50 s, respectively. Moreover, the sensing mechanism was discussed by complex impedance analysis in detail. These results indicate the potential application of NH 2 -MIL-125(Ti) in humidity sensors.
研究领域:
生物医学工程
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材料科学
·
传感器技术
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2012
·Vol. 64
·期 2
·347-357
·
IF 1.632
Zhang Jian-Ming,Zhai Shang-Ru,Zhai Bin,An Qing-Da,Tian Ge
Multifunctional nanomaterials with task-specific physicochemical properties, especially core–shell nanostructures with Fe 3 O 4 core and NH 2 -functional shells (Fe 3 O 4 @SiO 2 –NH 2 ), have been extensively investigated as high-performance adsorbents, catalysts and catalyst supports; and in most cases the controllable sol–gel technique is the choice for fabrication of this kind of widely applied materials. Herein, we demonstrated that mono-dispersed and spherical Fe 3 O 4 @SiO 2 –NH 2 nanomaterials with magnetic response core, NH 2 -functional shell structure can be facilely prepared by co-condensation of TEOS with APTMS using a versatile sol–gel process. It was shown that the proper usage of APTMS and appropriate pre-hydrolysis time of TEOS were crucial and key steps for formation of highly uniform and desirable amino loading Fe 3 O 4 @SiO 2 –NH 2 materials. The TEOS pre-hydrolysis and the critical time (around 90 min) before the addition of APTMS prove to be vital for uniform structure evolution, while the appropriate concentration of APTMS (~2.28 mmol L −1 in our system) leads to well-dispersed materials with relatively high loading of amino functionality. The as-prepared Fe 3 O 4 @SiO 2 –NH 2 magnetic nanoparticles prepared under optimum conditions possessing superparamagnetic behavior, uniform core–shell structure (~200 nm in diameter), relatively large BET surface area (~138 m 2 /g) and high incorporation of amino-functionality (~2.90 wt %).
研究领域:
材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xudong Wu,Kaifu Yu,Yizhou He,Xin Cao,Tao Chen,Wenkun Zhu
The phenomenon of rapid migration of photogenerated charges in natural photosynthetic systems has motivated the design of efficient photocatalysts capable of fast charge separation and efficient reaction kinetics for photocatalytically assisted enrichment and separation of uranium U(VI) in uranium wastewater. In this study, we developed a biomimetic photocatalytic system MnOx/NH2-UiO-66-rGO (M/UiO-rGO) with spatially separated dual cocatalysts. Among them, rGO functions to capture electrons and participates in reduction reactions, while MnOx captures holes and participates in oxidation reactions. The M/UiO-rGO catalyst exhibits excellent performance in photocatalytic reduction of uranium (reaching 91.8% in 1 h), and even under natural light conditions, it exhibits excellent uranium removal ability (80.4%). Using multispectral coupling technology, we further confirmed that enriched uranium undergoes a continuous and complex reaction process of “capture-reduction-free radical oxidation–nucleation–crystallization”. This work presents a viable strategy for designing biomimetic photocatalysts with efficient charge separation and rapid reaction kinetics for environmental purification purposes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）