TALANTA
·
2020
·
IF 5.339
Libo Li,Bainian Chen,Lijun Luo,Xiaohong Liu,Xiaoya Bi,Tianyan You
In the present study, a novel self-enhanced electrochemiluminescence (ECL) aptasensor which combined self-enhanced ECL composite as signal response element and aptamer as the specific recognition element was firstly proposed for the sensitive and selective detection of Hg 2+ . Innovatively, the luminophore Ru(bpy) 3 2+ -doped silica nanoparticles functionalized with 3-aminopropyltriethoxysilane (NH 2 – [email protected] 2 ) and the co-reactant nitrogen doped graphene quantum dots (NGQDs) were bound together to form the self-enhanced ECL composite, NH 2 – [email protected] 2 -NGQDs, by electrostatic adsorption. Satisfactorily, high and stable luminous efficiency of NH 2 – [email protected] 2 -NGQDs was obtained benefited from the short electron transfer distance and low energy loss of self-enhanced-typal ECL composite. For the fabrication of the self-enhanced ECL aptasensor for Hg 2+ detection, the Hg 2+ aptamer, of which one end was connected to NH 2 – [email protected] 2 -NGQDs, and the other end was fixed on glass carbon electrode (GCE) surface through Au–S bond, was served as a bridge. Upon the addition of Hg 2+ , the aptamer was bent due to the formation of thymine-Hg 2+ -thymine (T-Hg 2+ -T) specific structure, which caused the self-enhanced ECL composite was close to the GCE surface. On this basis, a linearly enhanced ECL signal was acquired with the concentration of Hg 2+ in the range of 5.0 × 10 −11 M − 1.0 × 10 −6 M with excellent selectivity , repeatability and stability in 3 min for each assay. In addition, the proposed aptasensor showed satisfying accuracy and practicability for Hg 2+ analysis in tap and canal water verified by the inductively coupled plasma-mass spectrometry (ICP-MS) method.
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高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 22
·2872-2880
·
IF 2.596
Yahui Wang,Meng Yan,Qianqian Ji,Manman Wang,Qian Wang,Xuesheng Wang,Yulan Hao
In this work, a magnetic material (Fe3O4-NH2@MIL-101) was successfully prepared, and the material was used as a sorbent for the magnetic solid-phase extraction (MSPE) of trace level monohydroxy polycyclic aromatic hydrocarbons (OH-PAHs) from urine samples for the first time. The target analytes were quantified by high performance liquid chromatography coupled with fluorescence detection (HPLC-FLD). The MSPE key factors, which include the amount of adsorbent, extraction time, pH, the effect of salt, eluting solutions and eluant volume, were systematically optimized. Under the optimized conditions, the developed method showed good linearity (0.03–200 ng mL−1), low limits of detection (0.016–0.042 ng mL−1, signal-to-noise ratio = 3) and satisfactory repeatability (relative standard deviation ≤ 10.1%, n = 5). The method showed stable average recoveries ranging from 78.3% to 112.9% and the enrichment factors were 9 to 15. Besides the satisfactory method parameters, the total MPSE process could be completed in no more than 5 minutes. These results indicated that Fe3O4-NH2@MOF based MSPE was a simple, efficient and fast method which was suitable for MSPE of OH-PAHs from urine samples.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Wen Cao,Yuhang Yuan,Cao Yang,Shichuan Wu,Jianhua Cheng
For the first time, visible-light-driven g-C 3 N 4 /MIL-68(In)-NH 2 heterojunction composites with high photocatalytic activity were prepared for the degradation of ibuprofen (IBP) using an in-situ solvothermal synthesis method assisted with ultrasonication. The composites achieved intensive visible-light absorption, enhanced separation efficiency of photogenerated carriers, and high adsorption capacity, thus achieving excellent photocatalytic degradation for IBP. Among all the composites, 10 wt% g-C 3 N 4 /MIL-68(In)-NH 2 exhibited the maximum photocatalytic rate (0.01739 min −1 ), 19.28 and 2.00 times higher than those of g-C 3 N 4 and MIL-68(In)-NH 2 , respectively. Moreover, the pH, ibuprofen concentration, and catalyst dosages played important roles both in photodegradation and adsorption. In addition, the photocatalytic mechanism was also elucidated, demonstrating that h + was the main reactive species, followed by OH and O 2 − radicals, responsible for the degradation of IBP. Finally, seven aromatic intermediates of IBP were identified, and five possible degradation pathways were proposed, mainly involving hydroxylation, aldehyde oxidation, decarboxylation, and dehydrogenization reactions.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Lili Zhang,Yuefeng Huang,Jiaqing Zhang,Enqing Zhu,Jinxia Ma,Zhiguo Wang
A combination of multiple methods can greatly intensify the removal efficiency of hazardous substances. Herein, the synergistic utilization of adsorption and catalysis achieved for the highly efficient removal of hexavalent chromium (Cr 6+ ). A paper-based palladium nanoparticles/UiO-66-NH 2 (PdNPs/UiO-66-NH 2 /LP) composite catalyst was prepared using lignocellulose paper-based material (LP) for the loading of UiO-66-NH 2 MOFs materials, with the lignin in LP as the reducer for the in-situ synthesis of PdNPs (12.3 nm) on UiO-66-NH 2 MOF materials. Lignocellulose paper-based materials with high strength (82 N·m/g) realized low-cost and environmentally friendly preparation and guaranteed the practicability of PdNPs/UiO-66-NH 2 /LP composite catalyst. The prepared PdNPs/UiO-66-NH 2 /LP achieved high-efficiency catalytic activity for hazardous Cr 6+ removal through a constructed adsorption-catalytic synergistic system, in which the removal efficiency of Cr 6+ in 10 min was increased by 2 times compared with a composite catalyst without MOFs loading. Finally, the PdNPs/UiO-66-NH 2 /LP composite catalyst demonstrated the great efficiency and practicality of water pollution treatment through synergistic adsorption enrichment and catalytic reduction.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Qing Yang,Chenghui Li,Jing Hu,Xiandeng Hou
Background Selenium is an indispensable microelement for humans and food is the main source of selenium intake. As one of the best techniques for the determination of selenium, inductive coupling plasma-mass spectrometry (ICP-MS) features some unique advantages, such as wide linear range and high sensitivity. Nevertheless, it still remains a challenge to achieve the accurate and high sensitivity determination of ultra-trace selenium in food samples by ICP-MS owning to the high first ionization energy of selenium and interferences from sample matrices as well as isobaric interferences. Results In this work, UiO-66-NH 2 (metal organic framework, MOF) was fast synthesized by microwave method and employed for the preconcentration of ultra-trace selenium with an adsorption efficiency of nearly 100 %. The selenium-adsorbed MOF was collected by filtration, and then simply converted to slurry for in situ hydride generation (HG) for sensitive detection of selenium by ICP-MS. Various factors affecting the adsorption of selenium by the MOF (including pH, adsorption time, and amount of MOF) together with main parameters of hydride generation (including concentrations of HCl and NaBH 4 ) were carefully evaluated. Experimental results show that effective matrix separation can greatly reduce interference, with an excellent detection limit of 1 ng/L. The practicability and accuracy of this method were successfully confirmed by the determination of trace selenium in several food samples. Significance UiO-66-NH 2 (MOF) was used as an effective adsorbent for the preconcentration of selenium prior to direct slurry sampling HG-ICP-MS determination. Direct slurry sampling avoided additional elution procedures and was conducive to eliminating matrix and isobaric interferences. High sensitivity and interference-free determination were achieved for determination of ultra-trace Se in complex food samples.
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高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 10
·1-11
·
IF 5.7
Tian Jiangman,Zhu Qihao,Huang Xiaojing,Li Yuan
A novel sandwich-type “on-off” electrochemiluminescence (ECL) biosensor for the determination of α(2,3)-sial-Gs was designed. Specifically, amino-functionalized porous silica nanoparticles (HPSNs-NH 2 ) were first prepared and then decorated with gold nanoparticles (Au NPs) to form HPSNs-NH 2 @Au NP nanocomposite, which exhibited a strong ability to enhance ECL intensity with K 2 S 2 O 8 as co-reactant (signal-on) and could immobilize the target-specific binding molecules of maackia amurensis lectin (MAL). Additionally, AuPdPt trimetallic nanoparticles were prepared to serve as a quenched ECL signal indicator (signal-off) with the ability of capturing the target non-specific binding molecules of 3-aminophenylboronic acid (APBA) to form a signal label. The sandwich-type ECL biosensor was constructed based on the structure of MAL-α(2,3)-sial-Gs-APBA and achieved a determination toward α(2,3)-sial-Gs with a wide linear range from 1 fg mL −1 to 10 ng mL −1 and a low detection limit of 0.5 fg mL −1 . Furthermore, the proposed ECL biosensor showed satisfactory selectivity, stability, and reproducibility for α(2,3)-sial-Gs determination. Graphical Abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ming Fang,Zhenfei Yang,Yang Guo,Xinnian Xia,Shuaijun Pan
The internal electric field induced by piezoelectric effect can optimize the transport pathway of photogenerated charge in photocatalysis. We constructed an effcient piezoelectric photocatalytic heterojunction UiO-66-NH 2 @CdS and achieved a shift in the charge transfer mechanism through the piezoelectric effect, resulting in excellent photocatalytic H 2 evolution performance. The optimal heterojunction under the ultrasonic environment exhibited 2028.48 μmol·g −1 ·h −1 photocatalytic H 2 evolution performance, roughly four times better than no-ultrasound condition. Because of the piezoelectric polarization of UiO-66-NH 2 , the photogenerated carrier transport mechanism was changed from type Ⅱ to the more favorable Z-scheme for charge separation. Meanwhile, the built-in electric field caused by the piezoelectric effect can act as a powerful driving force for charge separation, achieving high charge separation efficiency and promoting the utilization of photogenerated electrons. This work would provide a fresh perspective for MOF-based piezoelectric photocatalysts and have implications for the design of efficient Z-scheme heterojunctions.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 31
·14828-14839
·
IF 3.3
Lin Dong,Yunlan Xu,Dengjie Zhong,Nianbing Zhong,Zhuofan Han,Yi Liu,Haixing Chang
The low electron–hole separation in the photoanode generally restricts the visible light response of photocatalytic fuel cell (PFCs). In this study, 5% NH2-MIL-125/g-C3N4/Bi2O3/Ti photoanode was synthesized and assembled with a PFC with Cu cathode to degrade rhodamine B and generate electricity. With visible light irritation, the maximum photocurrent density, maximum power density, and degradation rate of the PFC were 0.59 mA cm−2, 29.88 μW cm−2, and 97.48% (1 h), respectively. The major active species in the PFC were h+, ˙O2−, and ˙OH. The good performance of the PFC was ascribed to the formation of a double Z-type heterojunction in the 5% NH2-MIL-125/g-C3N4/Bi2O3/Ti photoanode so that the photoelectrons of NH2-MIL-125 and Bi2O3 directly combine with the photoholes of g-C3N4, making the photoholes of NH2-MIL-125 and Bi2O3 and the photoelectrons of g-C3N4 directly or indirectly involved in the RhB degradation process and generating electricity. Thus, the separation rate of the e−–h+ pairs in the photoanode and the capability of the PFC are greatly improved.
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DESALINATION
·
2023
·
IF 9.9
Chuqing Cao,Fengnan Liu,Fangqing Li,Onyeagoro Robinson Uzochukwu,Lin Chen
Membrane distillation (MD) is a promising desalination technology that combines traditional distillation processes with membrane separation technology , but when the feed solution contains amphiphilic substances such as surfactant, the hydrophobic membrane is prone to being wetting, which hinders its widespread application. In this study, a novel Janus membrane was developed by embedding Zr-MOF and silver nanowires into the modified graphene oxide composite membrane to improve its separation performance, and the effect of high-concentration SDS on the membrane performance was studied. The experimental results showed that the conductive membrane exhibited excellent performance when powered on for 5 min every 2.5 h under 2 V voltage. The flux stabilized at 19.6 L/(m 2 h) with a desalination rate up to 99.9 % and no obvious signs of membrane wetting. It was found that the effect of electric field caused a negative charge on the membrane surface , forming a charge repulsion force with the SDS. Simultaneously, intermittent electrical flotation can effectively remove SDS that has accumulated on the membrane surface, thus achieving efficient and stable operation of MD system. Moreover, a machine learning approach with Catboost was applied to predict and unveil the complex effects on membrane performance, providing a deep insight to treat wastewater containing surfactant.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Zongyan Lu,Hao Guo,Xiaoqin Wei,Lei Sun,Zhilan Pan,Bingqing Liu,Yinsheng Liu,Jiaxi Xu,Jiaying Tian,Wu Yang
In this article, a novel and simple electrochemical sensing platform has been developed for the simultaneous and sensitive determination of acetaminophen (ACOP) and 4-aminophenol (4-AP). The porous covalent organic frameworks (COFs) material with β-ketoenamine-linkage was successfully synthesized via 1,3,5-triformylphloroglucinol (TFP) and 2,6-diaminoanthraquinone (DAAQ) and named as TFP-DAAQ-COF. High conductivity walnut shells-derived carbon (WC), amine-functionalized multi-walled carbon nanotubes (NH 2 -MWCNTs) with multiple active sites and TFP-DAAQ-COF were combined to obtain composite materials, which were used to modify bare glass carbon electrodes (GCE) and realize the electrochemical analysis of ACOP and 4-AP. The experiments showed that the composite electrode had a strong synergistic effect and exhibited a good electrocatalytic oxidation ability for the two target analytes. The linearity ranges of ACOP and 4-AP were 0.5 ∼ 200 μM and 1.0 ∼ 250 μM, respectively and the detection limits (S/N = 3) were 0.12 μM and 0.18 μM. In addition, the sensor showed acceptable reproducibility, stability and excellent selectivity. The recovery was satisfactory, when it was used to analyze the contents of ACOP and 4-AP in real samples, indicating that the sensor was feasible in practical applications.
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Analytical Methods
·
2023
·Vol. 15
·期 21
·2622-2630
·
IF 3.1
Liangyun Yu,Liangju Sun,Qi Zhang,Jingjing Zhang,Bairen Yang,Mingquan Huang,Yawen Zhou,Baocai Xu,Xiaoya Hu
This study developed an electrochemical sensor for the determination of Mn2+ in Chinese liquor by modifying a glass carbon electrode with TiO2-NH2@COFDPTB, which was synthesized via the controllable growth of COFDPTB onto the surface of TiO2-NH2 using the Schiff-base condensation reaction between 2,5-dimethoxyterephthalaldehyde and 1,3,5-tris(4-aminophenyl)benzene. The morphological and structural characterization studies of the proposed TiO2-NH2@COFDPTB were carried out by SEM, TEM, HRTEM, EDX, BET, XRD and FTIR techniques. Owing to the excellent properties and the synergism between TiO2 and COFDPTB, the introduction of TiO2-NH2@COFDPTB improved the electrochemical response significantly. By optimizing the experimental parameters, the sensor exhibited good linearity in the range of 0.1–1.0 nM and 0.08–10 μM with a detection limit of 2.83 × 10−11 M and 9.50 × 10−9 M, respectively, showing competitive performance for Mn2+ determination. Besides, the proposed sensor was successfully applied to Mn2+ detection in liquor samples, suggesting its practical application performance.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Baofang Zhang,Ziyu Zengcai,Wenting Lin,Meijin Zhang,Yunhong Pi,Tiejun Wang
Photothermal synergism can effectively activate methanol at low operating temperature and significantly reduce the activation energy of the reaction, achieving more efficiently H 2 release from methanol reforming. Here, a novel hierarchical heterojunction that integrating photo- and thermal-active Cu 2 O catalytic species with in-situ derived NH 2 -MIL-125@TiO 2 framework was specifically designed for photothermal-driven aqueous phase reforming of methanol into H 2 . The afforded Cu 2 O/NH 2 -MIL-125@TiO 2 realized an outstanding photothermal H 2 production activity (apparent quantum efficiency of 22.3 % at 365 nm), ca. 13-times higher than that of thermocatalytic condition. Interestingly, the photothermal effect did confer the Cu 2 O/NH 2 -MIL-125@TiO 2 with unexpected activity at low temperature subsided to 100 °C and accelerated the activation of MeOH/H 2 O with an obvious reduction of activation energy from 82.62 kJ·mol −1 to 52.40 kJ·mol −1 . The improvement of catalyst stability and the promotion of charge separation also contributed to a long-term photothermal H 2 evolution activity with average rate of 1.49x10 6 μmolg Cu -1 h −1 and a total turnover number (TON) up to 5971 in 63 h, almost 125-fold promotion compared with Cu 2 O.
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