Analytical Methods
·
2019
·Vol. 11
·期 22
·2868-2874
·
IF 2.378
Lifei Ji,Xian Zhou,Jian Zhang,Xin Zhang,Weidong Kang,Fengchun Yang
Organic dye detection requires high sensitivity, low-cost equipment, simplified procedures, and real-time capabilities; thus, electrochemical methods are gradually emerging in this field instead of chromatography. However, much attention has been paid to toxic and complex metal or noble-metal hybrid materials for constructing electrochemical sensors, which is extremely limiting for practical applications. In this study, a metal-free electrocatalyst, MWNTs with carboxylic groups (MWNTs–COOH), was prepared through surface oxidation in a piranha solution and a simple hydrothermal treatment. The obtained MWNTs–COOH possessed superior hydrophilicity, increased conductivity and substantial active carbon or carboxylic group sites, as determined by characterization using Raman spectroscopy, contact angle measurements, electrochemical surface area analysis, and X-ray photoelectron spectroscopy. The above advantages enabled MWNTs–COOH to exhibit excellent electrochemical activities, with a satisfactory utilization for determining trace Rhodamine B (RhB), showing a lower calculated detection limitation of 2.66 nM and a wider linear range from 0.05 to 850 μM with outstanding specificity and reproducibility. Furthermore, it was found that the carboxyl group on the MWNTs would probably have triggered the electron redistribution and exposed more adjacent active carbon sites, which facilitate the electrocatalytic function to CN on the RhB directly.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·Vol. 17
·期 12
·e202301681
·
IF 7.5
Jing Yi,Yuze Dai,Yuxuan Li,Yuhao Zhao,Yuanpeng Wu,Min Jiang,Guangyuan Zhou
Graphical A green and sustainable −COOH & −OH condensation solution polymerization method for FDCA-based polyesters. A green and sustainable −COOH & −OH condensation solution polymerization method was hereby reported for FDCA-based polyesters to avoid discoloration and toxic solvents. First, taking poly(ethylene 2,5-furandicarboxylate) (PEF) as the representative of FDCA-based polyester, enabling good white appearance PEF with M n =6.51×10 3 g mol −1 from FDCA and ethylene glycol in green solvent γ-valerolactone (GVL), catalyzed by 4-dimethylaminopyridine (DMAP) and N-(3-dimethylaminopropyl)-N’-ethylcarbodiimide hydrochloride (EDC). Additionally, the molecular weight of PEF was rapidly improved ( M n >2.5×10 4 g mol −1 ) via remelting polycondensation within minutes, with the dispersity still kept relatively low dispersity ( Đ <1.40). Importantly, the −COOH & −OH condensation solution polymerization method was successfully applied for the synthesis of various FDCA-based polyesters, including diols with varying carbon chain lengths (3 to 11 carbons) and cycloalkyl diols, especially the applicability of this method to diols containing C=C double bonds, which was found to exhibit low heat resistance. Lastly, assisting with 13 C labeled 1,4-succinic acid and in-situ 13 C-NMR, an in-depth study of the possible catalytic mechanism was proposed, by which, EDC activated FDCA, and then DMAP catalyzed it with diol to yield macromolecular chain of polyester. Overall, the results provided a green and sustainable strategy for the synthesis of FDCA-based polyesters.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 30
·10584-10593
·
IF 4
Xue Wen,Wenjun Zhang,Cong Ding,Zhongfa Li,Chengyue Xin
Metal–organic frameworks (MOFs) are a unique class of multifunctional hybrid crystals that have been successfully utilized in diverse ranges of applications. However, since MOFs are prone to aqueous degradation, the development of stable luminescent MOF platforms in aqueous media is still a huge challenge. Here, a novel dual-ligand Eu3+/DUT-52-COOH composite is prepared based on the luminescent DUT-52 prototype structure via a dual-ligand strategy and a post-synthetic modification (PSM) method. The functionalized Eu3+/DUT-52-COOH material exhibits dual emission and good photothermal stability in aqueous media. Thus, Eu3+/DUT-52-COOH is developed as a ratiometric luminescent sensor to achieve highly selective and sensitive detection of Cu2+ and Cr2O72− in aqueous solutions and has a low detection limit of 3.43 μM and 25.7 nM, respectively. This work is one of the few cases of detecting Cu2+ and Cr2O72− in aqueous media based on a DUT-52, and the detection signals can be observed by the bare eye without using sophisticated analytical instruments. The possible sensing mechanism is discussed in detail. The results obtained in this project may provide broad prospects for developing smart sensing systems to accomplish highly efficient, easily operable and quantitative intelligent recognition of Cu2+ and Cr2O72−.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Zhaoli Wang,Wenjing Li,Yi Zhang,Yanyin Cheng,Junjian Yu,Tianming Dong,Xiaoyu Chi,Di Liu,Zhe Wang
ABSTRACT Achieving high fouling resistance and permeability using membrane separation technology in water treatment processes remains a challenge. In this work, a novel mixed-matrix membrane (MMM) (poly(arylene ether ketone) [PAEK]-containing carboxyl groups [PAEK-COOH]/UiO-66-NH 2 @graphene oxide [GO]) with superb fouling resistance and high permeability was prepared by the nonsolvent-induced phase separation method, by in-situ growth of UiO-66-NH 2 on the GO layer, and by preparing hydrophilic PAEK-COOH. On the basis of the structure and performance analysis of the MMM, the maximum water flux reached 591.25 L·m −2 ·h −1 for PAEK-COOH/UiO-66-NH 2 @GO, whereas the retention rate for bovine serum albumin increased from 85.40% to 94.87%. As the loading gradually increased, the hydrophilicity of the MMMs increased, significantly enhancing their fouling resistance. The strongest anti-fouling ability observed was 94.74%, which was 2.02 times greater than that of the pure membrane. At the same time, the MMMs contained internal amide and hydrogen bonds during the preparation process, forming a cross-linked structure, which further enhanced the mechanical strength and chemical stability. In summary, the MMMs with high retention rate, strong permeability, and anti-fouling ability were successfully prepared.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 17
·8130-8137
·
IF 6.233
Jun Deng,Mingcong Sun,Jiyu Zhu,Changyou Gao
Protein adsorption influences greatly the performance of materials used in biotechnology and biomedicine. The binding of fibrinogen (Fg) to nanoparticles (NPs) can result in protein unfolding and exposure of cryptic epitopes that subsequently interact with cell surface receptors. The response and its degree are dependent on the size, charge, and concentration of the NPs. In this study the binding kinetics of human Fg to negatively charged 11-mercaptoundecanoic acid-functionalized gold nanoparticles (AuNPs–COOH) ranging from 5.6 to 64.5 nm were examined. The larger NPs bound Fg with a larger number of proteins per square unit and a higher dissociation rate (Kd′), but with decreased affinity. By contrast, the 5.6 nm AuNPs–COOH behaved in a cooperative manner for Fg adsorption. In the presence of excess Fg, only the 64.5 nm AuNPs–COOH showed severe aggregation, whose degree was alleviated in a dilute Fg solution. The Fg is adsorbed through a side-on configuration and both side-on and end-on configurations on the smaller (5.6 and 14.2 nm) and 31.5 nm AuNPs–COOH, respectively. It also retains the native conformation. By contrast, on the 64.5 nm AuNPs–COOH the Fg adopts the end-on configuration and loses most of the secondary structure.
研究领域:
生物化学
·
纳米医学
·
分子生物学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Zhijuan Wang,Ran Han,Lin Li,Jiaqing Sun,Jingying Yang,Mingfei Pan,Shuo Wang
A facile, ultra-sensitive and cost-effective electrochemical sensor was successfully prepared by combining metal–organic framework ZIF-8 with MWCNTs-COOH, which detecting of tert -butylhydroquinone (TBHQ) in edible oil and fried foods. The hydrothermally synthesized ZIF-8 material with microporous structure was demonstrated to have large specific surface area, and together with the MWCNTs-COOH with high electrical conductivity and catalytic properties, was used as a modified substrate for electrodes. Because of the synergistic effect between ZIF-8 and MWCNTs-COOH, the modified electrode exhibited significant electrocatalytic ability for TBHQ. Under the optimal experimental conditions, the ZIF-8/MWCNTs-COOH modified electrode obtained good linearity when the TBHQ concentration ranged from 0.01 to 25.0 μg mL −1 with the LOD (limit of detection) of 0.009 μg mL −1 (S/N = 3). Moreover, the constructed electrochemical sensor exhibits better anti-interference capability, reproducibility and stability, and can be used to monitor the content of TBHQ in oil and fried foods.
研究领域:
分析化学
·
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Healthcare Materials
·
2023
·
IF 10
Lei Chen,Xiaomei Wang,Mengping Chen,Qiwen Sun,Yemeng Chen,Xiaojie Zhang,Rui Hong,Yigong Xu,Jingwen Guan,Sheng Hong,Dehan Cao,Tingfeng Sun,Ximeng Li,Lanhua Chen,Juan Diwu
The limited availability of effective agents for removing actinides from the lungs significantly restricts the effectiveness of medical treatments for nuclear emergencies. Inhalation is the primary route of internal contamination in 44.3% of actinide-related accidents, leading to the accumulation of radionuclides in the lungs and resulting in infections and potential tumor formation (tumorigenesis). This study focuses on the synthesis of a nanometal−organic framework (nMOF) material called ZIF-71-COOH, which is achieved by post-synthetic carboxyl functionalization of ZIF-71. The material demonstrates high and selective adsorption of uranyl, while also exhibiting increased particle size (≈2100 nm) when it aggregates in the blood, enabling passive targeting of the lungs through mechanical filtration. This unique property facilitates the rapid enrichment and selective recognition of uranyl, making nano ZIF-71-COOH highly effective in removing uranyl from the lungs. The findings of this study highlight the potential of self-aggregated nMOFs as a promising drug delivery system for targeted uranium decorporation in the lungs.
研究领域:
放射医学
·
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Huihui Liang,Mengli Xu,Yongmei Zhu,Linyu Wang,Yi Xie,Yonghai Song,Li Wang
A uniform nanosphere derived from ferrocence-modified covalent-organic frameworks (COFETTA-TPAL-Fc(COOH)2) with 200 nm in diameter was prepared by dehydration condensation reaction between 4,4′,4′,4′- (ethane-1,1,2,2-tetrayl) tetraaniline and terephthalaldehyde in the presence of electroactive Fc(COOH)2. The Fc(COOH)2 was embedded into the layers of COFETTA-TPAL to result in the formation of nanospheres, which increased the specific surface area of the available COFETTA-TPAL to provide more active sites due to the increase in interlayer distance. The Fc(COOH)2 could interact with H2O2 which might undergo self-disproportionation process to produce O2 and be reduced into H2O simultaneously, whereas the generated O2 was directly reduced into H2O by COFETTA-TPAL. The reduction peak current of the generated O2 at −0.5 V (j–0.5 V) was gradually enhanced, whereas that of Fc(COOH)2 around 0.45 V (j0.45 V) was decreased with continuous adding of H2O2. Thus, the COFETTA-TPAL-Fc(COOH)2 nanospheres were used to fabricate a “on–off” nonenzymatic H2O2 ratiometric electrochemical sensor. The proposed “on–off” ratiometric electrochemical sensor showed good performance with a wide linear range of 1.1–500 μM, high sensitivity of 0.009 μM–1, and lower detection limit of 0.33 μM. The work would offer insights for design and preparation of electroactive COF and accelerate the practical application of COF in electroanalysis.
研究领域:
材料科学
·
电化学
·
分析化学
✓ 已验证
产品关联
DOI
Analytical Methods
·
2023
·Vol. 15
·期 21
·2693-2699
·
IF 3.1
Jianghua Chen,Yuanshuai Zang,Mengyi Chen,Chen Shi,Manlei Zhang,Bin Di,Cheng Jiang
As the dangers of cannabis abuse draw attention worldwide, it is necessary to assess the level of consumption in the community. The analysis of 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THC-COOH) excreted in wastewater can provide information for a defined catchment area. Due to its hydrophobic nature and absence of ionizable groups, its detection is challenging. In this study, a highly sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the quantitative determination of THC-COOH in urban wastewater. The derivatization reagent 6-methylpyridine-3-sulfonyl chloride (MPS) with analyte-specific fragmentation was proven to be the most effective for improving sensitivity. Samples were extracted by solid-phase extraction (SPE) and satisfactory recovery was achieved (>79%) by adding acetonitrile to the samples for ultrasonic-assisted extraction before filtration. The limit of detection (LOD) and limit of quantification (LOQ) was 0.03 ng L−1 and 0.1 ng L−1, respectively, from a 40 mL sample. The established methodology was applied to profile the presence of THC-COOH in influent wastewater samples. It was shown that 20 out of the 252 samples contained THC-COOH and the concentrations were all below 1 ng L−1.
研究领域:
环境科学
·
分析化学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of CO2 Utilization
·
2023
·
IF 7.7
Weiting Yu,Sizhuo Chen,Jieyun Zhu,Zhiqiao He,Shuang Song
Electrochemical CO 2 reduction reaction (CO 2 RR) towards CO is considered as one of the most promising routes to alleviate carbon emissions and achieve a carbon-neutral cycle. In this work, a highly dispersed Ag-BTC catalyst (BTC refers to the 1,3,5-benzenetricarboxylate ligand) with abundant catalytically active sites has been synthesized via a facile one-step hydrothermal method. Efficient, highly selective, and stable electrochemical reduction of CO 2 into CO has been achieved on the Ag-BTC electrocatalyst. The faradaic efficiency of CO production from the CO 2 RR is around 95%, which is within the range of highest values reported to date. A correlation between the structure of the Ag-BTC electrode and its enhanced catalytic performance has been established through the combination of characterization results and electrochemical measurements. Furthermore, a lower Gibbs free energy change (∆G) for the rate-determining step regarding the formation of intermediate COOH ads also leads to the superior catalytic performance of CO 2 RR on Ag-BTC.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Shuting Shi,Chuanqin Zhou,Aiting Chen,Nana Tang,Kun Wan,Youwei Jiang,Jun Liu,Quanguo He,Li Cao
Antibiotics have emerged as a class of contaminants of concern globally, raising widespread worry and unease, primarily because of their inappropriately use and endless migration in food chains. Electrochemical ultrasensitive and selective determination of norfloxacin (NOR) using bismuth-based bimetallic salt bismuth molybdate (Bi 2 MoO 6 ) and carboxylated multi-walled carbon nanotube (MWCNTs-COOH) hybrid electrode as sensing platforms is presented hereby. The electrocatalytic ability of the electrodes was verified to be enhanced by the synergy effect of both Bi 2 MoO 6 and MWCNTs-COOH using cyclic voltammetry and electrochemical impedance spectroscopy. Linear scan voltammetry was applied to detect NOR. The oxidation peak current was linearly correlated with NOR concentration of 0.03–10 μM and the low limit detection of the optimized method was 6.7 nM (S/N = 3). In addition, it was verified that Bi 2 MoO 6 /MWCNTs-COOH/GCE probe had good stability, reproducibility, repeatability and selectivity. The spiked recovery method for NOR in milk and lake water samples showed recoveries of 94.8 – 96.9% and 90.2 – 98.3%, respectively, which can be used to determine NOR in real samples with high sensitivity. The preparation of Bi 2 MoO 6 /MWCNTs-COOH/GCE provides a new prototype for probing NOR detection at nanomolar concentration and safeguarding antibiotic contamination in environmental and food chains.
研究领域:
环境科学
·
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Na Liu,Youwei Jiang,Quanguo He,Tao Zhang,Yao Ping,Yelong Jiang,Wu Wang,Qijun Xie,Jianhua Ding
As an oral prodrug, valacyclovir undergoes rapid in vivo hydrolysis to form acyclovir - an agent with antiviral properties. This compound is extensively employed in addressing herpes virus infections and various other related conditions. Therefore, there is an urgent need to develop a method for detecting the content of valacyclovir in drugs. In this study, molybdenum disulfide (MoS 2 ) and carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) were ultrasonically dispersed to prepare a suspension, which was drop-coated on the surface of a pretreated glassy carbon electrode (GCE). A MoS 2 /MWCNTs-COOH/GCE sensing platform was successfully constructed for the ultrasensitive detection of valacyclovir. Under optimized conditions, cyclic voltammetry (CV) was used to detect valacyclovir. A strong linear correlation between the oxidation peak current and the concentration was observed within the range of 0.1–40.0 μM, with a detection limit (LOD) of 0.013 μM. Meanwhile, the sensing platform also demonstrated excellent anti-interference capability, stability, and reproducibility. In the analysis of real samples, satisfactory recoveries for valacyclovir (96.5–104.0%) were achieved with a relative standard deviation (RSD) below 5.0%, further confirming its reliability. In summary, the developed MoS 2 /MWCNTs-COOH/GCE sensor offers a promising approach for the highly sensitive detection of valacyclovir.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）