SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yimin Huang,Dafeng Zhang,Hongguang Cheng,Yingnan He,Guangzhi Hu
The global community is facing the dual problem of water eutrophication and a shortage of phosphate rock resources. In this study, carboxylated ZnAl-hydroxide-modified biochar (LDH/PMA/BC) was synthesised to remove and recover phosphorus (P) from water through highly selective adsorption and desorption of P. The results of adsorption experiments indicated that LDH/PMA/BC has an high removal rate for low concentrations of P, and the maximum capacity for adsorption of P was 109 mg g −1 . Furthermore, when a low concentration of P coexisted with a high concentration of competitive ions, LDH/PMA/BC could selectively adsorb P through hydrogen bonding, and its removal rate for P reached 99 %–100 % of its removal rate without competitive ions. In addition, LDH/PMA/BC maintained 85 %–93 % of its initial adsorption capacity in 10 adsorption–desorption cycles, and the P recovery rate reached 95 %. These results indicate the potential of LDH/PMA/BC as an adsorbent for removing and recovering P from wastewater.
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
高影响因子
MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Shan Luo,Yuanyuan Wang,Xianwen Kan
Ratiometric electrochemical sensing provides a new perspective for the accurate and reliable detection of different analytes since inner reference signal can effectively eliminate the internal and external interferences. There is still a challenge to explore new inner references for the development of ratiometric electrochemical sensing. Herein, a kind of redox-active metal-organic frameworks (Cu-THQ MOFs) was synthesized and characterized by scanning electron microscope, transmission electron microscope, X-ray powder diffractometer, and X-ray photoelectron spectroscopy techniques. Cu-THQ MOFs were composited with carboxylic group functionalized multi-walled carbon nantubes (MWCNTs-COOH) to construct a sensitive electrochemical sensor. The modified Cu-THQ MOFs not only showed good catalytic active to dopamine (DA), but also displayed the constant peak current with the increase of concentration of DA. And a separated oxidation peak potential of about 270 mV between DA and Cu-THQ MOFs can be observed. Accordingly, a current ratio ( i DA /i MOFs ) was employed as readout signal for DA detection with a linear range and limit of detection of 3.0 × 10 −7 – 4.0 × 10 −5 mol/L and 2.6 × 10 −8 mol/L, respectively. Compared with single signal of i DA , ratiometric strategy exhibited high accuracy and reliability for DA determination. The present ratiometric sensing strategy using MOFs as the inner reference may provide a new choice for future development of electrochemical sensors for other analytes reliable determination.
研究领域:
分析化学
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材料科学
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生物医学
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产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2023
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IF 4.1
Yixuan Fan,Runze Yu,Geoffrey I.N. Waterhouse,Ruiqiang Wang,Yufeng Sun,Zhixiang Xu
BACKGROUND Biogenic amines (BAs) in high concentrations are toxic and may cause a series of health symptoms. A sensitive measurement of BA levels is essential for human health. Capillary electrophoresis (CE) has emerged for the separation of eight BAs due to simple sample preparation and highly efficient separation. However, an important drawback for CE is low sensitivity. Magnetic solid-phase extraction (MSPE) has become a technique of interest owing to its brief operation and low solvent consumption. Hence, MSPE as a pretreatment has great potential to improve CE sensitivity for the analysis of BAs in complex food. RESULTS Results showed that the Pt-Co-MWCNTs-COOH possessed strong magnetism, good reusability, and high adsorptive ability toward eight biogenic amines based on the hydrogen bonding between the −COOH of Pt-Co-MWCNTs-COOH and −NH 2 groups of BAs. Using it as an adsorbent, a magnetic solid-phase extraction coupled with capillary electrophoresis (MSPE-CE) method was developed to effectively extract and sensitively analyze eight BAs. Under optimal conditions, the MSPE-CE method has wide linearities (10.0–1000.0 μg L −1 ) and low limits of detection (1.0–6.1 μg L −1 ). The accuracy of the developed method yielded recovery values from 82.07% to 102.58%. Meanwhile, the BAs contents in two samples were analyzed using the MSPE-CE method, with the results consistent with those detected by a high-performance liquid chromatography method. CONCLUSION Given those advantages, the established MSPE-CE method promises the practical guidance of monitoring a variety of BAs and provides a foundation for the detection of other food hazards. © 2023 Society of Chemical Industry.
研究领域:
分析化学
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食品科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2025
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IF 4.3
Chengyu Sun,Yihao Ji,Wenyan Huang,Fuli Deng,Yi Zhang
The recovery of rare earth elements from mineral wastes is extremely critical for the soaring global demand due to their unique roles and resource scarcity. In this work, the defective phosphoric acid functionalized UiO-66-COOH (UiO-66-COOH-OP-ST2) was prepared via the successive phosphoric acid functionalization and defect modulation procedures towards UiO-66-COOH. The adsorption results disclosed that maximal adsorption capacities of UiO-66-COOH-OP-ST2 and phosphoric acid functionalized UiO-66-COOH (UiO-66-COOH-OP) were found to be 132.76 and 83.11 mg/g at pH = 6, respectively. Adsorption kinetics curves and isotherms revealed that the adsorption process was consistent with pseudo second order kinetic model and Langmuir isothermal model. Furthermore, UiO-66-COOH-OP-ST2 can maintain 91.74 % of initial adsorption capacity after five consecutive adsorption–desorption cycles, and exhibit no significant changes in the XRD patterns, demonstrating an excellent recycling stability. In addition, the adsorption mechanism elucidated that the elevated adsorption performance was mainly attributed to the electrostatic attraction and complex interaction between the O sites and Yb(III) based on EDS and XPS analysis. This work efficiently improved adsorption performance of metal organic frameworks after simultaneously grafting functional groups and creating defective sites without affecting their stabilities.
研究领域:
环境化学
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材料科学
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无机化学
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吸附分离
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稀土元素回收
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产品关联
DOI
高影响因子
Science Bulletin
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2020
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IF 9.511
Dong-Rui Yang,Ling Liu,Qian Zhang,Yi Shi,Yue Zhou,Chungen Liu,Feng-Bin Wang,Xing-Hua Xia
Electrochemical conversion of CO 2 into fuels is a promising means to solve greenhouse effect and recycle chemical energy. However, the CO 2 reduction reaction (CO 2 RR) is limited by the high overpotential, slow kinetics and the accompanied side reaction of hydrogen evolution reaction. Au nanocatalysts exhibit high activity and selectivity toward the reduction of CO 2 into CO. Here, we explore the Faradaic efficiency (FE) of CO 2 RR catalyzed by 50 nm gold colloid and trisoctahedron. It is found that the maximum FE for CO formation on Au trisoctahedron reaches 88.80% at −0.6 V, which is 1.5 times as high as that on Au colloids (59.04% at −0.7 V). The particle-size effect of Au trisoctahedron has also been investigated, showing that the FE for CO decreases almost linearly to 62.13% when the particle diameter increases to 100 nm. The X-ray diffraction characterizations together with the computational hydrogen electrode (CHE) analyses reveal that the (2 2 1) facets on Au trisoctahedron are more feasible than the (1 1 1) facets on Au colloids in stabilizing the critical intermediate COOH*, which are responsible for the higher FE and lower overpotential observed on Au trisoctahedron.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Meng Yang,Hao Guo,Lei Sun,Ning Wu,Mingyue Wang,Fan Yang,Tingting Zhang,Junye Zhang,Zhilan Pan,Wu Yang
In this present work, a carboxylated multi-walled carbon nanotubes (MWCNT-COOH) and covalent triazine framework (CTF-1) co-modified glassy carbon electrode (GCE) is prepared and used for simultaneous electrochemical detection of hydroquinone (HQ) and catechol (CC). Due to the synergistic effect between the high electrocatalytic activity and good conductivity of MWCNT-COOH and large surface area of CTF-1, the prepared modified electrode exhibits good selectivity and high sensitivity for the simultaneous determination of HQ and CC. In the neutral phosphate buffer, HQ and CC produce a pair of well-defined redox peaks on the MWCNT-COOH/CTF-1/GCE. The concentrations of CC and HQ show good linearity in the range of 2–280 μM and the detection limits of HQ and CC are 0.12 μM and 0.17 μM, respectively. The prepared electrochemical sensor can be employed to determine contents of HQ and CC in real samples.
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
高影响因子
IONICS
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2017
·Vol. 23
·期 9
·2377-2385
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IF 2.062
Pan Guangxing,Song Yonghai,Miao Longfei,Wang Li
A novel ascorbic acid (AA) electrochemical biosensor based on ferrocene dicarboxylic acid (Fc(COOH) 2 )/zeolitic imidazolate framework-8 (ZIF-8)/three-dimensional (3D) kenaf stem-derived macroporous carbon (3D-KSCs) was proposed for the first time. The formation and properties of Fc(COOH) 2 /ZIF-8/3D-KCSs nanocomposites were characterized by scanning electron microscopy, Fourier transform-infrared spectroscopy, N 2 adsorption/desorption isotherms, X-ray powder diffraction, and energy dispersive X-ray spectroscopy. The results showed that a large number of short rod-like ZIF-8/Fc(COOH) 2 was arrayed on the 3D-KSCs surface via a simple one-step hydrothermal method. Fc(COOH) 2 was firmly encapsulated into the pores of ZIF-8 simultaneously during the synthesis process of ZIF-8. The Fc(COOH) 2 /ZIF-8/3D-KCSs nanocomposites were employed to prepare integrated Fc(COOH) 2 /ZIF-8/3D-KSCs electrode directly for electrochemical AA sensing, and the integrated electrode showed better performance for AA detection than traditional enzyme-based biosensors and nonenzymatic sensors. A wide detection range of 0.06 μM~5.01 mM and a low detection limit of 0.017 μM were obtained with good stability and selectivity. The work also sheds new light on developing ZIF-8-based nanocomposites for electrochemical sensing.
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研究领域:
材料科学
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分析化学
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生物传感
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2025
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IF 6.5
Jia Li,Yang Li,Yingshan Zeng,Yang Liu,Zhengguo Song,Zhi Liu
CO 2 photo reduction provides a feasible technique to solve climate issues and promote carbon neutrality. However, the efficiency of CO 2 photo reduction is severely depressed by the rapid recombination of photo generated carriers within photo catalysts, restricting the participation of electrons in the reduction process. In this study, we successfully construct a two-dimensional (2D) multilayer internal electric field (IEF) heterostructure by engineering the interface between NiAl-LDH and ZnV 2 O 6 (ZNA). Driven by the IEF, the separation of photo generated electron-hole pairs is significantly enhanced, leading to the increased utilization efficiency of carriers for active sites. The best-performing sample of ZNA-2 achieves a highest CO yield of 695.8 μmol g −1 , approximately 30.5-fold higher than that of pristine ZnV 2 O 6 . Photo electrochemical measurement and density functional theory (DFT) calculation results reveal that the 2D-2D stacked structure generates multiple interlayer built-in electric fields, which are crucial for enhancing carrier separation and suppressing recombination. Adsorption energy and intermediate COOH* analysis reveal that ZNA-2 significantly lowers the adsorption energy of CO 2 , promoting its stable adsorption and subsequent conversion. Moreover, the unique 2D multilayer IEF heterostructure greatly facilitates the formation of key intermediate COOH* and the desorption of CO during CO 2 photo reduction, leading to high CO activity and selectivity. The present work discloses the unprecedented potential of 2D multilayer IEF heterostructures for efficient CO 2 photo reduction, marking a significant advancement over conventional 2D counterparts.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
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2021
·Vol. 11
·期 10
·3422-3427
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IF 6.119
Yuqing Shao,Xinkui Wang,Zhaolin Dou,Xiaoyu Liang,Xinxin Zhang,Min Pang,Qiang Xu,Min Ji,Min Wang
Solar-driven CO2 conversion into fuels and sustainable energy has attracted increasing attention around the world. However, the efficiency of the transformation remains relatively low due to the rapid recombination of photogenerated charge carriers. In this work, we prepared a ZnIn2S4–ZnAlOx nanocomposite for visible light driven CO2 reduction. The thin layered structure facilitated the photoinduced charge carrier separation and transfer, and also gave excellent adsorption ability towards CO2 molecules. Such a nanocatalyst exhibited excellent activity in visible-light driven CO2 reduction with a CO optimal formation rate of 1100 μmol g−1 h−1, which is 5 times that over bulk ZnIn2S4, and the CO/H2 ratio was increased from 0.2 over bulk ZnIn2S4 to 1.5 over the ZnIn2S4–ZnAlOx composite. In situ FT-IR experiments indicated that CO2 was reduced on ZnIn2S4–ZnAlOx following a COOH* pathway. This work gives insights into the mechanism of the photocatalytic CO2 reduction reaction and inspiration to construct novel heterostructure materials for application in energy and environmental catalysis.
研究领域:
材料科学
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环境催化
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光化学
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能源转化
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产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2024
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IF 3.8
Ali Nasir,Yutong Liu,Wang Fuyi,Qi Li
Recently, open tubular capillary electrochromatography (OT-CEC) has captured considerable interest; its efficient separation capability hinges on the interactions between analytes and polymer coatings. However, in situ growth of stimuli-responsive polymers as coatings has been rarely studied and is crucial for expanding the OT-CEC technique and its application. Herein, following poly(styrene-maleicanhydride) (PSM) chemically bonded onto the inner surface of the capillary, a dual pH/temperature stimuli-responsive block copolymer, P(SMN-COOH), was prepared by in situ polymerizing poly( N -isopropylacrylamide) carboxylic acid terminated [P(N-COOH)] in PSM. An OT-CEC protocol was first explored using the coated capillary for epimedins separation. As a proof of concept, the developed OT-CEC system facilitated hydrogen bonding and tuning the hydrophilic/hydrophobic interactions between the test analytes and the P(SMN-COOH) coating by varying buffer pH and environmental temperature. Four epimedins with similar chemical structures were baseline separated under 40 °C at pH 10.0, exhibiting dramatical improvement in separation efficiency in comparison to its performance under 25 °C at pH 4.0. In addition, the coated capillary showed good repeatability and reusability with relative standard deviations for migration time and peak area between 0.7 and 1.7% and between 2.9 and 4.6%, respectively, and no significant changes after six runs. This work introduces a paradigm for efficient OT-CEC separation of herbal medicines through adjusting the interactions between analytes and smart polymer coatings, addressing polymer coating design and OT-CEC challenges. Graphical Abstract
研究领域:
分析化学
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高分子科学
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药物分析
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Luheng Wang,Li Xu,Lijuan Lan,Xisi Long
A single spiral sensing unit based on carboxylated multi-walled carbon nanotubes composite dodecylbenzene sulfonic acid-doped polyaniline (MWCNT-COOH@DBSA-PANI) is shown in this research to be capable of detecting both NH 3 concentration and non-contact gap. The sensing unit effectively detects NH 3 concentrations (0–50 ppm) and non-contact gap (0–5 mm), showing a 46.740 % relative change in resistance at 20 ppm NH 3 and superior selectivity (greater relative change in resistance/impedance amplitude/impedance angle to NH 3 than to HCHO/DMF/ethanol/n-hexane). Additionally, within the non-contact gap range of 0–5 mm, it achieves impedance amplitude/angle sensitivity of 1.5652 %/mm (NH 3 : 50 ppm) and 2.2110 %/mm (NH 3 : 0 ppm), respectively. Stability test over 30 days shows relative standard deviations (RSD) of relative change in resistance, impedance amplitude and impedance angle to NH 3 remain below 10.7 %, 9.6 %, and 8.4 %, respectively. Furthermore, the RSD values for its impedance amplitude/angle sensitivity to gap (0–5 mm) do not exceed 8.0 %/7.6 %, correspondingly. When humidity increases from 31 % RH to 75 % RH, the relative change in resistance to 20 ppm NH 3 decreases from 46.740 % to 40.248 %. Finally, by employing the variable separation strategy, the feasibility of dual-function detection is further validated. At a known humidity, NH 3 concentration is determined by the relative change in resistance of sensing unit to NH 3 adsorption. Gap variation is perceived by detecting electromagnetic field disturbances from an approaching target object, manifested as change in the impedance amplitude/angle of the sensing unit. The work establishes a methodological foundation for environmental safety monitoring in confined spaces and real-time operational safety of precision equipment.
研究领域:
传感器与传感技术
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材料科学
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环境监测
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电气工程
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纳米复合材料
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·Vol. 34
·期 6
·2432-2444
·
IF 3.9
Xia Tianhao,Wang Yunpeng,Awasthi Pragati,Dong Wenkun,Li Mengting,Qiao Xvsheng,Chen Dong,Ling Shisheng,Fan Xianping
The separation of target substances is a significant biological detection procedure, where magnetic microspheres can act as high-performance separation materials. However, challenges are still kept to fulfill all the requirements. A submicron magnetic poly (glycidyl methacrylate) (PGMA) microsphere was synthesized in this investigation by utilizing three distinct techniques: in situ coprecipitation, electrostatic self-assembly, and silica surface coating. The PGMA microspheres were initially produced through a soap-free emulsion polymerization technique, wherein the coagulation process was governed by surface charge density. This factor additionally impacted the size and monodispersity of the microspheres. Then, we discovered that the capping agent sodium citrate (Na 3 Cit) effectively regulated the superparamagnetism properties of magnetic microspheres; the critical size of the superparamagnetic was 10.9 nm. Furthermore, the concentration of Fe 2+ and Fe 3+ effectively regulated the saturation magnetization, a property that correlated with the nucleation rate of the Fe 3 O 4 crystal. Additionally, we demonstrated that the pH regulated the electrostatic self-assembly, and it was suggested that positively charged PGMA–NH 2 microspheres and negatively charged Fe 3 O 4 nanoparticles be tightly coupled. For application, the PGMA@Fe 3 O 4 microspheres were subsequently coated with SiO 2 , which had been surface-modified with carboxyl groups. The PGMA@Fe 3 O 4 and carboxyl-modified microspheres exhibited saturated magnetization values of 23.73 and 17.73 emu/g, respectively. These microspheres have been effectively utilized for the extraction of DNA from various sources such as Salmonella typhi, monkeypox virus, and clinical swab samples, suggesting the potential of these microspheres for nucleic acid separation in the biomedical domain.
研究领域:
材料科学
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纳米技术
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生物医学工程
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生物化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）