SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Haoyang Wang,De-Jing Li,Jing Ren,Fan Yang,Shujun Guo,Jun Wang,Cheng Zhang,Bingwen Zhang,Hongfei Liu,Yang Zhang
The selective separation and detection of benzene from toluene remains a critical challenge due to their structural similarity and the toxicity of benzene. In this work, we develop a novel composite substrate, PIZA-AgNW, consisting of a metal-organic framework (MOF), silver nanowires (AgNWs), and filter paper, fabricated via liquid-phase epitaxy (LPE). This substrate enables highly selective and real-time detection of benzene from toluene using tandem surface-enhanced Raman spectroscopy (SERS) and quartz crystal microbalance (QCM) analysis. The LPE method affords precise control of MOF thickness and pore structure, enhancing molecular selectivity for Raman detection. By correlating Raman intensity with QCM-derived mass changes, we achieve real-time monitoring of adsorption/desorption dynamics and quantify both equilibrium and nonequilibrium separation factors. Notably, a high equilibrium separation factor ( αₑ ) of 134 was obtained for a 1:1 benzene/toluene mixture. This work demonstrates a practical strategy for integrating structural selectivity with real-time sensing and offers broad potential for the dynamic monitoring of volatile organic compounds (VOCs) in environmental and industrial applications.
研究领域:
分析化学
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材料科学
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环境监测
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传感器与检测技术
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DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 19
·3970
·
IF 4.967
Ming Chang,Xiaomin Ma,Xianshu Dong,Yuping Fan,Ruxia Chen
It is important to identify an environmentally friendly and efficient flocculant that can replace polyacrylamide for the solid–liquid separation of coal wastewater. In this study, to explore whether chitosan can be used as an environmentally friendly and efficient flocculant for the solid–liquid separation of coal wastewater, AlCl3–chitosan was used to conduct flocculation–sedimentation and dewatering tests under different chitosan dosages and shear-strength conditions for the prepared coal wastewater. Focused beam reflectance was measured to dynamically monitor the number of refractory fine particles, and the settled flocs were photographed and analyzed with microscopy to explore the effect of AlCl3–chitosan on the flocculation settlement effect and floc characteristics. The synergistic mechanisms of AlCl3and chitosan were investigated using quartz crystal dissipative microbalance and zeta potential measurement. The results showed that the addition of chitosan can significantly improve the flocculation–sedimentation and dewatering effects of coal wastewater. A reasonable dosage under a certain shear strength is conducive to the reduction of fine slime particles, which results in a compact floc structure, increases the floc size, and improves the settling effect. The synergistic effect of AlCl3–chitosan improved the electric neutralization and adsorption bridging abilities of the chitosan, and the mixed solution of AlCl3and chitosan had stronger adsorption on the carbon surface. This study provides a new approach to the selection of flocculants for coal wastewater treatment.Keywords:coal wastewater;chitosan;solid–liquid separation;FBRM;QCM−D
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Chemosensors
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2022
·Vol. 10
·期 12
·522
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IF 4.229
Pengjia Qi,Ziwei Xu,Tong Zhang
Polydopamine (PDA) films were successfully prepared on quartz crystal microbalance (QCM) by in-situ growth method, and the obtained QCM sensor was used for humidity detection. Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) were used to study the chemical composition and microstructure of the in-situ grown PDA sensitive films. The experimental results showed that the PDA-QCM humidity sensor with 2 h polymerization growth times (2-PDA-QCM) owned high sensitivity (20.77 Hz/% RH), good selectivity, short response/recovery time (5 s/11 s) and acceptable long-term stability. In addition, the energy loss of the sensors fabricated under different conditions was investigated by impedance analysis. Based on all the test results, it is concluded that the combination of in-situ growth method and QCM can produce a room temperature humidity sensor with excellent performance.Keywords:quartz crystal microbalance;in-situ growth;polydopamine;humidity detection
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
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2023
·Vol. 30
·期 5
·813-823
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IF 4.8
Xu Ruijing,Zou Wenjie,Rao Bo,Zhao Wei,Wang Ting,Zhang Zhijun
This study presents a comparative study of the flocculation behavior of kaolinite induced by chitosan-graft-poly(acrylamide-dimethyl diallyl ammonium chloride) (Chi-g-CPAM) and a commercial cationic polyacrylamide (CPAM). The flocculation behaviour was characterised in terms of both flocculation kinetics and the corresponding morphology changes during flocculation. Both Chi-g-CPAM and CPAM were grafted from silica wafers by means of atom transfer radical polymerization (ATRP). The quartz crystal microbalance with dissipation (QCM-D) tests were conducted. The equilibrium time flocculated by Chi-g-CPAM was found to be 0.46 times as that of CPAM, together with a larger total mass of kaolinite layer. The flocculation behaviour by Chi-g-CPAM can be well captured by a pseudo-first-order model. In contrast, the presence of CPAM leads to a more complex kinetics. A relatively larger fitting slope (0.4663) was obtained at the initial stage but the fitting slope droped to 0.2026 after 800 min, indicating a densification process caused by CPAM. The flocculation kinetics of CPAM can be captured by the Elovich model for the inital stage but the combination of pseudo-first-order and pseudo-second-order models for the latter stages, which can be attributed to the long chain of CPAM. With a dosage of 75 g/t, the settling test with Chi-g-CPAM exhibits the same turbidity in the supernatant but a smaller layer thickness of the settlement compared to CPAM. The study enables a better understanding of the flocculation behavior and contributes to the development of efficient flocculants in mineral processing and tailings treatment.
研究领域:
矿物加工
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材料科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Jialin Liu,Dongzi Zhou,Zitong Wang,Fangli Sun,Haicun Yang,Junfeng Cheng,Dong Wang,Dun Wu,Cheng Zhang,Chunlin Liu,Louis C. P. M. de Smet,Zheng Cao
Sn nanoparticle–carbonized (Sn@C) nanofibers via electrospinning + calcination • Sn@C + chitosan (CS) ⇒ CS/Sn@C layers by spin coating • Layer tested for humidity sensing by quartz crystal microbalance (QCM) • High repeatability and reversibility; low humidity hysteresis • Combining structural integrity (Sn@C) + water adsorption sites (CS) SnCl₂·2H₂O was introduced into polyacrylonitrile (PAN) nanofibers through a simple electrospinning method, and composite Sn nanoparticle–carbonized (Sn@C) nanofibers were prepared by two-stage calcination. After dispersing different amounts of composite nanofibers in a 2.5 wt% chitosan (CS) solution via ultrasonication, a series of CS/Sn@C composite humidity-sensitive layers were spin-coated on quartz crystal microbalance (QCM) sensor surfaces. The morphology, structure, and composition of Sn@C nanofibers were analyzed by SEM, TEM, XPS, and BET. The diameter of Sn@C nanofibers was decreased from 180 nm to 95 nm upon decreasing the PAN content from 90% to 60%. The presence of metallic Sn nanoparticles, formed on the surface of Sn@C nanofibers, resulted in an increase in specific surface area from 5.1 m²·g⁻¹ to 106.5 m²·g⁻¹. Using an electrospinning solution with PAN:SnCl₂·2H₂O (8:2 w/w) and a Sn@C dispersion (0.05 mg/mL) in 2.5 wt% CS solution, a QCM sensor with a fitting correlation coefficient of 0.9998 was fabricated. The sensor parameters were optimized through QCM testing under varying conditions. The sensor demonstrated fast response/recovery times: <1.2 s (response)/50 s (recovery) in 11–33% RH and 67 s/37 s in 11–98% RH. Additionally, the CS/Sn@C-modified QCM sensor exhibited high repeatability, reversibility, and low humidity hysteresis. Download: Download high-res image (169KB) Download: Download full-size image
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2013
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IF 3.535
Pengfei Ding,Ruxiu Liu,Shihui Liu,Xueyin Mao,Ruifen Hu,Guang Li
This report describes a novel method to realize high sensitive C-reactive protein (hs-CRP) by using a quartz crystal microbalance (QCM) immunosensor based on 20 nm gold nanoparticles conjugated anti-CRP antibodies. A sandwich-type assay was established: CRP was firstly recognized by the anti-CRP antibody which was immobilized on the gold electrode of the QCM and the sensitivity was enhanced further by binding AuNP conjugated anti-CRP antibody secondly. The response of the QCM is observed to be linearly relative to the CRP concentration in the range of 20 ng/mL to 30 μg/mL and the detection limit is enhanced to a great extend by the amplification procedure. The sensor was regenerated online by the solution of 3 mol/L Urea while preserving the activity of the immunosensor.
研究领域:
生物医学工程
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免疫学
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纳米技术
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Luyu Wang,Yongpeng Yu,Qun Xiang,Jin Xu,Zhixuan Cheng,Jiaqiang Xu
To avoid false response caused by increase of environmental humidity is important for hydrophilic polydopamine (PDA) based QCM formaldehyde sensor. In order to achieve this purpose, superhydrophobic polymerized n -octadecylsiloxane (PODS) nanostructure is used to cover the surface of PDA film to prevent false response from happening. Compared with pristine PDA based QCM sensor, the sensor based on PODS-PDA composite sensing material shows satisfactory performance on avoiding false response and long-term stable formaldehyde sensing properties. This novel strategy offers a new method to reduce probability of false response resulted from humidity change.
研究领域:
材料科学
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传感技术
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环境监测
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
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2019
·
IF 2.739
Pengjia Qi,Tong Zhang,Jieren Shao,Bai Yang,Teng Fei,Rui Wang
A quartz crystal microbalance (QCM) humidity sensor based on graphene quantum dots-chitosan (GQDs-CS) sensitive film has been successfully fabricated in this work. The composite ratio of sensitive material and the coating quality of the sensitive film were optimized. The morphological and chemical properties of GQDs-CS composites were inspected via scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier Transform infrared spectroscopy (FT-IR). The results manifest that prepared QCM sensor exhibits high response sensitivity (a frequency shift of −3291 Hz at 95% RH), short response/recovery time (36 s/3 s), tiny humidity hysteresis (˜1.6% RH), and excellent reproducibility, reversibility and long-term stability. Additionally, the electroacoustic parameters of the QCM sensors were also investigated by means of the impedance analysis method. Based on dynamic and static analysis of the sensor, it is speculated that the introduction of GQDs into CS enhanced the mechanical stiffness of the CS film, which could effectively improve the performance of QCM sensor.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
Nanomaterials
·
2026
·Vol. 16
·期 8
·467
·
IF 4.8
Lina Wang,Chong Li,Lei Peng,Junyu Niu
The detection of ammonia (NH3) at room temperature is of significant importance for environmental monitoring, industrial safety and early disease diagnosis. In this work, a novel room-temperature ammonia sensor was developed by combining graphene oxide with WO3quantum dots. The as-fabricated sensor exhibited excellent comprehensive sensing performance, including high sensitivity, rapid response, outstanding selectivity, and reliable long-term stability. Specifically, when exposed to 10 ppm NH3, the sensor based on 1.5% GO@WO3nanocomposites achieved a frequency shift of 578 Hz, which was 6.4 times that of the pure WO3QDs sensor. The theoretical limit of detection (LOD) of the sensor was calculated to be 60 ppb, enabling ppb-level NH3detection. In addition, the sensor demonstrated good long-term stability over a two-week period. The enhanced performance of the GO@WO3nanocomposite sensor is attributed to the formation of an ohmic contact between GO and WO3, which eliminates charge transfer barriers, promotes oxygen adsorption, and amplifies the sensing signal. This work provides a simple, efficient, and practical solution for room-temperature NH3detection, offering significant advantages over traditional single-component sensors.
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DOI
PubMed
高影响因子
MINERALS ENGINEERING
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2019
·
IF 3.315
Wenjie Zou,Lu Gong,Jun Huang,Mingfei Pan,Zhenzhen Lu,Chunbao Sun,Hongbo Zeng
Selective flocculation is an efficient separation method for processing fine coal. In this work, one type of hydrophobically modified polyacrylamide, poly(AM-NaAA-C 16 DMAAC) (HMPAM), was synthesized and used as flocculants of coal. The adsorption and interaction of HMPAM on model coal surface under the influence of KCl concentration were compared with a commercial polyacrylamide (PAM) using quartz crystal microbalance with dissipation monitoring (QCM-D), multi-angle laser light scattering (MALLS) and atomic force microscope (AFM). The QCM-D results showed that the adsorption amounts of both PAM and HMPAM on model coal surface increased with increasing KCl concentration, and the amount of HMPAM was much higher than that of PAM in 100 mM KCl solution. This result could be due to the fact that the high salinity (e.g., 100 mM KCl) led to the compressed conformation of the polymers and significantly compressed electric double layer repulsion. The conformational changes were determined using MALLS. The AFM force measurement results showed that the adhesion between the polymers and model coal surface increased with increasing the KCl concentrations due to the compressed electric double layer, and the average adhesion of PAM was about one order of magnitude smaller than that of HMPAM. Such difference was mainly ascribed to the hydrophobic attraction between the hydrophobic chain of HMPAM and model coal surface. Meanwhile, the attractive hydrophobic interaction between the hydrophobic chains induced the formation of multiple layers of HMPAM, which was in consistence with the QCM-D results. The fundamental insights into the interaction mechanisms of HMPAM/PAM on model coal surface will benefit the rational development of effective polymer additives for fine coal preparation.
研究领域:
矿物加工工程
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界面化学
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高分子化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Wei Chen,Fanfei Deng,Min Xu,Jun Wang,Zhenbo Wei,Yongwei Wang
Graphene oxide and cuprous oxide ( G O/Cu 2 O) nanocomposite based quartz crystal microbalance (QCM) gas sensor via layer-by-layer self-assembly (LBLSA) method was developed for trimethylamine (TMA) gas sensing under concentrations of 5 ppm. The sensor response increased linearly with the concentration of TMA, which was consistent with the Saurebrey equation. It also had good sensitivity, reversibility, selectivity and stability in 60 days. The detection limit of 230 ppb was achieved which was the lowest detection levels among recently reported QCM gas sensor towards TMA under room temperature. The sensing mechanism of GO/Cu 2 O nanocomposite based QCM gas sensor towards TMA under low concentrations was proposed as follows: (1) an adsorption-desorption process via hydrogen bonding between the GO surface carboxyl groups and TMA molecules; (2) enhanced physical adsorption of TMA gas molecules via LBLSA method due to enlarged surface area and p-n junction of GO/Cu 2 O nanocomposite. This GO/Cu 2 O nanocomposite based QCM gas sensor may provide a foundation for the TMA gas sensors development in areas of environmental protection and food safety.
研究领域:
材料科学
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环境科学
·
食品安全
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DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Mingzhu Yao,Chen Liang,Shuangquan Yao,Yang Liu,Hui Zhao,Chenni Qin
The adsorption of hemicellulose derived from bagasse onto nanofibril cellulose has been studied in terms of kinetics and thermodynamics. In situ monitoring of bagasse hemicellulose with different molecular weights onto the nanofibril cellulose surfaces has been investigated using quartz crystal microbalance and dissipation. Then, the adsorption kinetics and thermodynamic properties were analyzed. Also, the sorption behavior and the adsorption layer properties were quantified in aqueous solutions. The maximum adsorption mass was 2.8314 mg/m2 at a concentration of 200 mg/L. Also, compared with that of the low-molecular-weight hemicellulose, the adsorption capacity of the high-molecular-weight hemicellulose was higher, and the adsorption rate changed faster and could reach an equilibrium in a shorter time. The intraparticle diffusion kinetic model represented the experimental data very well. Therefore, the kinetics of hemicellulose on the fiber adsorption was commonly described by a three-stage process: mass to transfer, diffusion, and equilibrium. The Gibbs energy change of the adsorption of hemicellulose was found to range from −20.04 to −49.75 kJ/mol at 25 °C. The entropy change was >0. It was found that the adsorption was spontaneous, and the adsorbed mass increased with the increase in temperature. This strengthened the conclusion that the adsorption process of the bagasse hemicellulose on the NFC was driven by the increase in entropy caused by the release of water molecules due to hydrophobic interaction or solvent reorganization.
研究领域:
生物化学
·
材料科学
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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）