Biosensors-Basel
·
2023
·Vol. 13
·期 12
·1024
·
IF 5.4
Yanju Wu,Keyu Chen,Fei Wang
In this study, a composite film was developed for the electrochemical sensing of tryptophan (Trp). Porous reduced graphene oxide (PrGO) was utilized as the electron transfer layer, and a C-undecylcalix[4]resorcinarene Langmuir–Blodgett (CUCR-LB) film served as the molecular recognition layer. Atomic force microscopy (AFM), transmission electron microscopy (TEM), Raman spectroscopy, scanning electron microscopy (SEM), and electrochemical experiments were employed to analyze the characteristics of the CUCR-LB/PrGO composite film. The electrochemical behavior of Trp on the CUCR-LB/PrGO composite film was investigated, revealing a Trp linear response range of 1.0 × 10−7to 3.0 × 10−5mol L−1and a detection limit of 3.0 × 10−8mol L−1. Furthermore, the developed electroanalytical method successfully determined Trp content in an amino acid injection sample. This study not only introduces a rapid and reliable electrochemical method for the determination of Trp but also presents a new strategy for constructing high-performance electrochemical sensing platforms.Keywords:Langmuir–Blodgett film;porous reduced graphene oxide;calix[4]arene;electrochemical sensing;tryptophan
研究领域:
分析化学
·
生物医学工程
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DOI
PubMed
高影响因子
Polish Journal of Chemical Technology
·
2019
·Vol. 21
·期 4
·89-97
·
IF 0.975
Yuqi Wang,Yanhui Li,Heng Zheng
New kind of adsorbent was produced from Trichosanthes kirilowii Maxim shell. The KOH activation technology for preparation of Trichosanthes kirilowii Maxim shell activated carbon (TKMCK) was optimized. Using methylene blue as the sample adsorbate, the adsorption behavior was systematically investigated in terms of the activation agent and temperature, the adsorption temperature and time, the initial adsorbate pH and concentration, as well as the dosage of adsorbent. Surface physical morphology of the TKMCK prepared was observed by scanning electron microscopy (SEM), while the functional groups were determined with Fourier transform infrared (FTIR) spectra. Kinetic studies indicated that the adsorption process was more consistent with the pseudo-second-order kinetic. Both Langmuir and Freundlich isotherms were employed to fit the adsorption data at equilibrium, with the former giving a maximum adsorption capacity of 793.65 mg/g at 323 K. BET surface area of as-prepared TKMCK was 657.78 m2/g.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2017
·
IF 0.754
Jin Lin,Yan Wu,Afshin Khayambashi,Xiaolong Wang,Yuezhou Wei
The silica-based CeO2 adsorbent (CeO2/SiO2) was prepared for removing fluoride from the aqueous solution. The synthesized adsorbent was characterized by scanning electron microscope, energy dispersive spectrum, X-ray diffractometer, Fourier transform infrared spectrometer, and zeta potential measurement analyses. The adsorption batch experiments in the various experimental conditions including solution pH, contact time, initial fluoride concentration, and adsorption temperature were performed and investigated. The maximum adsorption capacity of fluoride into CeO2/SiO2 was 2.441 mmol/g at pH 3 and 298 K. The adsorption kinetics and isotherms were well described by the pseudo-second-order model and the Langmuir model, respectively. The fluoride adsorption reached the equilibrium in 15 min from the aqueous solution with the initial fluoride concentration of 400 mg/l at 298 K. In the temperature range of 298–338 K, the maximum adsorption capacity of fluoride decreased from 2.441 mmol/g to 2.109 mmol/l at pH 3. The adsorption thermodynamics study revealed that this process was a spontaneous, exothermic, and entropy-driving adsorption. Furthermore, the mechanism of adsorption was identified as the anion exchange and the electrostatic interaction. The desorption efficiency of fluoride-loaded CeO2/SiO2 adsorbent could reach about 95% by 0.1 mol/l NaOH.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Zaharaddeen N. Garba,Saadatu A. Hamza,Chavalit Ratanatamskul
In this study, a novel impregnation method was adopted by adding Cu 2+ to microcrystalline cellulose (MCC) powder, producing a composite material (Cu-MCC) that was used as a sorbent to treat water contaminated by crude oil. The produced Cu-MCC was examined using a variety of characterization techniques. With the application of central composite design (CCD) for testing the influenced parameters, the experimental and predicted oil sorption capacity (OSC) values were 10.61 and 9.86 mg/g, respectively at the optimal condition of initial concentration (120 mg/100 mL), sorbent dosage (80 mg) and reaction time of 78 mins. This indicates that the predicted values from the model agree closely with the experimental values, with only a small error of 0.75. The adsorption data were simulated using five different versions of the linearized Langmuir equations along with the Freundlich and Temkin adsorption isotherms. Langmuir-2, which denotes a monolayer sorption process best describes the equilibrium adsorption data giving maximum sorption capacity of 6.48 mg/g with pseudo-second order model as the best model for the kinetics data. The findings show that Cu-MCC is very promising as an effective material for cleaning up water contaminated from crude oil.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
NANO
·
2020
·
IF 1.566
Shicheng Liu,Guanjing Qi,Cong Ding,Kun Tan,Meiling Yin,Tingting Zhang,Zhenzhen Xu
Adsorption of gemfibrozil (GF) from aqueous solution by highly/lowly graphitized carbon black (GCB-H/GCB-L) was investigated by batch and fixed-bed experiments. Results showed that the adsorption of GF onto GCB greatly depended on solution pH and graphitization of carbon. The pseudo-second-order kinetic model was found to be more appropriate in describing the adsorption processes of two GCBs. The adsorption equilibriums were well fitted with the Langmuir isotherm model, and GCB-H exhibited a higher adsorption capacity of 47.68 mg g −1 at 298 K, compared with GCB-L of 4.33 mg g −1 . GCB-H achieved 69.76% GF removals in simulated water after 6 h, indicating its potential practicability. The GCBs were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR), and the results indicated that the π - π interaction was strongly involved in the adsorption. Thermodynamic studies further suggested that the adsorption of GF on GCB-H was exothermic, which could happen spontaneously at any temperature mainly through π - π interaction for physical adsorption on the surface of the plane.
研究领域:
环境科学
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材料科学
·
药学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Kexin Wang,Hui Ma,Shengyan Pu,Chun Yan,Miaoting Wang,Jing Yu,Xiaoke Wang,Wei Chu,Anatoly Zinchenko
Easy-to-obtain magnetic bentonite-chitosan hybrid beads (Bn-CTS) were prepared by immobilizing bentonite within a porous structure of chitosan beads to achieve a hybrid adsorption effect for the removal of cesium ion (Cs + ) from water. The hybrid adsorbent, which had a porous structure and abundant binding sites contributed by both chitosan and bentonite, ensured superb adsorption characteristics. The paramagnetic character of the beads enabled their facile separation for recycling. The chitosan/bentonite ratio, pH and contact time were optimized to achieve the optimal Cs + efficiency, and the adsorption kinetics and isotherms were thoroughly discussed. The adsorption kinetics obeyed the pseudo-second-order model, and the best fitted equation for equilibrium data was the Langmuir isotherm model. The maximum adsorption capacity of the bentonite-chitosan beads was 57.1 mg g −1 . The adsorbent had excellent selectivity towards Cs + adsorption in the presence of abundant cations (Li + , Na + , K + and Mg 2+ ). The adsorbent was able to be recycled by treating the beads with 0.1 mol L −1 of MgCl 2 to quantitatively desorb Cs + from the beads. Overall, the magnetic bentonite-chitosan beads can be used as a highly efficient adsorbent for radioactive waste disposal and management.
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
RSC Advances
·
2015
·Vol. 5
·期 123
·101819-101825
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IF 3.84
Huimei Cai,Guijie Chen,Chuanyi Peng,Lingyun Xu,Zhengzhu Zhang,Fei Ke,Xiaochun Wan
In this paper, a novel type of adsorbent was prepared by loading Al/Zr onto carboxymethyl starch sodium to generate CMS–Al, CMS–Zr or CMS–Al–Zr. The adsorbents were tested for removal of fluoride by batch adsorption experiments under various conditions. It was found that CMS–Al–Zr performed well over a considerably wide pH range of 4–10. The adsorption process could be described by a Langmuir isotherm model and Lagergren pseudo-second-order kinetic model. The maximum adsorption capacity for CMS–Al–Zr (60.61 mg g−1) was higher than CMS–Al (51.44 mg g−1) and CMS–Zr (40.23 mg g−1) due to synergistic interactions between Al and Zr. SEM, EDS, XRD, FTIR and XPS studies revealed the Al/Zr loading process and mechanism of fluoride adsorption. The results showed that the metal complex was coordinated to the –COO group of CMS through ion exchange of sodium during the loading process.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.042
Dongyang Zhou,Bin Gu,Jingjing Wang,Lili Ren,Guoguang Chen,Xiaolong Yang,Zhang Tao
In order to enhance the adsorption property of adsorbent, surface modification of existing adsorption materials has always been an interesting and challenging topic. Herein, the flower-like MnO2 nanowires (MNs) with three dimensions surface area and great adsorption property was successfully prepared by two-step hydrothermal route via MnO2 nanosheets in-situ growth on MnO2 nanowires. As an adsorbent, the MNs was evaluated for the removal of methylene blue (MB) from the aqueous solution. The effect of pH value, contact time, adsorbent dose, adsorption equilibrium, kinetics adsorption process, and isothermal models was investigated. The results showed that the maximum adsorption capacity of MNs of 2 g/L attained 34.247 mg/g at 5 minutes, and kinetics of MB were found fitting using the Langmuir model and the pseudo-first-order model, respectively. Furthermore, the adsorption capacity can be kept over 90% after five adsorption cycles. Therefore, the composite material can be a promising tool for developing a large variety of efficient and stable adsorbents by combining with different nanostructures for dyeing wastewater treatment.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 11
·1-9
·
IF 3.061
Wang Biao,Wan Xin,Liu Ziqian,Zhong Jinrong,Tan Jinglin,Li Yan,Zhang Yue-Fei
In this paper, the organic gel polyacrolein (PA OG ) was prepared by NaOH-induced ionic polymerization with acrolein as raw material, which presented good adsorption performance on acid fuchsin (AF). It has been characterized using BET, FT-IR, zeta potential measurements, and XPS to determine the structural and physicochemical properties of PA OG . The adsorption performance was examined in relation to contact time, temperature, and pH value. According to the results, polyacrolein gel adsorbent had a fast adsorption rate, and the adsorption process basically reached equilibrium in the first thirty minutes, which agreed with the pseudo-second-order kinetics. It was determined that the adsorption isotherm conformed to the Langmuir model, which was the endothermic spontaneous reaction (ΔH > 0, ΔG < 0). The five executed adsorption–desorption cycles of AF suggested a good reusability of PA OG . These results can help us better understand the adsorption mechanism of PA OG on AF and provide useful treatment method for removing AF.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Sustainable Materials and Technologies
·
2025
·
IF 9.2
Xiongchao Liu,Xinyu Li,Na Gao,Zhiwei Liu,Yuangang Li,Mingli Wang,Tifeng Jiao
In recent years, nanomaterials have garnered significant attention from both academic and industrial sectors owing to their exceptional properties and diverse application potential. In this context, the Langmuir-Blodgett (LB) technique, as an efficient self-assembly method, has been widely used for the preparation of functional thin films. Based on this, in this work, thin films based on perylene diimide (PDI) and naphthalene diimide (NDI) derivatives composites with dyes were successfully prepared using the LB technique and tested for their performance in gas sensing and Surface-Enhanced Raman Scattering (SERS). The experimental results show that the composite films have excellent response in acid-base gas sensing, especially in the CR dye subphase, and the PDI/CR and NDI/CR composite films are sensitive to HCl and NH 3 gases, with the NDI/CR composite films showing the most sensitive performance. In addition, the PDI/RhB 40-layer composite membranes exhibited significant SERS of R6G molecules with an enhancement factor as high as 3.94 × 10 5 , which is superior to many similar materials. The results presented herein demonstrate the substantial potential of LB technology in the development of multifunctional thin-film devices and its application in gas sensing and SERS.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yue-Yang Ma,Ya Li,Hong-Xiang Huang,Dong-Jin Qian
Luminescent lanthanide complexes have attracted growing attention in the visual probe for detection of toxic and dangerous materials. Here, we report an interfacial self-assembly of Eu 3+ -dipicolinic acid complex functionalized nanoSiO 2 composites (nanoSiO 2 PyTAEu) and their Langmuir-Blodgett (LB) films as well as the luminescent probes to tetracycline (TC) and oxytetracycline (OTC). Organic linkers and Eu 3+ ions are anchored on the hydrophilic nanoSiO 2 particles’ surface via the surface silanization, substitution and coordination reactions, so they exhibit high stability and well distribution in the solutions and LB films. Both the nanocomposites of nanoSiO 2 PyTAEu and their LB films show strong and enhanced red fluorescence emissions of Eu 3+ ions when they are immersed in the aqueous TC solution, with the detection limit to 3.3 and 0.91 nmol/L, respectively. The present nanocomposites and LB films have the advantages of high sensitivity and stability.
研究领域:
化学
·
材料科学
·
生物分析
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 326
·期 3
·1843-1852
·
IF 1.137
Wang Zili,Liu Zhirong,Ye Tianzhen,Wang Yun,Zhou Limin
The tannic acid-chitosan hydrothermal carbon (TCHC) by hydrothermal carbonization is first used in uranium(VI) adsorption. The characterization of HCTC was investigated by scanning electron microscopy, X-ray diffraction, infrared spectroscopy (FTIR). The effects of pH, adsorbent dosage, initial U(VI) concentration, temperature and contact time on the adsorption of uranium(VI) were expressed in batch experiments. A maximum adsorption capacity 96.99 mg/g has been achieved at pH = 5.5, T = 25 °C and initial concentration of U(VI) solution 80 mg/L. The adsorption data fit well with the Langmuir model and pseudo second order kinetics model, indicating that uranium(VI) was monolayer covered on the surface of the material, and the adsorption process was mainly chemisorption. Thermodynamic data indicates that the immobilization of uranium(VI) to the material surface was spontaneous and endothermic. TCHC in low-cost is a promising adsorbent for uranium(VI) adsorption.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
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