Kuwait Journal of Science
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2025
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IF 1.1
Mirza Nadeem Ahmad,Muhammad Naveed Anjum,Akbar Ali,Rabeya Ijaz,Sarosh Iqbal,Rashad Al-Salahi,Hatem A. Abuelizz,Cedric Delattre
The synthesis of poly( o -anisidine)/multi-walled carbon nanotubes composite (POA/MWCNTs NC) was carried out via chemical oxidative polymerization for the adsorptive removal of Direct Yellow 26 dye (DY 26). In the polymerization, the ammonium persulphate was used as an oxidant along with 4,4′-diaminodiphenylamine dimer as initiator. Then, the structural composition, crystalline properties, absorption behavior, morphology, and surface attributes of both the polymer and the nanocomposite were analyzed by different techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), UV–visible spectroscopy (UV–visible), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller analysis (BET). BET analysis showed significant improvement in the surface area (690 m 2 /g) and porosity (0.216 cm 3 /g) of the composite material as compared to pure POA. Further, the composite was applied for the elimination of DY 26 in aqueous media. Moreover, the adsorption parameters were also optimized like pH, contact time, adsorbent dose and dye concentration. The highest dye removal efficiency was achieved up to 83% against 50 mg/L concentration of dye solution under the conditions of pH at 2, contact time of 30 min, and 2 g amount of the adsorbent. Furthermore, the kinetic studies revealed that the adsorption of DY 26 followed the pseudo first-order rate constant by the polymeric adsorbent.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
Food Analytical Methods
·
2014
·Vol. 7
·期 7
·1557-1563
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IF 1.802
Zhao Xiaojuan,Zhang Wei,Chen Haiguang,Chen Yuejiao,Huang Guiying
An electrochemical biomimetic sensor was developed for fast and selective detection of ascorbic acid (AA) in orange juice samples via electropolymerizing o -phenylenediamine on the surface of a dual channel screen-printed carbon electrode (SPCE), which could achieve two repetitive measurements by using the same sample drop and improve test efficiency. The square wave voltammograms and scanning electron microscopy images indicated that the many imprinted cavities had formed in the AA-imprinted poly( o -phenylenediamine) film, which acted as a selective recognition element to determine AA by means of the matched size, shape, and orientation of the functional groups between the imprinted cavities and AA molecules. The response current of the imprinted sensor was linearly related to the concentration of AA in both lower concentration regions (0.45–13.52 μM) and higher concentration regions (13.52–409.10 μM), respectively. The detection limit was 0.11 μM based on the signal to noise ratio of 3. The sensor was applied to determine AA in commercial orange juice, and the result was in good agreement with that obtained by 2,6-dichlorophenol indophenol titration method. The fabrication of the sensor was simple and timesaving (<35 min for modifying two work electrodes). Together with portability and disposability of the AA-MIP/SPCE, the proposed sensor had widely potential applications in field test and analysis.
研究领域:
分析化学
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食品科学
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生物医学工程
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DOI
高影响因子
Polymer Chemistry
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2017
·Vol. 8
·期 45
·7033-7043
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IF 5.375
Pan Li,Jiacheng Zhang,Chang-Ming Dong
A photoresponsive poly(o-nitrobenzyloxycarbonyl-L-lysine)-b-PEO (PNBL-b-PEO) polypeptide copolymer was synthesized and its photosensitive cleavage and self-assembly were monitored by means of UV-vis spectroscopy, 1H NMR, DLS, and TEM. Three kinds of dual-sensitive (i.e., photo/pH-thermo) polypeptide normal and reverse micellar hydrogels were then fabricated by the physical cross-linking of the self-assembled micelles. Utilizing the inclusion complexation between α-cyclodextrin (α-CD) and PEO of the normal micelles of PNBL-b-PEO or polylysine-b-PEO, photo/pH-thermo-sensitive normal micellar hydrogels were fabricated; in contrast, the reverse micelles of polylysine-b-PEO@α-CD self-assembled at pH = 3 and then were transformed into a pH-thermo-sensitive reverse micellar hydrogel at pH = 10. The multiple self-assembly and hydrogel properties were thoroughly characterized by means of UV-vis spectroscopy, circular dichroism (CD), wide angle X-ray diffraction (WAXD), DLS, zeta potential, rheology, TEM, and SEM. Notably, these dual-sensitive polypeptide hydrogels with a higher mechanical modulus (10–105 kPa) were facilely constructed and the mechanical modulus can be further tuned by varying the UV-irradiation time, the amount of α-CD added, and the copolymer concentration. Consequently, this work provides a versatile platform for constructing polypeptide copolymer hydrogels with tunable mechanical and stimuli-sensitive properties.
研究领域:
高分子化学
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材料科学
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生物材料
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DOI
高影响因子
SYNTHETIC METALS
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2014
·
IF 2.222
Fang Liao,Siwei Yang,Xiubing Li,Shuai Yan,Chenshu Hu,Ling He,Xinyuan Kang,Xun Song,Tongyan Ren
The amorphous structure of conducting polymers (CPs) has made it difficult for the researcher to get regular crystallike CP nanoparticles (such as: cube, triangle, polygon and polyhedron) without template. This paper brings forward a new idea for to get regular crystallike CP nanoparticles via the structure-directing role which can be attributed to the dipole and π–π interaction between oligomers . The regular hexagonal prism or equilateral triangle shapes PoPD nanoparticles can be easily prepared with our new way. The mechanism is proved by analyzing the morphology of precursor at the early stage of hydrothermal progress. We also explored the feasibility of using nano-sized PoPD hexagonal prisms for Cu 2+ supersensitive fluorescence detection. The ultra-sensitive of PoPD hexagonal prisms is remarkable.
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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 77
·48894-48903
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IF 3.108
Ziyang Lu,Zehui Yu,Jinbo Dong,Minshan Song,Yang Liu,Xinlin Liu,Di Fan,Zhongfei Ma,Yongsheng Yan,Pengwei Huo
A stable core–shell imprinted Ag-(poly-o-phenylenediamine)/CoFe2O4 (imprinted Ag-POPD/CoFe2O4) was synthesized via the surface imprinting technique. Ag-POPD was introduced into an imprinted layer, which significantly enhanced the photocatalytic activity. Meanwhile, due to the existence of imprinted cavities in the imprinted layer, the imprinted Ag-POPD/CoFe2O4 exhibited the superior specific recognition capability for selective photodegradation of ciprofloxacin (CIP). This work puts forward a novel design idea for synthesizing imprinted photocatalysts.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Hai Chi,Chong Yang,Guoqin Liu
In this study, an electrochemical sensor based on MoS 2 with enhanced electrochemical signals from electrochemically activated carbon cloth (EACC) electrodes and cross-linked o- aminothiophenol functionalized AuNPs ( o- ATP@AuNPs) was developed for the detection of the unsaturated vegetable oil antioxidant tert-butylhydroquinone (TBHQ). In this approach, carbon cloth is activated through the implementation of electrochemical methods, thereby effectively increasing its specific surface area. The resulting EACC, serving as an electrode substrate, enables the growth of additional nanomaterials and enhances conductivity. The incorporation of MoS 2 effectively augments the sensitivity of the electrochemical sensor. Subsequently, MIP/MoS 2 /EMCC is formed via electropolymerization, utilizing TBHQ as the template molecule and o-ATP@AuNPs as the functional monomer. The S S bond of o-ATP ensures a strong and stable connection between MoS 2 and o-ATP@AuNPs, thereby facilitating the immobilization of MIP. In addition, the high conductivity possessed by o- ATP@AuNPs could effectively improve the sensitivity of the electrochemical sensor. Under the optimal conditions, MIP/MoS 2 /EMCC could determine TBHQ in the range of 1 × 10 −3 μM to 120 μM by differential pulse voltammetry (DPV) with a detection line of 0.72 nM. The proposed MIP/MoS 2 /EMCC is expected to be applied in the future for the selective and sensitive detection of TBHQ in vegetable oils.
研究领域:
分析化学
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材料科学
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电化学
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食品科学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
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IF 4.758
Jin Zhang,Chaoying Wang,Yanhui Niu,Shijie Li,Rongqin Luo
A novel electrochemical sensor based on molecularly imprinted polymer membranes (MIPM) as biomimetic molecular recognition element involved in o -aminothiophenol functionalized Au nanoparticles (ATP@AuNPs) modified gold electrode was constructed for sensitive and selective detection of herbicide simazine (SMZ). The nano-scaled MIPM, with high specific surface area, was prepared by self-assembly of o -aminothiophenol (ATP) and electrodeposition of ATP@AuNPs in the presence of template SMZ. Cathodic current of SMZ was measured by cyclic voltammetry and the results exhibited that the proposed sensor possess a high electrocatalytic activity at a negative potential and a fast rebinding dynamics towards the reduction of SMZ in 0.01 M H 2 SO 4 solution (pH 1.7). Linear dependency of peak current on SMZ concentrations was observed from 0.03 to 140 μM and detection limit was estimated to be 0.013 μM (3S/N). The enhancement of sensitivity was attributed to the presence of gold nanoparticles (AuNPs) which decreased the electron-transfer impedance and increased imprinting sites, lead to the superior enrichment effect of the trace amount of SMZ in aqueous solvent. The developed SMZ imprinted sensor exhibited excellent long-term stability and acceptable repeatability. In addition, the proposed method was successfully applied to measure SMZ in several real samples with the spiked recoveries changing from 91.4% to 96.8%, showing a promising potential in practical application.
研究领域:
分析化学
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环境科学
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纳米技术
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电化学
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高影响因子
MICROCHIMICA ACTA
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2017
·Vol. 184
·期 6
·1791-1799
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IF 4.58
Wang Xiangyan,Sun Duanping,Tong Yanli,Zhong Yongsheng,Chen Zuanguang
A regenerable and ultrasensitive voltammetric biosensor is described for the determination of thrombin. It relies on a combination of (a) enzymatic catalysis, (b) a G-quadruplex/hemin DNAzyme system, and (c) AuPd nanoparticles for signal amplification. Poly(o-phenylenediamine) was decorated with AuPd nanoparticles and loaded with horseradish peroxidase (HRP) and thrombin aptamer (TBA), and the mixture was allowed to interact with hemin to form the G-quadruplex/hemin/HRP/AuPd/poly(o-phenylenediamine) bioconjugates. In the presence of thrombin, the bioconjugates remain immobilized on the surface of the modified glassy carbon electrode through a sandwich reaction. Poly(o-phenylenediamine) also acts as a redox mediator, and the electrochemical reaction of poly(o-phenylenediamine) in the presence of H 2 O 2 is efficiently catalyzed by HRP, AuPd nanoparticles and G-quadruplex/hemin as the peroxidase mimics. Thus, a remarkably amplified electrochemical signal is obtained by the triple catalytic amplification. The biosensor has a dynamic range that spans the 100 f. to 20 nM thrombin concentration range, and the detection limit is 20 fM. The biosensor can be regenerated by applying an electrochemical desorption technique that breaks the gold-thiol bond and releases the components from the surface. In our perception, the mediator-free and signal-amplified biosensor demonstrated here has a large potential with respect to the quantitation of thrombin in clinical samples.
Schematic of the assay: The peroxidase-like AuPd nanoparticles, G-quadruplex/hemin DNAzyme and horseradish peroxidase synergistically catalyze the electrochemical reaction of poly(o-phenylenediamine) in the presence of H 2 O 2 , thereby amplifying the electrochemical detection signal of thrombin.
研究领域:
生物化学
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分析化学
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纳米技术
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生物医学工程
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产品关联
DOI
高影响因子
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