TETRAHEDRON LETTERS
·
2024
·
IF 1.5
Yuying Bian,Xinhui Song,Yuxin Han,Guang Wang,Hongmei Qiao
In this paper, M-TzDha-COF composed of 4,4′,4″-(1,3,5-triazine-2,4,6-triyl) trianiline (Tz) and 2,5-dihydroxy-1,4-benzenedicarboxaldehyde (Dha) was synthesized by grafting carboxyl groups onto COF framework via the solvent-free esterification. M-TzDha-COF retains the porous structure and has good crystallinity and high thermal stability. M-TzDha-COF exhibits selective adsorption and efficient removal of methylene blue dye with the maximum adsorption capacity of 95 mg·g −1 . M-TzDha-COF can adsorb methylene blue rapidly and maintain high adsorption efficiency after several cyclic applications. The adsorption of methylene blue on M-TzDha-COF is consistent with the pseudo-second-order adsorption kinetic model and Langmuir adsorption model. Adsorption is caused by three interactions: π-π stacking between the triazine group and methylene blue, electrostatic interaction between the carboxyl group and the methylene blue cationic portion, and hydrogen bonding interaction. Fast kinetics, high adsorption capacity and good reusability make carboxyl functionalized COF have great potential in removing methylene blue dye from water.
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LANGMUIR
·
2024
·
IF 3.7
Wenshuai Jiang,Yaning Wang,Yuxi Wang,Wen Zhou,Jiefen Shen,Qingjun Liu
Nanocomposite films made from graphene oxide (GO) and MXene have a dense layered structure due to nanosheet self-stacking, limiting their dye adsorption performance. In this study, acid–base neutralization reactions are used to induce MXene/reduced graphene oxide (RGO) films bulging, which opens the stacked layer structure within the membrane and enhances MB adsorption performance. The effects of the pH, temperature, contact time, and initial concentration of MB on the adsorption performance are further investigated. The results indicate that the adsorption process conforms to the pseudo-second-order kinetic and Freundlich isotherm models and is heat-absorbing and spontaneous, and the MXene/RGO foams have an adsorption capacity of up to 1099.5 mg g–1 for MB. In addition, our study show that the MXene/RGO foams not only have better reusability, but also exhibit better adsorption for other dyes. The efficient MB removal is attributed to the increased specific surface area of the composite foams, increased active sites, strong electrostatic interactions between MB and the composite foams, as well as intercalation adsorption. These findings offer new options for solving dye effluent problems.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zuozhao Zhai,Haihua Li,Yuxuan Zheng,Yangfan Ji,Hanqing Peng,Yuhua Gao,Meifang Yan,Haitao Yu
Starch based carbon aerogel has attracted significant attention due to the wide source, environmental friendliness and low price of raw materials. Here, starch based carbon aerogel was fabricated by graft reaction and cross-linking reaction of starch. The network structure of starch hydrogel was optimized through graft and cross-linking reaction. After freeze drying and high temperature carbonization , the obtained carbon aerogel that carbonized at 800 °C showed a specific surface area of 1508 m 2 ·g −1 without activation which is far higher than that of other unactivated carbon aerogels. The starch based carbon aerogel carbonized at 800 °C exhibited superior methylene blue adsorption ability with a maximum adsorption capacity of 963.5 mg·g −1 as a result of its rich surface functional groups, high specific surface area, and reasonable pore size distribution . Furthermore, the carbon aerogel carbonized at 700 °C exhibited excellent electrochemical performance with a specific capacitance of 180.1 F·g −1 at a current density of 1 A·g −1 as electrode materials for supercapacitors . Overall, this work provides a new method to prepare high performance starch based carbon aerogel.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Shuangzhen Guo,Hongchao Xu,Fan Zhang,Xixi Zhu,Xianlong Li
A novel magnetic silica gel (Fe 3 O 4 -Si-COOH) adsorbent was successfully prepared and used to removal methylene blue (MB) from aqueous solution by adsorption method. Several techniques, including scanning electron microscope (SEM), transmission electron microscope (TEM), thermo-gravimetric analyzer (TGA), fourier transform infrared (FTIR), nitrogen physisorption and vibrating sample magnetometer (VSM), were used to characterize the adsorbent. Batch experiments were conducted to investigate the MB adsorption performance of Fe 3 O 4 -Si-COOH. The maximum adsorption efficiency of MB appeared at pH 11.0. The adsorption equilibrium was reached within 60 min and commendably described by pseudo-second-order model, and Langmuir model fitted the adsorption isotherm better. The maximum adsorption capacity can reach to 246.31 mg/g. Moreover, thermodynamic parameters including enthalpy (ΔH), free energy (ΔG) and entropy (ΔS) were also investigated and revealed that the adsorption process was spontaneous and endothermic in nature. Desorption and repeatability studies showed that Fe 3 O 4 -Si-COOH could still maintain about 76% in the fifth consecutive adsorption-regeneration cycle. Above the results showed that Fe 3 O 4 -Si-COOH was a promising adsorbent in environment pollution cleanup.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Junzheng Chen,Xikun Zhang,Xue Lv,Shurui Yi,Di Fang
In this study, the dispersion behavior of MoS₂ in ionic liquids (ILs) with varying alkyl chain lengths was the primary focus of investigation, followed by the design of a novel PAM/SMA/CMC/PDA@MoS 2 hydrogel. By optimizing the concentrations of CMC and PDA@MoS 2 , a bifunctional hydrogel with both sensing and catalytic functions was successfully developed. Mechanical tests revealed that the PAM/SMA/CMC 0.06 /0.09PDA@MoS 2 hydrogel exhibited exceptional mechanical properties, with stress (505.24 kPa), strain (2333.34 %), elastic modulus (20.17 kPa), and toughness (3990.97 kJ/m 3 ). Furthermore, the hydrogel demonstrated superior sensing performance, characterized by high sensitivity (GF = 7.67) and a rapid response time (148 ms) across a wide strain range. These properties enable precise monitoring of physiological movements, coupled with long-term cyclic stability, positioning it as a versatile material for sensors and electrodes. Subsequently, in situ stabilized silver nanoparticles (Ag NPs) were used as a template for the catalytic degradation of methylene blue (MB) using discarded human motion monitoring hydrogels. The degradation followed first-order kinetics (k = 0.54 min −1 at 25 °C) with 85 % efficiency sustained over 10 cycles, demonstrating significant stability and recyclability. This strategy integrates sensor recycling with Ag NPs based dye degradation, addressing environmental concerns and highlighting its potential in sustainable applications.
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Yazhou Guo,Yonggang Du,Guibo Liu,Yuyan Bi,Weiqiang Xu,Yahui Cui,Yulei Jia
Herein, a novel and high-performance adsorbent, polyaniline-sodium alginate (PANI–SA) hydrogel microspheres were prepared via ion cross-linking technique for adsorption and removing methylene blue (MB) dye from wastewater. The processes involved synthesizing polyaniline (PANI) with macromolecular skeleton and doping it into sodium alginate (SA) to prepare hydrogel microspheres with high specific surface area, abundant functional groups, and excellent adsorption properties. The surface morphology, crystallinity, functional groups, thermal stability, pore size distribution, and specific surface area of PANI–SA hydrogel microspheres and their components were determined by SEM, XRD, FTIR, TGA, and BET. Various parameters, including polyaniline doped concentration, solution pH, initial dye concentration, adsorption time, and temperature were systematically investigated to understand their impact on the adsorption properties of PANI–SA. The results revealed a synergistic effect between PANI and SA, with PANI–SA exhibiting exceptional efficacy (1060.78 mg/g) in removing MB from aqueous solutions. The kinetics and isotherm adsorption behaviors were aptly described by the pseudo-first-order kinetic and the Langmuir isotherm models, respectively. Thermodynamic analyses confirmed the spontaneous and exothermic nature of adsorption. Furthermore, the PANI–SA hydrogel microspheres demonstrated excellent reusability, maintaining high adsorption capacity after 5 recycling rounds. Electrostatic interactions and hydrogen bond were found to be the primary mechanisms driving the adsorption process. This study not only contributes to the development of efficient and eco-friendly adsorption materials for dye wastewater treatment but also provides insights into the design and optimization of hydrogel adsorbents.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Zheng Guo,Hekai Zhang,Yunfei Song,Yaning Zong,Peng Wei,Li Yin,Minghuan Wang
Though MOFs show potential for organic dye wastewater treatment, their practical use is limited by poor recoverability of powdered MOF-based adsorbents/catalysts. To address the recovery issues and agglomeration tendencies inherent in metal-organic framework (MOF) powders, this study presents the synthesis of ZIF-67/PAN composite nanofibers via an electrospinning technique, effectively immobilizing ZIF-67 nanoparticles onto a polyacrylonitrile (PAN) matrix. The resulting composite exhibited a high specific surface area of 663.06 m 2 /g and demonstrated exceptional dual functionality for methylene blue (MB) removal. It achieved a high adsorption capacity of 1169.23 mg/g at 45 °C and enabled ultrafast catalytic degradation, achieving 100 % MB removal within 10 min through peroxymonosulfate (PMS) activation. Density functional theory (DFT) calculations revealed that demethylation and ring-opening served as the dominant degradation pathways, facilitated by the generation of sulfate (SO 4 · - ) and hydroxyl (·OH) radicals via Co 2+ /Co 3+ redox cycling. The composite material demonstrated outstanding pH resilience across a broad range (pH 3–9) and significantly reduced the ecotoxicity of degradation intermediates. Furthermore, the ZIF-67/PAN fibers exhibited excellent reusability, maintaining high performance over five consecutive cycles with an efficiency loss of less than 8 %. This work provides a robust, scalable, and environmentally friendly strategy for industrial dyeing wastewater treatment.
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 5
·1-15
·
IF 2.4
Liu Tao,Zhou Guangming,Yu Bingyan,Fu Lihu,Yu Simiao,Xu Zhenjie,Lu Gang
To address the problem of dye wastewater pollution, hierarchical porous alumina ceramics (HPAC) were prepared as carriers in this study by using digital light processing (DLP) 3D printing combined with the freeze-drying method. The results showed that the hierarchical porous alumina ceramics with a porogenic agent content of 33 wt% exhibited the highest porosity of 34.20% ± 1.22% and a pore size of 2–5 nm. An efficient photocatalytic system was constructed by loading nickel oxide nanoparticles (n-NiO) via the sol-gel method. The prepared photocatalytic carriers and photocatalysts were characterized for structural and morphological analysis using X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analyzer, and energy-dispersive X-ray fluorescence spectroscopy (EDS). The results indicated that n-NiO/HPAC with 15.43% NiO loading achieved optimal performance in methylene blue (MB) degradation experiments, with the MB degradation rate reaching 94.51%. This study provides a theoretical basis and technical support for the practical application of porous-material-loaded n-NiO photocatalysts in dye wastewater treatment. Graphical abstract
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ANALYST
·
2025
·
IF 3.3
Nan Lin,Xiao Han,Shuo Tian,Dianping Tang,Danfeng Zhang
Interleukin-6 (IL-6) protects neurons by inhibiting the expression of factors related to neuronal injury in nervous headache patients. The development of rapid and sensitive IL-6 detection methods are very advantageous for easing the pain of the patients. In this work, an immobilization-free immunodetection method is explored for the voltammetric screening of IL-6 in serum samples from nervous headache patients. Initially, methylene blue-encapsulated liposome (MBLS) labeled with anti-IL-6 detection antibodies are confined into anti-IL-6 capture antibody-coated microplate through a sandwich-type immunoreaction, and subsequently subject to lysis treatment. After that, the lytic solution is transferred into a detection cell including Nafion-modified working electrode. Methylene blue molecules with positive charge are captured onto the negatively charged Nafion membrane, thus generating a voltammetric signal. The voltammetric peak currents are relative to the IL-6 amount in the solution. At the optimized experimental situations, MBLS-based split-type electrochemical sensing protocols have acceptable voltammetric currents for IL-6 from 0.01 to 100 pg mL-1, and allow screening of IL-6 as low as a concentration of 9.1 fg mL-1. The batch-to-batch coefficients of variation were ≤11.95%. A good anti-interference capability was acquired against other biomolecules. Seven human serum specimens and two diluted serum samples including IL-6 obtained from nervous headache patients were determined by MBLS-based electrochemical immunoassay, and achieved well-matched results in comparison with those of IL-6 ELISA protocol.
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Gels
·
2025
·Vol. 11
·期 4
·252
·
IF 5.3
Yanan Wang,Yanan Lu,Hao Zhong,Minghui Guo,Jingkui Li
To solve the problem of dye contamination caused by methylene blue (MB), a one-step synthesised nanocellulose (CNF) and polyacrylamide (PAM) gel network was modified by using NaOH in this study, and the prepared samples were analysed for their micromorphology, chemical structure, and adsorption-release properties. The findings demonstrated that the maximum adsorption capacity of the CNF-PAM5% was 172.08 mg/g, which followed the quasi-second-order kinetic model and the Freundlich adsorption model. The adsorption of the gel increased with the increase of the NaOH-modified concentration. However, the adsorption efficiency of the CNF-PAM5% could still reach 85% after four cycles, and the CNF-PAM5% remained intact without signs of fragmentation after 4 h of stirring and water impact, which was attributed to the introduction of CNF into the PAM network to effectively improve the mechanical properties of the gel. Moreover, toxicity tests showed no significant difference in the amount of cellular activity, even when the volume of the CNF-PAM5% sample was increased up to 10-fold. This gel, which exhibits low toxicity and excellent recycling properties, serves to reduce environmental impact during the adsorption process. Furthermore, the potential exists for utilising the gel’s methylene blue-releasing (MB) properties as a fungicide for fish.
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ChemistrySelect
·
2025
·Vol. 10
·期 16
·e202500510
·
IF 2
Junfei Fang,Hang Yang,Lei Liu,Yuchun Gou,Jianping Deng
Graphical The catalytic and photocatalytic performance of the Copper sulfide (CuS) products prepared by using different copper sources are respectively studied. The catalytic performance of the CuS sample prepared via CuCl 2 as copper source is the best, and when H 2 O 2 is added to form a photo-Fenton catalytic system, it has excellent degradation ability for MB in both dark and light irradiation environments. Copper sulfide (CuS) is a p-type semiconductor material with narrow band gap and easy to be excited by visible light, which makes it has broad application prospect in the field of organic pollutant treatment. This work provides some significant insights into the photo-Fenton catalytic performance of the CuS materials in the degradation of organic dye MB. Via changing the copper source, the catalytic and photocatalytic performances of the CuS products prepared by using different copper sources such as CuSO 4 , Cu(NO 3 ) 2 , CuCl 2 , Cu(C 2 H 3 O 2 ) 2 were studied. The results indicated that due to the difference of copper sources, the catalytic performance of the obtained CuS samples varied greatly. For example, the catalytic properties of the CuS specimens prepared via CuCl 2 and CuSO 4 were significantly better than those of the products prepared using Cu(C 2 H 3 O 2 ) 2 and Cu(NO 3 ) 2 . Meanwhile, the degradation performance of MB by the same CuS specimen is better in a light irradiation condition than in a dark environment. Specifically, the catalytic performance of the CuS sample prepared via CuCl 2 as copper source was the best, and when H 2 O 2 was added to form a photo-Fenton catalytic system, it has excellent degradation ability for MB in both dark and light irradiation environments.
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Desalination and Water Treatment
·
2015
·
IF 1.173
Ling Li,Li Jun Yuan,Wei Hong,Lu Fan,Le Bao Mao,Li Liu
The adsorptions of methylene blue (MB) and methyl violet (MV) from an aqueous solution of Fe3O4/metal-organic frameworks (MOFs) composite were studied in view of the adsorption isotherm, kinetics and regenerate of the sorbent. The adsorption isotherms of MB and MV on Fe3O4/MOFs composite both followed the Langmuir isotherm. Adsorption kinetics were determined from the experimental data. The used Fe3O4/MOFs could be regenerated by acetonitrile, so it can be recycled for use. The excellent adsorption effect and reusability make Fe3O4/MOFs attractive for the removal of MB and MV from aqueous solution. The feasibility of Fe3O4/MOFs for application in magnetic solid-phase extraction was examined.
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