Scientific Reports
·
2025
·Vol. 15
·期 1
·1-12
·
IF 3.9
Nguyen Van Nhat,Nguyen An-Giang,Phung Thi Viet Bac,Nguyen Phi Long
Carbon-based supercapacitor electrodes derived from biomass have recently garnered significant attention due to their low cost, natural abundance, and environmental sustainability. In this study, charcoal was pretreated using a simple ultrasonic method and was employed as the active electrode material in both three-electrode and symmetric supercapacitor configurations. To further enhance electrochemical performance, a sustainable and dual-functional strategy was implemented by introducing methylene blue, a redox-active additive, into an aqueous sodium chloride electrolyte. Structural and morphological characterizations revealed that charcoal possessed a highly porous architecture with preserved plant-based vascular channels, facilitating efficient electrolyte penetration and ion transport. Electrochemical analyses demonstrated that the incorporation of methylene blue significantly enhanced charge storage through a synergistic combination of electric double-layer capacitance and pseudocapacitive behavior. The optimal device, utilizing the MB35 electrolyte composition, delivered a high specific capacitance of 212.23 F g –1 at 0.5 A g –1 , an energy density of 15.34 Wh kg –1 at a power density of 350 W kg –1 , and excellent cycling stability, retaining 91.3% of its initial capacitance after 2000 cycles and 84.3% after 5000 cycles at the high loading mass of 2 mg cm − 2 . This work presents a cost-effective route for fabricating high-performance biomass-derived supercapacitors while offering a novel approach for the reutilization of dye pollutants in sustainable energy storage applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2024
·
IF 3.5
Zhao Yuhong,Gong Zhuhua,Zhang Qi,Lu Hongjia,Liao Qinhong,Tang Jianmin,Zhang Wenlin
Enoki mushroom residue-derived porous carbon (EMRPC) was prepared using a simple ZnCl 2 activation method. Scanning electron microscopy, Thermogravimetric analysis, N 2 adsorption–desorption tests, X-ray diffraction, Raman spectroscopy, and Fourier-transform infrared spectroscopy were used to analyse the morphology, structure, and chemical composition of EMRPC. The effects of solution pH, initial dye concentration, adsorption time, and temperature on the adsorption of methylene blue (MB) dye by EMRPC and the recycling performance of EMRPC were investigated. The results demonstrated that EMRPC presented remarkable porosity and abundant surface groups. Moreover, the adsorption capacity of EMRPC for MB reached 437.5 mg g − 1 . The solution pH, initial MB concentration, adsorption time, and temperature affected the adsorption performance of EMRPC. The MB adsorption data fitted the pseudo-second-order kinetics and Freundlich isotherm models. The removal rate of MB exceeded 99.86% after five adsorption cycles, indicating the good recyclability of EMRPC. The as-prepared EMRPC exhibited excellent structure and adsorption performance. Therefore, it can be used as a high-quality adsorbent for MB removal.
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yufen Gu,Bobo Guo,Zao Yi,Xianwen Wu,Jiao Zhang,Hua Yang
One decisive factor for the photocatalytic performance of ZnSn(OH) 6 (ZSO) is nanoparticle morphology. However, the mechanism of the well-defined morphology preparation remains unknown, which leads to the systematic investigation of various parameters in the hydrothermal method . Here, shell-like hollow Archimedean ZSO nanocubes were prepared by a hydrothermal method under suitable conditions, with a uniform particle size distribution and superior dispersion. The effects of hydrothermal time, temperature, pH and surfactant on the microscopic morphology and photocatalytic degradation of methylene blue (MB) dye were investigated. The enhanced photodegradation efficiencies ( η ) of MB were 97.7%, 96.3%, 89.6%, and 96.2% for 8 h-ZSO, 120 ℃-ZSO, 2.85-ZSO, and Hexadecyl trimethyl ammonium Bromide-ZSO (CTAB-ZSO), respectively, which strongly depended on the morphology, leading to differences in physicochemical properties, such as bandgap and charge transfer resistance. The results suggested that a single change in hydrothermal time, temperature, pH, or surfactant can effectively improve the microscopic morphology and photocatalytic performance of ZSO, which may pave the way for the ingenious design of other high-performance photocatalysts . A growth mechanism was proposed for shell-like hollow ZSO prepared in an alkaline environment.
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2015
·Vol. 58
·期 10
·1593-1599
·
IF 1.695
He Yayun,Ding Longhua,Su Bin
Silica mesochannels (SMCs) vertically and regularly oriented to the surface of indium tin oxide (ITO) electrodes were prepared and utilized for preconcentration and detection of methylene blue (MB) in aqueous solution. The positively charged MB can be adsorbed to the SMCs by following the pseudo-first-order kinetic model. The negative value of Δ G =−34.73 kJ/mol derived from the Langmuir adsorption isotherm indicated the thermodynamic feasibility of the adsorption and the spontaneous nature of the process. Moreover, the adsorbed MB can undergo an electrochemical reaction on the ITO electrode at a suitable potential and the resulting electrical current can be utilized to quantify the MB in aqueous solution. A good analytical performance for MB with a linear range from 10 nmol/L to 1.0 μmol/L and a detection limit at the nmol/L level was obtained. We believe that such a platform consisting of SMCs perpendicularly tethered to the underlying electrode surface simultaneously allows enrichment and electrochemical detection and can be extended for the detection of various charged dyes, as well as many other charged species.
✓ 已验证
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 3
·297
·
IF 4.501
Dingqing Yang,Jinyang Chen,Xiaomin Hong,Jingying Cui,Lingzhen Li
TiO2/hectorite composite photocatalysts with different molar ratios of lithium, magnesium, and silicon were synthesized by a one-pot hydrothermal method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), N2adsorption-desorption isotherms, and ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS). When the molar ratio of lithium, magnesium, and silicon was 1.32:5.34:8 (TH-2), the composite showed the highest UV photocatalytic degradation of methylene blue (MB). The apparent rate constant of TH-2 was 0.04361 min−1, which was about 3.12 times that of EVONIK Degussa commercial TiO2of AEROXIDE P25. The improvement of photocatalytic efficiency of the composite was mainly due to its high specific surface area, light trapping ability, and effective separation of electrons (e−) and holes (h+). At the same time, the F element of hectorite is beneficial to the formation of Ti3+in TiO2, thus enhancing the photocatalytic activity. After five cycles, the removal rate of MB with TH-2 still reached 87.9%, indicating its excellent reusability.Keywords:photocatalysis;TiO2;hectorite;one-pot synthesis;degradation of organic dyes
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 30
·41268-41282
·
IF 4.223
Song Guobin,Li Anqi,Shi Yawei,Li Wanran,Wang Haonan,Wang Chunchao,Li Ruijuan,Ding Guanghui
In the present study, five magnetic multi-walled carbon nanotubes (MMWCNTs) with different diameters were prepared and their performance on the sorptive removal of methylene blue (MB) from water was investigated. Transmission electron microscope, scanning electron microscope, Fourier transform infrared spectrometer, X-ray diffraction, and vibrating sample magnetometer confirm that the surface of these MMWCNTs has been decorated by Fe 3 O 4 nanoparticles, which renders the MMWCNTs superparamagnetic. Thus, these MMWCNTs can be easily separated from water after the adsorption. During the adsorption process, pH slightly affected the removal efficiency of MB and the adsorption performed better under weak alkaline conditions. Adsorption kinetics followed the pseudo-second-order kinetic model well, and the Dubinin-Radushkevich model fitted the isotherms best. The maximum adsorption capacity for MB reached 204.2 mg/g, and the values decreased with increasing diameters of MMWCNTs due to decreasing specific surface areas. The thermodynamics parameters indicated the spontaneous and exothermic nature of the adsorption. The reusability test showed that MMWCNTs could be used for 6 cycles without significant loss of the adsorption capacity. And common ions (K + , Na + , Ca 2+ and Al 3+ ) and SDS in water did not show greatly effects on the removal efficiency of MB. Hence, MMWCNTs prepared in this study could be promising adsorbents for dyes removal from wastewater.
✓ 已验证
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Yuling Yang,Zhenqin Lai
A new ferrocene-based porous organic polymer (named FcTz-POP) was rationally designed and synthesized. With abundant ferrocene and triazine blocks, FcTz-POP is a versatile functional material that with porous structure, high electron density and excellent stability. UV–Vis absorption spectra showed FcTz-POP exhibited a significant coverage of the solar irradiance spectrum. Photocatalytic experiments proved that FcTz-POP was highly efficient for methylene blue (MB) degradation under visible light irradiation at neutral pH. The effects of the initial MB, H 2 O 2 concentrations, pH value and ion strength on MB degradation were studied. The catalytic mechanism of FcTz-POP was also proposed. In addition, FcTz-POP possessed an outstanding and reversible adsorption ability for iodine vapor with the uptake value of 2.64 g g −1 because of the strong charge-transfer interaction between the polymer and iodine molecules. These results may provide a guidance for the design of novel POPs for photocatalytic degradation of organic dyes and harmful volatile substances capture.
✓ 已验证
DOI
高影响因子
NANO
·
2025
·
IF 1.1
Yi Gou,Jinghong Du,Zilong Wang,Shengyang He,Jiahao Lv
La 3+ single-doped and La 3+ -Mo 6+ co-doped TiO 2 nanotubes were synthesized via anodic oxidation combined with a two-step electrochemical process. Their crystalline structure, microstructure, and light absorption properties were characterized using XRD, SEM, and UV-Vis spectroscopy, followed by methylene blue photocatalytic degradation experiments. The results indicate that both La 3+ single-doping and La 3+ -Mo 6+ co-doping can suppress the transformation of the anatase phase to the rutile phase and inhibit grain growth. The diameters of both types of nanotubes range between 60-80 nm, with La and Mo uniformly distributed throughout the nanotubes. Both La 3+ single-doped and La 3+ -Mo 6+ co-doped induced red shifts in the TiO 2 light absorption peaks. The most pronounced red shift in the light absorption band edges occurred at a La 3+ -Mo 6+ ratio of 3:7, reducing the bandgap width to its minimum value of 2.99 eV. Both La 3+ single-doped and La 3+ -Mo 6+ co-doped TiO 2 exhibited first-order photocatalytic degradation of methylene blue. As the La 3+ single-doped concentration increased or the La 3+ -Mo 6+ co-doped ratio varied from 1:9 to 9:1, both the methylene blue degradation rate and photocatalytic reaction rate initially increased before decreasing, while the half-life initially decreased before increasing. At a La 3+ -Mo 6+ co-doped ratio of 3:7, the photocatalytic activity of the TiO 2 nanotubes was optimal, achieving a maximum degradation rate of 89.73% within 8 hours-a 52% improvement over pure TiO 2 nanotubes.
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 28
·期 1
·273-288
·
IF 4.21
Lu Beili,Lin Qiang,Yin Zhu,Lin Fengcai,Chen Xuerong,Huang Biao
Robust and ultralight biofoams had been successfully prepared using readily available and biocompatible cellulose nanofibrils (CNFs) as the matrix. The γ-glycidoxypropyltrimethoxysilane (GPTMS) was first added into the CNFs suspension to act as a crosslinker to form covalent linkages between cellulose chains. Then the gelatin was incorporated into the networks via reacting with the epoxy groups on GPTMS and forming hydrogen bonding with CNFs. The content of gelatin had a significant influence on the properties of the obtained foams. With the introduction of a small amount of gelatin, the foams exhibited significantly enhanced mechanical properties and stability in water in comparison with the CNF foams without GPTMS and/or gelatin. The foams containing the appropriate ratio of gelatin to CNFs possessed the high porosity (99.16%), ultralow density (0.0077 g/cm 3 ), good mechanical properties, and abundant functional groups (hydroxyl and carboxylate groups). These features made it an ideal adsorbent toward methylene blue (MB) and the maximum adsorption capacity could reach up to 430.33 mg/g. Additionally, the cationic MB could be removed from the mixed cationic/anionic dye solutions with high selectivity, possibly due to the strong electrostatic interactions between MB and the adsorbent. Furthermore, the recycling test demonstrated the good reusability of this biofoam. Therefore, this work provides an environmentally benign method to fabricate robust CNF-based foams, which can be considered as green adsorbents for the treatment of water pollutants.
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Xin Jiang,Hongying Xia,Libo Zhang,Song Cheng,Qi Zhang,Quan Chen,Wenhai Hu
To enhance the photocatalytic performance of Cu 2 O, the spent activated carbon (SAC) directly supported CuO powder and then was heated by microwaves to prepare an economical photocatalyst copper-loaded activated carbon (Cu/AC). The prepared Cu/AC catalyst was characterized by N 2 adsorption-desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and the zero charge point (pH pzc ). The analysis results indicated that Cu/AC had an important specific surface area of 1135 m 2 /g and mainly contained Cu 2 O and metallic copper (Cu 0 ). The Cu 2 O particles were successfully loaded on the activated carbon. The photocatalytic activity of prepared Cu/AC was evaluated by means of methylene blue (MB) degradation. The effects of reaction parameters such as the pH, initial concentration and dose of Cu/AC were investigated for dye degradation . The data showed that the MB solutions were degraded using Cu/AC under UV irradiation . These results indicated that the Cu/AC photocatalyst may be conceived as a method for the treatment of dye wastewater.
✓ 已验证
DOI
高影响因子
ANALYST
·
2010
·Vol. 135
·期 11
·2960-2964
·
IF 3.272
Zhanxia Zhang,Xiaolei Wang,Yong Wang,Xiurong Yang
A simple and sensitive approach for the recognition of single base mismatches in duplex DNA was developed. The single base mismatched double-strand (ds) DNA and the completely complementary dsDNA can quench the fluorescence of methylene blue to the different values, so the point mutation dsDNA can be identified from the duplex DNA effectively. The fluorescence intensity was decreased with the increasing dsDNA concentration in the range of 10∼1000 nM, the detection limit was estimated to be 50 nM (S/N = 3). The contrast experiment showed that this method possesses the universality for the distinction of other single base mismatches in duplex DNA. Moreover, the interaction mechanism between methylene blue and dsDNA was also discussed in detail. The UV-Visible absorption and the fluorescence experiments indicated that the interaction of methylene blue and dsDNA had at least two effective modes: the electrostatic binding and the intercalation binding. When more methylene blue molecules bound onto mismatched dsDNA, the fluorescence intensity of methylene blue would decrease to a lower value than that of completely complementary dsDNA. Therefore, single base mismatched dsDNA can be recognized from duplex DNA effectively.
✓ 已验证
DOI
PubMed
高影响因子
Science China-Materials
·
2021
·Vol. 64
·期 9
·2325-2336
·
IF 8.273
Xu Ning,Gu Quanyong,Du Jianjun,Ge Haoying,Long Saran,Sun Wen,Fan Jiangli,Peng Xiaojun
Photodynamic therapy (PDT) is a treatment that uses light-sensitive drugs and a light source to destroy cancer cells. Methylene blue (MB) is an efficient photosensitizing agent that has been widely used in PDT. However, MB suffers from the hypochromic effect that is caused by self-aggregation and DNA binding in vivo . It is also easily reduced to ineffective leucomethylene blue in the hypoxic environments surrounding solid tumors. In this work, we prepared MB carbon dots (MB-CDs) using MB as the carbon source. The MB-CDs not only inherit the PDT capabilities of MB, but also demonstrate good biocompatibility and low toxicity. Importantly, MB-CDs demonstrate excellent resistance to interference from reduction, aggregation, and DNA interactions. The MB-CDs exhibited satisfactory PDT activities both in vitro and in vivo . The tumor sizes were reduced to below 20% of their original volumes when irradiated by a 590-nm light-emitting diode source.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）