1
|
Liu F, Fan M, Liu X, Chen J. One-Pot Synthesis of Cellulose-Based Carbon Aerogel Loaded with TiO 2 and g-C 3N 4 and Its Photocatalytic Degradation of Rhodamine B. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:1141. [PMID: 38998746 PMCID: PMC11243333 DOI: 10.3390/nano14131141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Revised: 06/25/2024] [Accepted: 07/01/2024] [Indexed: 07/14/2024]
Abstract
A cellulose-based carbon aerogel (CTN) loaded with titanium dioxide (TiO2) and graphitic carbon nitride (g-C3N4) was prepared using sol-gel, freeze-drying, and high-temperature carbonization methods. The formation of the sol-gel was carried out through a one-pot method using refining papermaking pulp, tetrabutyl titanate, and urea as raw materials and hectorite as a cross-linking and reinforcing agent. Due to the cross-linking ability of hectorite, the carbonized aerogel maintained a porous structure and had a large specific surface area with low density (0.0209 g/cm3). The analysis of XRD, XPS, and Raman spectra revealed that the titanium dioxide (TiO2) and graphitic carbon nitride (g-C3N4) were uniformly distributed in the CTN, while TEM and SEM observations demonstrated the uniformly distributed three-dimensional porous structure of CTN. The photocatalytic activity of the CTN was determined according to its ability to degrade rhodamine B. The removal rate reached 89% under visible light after 120 min. In addition, the CTN was still stable after five reuse cycles. The proposed catalyst exhibits excellent photocatalytic performance under visible light conditions.
Collapse
Affiliation(s)
| | | | | | - Jinyang Chen
- School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China; (F.L.)
| |
Collapse
|
2
|
Gorgolis G, Kotsidi M, Paterakis G, Koutroumanis N, Tsakonas C, Galiotis C. Graphene aerogels as efficient adsorbers of water pollutants and their effect of drying methods. Sci Rep 2024; 14:8029. [PMID: 38580774 PMCID: PMC10997784 DOI: 10.1038/s41598-024-58651-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 04/02/2024] [Indexed: 04/07/2024] Open
Abstract
Environmental accidents highlight the need for the development of efficient materials that can be employed to eliminate pollutants including crude oil and its derivatives, as well as toxic organic solvents. In recent years, a wide variety of advanced materials has been investigated to assist in the purification process of environmentally compromised regions, with the principal contestants being graphene-based structures. This study describes the synthesis of graphene aerogels with two methods and determines their efficiency as adsorbents of several water pollutants. The main difference between the two synthesis routes is the use of freeze-drying in the first case, and ambient pressure drying in the latter. Raman spectroscopy, Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS) and contact angle measurements are employed here for the characterisation of the samples. The as-prepared aerogels have been found to act as photocatalysts of aqueous dye solutions like methylene blue and Orange G, while they were also evaluated as adsorbents of organic solvents (acetone, ethanol and methanol), and, oils like pump oil, castor oil, silicone oil, as well. The results presented here show that the freeze-drying approach provides materials with better adsorption efficiency for the most of the examined pollutants, however, the energy and cost-saving advantages of ambient-pressure-drying could offset the adsorption advantages of the former case.
Collapse
Affiliation(s)
- G Gorgolis
- Department of Chemical Engineering, University of Patras, 26504, Patras, Greece.
- Foundation for Research and Technology - Hellas (FORTH/ ICE-HT), Institute of Chemical Engineering Sciences, 26504, Patras, Greece.
| | - M Kotsidi
- Department of Chemical Engineering, University of Patras, 26504, Patras, Greece
| | - G Paterakis
- Department of Chemical Engineering, University of Patras, 26504, Patras, Greece
- Foundation for Research and Technology - Hellas (FORTH/ ICE-HT), Institute of Chemical Engineering Sciences, 26504, Patras, Greece
| | - N Koutroumanis
- Foundation for Research and Technology - Hellas (FORTH/ ICE-HT), Institute of Chemical Engineering Sciences, 26504, Patras, Greece
| | - C Tsakonas
- Foundation for Research and Technology - Hellas (FORTH/ ICE-HT), Institute of Chemical Engineering Sciences, 26504, Patras, Greece
| | - C Galiotis
- Department of Chemical Engineering, University of Patras, 26504, Patras, Greece.
- Foundation for Research and Technology - Hellas (FORTH/ ICE-HT), Institute of Chemical Engineering Sciences, 26504, Patras, Greece.
| |
Collapse
|
3
|
Zhai Z, Wang S, Xu Y, Zhang L, Wang X, Yu H, Ren B. Starch-based carbon aerogels prepared by an innovative KOH activation method for supercapacitors. Int J Biol Macromol 2024; 257:128587. [PMID: 38065463 DOI: 10.1016/j.ijbiomac.2023.128587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/24/2023] [Accepted: 12/01/2023] [Indexed: 01/26/2024]
Abstract
Biomass-based carbon aerogels hold promising application prospect in the field of supercapacitors. In this research, starch was selected as a raw material for preparing carbon aerogels. The preparation process of starch hydrogels was simplified by using KOH, which can change starch suspension into hydrogels at room temperature. Moreover, the molecular mixing of KOH and starch was realized, so that KOH can be fully utilized in the activation process. The specific surface area of the starch-based carbon aerogels prepared by this method was 1349 m2/g, and the proportion of micropores was 43.7 %. Remarkably, as electrode materials for supercapacitors, the starch-based carbon aerogels exhibited outstanding electrochemical performance. In a three-electrode system, the carbon aerogels exhibited specific capacitance of 211.5 F/g at 0.5 A/g and 138.5 F/g at 10 A/g, suggesting their suitability for high-current applications. In a symmetrical supercapacitor configuration, the materials exhibited an energy density of 11.3 Wh/kg at a power density of 0.5 kW/kg and the specific capacitance can maintain 98.91 % after 10,000 cycles. Overall, this work provides a new method for mixing activators, which will foster potential advances in starch based carbon aerogels.
Collapse
Affiliation(s)
- Zuozhao Zhai
- Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, Hebei 050024, China; Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang, Hebei 050081, China
| | - Shasha Wang
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang, Hebei 050081, China
| | - Yuelong Xu
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang, Hebei 050081, China
| | - Lihui Zhang
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang, Hebei 050081, China
| | - Xiaolei Wang
- Hebei Yuehai Water Co., Ltd., Shijiazhuang, Hebei 050081, China
| | - Haitao Yu
- Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, Hebei 050024, China.
| | - Bin Ren
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang, Hebei 050081, China
| |
Collapse
|
4
|
Growth inhibition of bacterial pathogens by photo-catalyst process of nano-alloys FeCuNi doped TiO 2 under ultraviolet irradiation. Heliyon 2022; 8:e10611. [PMID: 36158092 PMCID: PMC9489971 DOI: 10.1016/j.heliyon.2022.e10611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/02/2022] [Accepted: 09/07/2022] [Indexed: 11/22/2022] Open
Abstract
This study reports the application of FeCuNi nano-alloy doped TiO2 synthesized via the sol-gel method as an antibacterial with a sterilization rate greater than 95% under ultra-violet (UV) irradiation. The performance was characterized using X-ray diffraction (XRD), thermal analysis (TG-DTA), scanning electron microscope (SEM-EDX), and transmission electron microscope (TEM). The results showed that the sterilization process of FeCuNi–TiO2 in cell suspension of Escherichia coli, Staphylococcus aureus and Bacillus subtilis increased the effectiveness of UV irradiation at wavelength (λ) ≥ 385 nm after 120 min. The optimum growth inhibition of FeCuNi–TiO2 was observed in the concentrations 1.5 g/L of E. coli, 1.5 g/L of S. aureus and 2.0 g/L of B. subtilis. The highest antimicrobial efficiency of FeCuNi–TiO2 powder was provided by a particle size of 16.8 nm, surface area of 70.98 m2/g. The increased antimicrobial activity in multiplied-three doped ions was related to the increase of illumination energy of UV absorption in the photo-catalyst process. The inhibition mechanism reaction of the three species of bacteria cell affects the lipid peroxidation process at the microbe cell’s wall. This was indicated by the formation of malondialdehyde (MDA). Lipid oxidation was based on the reaction of 2-thiobarbituric acid (TBARS) as an indicator of primary and secondary oxidation.
Collapse
|
5
|
Abstract
In the present study, TiO2-montmorillonite (MMT) composites were synthesized hydrothermally under variable conditions, including the TiO2/MMT mass ratio, reaction pH, reaction temperature, and dwelling time. These samples were determined by X-ray photoelectron spectrometry (XPS), ultraviolet–visible spectroscopy% (UV-Vis DRS), electrochemical impedance spectroscopy (EIS), transient photocurrent responses, photoluminescence (PL) spectra, electron paramagnetic resonance (EPR), and N2 adsorption–desorption isotherms. The photocatalytic activity was evaluated as the ability to promote the visible-light-driven degradation of 30 mg/L of aqueous methylene blue, which was maximized for the composite with a TiO2 mass ratio of 30 wt% prepared at a pH of 6, a reaction temperature of 160 °C, and a dwelling time of 24 h (denoted as 30%-TM), which achieved a methylene blue removal efficiency of 95.6%, which was 4.9 times higher than that of pure TiO2. The unit cell volume and crystallite size of 30%-TM were 92.43 Å3 and 9.28 nm, respectively, with a relatively uniform distribution of TiO2 particles on the MMT’s surface. In addition, 30%-TM had a large specific surface area, a strong light absorption capacity, and a high Ti3+ content among the studied catalysts. Thus, the present study provides a basis for the synthesis of composites with controlled structures.
Collapse
|
6
|
Anucha CB, Altin I, Bacaksiz E, Stathopoulos VN. Titanium Dioxide (TiO₂)-Based Photocatalyst Materials Activity Enhancement for Contaminants of Emerging Concern (CECs) Degradation: In the Light of Modification Strategies. CHEMICAL ENGINEERING JOURNAL ADVANCES 2022. [DOI: 10.1016/j.ceja.2022.100262] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
|
7
|
Cui C, Lai X, Guo R, Ren E, Qin W, Liu L, Zhou M, Xiao H. Waste paper-based carbon aerogel supported ZIF-67 derived hollow NiCo phosphate nanocages for electrocatalytic oxygen evolution reaction. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.139076] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
8
|
Fe-TiO2/AC and Co-TiO2/AC Composites: Novel Photocatalysts Prepared from Waste Streams for the Efficient Removal and Photocatalytic Degradation of Cibacron Yellow F-4G Dye. Catalysts 2021. [DOI: 10.3390/catal11101137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Fe-TiO2/AC and Co-TiO2/AC composites were prepared from activated carbon (AC) derived from residues of peanut hulls and TiO2 photocatalyst, electrochemically prepared from titanium scrap, and doped with Fe and Co, respectively. The adsorption capacity and photocatalytic activity of the Fe-TiO2/AC and Co-TiO2/AC composites were studied for removing and degrading Cibacron Yellow F-4G (CYF-4G) from wastewater. Doped ACs were characterized by thermogravimetry (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), a new X-ray absorption technique (XRA), and elemental analysis (EA). Interesting relationships were found between SEM, XRA, and TGA data and the doped amount of catalyst on ACs. Optimal dye adsorption was found at a pH of 2.0. The CYF-4G adsorption kinetics are followed according to the pseudo-second order model. The experimental data revealed that the Langmuir model fits better than the Freundlich and Temkin models. A decrease in adsorption capacity was observed when the catalyst dope percentage increased. A removal and degradation efficiency of the dye close to 100% was achieved around 120 min. A synergistic adsorption and photocatalytic degradation effect of the Fe-TiO2/AC and Co-TiO2/AC composites could be observed when adsorption experiments were conducted under simulated visible radiation.
Collapse
|