1
|
Structure and Magnetic Properties of AO and LiFePO 4/C Composites by Sol-Gel Combustion Method. Molecules 2023; 28:molecules28041970. [PMID: 36838958 PMCID: PMC9962871 DOI: 10.3390/molecules28041970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/13/2023] [Accepted: 02/16/2023] [Indexed: 02/22/2023] Open
Abstract
LiFePO4 takes advantage of structure stability, safety and environmental friendliness, and has been favored by the majority of scientific researchers. In order to further improve the properties of LiFePO4, AO-type metal oxides (MgO and ZnO) and LiFePO4/C composites were successfully prepared by a two-step sol-gel method. The effects of AO-type metal oxides (MgO and ZnO) on LiFePO4/C composites were studied. TG, XRD, FTIR, SEM and VSM analysis showed that the final product of the MgO and LiFePO4/C composite was about 70.5% of the total mass of the precursor; the complete main diffraction peak of LiFePO4 and MgO can be found without obvious impurity at the diffraction peak; there is good micro granularity and dispersion; the particle size is mainly 300 nm; the saturation magnetization (Ms), the residual magnetization (Mr) and the area of hysteresis loop are increased with the increase in MgO content; and the maximum Ms is 11.11 emu/g. The final product of ZnO and LiFePO4/C composites is about 69% of the total mass of precursors; the complete main diffraction peak of LiFePO4 and ZnO can be found without obvious impurity at the diffraction peak; there is good micro granularity and dispersion; the particle size is mainly 400 nm; and the coercivity (Hc) first slightly increases and then gradually decreases with the increase of zinc oxide.
Collapse
|
2
|
Wai HS, Li C. Fabrication of Well-Aligned ZnO Nanorods with Different Reaction Times by Chemical Bath Deposition Method Applying for Photocatalysis Application. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28010397. [PMID: 36615591 PMCID: PMC9822363 DOI: 10.3390/molecules28010397] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/22/2022] [Accepted: 12/30/2022] [Indexed: 01/04/2023]
Abstract
Zinc oxide nanorods were grown on an aluminum-doped zinc oxide seeds layer using the chemical bath deposition method. The effects of growth reaction time on the structural, optical, and photocatalytic properties of zinc oxide nanorods were investigated. It was clearly observed that the growth direction of zinc oxide nanorods were dependent on the crystallinity of the as-deposited aluminum-doped zinc oxide seed layer. The crystallinity of the obtained zinc oxide nanorods was improved with the increase in reaction times during the chemical bath deposition process. The mechanism of zinc oxide nanorod growth revealed that the growth rate of nanorods was influenced by the reaction times. With increasing reaction times, there were much more formed zinc oxide crystalline stacked growth along the c-axis orientation resulting in an increase in the length of nanorods. The longest nanorods and the high crystallinity were obtained from the zinc oxide nanorods grown within 5 h. The optical transmittance of all zinc oxide nanorods was greater than 70% in the visible region. Zinc oxide nanorods grown for 5 h showed the highest degradation efficiency of methyl red under ultraviolet light and had a high first-order degradation rate of 0.0051 min-1. The photocatalytic mechanism was revealed as well.
Collapse
Affiliation(s)
- Htet Su Wai
- School of Systems Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosayamada cho, Kami City 782-8502, Kochi, Japan
| | - Chaoyang Li
- School of Systems Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosayamada cho, Kami City 782-8502, Kochi, Japan
- Center of Nanotechnology, Kochi University of Technology, 185 Miyanokuchi, Tosayamada cho, Kami City 782-8502, Kochi, Japan
- Correspondence: ; Tel.: +81-887-57-2106
| |
Collapse
|
3
|
Morsy M, Abdel-Salam AI, Gomaa I, Moustafa H, Kalil H, Helal A. Highly Efficient Photocatalysts for Methylene Blue Degradation Based on a Platform of Deposited GO-ZnO Nanoparticles on Polyurethane Foam. MOLECULES (BASEL, SWITZERLAND) 2022; 28:molecules28010108. [PMID: 36615302 PMCID: PMC9822506 DOI: 10.3390/molecules28010108] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/16/2022] [Accepted: 12/21/2022] [Indexed: 12/24/2022]
Abstract
The demand for reactive dyes in industries has increased rapidly in recent years, and producing a large quantity of dye-containing effluent waste contaminates soils and water streams. Current efforts to remove these harmful dyes have focused on utilizing functionalized nanomaterials. A 3D polyurethane foam loaded with reduced graphene oxide (rGO) and ZnO nanocomposite (PUF/rGO/ZnO) has been proposed as an efficient structural design for dye degradation under the influence of visible light. The proposed structure was synthesized using a hydrothermal route followed by microwave irradiation. The resultant 3D PUF/rGO/ZnO was examined and characterized by various techniques such as XRD, FTIR, SEM, EDAX, BET, and UV-visible spectroscopy. SEM data illustrated that a good dispersion and embedment of the rGO/ZnO NPs within the PUF matrix occurred. The adsorption capacity for neat PUF showed that around 20% of the Methylene blue (MB) dye was only adsorbed on its surface. However, it was found that an exceptional adsorption capacity for MB degradation was observed when the rGO/ZnO NPs inserted into the PUF, which initially deteriorated to ~ 70 % of its initial concentration. Notably, the MB dye was completely degraded within 3 h.
Collapse
Affiliation(s)
- Mohamed Morsy
- Building Physics and Environment Institute, Housing & Building National Research Center (HBRC), Dokki, Giza 12311, Egypt
- Nanotechnology Research Centre (NTRC), The British University in Egypt (BUE), Suez Desert Road, El-Sherouk City, Cairo 11837, Egypt
- Correspondence: author: (M.M.); (H.K.)
| | - Ahmed I. Abdel-Salam
- Nanotechnology Research Centre (NTRC), The British University in Egypt (BUE), Suez Desert Road, El-Sherouk City, Cairo 11837, Egypt
| | - Islam Gomaa
- Nanotechnology Research Centre (NTRC), The British University in Egypt (BUE), Suez Desert Road, El-Sherouk City, Cairo 11837, Egypt
| | - Hesham Moustafa
- Department of Polymer Metrology & Technology, National Institute of Standards (NIS), Tersa Street, El Ha-ram, P.O. Box 136, Giza 12211, Egypt
- Bioanalysis Laboratory, National Institute of Standards (NIS), Tersa Street, El Haram, P.O. Box 136, Giza 12211, Egypt
| | - Haitham Kalil
- Chemistry Department, Cleveland State University, Cleveland, OH 44115, USA
- Chemistry Department, Faculty of Science, Suez Canal University, Ismailia 41522, Egypt
- Correspondence: author: (M.M.); (H.K.)
| | - Ahmed Helal
- Nanostructured Materials and Nanotechnology Division, Central Metallurgical Research and Development Institute, Helwan, Cairo 11722, Egypt
| |
Collapse
|
4
|
Ngo HM, Pawar AU, Tang J, Zhuo Z, Lee DK, Ok KM, Kang YS. Synthesis of Uniform Size Rutile TiO2 Microrods by Simple Molten-Salt Method and Its Photoluminescence Activity. NANOMATERIALS 2022; 12:nano12152626. [PMID: 35957057 PMCID: PMC9370513 DOI: 10.3390/nano12152626] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 07/19/2022] [Accepted: 07/26/2022] [Indexed: 02/01/2023]
Abstract
Uniform-size rutile TiO2 microrods were synthesized by simple molten-salt method with sodium chloride as reacting medium and different kinds of sodium phosphate salts as growth control additives to control the one-dimensional (1-D) crystal growth of particles. The effect of rutile and anatase ratios as a precursor was monitored for rod growth formation. Apart from uniform rod growth study, optical properties of rutile microrods were observed by UV−visible and photoluminescence (PL) spectroscopy. TiO2 materials with anatase and rutile phase show PL emission due to self-trapped exciton. It has been observed that synthesized rutile TiO2 rods show various PL emission peaks in the range of 400 to 900 nm for 355 nm excitation wavelengths. All PL emission appeared due to the oxygen vacancy present inside rutile TiO2 rods. The observed PL near the IR range (785 and 825 nm) was due to the formation of a self-trapped hole near to the surface of (110) which is the preferred orientation plane of synthesized rutile TiO2 microrods.
Collapse
Affiliation(s)
- Hieu Minh Ngo
- Department of Chemistry, Sogang University, Seoul 04107, Korea; (H.M.N.); (K.M.O.)
| | - Amol Uttam Pawar
- Environmental and Climate Technology, Korea Institute of Energy Technology, Naju-si 58219, Korea; (A.U.P.); (D.K.L.)
| | - Jun Tang
- Zhejiang Coloray Technology Development Co., Ltd., No. 151, Huishan Road, Deqing County, Huzhou 313200, China; (J.T.); (Z.Z.)
| | - Zhongbiao Zhuo
- Zhejiang Coloray Technology Development Co., Ltd., No. 151, Huishan Road, Deqing County, Huzhou 313200, China; (J.T.); (Z.Z.)
| | - Don Keun Lee
- Environmental and Climate Technology, Korea Institute of Energy Technology, Naju-si 58219, Korea; (A.U.P.); (D.K.L.)
| | - Kang Min Ok
- Department of Chemistry, Sogang University, Seoul 04107, Korea; (H.M.N.); (K.M.O.)
| | - Young Soo Kang
- Environmental and Climate Technology, Korea Institute of Energy Technology, Naju-si 58219, Korea; (A.U.P.); (D.K.L.)
- Correspondence:
| |
Collapse
|
5
|
Lee J, Seong S, Jin S, Kim J, Jeong Y, Noh J. Strainer-Separable TiO 2 on Halloysite Nanocomposite-Embedded Alginate Capsules with Enhanced Photocatalytic Activity for Degradation of Organic Dyes. NANOMATERIALS 2022; 12:nano12142361. [PMID: 35889586 PMCID: PMC9320041 DOI: 10.3390/nano12142361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 07/07/2022] [Accepted: 07/08/2022] [Indexed: 02/01/2023]
Abstract
Photocatalysis driven by natural sunlight is an attractive approach to removing pollutants from wastewater. Although TiO2–based photocatalysts using various support nano-materials with high catalytic activity and reusability have been developed for purifying wastewater, the centrifugal separation methods used for the nanocatalysts limit their use for treating large amounts of water. Here, we prepared a TiO2 nano-catalyst supported on a halloysite nanotube (HNT)-encapsulated alginate capsule (TiO2@HNT/Alcap) to recapture the catalysts rapidly without centrifugation. The structure of TiO2@HNT/Alcap was characterized by X-ray diffraction, SEM, and TGA. In our system, the combination of HNTs and alginate capsules (Alcaps) improved the efficiency of adsorption of organic pollutants to TiO2, and their milli = meter scale structure allowed ultra-fast filtering using a strainer. The TiO2@HNT/Alcaps showed ~1.7 times higher adsorption of rhodamine B compared to empty alginate capsules and also showed ~10 and ~6 times higher degradation rate compared to the HNT/Alcaps and TiO2/Alcaps, respectively.
Collapse
Affiliation(s)
- Jewon Lee
- Department of Convergence of Nanoscience, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea;
| | - Sicheon Seong
- Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea; (S.S.); (S.J.)
| | - Soyeong Jin
- Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea; (S.S.); (S.J.)
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea
| | - Jaeyong Kim
- Department of Physics, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea;
| | - Youngdo Jeong
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea
- Department of HY-KIST Bio-Convergence, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
- Correspondence: (Y.J.); (J.N.)
| | - Jaegeun Noh
- Department of Convergence of Nanoscience, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea;
- Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea; (S.S.); (S.J.)
- Institute of Nano Science and Technology, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
- Correspondence: (Y.J.); (J.N.)
| |
Collapse
|