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Cerón-Urbano L, Aguilar CJ, Diosa JE, Mosquera-Vargas E. Nanoparticles of the Perovskite-Structure CaTiO 3 System: The Synthesis, Characterization, and Evaluation of Its Photocatalytic Capacity to Degrade Emerging Pollutants. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2967. [PMID: 37999321 PMCID: PMC10674298 DOI: 10.3390/nano13222967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 11/01/2023] [Accepted: 11/08/2023] [Indexed: 11/25/2023]
Abstract
In this research work, the photocatalytic capacity shown by the nanoparticles of the CaTiO3 system was evaluated to degrade two pollutants of emerging concern, namely methyl orange (MO)-considered an organic contaminating substance of the textile industry that is non-biodegradable when dissolved in water-and levofloxacin (LVF), an antibiotic widely used in the treatment of infectious diseases that is released mostly to the environment in its original chemical form. The synthesis process used to obtain these powders was the polymeric precursor method (Pechini), at a temperature of 700 °C for 6 h. The characterization of the obtained oxide nanoparticles of interest revealed the presence of a majority perovskite-type phase with an orthorhombic Pbnm structure and a minority rutile-type TiO2 phase, with a P42/mnm structure and a primary particle size <100nm. The adsorption-desorption isotherms of the synthesized solids had H3-type hysteresis loops, characteristic of mesoporous solids, with a BET surface area of 10.01m2/g. The Raman and FTIR spectroscopy results made it possible to identify the characteristic vibrations of the synthesized system and the characteristic deformations of the perovskite structure, reiterating the results obtained from the XRD analysis. Furthermore, a bandgap energy of ~3.4eV and characteristic emissions in the violet (437 nm/2.8 eV) and orange (611 nm/2.03 eV) were determined for excitation lengths of 250 nm and 325 nm, respectively, showing that these systems have a strong emission in the visible light region and allowing their use in photocatalytic activity to be potentialized. The powders obtained were studied for their photocatalytic capacity to degrade methyl orange (MO) and levofloxacin (LVF), dissolved in water. To quantify the coloring concentration, UV-visible spectroscopy was used considering the variation in the intensity of the characteristic of the greatest absorption, which correlated with the change in the concentration of the contaminant in the solution. The results showed that after irradiation with ultraviolet light, the degradation of the contaminants MO and LVF was 79.4% and 98.1% with concentrations of 5 g/L and 10 g/L, respectively.
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Affiliation(s)
- Lizet Cerón-Urbano
- Grupo de Transiciones de Fase y Materiales Funcionales, Departamento de Física, Facultad de Ciencias Naturales y Exactas, Universidad del Valle, Santiago de Cali 760042, Colombia; (L.C.-U.); (C.J.A.); (J.E.D.)
- Centro de Excelencia en Nuevos Materiales (CENM), Universidad del Valle, Santiago de Cali 760042, Colombia
| | - Carol J. Aguilar
- Grupo de Transiciones de Fase y Materiales Funcionales, Departamento de Física, Facultad de Ciencias Naturales y Exactas, Universidad del Valle, Santiago de Cali 760042, Colombia; (L.C.-U.); (C.J.A.); (J.E.D.)
- Centro de Excelencia en Nuevos Materiales (CENM), Universidad del Valle, Santiago de Cali 760042, Colombia
| | - Jesús E. Diosa
- Grupo de Transiciones de Fase y Materiales Funcionales, Departamento de Física, Facultad de Ciencias Naturales y Exactas, Universidad del Valle, Santiago de Cali 760042, Colombia; (L.C.-U.); (C.J.A.); (J.E.D.)
- Centro de Excelencia en Nuevos Materiales (CENM), Universidad del Valle, Santiago de Cali 760042, Colombia
| | - Edgar Mosquera-Vargas
- Grupo de Transiciones de Fase y Materiales Funcionales, Departamento de Física, Facultad de Ciencias Naturales y Exactas, Universidad del Valle, Santiago de Cali 760042, Colombia; (L.C.-U.); (C.J.A.); (J.E.D.)
- Centro de Excelencia en Nuevos Materiales (CENM), Universidad del Valle, Santiago de Cali 760042, Colombia
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Khan MJ, Ahirwar A, Sirotiya V, Rai A, Varjani S, Vinayak V. Nanoengineering TiO 2 for evaluating performance in dye sensitized solar cells with natural dyes. RSC Adv 2023; 13:22630-22638. [PMID: 37501775 PMCID: PMC10369046 DOI: 10.1039/d3ra02927a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 07/17/2023] [Indexed: 07/29/2023] Open
Abstract
The current study employs nanoengineering diatom and TiO2 NPs to form diatom-Si-TiO2 nanoengineered structures to fabricate a dye sensitized solar cell (DSSC) (DsTnas-DSSC). This was characterized and spin coated on a Fluorine-doped Tin Oxide (FTO) anode plate. The counter cathode was prepared by spin coating graphene oxide on a FTO glass plate and using Lugol's iodine as an electrolyte. The power density of DsTnas-DSSC was estimated with different natural dyes in comparison to conventional photosensitive ruthenium dye. It was found that the natural dyes extracted from plants and microalgae show significant power efficiencies in DSSC. The percentage efficiency of maximum power densities (PDmax) of DsTnas-DSSC obtained with photosensitive dyes were 9.4% with synthetic ruthenium dye (control) and 7.19% > 4.08% > 0.72% > 0.58% > 0.061% from natural dyes found in Haematococcus pluvialis (astaxanthin) > Syzygium cumini (anthocyanin) > Rosa indica (anthocyanin) > Hibiscus rosa-sinensis (anthocyanin) > Beta vulgaris (betalains), respectively. Among all the natural dyes used, the PDmax for the control ruthenium dye was 6.164 mW m-2 followed by the highest in astaxanthin natural dye from Haematococcus pluvialis (5.872 mW m-2). Overall, the use of natural dye DsTnas-DSSC makes the fuel cell low cost and an alternative to conventional expensive, metal and synthetic dyes.
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Affiliation(s)
- Mohd Jahir Khan
- Diatom Nanoengineering and Metabolism Laboratory (DNM), School of Applied Science, Dr. Harisingh Gour Central University Sagar MP 470003 India
| | - Ankesh Ahirwar
- Diatom Nanoengineering and Metabolism Laboratory (DNM), School of Applied Science, Dr. Harisingh Gour Central University Sagar MP 470003 India
| | - Vandana Sirotiya
- Diatom Nanoengineering and Metabolism Laboratory (DNM), School of Applied Science, Dr. Harisingh Gour Central University Sagar MP 470003 India
| | - Anshuman Rai
- School of Engineering, Department of Biotechnology, Maharishi Markendeshwar University Ambala Haryana 133203 India
- State Forensic Science Laboratory Haryana Madhuban 132037 India
| | - Sunita Varjani
- School of Energy and Environment, City University of Hong Kong Tat Chee Avenue Kowloon 999077 Hong Kong
- Sustainability Cluster, School of Engineering, University of Petroleum and Energy Studies Dehradun-248 007 Uttarakhand India
| | - Vandana Vinayak
- Diatom Nanoengineering and Metabolism Laboratory (DNM), School of Applied Science, Dr. Harisingh Gour Central University Sagar MP 470003 India
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Gamarra F, Medina J, Lanchipa W, Tamayo R, Sacari E. Structural, Optical, and Arsenic Removal Properties of Sol-Gel Synthesized Fe-Doped TiO 2 Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3402. [PMID: 36234527 PMCID: PMC9565318 DOI: 10.3390/nano12193402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/17/2022] [Accepted: 09/20/2022] [Indexed: 06/16/2023]
Abstract
Pure and Fe-doped TiO2 nanoparticles were synthesized by the sol-gel method. The samples were characterized by X-ray diffraction, Raman spectroscopy, BET, UV-vis diffuse reflectance spectroscopy, and scanning electron microscopy. The results show a dependence between the crystallite size and the amount of dopant, which decreases from 13.02 to 12.81 nm. The same behavior was observed in the optical properties, where the band gap decreased from 3.2 to 2.86 eV. The arsenic (V) adsorption was tested in aqueous solution containing 5 mg/L of arsenic and 0.5 g/L of adsorbent at pH 7 and in dark conditions. The results indicate that the TiO2-B sample shows a higher arsenic removal, reaching 88% arsenic removal from the water at pH 7. Thus, it is also shown that the best performance occurs at pH 5, where it reaches an arsenic removal of 94%. Ion competition studies show that arsenic removal capacity is slightly affected by chloride, carbonate, nitrate, and sulfate ions. According to the results, the synthesized samples are a promising material for treating arsenic-contaminated water.
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Affiliation(s)
- Francisco Gamarra
- Laboratorio de Nanotecnología, Facultad de Ingeniería, Universidad Nacional Jorge Basadre Grohmann, Av. Miraflores s/n, Tacna 23003, Perú
| | - Jesús Medina
- Laboratorio de Nanotecnología, Facultad de Ingeniería, Universidad Nacional Jorge Basadre Grohmann, Av. Miraflores s/n, Tacna 23003, Perú
| | - Wilson Lanchipa
- Laboratorio de Nanotecnología, Facultad de Ingeniería, Universidad Nacional Jorge Basadre Grohmann, Av. Miraflores s/n, Tacna 23003, Perú
| | - Rocío Tamayo
- Departamento de Ingeniería de Materiales, Facultad de Ingeniería de Procesos, Universidad Nacional de San Agustín, Arequipa 04001, Perú
- Laboratorio de Microscopia Electrónica de Transmisión, Centro de Microscopia Electrónica, Facultad de Ingeniería de Procesos, Universidad Nacional de San Agustín, Arequipa 04001, Perú
| | - Elisban Sacari
- Laboratorio de Nanotecnología, Facultad de Ingeniería, Universidad Nacional Jorge Basadre Grohmann, Av. Miraflores s/n, Tacna 23003, Perú
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Khan MJ, Pugazhendhi A, Schoefs B, Marchand J, Rai A, Vinayak V. Perovskite-based solar cells fabricated from TiO 2 nanoparticles hybridized with biomaterials from mollusc and diatoms. CHEMOSPHERE 2022; 291:132692. [PMID: 34718006 DOI: 10.1016/j.chemosphere.2021.132692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 09/17/2021] [Accepted: 10/23/2021] [Indexed: 06/13/2023]
Abstract
Perovskite solar cells (PVSCs) convert solar energy into electrical energy. Current study employs fabrication of PVSCs using calcium titanate (CaTiO3) prepared by co-precipitation of TiO2 nanoparticle (NP) and CaCO3 NP with later synthesized from mollusc shell. Furthermore, frustules of diatom, Nitzschia palea were used to prepare silica doped CaTiO3 (Si-CaTiO3) nanocomposite. CaTiO3 NP and Si-CaTiO3 nanocomposites film were made on fluorine doped tin oxide (FTO) glass plate using spin coater separately for two different kinds of PVSCs tested at different intensities of light. The perovskite materials were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) and energy dispersive X-ray (EDX) spectroscopy. Thickness of the film was measured by profilometer. The maximum power density (PDmax) of CaTiO3 made PVSCs was 0.235 mW/m2 under white LED light and 0.041 mW/m2 in broad spectrum light. Whereas, PDmax of PVSCs with Si-CaTiO3 was higher about 0.0083 mW/m2 in broad spectrum light and was 0.0039 mW/m2 in white LED light. This is due to the fact that CaTiO3 allowed blue and red light in broad spectrum to pass through it without being absorbed compared to white LED light which gets reflected. On the offset, in PVSC made of Si-CaTiO3 since diatoms frustules are made up of nanoporous architecture it increases the overall porosity of PVSC making them potentially more efficient in broad spectrum of light compared to white LED light.
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Affiliation(s)
- Mohd Jahir Khan
- Diatom Nanoengineering and Metabolism Laboratory (DNM), School of Applied Sciences, Dr Harisingh Gour Central University, Sagar, Madhya Pradesh, 470003, India
| | - Arivalagan Pugazhendhi
- School of Renewable Energy, Maejo University, Chiang Mai, 50290, Thailand; College of Medical and Health Science, Asia University, Taichung, Taiwan
| | - Benoit Schoefs
- Metabolism, Bioengineering of Microalgal Metabolism and Applications (MIMMA), Mer Molecules Santé, Le Mans University, IUML - FR 3473 CNRS, Le Mans, France
| | - Justine Marchand
- Metabolism, Bioengineering of Microalgal Metabolism and Applications (MIMMA), Mer Molecules Santé, Le Mans University, IUML - FR 3473 CNRS, Le Mans, France
| | - Anshuman Rai
- MMU, Deemed University, School of Engineering, Department of Biotechnology, Ambala, Haryana, 133203, India
| | - Vandana Vinayak
- Diatom Nanoengineering and Metabolism Laboratory (DNM), School of Applied Sciences, Dr Harisingh Gour Central University, Sagar, Madhya Pradesh, 470003, India.
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Agro-Waste Derived Biomass Impregnated with TiO2 as a Potential Adsorbent for Removal of As(III) from Water. Catalysts 2020. [DOI: 10.3390/catal10101125] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A novel type of adsorbent, TiO2 impregnated pomegranate peels (PP@TiO2) was successfully synthesized and its efficacy was investigated based on the removal of As(III) from water. The adsorbent was characterized using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectrometer (EDS), X-ray Diffraction (XRD) analysis, and Fourier Transform Infrared (FTIR) Spectroscopy, to evaluate its morphology, elemental analysis, crystallinity, and functional groups, respectively. Batch experiments were conducted on PP@TiO2 for As(III) adsorption to assess the adsorption isotherm, effect of pH, and adsorption kinetics. Characterization data suggested that TiO2 was successfully impregnated on the biomass substrate. The equilibrium data better fitted to the Langmuir isotherm model having a maximum adsorption capacity of 76.92 mg/g and better distribution coefficients (KD) in the order of ~103 mL/g. The highest percentage of adsorption was found at neutral pH. The adsorption kinetics followed the pseudo-2nd-order model. X-ray Photoelectron Spectroscopy (XPS) of the adsorption product exhibited that arsenic was present as As(III) and partially oxidized to As(V). PP@TiO2 can work effectively in the presence of coexisting anions and could be regenerated and reused. Overall, these findings suggested that the as-prepared PP@TiO2 could provide a better and efficient alternative for the synergistic removal of As(III) from water.
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Yang CH, Chang JS, Lee DJ. Covalent organic framework EB-COF:Br as adsorbent for phosphorus (V) or arsenic (V) removal from nearly neutral waters. CHEMOSPHERE 2020; 253:126736. [PMID: 32302910 DOI: 10.1016/j.chemosphere.2020.126736] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/26/2020] [Accepted: 04/04/2020] [Indexed: 05/27/2023]
Abstract
The covalent organic framework (COF) is made light elements linked by covalent networks. This study synthesize and characterized, and for the first time applied the produced EB-COF:Br as adsorbent for phosphate and arsenate removal from nearly neutral waters. The synthesized COF was first proven structurally stable in solutions of 75% H3PO4, 6 M HCl, or 6 M NaOH. Then the phosphate adsorption onto the EB-COF:Br was shown to be an endothermic process with maximum adsorption capacity at 25, 35 and 45 °C as 25.3, 34.7 and 35.3 mg/g COF, respectively; and the corresponding arsenate adsorption process being an exothermic process with maximnum adsorption capacity as 53.1, 27.5 and 5.1 mg/g, respectively. The synthesized COF could also effectively adsorb phosphate and arsenate ions from river water (pH 7.45) but at reduced adsorption capacities. The electrostatic interactions between the negative charge on phosphate or arsenate ions and the positively charged (N+-) of COF, and the hydrogen bondings between H atom on phosphate or arsenate ions and the (-CO) group of COF were the dominating mechanisms for the present adsorption process. The strong electrostatic interactions for arsenate contributed to its higer adsorption capacity than noted for phosphate at 25 °C. However, the disturbed hydrogen bonding induced by mismatched sizes of arsenate ion and the adsorption sites surrounded by the (N+-) and the (-CO) groups reduced the stability of arsenate to against temperature and external anion challenges. The use of the EB-COF; Br as industrial adsorbent was also discussed.
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Affiliation(s)
- Cheng-Hao Yang
- Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan
| | - Jo-Shu Chang
- Department of Chemical Engineering, College of Engineering, Tunghai University, Taichung, 40704, Taiwan
| | - Duu-Jong Lee
- Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan; Department of Chemical Engineering, College of Engineering, Tunghai University, Taichung, 40704, Taiwan; National Taiwan University of Science and Technology, Taipei, 10607, Taiwan.
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