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Hollanda LR, de Souza JAB, Dotto GL, Foletto EL, Chiavone-Filho O. Iron-bearing mining reject as an alternative and effective catalyst for photo-Fenton oxidation of phenol in water. Environ Sci Pollut Res Int 2024; 31:21291-21301. [PMID: 38383932 DOI: 10.1007/s11356-024-32513-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 02/13/2024] [Indexed: 02/23/2024]
Abstract
In this work, iron-bearing mining reject was employed as an alternative and potential low-cost catalyst to degrade phenol in water by photo-Fenton strategy. Various techniques, including SEM-EDS, BET, FTIR, and XRD, were applied to evaluate the material's properties. Process parameters such as hydrogen peroxide concentration, catalyst dosage, and pH were studied to determine the optimum reaction conditions ([catalyst] = 0.75 g L-1, [H2O2] = 7.5 mM, and pH = 3). Phenol degradation and mineralization efficiencies at 180 and 300 min were 96.5 and 78%, respectively. These satisfactory results can be associated with the iron amount present in the waste sample. Furthermore, the material showed high catalytic activity and negligible iron leaching even after the fourth reuse cycle. The degradation behavior of phenol in water was well represented by a kinetic model based on the Fermi function. The iron-bearing mining reject can be considered a potential photo-Fenton catalyst for phenol degradation in wastewater.
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Affiliation(s)
- Luana Rabelo Hollanda
- Department of Chemical Engineering, Federal University of Rio Grande Do Norte, Natal, 59078-970, Brazil
| | | | - Guilherme Luiz Dotto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
| | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Osvaldo Chiavone-Filho
- Department of Chemical Engineering, Federal University of Rio Grande Do Norte, Natal, 59078-970, Brazil
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2
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Hollanda LR, de Souza JAB, Foletto EL, Dotto GL, Chiavone-Filho O. Applying bottom ash as an alternative Fenton catalyst for effective removal of phenol from aqueous environment. Environ Sci Pollut Res Int 2023; 30:120763-120774. [PMID: 37943438 DOI: 10.1007/s11356-023-30890-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Accepted: 11/01/2023] [Indexed: 11/10/2023]
Abstract
In this study, coal bottom ash from a thermoelectric plant was tested as an alternative Fenton catalyst for phenol degradation in water. The effect of operating parameters such as initial pH, catalyst dosage and H2O2 concentration were evaluated. The characterization results indicated that the material has a mesoporous structure, with active species (Fe) well distributed on its surface. Under the optimal reaction conditions (6 mM H2O2, 1 g L-1 of catalyst and pH = 3), 98.7% phenol degradation efficiency was achieved in 60 min, as well as 71.6% TOC removal after 150 min. Hydroxyl radical was identified as the main oxidizing agent involved on the cleavage of the phenol molecule. After four consecutive reuse cycles, phenol degradation efficiency was around 80%, indicating good reusability and stability of the catalyst. Therefore, the obtained results demonstrated that the bottom ash presents remarkable activity for application in the Fenton reaction towards phenol degradation.
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Affiliation(s)
- Luana Rabelo Hollanda
- Department of Chemical Engineering, Federal University of Rio Grande Do Norte, Natal, 59078-970, Brazil
| | | | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
| | - Osvaldo Chiavone-Filho
- Department of Chemical Engineering, Federal University of Rio Grande Do Norte, Natal, 59078-970, Brazil
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Kumar SA, Rosaline DR, Foletto EL, Dotto GL, Inbanathan SSR, Muralidharan G. Application of green-synthesized cadmium oxide nanofibers and cadmium oxide/graphene nanosheet nanocomposites as alternative and efficient photocatalysts for methylene blue removal from aqueous matrix. Environ Sci Pollut Res Int 2023; 30:117390-117403. [PMID: 37870670 DOI: 10.1007/s11356-023-30425-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 10/08/2023] [Indexed: 10/24/2023]
Abstract
For the first time, cadmium oxide (CdO) nanofibers (NFs) and graphene nanosheet (GNS)-doped CdO nanocomposites (NCs) have been synthesized by a simple green route using green tea (Camellia sinensis) extract, for subsequent application as photocatalysts for methylene blue (MB) removal from an aqueous matrix. In addition, the materials were tested as working electrodes for supercapacitors. The prepared samples were analyzed by FESEM, UV-Vis spectroscopy, FTIR, and X-ray diffraction (XRD). FESEM revealed that the obtained NPs and NCs show fiber-shaped nanostructure. FTIR confirmed the presence of biomolecules on CdO and carbon compounds on CdO/GNS, while XRD exhibited the cubic crystalline structure of obtained NPs and NCs. The Rietveld refinement using XRD data was performed to ascertain the crystallographic characteristics of the produced samples and look into lattice imperfections. UV-Vis spectroscopy evaluated the optical bandgap energies of CdO and CdO/GNS NCs. The CdO/GNS NCs demonstrated a fast cleavage of the dye molecule under UV irradiation, resulting in 97% removal in 120 min. In addition, CdO/GNS NCs showed remarkable chemical stability as an electrode material, with a high specific capacitance of 231 F g-1 at a scan rate of 25 mV s-1. These observed NCs characteristics are higher when compared to pristine CdO NPs. Finally, we found that the investigated NCs showed enhanced multifunctional properties, such as photocatalytic and supercapacitor characteristics, which can be useful in practical applications.
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Affiliation(s)
- Sundararajan Ashok Kumar
- Post Graduate and Research Department of Physics, The American College, Madurai, Tamil Na du, 625002, India
| | - Daniel Rani Rosaline
- Post Graduate and Research Department of Chemistry, Lady Doak College, Madurai, Tamil Na du, 625002, India
| | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
| | | | - Gopalan Muralidharan
- Department of Physics, The Gandhigram Rural Institute (Deemed to be University), Gandhigram, Dindigul, Tamil Na du, 624302, India
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Grassi P, Streit AFM, Hollanda LR, Dotto GL, Foletto EL. Augmented degradation of dyed organic pollutant using Fe 2O 3 supported on char formed from poultry slaughterhouse waste. Environ Sci Pollut Res Int 2023; 30:104056-104066. [PMID: 37698796 DOI: 10.1007/s11356-023-29783-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 09/04/2023] [Indexed: 09/13/2023]
Abstract
In this work, a novel support for an iron-based catalyst was prepared and employed for Ponceau 4R degradation by photo-Fenton reaction. To this, poultry waste was used for producing char, which was subsequently used to prepare the Fe2O3/Char composite. Process parameters, including catalyst dosage, pH, and hydrogen peroxide concentration, were investigated. The characterization analysis indicated that the textural properties of the composite were improved after impregnation with Fe2O3. The composite exhibited excellent catalytic activity, achieving a decolorization efficiency of 97% at 45 min and 81.06% organic carbon removal at 300 min. In addition, the material showed acceptable performance after four consecutive cycles. Furthermore, a scavenger test was performed to investigate the major reactive species involved in the Ponceau 4R oxidation, and a plausible mechanism for the respective reaction was projected. Therefore, the results of this research demonstrate that this material can be used as a potential catalyst for the abatement of dyed molecules from wastewater.
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Affiliation(s)
- Patrícia Grassi
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | | | - Luana Rabelo Hollanda
- Chemical Engineering Department, Federal University of Rio Grande Do Norte, Natal, 59078-970, Brazil
| | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
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Santos SBF, Hollanda LR, Vieira Y, Dotto GL, Foletto EL, Chiavone-Filho O. Enhanced UV-light driven photocatalytic performance of magnetic CoFe 2O 4/TiO 2 nanohybrid for environmental applications. Environ Sci Pollut Res Int 2023:10.1007/s11356-023-27762-z. [PMID: 37213008 DOI: 10.1007/s11356-023-27762-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 05/15/2023] [Indexed: 05/23/2023]
Abstract
In this work, CoFe2O4/TiO2 nanostructure was prepared through a facile and effective solvothermal route for efficient use in the degradation of the Erionyl Red A-3G model pollutant under ultraviolet irradiation. Characterization analysis indicated the successful heterojunction among the precursors. The composite presented band gap value of 2.75 eV, being smaller than that of the pristine TiO2, as well as mesoporous structure. The catalytic activity of nanostructure was investigated by employing a 22 factorial experimental design with 3 central points. The optimized reaction conditions were set as pH = 2 and catalyst dosage = 1.0 g L-1 for an initial pollutant concentration of 20 mg L-1. The prepared nanohybrid presented remarkable catalytic activity, reaching color removal efficiency of 95.39% after 15 min, as well as total organic carbon (TOC) removal of 69.4% after 120 min. The kinetic studies of TOC removal followed the pseudo-first order model, with a rate constant of 0.10 min-1. Moreover, the nanostructure presented magnetic behavior, being easily separated from the aqueous medium through the use of a simple external magnetic field.
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Affiliation(s)
| | - Luana Rabelo Hollanda
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal, 59078-970, Brazil
| | - Yasmin Vieira
- Department of Chemistry, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Department of Chemistry, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
| | - Edson Luiz Foletto
- Department of Chemistry, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Osvaldo Chiavone-Filho
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal, 59078-970, Brazil
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Jarvin M, Rosaline DR, Gopalakrishnan T, Kamalam MBR, Foletto EL, Dotto GL, Inbanathan SSR. Remarkable photocatalytic performances towards pollutant degradation under sunlight and enhanced electrochemical properties of TiO 2/polymer nanohybrids. Environ Sci Pollut Res Int 2023; 30:62832-62846. [PMID: 36947375 DOI: 10.1007/s11356-023-26486-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 03/11/2023] [Indexed: 05/10/2023]
Abstract
In this work, TiO2-based nanocomposites containing polyaniline (PANI), poly(1-naphthylamine) (PNA), and polyindole (PIN) were synthesized by effective and simple routes and posteriorly employed as photocatalysts and supercapacitors. Characterization techniques such as XRD, FTIR, FESEM, UV, and PL were employed to investigate the structural, morphological, and optical properties of materials. XRD analysis confirmed the successful formation of TiO2 and TiO2/polymer nanocomposites. PANI, PNA, and PIN polymers were well distributed on the surface of TiO2 nanoparticles and were investigated/explored from the FESEM analysis. The visible light absorption and the recombination rate of photogenerated charge carriers were confirmed by the UV-Vis and PL analysis. The photocatalytic properties of the nanocomposites were investigated towards malachite green (MG) dye degradation under sunlight. The dye degradation efficiency followed the order TiO2/PNA > TiO2/PANI > TiO2 > TiO2/PIN. The higher efficiency of TiO2/PNA can be associated with its smaller bandgap energy compared to the other materials. Electrochemical properties of materials were also examined by cyclic voltammetry and galvanostatic charge-discharge measurements using a three-electrode experiment setup in an aqueous electrolyte. TiO2/PNA nanocomposite showed higher supercapacitor behavior compared to the other materials due to higher electrical conductivity of PNA and redox potential of TiO2 (pseudocapacitance).
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Affiliation(s)
- Mariadhas Jarvin
- Post Graduate and Research Department of Physics, The American College, Madurai, 625002, Tamil Nadu, India
| | - Daniel Rani Rosaline
- Post Graduate and Research Department of Chemistry, Lady Doak College, Madurai, 625002, Tamil Nadu, India
| | | | | | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
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Umar A, Kumar SA, Rosaline DR, Algadi H, Ibrahim AA, Ahmed F, Foletto EL, Inbanathan SSR. Poly(1-Napthylamine) Nanoparticles as Potential Scaffold for Supercapacitor and Photocatalytic Applications. Micromachines (Basel) 2022; 13:1528. [PMID: 36144151 PMCID: PMC9502796 DOI: 10.3390/mi13091528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 09/05/2022] [Accepted: 09/08/2022] [Indexed: 06/16/2023]
Abstract
Herein, we explore the supercapacitor and photocatalytic applications of poly(1-naphthylamine) (PNA) nanoparticles. The PNA nanoparticles were synthesized by using polymerization of 1-naphthylamine and characterized with several techniques in order to understand the morphological, structural, optical and compositional properties. The structural and morphological properties confirmed the formation of crystalline nanoparticles of PNA. The Fourier-transform infrared (FTIR) spectrum revealed the successful polymerization of 1-naphthylamine monomer to PNA. The absorption peaks that appeared at 236 and 309 nm in the UV−Vis spectrum for PNA nanoparticles represented the π−π* transition. The supercapacitor properties of the prepared PNA nanoparticles were evaluated with cyclic voltammetry (CV) and galvanostatic charge−discharge (GCD) methods at different scan rates and current densities, respectively. The effective series resistance was calculated using electrochemical impedance spectroscopy (EIS), resulting in a minimum resistance value of 1.5 Ω. The highest specific capacitance value of PNA was found to be 255 Fg−1. This electrode also exhibited excellent stability with >93% capacitance retention for 1000 cycles, as measured at 1A g−1. Further, the prepared PNA nanoparticles were used as an effective photocatalyst for the photocatalytic degradation of methylene blue (MB) dye, which exhibited ~61% degradation under UV light irradiation. The observed results revealed that PNA nanoparticles are not only a potential electrode material for supercapacitor applications but also an efficient photocatalyst for the photocatalytic degradation of hazardous and toxic organic dyes.
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Affiliation(s)
- Ahmad Umar
- Department of Chemistry, College of Science and Arts, and Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran 11001, Saudi Arabia
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Sundararajan Ashok Kumar
- Post Graduate and Research, Department of Physics, The American College, Madurai 625002, Tamil Nadu, India
| | - Daniel Rani Rosaline
- Post Graduate and Research, Department of Chemistry, Lady Doak College, Madurai 625002, Tamil Nadu, India
| | - Hassan Algadi
- Department of Electrical Engineering, College of Engineering, Najran University, Najran 11001, Saudi Arabia
| | - Ahmed A. Ibrahim
- Department of Chemistry, College of Science and Arts, and Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran 11001, Saudi Arabia
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Faheem Ahmed
- Department of Physics, College of Science, King Faisal University, Al-Ahsa 31982, Saudi Arabia
| | - Edson Luiz Foletto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil
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Jarvin M, Kumar SA, Rosaline DR, Foletto EL, Dotto GL, Inbanathan SSR. Remarkable sunlight-driven photocatalytic performance of Ag-doped ZnO nanoparticles prepared by green synthesis for degradation of emerging pollutants in water. Environ Sci Pollut Res Int 2022; 29:57330-57344. [PMID: 35349064 DOI: 10.1007/s11356-022-19796-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 03/14/2022] [Indexed: 06/14/2023]
Abstract
In this work, Ag-doped ZnO nanoparticles (NPs) were synthesized by a simple green method using a toxic agent-free route for photocatalytic purposes, toward methylene blue (MB) removal in water under sunlight irradiation. The effects of operating parameters, such as catalyst dosage, dye concentration, and pH, on the MB removal efficiency, were investigated. The presence of Ag on the ZnO structure resulted in superior catalytic activity compared to the pure ZnO sample. High removal efficiency for MB, corresponding to 95%, was obtained in 30 min of reaction time only, using Ag-doped ZnO NPs. This result can be related to its smaller bandgap energy (1.92 eV) when compared to the ZnO sample (2.85 eV). The material presented a satisfactory level of reusability after three consecutive cycles. In addition, a reaction mechanism for MB photodegradation onto Ag-doped ZnO NPs under sunlight irradiation was suggested. Overall, the catalyst prepared via the green route in this work exhibited excellent photocatalytic activity under sunlight for MB degradation in an aqueous solution.
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Affiliation(s)
- Mariyadhas Jarvin
- Post Graduate and Research Department of Physics, The American College, Madurai, 625002, Tamil Nadu, India
| | - Sundararajan Ashok Kumar
- Post Graduate and Research Department of Physics, The American College, Madurai, 625002, Tamil Nadu, India
| | - Daniel Rani Rosaline
- Post Graduate and Research Department of Chemistry, Lady Doak College, Madurai, 625002, Tamil Nadu, India
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
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Franco DSP, da Boit Martinello K, Georgin J, Netto MS, Foletto EL, Piccilli DGA, Silva LFO, Dos Reis GS, Dotto GL. Application of biowaste generated by the production chain of pitaya fruit (Hylocereus undatus) as an efficient adsorbent for removal of naproxen in water. Environ Sci Pollut Res Int 2022; 29:39754-39767. [PMID: 35112257 DOI: 10.1007/s11356-022-18981-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 01/27/2022] [Indexed: 06/14/2023]
Abstract
Pharmaceutical compounds are a serious problem in the environment. They cause damage to the aquatic, animal, and human organisms and soon became considered emerging pollutants where their removal is extremely urgent. Among the techniques used, adsorption has been used with success, where several adsorbent materials, including those from residual biomass, have been used to remove these pollutants. In this study, the skins of the pitaya fruit (Hylocereus undatus) productive chain were carbonized with ZnCl2 to obtain activated carbon and later used in the adsorption of the drug naproxen (NPX) in a batch system. The Freundlich model demonstrated a better adjustment for the equilibrium isotherms. A high adsorption capacity for NPX (158.81 mg g-1) was obtained at 328 K, which can be attributed to the remarkable textural properties of the adsorbent, besides certain functional groups present on its surface. Thermodynamic studies confirmed the endothermic nature of the adsorption process (∆H0 = 0.2898 kJ mol-1). The linear driving force model (LDF) presented a good statistical adjustment to the experimental kinetic data. The application of the material in the treatment of simulated wastewater composed of various pharmaceutical drugs and salts was very promising, reaching 75.7% removal. Therefore, it can be inferred that the application of activated carbon derived from pitaya bark is highly promising in removing the NPX drug and treating synthetic mixtures containing other pharmaceutical substances.
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Affiliation(s)
- Dison S P Franco
- Research Group On Adsorptive and Catalytic Process Engineering (ENGEPAC), Federal University of Santa Maria, Av. Roraima, 1000-7, Santa Maria, RS, 97105-900, Brazil
| | - Kátia da Boit Martinello
- Department of Health Sciences, Universidad de La Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia
| | - Jordana Georgin
- Graduate Program in Civil Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Matias S Netto
- Research Group On Adsorptive and Catalytic Process Engineering (ENGEPAC), Federal University of Santa Maria, Av. Roraima, 1000-7, Santa Maria, RS, 97105-900, Brazil
| | - Edson Luiz Foletto
- Research Group On Adsorptive and Catalytic Process Engineering (ENGEPAC), Federal University of Santa Maria, Av. Roraima, 1000-7, Santa Maria, RS, 97105-900, Brazil
| | - Daniel G A Piccilli
- Graduate Program in Civil Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Luis F O Silva
- Department of Civil and Environmental, Universidad de La Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia
| | - Glaydson S Dos Reis
- Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences, 90183, Umeå, Sweden
| | - Guilherme Luiz Dotto
- Research Group On Adsorptive and Catalytic Process Engineering (ENGEPAC), Federal University of Santa Maria, Av. Roraima, 1000-7, Santa Maria, RS, 97105-900, Brazil.
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Grassi P, Lunardi P, Foletto EL, Dotto GL, Lima EC, Jahn SL. Production of sugar-derived carbons by different routes and their applications for dye removal in water. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.03.054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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de O Salomón YL, Georgin J, Franco DSP, Netto MS, Piccilli DGA, Foletto EL, Manera C, Godinho M, Perondi D, Dotto GL. Development of activated carbon from Schizolobium parahyba (guapuruvu) residues employed for the removal of ketoprofen. Environ Sci Pollut Res Int 2022; 29:21860-21875. [PMID: 34773238 DOI: 10.1007/s11356-021-17422-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 11/04/2021] [Indexed: 06/13/2023]
Abstract
Schizolobium parahyba species can be found in all of South America, producing several residues that can be a major opportunity to develop activated carbon. This work presents the investigation regarding the development of a high specific surface activated carbon (981.55 m2 g-1) and its application in the adsorption of ketoprofen from the aqueous media. The ketoprofen molecules were better adhered to the adsorbent surface under acidic conditions (pH = 2), being the ideal adsorbent dosage determined as 0.7 g L-1, resulting in satisfactory values. It was found that the system reached equilibrium in 200 to 250 min depending on the initial concentration studied, achieving an adsorption capacity of 229 mg g-1. The general order was the most suitable model for describing the experimental data, with an R2 ≥ 0.9985 and MSR ≤ 63.40 (mg g-1)2. The equilibrium adsorption found that the temperature increases the adsorption capacity, achieving 447.35 mg g-1 at 328 K. Besides that, the Tóth model was the most suitable for describing the isotherms R2 ≥ 0.9990 and MSR ≤ 25.67 (mg g-1)2, indicating a heterogeneous adsorbent. The thermodynamic values found that the adsorption of ketoprofen is spontaneous (average ΔG0 of - 32.79 kJ mol-1) and endothermic (ΔH0 10.44 kJ mol-1). The treatment of simulated effluent with the developed adsorbent was efficient, removing 90% of ketoprofen, ibuprofen, and salts. It was found that the adsorbent is reaming its adsorption capacity up to the 5th cycle, progressively decreasing the adsorption capacity until the adsorption does not occur past the 12th cycle. Overall, the results demonstrated that the activated carbon from residual biomass of the Schizolobium parahyba species could be an excellent alternative in obtaining an effective adsorbent to treat wastewater-containing drugs.
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Affiliation(s)
- Yamil L de O Salomón
- Graduate Program in Environmental Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Jordana Georgin
- Graduate Program in Civil Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Dison S P Franco
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Avenue Roraima, 1000, Santa Maria, 97105-900, Brazil
| | - Matias S Netto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Avenue Roraima, 1000, Santa Maria, 97105-900, Brazil
| | - Daniel G A Piccilli
- Graduate Program in Environmental Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Edson Luiz Foletto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Avenue Roraima, 1000, Santa Maria, 97105-900, Brazil
| | - Christian Manera
- Graduate Program in Process Engineering and Technologies, University of Caxias Do Sul (UCS), Caxias do Sul, Rio Grande do Sul, 95070-560, Brazil
| | - Marcelo Godinho
- Graduate Program in Process Engineering and Technologies, University of Caxias Do Sul (UCS), Caxias do Sul, Rio Grande do Sul, 95070-560, Brazil
| | - Daniele Perondi
- Graduate Program in Process Engineering and Technologies, University of Caxias Do Sul (UCS), Caxias do Sul, Rio Grande do Sul, 95070-560, Brazil
| | - Guilherme L Dotto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Avenue Roraima, 1000, Santa Maria, 97105-900, Brazil.
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Salomón YL, Georgin J, Franco DS, Netto MS, Piccilli DG, Foletto EL, Pinto D, Oliveira ML, Dotto GL. Adsorption of atrazine herbicide from water by diospyros kaki fruit waste activated carbon. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117990] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Netto MS, Georgin J, Franco DSP, Mallmann ES, Foletto EL, Godinho M, Pinto D, Dotto GL. Effective adsorptive removal of atrazine herbicide in river waters by a novel hydrochar derived from Prunus serrulata bark. Environ Sci Pollut Res Int 2022; 29:3672-3685. [PMID: 34389956 DOI: 10.1007/s11356-021-15366-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
In this work, a novel and effective hydrochar was prepared by hydrothermal treatment of Prunus serrulata bark to remove the pesticide atrazine in river waters. The hydrothermal treatment has generated hydrochar with a rough surface and small cavities, favoring the atrazine adsorption. The adsorption equilibrium time was not influenced by different atrazine concentrations used, being reached after 240 min. The Elovich adsorption kinetic model presented the best adjustment to the kinetic data. The Langmuir model presented the greatest compliance to the isotherm data and indicated a higher affinity between atrazine and hydrochar, reaching a maximum adsorption capacity of 63.35 mg g-1. Thermodynamic parameters showed that the adsorption process was highly spontaneous, endothermic, and favorable, with a predominance of physical attraction forces. In treating three real river samples containing atrazine, the adsorbent showed high removal efficiency, being above 70 %. The hydrochar from Prunus serrulata bark waste proved highly viable to remove atrazine from river waters due to its high efficiency and low precursor material cost.
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Affiliation(s)
- Matias S Netto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Jordana Georgin
- Graduate Program in Civil Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Dison S P Franco
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Evandro S Mallmann
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Marcelo Godinho
- Postgraduate Program in Engineering Processes and Technology, University of Caxias do Sul - UCS, Caxias do Sul, RS, Brazil
| | - Diana Pinto
- Department of Civil and Environmental, Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia.
- Facultad de Ingeniería y Arquitectura, Universidad de Lima, Lima, Peru.
| | - Guilherme L Dotto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
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Brombilla VDL, Sarmento Lazarotto J, Silvestri S, Anschau KF, Dotto GL, Foletto EL. Biochar derived from yerba-mate (Ilex paraguariensis) as an alternative TiO2 support for enhancement of photocatalytic activity toward Rhodamine-B degradation in water. CHEM ENG COMMUN 2021. [DOI: 10.1080/00986445.2021.1966423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | | | - Siara Silvestri
- Graduate Program in Environmental Engineering, Federal University of Santa Maria, Santa Maria, Brazil
| | | | - Guilherme Luiz Dotto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria, Brazil
| | - Edson Luiz Foletto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria, Brazil
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15
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Hollanda LR, Santos SBF, Faustino JGAA, Dotto GL, Foletto EL, Chiavone-Filho O. Oil field-produced water treatment: characterization, photochemical systems, and combined processes. Environ Sci Pollut Res Int 2021; 28:52744-52763. [PMID: 34467489 DOI: 10.1007/s11356-021-16222-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Accepted: 08/24/2021] [Indexed: 06/13/2023]
Abstract
Produced water, a mixture of inorganic and organic components, comprises the largest effluent stream from oil and gas activities. The removal of contaminants from this wastewater is receiving special attention of the researchers since most of them are persistent and difficult to remove with simple techniques. Several technologies from conventional to advanced oxidation processes have been employed to treat produced water. However, the achievement of greater efficiency may be conditioned to a combination of different wastewater treatment techniques. Hereupon, the present paper discusses three important aspects regarding produced water treatment: analytical methods used for characterization, relevant aspects regarding photochemical systems used for advanced oxidation processes, and combined techniques for treating oil field wastewaters. Analytical methods employed for the quantification of the main species contained in produced water are presented for a proper characterization. Photochemical aspects of the reaction systems such as operating conditions, types of irradiation sources, and technical details of reactors are also addressed. Finally, research papers concerning combined treatment techniques are discussed focusing on the essential contributions. Thus, this manuscript aims to assist in the development of novel techniques and the improvement of produced water treatment to obtain a high-quality treated effluent and reduce environmental impacts.
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Affiliation(s)
- Luana Rabelo Hollanda
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal, 59078-970, Brazil
| | | | | | - Guilherme Luiz Dotto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
| | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Osvaldo Chiavone-Filho
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal, 59078-970, Brazil
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16
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Georgin J, Franco DSP, Netto MS, Piccilli DGA, Foletto EL, Dotto GL. Adsorption investigation of 2,4-D herbicide on acid-treated peanut (Arachis hypogaea) skins. Environ Sci Pollut Res Int 2021; 28:36453-36463. [PMID: 33694109 DOI: 10.1007/s11356-021-12813-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 02/01/2021] [Indexed: 06/12/2023]
Abstract
In this work, peanut (Arachis hypogaea) skin, a by-product generated by the agricultural production of its seeds, was employed as a precursor in the preparation of an adsorbent for the 2,4-D removal in water. The skins were treated with sulfuric acid and characterized by different techniques. The adsorption was favored at acid pH = 2 with pHpzc = 6. The dosage of 0.9 g L-1 was considered ideal, obtaining satisfactory indications of removal and capacity. The kinetic curves were well represented by the general order model, with the equilibrium reached quickly in the first 30 min for all concentrations. Adsorption isotherm studies showed that the increase in temperature negatively affected the herbicide adsorption, obtaining a maximum capacity of 246.72 mg g-1, by the Langmuir isotherm at 298 K. The remarkable adsorption efficiency presented by the adsorbent can be associated with the presence of new functional groups on the adsorbent surface generated after the acid treatment. Thermodynamic parameters confirmed the exothermic nature of the adsorptive system. In the treatment of synthetic wastewater consisting of a mixture of herbicides and salts, a high removal efficiency (72%) of herbicides was obtained. Therefore, the development of an adsorbent derived from peanut (Arachis hypogaea) skin treated with sulfuric acid is an excellent alternative, generating remarkable removal results towards 2,4-D herbicide.
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Affiliation(s)
- Jordana Georgin
- Graduate Program in Civil Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Dison S P Franco
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Avenue Roraima, 1000, Santa Maria, 97105-900, Brazil
| | - Matias S Netto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Avenue Roraima, 1000, Santa Maria, 97105-900, Brazil
| | - Daniel G A Piccilli
- Graduate Program in Civil Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Edson Luiz Foletto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Avenue Roraima, 1000, Santa Maria, 97105-900, Brazil
| | - Guilherme L Dotto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Avenue Roraima, 1000, Santa Maria, 97105-900, Brazil.
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Grassi P, Drumm FC, Georgin J, Franco DSP, Dotto GL, Foletto EL, Jahn SL. Application of Cordia trichotoma sawdust as an effective biosorbent for removal of crystal violet from aqueous solution in batch system and fixed-bed column. Environ Sci Pollut Res Int 2021; 28:6771-6783. [PMID: 33009617 DOI: 10.1007/s11356-020-11005-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Accepted: 09/25/2020] [Indexed: 06/11/2023]
Abstract
In this work, for the first time, Cordia trichotoma sawdust, a residue derived from noble wood processing, was applied as an alternative biosorbent for the removal of crystal violet by discontinuous and continuous biosorption processes. The optimum conditions for biosorption of crystal violet were 7.5 pH and a biosorbent dosage of 0.8 g L-1. The biosorption kinetics showed that the equilibrium was reached at 120 min, achieving a maximum biosorption capacity of 107 mg g-1 for initial dye concentration of 200 mg L-1. The Elovich model was the proper model for representing the biosorption kinetics. The isotherm assays showed that the rise of temperature causes an increase in the biosorption capacity of the crystal violet, with a maximum biosorption capacity of 129.77 mg g-1 at 328 K. The Langmuir model was the most proper model for describing the behavior. The sign of ΔG0 indicates that the process was spontaneous and favorable, whereas the ΔH0 indicates an endothermic process. The treatment of the colored simulated effluent composed by dyes and salts resulted in 80% of color removal. The application of biosorbent in the fixed-bed system achieved a breakthrough time of 505 min, resulting in 83.35% of color removal. The Thomas and Yoon-Nelson models were able to describe the fixed-bed biosorption behavior. This collection of experimental evidence shows that the Cordia trichotoma sawdust can be applied for the removal of crystal violet and a mixture of other dyes that contain them.
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Affiliation(s)
- Patrícia Grassi
- Chemical Engineering Department, Federal University of Santa Maria-UFSM, Roraima Avenue 1000, Santa Maria, RS, 97105-900, Brazil
| | - Fernanda Caroline Drumm
- Chemical Engineering Department, Federal University of Santa Maria-UFSM, Roraima Avenue 1000, Santa Maria, RS, 97105-900, Brazil
| | - Jordana Georgin
- Graduate Program in Civil Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Dison Stracke Pfingsten Franco
- Chemical Engineering Department, Federal University of Santa Maria-UFSM, Roraima Avenue 1000, Santa Maria, RS, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria-UFSM, Roraima Avenue 1000, Santa Maria, RS, 97105-900, Brazil.
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria-UFSM, Roraima Avenue 1000, Santa Maria, RS, 97105-900, Brazil
| | - Sérgio Luiz Jahn
- Chemical Engineering Department, Federal University of Santa Maria-UFSM, Roraima Avenue 1000, Santa Maria, RS, 97105-900, Brazil
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Georgin J, de O Salomón YL, Franco DSP, Netto MS, Piccilli DGA, Foletto EL, Dotto GL. Successful adsorption of bright blue and methylene blue on modified pods of Caesalpinia echinata in discontinuous system. Environ Sci Pollut Res Int 2021; 28:8407-8420. [PMID: 33058060 DOI: 10.1007/s11356-020-11210-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Accepted: 10/09/2020] [Indexed: 06/11/2023]
Abstract
Pods of the forest species Caesalpinia echinata were used as an alternative adsorbent to remove bright blue (BB) and methylene blue (MB) dyes. The raw and acid-treated samples were characterized by techniques like SEM, XRD, and FTIR. The acid-treated pod sample was characterized by an amorphous structure containing several cavities, bumps, and functional groups. The Elovich model was the most satisfactory to describe the adsorption kinetic data. The isothermal studies were better described by the Langmuir model for BB dye, with a maximum capacity of 261 mg g-1, and Tóth model for MB dye, giving a maximum capacity of 288 mg g-1. The thermodynamic study indicated a spontaneous and favorable process and endothermic nature for both dyes. In the treatment of two simulated effluents containing a mixture of different compounds such as dyes and salts, to simulate real wastewaters, the adsorbent was highly efficient, presenting around 80% of color removal for both effluents. Therefore, the acid-treated pods of Caesalpinia echinata have great potential to be applied as an alternative adsorbents in treating colored effluents in discontinuous systems.
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Affiliation(s)
- Jordana Georgin
- Graduate Program in Civil Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Yamil L de O Salomón
- Graduate Program in Environmental Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Dison S P Franco
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Matias S Netto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Daniel G A Piccilli
- Graduate Program in Civil Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Edson Luiz Foletto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Guilherme L Dotto
- Graduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
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Vieira Y, Lima EC, Foletto EL, Dotto GL. Microplastics physicochemical properties, specific adsorption modeling and their interaction with pharmaceuticals and other emerging contaminants. Sci Total Environ 2021; 753:141981. [PMID: 32911167 DOI: 10.1016/j.scitotenv.2020.141981] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 08/06/2020] [Accepted: 08/24/2020] [Indexed: 06/11/2023]
Abstract
This review discusses the imminent threat that microplastics (MPs) associated with pharmaceuticals represent to the aquatic environment and public health. We initially focused upon recognizing and stressing that MPs are ubiquitous pollutants. The influence of environmental factors, such as pH, mechanical stress, and photodegradation, are examined, aiming to elucidate how both substances might associate, what are their simultaneous degradation pathways and, to understand the interactions between MPs and pharmaceuticals. Mathematical tools, such as modeling and simulations, are presented in detail, aiming to improve how information is interpreted. Furthermore, it is exhibited that MPs sorption and interaction behavior towards organic contaminants play an important role in understanding its dynamics in the environment, as well as their possible interactions with pharmaceuticals that are summarized. At last, MPs and pharmaceuticals toxicity and bioaccumulation are presented.
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Affiliation(s)
- Yasmin Vieira
- Department of Chemistry, Federal University of Santa Maria (UFSM), Av. Roraima, 1000-13, 97105-900 Santa Maria, RS, Brazil
| | - Eder C Lima
- Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria (UFSM), Av. Roraima, 1000-7, 97105-900 Santa Maria, RS, Brazil
| | - Guilherme Luiz Dotto
- Department of Chemistry, Federal University of Santa Maria (UFSM), Av. Roraima, 1000-13, 97105-900 Santa Maria, RS, Brazil; Chemical Engineering Department, Federal University of Santa Maria (UFSM), Av. Roraima, 1000-7, 97105-900 Santa Maria, RS, Brazil.
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20
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de Salomón YLO, Georgin J, Franco DSP, Netto MS, Foletto EL, Allasia D, Dotto GL. Application of seed residues from Anadenanthera macrocarpa and Cedrela fissilis as alternative adsorbents for remarkable removal of methylene blue dye in aqueous solutions. Environ Sci Pollut Res Int 2021; 28:2342-2354. [PMID: 32885336 DOI: 10.1007/s11356-020-10635-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 08/25/2020] [Indexed: 06/11/2023]
Abstract
Two novel ecological and low-cost adsorbents were prepared from seed residues of the tree species Anadenanthera macrocarpa and Cedrela fissilis for the removal of methylene blue dye in water. The materials were comminuted and characterized by different techniques. The particles of samples have a rough surface with cavities. The optimum dosage and pH for both materials were 1 g L-1 and pH 8. The pseudo-second-order model was the most suitable for describing the adsorption kinetics for both systems. The Anadenanthera macrocarpa presented a maximum experimental capacity of 228 mg g-1, while the Cedrela fissilis, a similar capacity of 230 mg g-1 at 328 K. The Tóth model was proper for describing the equilibrium curves for both systems. The thermodynamic indicators show that the adsorption process is spontaneous and endothermic for both materials. The application of materials for the simulated effluent treatment showed 74 and 78% of color removal using Anadenanthera macrocarpa and Cedrela fissilis samples, respectively. Overall, seed residues of Anadenanthera macrocarpa and Cedrela fissilis could be potentially applied for adsorptive removal of colored contaminants in wastewater.
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Affiliation(s)
- Yamil L O de Salomón
- Sanitary and Environmental Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Jordana Georgin
- Sanitary and Environmental Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Dison S P Franco
- Chemical Engineering Department, Federal University of Santa Maria-UFSM, Roraima Avenue 1000, Santa Maria, RS, 97105-900, Brazil
| | - Matias Schadeck Netto
- Chemical Engineering Department, Federal University of Santa Maria-UFSM, Roraima Avenue 1000, Santa Maria, RS, 97105-900, Brazil
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria-UFSM, Roraima Avenue 1000, Santa Maria, RS, 97105-900, Brazil
| | - Daniel Allasia
- Sanitary and Environmental Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria-UFSM, Roraima Avenue 1000, Santa Maria, RS, 97105-900, Brazil.
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Grassi P, Drumm FC, Franco DSP, Georgin J, Dotto GL, Foletto EL, Jahn SL. Application of fly ash modified by alkaline fusion as an effective adsorbent to remove methyl violet 10B in water. CHEM ENG COMMUN 2020. [DOI: 10.1080/00986445.2020.1852222] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Patrícia Grassi
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, Brazil
| | - Fernanda C. Drumm
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, Brazil
| | - Dison S. P. Franco
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, Brazil
| | - Jordana Georgin
- Graduate Program in Civil Engineering, Federal University of Santa Maria, Santa Maria, Brazil
| | - Guilherme L. Dotto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, Brazil
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, Brazil
| | - Sérgio L. Jahn
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, Brazil
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Lazarotto JS, Lima Brombilla V, Silvestri S, Foletto EL. Conversion of spent coffee grounds to biochar as promising TiO
2
support for effective degradation of diclofenac in water. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.6001] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Joseane Sarmento Lazarotto
- Graduate Program in Chemical Engineering Federal University of Santa Maria Av. Roraima, 1000‐9B Santa Maria RS 97105‐900 Brazil
| | - Vitória Lima Brombilla
- Graduate Program in Chemical Engineering Federal University of Santa Maria Av. Roraima, 1000‐9B Santa Maria RS 97105‐900 Brazil
| | - Siara Silvestri
- Graduate Program in Environmental Engineering Federal University of Santa Maria Av. Roraima, 1000‐7 Santa Maria RS 97105‐900 Brazil
| | - Edson Luiz Foletto
- Graduate Program in Chemical Engineering Federal University of Santa Maria Av. Roraima, 1000‐9B Santa Maria RS 97105‐900 Brazil
- Graduate Program in Environmental Engineering Federal University of Santa Maria Av. Roraima, 1000‐7 Santa Maria RS 97105‐900 Brazil
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da Silveira Salla J, da Boit Martinello K, Dotto GL, García-Díaz E, Javed H, Alvarez PJ, Foletto EL. Synthesis of citrate–modified CuFeS2 catalyst with significant effect on the photo–Fenton degradation efficiency of bisphenol a under visible light and near–neutral pH. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124679] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Zimmermann BM, Peres EC, Dotto GL, Foletto EL. Decolorization and degradation of methylene blue by photo-Fenton reaction under visible light using an iron-rich clay as catalyst: CCD-RSM design and LC-MS technique. ACTA ACUST UNITED AC 2020. [DOI: 10.5902/2236117040800] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In this work, an iron-rich bentonite was thermally modified at 200 oC and posteriorly used as a heterogeneous catalyst in the decolorization and degradation of methylene blue dye (MB) by photo-Fenton reaction under visible irradiation. The variables such as catalyst concentration and pH were investigated in the reaction system to detect the optimal decolorization conditions using the response surface methodology (RSM) coupled with Central Composite Design (CCD). Photodegradation of MB was analyzed by LC-MS technique. The results indicated that the optimal conditions to obtain 94% of MB decolorization efficiency were pH = 2.4 and catalyst mass = 0.02 g. It was also possible to verify that the simultaneous combination of catalyst, hydrogen peroxide and visible light in the reaction medium was primordial for the increasing MB decolorization efficiency. MB degradation occurred partially at 180 min of photo-Fenton reaction, since the presence of dye in the solution was reduced, leading to its transformation into different intermediate products. Therefore, the catalyst used in this work has demonstrated a great potential for the degradation of cationic dye, allowing its use in advanced oxidation processes
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Cadore-Rodrigues AC, Prochnow C, Rippe MP, Oliveira JSD, Jahn SL, Foletto EL, Pereira GKR, Valandro LF. Air-abrasion using new silica-alumina powders containing different silica concentrations: Effect on the microstructural characteristics and fatigue behavior of a Y-TZP ceramic. J Mech Behav Biomed Mater 2019; 98:11-19. [DOI: 10.1016/j.jmbbm.2019.05.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 05/20/2019] [Accepted: 05/21/2019] [Indexed: 12/20/2022]
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Schadeck Netto M, Leindcker Rossatto D, Jahn SL, Stoffels Mallmann E, Luiz Dotto G, Luiz Foletto E. Preparation of a novel magnetic geopolymer/zero–valent iron composite with remarkable adsorption performance towards aqueous Acid Red 97. CHEM ENG COMMUN 2019. [DOI: 10.1080/00986445.2019.1635467] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Affiliation(s)
- Matias Schadeck Netto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, Brazil
| | | | - Sérgio Luiz Jahn
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, Brazil
| | | | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, Brazil
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, Brazil
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Silvestri S, Stefanello N, da Silveira Salla J, Foletto EL. Photocatalytic properties of Zn2SnO4 powders prepared by different modified hydrothermal routes. Res Chem Intermed 2019. [DOI: 10.1007/s11164-019-03832-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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May MM, Marchionatti AME, Valandro LF, Foletto EL, Dorneles LS, May LG. Y-TZP surface treatments and their effects on the bond strength to resin cement. Braz J Oral Sci 2019. [DOI: 10.20396/bjos.v18i0.8655141] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Aim: This study evaluated the effect of surface treatments of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramics on their bond strength to a resin cement. Methods: Seventy zirconia blocks (6 × 6 × 2 mm3, IPS e.max ZirCAD) were assigned into 7 groups (n=10) – as-sintered (AS), no treatment; tribochemical silica coating + silanization (TBS; Cojet-sand; ProSil); airabrasion with 45 μm alumina particles + universal primer (AAP; Monobond®Plus); fusion sputtering (FS); SiO2 nanofilm + silanization (SN; ProSil); FS+SN+ silanization (FSSN; ProSil); FS+SN+Universal Primer (FSSNP; Monobond®Plus). Afterwards, a resin cement (RelyX™ ARC) was applied inside cylinders (Ø = 0.96 mm × 1 mm height) placed on the zirconia surfaces. Microshear bond strength tests (μSBS) were carried out (1 mm/min). Failure and phase transformation analysis were performed. Bond strength data (MPa) were subjected to Kruskal-Wallis/Mann Whitney tests. Results: TBS (27 ± 1.2) and AAP (24.7 ± 0.8) showed higher bond strengths than the other groups, followed by FSSNP (15.5 ± 4.2) and FSSN (13.3 ± 3.6). FS (3.4 ± 0.44) and SN (9.5 ± 2.7) showed the lowest values (p < 0.001). Most of the specimens exhibited an adhesive failure. Conclusion: Air-abrasion by silica-coated alumina particles followed by silanization or by alumina particles followed by universal primer resulted in the highest resin bond strength to zirconia. Fusion sputtering and silica nanofilm deposition induced low strengths. However, when these methods are applied in combination and with a primer (FSSN and FSSNP), higher bond strengths may be achieved. Low bond strengths are obtained when no zirconia treatment is performed.
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da Cruz Severo E, Dotto GL, Martínez-de la Cruz A, Cuellar EL, Foletto EL. Enhanced photocatalytic activity of BiVO 4 powders synthesized in presence of EDTA for the decolorization of rhodamine B from aqueous solution. Environ Sci Pollut Res Int 2018; 25:34123-34130. [PMID: 30284166 DOI: 10.1007/s11356-018-3370-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 09/27/2018] [Indexed: 05/27/2023]
Abstract
Bismuth vanadate (BiVO4) powders were successfully synthesized in presence of EDTA via microwave irradiation and used as photocatalysts in the oxidation reaction of rhodamine B (rhB) under visible light. Different concentrations of EDTA (0.5 to 10%) to chelate Bi3+ ions were employed on the BiVO4 synthesis. Under the presence of EDTA, a monoclinic crystalline structure was obtained, whereas a mixture of monoclinic and tetragonal phases was observed in the absence of EDTA. In addition, the use of different EDTA concentrations promoted the formation the different shapes of particles. The BiVO4 sample synthesized with low concentration of EDTA (0.5%) exhibited about 85% of rhB decolorization in 300 min at pH 7.5. Therefore, this high efficiency can be attributed to a combination of intrinsic properties such as the morphology type and monoclinic structure of BiVO4 particles.
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Affiliation(s)
- Eric da Cruz Severo
- Postgraduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Postgraduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil.
| | - Azael Martínez-de la Cruz
- Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, 66451, San Nicolás de los Garza, NL, Mexico
| | - Enrique López Cuellar
- Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, 66451, San Nicolás de los Garza, NL, Mexico
| | - Edson Luiz Foletto
- Postgraduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
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Fröhlich AC, Dos Reis GS, Pavan FA, Lima ÉC, Foletto EL, Dotto GL. Improvement of activated carbon characteristics by sonication and its application for pharmaceutical contaminant adsorption. Environ Sci Pollut Res Int 2018; 25:24713-24725. [PMID: 29923049 DOI: 10.1007/s11356-018-2525-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Accepted: 06/10/2018] [Indexed: 06/08/2023]
Abstract
Sonicated activated carbon (SAC) was developed and used to remove ibuprofen and ketoprofen from aqueous media by adsorption. A standard activated carbon sample (AC) was used as comparison. Both adsorbents were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), N2 adsorption isotherms (Brunauer, Emmett, and Teller (BET)), helium gas pycnometry, and scanning electron microscopy (SEM). In the adsorption study, kinetics, equilibrium, and thermodynamics were evaluated. SAC presented better characteristics than AC. Pseudo-second-order model was adequate to predict the kinetic curves. The isotherm data obeyed the Sips model. Thermodynamic results revealed a spontaneous and endothermic process, where physisorption was involved. The maximum adsorption capacities of SAC were 134.5 and 89.2 mg g-1 for ibuprofen and ketoprofen, respectively. For AC, the maximum adsorption capacities were 115.1 and 79.1 mg g-1 for ibuprofen and ketoprofen, respectively. The sonication technique presented great potential to improve the AC characteristics, generating a promising material (SAC) for ibuprofen and ketoprofen adsorption.
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Affiliation(s)
- Andressa Cristiana Fröhlich
- Chemical Engineering Department, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil
- Department of Chemistry, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil
| | - Glaydson Simoes Dos Reis
- Graduate Program in Metallurgical, Mine and Materials Engineering (PPGE3M), School of Engineering, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Porto Alegre, RS, Brazil
- The French Institute of Science and Technology for Transport, Spatial Planning, Development and Networks (IFSTTAR), MAST, GPEM, F-44344, Bouguenais, France
| | | | - Éder Cláudio Lima
- Institute of Chemistry, Federal University of Rio Grande do Sul, UFRGS, Av. Bento Gonçalves 9500, P.O. Box 15003, Porto Alegre, RS, 91501-970, Brazil
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil
- Department of Chemistry, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil.
- Department of Chemistry, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil.
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Mota ALN, Neto LGL, Foletto EL, Chiavone-Filho O, Nascimento CAOD. Analysis of solar and artificial UVA irradiations on the photo-Fenton treatment of phenolic effluent and oilfield produced water. CHEM ENG COMMUN 2018. [DOI: 10.1080/00986445.2018.1463524] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- André Luís Novais Mota
- Department of Environmental Science and Technology, Federal University of Rural Semi-Arid, Mossoró, Brazil
| | - Luiz Gonzaga Lopes Neto
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, Brazil
| | - Osvaldo Chiavone-Filho
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal, Brazil
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Georgin J, da Silva Marques B, da Silveira Salla J, Foletto EL, Allasia D, Dotto GL. Removal of Procion Red dye from colored effluents using H 2SO 4-/HNO 3-treated avocado shells (Persea americana) as adsorbent. Environ Sci Pollut Res Int 2018; 25:6429-6442. [PMID: 29249030 DOI: 10.1007/s11356-017-0975-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Accepted: 12/06/2017] [Indexed: 05/10/2023]
Abstract
The treatment of colored effluents containing Procion Red dye (PR) was investigated using H2SO4 and HNO3 modified avocado shells (Persea americana) as adsorbents. The adsorbent materials (AS-H2SO4 and AS-HNO3) were properly characterized. The adsorption study was carried out considering the effects of adsorbent dosage and pH. Kinetic, equilibrium, and thermodynamic aspects were also evaluated. Finally, the adsorbents were tested to treat simulated dye house effluents. For both materials, the adsorption was favored using 0.300 g L-1 of adsorbent at pH 6.5, where, more than 90% of PR was removed from the solution. General order model was able to explain the adsorption kinetics for both adsorbents. The Sips model was adequate to represent the isotherm data, being the maximum adsorption capacities of 167.0 and 212.6 mg g-1 for AS-H2SO4 and AS-HNO3, respectively. The adsorption processes were thermodynamically spontaneous, favorable (- 17.0 < ΔG 0 < - 13.2 kJ mol-1), and exothermic (ΔH 0 values of - 29 and - 55 kJ mol-1). AS-H2SO4 and AS-HNO3 were adequate to treat dye house effluents, attaining color removal percentages of 82 and 75%. Avocado shells, after a simple acid treatment, can be a low-cost option to treat colored effluents.
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Affiliation(s)
- Jordana Georgin
- Environmental and Sanitary Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Bianca da Silva Marques
- Chemical Engineering Department, Federal University of Santa Maria UFSM, 1000 Roraima Avenue, Santa Maria, RS, 97105-900, Brazil
| | - Julia da Silveira Salla
- Chemical Engineering Department, Federal University of Santa Maria UFSM, 1000 Roraima Avenue, Santa Maria, RS, 97105-900, Brazil
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria UFSM, 1000 Roraima Avenue, Santa Maria, RS, 97105-900, Brazil
| | - Daniel Allasia
- Environmental and Sanitary Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria UFSM, 1000 Roraima Avenue, Santa Maria, RS, 97105-900, Brazil.
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Drumm FC, de Oliveira JS, Foletto EL, Dotto GL, Moraes Flores EM, Peters Enders MS, Müller EI, Janh SL. Response surface methodology approach for the optimization of tartrazine removal by heterogeneous photo-Fenton process using mesostructured Fe2O3-suppoted ZSM-5 prepared by chitin-templating. CHEM ENG COMMUN 2018. [DOI: 10.1080/00986445.2017.1402009] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Fernanda Caroline Drumm
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | | | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Guilherme Luiz Dotto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | | | | | - Edson Irineu Müller
- Department of Chemistry, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Sérgio Luiz Janh
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, RS, Brazil
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Wandscher VF, Fraga S, Pozzobon JL, Soares FZM, Foletto EL, May LG, Valandro LF. Tribochemical Glass Ceramic Coating as a New Approach for Resin Adhesion to Zirconia. J Adhes Dent 2017; 18:435-440. [PMID: 27669635 DOI: 10.3290/j.jad.a36892] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE To investigate the effects of a novel tribochemical silica coating technique with powders made from feldspathic ceramic and leucite-based ceramic on the bond strength of zirconia to resin cement before and after aging. MATERIALS AND METHODS Zirconia blocks were divided into 3 groups according to the material used for airborne-particle abrasion: 1) SP (control): silica-coated alumina particles; 2) FP: feldspathic ceramic powder; 3) LP: leucite glass-ceramic powder. After silanization, composite resin cylinders were cemented on the zirconia surface using a dual-curing resin cement. Prior to the shear bond strength (SBS) test, half of the samples (n = 15) were stored in distilled water for 24 h; the other half (n = 15) were submitted to aging (10,000 thermocycles of 5°C to 55°C; 150 days of water storage). The bond strength data were analyzed using two-way ANOVA and Tukey's test (α = 0.05). Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and x-ray diffraction analysis were performed. RESULTS The initial bond strengths did not differ significantly between the groups (p = 0.053). However, after aging procedures, airborne-particle abrasion with feldspathic ceramic powder (FP) resulted in higher values of bond strength (p = 0.0001). SEM and EDS indicated that all the treatments promoted silica deposition on the Y-TZP surface ceramic. Airborne-particle abrasion with FP and LP induced a lower percentage of the monoclinic phase. CONCLUSION Airborne abrasion with fine feldspathic ceramic particles is a novel tribochemical technique and appears to be suitable for improving the bond strength between zirconia and resin cements.
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Foletto VS, Ferreira AB, da Cruz Severo E, Collazzo GC, Foletto EL, Dotto GL. Iron-based adsorbent prepared from Litchi peel biomass via pyrolysis process for the removal of pharmaceutical pollutant from synthetic aqueous solution. Environ Sci Pollut Res Int 2017; 24:10547-10556. [PMID: 28281077 DOI: 10.1007/s11356-017-8745-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 03/01/2017] [Indexed: 06/06/2023]
Abstract
A porous iron-based adsorbent obtained from litchi peel via pyrolysis process was prepared in this work, in order to evaluate its adsorptive potential for the removal of a pharmaceutical dye (amaranth) from aqueous solution. The material was characterized by X-ray diffraction, nitrogen adsorption-desorption isotherms, and scanning electron microscopy. Several isotherm and kinetic models were tested aiming to represent the amaranth dye adsorption. The prepared sample presented magnetic property, and a mesoporous texture constituted of graphite and three iron-based phases. The adsorption kinetics of amaranth on the adsorbent followed the pseudo-second-order model, whereas the equilibrium data were in good agreement with the BET isotherm, being represented by a sigmoid-shaped adsorption isotherm. The maximum adsorption capacity for the amaranth dye was found to be 44.87 mg g-1, demonstrating that the material prepared in this work showed to be a promising adsorbent for the removal of amaranth from aqueous solution.
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Affiliation(s)
- Vitória Segabinazzi Foletto
- Chemical Engineering Department, Federal University of Santa Maria (UFSM), 1000 Roraima Avenue, Santa Maria, 97105-900, Brazil
| | - Ananda Bulegon Ferreira
- Chemical Engineering Department, Federal University of Santa Maria (UFSM), 1000 Roraima Avenue, Santa Maria, 97105-900, Brazil
| | - Eric da Cruz Severo
- Chemical Engineering Department, Federal University of Santa Maria (UFSM), 1000 Roraima Avenue, Santa Maria, 97105-900, Brazil
| | - Gabriela Carvalho Collazzo
- Chemical Engineering Department, Federal University of Santa Maria (UFSM), 1000 Roraima Avenue, Santa Maria, 97105-900, Brazil
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria (UFSM), 1000 Roraima Avenue, Santa Maria, 97105-900, Brazil
| | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria (UFSM), 1000 Roraima Avenue, Santa Maria, 97105-900, Brazil.
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Dotto GL, Meili L, de Souza Abud AK, Tanabe EH, Bertuol DA, Foletto EL. Comparison between Brazilian agro-wastes and activated carbon as adsorbents to remove Ni(II) from aqueous solutions. Water Sci Technol 2016; 73:2713-2721. [PMID: 27232408 DOI: 10.2166/wst.2016.095] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This research was performed to find an alternative, low-cost, competitive, locally available and efficient adsorbent to treat nickel (Ni) containing effluents. For this purpose, several Brazilian agro-wastes like sugarcane bagasse (SCB), passion fruit wastes (PFW), orange peel (OP) and pineapple peel (PP) were compared with an activated carbon (AC). The adsorbents were characterized. Effects of fundamental factors affecting the adsorption were investigated using batch tests. Kinetic and equilibrium studies were performed using conventional models. It was verified that the adsorption was favored at pH of 6.0 for all agro-wastes, being dependent of the Ni speciation, point of zero charge and surface area of the adsorbents. The Ni removal percentage was in the following order: SCB > OP > AC > PFW > PP. From the kinetic viewpoint, the Elovich model was appropriate to fit the Ni adsorption onto SCB, while for the other adsorbents, the pseudo-first-order model was the most suitable. For all adsorbents, the Langmuir model was the more adequate to represent the equilibrium data, being the maximum adsorption capacities of 64.1 mg g(-1), 60.7 mg g(-1), 63.1 mg g(-1), 48.1 mg g(-1) and 64.3 mg g(-1) for SCB, PFW, OP, PP and AC, respectively. These results indicated that mainly SCB and OP can be used as alternative adsorbents to treat Ni containing effluents.
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Affiliation(s)
- Guilherme Luiz Dotto
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria, Santa Maria 97105-900, Brazil E-mail:
| | - Lucas Meili
- Separation Systems and Process Optimization Laboratory, Center of Technology, Federal University of Alagoas, Maceió 57072-970, Brazil
| | - Ana Karla de Souza Abud
- Food Technology Department, Center of Exact Sciences and Technology, Federal University of Sergipe, Aracaju 49100-000, Brazil
| | - Eduardo Hiromitsu Tanabe
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria, Santa Maria 97105-900, Brazil E-mail:
| | - Daniel Assumpção Bertuol
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria, Santa Maria 97105-900, Brazil E-mail:
| | - Edson Luiz Foletto
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria, Santa Maria 97105-900, Brazil E-mail:
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da Cruz Severo E, Anchieta CG, Foletto VS, Kuhn RC, Collazzo GC, Mazutti MA, Foletto EL. Degradation of Amaranth azo dye in water by heterogeneous photo-Fenton process using FeWO4 catalyst prepared by microwave irradiation. Water Sci Technol 2016; 73:88-94. [PMID: 26744938 DOI: 10.2166/wst.2015.469] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
FeWO4 particles were synthesized by a simple, rapid and facile microwave technique and their catalytic properties in heterogeneous photo-Fenton reaction were evaluated. This material was employed in the degradation of Amaranth azo dye. Individual and interactive effects of operational parameters such as pH, dye concentration and H2O2 dosage on the decolorization efficiency of Amaranth dye were evaluated by 2(3) central composite design. According to characterization techniques, a porous material and a well-crystallized phase of FeWO4 oxide were obtained. Regarding the photo-Fenton reaction assays, up to 97% color and 58% organic carbon removal were achieved in the best experimental conditions. In addition, the photo-Fenton process maintained treatment efficiency over five catalyst reuse cycles to indicate the durability of the FeWO4 catalyst. In summary, the results reveal that the synthesized FeWO4 material is a promising catalyst for wastewater treatment by heterogeneous photo-Fenton process.
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Affiliation(s)
- Eric da Cruz Severo
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, Brazil E-mail:
| | - Chayene Gonçalves Anchieta
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, Brazil E-mail:
| | | | - Raquel Cristine Kuhn
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, Brazil E-mail:
| | - Gabriela Carvalho Collazzo
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, Brazil E-mail:
| | - Marcio Antonio Mazutti
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, Brazil E-mail:
| | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, Brazil E-mail:
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Marques Junior JM, Muller ALH, Foletto EL, da Costa AB, Bizzi CA, Irineu Muller E. Determination of propranolol hydrochloride in pharmaceutical preparations using near infrared spectrometry with fiber optic probe and multivariate calibration methods. J Anal Methods Chem 2015; 2015:795102. [PMID: 25861516 PMCID: PMC4377514 DOI: 10.1155/2015/795102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 01/19/2015] [Accepted: 02/13/2015] [Indexed: 06/04/2023]
Abstract
A method for determination of propranolol hydrochloride in pharmaceutical preparation using near infrared spectrometry with fiber optic probe (FTNIR/PROBE) and combined with chemometric methods was developed. Calibration models were developed using two variable selection models: interval partial least squares (iPLS) and synergy interval partial least squares (siPLS). The treatments based on the mean centered data and multiplicative scatter correction (MSC) were selected for models construction. A root mean square error of prediction (RMSEP) of 8.2 mg g(-1) was achieved using siPLS (s2i20PLS) algorithm with spectra divided into 20 intervals and combination of 2 intervals (8501 to 8801 and 5201 to 5501 cm(-1)). Results obtained by the proposed method were compared with those using the pharmacopoeia reference method and significant difference was not observed. Therefore, proposed method allowed a fast, precise, and accurate determination of propranolol hydrochloride in pharmaceutical preparations. Furthermore, it is possible to carry out on-line analysis of this active principle in pharmaceutical formulations with use of fiber optic probe.
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Affiliation(s)
| | | | - Edson Luiz Foletto
- Departamento de Engenharia Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Adilson Ben da Costa
- Departamento de Biologia e Farmácia, Laboratório de Limnologia, Universidade de Santa Cruz do Sul, 96815-900 Santa Cruz do Sul, RS, Brazil
| | - Cezar Augusto Bizzi
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Edson Irineu Muller
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
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da Silva SS, Chiavone-Filho O, de Barros Neto EL, Foletto EL. Oil removal from produced water by conjugation of flotation and photo-Fenton processes. J Environ Manage 2015; 147:257-63. [PMID: 25239685 DOI: 10.1016/j.jenvman.2014.08.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 06/05/2014] [Accepted: 08/27/2014] [Indexed: 05/21/2023]
Abstract
The present work investigates the conjugation of flotation and photo-Fenton techniques on oil removal performance from oilfield produced water. The experiments were conducted in a column flotation and annular lamp reactor for induced air flotation and photodegradation steps, respectively. A nonionic surfactant was used as a flotation agent. The flotation experimental data were analyzed in terms of a first-order kinetic rate model. Two experimental designs were employed to evaluate the oil removal efficiency: fractional experimental design and central composite rotational design (CCRD). Overall oil removal of 99% was reached in the optimum experimental condition after 10 min of flotation followed by 45 min of photo-Fenton. The results of the conjugation of induced air flotation and photo-Fenton processes allowed meeting the wastewater limits established by the legislations for disposal.
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Affiliation(s)
- Syllos Santos da Silva
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal 59072-970, Brazil
| | - Osvaldo Chiavone-Filho
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal 59072-970, Brazil
| | | | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, Brazil.
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Gomes CSM, de Oliveira HNM, Chiavone-Filho O, Foletto EL. Vapor–liquid equilibria for ethyl acetate+methanol and ethyl acetate+ethanol mixtures: Experimental verification and prediction. Chem Eng Res Des 2014. [DOI: 10.1016/j.cherd.2014.07.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Anchieta CG, Cancelier A, Mazutti MA, Jahn SL, Kuhn RC, Gündel A, Chiavone-Filho O, Foletto EL. Effects of Solvent Diols on the Synthesis of ZnFe₂O₄ Particles and Their Use as Heterogeneous Photo-Fenton Catalysts. Materials (Basel) 2014; 7:6281-6290. [PMID: 28788191 PMCID: PMC5456135 DOI: 10.3390/ma7096281] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 08/15/2014] [Accepted: 08/18/2014] [Indexed: 11/16/2022]
Abstract
A solvothermal method was used to prepare zinc ferrite spinel oxide (ZnFe₂O₄) using ethylene glycol and 1,4 butanediol as solvent diols, and the influence of diols on the physical properties of ZnFe₂O₄ particles was investigated. The produced particles were characterized by X-ray powder diffraction (XRD), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR) and nitrogen adsorption isotherms, and the catalytic activity for the organic pollutant decomposition by heterogeneous photo-Fenton reaction was investigated. Both solvents produced particles with cubic spinel structure. Microporous and mesoporous structures were obtained when ethylene glycol and 1,4 butanediol were used as diols, respectively. A higher pore volume and surface area, as well as a higher catalytic activity for the pollutant degradation were found when 1,4 butanediol was used as solvent.
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Affiliation(s)
| | - Adriano Cancelier
- Department of Chemical Engineering, Federal University of Santa Maria, 97105-900 Santa Maria, Brazil.
| | - Marcio Antonio Mazutti
- Department of Chemical Engineering, Federal University of Santa Maria, 97105-900 Santa Maria, Brazil.
| | - Sérgio Luiz Jahn
- Department of Chemical Engineering, Federal University of Santa Maria, 97105-900 Santa Maria, Brazil.
| | - Raquel Cristine Kuhn
- Department of Chemical Engineering, Federal University of Santa Maria, 97105-900 Santa Maria, Brazil.
| | - Andre Gündel
- Department of Physics, Federal University of Pampa, 96413-170 Bagé, Brazil.
| | - Osvaldo Chiavone-Filho
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, 59066-800 Natal, Brazil.
| | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, 97105-900 Santa Maria, Brazil.
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Luna AJ, Nascimento CAO, Foletto EL, Moraes JEF, Chiavone-Filhoe O. Photo-Fenton degradation of phenol, 2,4-dichlorophenoxyacetic acid and 2,4-dichlorophenol mixture in saline solution using a falling-film solar reactor. Environ Technol 2014; 35:364-371. [PMID: 24600876 DOI: 10.1080/09593330.2013.828762] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this work, a saline aqueous solution of phenol, 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4-dichlorophenol (2,4-DCP) was treated by the photo-Fenton process in a falling-film solar reactor. The influence of the parameters such as initial pH (5-7), initial concentration of Fe2+ (1-2.5mM) and rate of H202 addition (1.87-3.74mmol min-1) was investigated. The efficiency of photodegradation was determined from the removal of dissolved organic carbon (DOC), described by the species degradation of phenol, 2,4-D and 2,4-DCP. Response surface methodology was employed to assess the effects of the variables investigated, i.e. [Fe2+], [H202] and pH, in the photo-Fenton process with solar irradiation. The results reveal that the variables' initial concentration of Fe2+ and H202 presents predominant effect on pollutants' degradation in terms of DOC removal, while pH showed no influence. Under the most adequate experimental conditions, about 85% DOC removal was obtained in 180 min by using a reaction system employed here, and total removal of phenol, 2,4- and 2,4-DCP mixture in about 30min.
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Affiliation(s)
- Airton J Luna
- National Institute of lndustrial Property, Rio de Janeiro 20090-910, Brazil
| | - Cláudio A O Nascimento
- Department of Chemical Engineering, University of São Paulo, São Paulo 05508-900, Brazil
| | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, Brazil
| | - José E F Moraes
- Department of Chemical Engineering, Federal University of São Paulo, São Paulo 09972-270, Brazil
| | - Osvaldo Chiavone-Filhoe
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal 59066-800, Brazil
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Weber CT, Collazzo GC, Mazutti MA, Foletto EL, Dotto GL. Removal of hazardous pharmaceutical dyes by adsorption onto papaya seeds. Water Sci Technol 2014; 70:102-107. [PMID: 25026586 DOI: 10.2166/wst.2014.200] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Papaya (Carica papaya L.) seeds were used as adsorbent to remove toxic pharmaceutical dyes (tartrazine and amaranth) from aqueous solutions, in order to extend application range. The effects of pH, initial dye concentration, contact time and temperature were investigated. The kinetic data were evaluated by the pseudo first-order, pseudo second-order and Elovich models. The equilibrium was evaluated by the Langmuir, Freundlich and Temkin isotherm models. It was found that adsorption favored a pH of 2.5, temperature of 298 K and equilibrium was attained at 180-200 min. The adsorption kinetics followed the pseudo second-order model, and the equilibrium was well represented by the Langmuir model. The maximum adsorption capacities were 51.0 and 37.4 mg g(-1) for tartrazine and amaranth, respectively. These results revealed that papaya seeds can be used as an alternative adsorbent to remove pharmaceutical dyes from aqueous solutions.
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Affiliation(s)
- Caroline Trevisan Weber
- Chemical Engineering Department, Federal University of Santa Maria, 97105-900, Santa Maria, Brazil E-mail:
| | - Gabriela Carvalho Collazzo
- Chemical Engineering Department, Federal University of Santa Maria, 97105-900, Santa Maria, Brazil E-mail:
| | - Marcio Antonio Mazutti
- Chemical Engineering Department, Federal University of Santa Maria, 97105-900, Santa Maria, Brazil E-mail:
| | - Edson Luiz Foletto
- Chemical Engineering Department, Federal University of Santa Maria, 97105-900, Santa Maria, Brazil E-mail:
| | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria, 97105-900, Santa Maria, Brazil E-mail:
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Foletto EL, Weber CT, Bertuol DA, Mazutti MA. Application of Papaya Seeds as a Macro-/Mesoporous Biosorbent for the Removal of Large Pollutant Molecule from Aqueous Solution: Equilibrium, Kinetic, and Mechanism Studies. SEP SCI TECHNOL 2013. [DOI: 10.1080/01496395.2013.808213] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Linhares B, Weber CT, Foletto EL, Paz DS, Mazutti MA, Collazzo GC. Activated carbon prepared from yerba mate used as a novel adsorbent for removal of tannery dye from aqueous solution. Environ Technol 2013; 34:2401-2406. [PMID: 24350496 DOI: 10.1080/09593330.2013.770562] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Activated carbon prepared from yerba mate (Ilex paraguariensis) was used as adsorbent for the removal of tannery dye from aqueous solution. The activated carbon was characterized, and it showed a mesoporous texture, with surface area of 537.4 m2 g(-1). The initial dye concentration, contact time and pH influenced the adsorption capacity. The equilibrium data were in good agreement with both Langmuir and Freundlich isotherms. The adsorption kinetics of the tannery dye on activated carbon prepared from yerba mate followed a pseudo-second-order model. The adsorption process was found to be controlled by both external mass-transfer and intraparticle diffusion, but the external diffusion was the dominating process. This work highlights the potential application of activated carbon produced from yerba mate in the field of adsorption.
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Affiliation(s)
- Bruno Linhares
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, Brazil
| | | | - Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, Brazil
| | - Diego Silva Paz
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, Brazil
| | - Marcio A Mazutti
- Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria, Brazil
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Foletto EL, Weber CT, Paz DS, Mazutti MA, Meili L, Bassaco MM, Collazzo GC. Adsorption of leather dye onto activated carbon prepared from bottle gourd: equilibrium, kinetic and mechanism studies. Water Sci Technol 2013; 67:201-209. [PMID: 23128640 DOI: 10.2166/wst.2012.555] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Activated carbon prepared from bottle gourd has been used as adsorbent for removal of leather dye (Direct Black 38) from aqueous solution. The activated carbon obtained showed a mesoporous texture, with surface area of 556.16 m(2) g(-1), and a surface free of organic functional groups. The initial dye concentration, contact time and pH significantly influenced the adsorption capacity. In the acid region (pH 2.5) the adsorption of dye was more favorable. The adsorption equilibrium was attained after 60 min. Equilibrium data were analyzed by the Langmuir, Freundlich, Dubinin-Radushkevich and Temkin isotherm models. The equilibrium data were best described by the Langmuir isotherm, with maximum adsorption capacity of 94.9 mg g(-1). Adsorption kinetic data were fitted using the pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion models. The adsorption kinetic was best described by the second-order kinetic equation. The adsorption process was controlled by both external mass transfer and intraparticle diffusion. Activated carbon prepared from bottle gourd was shown to be a promising material for adsorption of Direct Black 38 from aqueous solution.
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Affiliation(s)
- Edson Luiz Foletto
- Department of Chemical Engineering, Federal University of Santa Maria, 97105-900, Brazil.
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Antes FG, Pereira JSF, Diehl LO, Pereira LSF, Boeck P, Guimarães RCL, Guarnieri RA, Ferreira BMS, Santos MDFPD, Foletto EL, Flores EMM. Sediment Removal from Crude Oil Emulsion using Microwave Radiation. J BRAZIL CHEM SOC 2013. [DOI: 10.5935/0103-5053.20130163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Collazzo GC, Foletto EL, Jahn SL, Villetti MA. Degradation of Direct Black 38 dye under visible light and sunlight irradiation by N-doped anatase TIO₂ as photocatalyst. J Environ Manage 2012; 98:107-111. [PMID: 22257572 DOI: 10.1016/j.jenvman.2011.12.029] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Revised: 12/12/2011] [Accepted: 12/28/2011] [Indexed: 05/31/2023]
Abstract
The N-doped TiO(2) photocatalyst was prepared by calcination of a hydrolysis product composed of titanium (IV) isopropoxide with ammonia as the precipitator. X-ray diffraction, surface area, XPS and UV-vis spectra analyses showed a nanosized anatase structure and the appearance of a new absorption band in the visible region caused by nitrogen doping. The degradation of Direct Black 38 dye on the nitrogen-doped TiO(2) photocatalyst was investigated under visible light and sunlight irradiation. The N-doped anatase TiO(2) demonstrated excellent photocatalytic activity under visible light. Under sunlight irradiation, the N-doped sample showed slightly higher activity than that of the non-doped sample.
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Affiliation(s)
- Gabriela Carvalho Collazzo
- Department of Chemical Engineering, Federal University of Santa Maria, 97105-900, Santa Maria, RS, Brazil.
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