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Khataee A, Karimi A, Zarei M, Joo SW. Eu-doped ZnO nanoparticles: Sonochemical synthesis, characterization, and sonocatalytic application. ULTRASONICS SONOCHEMISTRY 2020; 67:102822. [PMID: 25843900 DOI: 10.1016/j.ultsonch.2015.03.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 03/24/2015] [Accepted: 03/25/2015] [Indexed: 06/04/2023]
Abstract
Undoped and europium (III)-doped ZnO nanoparticles were prepared by a sonochemical method. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) analysis. The crystalline sizes of undoped and 3% Eu-doped ZnO were found to be 16.04 and 8.22nm, respectively. The particle size of Eu-doped ZnO nanoparticles was much smaller than that of pure ZnO. The synthesized nanocatalysts were used for the sonocatalytic degradation of Acid Red 17. Among the Eu-doped ZnO catalysts, 3% Eu-doped ZnO nanoparticles showed the highest sonocatalytic activity. The effects of various parameters such as catalyst loading, initial dye concentration, pH, ultrasonic power, the effect of oxidizing agents, and the presence of anions were investigated. The produced intermediates of the sonocatalytic process were monitored by GC-Mass (GC-MS) spectrometry.
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Affiliation(s)
- Alireza Khataee
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran.
| | - Atefeh Karimi
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran
| | - Mahmoud Zarei
- Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran
| | - Sang Woo Joo
- School of Mechanical Engineering, Yeungnam University, 712-749 Gyeongsan, South Korea.
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The Sonophotocatalytic Degradation of Pharmaceuticals in Water by MnOx-TiO2 Systems with Tuned Band-Gaps. Catalysts 2019. [DOI: 10.3390/catal9110949] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Advanced oxidation processes (AOPs) are technologies to degrade organic pollutants to carbon dioxide and water with an eco-friendly approach to form reactive hydroxyl radicals. Photocatalysis is an AOP whereby TiO2 is the most adopted photocatalyst. However, TiO2 features a wide (3.2 eV) and fast electron-hole recombination. When Mn is embedded in TiO2, it shifts the absorption wavelength towards the visible region of light, making it active for natural light applications. We present a systematic study of how the textural and optical properties of Mn-doped TiO2 vary with ultrasound applied during synthesis. We varied ultrasound power, pulse length, and power density (by changing the amount of solvent). Ultrasound produced mesoporous MnOx-TiO2 powders with a higher surface area (101–158 m2 g−1), pore volume (0-13–0.29 cc g−1), and smaller particle size (4–10 µm) than those obtained with a conventional sol-gel method (48–129 m2 g−1, 0.14–0.21 cc g−1, 181 µm, respectively). Surprisingly, the catalysts obtained with ultrasound had a content of brookite that was at least 28%, while the traditional sol-gel samples only had 7%. The samples synthesized with ultrasound had a wider distribution of the band-gaps, in the 1.6–1.91 eV range, while traditional ones ranged from 1.72 eV to 1.8 eV. We tested activity in the sonophotocatalytic degradation of two model pollutants (amoxicillin and acetaminophen). The catalysts synthesized with ultrasound were up to 50% more active than the traditional samples.
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Vidya Lekshmi K, Yesodharan S, Yesodharan E. MnO 2 efficiently removes indigo carmine dyes from polluted water. Heliyon 2018; 4:e00897. [PMID: 30450434 PMCID: PMC6226570 DOI: 10.1016/j.heliyon.2018.e00897] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 10/08/2018] [Accepted: 10/25/2018] [Indexed: 11/24/2022] Open
Abstract
MnO2 is identified as a highly efficient sonocatalyst and sonophotocatalyst for the complete removal of even very small concentration of Indigo carmine (IC) dye pollutant from water. The effect of various reaction parameters, viz. dosage of the catalyst, concentration of pollutant, volume of reaction system, pH, dissolved gases, presence of anions/salts and oxidants etc. on the rate of degradation is evaluated and optimum parameters are identified. The degradation follows variable kinetics depending on the concentration of the substrate. The rate of degradation is facilitated by acidic pH. Classic oxidants H2O2 and S2O8 2- behave differently, with the former inhibiting and the latter enhancing the degradation. The effect of anions/salts on the degradation is complex and ranges from 'inhibition' (PO4 3-, CO3 2-, HCO3 -) and 'no effect' (SO4 2-, Cl-) to 'enhancement' (NO3 -, CH3COO-). The high affinity of MnO2 for O2 and its extremely efficient adsorption of H2O2 and the substrate play key roles in the efficiency of the process. Participation of lattice oxygen from MnO2 in the reaction, whenever the dissolved or adsorbed oxygen is deficient, is an important highlight of the process. Major transient intermediates formed during the process are identified by LC-MS. Combination of sonocatalysis with UV photolysis (sonophotocatalysis) enhances the efficiency of degradation and mineralization of IC.
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Affiliation(s)
| | | | - E.P. Yesodharan
- School of Environmental Studies, Cochin University of Science and Technology, Kochi 682022, India
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Qiu P, Park B, Choi J, Thokchom B, Pandit AB, Khim J. A review on heterogeneous sonocatalyst for treatment of organic pollutants in aqueous phase based on catalytic mechanism. ULTRASONICS SONOCHEMISTRY 2018; 45:29-49. [PMID: 29705323 DOI: 10.1016/j.ultsonch.2018.03.003] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 03/03/2018] [Accepted: 03/03/2018] [Indexed: 05/25/2023]
Abstract
Heterogeneous sonocatalysis, as an emerging advanced oxidation process (AOP), has shown immense potential in water treatment and been widely demonstrated to remove persistent organic compounds in the past decade. The present article aims to provide a comprehensive review on the development of a heterogeneous catalyst for enhancing the ultrasonic degradation rate of organic pollutants from a viewpoint of sonocatalytic mechanism. The rational design and fundamentals for preparing sonocatalysts are presented in the context of facilitating the heterogeneous nucleation and photo-thermal-catalytic effects as well as considering the mechanical stability and separation capacity of the heterogeneous catalyst. In addition, some new trends, ongoing challenges and possible methods to overcome these challenges are also highlighted and proposed.
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Affiliation(s)
- Pengpeng Qiu
- School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-701, Republic of Korea
| | - Beomguk Park
- School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-701, Republic of Korea
| | - Jongbok Choi
- School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-701, Republic of Korea
| | - Binota Thokchom
- Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Aniruddha B Pandit
- Department of Chemical Engineering, Institute of Chemical Technology, Mumbai 40019, India
| | - Jeehyeong Khim
- School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-701, Republic of Korea.
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Abstract
Mn-modified diatomite was prepared by wet impregnation and subsequent calcinations processes. It was used as catalyst for sonocatalytic degradation of antibiotics tetracycline. Characterizations by scanning electron microscopy and X-ray diffraction pattern showed that the morphology and crystal structure of the modified diatomite were similar to these of raw diatomite. Despite containing very limited amount of Mn oxides, the Mn-modified diatomite showed much higher sonocatalytic activity than the raw diatomite. The increases in both MnSO4 concentration of the wet impregnation solution and the catalyst dosage could enhance the degradation of antibiotics tetracycline significantly. Kapp values for ultrasonication, catalyst adsorption, and both processes combined (0.10 mol/L MnSO4-modified diatomite) were 1.22 × 10−4, 0.00193, and 0.00453 min−1, respectively, while the corresponding values of R2 were 0.956, 0.986, and 0.953, respectively. These results demonstrated the significant synergetic effect by combining ultrasonication and catalyst adsorption processes. The presence of isopropanol, KBr, and NaN3 quenched a series of reactive oxygen species sharply, indicating the dominant role of reactive oxygen species in the sonocatalytic process. In contrast, the addition of Fe(II) enhanced the degradation due to the generation of more OH∙ radicals in the concurrent Fenton reaction. All the results indicated that Mn-modified diatomite had the great potential for water treatment by sonocatalytic oxidation.
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Huang Y, Zhang H, Wei C, Li G, Wu Q, Wang J, Song Y. Assisted sonocatalytic degradation of pethidine hydrochloride (dolantin) with some inorganic oxidants caused by CdS-coated ZrO2 composite. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2016.08.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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He LL, Liu XP, Wang YX, Wang ZX, Yang YJ, Gao YP, Liu B, Wang X. Sonochemical degradation of methyl orange in the presence of Bi2WO6: Effect of operating parameters and the generated reactive oxygen species. ULTRASONICS SONOCHEMISTRY 2016; 33:90-98. [PMID: 27245960 DOI: 10.1016/j.ultsonch.2016.04.028] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Revised: 04/12/2016] [Accepted: 04/24/2016] [Indexed: 06/05/2023]
Abstract
The Bi2WO6 was prepared by the hydrothermal method and its sonocatalytic activity was studied in the degradation of methyl orange (MO) solutions. The effects of catalytic activity of Bi2WO6 on dye were inspected by the change in absorbance of dye with UV-vis spectrometer. The influences of operational parameters such as the addition amount of Bi2WO6, pH, the initial concentration of dyes, ultrasonic power and irradiation time on the degradation ratio were investigated. In addition, the obtained results indicated that the kinetics of sonochemical reactions of MO were consistent with the pseudo first-order kinetics and Bi2WO6 had excellent reusability and stability during the sonochemical degradation processes. The generation and kinds of reactive oxygen species (ROS) and their influence on the sonochemical degradation of MO were determined by the methods of oxidation-extraction spectrophotometry and ROS scavengers. The results indicate that the degradation of MO in the presence of Bi2WO6 under ultrasonic irradiation is related to the generation of ROS, in which both singlet molecular oxygen ((1)O2) and hydroxyl radical (OH) play important roles in the sonochemical degradation of MO. These experimental results provide a sound foundation for the further development of Bi2WO6 as a sonocatalyst in wastewater treatment.
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Affiliation(s)
- Ling-Ling He
- College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Xian-Ping Liu
- College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Yong-Xia Wang
- College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Zhi-Xin Wang
- College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Yan-Jie Yang
- College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Yan-Ping Gao
- College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Bin Liu
- College of Pharmacy, Liaoning University, Shenyang 110036, China.
| | - Xin Wang
- College of Pharmacy, Liaoning University, Shenyang 110036, China.
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Karaca M, Kıranşan M, Karaca S, Khataee A, Karimi A. Sonocatalytic removal of naproxen by synthesized zinc oxide nanoparticles on montmorillonite. ULTRASONICS SONOCHEMISTRY 2016; 31:250-256. [PMID: 26964947 DOI: 10.1016/j.ultsonch.2016.01.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 01/07/2016] [Accepted: 01/07/2016] [Indexed: 06/05/2023]
Abstract
ZnO/MMT nanocomposite as sonocatalyst was prepared by immobilizing synthesized ZnO on the montmorillonite surface. The characteristics of as-prepared nanocomposite were studied by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) and X-ray diffraction (XRD) techniques. The synthesized samples were used as a catalyst for sonocatalytic degradation of naproxen. ZnO/MMT catalyst in the presence of ultrasound irradiation was more effective compared to pure ZnO nanoparticles and MMT particles in the sonocatalysis of naproxen. The effect of different operational parameters on the sonocatalytic degradation of naproxen including initial drug concentration, sonocatalyst dosage, solution pH, ultrasonic power and the presence of organic and inorganic scavengers were evaluated. It was found that the presence of the scavengers suppressed the sonocatalytic degradation efficiency. The reusability of the nanocomposite was examined in several consecutive runs, and the degradation efficiency decreased only 2% after 5 repeated runs. The main intermediates of naproxen degradation were determined by gas chromatography-mass spectrometry (GC-Mass).
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Affiliation(s)
- Melike Karaca
- Department of Chemistry, Faculty of Science, Atatürk University, 25240 Erzurum, Turkey
| | - Murat Kıranşan
- Department of Chemistry, Faculty of Science, Atatürk University, 25240 Erzurum, Turkey.
| | - Semra Karaca
- Department of Chemistry, Faculty of Science, Atatürk University, 25240 Erzurum, Turkey
| | - Alireza Khataee
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran.
| | - Atefeh Karimi
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran
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Wu TY, Guo N, Teh CY, Hay JXW. Applications of Ultrasound Technology in Environmental Remediation. SPRINGERBRIEFS IN MOLECULAR SCIENCE 2013. [DOI: 10.1007/978-94-007-5533-8_3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Alwash AH, Abdullah AZ, Ismail N. Zeolite Y encapsulated with Fe-TiO2 for ultrasound-assisted degradation of amaranth dye in water. JOURNAL OF HAZARDOUS MATERIALS 2012; 233-234:184-193. [PMID: 22831996 DOI: 10.1016/j.jhazmat.2012.07.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2012] [Revised: 07/01/2012] [Accepted: 07/04/2012] [Indexed: 06/01/2023]
Abstract
A new heterogeneous catalyst for sonocatalytic degradation of amaranth dye in water was synthesized by introducing titania into the pores of zeolite (NaY) through ion exchange method while Fe (III) was immobilized on the encapsulated titanium via impregnation method. XRD results could not detect any peaks for titanium oxide or Fe(2)O(3) due to its low loading. The UV-vis analysis proved a blue shift toward shorter wavelength after the loading of Ti into NaY while a red shift was detected after the loading of Fe into the encapsulated titanium. Different reaction variables such as TiO(2) content, amount of Fe, pH values, amount of hydrogen peroxide, catalyst loading and the initial dye concentration were studied to estimate their effect on the decolorization efficiency of amaranth. The maximum decolorization efficiency achieved was 97.5% at a solution pH of 2.5, catalyst dosage of 2 g/L, 20 mmol/100 mL of H(2)O(2) and initial dye concentration of 10 mg/L. The new heterogeneous catalyst Fe/Ti-NaY was a promising catalyst for this reaction and showed minimum Fe leaching at the end of the reaction.
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Affiliation(s)
- Atheel Hassan Alwash
- School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal, 14300 Penang, Malaysia
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