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Li Q, Chang Y, Xie F, Wang W. Intensification of sonochemical degradation of methylene blue by adding carbon tetrachloride. ARAB J CHEM 2021. [DOI: 10.1016/j.arabjc.2021.103311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Su J, Chen H, Wang J, Yang Q. Enhanced dechlorination of carbon tetrachloride by Ni-doped zero-valent iron nanoparticles @ magnetic Fe3O4 (Ni4/Fe@Fe3O4) nanocomposites. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126691] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Sajjadi B, Asgharzadehahmadi S, Asaithambi P, Raman AAA, Parthasarathy R. Investigation of mass transfer intensification under power ultrasound irradiation using 3D computational simulation: A comparative analysis. ULTRASONICS SONOCHEMISTRY 2017; 34:504-518. [PMID: 27773275 DOI: 10.1016/j.ultsonch.2016.06.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 05/24/2016] [Accepted: 06/20/2016] [Indexed: 06/06/2023]
Abstract
This paper aims at investigating the influence of acoustic streaming induced by low-frequency (24kHz) ultrasound irradiation on mass transfer in a two-phase system. The main objective is to discuss the possible mass transfer improvements under ultrasound irradiation. Three analyses were conducted: i) experimental analysis of mass transfer under ultrasound irradiation; ii) comparative analysis between the results of the ultrasound assisted mass transfer with that obtained from mechanically stirring; and iii) computational analysis of the systems using 3D CFD simulation. In the experimental part, the interactive effects of liquid rheological properties, ultrasound power and superficial gas velocity on mass transfer were investigated in two different sonicators. The results were then compared with that of mechanical stirring. In the computational part, the results were illustrated as a function of acoustic streaming behaviour, fluid flow pattern, gas/liquid volume fraction and turbulence in the two-phase system and finally the mass transfer coefficient was specified. It was found that additional turbulence created by ultrasound played the most important role on intensifying the mass transfer phenomena compared to that in stirred vessel. Furthermore, long residence time which depends on geometrical parameters is another key for mass transfer. The results obtained in the present study would help researchers understand the role of ultrasound as an energy source and acoustic streaming as one of the most important of ultrasound waves on intensifying gas-liquid mass transfer in a two-phase system and can be a breakthrough in the design procedure as no similar studies were found in the existing literature.
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Affiliation(s)
- Baharak Sajjadi
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Seyedali Asgharzadehahmadi
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Perumal Asaithambi
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Abdul Aziz Abdul Raman
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
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Kuppusamy S, Palanisami T, Megharaj M, Venkateswarlu K, Naidu R. Ex-Situ Remediation Technologies for Environmental Pollutants: A Critical Perspective. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2016; 236:117-192. [PMID: 26423074 DOI: 10.1007/978-3-319-20013-2_2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Pollution and the global health impacts from toxic environmental pollutants are presently of great concern. At present, more than 100 million people are at risk from exposure to a plethora of toxic organic and inorganic pollutants. This review is an exploration of the ex-situ technologies for cleaning-up the contaminated soil, groundwater and air emissions, highlighting their principles, advantages, deficiencies and the knowledge gaps. Challenges and strategies for removing different types of contaminants, mainly heavy metals and priority organic pollutants, are also described.
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Affiliation(s)
- Saranya Kuppusamy
- CERAR-Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, SA, 5095, Australia
- CRC CARE-Cooperative Research Centre for Contamination Assessment and Remediation of Environment, 486, Salisbury South, SA, 5106, Australia
| | - Thavamani Palanisami
- CRC CARE-Cooperative Research Centre for Contamination Assessment and Remediation of Environment, 486, Salisbury South, SA, 5106, Australia
- GIER- Global Institute for Environmental Research, Faculty of Science and Information Technology, The University of Newcastle, Callaghan, NSW, 2308, Australia
| | - Mallavarapu Megharaj
- CRC CARE-Cooperative Research Centre for Contamination Assessment and Remediation of Environment, 486, Salisbury South, SA, 5106, Australia.
- GIER- Global Institute for Environmental Research, Faculty of Science and Information Technology, The University of Newcastle, Callaghan, NSW, 2308, Australia.
| | - Kadiyala Venkateswarlu
- Formerly Department of Microbiology, Sri Krishnadevaraya University, Anantapur, 515055, India
| | - Ravi Naidu
- CRC CARE-Cooperative Research Centre for Contamination Assessment and Remediation of Environment, 486, Salisbury South, SA, 5106, Australia
- GIER- Global Institute for Environmental Research, Faculty of Science and Information Technology, The University of Newcastle, Callaghan, NSW, 2308, Australia
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Goswami N, Basu S, Bhowal A, Datta S. Concentration of solution in cross-flow rotating packed bed contactor. Chem Eng Res Des 2015. [DOI: 10.1016/j.cherd.2014.11.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Laugier F, Andriantsiferana C, Wilhelm AM, Delmas H. Ultrasound in gas-liquid systems: effects on solubility and mass transfer. ULTRASONICS SONOCHEMISTRY 2008; 15:965-972. [PMID: 18468473 DOI: 10.1016/j.ultsonch.2008.03.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2006] [Revised: 03/05/2008] [Accepted: 03/06/2008] [Indexed: 05/26/2023]
Abstract
The effect of ultrasound on the pseudo-solubility of nitrogen in water and on gas-liquid mass transfer kinetics has been investigated in an autoclave reactor equipped with a gas induced impeller. In order to use organic liquids and to investigate the effect of pressure, gas-liquid mass transfer coefficient was calculated from the evolution of autoclave pressure during gas absorption to avoid any side-effects of ultrasound on the concentrations measurements. Ultrasound effect on the apparent solubility is very low (below 12%). Conversely ultrasound greatly improves gas-liquid mass transfer, especially below gas induction speed, this improvement being boosted by pressure. In typical conditions of organic synthesis: 323 K, 1100 rpm, 10 bar, k(L).a is multiplied by 11 with ultrasound (20 kHz/62.6 W). The impact of sonication is much higher on gassing out than on gassing in. In the same conditions, this enhancement is at least five times higher for degassing.
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Affiliation(s)
- F Laugier
- Laboratoire de Génie Chimique, 5 rue Paulin Talabot, BP 1301, 31 106 Toulouse, France
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Bejarano-Pérez NJ, Suárez-Herrera MF. Sonochemical and sonophotocatalytic degradation of malachite green: the effect of carbon tetrachloride on reaction rates. ULTRASONICS SONOCHEMISTRY 2008; 15:612-617. [PMID: 17977775 DOI: 10.1016/j.ultsonch.2007.09.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2007] [Revised: 08/12/2007] [Accepted: 09/23/2007] [Indexed: 05/25/2023]
Abstract
A comparative study between the sonolytic, photocatalytic and sonophotocatalytic oxidation processes of aqueous solutions of malachite green was carried out in the presence of carbon tetrachloride, under a low power ultrasonic field (<15 W) and using titanium dioxide as a photocatalyst. The effect of a number of parameters such as ultrasonic intensity, TiO2 crystalline structure and the presence of CCl4 were studied using an inexpensive reactor. Enhanced rates of sonolytic degradation of malachite green in the presence of CCl4 were demonstrated. On the other hand, the simultaneous use of sonolysis and photocatalysis in the presence of CCl4 does not improve the degradation rate of malachite green in comparison with the one obtained using only sonolysis, but it makes possible a faster oxidative degradation of some reaction intermediaries. Finally, in air saturated solutions both processes, the sonolytic and the photocatalytic one, follow a first-order rate law.
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Affiliation(s)
- Néstor Javier Bejarano-Pérez
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Cra 30 # 45-03, Edificio 451, Bogotá, Colombia
| | - Marco Fidel Suárez-Herrera
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Cra 30 # 45-03, Edificio 451, Bogotá, Colombia.
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Chapter 7 Ultrasound-assisted analytical chemical reactions. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/s0167-9244(07)80023-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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