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Thallium separation from wastewater using α-FeOOH@Biochar: Efficacy and mechanism. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Znak Z, Zin O, Mashtaler A, Korniy S, Sukhatskiy Y, Gogate PR, Mnykh R, Thanekar P. Improved modification of clinoptilolite with silver using ultrasonic radiation. ULTRASONICS SONOCHEMISTRY 2021; 73:105496. [PMID: 33636551 PMCID: PMC7906887 DOI: 10.1016/j.ultsonch.2021.105496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 01/17/2021] [Accepted: 02/10/2021] [Indexed: 06/12/2023]
Abstract
The modification of natural clinoptilolite with silver ions using ultrasound has been investigated in the current work. The modification process was performed using clinoptilolite of different fractions (0-3.0 mm) over the temperature range of 25-55 °C, ultrasonic power range of 8.0-12.5 W and AgNO3 concentration range of 0.01-0.1 M. The zeolite modification was performed in the presence of sonication and mechanical stirring in separate runs for comparison. Fundamental analysis demonstrated that the use of ultrasound ensures desorption of air from clinoptilolite particles and accelerates the diffusion of Ag+ ions and subsequent ion exchange. Increasing the particle size of clinoptilolite led to a natural decrease in its sorption capacity. A slight increase in the sorption capacity with an increase in the equivalent particle diameter from 0.081 to 0.35 mm was seen due to changes in the structure of clinoptilolite particles during mechanical grinding. The calculated temperature coefficient of the sorption process of Ag+ ions as <1.47 means that the modification takes place with dominant control in the intradiffusion region. Increasing the power of ultrasonic irradiation did not provide a monotonous change in the sorption capacity of clinoptilolite. Increasing the concentration of argentum nitrate solution provided an increase in the content of silver ions in clinoptilolite. In general, the advantage of using ultrasonic vibrations to modify the natural clinoptilolite of different fractions with Ag+ ions was demonstrated in terms of achieving higher sorption capacity, also elucidating the effect of different operating conditions.
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Affiliation(s)
- Z Znak
- Institute of Chemistry and Chemical Technologies, Lviv Polytechnic National University, Bandera Str., Lviv 79013, Ukraine.
| | - O Zin
- Institute of Chemistry and Chemical Technologies, Lviv Polytechnic National University, Bandera Str., Lviv 79013, Ukraine
| | - A Mashtaler
- Institute of Chemistry and Chemical Technologies, Lviv Polytechnic National University, Bandera Str., Lviv 79013, Ukraine
| | - S Korniy
- Karpenko Physico-Mechanical Institute of the NAS of Ukraine, Naukova Str., Lviv 79060, Ukraine
| | - Yu Sukhatskiy
- Institute of Chemistry and Chemical Technologies, Lviv Polytechnic National University, Bandera Str., Lviv 79013, Ukraine
| | - Parag R Gogate
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai 40019, India.
| | - R Mnykh
- Institute of Chemistry and Chemical Technologies, Lviv Polytechnic National University, Bandera Str., Lviv 79013, Ukraine
| | - Pooja Thanekar
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai 40019, India
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Ultrasound-Assisted Preparation of Mo/ZSM-5 Zeolite Catalyst for Non-Oxidative Methane Dehydroaromatization. Catalysts 2021. [DOI: 10.3390/catal11030313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The activity and selectivity of Mo/ZSM-5, benchmarking catalyst for the non-oxidative dehydroaromatization of methane, strongly depend on the cluster size, spatial distribution, and chemical environment of the Mo-based active sites. This study discloses the use of an ultrasound-assisted ion-exchange (US-IE) technique as an alternative Mo/ZSM-5 synthesis procedure in order to promote metal dispersion along the zeolite framework. For this purpose, a plate transducer (91.8 kHz) is employed to transmit the ultrasonic irradiation (US) into the ion-exchange reactor. The physico-chemical properties and catalytic activity of samples prepared under the said irradiation procedure and traditional impregnation (IWI) method are critically evaluated. Characterization results suggest that US neither affects the crystalline structure nor the particle size of the parent zeolite. However, US-IE promotes molybdenum species dispersion, avoids clustering at the external fresh zeolite surface and enhances molybdate species anchoring to the zeolite framework with respect to IWI. Despite the improved metal dispersion, the catalytic activity between catalysts synthesized by US-IE and IWI is comparable. This suggests that the sole initial dispersion enhancement does not suffice to boost the catalyst productivity and further actions such ZSM-5 support and catalyst pre-conditioning are required. Nevertheless, the successful implementation of US-IE and the resulting metal dispersion enhancement pave the way toward the application of this technique to the synthesis of other dispersed catalysts and materials of interest.
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Woo JM, Seo JY, Kim H, Lee DH, Park YC, Yi CK, Park YS, Moon JH. CuY zeolite catalysts prepared by ultrasonication-assisted ion-exchange for oxidative carbonylation of methanol to dimethyl carbonate. ULTRASONICS SONOCHEMISTRY 2018; 44:146-151. [PMID: 29680597 DOI: 10.1016/j.ultsonch.2018.02.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 02/06/2018] [Accepted: 02/06/2018] [Indexed: 06/08/2023]
Abstract
The influence of ultrasonication treatment on the catalytic performance of CuY zeolite catalysts was investigated for the liquid-phase oxidative carbonylation of methanol to dimethyl carbonate (DMC). The deammoniation method of NH4Y into HY zeolites was optimized and characterized by elemental analyzer, derivative thermogravimetry, Brunauer-Emmett-Teller (BET) analyzer, and powder X-ray diffractometry, revealing that the HY zeolite deammoniated at 400 °C presented the highest surface area, complete ammonium/proton ion exchange, and no structure collapse, rendering it the best support from all the prepared zeolites. CuY zeolites were prepared via aqueous phase ion exchange with the aid of ultrasonication. Upon ultrasonication, the Cu+ active centers were uniformly dispersed in the Y zeolites, penetrating the core of the zeolite particles in a very short time. In addition to enhancing the Cu dispersity, the ultrasonication treatment influenced the BET surface area, acid amount, Cu+/Cu2+ ratio, and also had a relatively small impact on the Cu loading. Consequently, adequate exposure to ultrasonication was able to increase the conversion rate of methanol into dimethyl carbonate up to 11.4% with a comparable DMC selectivity of 23.7%. This methanol conversion is 2.65 times higher than that obtained without the ultrasonication treatment.
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Affiliation(s)
- Je-Min Woo
- Greenhouse Gas Laboratory, Korea Institute of Energy Research (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea; Department of Environmental Engineering, Daejeon University, 62 Daehak-ro, Dong-gu, Daejeon 34520, Republic of Korea
| | - Jung Yoon Seo
- Greenhouse Gas Laboratory, Korea Institute of Energy Research (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
| | - Hyunuk Kim
- Energy Material Laboratory, Korea Institute of Energy Research (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
| | - Dong-Ho Lee
- Greenhouse Gas Laboratory, Korea Institute of Energy Research (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
| | - Young Cheol Park
- Greenhouse Gas Laboratory, Korea Institute of Energy Research (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
| | - Chang-Keun Yi
- Greenhouse Gas Laboratory, Korea Institute of Energy Research (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
| | - Yeong Seong Park
- Department of Environmental Engineering, Daejeon University, 62 Daehak-ro, Dong-gu, Daejeon 34520, Republic of Korea
| | - Jong-Ho Moon
- Greenhouse Gas Laboratory, Korea Institute of Energy Research (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea.
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Pinchukova NA, Voloshko AY, Merko MA, Bondarenko YA, Chebanov VA. Intensification of ion exchange desorption of thiamine diphosphate by low-powered ultrasound. ULTRASONICS SONOCHEMISTRY 2018; 41:261-266. [PMID: 29137750 DOI: 10.1016/j.ultsonch.2017.09.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 09/25/2017] [Accepted: 09/25/2017] [Indexed: 06/07/2023]
Abstract
The process of ultrasound-assisted ion-exchange desorption of cocarboxylase (thiamine diphosphate (TDP)) from a strong acidic cation resin was studied. Kinetics studies revealed that ultrasound accelerates TDP desorption by 3 times. The optimal desorption parameters, viz. US power input, sonication time, eluent/resin ratio and the eluent (ammonium acetate buffer) concentration were established which were 15mW/cm3, 20min, 1:1 and 1M, respectively. The resin stability studies showed that the optimal ultrasonic power was less by the order than the resin degradation threshold which ensures durable and efficient resin exploitation during production. The resin sorption capacity remained unchanged even after 20 cycles of TDP sorption, ultrasonic desorption and resin regeneration. The recovery ratio of TDP was shown to increase non-linearly with decreasing the resin saturation factor, which can be attributed to diffusion limitations occurring during desorption. The optimal resin loading corresponding to more than 90 per cent of TDP recovery was found to be at the level of 10 per cent of the maximal sorption capacity. The study revealed 4-5-fold increase in concentrations of the recovered solutions, which together with process times shortening should result in considerable energy saving in downstream operations on production scale.
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Affiliation(s)
- Natalia A Pinchukova
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave., 60, Kharkiv 61072, Ukraine.
| | - Alexander Y Voloshko
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave., 60, Kharkiv 61072, Ukraine
| | - Maria A Merko
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave., 60, Kharkiv 61072, Ukraine
| | - Yana A Bondarenko
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave., 60, Kharkiv 61072, Ukraine
| | - Valentin A Chebanov
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave., 60, Kharkiv 61072, Ukraine; V.N. Karazin Kharkiv National University, Svobody sq., 4, Kharkiv 61022, Ukraine
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Çakıcıoğlu-Özkan F, Erten-Kaya Y. Enhancement of Cerium exchange with Ultrasound. JOURNAL OF THE TURKISH CHEMICAL SOCIETY, SECTION A: CHEMISTRY 2017. [DOI: 10.18596/jotcsa.370769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Gutiérrez LF, Hamoudi S, Belkacemi K. Production of Lactobionic Acid from its Sodium Salt Solution by Ion-Exchange on a Commercial Strong Acid Resin: Kinetic Data and Modeling. SEP SCI TECHNOL 2015. [DOI: 10.1080/01496395.2015.1014051] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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