1
|
Sidaraite R, Baltakys K, Jaskunas A, Naslenas N, Slavinskas D, Slavinskas E, Dambrauskas T. Kinetic Study and Catalytic Activity of Cr 3+ Catalyst Supported on Calcium Silicate Hydrates for VOC Oxidation. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3489. [PMID: 39063781 PMCID: PMC11278306 DOI: 10.3390/ma17143489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2024] [Revised: 06/24/2024] [Accepted: 07/03/2024] [Indexed: 07/28/2024]
Abstract
Volatile organic compounds (VOCs) are pollutants that pose significant health and environmental risks, necessitating effective mitigation strategies. Catalytic oxidation emerges as a viable method for converting VOCs into non-toxic end products. This study focuses on synthesizing a catalyst based on calcium silicate hydrates with chromium ions in the CaO-SiO2-Cr(NO3)3-H2O system under hydrothermal conditions and evaluating its thermal stability and catalytic performance. A catalyst with varying concentrations of chromium ions (10, 25, 50, 100 mg/g Cr3+) was synthesized in unstirred suspensions under saturated steam pressure at a temperature of 220 °C. Isothermal curing durations were 8 h, 16 h, and 48 h. Results of X-ray diffraction and atomic absorption spectroscopy showed that hydrothermal synthesis is effective for incorporating up to 100 mg/g Cr3+ into calcium silicate hydrates. The catalyst with Cr3+ ions (50 mg/g) remained stable up to 550 °C, beyond which chromatite was formed. Catalytic oxidation experiments with propanol and propyl acetate revealed that the Cr3+ catalyst supported on calcium silicate hydrates enhances oxygen exchange during the heterogeneous oxidation process. Kinetic calculations indicated that the synthesized catalyst is active, with an activation energy lower than 65 kJ/mol. This study highlights the potential of Cr3+-intercalated calcium silicate hydrates as efficient catalysts for VOC oxidation.
Collapse
Affiliation(s)
- Ramune Sidaraite
- Department of Silicate Technology, Kaunas University of Technology, Radvilenu 19, LT-50270 Kaunas, Lithuania; (R.S.); (T.D.)
| | - Kestutis Baltakys
- Department of Silicate Technology, Kaunas University of Technology, Radvilenu 19, LT-50270 Kaunas, Lithuania; (R.S.); (T.D.)
| | - Andrius Jaskunas
- Department of Physical and Inorganic Chemistry, Kaunas University of Technology, Radvilenu 19, LT-50270 Kaunas, Lithuania; (A.J.); (N.N.)
| | - Nedas Naslenas
- Department of Physical and Inorganic Chemistry, Kaunas University of Technology, Radvilenu 19, LT-50270 Kaunas, Lithuania; (A.J.); (N.N.)
| | | | - Edvinas Slavinskas
- JSC “Bio-Techno Line”, Juostos 5, Trakiskis, LT-38102 Panevezys, Lithuania
| | - Tadas Dambrauskas
- Department of Silicate Technology, Kaunas University of Technology, Radvilenu 19, LT-50270 Kaunas, Lithuania; (R.S.); (T.D.)
| |
Collapse
|
2
|
Baskaran D, Dhamodharan D, Behera US, Byun HS. A comprehensive review and perspective research in technology integration for the treatment of gaseous volatile organic compounds. ENVIRONMENTAL RESEARCH 2024; 251:118472. [PMID: 38452912 DOI: 10.1016/j.envres.2024.118472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 02/04/2024] [Accepted: 02/10/2024] [Indexed: 03/09/2024]
Abstract
Volatile organic compounds (VOCs) are harmful pollutants emitted from industrial processes. They pose a risk to human health and ecosystems, even at low concentrations. Controlling VOCs is crucial for good air quality. This review aims to provide a comprehensive understanding of the various methods used for controlling VOC abatement. The advancement of mono-functional treatment techniques, including recovery such as absorption, adsorption, condensation, and membrane separation, and destruction-based methods such as natural degradation methods, advanced oxidation processes, and reduction methods were discussed. Among these methods, advanced oxidation processes are considered the most effective for removing toxic VOCs, despite some drawbacks such as costly chemicals, rigorous reaction conditions, and the formation of secondary chemicals. Standalone technologies are generally not sufficient and do not perform satisfactorily for the removal of hazardous air pollutants due to the generation of innocuous end products. However, every integration technique complements superiority and overcomes the challenges of standalone technologies. For instance, by using catalytic oxidation, catalytic ozonation, non-thermal plasma, and photocatalysis pretreatments, the amount of bioaerosols released from the bioreactor can be significantly reduced, leading to effective conversion rates for non-polar compounds, and opening new perspectives towards promising techniques with countless benefits. Interestingly, the three-stage processes have shown efficient decomposition performance for polar VOCs, excellent recoverability for nonpolar VOCs, and promising potential applications in atmospheric purification. Furthermore, the review also reports on the evolution of mathematical and artificial neural network modeling for VOC removal performance. The article critically analyzes the synergistic effects and advantages of integration. The authors hope that this article will be helpful in deciding on the appropriate strategy for controlling interested VOCs.
Collapse
Affiliation(s)
- Divya Baskaran
- Department of Chemical and Biomolecular Engineering, Chonnam National University, Yeosu, Jeonnam 59626, South Korea; Department of Biomaterials, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Chennai-600077, India
| | - Duraisami Dhamodharan
- Interdisciplinary Research Centre for Refining and Advanced Chemicals, King Fahd, University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Uma Sankar Behera
- Department of Chemical and Biomolecular Engineering, Chonnam National University, Yeosu, Jeonnam 59626, South Korea
| | - Hun-Soo Byun
- Department of Chemical and Biomolecular Engineering, Chonnam National University, Yeosu, Jeonnam 59626, South Korea.
| |
Collapse
|
3
|
Granados-Fernández R, Montiel MA, Arias AN, Fernández-Marchante CM, Lobato J, Rodrigo MA. Improving treatment of VOCs by integration of absorption columns into electrochemical cells using 3-D printing technology. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
|
4
|
Fu R, Zhang PS, Jiang YX, Sun L, Sun XH. Wastewater treatment by anodic oxidation in electrochemical advanced oxidation process: Advance in mechanism, direct and indirect oxidation detection methods. CHEMOSPHERE 2023; 311:136993. [PMID: 36309052 DOI: 10.1016/j.chemosphere.2022.136993] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 10/19/2022] [Accepted: 10/21/2022] [Indexed: 06/16/2023]
Abstract
Electrochemical Advanced Oxidation Process (EAOP) has been applied to the degradation of refractory pollutants in wastewater due to its strong oxidation capacity, high degradation efficiency, simple operation, and mild reaction. Among electrochemical processes, anodic oxidation (AO) is the most widely used and its mechanism is mainly divided into direct oxidation and indirect oxidation. Direct oxidation means that pollutants are oxidized at the anode by direct electron transfer. Indirect oxidation refers to the generation of active species during the electrolytic reaction, which acts on pollutants. The mechanism of AO process is controlled by many factors, including electrode type, electrocatalyst material, wastewater composition, pH, applied current and voltage levels. It is very important to explore the reaction mechanism of electrochemical treatment, which determines the efficiency of the reaction, the products of the reaction, and the extent of reaction. This paper firstly reviews the current research progress on the mechanism of AO process, and summarizes in detail the different mechanisms caused by influencing factors under common AO process. Then, strategies and methods to distinguish direct oxidation and indirect oxidation mechanisms are reviewed, such as intermediate product analysis, electrochemical test analysis, active species detection, theoretical calculation, and the limitations of these methods are analyzed. Finally some suggestions are put forward for the study of the mechanism of electrochemical advanced oxidation.
Collapse
Affiliation(s)
- Rui Fu
- School of Chemical Engineering, Northeast Electric Power University, 132012, Jilin, PR China.
| | - Peng-Shuang Zhang
- School of Chemical Engineering, Northeast Electric Power University, 132012, Jilin, PR China.
| | - Yuan-Xing Jiang
- School of Chemical Engineering, Northeast Electric Power University, 132012, Jilin, PR China.
| | - Lin Sun
- College of Chemistry, Jilin University, ChangChun, 130012, Jilin, PR China.
| | - Xu-Hui Sun
- School of Chemical Engineering, Northeast Electric Power University, 132012, Jilin, PR China.
| |
Collapse
|
5
|
Arias AN, Granados-Fernández R, Fernández-Marchante C, Lobato J, Rodrigo MA. Influence of current density and inlet gas flow in the treatment of gaseous streams polluted with benzene by electro-absorption. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140610] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
6
|
Wu J, Ding B, Qian X, Mao L, Zheng H, Zhang L, Zheng S, Zhang J. Nanosheets loaded on tetrahedral surfaces form a Z-type Bi 2MoO 6/γ-Bi 2O 3 heterojunction to enhance the photocatalytic degradation activity of lomefloxacin and Rhodamine B. Dalton Trans 2022; 51:15797-15805. [DOI: 10.1039/d2dt02687b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanosheets loading on tetrahedral surfaces of a Bi2MoO6/γ-Bi2O3 heterojunction forming a Z-type energy band to enhance the photocatalytic degradation activity.
Collapse
Affiliation(s)
- Jiawei Wu
- Key Laboratory of Brain-like Neuromorphic Devices and Systems of Hebei Province, College of Electron and Information Engineering, Hebei University, Baoding 071002, China
| | - Bangfu Ding
- Key Laboratory of Brain-like Neuromorphic Devices and Systems of Hebei Province, College of Electron and Information Engineering, Hebei University, Baoding 071002, China
| | - Xin Qian
- College of Physics Science and Technology, Hebei University, Baoding 071002, China
| | - Liang Mao
- School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China
| | - Huibin Zheng
- School of Mathematics and Physics, Anyang Institute of Technology, Anyang 455099, China
| | - Lei Zhang
- Key Laboratory of Brain-like Neuromorphic Devices and Systems of Hebei Province, College of Electron and Information Engineering, Hebei University, Baoding 071002, China
| | - Shukai Zheng
- Key Laboratory of Brain-like Neuromorphic Devices and Systems of Hebei Province, College of Electron and Information Engineering, Hebei University, Baoding 071002, China
| | - Junying Zhang
- School of Physics, Beihang University, Beijing 100191, China
| |
Collapse
|