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Ouyang Y, Li M, Tang C, Song S, Wang H, Huang C, Zhong H, Zhu J, Ji X, Xu H, Chen Z, Liu Z. Low-coordinated Mn-N 2 sites in graphene oxide induce peroxydisulfate activation for tetracycline degradation: Process optimization and theoretical calculation. ENVIRONMENTAL RESEARCH 2024; 260:119621. [PMID: 39019142 DOI: 10.1016/j.envres.2024.119621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 07/06/2024] [Accepted: 07/13/2024] [Indexed: 07/19/2024]
Abstract
Atom-dispersed low-coordinated transition metal-Nx catalysts exhibit excellent efficiency in activating peroxydisulfate (PDS) for environmental remediation. However, their catalytic performance is limited due to metal-N coordination number and single-atom loading amount. In this study, low-coordinated nitrogen-doped graphene oxide (GO) confined single-atom Mn catalyst (Mn-SA/NGO) was synthesized by molten salt-assisted pyrolysis and coupled to PDS for degradation of tetracycline (TC) in water. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM) and X-ray absorption fine structure spectroscopy (XAFS) analysis showed the successful doping of single-atom Mn (weight percentage 1.6%) onto GO and the formation of low-coordinated Mn-N2 sites. The optimized parameters obtained by Box-Behnken Design achieved 100% TC removal in both prediction and experimental results. The Mn-SA/NGO + PDS system had strong anti-interference ability for TC removal in the presence of anions. Besides, Mn-SA/NGO possessed good reusability and stability. O2•-, •OH, and 1O2 were the main active species for TC degradation, and the TC mineralization reached 85.1%. Density functional theory (DFT) calculations confirmed that the introduction of single atoms Mn could effectively enhance adsorption and activation of PDS. The findings provide a reference for the synthesis of high-performance single-atom catalysts for effective removal of antibiotics.
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Affiliation(s)
- Yuan Ouyang
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China
| | - Meifang Li
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China.
| | - Chunfang Tang
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China.
| | - Shiyu Song
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China
| | - Hui Wang
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China
| | - Chenxi Huang
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China
| | - Haoxiang Zhong
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China
| | - Jian Zhu
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China
| | - Xiaodong Ji
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China
| | - Hao Xu
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China
| | - Zhangkai Chen
- College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China
| | - Zhiming Liu
- Department of Biology, Eastern New Mexico University, Portales, NM 88130, USA
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Wang Y, Zhang G, Zhao M, Qi H, Gao T, An L, Sun J. Temperature-dependent excitonic emission characteristics of highly crystallized carbon nitride nanosheets. NANOTECHNOLOGY 2024; 35:305702. [PMID: 38604151 DOI: 10.1088/1361-6528/ad3d63] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Accepted: 04/11/2024] [Indexed: 04/13/2024]
Abstract
Highly-crystallized carbon nitride (HCCN) nanosheets exhibit significant potential for advancements in the field of photoelectric conversion. However, to fully exploit their potential, a thorough understanding of the fundamental excitonic photophysical processes is crucial. Here, the temperature-dependent excitonic photoluminescence (PL) of HCCN nanosheets and amorphous polymeric carbon nitride (PCN) is investigated using steady-state and time-resolved PL spectroscopy. The exciton binding energy of HCCN is determined to be 109.26 meV, lower than that of PCN (207.39 meV), which is attributed to the ordered stacking structure of HCCN with a weaker Coulomb interaction between electrons and holes. As the temperature increases, a noticeable reduction in PL lifetime is observed on both the HCCN and PCN, which is ascribed to the thermal activation of carrier trapping by the enhanced electron-phonon coupling effect. The thermal activation energy of HCCN is determined to be 102.9 meV, close to the value of PCN, due to their same band structures. Through wavelength-dependent PL dynamics analysis, we have identified the PL emission of HCCN as deriving from the transitions:σ*-LP,π*-π, andπ*-LP, where theπ*-LP transition dominants the emission because of the high excited state density of the LP state. These results demonstrate the impact of high-crystallinity on the excitonic emission of HCCN materials, thereby expanding their potential applications in the field of photoelectric conversion.
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Affiliation(s)
- Yue Wang
- College of Physical Science and Technology, Heilongjiang University, Harbin 150080, People's Republic of China
| | - Guodi Zhang
- College of Physical Science and Technology, Heilongjiang University, Harbin 150080, People's Republic of China
| | - Min Zhao
- College of Physical Science and Technology, Heilongjiang University, Harbin 150080, People's Republic of China
| | - Hongbo Qi
- College of Physical Science and Technology, Heilongjiang University, Harbin 150080, People's Republic of China
| | - Tianqi Gao
- College of Physical Science and Technology, Heilongjiang University, Harbin 150080, People's Republic of China
| | - Limin An
- College of Physical Science and Technology, Heilongjiang University, Harbin 150080, People's Republic of China
| | - Jianhui Sun
- College of Physical Science and Technology, Heilongjiang University, Harbin 150080, People's Republic of China
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Li R, Kamali AR. Molten salt assisted conversion of corn lignocellulosic waste into carbon nanostructures with enhanced Li-ion storage performance. Chem Eng Sci 2023. [DOI: 10.1016/j.ces.2022.118222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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S D, Tayade RJ. Low temperature energy- efficient synthesis methods for bismuth-based nanostructured photocatalysts for environmental remediation application: A review. CHEMOSPHERE 2022; 304:135300. [PMID: 35691396 DOI: 10.1016/j.chemosphere.2022.135300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 05/27/2022] [Accepted: 06/08/2022] [Indexed: 06/15/2023]
Abstract
Bismuth-based composite materials have unique structural, chemical, optical, and electrical properties that are highly beneficial in Photocatalysis. The layered structure and tunable bandgap properties of the Bismuth-based composites are advantageous for the absorption of solar light efficiently. Also, these properties help the separation and recombination of photogenerated charge carriers, leading to enhancement in the photocatalytic activity. Synthesis of the catalyst at a lower temperature to produce catalyst reduces the production cost and electrical energy consumption. This review provides an overview of the recent development in Bismuth-based composite nanostructured photocatalytic materials, mainly using low-temperature driven synthesis methods. Herein, we have mainly summarized the primarily used low temperature-based synthetic routes, particularly in the temperature range of 50-300 °C for synthesizing Bismuth-based composite materials. In addition to this, the photocatalytic mechanism, the textural, structural, electronic, and photocatalytic properties of the synthesized photocatalysts are discussed. The literature shows that the surface area of the composite Bismuth-based photocatalytic materials synthesized using the low-temperature synthetic route is in the range of 1.5-81 m2/g and can be activated by solar, ultraviolet, and Light Emitting Diode (LEDs) light irradiation based on the synthetic route. Their photocatalytic performance and structural stability are excellent and utilized for several runs. The comprehensive understanding of the low-temperature synthesis of Bismuth-based composite materials for visible light-activated photocatalytic applications provided will be useful for developing photocatalytic materials on an industrial scale due to energy-efficient synthetic routes. Furthermore, the prospects of low temperature-driven Bismuth-based composite synthesis routes are discussed.
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Affiliation(s)
- Devika S
- Inorganic Materials & Catalysis Division, CSIR-Central Salt and Marine Chemicals Research Institute, G.B. Marg, Bhavnagar, Gujarat, 364002, India
| | - Rajesh J Tayade
- Inorganic Materials & Catalysis Division, CSIR-Central Salt and Marine Chemicals Research Institute, G.B. Marg, Bhavnagar, Gujarat, 364002, India.
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Liu D, Yang L, Wu J, Li B. Molten salt synthesis of WS 2 and MoS 2 nanosheets toward efficient gaseous elemental mercury capture. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 824:153934. [PMID: 35182641 DOI: 10.1016/j.scitotenv.2022.153934] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 01/24/2022] [Accepted: 02/12/2022] [Indexed: 06/14/2023]
Abstract
The development of high-efficient adsorbents for Hg0 capture in a broad temperature window remains a big challenge. Transition-metal dichalcogenides (TMDs) present great prospects owing to their two-dimensional layered structures and abundant active sulfur species. Here, tungsten disulfide (WS2) and molybdenum disulfide (MoS2) nanosheets are easily synthesized via a molten salt route and employed for Hg0 sequestration. With the elevation of the annealing temperature, the Hg0 capture ability of WS2 nanosheet gradually enhances, while MoS2 nanosheet first increases and then decreases. They both display good mercury removal performances in an enlarged temperature range of 60-260 °C. Acidic flue gas components (i.e., SO2 and NO) subtly interfere the mercury removal process, indicating the prospective application potentials of WS2 and MoS2 nanosheets in thermal plants.
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Affiliation(s)
- Dongjing Liu
- School of Energy and Power Engineering, Jiangsu University, 212013 Zhenjiang, China
| | - Lingtao Yang
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, 200090 Shanghai, China
| | - Jiang Wu
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, 200090 Shanghai, China.
| | - Bin Li
- School of Energy and Power Engineering, Jiangsu University, 212013 Zhenjiang, China.
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Jiang Y, Fu T, Liu J, Zhao J, Li B, Chen Z. Molten salt synthesis of carbon-supported Pt–rare earth metal nanoalloy catalysts for oxygen reduction reaction. RSC Adv 2022; 12:4805-4812. [PMID: 35425521 PMCID: PMC8981501 DOI: 10.1039/d1ra09400a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 01/26/2022] [Indexed: 11/21/2022] Open
Abstract
The synthesis mechanism of Pt–RE nanoalloy particles prepared by one-step molten salt synthesis as an advanced ORR catalyst is proposed.
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Affiliation(s)
- Yulin Jiang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Centre of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, Engineering Research Center of Electrochemical Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Tao Fu
- College of Chemistry and Material Science, Fujian Provincial Key Laboratory of Clean Energy Materials, Longyan University, Longyan 364012, People's Republic of China
| | - Jiaxiang Liu
- College of Energy, Xiamen University, Xiamen 361005, People's Republic of China
| | - Jinbao Zhao
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Centre of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, Engineering Research Center of Electrochemical Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
- College of Energy, Xiamen University, Xiamen 361005, People's Republic of China
| | - Bing Li
- College of Chemistry and Material Science, Fujian Provincial Key Laboratory of Clean Energy Materials, Longyan University, Longyan 364012, People's Republic of China
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Zhenjie Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Centre of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, Engineering Research Center of Electrochemical Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
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