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Xia S, Tao J, Zhao Y, Men Y, Chen C, Hu Y, Zhu G, Chu Y, Yan B, Chen G. Application of waste derived magnetic acid-base bifunctional CoFe/biochar/CaO as an efficient catalyst for biodiesel production from waste cooking oil. CHEMOSPHERE 2024; 350:141104. [PMID: 38171400 DOI: 10.1016/j.chemosphere.2023.141104] [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: 10/19/2023] [Revised: 12/17/2023] [Accepted: 12/31/2023] [Indexed: 01/05/2024]
Abstract
The loss of active components, weak acid resistance, and low recover efficiency of common Ca-based catalysts limited its further development and application. In this study, to effectively produce biodiesel from waste cooking oil (WCO), a green and recyclable magnetic acid-base bifunctional CoFe/biochar/CaO catalyst was prepared from sargassum and river snail shell waste via hydrothermal method. The catalysts' structure and properties were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), CO2/NH3 temperature programmed desorption (CO2/NH3 TPD), etc., The prepared catalyst mainly consisted of the carbon skeleton, CoFe alloy, and CaO. CoFe alloy provided catalyst's ferromagnetism for magnetic separation as well as acid sites for transesterification of WCO. Ca and other metal species with nanoscale (∼5.64 nm) were dispersively anchored on sargassum biochar surface, thereby leading to good catalytic activity (99.21% biodiesel yield) and stability (91.70% biodiesel yield after the 5th cycle). In addition, response surface methodology-Box-Behnken design (RSM-BBD) revealed the optimal operational conditions were 16:1 methanol/oil molar ratio, 3 wt% catalyst dosage, 73 °C for 157 min. The maximum biodiesel yield predicted value was 98.29% and the experimental value was 99.21%, indicating good satisfaction of the established model. Moreover, the quality of WCO biodiesel met the ASTM D6751 standards. This study benefits magnetic waste-derived acid-base bifunctional catalysts for the disposal of WCO towards sustainable biodiesel production.
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Affiliation(s)
- Shaige Xia
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China
| | - Junyu Tao
- Interdisciplinary Innovation Lab for Environment & Energy/School of Mechanical Engineering, Tianjin University of Commerce, Tianjin, 300134, China.
| | - Yihua Zhao
- Tianjin Eco-City Water Investment and Construction Ltd, China.
| | - Yanhui Men
- Qingdao Spring Water-treatment Co., Ltd., China
| | - Chao Chen
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China
| | - Yongjie Hu
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China
| | - Guangbin Zhu
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China
| | - Yiwei Chu
- Tianjin Eco-City Water Investment and Construction Ltd, China
| | - Beibei Yan
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China
| | - Guanyi Chen
- Qingdao Spring Water-treatment Co., Ltd., China
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Hong Q, Zhao L, Lin F, Tan N, You X, Lu B, Huang B, Lv J, Chen Y, Tang L. Synthesis of Guanine/Vermiculite Two-Dimensional Nanocomposites for Wireless Humidity Sensing in Nut Storage Environment. ACS APPLIED MATERIALS & INTERFACES 2023; 15:58734-58745. [PMID: 38055937 DOI: 10.1021/acsami.3c13235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Two-dimensional (2D) nanostructures have the advantages of high specific surface area, easy surface functionalization, abundant active sites, and good compatibility with device integration and can be assembled into three-dimensional structures, which are key to the development of high-performance gas sensors. In this study, 2D vermiculite (VMT) nanosheets and guanine (G), two renewable resources with unique chemical structures, were organically combined to fully use the specificity of their molecular structures and functional activities. Driven by the regulation of 2D VMT nanosheets, guanine/vermiculite (G/VMT)-based 2D nanocomposites with controllable pore structure, multiple binding sites, and unobstructed mass transfer were designed and synthesized. The G/VMT nanocomposite material was used as a quartz crystal microbalance (QCM) electrode-sensitive film material to build a QCM-based humidity sensor. G/VMT-based QCM humidity sensor had good logarithmic linear relation (0.9971), high sensitivity (24.49 Hz/% relative humidity), low hysteresis (1.75% RH), fast response/recovery time (39/6 s), and good stability. Furthermore, with a QCM sensor and a specially designed wireless circuit, a wireless humidity detection system transmitting via Wi-Fi allows real-time monitoring of nut storage. This study presents an environmentally friendly, high-performance, miniature 2D nanocomposite sensor strategy for real-time monitoring.
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Affiliation(s)
- Qiqi Hong
- College of Material Engineering, Fujian Agriculture and Forestry University, Fujian 350108, China
| | - Lan Zhao
- College of Material Engineering, Fujian Agriculture and Forestry University, Fujian 350108, China
| | - Fengcai Lin
- Fujian Engineering and Research Center of New Chinese Lacquer Materials, College of Materials and Chemical Engineering, Minjiang University, Fujian 350108, China
| | - Ningning Tan
- College of Material Engineering, Fujian Agriculture and Forestry University, Fujian 350108, China
| | - Xinda You
- College of Material Engineering, Fujian Agriculture and Forestry University, Fujian 350108, China
| | - Beili Lu
- College of Material Engineering, Fujian Agriculture and Forestry University, Fujian 350108, China
| | - Biao Huang
- College of Material Engineering, Fujian Agriculture and Forestry University, Fujian 350108, China
| | - Jianhua Lv
- College of Material Engineering, Fujian Agriculture and Forestry University, Fujian 350108, China
| | - Yandan Chen
- College of Material Engineering, Fujian Agriculture and Forestry University, Fujian 350108, China
| | - Lirong Tang
- College of Material Engineering, Fujian Agriculture and Forestry University, Fujian 350108, China
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Unruean P, Nomura K, Kitiyanan B. High Conversion of CaO-Catalyzed Transesterification of Vegetable Oils with Ethanol. J Oleo Sci 2022; 71:1051-1062. [PMID: 35691836 DOI: 10.5650/jos.ess21374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Fatty acid ethyl esters (FAEEs) derived from vegetable oils and ethanol are promising bio-based chemicals for various applications such as biofuel, monomers for polyesters, and fine chemicals. However, the limited conversion and yield are obtained in the conventional methods due to low boiling point of ethanol that thus requires conducting the reaction at low temperature. This work demonstrates high yield of FAEEs from soybean, rice bran and palm oil with ethanol by performing the transesterification at high temperatures of 150-200°C by using CaO catalyst in a high pressure reactor. The results demonstrate the complete reaction for all vegetable oils with low ethanol to oil molar ratio of 6:1 and 1 wt.% CaO catalyst. Higher reaction temperature results in faster reaction while keeping high conversion of ≥ 99.0%. The unsaturated components in FAEE products are consistent with their original fatty acid chain. Moreover, the high conversion can be achieved even in the reaction conducted with low ethanol to oil molar ratio of 4.5:1 and 0.5 wt.% CaO catalyst at 180 °C in the palm oil transesterification. The catalyst can be reused for at least 3 times with the conversion higher than 94.0%. In addition, the activation energy (Ea), enthalpy of activation (ΔH‡), entropy of activation (ΔS‡) and Gibbs free energy of activation (ΔG‡) are also obtained.
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Affiliation(s)
- Palawat Unruean
- The Petroleum and Petrochemical College, Chulalongkorn University
| | - Kotohiro Nomura
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University
| | - Boonyarach Kitiyanan
- The Petroleum and Petrochemical College, Chulalongkorn University.,Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University
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Ji B, Zhang W. Rare earth elements (REEs) recovery and porous silica preparation from kaolinite. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2021.06.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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