In-situ transesterification of microalgae using carbon-based catalyst under pulsed microwave irradiation
In-situ transesterification of microalgae using carbon-based catalyst under pulsed microwave irradiation
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DOI：
10.1016/j.biombioe.2022.106662
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发表时间：
2023-01
影响因子：
6
通讯作者：
Yik Lam Kam;J. K. C. N. Agutaya;A. Quitain;Y. Ogasawara;M. Sasaki;M. Lam;S. Yusup;S. Assabumrungrat;T. Kida
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文献类型：
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作者：
Yik Lam Kam;J. K. C. N. Agutaya;A. Quitain;Y. Ogasawara;M. Sasaki;M. Lam;S. Yusup;S. Assabumrungrat;T. Kida
在生物燃料的生产中，微藻代表了一种新兴的可再生原料，它可以解决与使用传统的陆基木质纤维素生物质相关的问题。微藻的高脂含量使其成为生产生物柴油主要成分脂肪酸甲酯（FAME）的理想原料。在微波照射下，利用氧化石墨烯（GO）原位进行了普通小球藻脂质与甲醇的酯交换反应。从红外光谱测量和滴定实验中，氧化石墨烯被证明具有氧官能团，可以作为酯交换反应的催化剂。此外，在FAME产率方面，氧化石墨烯的催化性能优于传统的金属基催化剂。另一方面，通过利用甲醇优异的微波吸收率和氧化石墨烯表面的局部加热，发现微波辐射比传统方法提供了更有效的加热。此外，以脉冲方式辐照微波比以连续方式辐照更具有成本效益。有人提出，在短时间间隔内引入的高能量通过更有效地破坏藻类细胞壁，促进了更多脂质的释放。最后，使用甲醇回流操作允许微波辐照系统在甲醇沸点（Tb= 64.7°C）下运行，同时提供比在160°C无回流操作更高的FAME产率。本研究展示了在微波照射下氧化石墨烯作为一种绿色、碳基和可持续的催化剂，用于微藻生产生物柴油。
In the production of biofuels, microalgae represent an emerging class of renewable feedstock that can address the problems associated with the use of the traditional land-based lignocellulosic biomass. The high lipid content of microalgae makes them ideal in producing fatty acid methyl esters (FAME), the main components of biodiesel. In this study, the transesterification of the lipids inChlorella vulgariswith methanol was performedin-situusing graphene oxide (GO) under microwave irradiation. From FTIR measurements and titration experiments, GO was shown to possess oxygen functional groups that can serve as catalysts in transesterification. Moreover, the catalytic performance of GO in terms of FAME yield was found to be better than conventional metal-based catalysts. Microwave irradiation, on the other hand, was found to offer a more efficient heating than conventional methods by taking advantage of the excellent microwave absorptivity of methanol and the local heating induced on the surface of GO. Furthermore, irradiation of microwave in pulses rather than in a continuous mode was shown to be more cost-effective. It is proposed that the high energy introduced into the biomass at short time intervals facilitated the release of more lipids by more effectively disrupting the algal cell wall. Lastly, operating with a methanol reflux allowed the microwave-irradiated system to be operated at the boiling point of methanol (Tb= 64.7 °C) while providing a higher FAME yield than an operation at 160 °C without reflux. This study presents graphene oxide under microwave irradiation as a green, carbon-based, and sustainable catalyst in the production of biodiesel from microalgae.