Despite proposed alternative fuels in the recent past, the race for a natural substitute still exists. In this research work, we suggest biodiesel preparation from the rarely explored macroalgae using a supercritical fluid system of ethanol/ THF. Reduced graphene oxide was prepared using dried jasmine powder as bio-reductant. Reduced graphene oxide was sulphonated using sulfanilic acid, and the catalysts were characterized by XRD, BET surface area, FTIR, and SEM techniques. The reaction conditions for algal oil conversion into biodiesel in supercritical ethanolysis were optimized. FTIR, and GCMS were eployed as analytical tools to analyze the produced biodiesel. The optimized reaction conditions were 265 °C, ethanol: algal oil= 15:1, Reaction time = 10 min, catalyst loading = 5% GO, and THF: ethanol −0.4 for 78% FAEE yield using GO. 10 wt% S-rGO yielded a maximum of 89% FAEE; and 22.55% C18:2. The catalyst was efficient till five cycles. The work assures the utility of abundant macroalgae for alternative fuel production.

中文翻译：

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超临界条件下磺化还原氧化石墨烯催化大型藻类网萁生产脂肪酸甲酯


尽管最近提出了替代燃料，但对天然替代燃料的争夺仍然存在。在这项研究工作中，我们建议使用乙醇/四氢呋喃的超临界流体系统从很少探索的大型藻类中制备生物柴油。使用干燥茉莉花粉作为生物还原剂制备还原氧化石墨烯。使用对氨基苯磺酸对还原的氧化石墨烯进行磺化，并通过 XRD、BET 表面积、FTIR 和 SEM 技术对催化剂进行表征。对超临界乙醇分解藻油转化为生物柴油的反应条件进行了优化。采用 FTIR 和 GCMS 作为分析工具来分析所生产的生物柴油。优化的反应条件为265℃，乙醇：藻油= 15：1，反应时间= 10分钟，催化剂负载量= 5％GO，THF：乙醇-0.4，使用GO时FAEE产率为78％。 10wt% S-rGO 产生的 FAEE 最高为 89%；和 22.55% C18:2。该催化剂在五个循环之前都是有效的。这项工作确保了丰富的大型藻类可用于替代燃料生产。