Liu Tianhao, Baek Da Rae, Kim Jae Seok, Joo Sang-Woo, Lim Jong Kuk
Department of Chemistry, College of Natural Science, Chosun University, Gwangju 61452, South Korea.
Department of Chemistry, College of Natural Sciences, Soongsil University, Seoul 06978, South Korea.
ACS Omega. 2020 Jun 23;5(26):16246-16254. doi: 10.1021/acsomega.0c02066. eCollection 2020 Jul 7.
With an increase in biodiesel demand, a large surplus of glycerol is expected, and there is interest regarding the usage of glycerol as a value-added product. One such idea is to use glycerol as a "green solvent" to replace petroleum-based organic solvents. Glycerol is nontoxic to humans, and its vapor pressure is sufficiently high for the chemical reaction to be performed at high temperatures under ambient atmospheric pressures. Its dielectric constant is between those of water and organic solvents, and it dissolves widely varying materials, spanning between salts and organic molecules. Metal nanoparticles have been known to be synthesized in glycerol within limited experimental conditions, including high temperatures, alkaline pH conditions, and the irradiance of ultraviolet light. Herein, we report that silver nanoparticles have been formed in glycerol under completely green conditions (e.g., room temperature, neutral pH conditions, and without irradiance of ultraviolet light). We suggest that aldehydes and free radicals are generated in glycerol, which is operating as reducing species.
随着生物柴油需求的增加，预计会有大量甘油过剩，人们对将甘油用作增值产品的用途很感兴趣。其中一个想法是使用甘油作为“绿色溶剂”来替代石油基有机溶剂。甘油对人体无毒，其蒸气压足够高，能够在环境大气压下的高温下进行化学反应。它的介电常数介于水和有机溶剂之间，能溶解范围广泛的物质，包括盐类和有机分子。已知在有限的实验条件下，如高温、碱性pH条件和紫外线照射下，可以在甘油中合成金属纳米颗粒。在此，我们报告在完全绿色的条件下（例如室温、中性pH条件且无紫外线照射），已在甘油中形成了银纳米颗粒。我们认为在甘油中会产生醛类和自由基，它们作为还原物质发挥作用。
