Modesto Helen R, Lemos Sherlan G, Dos Santos Mikaela S, Komatsu Jenny S, Gonçalves Maraísa, Carvalho Wagner A, Carrilho Elma N V M, Labuto Geórgia
Department of Chemistry, Universidade Federal de São Paulo, Diadema, SP, 09913-030, Brazil.
Department of Chemistry, Universidade Federal da Paraíba, Joao Pessoa, PB, 58051-970, Brazil.
Environ Sci Pollut Res Int. 2021 May;28(19):24694-24705. doi: 10.1007/s11356-020-10458-z. Epub 2020 Aug 15.
This work aims to obtain activated carbon (AC) from yeast residue to boost up bioeconomy. In this way, carbon was prepared from yeast biomass produced by the ethanol industry and after beta-glucan extraction. Carbon was activated with CO, water vapor, and a combination of both using an experimental design. The best conditions to produce AC were activation with CO for 30 min at 850 °C and CO flow of 0.09 L/min, set by experimental design and desirability function to optimize the yield, surface area, and microporosity. Thus, for physical activation with water vapor employing the optimized conditions, it was possible to achieve a yield of 56.6% (m/m) for AC with 1144 m/g of surface area and mean micropore volume of 0.53 cm/g. The maximum AC surface area reached 1616 ± 567 m/g with a yield of 21 ± 1%. The prepared ACs were characterized by elemental analysis, X-ray diffractometry, infrared spectroscopy, thermogravimetry analysis, pH, and potentiometric titration to determine the main functional groups of sorption sites. The carbon obtained from the desirability condition was used to remove dipyrone from synthetic aqueous effluent with an experimental sorption capacity of 88 ± 4 mg/g, being the phenomenon described by the Freundlich isotherm model.
这项工作旨在从酵母残渣中获取活性炭（AC），以推动生物经济发展。通过这种方式，由乙醇工业生产的酵母生物质在提取β-葡聚糖后制备碳。使用实验设计，用一氧化碳、水蒸气以及两者的组合对碳进行活化。通过实验设计和期望函数确定生产活性炭的最佳条件为：在850℃下用一氧化碳活化30分钟，一氧化碳流速为0.09L/min，以优化产率、表面积和微孔率。因此，对于采用优化条件的水蒸气物理活化，有可能获得产率为56.6%（质量/质量）的活性炭，其表面积为1144m²/g，平均微孔体积为0.53cm³/g。活性炭的最大表面积达到1616±567m²/g，产率为21±1%。通过元素分析、X射线衍射、红外光谱、热重分析、pH值和电位滴定对制备的活性炭进行表征，以确定吸附位点的主要官能团。从期望条件获得的碳用于从合成水性废水中去除安乃近，实验吸附容量为88±4mg/g，该现象由弗伦德利希等温线模型描述。
