Wolski Robert, Bazan-Wozniak Aleksandra, Pietrzak Robert
Department of Applied Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland.
Molecules. 2023 Sep 20;28(18):6712. doi: 10.3390/molecules28186712.
In this study, biocarbon was obtained from the waste material corn digest. Carbon adsorbents were obtained by physical activation of the precursor with CO. Detailed physicochemical characterization of the biocarbon was carried out using low-temperature nitrogen adsorption/desorption, Boehm titration, zero-charge point (pH) and iodine number. In addition, the sorption capacity of the biocarbon agents towards an aqueous solution of methylene blue and methyl red was determined, and the kinetics of the adsorption process were determined. The biocarbon adsorbents were characterized by an average developed specific surface area covering the range from 320 to 616 m/g. The sorption capacity of the biocarbon adsorbents against methylene blue ranged from 40 mg/g to 146 mg/g, and for methyl red it covered the range from 31 mg/g to 113 mg/g. It was shown that the efficiency of organic dye removal by the obtained biocarbons depends on the initial concentration of the adsorbate solution, its mass, shaking rate, adsorbent-adsorbate contact time and temperature. The results obtained from the Langmuir and Freundlich kinetic models showed that the Langmuir model is the most suitable model for describing the adsorption of the studied pollutants on biocarbon. In turn, the adsorption kinetics of dyes is described according to the pseudo-second-order model. Adsorption studies also showed that as the process temperature increases, the removal efficiency of methylene blue and methyl red increases.
在本研究中，生物炭由玉米消化废料制得。通过用CO对前驱体进行物理活化获得碳吸附剂。使用低温氮吸附/脱附、 Boehm滴定、零电荷点（pH）和碘值对生物炭进行了详细的物理化学表征。此外，测定了生物炭剂对亚甲基蓝和甲基红水溶液的吸附容量，并确定了吸附过程的动力学。生物炭吸附剂的平均比表面积发达，范围为320至616 m/g。生物炭吸附剂对亚甲基蓝的吸附容量为40 mg/g至146 mg/g，对甲基红的吸附容量为31 mg/g至113 mg/g。结果表明，所制备的生物炭去除有机染料的效率取决于吸附质溶液的初始浓度、其质量、振荡速率、吸附剂-吸附质接触时间和温度。从Langmuir和Freundlich动力学模型获得的结果表明，Langmuir模型是描述所研究污染物在生物炭上吸附的最合适模型。反过来，染料的吸附动力学根据伪二级模型进行描述。吸附研究还表明，随着过程温度的升高，亚甲基蓝和甲基红的去除效率提高。
