Zeghioud Hicham, Fryda Lydia, Mahieu Angélique, Visser Rian, Kane Abdoulaye
UniLaSalle-Ecole des Métiers de l'Environnement, Cyclann, Campus de Ker Lann, 35170 Bruz, France.
Department of Energy Transition, Dutch Institute of Applied Research TNO, Westerduinweg 3, 1755 LE Petten, The Netherlands.
Materials (Basel). 2022 Apr 12;15(8):2824. doi: 10.3390/ma15082824.
Flax shives and beech wood residues represent biomass streams that are abundant in Northwest Europe. These primary feedstocks were evaluated for their suitability to produce biochar as a low environmental-impact adsorbent. The efficacy of the produced biochars was tested by their adsorption capacity towards methylene blue (MB). A series of adsorption tests with carbamazepine is also presented, focusing on the better performing beech wood biochar. Post treatment of the biochars with citric acid (CA) and oxidation of the surface by heating at 250 °C in a muffle oven were carried out to enhance the adsorption capacities of both flax shives biochar (FSBC) and beech biochar (BBC). The resulting physicochemical characteristics are described. The thermally treated biochars have specific surface areas of 388 m·g and 272 m·g compared to the untreated biochars with 368 and 142 m·g for BBC and FSBC, respectively. CA treatment leads to enhancement of the oxygenated surface functional groups and the adsorption capacities of both studied biochars. The non-linear Langmuir and Freundlich models show the best fit for both the isotherm data for MB and the CMZ adsorption with a good correlation between the experimental and calculated adsorption capacities. The effect of adsorbent dosages and initial concentrations of MB and CMZ on the adsorption efficiency is discussed. It can be concluded that beech biochar is a very promising pollutant adsorbent only requiring a mild, low-cost, and low-environmental impact activation treatment for best performance.
亚麻屑和山毛榉木残渣是西北欧丰富的生物质流。对这些主要原料作为低环境影响吸附剂生产生物炭的适用性进行了评估。通过所制备生物炭对亚甲基蓝（MB）的吸附容量来测试其功效。还进行了一系列关于卡马西平的吸附试验，重点是性能较好的山毛榉木生物炭。对生物炭进行柠檬酸（CA）后处理，并在马弗炉中于250℃加热进行表面氧化，以提高亚麻屑生物炭（FSBC）和山毛榉生物炭（BBC）的吸附容量。描述了所得的物理化学特性。与未处理的生物炭相比，热处理后的生物炭比表面积分别为388 m²/g和272 m²/g，而未处理的BBC和FSBC的比表面积分别为368和142 m²/g。CA处理导致两种研究生物炭的含氧表面官能团和吸附容量增强。非线性朗缪尔和弗伦德利希模型对MB和CMZ吸附的等温线数据拟合效果最佳，实验吸附容量与计算吸附容量之间具有良好的相关性。讨论了吸附剂用量以及MB和CMZ初始浓度对吸附效率的影响。可以得出结论，山毛榉生物炭是一种非常有前途的污染物吸附剂，只需进行温和、低成本且低环境影响的活化处理就能达到最佳性能。
