David Elena
National Research Institute for Cryogenic & Isotopic Technologies, Street Uzinei no. 4, P.O. Râureni, P.O. Box 7, 240050 Râmnicu Vâlcea, Romania.
Materials (Basel). 2022 Dec 31;16(1):389. doi: 10.3390/ma16010389.
Volatile organic compounds (VOCs) released in air represent a major potential for environmental pollution. Capture methods based on activated biochar have attracted attention because of their low cost and for the high removal capacity of the material due to its physical and chemical properties. In this paper, activated biochars were developed and their adsorption performance for VOC capture was evaluated. In the first step, biochars derived from rapeseed cake (RSC) and walnut shells (WSC) were obtained through a carbonization process and then were activated using basic/acid agents (KOH/HSO) to increase their performance as adsorbents. Acetone and toluene were used as the VOC templates. The adsorption capacities of toluene and acetone for non-activated biochars were reduced (26.65 mg/g), while that of activated biochars increased quite significantly, up to 166.72 mg/g, and the biochars activated with HSO presented a higher adsorption capacity of VOCs than the biochars activated with KOH. The higher adsorption capacity of biochars activated with HSO can be attributed to their large surface area, and also to their larger pore volume. This activated biochar adsorbent could be used with good results to equip air purification filters to capture and remove VOCs.
空气中释放的挥发性有机化合物（VOCs）是环境污染的一个主要潜在因素。基于活性生物炭的捕获方法因其成本低且材料因其物理和化学性质具有高去除能力而受到关注。本文制备了活性生物炭，并评估了它们对VOC捕获的吸附性能。第一步，通过碳化过程获得源自菜籽饼（RSC）和核桃壳（WSC）的生物炭，然后使用碱性/酸性试剂（KOH/HSO）对其进行活化，以提高它们作为吸附剂的性能。使用丙酮和甲苯作为VOC模板。甲苯和丙酮对未活化生物炭的吸附容量降低（26.65 mg/g），而活性生物炭的吸附容量显著增加，高达166.72 mg/g，并且用HSO活化的生物炭对VOCs的吸附容量高于用KOH活化的生物炭。用HSO活化的生物炭具有较高的吸附容量可归因于其较大的表面积以及较大的孔体积。这种活性生物炭吸附剂可用于配备空气净化过滤器以捕获和去除VOCs，并取得良好效果。
