Jóźwiak Tomasz, Filipkowska Urszula
Department of Environmental Engineering, University of Warmia and Mazury in Olsztyn, Warszawska St. 117a, 10-957 Olsztyn, Poland.
Molecules. 2024 Feb 14;29(4):843. doi: 10.3390/molecules29040843.
The study investigated the effect of modifying rapeseed husks with ammonia and epichlorohydrin on their sorption capacity against anionic reactive dyes: Reactive Black 5 (RB5) and Reactive Yellow 84 (RY84). Its scope included sorbents characterization (FTIR, pH), determination of pH influence on the sorption effectiveness of dyes, the adsorption kinetics of dyes, as well as the maximum sorption capacity. The study proved that the reaction of rapeseed husk biomass with ammonia can lead to its amination, namely to the introduction of amine functional groups into the material's structure. The sorption effectiveness of RB5 and RY84 on the tested sorbents was the highest in the pH range of 2-3. The dye sorption kinetics was well described by the pseudo-second-order model. The sorption equilibrium time ranged from 90 to 180 min, and depended on the initial concentration of dyes and the number of amino groups on the sorbent's surface. The most efficient of the sorbents tested were rapeseed husks pre-activated with epichlorohydrin and then aminated with ammonia. Their sorption capacity determined for RB5 and RY84 was 135.83 mg/g and 114.23 mg/g, respectively, which was 794% and 737% higher than that of the non-modified husks.
该研究考察了用氨和环氧氯丙烷对油菜籽壳进行改性处理后，其对阴离子活性染料（活性黑5，RB5；活性黄84，RY84）的吸附能力。研究范围包括吸附剂表征（傅里叶变换红外光谱法，pH值）、pH值对染料吸附效果的影响测定、染料的吸附动力学以及最大吸附容量。研究证明，油菜籽壳生物质与氨反应可导致其胺化，即将胺官能团引入材料结构中。RB5和RY84在测试吸附剂上的吸附效果在pH值2 - 3范围内最高。染料吸附动力学可用准二级模型很好地描述。吸附平衡时间为90至180分钟，这取决于染料的初始浓度和吸附剂表面氨基的数量。测试的吸附剂中效率最高的是先用环氧氯丙烷预活化然后用氨胺化的油菜籽壳。它们对RB5和RY84的吸附容量分别为135.83毫克/克和114.23毫克/克，分别比未改性的壳高出794%和737%。
