Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5B, 02-106, Warsaw, Poland.
The College of Inter-Faculty Individual Studies in Mathematics and Natural Sciences (MISMaP), University of Warsaw, Banacha 2C, 02-097, Warsaw, Poland.
Environ Sci Pollut Res Int. 2023 May;30(22):62689-62703. doi: 10.1007/s11356-023-26425-3. Epub 2023 Mar 22.
In this paper, green nanocomposites based on biomass and superparamagnetic nanoparticles were synthesized and used as adsorbents to remove methylene blue (MB) from water with magnetic separation. The adsorbents were synthesized through the wet co-precipitation technique, in which iron-oxide nanoparticles coated the cores based on coffee, cellulose, and red volcanic algae waste. The procedure resulted in materials that could be easily separated from aqueous solutions with magnets. The morphology and chemical composition of the nanocomposites were characterized by SEM, FT-IR, and XPS methods. The adsorption studies of MB removal with UV-vis spectrometry showed that the adsorption performance of the prepared materials strongly depended on their morphology and the type of the organic adsorbent. The adsorption studies presented the highest effectiveness in neutral pH with only a slight effect on ionic strength. The MB removal undergoes pseudo-second kinetics for all adsorbents. The maximal adsorption capacity for the coffee@FeO-2, cellulose@FeO-1, and algae@FeO-1 is 38.23 mg g, 41.61 mg g, and 48.41 mg g, respectively. The mechanism of MB adsorption follows the Langmuir model using coffee@FeO and cellulose@FeO, while for algae@FeO the process fits to the Redlich-Peterson model. The removal efficiency analysis based on UV-vis adsorption spectra revealed that the adsorption effectiveness of the nanocomposites increased as follows: coffee@FeO-2 > cellulose@FeO-1 > algae@FeO-1, demonstrating an MB removal efficiency of up to 90%.
在本文中，我们合成了基于生物质和超顺磁性纳米粒子的绿色纳米复合材料，并将其用作吸附剂，通过磁分离从水中去除亚甲基蓝（MB）。通过湿共沉淀技术合成了吸附剂，其中氧化铁纳米粒子涂覆了以咖啡、纤维素和红色火山藻类废物为核的核。该方法得到的材料可以很容易地用磁铁从水溶液中分离出来。通过 SEM、FT-IR 和 XPS 方法对纳米复合材料的形貌和化学组成进行了表征。通过紫外可见光谱法研究了 MB 的吸附去除，结果表明，所制备材料的吸附性能强烈依赖于其形态和有机吸附剂的类型。吸附研究表明，在中性 pH 下，所有吸附剂对 MB 的去除效果最佳，对离子强度的影响很小。MB 的去除遵循所有吸附剂的伪二级动力学。咖啡@FeO-2、纤维素@FeO-1 和藻类@FeO-1 的最大吸附容量分别为 38.23、41.61 和 48.41 mg g。MB 吸附的机理遵循咖啡@FeO 和纤维素@FeO 的 Langmuir 模型，而对于藻类@FeO，该过程符合 Redlich-Peterson 模型。基于紫外可见吸收光谱的去除效率分析表明，纳米复合材料的吸附效率如下：咖啡@FeO-2>纤维素@FeO-1>藻类@FeO-1，表明 MB 的去除效率高达 90%。
