Mokrzycki Jakub, Franus Wojciech, Panek Rafał, Sobczyk Maciej, Rusiniak Piotr, Szerement Justyna, Jarosz Renata, Marcińska-Mazur Lidia, Bajda Tomasz, Mierzwa-Hersztek Monika
Department of Coal Chemistry and Environmental Sciences, Faculty of Energy and Fuels, AGH University of Science and Technology, Mickiewicza 30 Av., 30-059 Cracow, Poland.
Department of Construction Materials Engineering and Geoengineering, Civil Engineering and Architecture Faculty, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland.
Materials (Basel). 2023 Mar 7;16(6):2142. doi: 10.3390/ma16062142.
Waste fly ash, with both low (with the addition of vermiculite) and high contents of unburned coal, were subjected to hydrothermal syntheses aiming to obtain zeolite composite materials-zeolite + vermiculite (NaX-Ver) and zeolite + unburned carbon (NaX-C). The composites were compared with parent zeolite obtained from waste fly ash with a low content of unburned carbon (NaX-FA). In this study, the physicochemical characteristics of the obtained materials were evaluated. The potential application of the investigated zeolites for the adsorption of ammonium ions from aqueous solutions was determined. Composite NaX-Ver and parent zeolite NaX-FA were characterized by comparable adsorption capacities toward ammonium ions of 38.46 and 40.00 mg (NH) g, respectively. The nearly 2-fold lower adsorption capacity of composite NaX-C (21.05 mg (NH) g) was probably a result of the lower availability of ion exchange sites within the material. Adsorbents were also regenerated using 1 M NaCl solution at a pH of 10 and subjected to 3 cycles of adsorption-desorption experiments, which proved only a small reduction in adsorption properties. This study follows the current trend of waste utilization (fly ash) and the removal of pollutants from aqueous solutions with respect to their reuse, which remains in line with the goals of the circular economy.
废弃粉煤灰，其未燃尽煤含量有低（添加蛭石时）有高，被用于水热合成，旨在获得沸石复合材料——沸石+蛭石（NaX-Ver）和沸石+未燃尽碳（NaX-C）。将这些复合材料与由未燃尽碳含量低的废弃粉煤灰制得的母体沸石（NaX-FA）进行比较。在本研究中，对所得材料的物理化学特性进行了评估。测定了所研究的沸石对水溶液中铵离子的吸附潜在应用。复合NaX-Ver和母体沸石NaX-FA对铵离子的吸附容量相当，分别为38.46和40.00 mg（NH）/g。复合NaX-C的吸附容量（21.05 mg（NH）/g）几乎低2倍，这可能是由于材料中离子交换位点的可用性较低。吸附剂还用pH为10的1 M NaCl溶液进行了再生，并进行了3个吸附-解吸实验循环，结果表明吸附性能仅略有降低。本研究遵循了当前废弃（粉煤灰）利用以及从水溶液中去除污染物以实现再利用的趋势，这与循环经济的目标一致。
