Kazmierczak-Razna Justyna, Zioła-Frankowska Anetta, Nowicki Piotr, Frankowski Marcin, Wolski Robert, Pietrzak Robert
Łukasiewicz Research Network-Institute of Non-Ferrous Metals, Division in Poznań, Central Laboratory of Batteries and Cells, Forteczna 12, 61-362 Poznań, Poland.
Faculty of Chemistry, Adam Mickiewicz University in Poznań, 61-614 Poznań, Poland.
Materials (Basel). 2021 Nov 20;14(22):7045. doi: 10.3390/ma14227045.
This paper deals with the adsorption of heavy metal ions (Cu and Zn) on the carbonaceous materials obtained by chemical activation and ammoxidation of Polish brown coal. The effects of phase contact time, initial metal ion concentration, solution pH, and temperature, as well as the presence of competitive ions in solution, on the adsorption capacity of activated carbons were examined. It has been shown that the sample modified by introduction of nitrogen functional groups into carbon structure exhibits a greater ability to uptake heavy metals than unmodified activated carbon. It has also been found that the adsorption capacity increases with the increasing initial concentration of the solution and the phase contact time. The maximum adsorption was found at pH = 8.0 for Cu(II) and pH = 6.0 for Zn(II). For all samples, better fit to the experimental data was obtained with a Langmuir isotherm than a Freundlich one. A better fit of the kinetic data was achieved using the pseudo-second order model.
本文研究了通过波兰褐煤的化学活化和氨氧化得到的含碳材料对重金属离子（铜和锌）的吸附作用。考察了相接触时间、初始金属离子浓度、溶液pH值、温度以及溶液中竞争离子的存在对活性炭吸附容量的影响。结果表明，通过向碳结构中引入氮官能团改性的样品比未改性的活性炭表现出更强的重金属吸附能力。还发现吸附容量随着溶液初始浓度和相接触时间的增加而增大。对于铜（II），在pH = 8.0时吸附量最大；对于锌（II），在pH = 6.0时吸附量最大。对于所有样品，与Freundlich等温线相比，Langmuir等温线对实验数据的拟合效果更好。使用准二级模型能更好地拟合动力学数据。
