Simić Marija, Petrović Jelena, Koprivica Marija, Ercegović Marija, Dimitrijević Jelena, Vuković Nikola S, Fiol Núria
Institute for Technology of Nuclear and Other Mineral Raw Materials, 11000 Belgrade, Serbia.
LEPAMAP-PRODIS Research Group, Universitat de Girona, 17004 Girona, Spain.
Toxics. 2025 May 30;13(6):459. doi: 10.3390/toxics13060459.
This study used widely available waste biomass, corn cob (CC), to remove Pb ions from aqueous solutions. A two-step conversion of this material was carried out to improve its adsorption characteristics. Firstly, CC was prepared by hydrothermal carbonization; afterward, the obtained hydrochar was doped by MgCl and pyrolyzed. The synthesized hydro-pyrochar (HCC-Mg) was used for adsorption experiments in a batch system. The surface and structural properties of HCC-Mg were characterized by SEM-EDX and FTIR analysis before and after Pb adsorption. Kinetic and isotherm models were applied to the experimental results. It was confirmed that Pb adsorption on HCC-Mg occurred rapidly, with a maximum adsorption capacity of 87.08 mg/g. The pseudo-second-order model best described the adsorption process, while the best fit of the experimental data was observed with the Sips isotherm model. The results of this study showed that the capacity of the synthesized HCC-Mg material had increased more than 14 times compared with raw CC. In addition, the synthesized material had the potential to be reused for at least five cycles with minimal loss of adsorption capacity and efficiency. Moreover, the results confirmed that HCC-Mg can be used as an efficient, sustainable adsorbent of Pb from polluted water.
本研究使用广泛可得的废弃生物质玉米芯（CC）从水溶液中去除铅离子。对该材料进行了两步转化以改善其吸附特性。首先，通过水热碳化制备CC；之后，将得到的水热炭用MgCl掺杂并热解。合成的水热焦（HCC-Mg）用于间歇系统中的吸附实验。在铅吸附前后，通过扫描电子显微镜-能谱仪（SEM-EDX）和傅里叶变换红外光谱（FTIR）分析对HCC-Mg的表面和结构性质进行了表征。将动力学和等温线模型应用于实验结果。证实了HCC-Mg对铅的吸附迅速发生，最大吸附容量为87.08 mg/g。准二级模型最能描述吸附过程，而实验数据与Sips等温线模型拟合最佳。本研究结果表明，合成的HCC-Mg材料的容量比原始CC增加了14倍以上。此外，合成材料具有至少重复使用五个循环的潜力，吸附容量和效率损失最小。而且，结果证实HCC-Mg可作为一种高效、可持续的吸附剂用于从污染水中去除铅。
