Zhang Xinying, Wang Fei, Li Nan, Zhao Dehua, Xu Tao, Wang Yirui, Wei Anlei
Xi'an Key Laboratory of Environmental Simulation and Ecological Health in the Yellow River Basin, College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China.
Shaanxi Key Laboratory of Environmental Monitoring and Forewarning of Trace Pollutants, Shaanxi Environmental Monitoring Center, Xi'an 710054, China.
J Contam Hydrol. 2025 Sep;274:104647. doi: 10.1016/j.jconhyd.2025.104647. Epub 2025 Jun 11.
The effective removal of sulfadiazine (SDZ), an emerging and persistent aquatic contaminant, remains a significant environmental challenge. In this study, a novel sodium alginate-biochar-graphene oxide composite (SA-BC-GO) was synthesized via crosslinking for efficient SDZ adsorption removal in aqueous environments. Characterization revealed a hierarchically porous architecture with a 2.6-fold increase in specific surface area compared to pristine SA, along with reinforced pore walls and enhanced mechanical stability. Batch adsorption experiments demonstrated a Langmuir maximum capacity of 51.91 mg/g at 308 K and 97.3 % SDZ removal efficiency within 7 h. Adsorption kinetics adhered to the pseudo-second-order model, while thermodynamic analysis indicated spontaneous and endothermic characteristics. Fixed-bed column studies further confirmed practical feasibility, achieving 98.7 % SDZ removal efficiency, with Thomas-model-described breakthrough behavior. Mechanistic investigations via XPS and FTIR analyses revealed that SDZ adsorption was governed by multiple interactions, including electrostatic attraction, π-π electron interaction, hydrogen bonding, and hydrophobic partitioning. Notably, SA-BC-GO retained 77.7 % of its adsorption capacity after five regeneration cycles, underscoring remarkable reusability. These findings established SA-BC-GO as a robust, reusable adsorbent, providing mechanistic insights and scalable potential for SDZ and other sulfonamide contaminants in aquatic environments.
有效去除磺胺嘧啶（SDZ）这一新型持久性水生污染物仍然是一项重大的环境挑战。在本研究中，通过交联合成了一种新型海藻酸钠-生物炭-氧化石墨烯复合材料（SA-BC-GO），用于在水环境中高效吸附去除SDZ。表征显示其具有分级多孔结构，比原始SA的比表面积增加了2.6倍，同时孔壁得到增强，机械稳定性提高。批量吸附实验表明，在308K时，Langmuir最大吸附量为51.91mg/g，7小时内SDZ去除效率达到97.3%。吸附动力学符合准二级模型，而热力学分析表明其具有自发和吸热特性。固定床柱研究进一步证实了实际可行性，实现了98.7%的SDZ去除效率，其穿透行为符合Thomas模型描述。通过XPS和FTIR分析进行的机理研究表明，SDZ的吸附受多种相互作用控制，包括静电吸引、π-π电子相互作用、氢键和疏水分配。值得注意的是，SA-BC-GO在五个再生循环后仍保留其77.7%的吸附容量，突出了其显著的可重复使用性。这些发现确立了SA-BC-GO作为一种强大的、可重复使用的吸附剂，为水环境中的SDZ和其他磺胺类污染物提供了机理见解和可扩展潜力。
