Deng Liping, Gu Shichun, Wang Ruyi, He Yapeng, Dong Hairong, Wang Xue
Yunnan Key Laboratory of Modern Separation Analysis and Substance Transformation, College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, China.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Nanomaterials (Basel). 2025 Jan 17;15(2):136. doi: 10.3390/nano15020136.
We successfully synthesize monodisperse sulfhydryl-modified mesoporous organosilica nanospheres (MONs-SH) via one-step hydrolytic condensation, where cetyltrimethylammonium chloride and dodecyl sulfobetaine are employed as dual-template agents with (3-mercaptopropyl)triethoxysilane and 1,2-bis(triethoxysilyl)ethane as the precursors and concentrated ammonia as the alkaline catalyst. The prepared MONs-SHs deliver a large specific surface area (729.15 m g), excellent monodispersity, and homogeneous particle size. The introduction of ethanol into the reaction systems could expand the particle size of the synthesized MONs-SH materials from 18 to 182 nm. Moreover, the successful modification of -SH groups endowed MONs-SHs with an excellent adsorption capacity (297.12 mg g) for Pb ions in aqueous solution through ion exchange and complexation function. In addition, the established isotherm model and kinetic analyses reveal that the adsorption of Pb ions on MONs-SHs follows the secondary reaction kinetic models, where both physisorption and chemisorption contribute to the adsorption of Pb ions. The favorable recyclability of MONs-SHs is demonstrated with the maintained adsorption efficiency of 85.35% after six cycles. The results suggest that the synthesized MONs-SHs exhibit considerable application prospects for effectively eliminating Pb ions from aqueous solutions.
我们通过一步水解缩合成功合成了单分散巯基修饰的介孔有机硅纳米球（MONs-SH），其中十六烷基三甲基氯化铵和十二烷基磺基甜菜碱用作双模板剂，（3-巯基丙基）三乙氧基硅烷和1,2-双（三乙氧基硅基）乙烷作为前驱体，浓氨水作为碱性催化剂。制备的MONs-SH具有大的比表面积（729.15 m²/g）、优异的单分散性和均匀的粒径。将乙醇引入反应体系可使合成的MONs-SH材料的粒径从18 nm扩大到182 nm。此外，-SH基团的成功修饰使MONs-SH通过离子交换和络合作用对水溶液中的Pb离子具有优异的吸附容量（297.12 mg/g）。此外，建立的等温线模型和动力学分析表明，Pb离子在MONs-SH上的吸附遵循二级反应动力学模型，其中物理吸附和化学吸附都对Pb离子的吸附有贡献。MONs-SH具有良好的可回收性，六个循环后吸附效率保持在85.35%。结果表明，合成的MONs-SH在有效去除水溶液中的Pb离子方面具有可观的应用前景。
