l-Cysteine-modified dendritic fibrous nanosilica grafted by amine groups (Cys-DFNS-NH₂) have been synthesized by a novel hydrothermal method. The N2 adsorption–desorption isotherms analysis on the Cys-DFNS-NH₂ show that the average pore volume and surface area of the prepared fibrous Cys-DFNS-NH₂ were 2.2 cm³/g and 205 m²/g, respectively, while the average pore size is 6.06 nm. Adsorption behavior of the Cys-DFNS-NH₂ for Cd²⁺, Cu²⁺, Ag⁺, and Pb²⁺ was investigated by electrochemical methods. The results show that Cys-DFNS-NH₂ can selectively adsorb Cd²⁺, Ag⁺, and Pb²⁺ in different potentials. Finally, the application of the engineered adsorbent for the removal of Cd²⁺, Ag⁺, and Pb²⁺ from contaminated water samples was examined. This work provides a new platform to the synthesis of Cys-DFNS-NH₂ with high specific surface area for efficient adsorbent of specific metal ions.

通过新型水热法合成了由胺基（Cys-DFNS-NH ₂）接枝的1-半胱氨酸改性的树枝状纤维纳米二氧化硅。在Cys-DFNS-NH ₂上进行的N2吸附-解吸等温线分析表明，所制备的Cys-DFNS-NH ₂纤维的平均孔体积和表面积分别为2.2 cm ³ / g和205 m ² / g，而平均孔径为6.06 nm。通过电化学方法研究了Cys-DFNS-NH ₂对Cd ₂ ⁺，Cu 2 ⁺，Ag ⁺和Pb ^2+的吸附行为。结果表明，Cys-DFNS-NH ₂能以不同的电位选择性吸附Cd 2 ⁺，Ag ⁺和Pb ²⁺。最后，研究了工程吸附剂在从污染水样中去除Cd 2 ⁺，Ag ⁺和Pb ^2+的应用。这项工作为合成具有高比表面积的Cys-DFNS-NH ₂提供了一个新的平台，以有效吸附特定金属离子。