MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Hebei Engineering Research Center for Ecological Restoration of Seaward Rivers and Coastal Waters, Hebei University of Environmental Engineering, Hebei 066102, China.
Bioresour Technol. 2024 Jun;401:130745. doi: 10.1016/j.biortech.2024.130745. Epub 2024 Apr 25.
The interaction mechanisms of silicon (Si) and active ingredient iron (Fe) on cadmium (Cd) removal are still unknown. Herein, the Fe/Si modified biochar (Fe/Si-BC) was synthesized to enhance Cd removal by pre-immersion of Fe and ball milling loading of Si. Detailed characterizations indicated that Fe and Si were successfully introduced into Fe/Si-BC, resulting in the formation of a new metallic silicate (CaFe(SiO)). The maximum Cd adsorption capacity of Fe/Si-BC (31.66 mg g) was 3.6 times and 2.5 times higher than that of Fe-BC (8.89 mg g) and Si-BC (11.03 mg g), respectively, deriving from an enhancement of Si dissolution induced by Fe introduction. The dissolved Si could capture and combine Cd to form CdSiO precipitation, which was strongly supported by the random forest regression and correlation between dissolved Si content and Cd adsorption capacity. This study advances the mechanistic insights into synergistic functions of Si and Fe in Cd removal.
硅 (Si) 和活性成分铁 (Fe) 对镉 (Cd) 去除的相互作用机制尚不清楚。在此，通过 Fe 的预浸渍和 Si 的球磨加载合成了 Fe/Si 改性生物炭 (Fe/Si-BC)，以增强 Cd 的去除。详细的特性表明，Fe 和 Si 成功地引入了 Fe/Si-BC，形成了一种新的金属硅酸盐 (CaFe(SiO))。Fe/Si-BC（31.66mg g）的最大 Cd 吸附容量比 Fe-BC（8.89mg g）和 Si-BC（11.03mg g）分别高 3.6 倍和 2.5 倍，这归因于 Fe 引入导致 Si 溶解的增强。溶解的 Si 可以捕获和结合 Cd 形成 CdSiO 沉淀，这得到了随机森林回归和溶解 Si 含量与 Cd 吸附容量之间相关性的有力支持。本研究深入了解了 Si 和 Fe 在 Cd 去除中的协同作用机制。
