红壤-羟基磷灰石体系中镉化学行为研究
Study on the chemical behavior of cadmium in red soil and hydroxyapatite system
摘要
Abstract
Effect of hydroxyapatite on the chemical behavior of cadmium in red soil was researched,using a multi-layer interface transport device,and the cadmium migration mechanism in the hydroxyapatite red soil system was identified through isothermal adsorption model and site energy distribution model.The results show that alkaline-active substances in hydroxyapatite are rapidly released,and the pH value of red soil significantly increased when the distance is less than 2 mm from the hydroxyapatite barrier layer for 7 d.The mass percentage of exchangeable cadmium decreases significantly,mainly transforming into iron manganese oxide bound cadmium.With the extension of experimental time,the system returns to equilibrium,and the pH of red soil decreases and tends to stabilize.At the same time,a small amount of stable/metastable cadmium transforms into exchangeable cadmium.However,the pH of red soil is delayed in rising when the distance from the hydroxyapatite interlayer is greater than 5 mm,and the mass percentage of exchangeable cadmium slowly decreases with the extension of experimental time.The trend of increase in site energy on the interface is consistent with the trend of site energy change during the adsorption of Cd2+by hydroxyapatite.Moreover,the adsorption intensity of cadmium at the red soil-hydroxyapatite interface increases with prolonged equilibrium time,but the magnitude of increase diminishes,which is attributed to Cd migration from low-energy to high-energy adsorption sites in the passivation system.关键词
镉/羟基磷灰石/红壤/钝化技术/迁移机制Key words
cadmium/hydroxyapatite/red soil/passivation technology/migration mechanism分类
资源环境引用本文复制引用
李晓晖,孙小艳,王玺洋,李亮,辛在军,何石福,刘丽贞,李娅,艾仙斌..红壤-羟基磷灰石体系中镉化学行为研究[J].中南大学学报（自然科学版）,2025,56(9):3649-3657,9.基金项目
国家自然科学基金资助项目(52260025,52004114) （52260025,52004114）
江西省科学院省级科研项目经费包干制试点示范项目(2022YSBG50002,2023YSBG21006,2022YSBG21008,2023YSBG22008,2023YRCS005) （2022YSBG50002,2023YSBG21006,2022YSBG21008,2023YSBG22008,2023YRCS005）
江西省自然科学基金资助项目(20232BAB213081)(Projects(52260025,52004114)supported by the National Natural Science Foundation of China （20232BAB213081）
Projects(2022YSBG50002,2023YSBG21006,2022YSBG21008,2023YSBG22008,2023YRCS005)supported by the Pilot Demonstration Project of Lump-sum Funding System for Provincial-level Scientific Research Projects of Jiangxi Academy of Sciences （2022YSBG50002,2023YSBG21006,2022YSBG21008,2023YSBG22008,2023YRCS005）
Project(20232BAB213081)supported by the Natural Science Foundation of Jiangxi Province) （20232BAB213081）
