成果归属作者：

丁浩 ; 吕国诚

成果归属机构：

材料科学与工程学院

作者：

Zhang, Han ; Bai, Xuefeng ; Ji, Hua ; Yu, Xiaochuan ; Li, Rui ; Sun, Sijia ; Lv, Guocheng ; Ding, Hao

单位：

China Univ Geosci Beijing, Minist Educ Geol Carbon Storage & Low Carbon, Beijing Key Lab Mat Utilizat Nonmet Minerals & Sol, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Engn Re, Beijing 100083, Peoples R China;SUEZ Environm Technol Beijing Co Ltd, Taikang Finance Bldg 38, Dong San Huan North Rd, Beijing 100026, Peoples R China

关键词：

WASTE; LEAD; ADSORPTION; EFFICIENT; CARBONATE; WATER

摘要：

Lead ions (Pb(II)) cause serious environmental pollution and endanger human health and it is urgent to carry out efficient treatment. Herein, a strategy was proposed to enhance the immobilization and removal of Pb(II) (including trace Pb(II)) from water by coating SiO2 on the surface of CaCO3 to prepare CaCO3@SiO2 composites using the carbonation method. The findings revealed that SiO2 coating exhibits strong activation effects on CaCO3. The SiO2 coating (loaded at 8.62 wt%) increased CaCO3 specific surface area by over 20-fold, confirming its activating effect. The maximum immobilization amount of Pb(II) by CaCO3@SiO2 reached 3354 mg/g (over twice that of CaCO3), and the removal rate of trace Pb(II) (100 mu g/L) was 99.5 %. The residual Pb(II) concentration (5.5 mu g/L) complies with WHO drinking water standard. Furthermore, CaCO3@SiO2 showed selective removal of Pb(II), maintaining an 87 % percentage removal after 5 cycles of recycling. This study quantified dual mechanisms: surface adsorption-complexation dominated at low concentrations (100 % at 10 mg/L), while dissolution-precipitation plays the primary role at high concentrations (99.39 % at 500 mg/L), the removal mechanism of CaCO3@SiO2 was greatly affected by the initial concentration of Pb(II), therefore, the accurate contribution rate of each mechanism at different concentrations was calculated. The synergistic effect of CaCO3, its surface coated SiO2, and the rate of increase in the system pH value was found to be the fundamental reason for the significant increase in the immobilization of Pb(II) by CaCO3@SiO2.

基金：

Xiong'an New Area Science and Technology Innovation Special Program [2023XAGG0068]

语种：

英文

DOI：

10.1016/j.matchemphys.2025.131720

来源：

MATERIALS CHEMISTRY AND PHYSICS,2026():.

出版日期：

2026-01-15

提交日期：

2025-12-08

引用参考：

Zhang, Han; Bai, Xuefeng; Ji, Hua; Yu, Xiaochuan; Li, Rui; Sun, Sijia; Lv, Guocheng; Ding, Hao. Synergistic dual mechanisms in SiO2-Activated CaCO3 composites: Enhanced Pb(II) removal and trace contaminant purification[J]. MATERIALS CHEMISTRY AND PHYSICS,2026():.