School of Materials Engineering, Changshu Institute of Technology, 215500, China; Suzhou Key Laboratory of Functional Ceramic Materials, Changshu Institute of Technology, Changshu, 215500, China; School of Chemical Engineering & Technology, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.
School of Materials Engineering, Changshu Institute of Technology, 215500, China; Suzhou Key Laboratory of Functional Ceramic Materials, Changshu Institute of Technology, Changshu, 215500, China.
Chemosphere. 2023 Jun;325:138397. doi: 10.1016/j.chemosphere.2023.138397. Epub 2023 Mar 14.
The feasibility and potential mechanisms of the self-alkali activation brought by municipal solid waste incineration (MSWI) fly ashes to the self-cementation of arsenic-contaminated soils were quantitatively evaluated and comprehensively analyzed to avoid the additional application of the alkali activators and binder materials traditionally. The employment of the two kinds of precursor materials achieved the self-alkali-activated self-cementation ('double self') under ambient conditions. The largest compressive strength (MPa) of 25.64 and lowest leaching toxicities (mg/L) of 21.05, 2.86, 0.08, 0.02, 2.05, and 0.34 for Zn, Cu, Cr, Cd, Pb, and As were obtained in the solidified matrix. Geopolymerization kinetics of the 'double self' cementation can be mathematically fitted by the Johnson-Mehl-Avrami-Kolmogorov model. CaClOH and halite in the MSWI fly ashes set up the self-alkali activation by reacting with the kaolinite and quartz in soils contaminated with arsenic by forming layered hydration and three-dimensional geopolymerization products to push for self-cementation.
定量评估和综合分析了城市固体废物焚烧（MSWI）飞灰的自碱激发对砷污染土壤的自胶结的可行性和潜在机制，以避免传统上额外应用碱激发剂和粘结材料。这两种前体材料的使用在环境条件下实现了自碱激发自胶结（“双重自”）。在固化基质中获得了最大抗压强度（MPa）为 25.64 和最低浸出毒性（mg/L）为 21.05、2.86、0.08、0.02、2.05 和 0.34 的 Zn、Cu、Cr、Cd、Pb 和 As。“双重自”胶结的地质聚合动力学可以通过 Johnson-Mehl-Avrami-Kolmogorov 模型进行数学拟合。MSWI 飞灰中的 CaClOH 和石盐通过与土壤中的高岭石和石英反应，形成层状水合和三维地质聚合产物，建立自碱激发，推动自胶结，从而与砷污染土壤中的 kaolinite 和 quartz 反应，建立自碱激发。
