Upcycling Municipal Solid Incineration Fly Ash into Layered Double Hydroxide Nanomaterials: Heavy Metal Immobilization and Environmental Risk Assessment.
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| Title: | Upcycling Municipal Solid Incineration Fly Ash into Layered Double Hydroxide Nanomaterials: Heavy Metal Immobilization and Environmental Risk Assessment. |
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| Authors: | Zhao, Yue1 (AUTHOR), Wang, Xiaona2,3 (AUTHOR), Zhang, Ze3,4 (AUTHOR), Xu, Menglan4,5 (AUTHOR) 15376594909@163.com |
| Source: | Nanomaterials (2079-4991). Jun2026, Vol. 16 Issue 11, p697. 12p. |
| Subjects: | Fly ash, Layered double hydroxides, Solid waste management, Waste salvage, Environmental risk assessment, Nanostructured materials, Chelating agents |
| Abstract: | Municipal solid waste incineration fly ash (MSWI FA) represents a significant environmental challenge due to its high content of toxic heavy metal (HM) and large-scale generation. This study demonstrates the feasibility pathway for converting hazardous MSWI FA into well-crystallized layered double hydroxide nanosheets (LDH-FA). Sodium dimethyl dithiocarbamate (SDD) was incorporated as a chelating stabilizer to enable synergistic HM immobilization during acid leaching and crystallization. High-resolution transmission electron microscopy (HRTEM) confirmed the characteristic two-dimensional nanosheet morphology with interlayer spacings consistent with LDH structures, while elemental mapping revealed homogeneous distribution of Pb and Zn within the nanosheet matrix. SDD dosages higher than 1.0 wt% effectively suppressed HM leaching, and Pb concentrations were controlled below 0.1 mg/L and Zn maintained at minimal levels. BCR sequential extraction analysis further demonstrated that SDD treatment effectively transformed HMs from bioavailable acid-soluble fractions to stable forms. This investigation establishes an innovative approach to MSWI FA resource utilization and provides mechanistic insights into HM stabilization within LDH nanostructures, offering a scientific basis for safer applications of waste-derived nanomaterials. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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