Abstract
Acid-washed coal fly ash (AW-CFA) was subjected to wet grinding activation followed by hydrothermal crystallization to synthesize P zeolite (FAZ-P). The FAZ-P obtained at 120 °C for 24 h exhibited a maximum relative crystallinity of 93.15% and was employed for the adsorption of Cr3+, Ni2+, and Co2+ from aqueous solutions. The zeolitization of coal fly ash (CFA) leads to an increase in specific surface area to 44.00 m2/g, resulting in the formation of nano-sized P zeolite crystals with uniformly narrow fissures and sizes within the range of 10–30 nm. Adsorption experimental results indicate that FAZ-P exhibits maximum adsorption capacities of 49.03 mg/g for Cr3+, 22.20 mg/g for Ni2+, and 27.25 mg/g for Co2+. The adsorption equilibrium data for both mixed and single-metal ion solutions conform to the Langmuir model, with the affinity sequence for heavy metal ions being Cr3+ > Co2+ > Ni2+. The pseudo-first-order and pseudo-second-order kinetic models effectively described the adsorption behavior of Cr3+, Ni2+, and Co2+. Increasing the initial pH value of the solution significantly enhanced the adsorption capacity of the adsorbent for heavy metal ions. The removal mechanism of metal ions involves both adsorption and ion exchange processes. The thermodynamic parameters indicated that the adsorption process was spontaneous and endothermic.
Graphical Abstract
This study utilizes solid waste pollutant coal fly ash as a raw material, synthesizing coal fly ash-based P zeolite through wet mechanical grinding activation and hydrothermal crystallization. The synthesized zeolite exhibits excellent heavy metal adsorption performance, offering the potential for resource utilization of coal fly ash and sustainable industrial applications through waste-to-waste processing.
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This work was supported by the Shandong Key Research and Development Plan (No. 2020CXGC011402) and the Shandong Province Natural Science Foundation (No. ZR2020ME190).
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All authors contributed to the study’s conception and design. Material preparation, data collection, and analysis were performed by Zhiyuan Liu and Xingxing Cheng. The first draft of the manuscript was written by Zhiyuan Liu, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Highlights
• Mechanical grinding and alkali solutions produce synergistic activation of coal fly ash.
• Crystallization conditions can affect the relative crystallinity and phase purity of synthesized zeolites.
• The synthesized zeolite exhibits significantly higher surface area and pore volume compared to coal fly ash, offering increased adsorption sites for heavy metal removal.
• The removal mechanism of heavy metal ions by synthetic zeolite involves ion exchange and hydrous precipitation.
• The adsorption of heavy metal ions is an endothermic and spontaneous process.
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Liu, Z., Cheng, X. Preparation and characterization of P-type zeolite for adsorption of Cr3+, Ni2+, and Co2+. Environ Sci Pollut Res 31, 23664–23679 (2024). https://doi.org/10.1007/s11356-024-32623-4
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DOI: https://doi.org/10.1007/s11356-024-32623-4