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Hydrothermal Synthesis of Analcime from Construction Waste Bricks and Its Adsorption Mechanism for Pb2+

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Abstract

Construction waste bricks were used as raw materials to synthesize analcime through a hydrothermal method, and it was employed for the adsorption of simulated wastewater containing Pb2+. Firstly, the effects of NaOH concentration, reaction temperature, and time on the synthesis of zeolite were investigated. Then, the impacts of adsorption time, temperature, initial Pb2+ concentration, and pH on the adsorption performance were studied. The adsorption kinetics and thermodynamic characteristics were discussed. The results show that the optimal conditions for the hydrothermal synthesis of analcime are NaOH concentration of 2 mol/L, hydrothermal temperature of 160 °C, and reaction time of 6 h. The product has a specific surface area of 25.52 m2/g, a total pore volume of 0.232 cm3/g, an average pore size of 18.22 nm, and a CEC of 114.351 meq/100 g. The adsorption capacity of analcime for Pb2+ is positively correlated with the initial Pb2+ concentration, temperature, time, and pH. The adsorption of Pb2+ by analcime follows two-stage adsorption kinetics equations, and the intraparticle diffusion process is the rate-controlling step but not the sole step. The adsorption behavior includes monolayer adsorption and multilayer adsorption, which is a complex adsorption mechanism involving both chemical adsorption and physical adsorption. The adsorption process was spontaneous and endothermic.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant 42207419), the Special Funds Project for Technological Innovation Promoted by Xuzhou City, China (KC23081), and Huaibei City Science and Technology Program (Grant HK2022AB001). Special gratitude is given to editors for their efforts in treating and evaluating the work, and the valuable comments of the anonymous reviewers are also greatly acknowledged.

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Junjie Zhou: Formal analysis, Software, Data Curation, Writing-Original draft preparation. Shuangsheng Zhang: Conceptualization, Methodology, Organization, Reviewing and Editing, Supervision. Hangjun Shi: Data Curation, Validation. Jing Qiang: Funding acquisition, Supervision. Huan Dong: Data Curation, Validation. Hanhu Liu: Investigation, Funding acquisition.

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Correspondence to Shuangsheng Zhang.

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Zhou, J., Zhang, S., Shi, H. et al. Hydrothermal Synthesis of Analcime from Construction Waste Bricks and Its Adsorption Mechanism for Pb2+. Water Air Soil Pollut 235, 186 (2024). https://doi.org/10.1007/s11270-024-06995-9

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  • DOI: https://doi.org/10.1007/s11270-024-06995-9

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