Abstract
A hydrothermal synthesis method was developed to produce high crystallinity ZSM-5 zeolite using coal gasification coarse slag (CGCS) as the raw material. Instead of the expensive NaOH(s.), Na2SiO3(s.) was utilized to activate, depolymerize, and recombine Si and Al elements in the CGCS. The mother liquor circulation technology was employed to recover and reuse raw materials and residual reagents (Na2SiO3(aq.) and TPABr), reducing waste emissions and enhancing resource utilization efficiency. The synthesized ZSM-5 had a specific surface area of 455.675 m2 g−1, pore volume of 0.284 cm3 g−1, and pore diameter of 2.496 nm. The influence of various factors on the morphology and crystallinity of ZSM-5 was investigated, resulting in the production of ZSM-5 with higher specific surface area and pore volume. Adsorption experiments showed that WU-ZSM-5 exhibited a removal efficiency of 85% for ammonia nitrogen (NH4+-N(aq.)), validating its effectiveness in coal chemical wastewater purification. The mother liquor recycling technology enabled zero-emission utilization of solid waste resources and improved the utilization rate of alkali and template to 90%. These results demonstrate the potential application of the developed method in the efficient treatment of coal chemical wastewater.
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This study is supported by the Natural Science Foundation of Ningxia Province, China (2023AAC02008) and the National Natural Science Foundation of China (22366031).
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Lu Ma: Conceptualization, data curation, writing—original draft. Kangning Li: Visualization, software, investigation. Yi **ao: Writing—review and editing. Keren Shi: Software, formal analysis. Yulin Ma: Resources, validation. Mei Yang: Investigation, software. Yifei Yang: Resources, visualization. Yuanyuan Li: Supervision, writing—review and editing. Yulong Ma: Writing—review and editing. Yonggang Sun: Writing—review and editing. Wenxin Ji: Methodology, supervision, writing—review and editing.
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Ma, L., Li, K., **ao, Y. et al. Hydrothermal synthesis of high crystallinity ZSM-5 zeolite from coal gasification coarse slag and mother liquor circulation for efficient coal chemical wastewater purification. Environ Sci Pollut Res 31, 36849–36860 (2024). https://doi.org/10.1007/s11356-024-33264-3
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DOI: https://doi.org/10.1007/s11356-024-33264-3