Qiu Qili, Zhang Jun, Zhang Dongping, Hu Yulong, Zhou Qi, Zeng Fan
School of Environmental Engineering, Nanjing Institute of Technology, 1#Hongjing Road, Nanjing, 211167, Jiangsu, China.
Ministry of Ecology and Environment, Nanjing Institute of Environmental Science, 8#Jiangwangmiao Street, Nanjing, 210042, Jiangsu, China.
Sci Rep. 2025 May 28;15(1):18751. doi: 10.1038/s41598-025-03368-y.
As a kind of hazardous solid wastes, municipal solid waste incineration (MSWI) fly ash leads to serious environmental pollution. Converting MSWI fly ash into zeolites is an economically beneficial and environmentally sound way of disposal. In this paper, the effect of different additives (kaolin, milled glass powder, NaSiO) on the synthesis of zeolites by microwave-assisted hydrothermal process using MSWI fly ash was investigated through a series of single-factor experiments. The cation exchange capacity (CEC) was used to evaluate the synthesis effect and the adsorption property of zeolites. NaSiO was found to be an ideal additive with the optimal dosage of 30 wt%, and the optimal time of magnetic stirring process was about 8 h. Na-P1 zeolite with high absorbability was synthesized in this condition, whose CEC was about 1.70 meq/g. In addition, the effect of NaSiO dosage and various hydrothermal conditions on the CEC of zeolites were investigated through the orthogonal experiment and analysis of variance. It was found that the NaSiO dosage had the strongest impact on the CEC of zeolites, followed by hydrothermal temperature, concentration of NaOH and hydrothermal time. The work of this paper provides a reference basis for synthesizing high-performance zeolites by MSWI fly ash.
作为一种危险固体废弃物，城市生活垃圾焚烧（MSWI）飞灰会导致严重的环境污染。将MSWI飞灰转化为沸石是一种经济有益且环境友好的处置方式。本文通过一系列单因素实验，研究了不同添加剂（高岭土、磨碎玻璃粉、硅酸钠）对利用MSWI飞灰通过微波辅助水热法合成沸石的影响。采用阳离子交换容量（CEC）来评估沸石的合成效果及吸附性能。结果发现硅酸钠是理想的添加剂，最佳用量为30 wt%，磁力搅拌过程的最佳时间约为8小时。在此条件下合成了具有高吸附性的Na-P1沸石，其CEC约为1.70 meq/g。此外，通过正交实验和方差分析研究了硅酸钠用量及各种水热条件对沸石CEC的影响。结果发现硅酸钠用量对沸石CEC的影响最大，其次是水热温度、氢氧化钠浓度和水热时间。本文的工作为利用MSWI飞灰合成高性能沸石提供了参考依据。
