Adsorption performance of 1,4-dioxane by MCM-22 and Beta zeolites and their bio-zeolite composite system in the presence of co-contaminants

• Published in: Separation and purification technology 2025-02, Vol.354, p.128752, Article 128752
• Main Authors: Tian, Kun, Tan, Ding, Fu, Xingjia, Zhang, Yue, Yao, Dandan, Zhong, Ming, Chen, Ruihuan, Dong, Yuanhua, Liu, Yun
• Format: Article
• Language: English
• Subjects: 1,4-Dioxane; Adsorbent; Bio-inhibition; Bio-zeolite; Zeolite
• ISSN: 1383-5866
• DOI: 10.1016/j.seppur.2024.128752

[Display omitted] •MCM-22 and Beta zeolites demonstrate notable efficacy in 1,4-dioxane adsorption.•Ultra-micropores and Brønsted acid sites play pivotal roles in 1,4-dioxane adsorption.•Microbial consortia exhibit effective regeneration of the spent adsorbents.•Bio-zeolites mitigate bio-inhibition induced by Cu2+ and Ag+. Addressing the significant challenge of efficiently separating 1,4-dioxane from aquatic environments using traditional adsorbents is crucial. In this study, we evaluated the adsorption performance of MCM-22 and Beta zeolites. Both were identified as highly effective adsorbents. Equilibrium adsorption of 1,4-dioxane was achieved within 20 min for an initial concentration of 500 mg L-1 on both MCM-22 and Beta zeolites. At 288 K, the maximum adsorption capacities fitted by Langmuir isotherm were 79.66 mg g−1 for MCM-22 and 121.66 mg g−1 for Beta zeolite. Fixed-bed column studies demonstrated that the Yan model properly predicted the behavior of both zeolites under varying flow rates. Additionally, MCM-22 exhibited a wider pore size distribution compared to Beta zeolite, while Beta zeolite demonstrated a higher volume of ultra-micropores (