Ultra-strong adsorption of ammonia nitrogen from low-temperature and complex systems by Prussian blue analogue

• Published in: Separation and purification technology Vol. 355; p. 129700
• Main Authors: Zhang, Zonghui, Zhao, Lele, Chen, Jingru, Wang, Yuqiong, Liu, Yanyan, Hou, Xiaohong, Qu, Jianhua, Lv, Chongning, Hu, Qi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2025
• Subjects: Adsorption; Ammonia nitrogen; MOFs; Prussian blue; Selectivity; Prussian blue; Selectivity; MOFs; Adsorption; Ammonia nitrogen
• ISSN: 1383-5866
• DOI: 10.1016/j.seppur.2024.129700

[Display omitted] •The adsorption of Co-PBA with high selectivity, high capacity, and high removal.•The high adsorption (52.72 mg/g) of Co-PBA was demonstrated by comparison.•NH3-N was accurately recognized by Co-PBA in complex systems.•The adsorption mechanism of NH3-N by Co-PBA was revealed from multiple dimensions.•The combination with coagulation reduced turbidity and enhanced ammonium removal. The aquatic ecosystem is threatened globally by eutrophication due to ammonia nitrogen inputs from wastewater. Developing high-performance adsorbents with high removal efficiency and selectivity for ammonia nitrogen is pivotal to ecological equilibrium. Here, the removal of ammonia nitrogen by a combined process of Co-based Prussian blue (NaCo-PBA) and coagulants was studied for the first time. The maximum adsorptive capacity of ammonia nitrogen by NaCo-PBA was 52.72 mg/g, and the removal reached 99 %. Compared with traditional adsorbents, NaCo-PBA showed high adsorption amounts (9–42 times). Most importantly, NaCo-PBA exhibited selectivity in complex systems and its adsorption quantity reached 42.6 mg/g in real domestic wastewater, compared to 4.7 mg/g for commercial adsorbent. NaCo-PBA was used in the coagulation and co-adsorption process to facilitate the separation of multiple contaminants in water. It is reasonable to believe that the collaboration between NaCo-PBA with special structure and coagulation will bring a new perspective to nitrogen removal in complex systems.