{"title":"Evaluating biochar for adsorption of ammonium nitrogen in wastewater:insights into modifications and mechanisms","authors":"Yuheng Zhu , Sichen Liu , Hanbo Chen , Pingfeng Yu , Chongjun Chen","doi":"10.1016/j.envres.2025.121615","DOIUrl":null,"url":null,"abstract":"<div><div>Ammonium nitrogen (NH<sub>4</sub><sup>+</sup>) is a highly recalcitrant pollutant, leading to severe degradation of aquatic ecosystems and posing serious risks to human health. The application of biochar for NH<sub>4</sub><sup>+</sup> removal from wastewater has gained widespread attention. However, its inherent limitations in adsorption capacity present a significant constraint on its broader practical implementation. To address this limitation, various modification techniques have been developed to endow biochar with a range of physicochemical properties. In this review, a systematic investigation was conducted to assess the efficacy of various modification methods on the adsorptive capacity of biochar for NH<sub>4</sub><sup>+</sup> in aqueous solutions. Additionally, this review summarizes the adsorption mechanisms which are divided into five categories: hydrogen bonding, pore filling, electrostatic interaction, ion exchange and surface complexation. This review offers valuable insights into the strategies for achieving enhanced adsorption of NH<sub>4</sub><sup>+</sup> by modified biochar, along with a comprehensive summary of the associated removal mechanisms.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"277 ","pages":"Article 121615"},"PeriodicalIF":7.7000,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Research","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0013935125008667","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/4/14 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Ammonium nitrogen (NH4+) is a highly recalcitrant pollutant, leading to severe degradation of aquatic ecosystems and posing serious risks to human health. The application of biochar for NH4+ removal from wastewater has gained widespread attention. However, its inherent limitations in adsorption capacity present a significant constraint on its broader practical implementation. To address this limitation, various modification techniques have been developed to endow biochar with a range of physicochemical properties. In this review, a systematic investigation was conducted to assess the efficacy of various modification methods on the adsorptive capacity of biochar for NH4+ in aqueous solutions. Additionally, this review summarizes the adsorption mechanisms which are divided into five categories: hydrogen bonding, pore filling, electrostatic interaction, ion exchange and surface complexation. This review offers valuable insights into the strategies for achieving enhanced adsorption of NH4+ by modified biochar, along with a comprehensive summary of the associated removal mechanisms.
期刊介绍：
The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
