氢氧化铵
吸附
铵
化学
浸出(土壤学)
沸石
生物炭
无机化学
氢氧化物
尿素氨挥发
水溶液
氮气
碳纤维
硝化作用
复合数
材料科学
有机化学
土壤水分
催化作用
复合材料
环境科学
土壤科学
热解
作者
Yixin Yan,Wei Wang,Ling Fan,Mengnan Zhang,Jianlei Gao,Chao Lu
出处
期刊:Chemosphere
[Elsevier]
日期:2024-03-01
卷期号:351: 141160-141160
标识
DOI:10.1016/j.chemosphere.2024.141160
摘要
It remains a significant challenge to develop a kind of cost-effective and eco-friendly adsorbent with strong immobilization capabilities for ammonium in farmland. In this work, we employed Ca/Al layered double hydroxide-supported carbon dots (CDs@Ca/Al-LDHs) as a novel and efficient adsorbent for ammonium immobilization both in aqueous and soil environments. Such a composite could exhibit a high adsorption capacity towards ammonium in solution, which was four times higher than zeolite and three times higher than biochar under the same conditions. The mechanism investigations revealed that electrostatic interactions between the negatively charged CDs and the positively charged ammonium played a key role in the adsorption. In 30-day leaching experiments, the fabricated composite cumulatively reduced ammonium and nitrate by 6.3% and 9.7%, respectively at a dosage of 0.1% (w/w). Incubation experiments further confirmed that the developed composite could effectively inhibit ammonia volatilization and nitrification by immobilizing the ammonium within soil matrices. Our results demonstrated that CDs@Ca/Al-LDHs represented a promising candidate for cost-effective and eco-friendly immobilization of excess ammonium from over-fertilized farmland.
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