Reducing nitrogen loss from farmland by layered double hydroxide-supported carbon dots-enhanced ammonium immobilization

• Published in: Chemosphere (Oxford) 2024-03, Vol.351, p.141160-141160, Article 141160
• Main Authors: Yan, Yixin, Wang, Wei, Liu, Fan, Zhang, Mengnan, Gao, Jianlei, Lu, Chao
• Format: Article
• Language: English
• Subjects: Ammonium adsorption; Carbon dots; Layered double hydroxides; Soil immobilization
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2024.141160

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. [Display omitted] •Synthesized Ca/Al layered double hydroxide-supported carbon dots (CDs@Ca/Al-LDHs).•CDs@Ca/Al-LDHs exhibited a negative charge under neutral pH conditions.•Electrostatic interaction occurred between ammonium and CDs@Ca/Al-LDHs.•The adsorption capacity for ammonium was 4–5 times that of biochar and zeolite.•Leaching ammonium and nitrate was reduced by 6.3% and 9.7% at a dosage of 0.1%.