Nitrogen-based fertilizer recovery from nitrate wastewater: A novel electrocatalyst for ammonia synthesis and a new strategy for ammonia absorption.
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| Title: | Nitrogen-based fertilizer recovery from nitrate wastewater: A novel electrocatalyst for ammonia synthesis and a new strategy for ammonia absorption. |
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| Authors: | Yang, Li-Hui1 (AUTHOR) yanglh2@126.com, Liao, Man-Ting1 (AUTHOR), Lin, Ze-Qin1 (AUTHOR), Pan, Jian-Xin1 (AUTHOR), Li, Wei1 (AUTHOR), Lv, Si-Hao1 (AUTHOR), Cheng, Hao-Yi1,2 (AUTHOR) chenghaoyihit@126.com |
| Source: | Separation & Purification Technology. Nov2024, Vol. 348, pN.PAG-N.PAG. 1p. |
| Subjects: | Nitrogen fertilizers, Waste recycling, Wastewater treatment, Fertilizers, Electrolytic reduction |
| Abstract: | [Display omitted] • A high-entropy perovskite oxide, La(MnFeCoCuZn) 0.2 O 3 (LMFCCZ), was successfully synthesized. • The performance of NO 3 RR on LMFCCZ outperformed most conventional perovskites. • A novel strategy of using acidic anolyte to provide H+ for NH 3 recovery was introduced. • A nitrogen-potassium compound fertilizer was formed from NO 3 –-N wastewater with paired electrolysis. Electrochemically upcycling wastewater nitrogen, such as nitrate (NO 3 –-N), into a nitrogen fertilizer (e.g., (NH 4) 2 SO 4), holds promise for wastewater treatment and resource recovery. However, two challenges remain: finding an efficient catalyst for electrocatalytic NO 3 –-N reduction into NH 3 (NO 3 RR) and developing a suitable strategy for subsequent NH 3 separation and recovery. In this study, a high-entropy perovskite oxide, La(MnFeCoCuZn) 0.2 O 3 (LMFCCZ), was synthesized and applied for NO 3 RR, illustrating excellent performance with an NH 3 yield rate of 1.5 ± 0.04 mg/(cm2·h) and a FE of 95.0 ± 1.53 % at a potential of −1.1 V vs. RHE. Furthermore, a novel strategy of using acidic anolyte instead of external acid to provide H+ ions for NH 3 separation and recovery was introduced. As a result, paired electrolysis was fully employed to recover nitrogen-based fertilizer from NO 3 –-N without any chemicals addition. Specifically, when acidic anolyte containing 50 mM K 2 SO 4 was served as the absorption liquid, the NH 3 recovery efficiency reached 70.9 ± 3.0 %, and a solid powder containing both nitrogen (N) and potassium (K) was obtained, suggesting the formation of N-K compound fertilizer. This study not only extends the application of high-entropy perovskite oxides in NO 3 RR but also opens a novel avenue for utilization of anodic reactions for nitrogen-based fertilizer recovery. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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