Bifunctional chitosan-modified urea–formaldehyde fertilizer for soil restoration and slow, sustained nitrogen release

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research Pub Date : 2025-05-19 DOI:10.1016/j.envres.2025.121902

Zhenglu Yang, Biao Yuan, Pan Wu, Jian He, Changjun Liu, Wei Jiang

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引用次数: 0

Abstract

Nutrient supply and heavy metals (HMs) remediation are key for agricultural development. However, achieving both goals with a single agent is challenging. In this study, bifunctional chitosan-modified urea–formaldehyde (CSUF) gel beads having a three-dimensional structure were developed to serve as a slow-release nitrogen fertilizer and a HM fixative for soil treatment. The adsorption capacities for Cd(II), Cu(II), and Cr(VI) reached 49.8, 6.63, and 40 mg/g, respectively. Further, over 10 d, CSUF removed 86 %, 93.28 %, and 91.32 % of Cd(II), Cu(II), and Cr(VI), respectively, from the soil while releasing 40 % of the nitrogen. Crucially, the adsorbed HM ions were not re-released, although the nitrogen continued to be released for 15 d. Plant growth experiments indicated that CSUF promoted mung bean sprout growth, increasing the dry and fresh weights by 33.33 % and 47.83 %, respectively, and significantly mitigating HM stress effects by reducing the Cd(II), Cu(II) and Cr(VI) content in the plant tissue by 89.28 %, 92.08 %, and 94.97 %, respectively. Overall, the bifunctional fertilizer shows potential for promoting sustainable agriculture.

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双功能壳聚糖改性脲甲醛肥料用于土壤修复和缓慢、持续的氮素释放

养分供应和重金属修复是农业发展的关键。然而，用单个代理实现这两个目标是具有挑战性的。在本研究中，开发了具有三维结构的双功能壳聚糖修饰脲醛（CSUF）凝胶珠，作为缓释氮肥和HM固定剂用于土壤处理。对Cd（II）、Cu（II）和Cr（VI）的吸附量分别达到49.8、6.63和40 mg/g。此外，在10 d内，CSUF分别从土壤中去除86%、93.28%和91.32%的Cd（II）、Cu（II）和Cr(VI)，同时释放40%的氮。重要的是，尽管氮持续释放了15 d，但被吸附的HM离子没有被重新释放。植物生长试验表明，CSUF促进了绿豆芽的生长，干重和鲜重分别提高了33.33%和47.83%，植物组织中Cd（II）、Cu（II）和Cr（VI）含量分别降低了89.28%、92.08%和94.97%，显著缓解了HM胁迫效应。总的来说，双功能肥料显示出促进可持续农业的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Research 环境科学-公共卫生、环境卫生与职业卫生

CiteScore

12.60

自引率

8.40%

发文量

2480

审稿时长

4.7 months

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.