Water-soluble chitosan promotes remediation of Pb-contaminated soil by Hylotelephium spectabile

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Bingxin Guo, Yiwei Zhang, Junxing Yang, Tianwei Qian, Junmei Guo, Xiaona Liu, Yuan Jiao, Tongbin Chen, Guodi Zheng, Wenjun Li, Fei Qi
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Abstract

Water-soluble chitosan (WSC) has been studied for its ability to mobilize soil Pb and promote the phytoremediation by Hylotelephium spectabile in Pb-contaminated fields. We aimed to clarify the internal mechanism by which WSC impacts phytoremediation by examining plant growth and Pb accumulation performance of H. spectabile as well as the Pb form, functional groups, and mineral phases of Pb-contaminated soil. WSC effectively decreased soil pH and activated Pb migration in rhizosphere soils, with a considerable increase in water-soluble and acid-extractable Pb by 29%–102% and 9%–65%, respectively, and a clear decreasing trend in reducible and oxidizable Pb. Fouriertransform infrared spectroscopy revealed a significant increase in amino and hydroxyl groups in the soil generated by WSC. The coordination of Pb with amino and hydroxyl groups may play an important role in the formation of Pb complexes and activation of Pb in soil. In field trials, the application of WSC significantly increased Pb accumulation in H. spectabile by 125.44%, reaching 92 g/hm2. Moreover, the organic matter and nitrogen in the soils were increased by WSC, which improved the growth conditions of H. spectabile. No obvious growth inhibition was observed in either the pot or field trials. Therefore, WSC is a promising chelating agent for mobilizing Pb in soil. Additionally, WSC can be potentially used to boost H. spectabil-mediated phytoremediation of Pb-contaminated farmland.

Abstract Image

水溶性壳聚糖促进分光木碱对铅污染土壤的修复
水溶性壳聚糖(WSC)能够调动土壤中的铅,并促进分光草(Hylotelephium spectabile)在铅污染田中的植物修复。我们旨在通过研究 Hylotelephium spectabile 的植物生长和铅积累性能以及铅污染土壤的铅形态、功能基团和矿物相,阐明 WSC 影响植物修复的内部机制。WSC 有效降低了土壤 pH 值,激活了根瘤土壤中的铅迁移,水溶性铅和酸性可萃取铅分别增加了 29%-102% 和 9%-65%,还原性铅和氧化性铅呈明显下降趋势。傅里叶变换红外光谱显示,水循环沉降法产生的土壤中的氨基和羟基显著增加。铅与氨基和羟基的配位可能在土壤中形成铅络合物和活化铅方面起着重要作用。在田间试验中,施用 WSC 使 H. spectabile 的铅累积量显著增加了 125.44%,达到 92 g/hm2。此外,WSC 还增加了土壤中的有机质和氮,改善了 H. spectabile 的生长条件。无论是盆栽试验还是田间试验,都没有观察到明显的生长抑制现象。因此,氯化石蜡是一种很有前景的螯合剂,可以调动土壤中的铅。此外,WSC 还可用于促进由光谱鞘氨醇介导的对铅污染农田的植物修复。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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