Remediation of cadmium-contaminated soil with iron-modified montmorillonite: Insight for cadmium bioavailability and rhizosphere soil bacterial community

IF 6.8 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

alexandria engineering journal Pub Date : 2025-09-22 DOI:10.1016/j.aej.2025.09.024

Chenchen Zhao , Jihai Gu , Yuming Zhang , Jie Zhang , Jingqi Zhao , Fengsong Liu

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引用次数: 0

Abstract

Cadmium (Cd) contamination in agricultural soils poses serious environmental and food safety risks. This study evaluated the remediation potential of iron-modified montmorillonite (GMt) for Cd contamination in rhizosphere soils through pot experiments using perennial ryegrass (Lolium perenne L.). The results showed that the application of GMt improved the physical and chemical properties of the soil (pH, total nitrogen, available nitrogen, and available potassium). GMt significantly reduced Cd bioavailability by 53.48 %-87.04 % (p < 0.05), accompanied by a decrease in acid-soluble and reducible Cd fractions and an increase in oxidizable and residual fractions. GMt also enhanced soil urease and catalase activity (p < 0.05), optimized rhizosphere bacterial community structure, particularly enriching genera associated with nutrient cycling and heavy metal tolerance. GMt reduced Cd accumulation in ryegrass by 23.54 %-27.03 %, lowering the risk of Cd entering the food chain. These findings highlight that GMt is a promising amendment for immobilizing Cd and has broad application prospects in improving soil health and ensuring food security.

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铁改性蒙脱土修复镉污染土壤：镉生物有效性和根际土壤细菌群落的研究

农业土壤中的镉污染具有严重的环境和食品安全风险。以多年生黑麦草（Lolium perenne L.）为材料，通过盆栽试验，评价了铁改性蒙脱土（GMt）对根际土壤镉污染的修复潜力。结果表明，施用GMt改善了土壤的理化性质（pH、全氮、速效氮和速效钾）。GMt显著降低了Cd的生物利用度，降低幅度为53.48 %-87.04 % (p <； 0.05)，并伴有酸溶性和可还原性Cd组分的减少以及可氧化性和残留组分的增加。GMt还提高了土壤脲酶和过氧化氢酶活性（p <； 0.05），优化了根际细菌群落结构，特别是与养分循环和重金属耐受性相关的富集属。GMt降低了黑麦草中Cd的累积量23.54 %-27.03 %，降低了Cd进入食物链的风险。这些结果表明，GMt是一种很有前途的固定化镉改良剂，在改善土壤健康和保障粮食安全方面具有广阔的应用前景。

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来源期刊

alexandria engineering journal Engineering-General Engineering

CiteScore

11.20

自引率

4.40%

发文量

1015

审稿时长

43 days

期刊介绍： Alexandria Engineering Journal is an international journal devoted to publishing high quality papers in the field of engineering and applied science. Alexandria Engineering Journal is cited in the Engineering Information Services (EIS) and the Chemical Abstracts (CA). The papers published in Alexandria Engineering Journal are grouped into five sections, according to the following classification: • Mechanical, Production, Marine and Textile Engineering • Electrical Engineering, Computer Science and Nuclear Engineering • Civil and Architecture Engineering • Chemical Engineering and Applied Sciences • Environmental Engineering