Peipei Song, Fupeng Song, Jin Liu, Wenjing Ma, Xiaoyu Gao
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The immobilization mechanism was analyzed, including ion exchange, physical adsorption, surface complexation, electrostatic attraction as well as co-precipitation. Besides, nZVI@BC remarkably promoted soil catalase activity, but inhibited urease and FDA hydrolase activities. Furthermore, the effects and differences on the diversity, abundance, and species composition of soil microbial communities were deeply explored. The order of bacterial community richness in each group was CK > Cd > BC > nZVI@BC, and the bacterial community diversity was CK > nZVI@BC > Cd > BC. The greatest difference of species abundance composition was observed between nZVI@BC treatment group and the control. Additionally, forty-three biomarkers were screened, which primarily belonged to , , , and . 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引用次数: 0
摘要
目前,镉(Cd)污染土壤的现象日益严重,不利于土壤健康。本研究合成了生物炭(BC)和生物炭负载纳米级零价铁(nZVI@BC),用于镉污染土壤的修复。综合讨论了反应时间、用量、nZVI负载量等各种因素对镉分馏、土壤可利用铁、pH值、CEC和土壤酶活性的影响。结果表明,nZVI@BC 对镉的固定效果更佳,且与用量和反应时间呈正相关,而与 nZVI 的负载量呈负相关。因此,5% nZVI@BC(1:3)的效果最好。随着 nZVI 负荷的增加,土壤中的可利用铁、pH 值和 CEC 值都显著提高。分析了固定化机理,包括离子交换、物理吸附、表面络合、静电吸引和共沉淀。此外,nZVI@BC 显著促进了土壤过氧化氢酶的活性,但抑制了脲酶和 FDA 水解酶的活性。此外,还深入探讨了 nZVI@BC 对土壤微生物群落多样性、丰度和物种组成的影响和差异。各组细菌群落丰富度顺序为 CK > Cd > BC > nZVI@BC,细菌群落多样性顺序为 CK > nZVI@BC > Cd > BC。nZVI@BC处理组与对照组的物种丰度差异最大。此外,还筛选出 43 个生物标志物,主要属于 、 、 和 。这项研究将为 nZVI@BC 对镉污染土壤的修复及其微生物群落响应提供深厚的理论基础。
Remediation of cadmium-contaminated soil by biochar-loaded nano-zero-valent iron and its microbial community responses
At present, cadmium (Cd)-contaminated soil has been increasingly serious, which is adverse to soil health. In this study, biochar (BC) and biochar-loaded nanoscale zero-valent iron (nZVI@BC) were synthesized for remediation of Cd-contaminated soil. The effects of various factors including reaction time, dosage, nZVI loading on Cd fractionation, soil available iron, pH, CEC, and soil enzyme activity were comprehensively discussed. It can be concluded that nZVI@BC exhibited more excellent immobilization effect of Cd, and was positively correlated with dosage and reaction time, but negatively related to nZVI loading. As a result, 5% nZVI@BC(1:3) performed the best. Soil available iron, pH, and CEC were significantly enhanced with increasing nZVI loading. The immobilization mechanism was analyzed, including ion exchange, physical adsorption, surface complexation, electrostatic attraction as well as co-precipitation. Besides, nZVI@BC remarkably promoted soil catalase activity, but inhibited urease and FDA hydrolase activities. Furthermore, the effects and differences on the diversity, abundance, and species composition of soil microbial communities were deeply explored. The order of bacterial community richness in each group was CK > Cd > BC > nZVI@BC, and the bacterial community diversity was CK > nZVI@BC > Cd > BC. The greatest difference of species abundance composition was observed between nZVI@BC treatment group and the control. Additionally, forty-three biomarkers were screened, which primarily belonged to , , , and . This study will provide the profound theoretical basis for nZVI@BC remediation of Cd-contaminated soil and its microbial community responses.
期刊介绍:
The Journal of Environmental Chemical Engineering (JECE) serves as a platform for the dissemination of original and innovative research focusing on the advancement of environmentally-friendly, sustainable technologies. JECE emphasizes the transition towards a carbon-neutral circular economy and a self-sufficient bio-based economy. Topics covered include soil, water, wastewater, and air decontamination; pollution monitoring, prevention, and control; advanced analytics, sensors, impact and risk assessment methodologies in environmental chemical engineering; resource recovery (water, nutrients, materials, energy); industrial ecology; valorization of waste streams; waste management (including e-waste); climate-water-energy-food nexus; novel materials for environmental, chemical, and energy applications; sustainability and environmental safety; water digitalization, water data science, and machine learning; process integration and intensification; recent developments in green chemistry for synthesis, catalysis, and energy; and original research on contaminants of emerging concern, persistent chemicals, and priority substances, including microplastics, nanoplastics, nanomaterials, micropollutants, antimicrobial resistance genes, and emerging pathogens (viruses, bacteria, parasites) of environmental significance.