生物炭固定化神奇变形杆菌Ch8增强木本植物刺槐Cd修复潜力

IF 8.4 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management Pub Date : 2025-02-20 DOI:10.1016/j.jenvman.2025.124620

Zhongliang Huang , Shuqi Niu , Xuejun Li , Jinlin Guo , Zihao Yang , Jinxing Zhou , Yuanlin Cheng , Yi Zhang , Lijuan Jiang , Jinlan Yu , Xuan Zhang , Hui Li

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引用次数: 0

摘要

农业固体废弃物作为生物炭资源化利用具有生态友好、经济高效的特点，但生物炭在镉污染土壤修复中的应用受其效率和田间条件复杂的制约。本研究采用油茶（Camellia oleifera Abel）壳、芦苇秸秆、城市污泥三种原料制备热解生物炭。同时，固定化从刺槐根际分离的高Cd抗性神奇变形杆菌Ch8，形成生物炭-细菌复合材料修复Cd污染土壤。研究了污泥生物炭的热解构型和吸附曲线，发现在700℃下制备的污泥生物炭最适合吸附Cd，污泥生物炭-细菌复合材料（CHB）对Cd的吸附浓度可进一步加速到79.97 mg g−1。在Cd胁迫土壤下，CHB处理刺槐根际后，表明CHB能协同(e值>；0)提高Cd根富集水平（BCF = 3.21），但土壤Cd有效性降低78%，显示出有效的土壤修复潜力。进一步的植物生长参数表明，与未经处理的对照相比，植物生物量和光合作用水平分别提高了2.25倍和2.34倍。此外，CHB在很大程度上提高了根际细菌群落多样性和功能物种，有13种根瘤菌可能对植物具有固氮和促生长作用。本研究深入探讨了生物炭如何与微生物相互作用，改善Cd吸附，提高土壤质量，促进植物生长。通过将生物炭制备配置与提高Cd土壤修复效率相结合，将废弃生物质的利用与重金属的修复联系起来。这凸显了生物和碳基综合技术在应对全球环境挑战方面的潜力。

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Biochar immobilized Proteus mirabilis Ch8 to enhance the Cd phytoremediation potential of woody plant Robinia pseudoacacia L

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Biochar immobilized Proteus mirabilis Ch8 to enhance the Cd phytoremediation potential of woody plant Robinia pseudoacacia L

The resource-oriented utilization of agricultural solid wastes as biochar is eco-friendly and cost-effective, but the application of biochar for Cd-polluted soil remediation hindered by their efficiency and complicated field condition. This study used three types of raw materials i.e. oil tea (Camellia oleifera Abel) shell, reed straw, and urban sludge to prepare pyrolysis biochar. Meanwhile, a Cd highly resistant Proteus mirabilis Ch8 isolated from Robinia pseudoacacia L. rhizosphere was immobilized to form a biochar-bacteria composite for the remediation of Cd-polluted soil. The pyrolysis configurations and adsorption curves were studied and sludge biochar prepared at 700 °C was the most suitable for Cd adsorption which could be further accelerated to 79.97 mg g⁻¹ Cd adsorption concentration as sludge biochar-bacteria composite (CHB). After CHB treated the rhizosphere of R. pseudoacacia L. under Cd stress soil, it was shown that the CHB could synergistically (E-value > 0) enhance the Cd root enrichment level (BCF = 3.21), while soil Cd availability decreased by 78%, showing effective soil remediation potential. Further plant growth parameters indicated that plant biomass and photosynthesis level increased up to 2.25 and 2.34 folds compared to the untreated control. In addition, CHB largely improved the rhizosphere bacterial community diversity and functional species, with 13 types of rhizobia that might have N-fixing and growth promoting effects on plants. The study thoroughly explored how biochar interacts with microorganisms to improve Cd adsorption, enhance soil quality, and promote plant growth. By coupling biochar preparation configurations with enhanced Cd soil remediation efficiency, the study connects the utilization of waste biomass with the restoration of heavy metal. This highlights the potential of integrated biological and carbon-based technologies to address global environmental challenges.

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来源期刊

Journal of Environmental Management 环境科学-环境科学

CiteScore

13.70

自引率

5.70%

发文量

2477

审稿时长

84 days

期刊介绍： The Journal of Environmental Management is a journal for the publication of peer reviewed, original research for all aspects of management and the managed use of the environment, both natural and man-made.Critical review articles are also welcome; submission of these is strongly encouraged.