粘土矿物改性生物炭同时固定重金属和减少土壤碳排放的机理。

IF 8 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Renjie Hou , Bingyu Zhu , Liuwei Wang , Shijun Gao , Rui Wang , Deyi Hou
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引用次数: 0

摘要

农田土壤重金属污染日益严重,多元素复合污染给人类生产生活带来巨大危害。寒冷地区的环境变化(如冻融循环和干湿交替)可能会增加重金属的潜在生理毒性,加剧污染风险。为了揭示海泡石改性生物炭在铅(Pb)、镉(Cd)和铬(Cr)污染土壤修复中的有效性,我们选择了在 500 和 800 °C 下热解的稻壳生物炭进行修复处理(分别称为 BC500 和 BC800)。同时,使用不同比例的海泡石进行改性(生物炭:海泡石=1:0.5 和 1:1),分别称为 MBC500/MBC800 和 HBC500/HBC800。结果表明,海泡石改性生物炭能有效提高重金属的固定化效果。在自然保存条件下,BC500、MBC500 和 HBC500 中的二乙烯三胺五乙酸(DTPA)可萃取铅的含量分别比 CK 降低了 5.95%、12.39% 和 13.55%。冻融循环和干湿交替激活了土壤中的重金属,而改性生物炭在老化条件下增加了吸附位点和含氧官能团,抑制了重金属的馏分转化。此外,冻融循环促进了土壤有机碳(SOC)的分解和矿化,而海泡石通过离子交换和吸附络合作用阻碍了活性碳的释放。其中,与 BC800 相比,HBC800 中的土壤溶解有机碳(DOC)含量降低了 49.39%。此外,与 BC500 相比,高温热解生物炭(BC800)提高了材料的孔隙度和碱度,有效抑制了重金属的迁移和转化,减少了土壤 DOC 的分解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mechanism of clay mineral modified biochar simultaneously immobilizes heavy metals and reduces soil carbon emissions

Mechanism of clay mineral modified biochar simultaneously immobilizes heavy metals and reduces soil carbon emissions

Mechanism of clay mineral modified biochar simultaneously immobilizes heavy metals and reduces soil carbon emissions

Heavy metal pollution in farmland soil has become increasingly severe, and multi-element composite pollution has brought enormous harm to human production and life. Environmental changes in cold regions (such as freeze-thaw cycles and dry-wet alternations) may increase the potential physiological toxicity of heavy metals and exacerbate pollution risks. In order to reveal the effectiveness of sepiolite modified biochar in the remediation of the soil contaminated with lead (Pb), cadmium (Cd), and chromium (Cr), the rice husk biochar pyrolyzed at 500 and 800 °C were selected for remediation treatment (denoted as BC500 and BC800). Meanwhile, different proportions of sepiolite were used for modification (biochar: sepiolite = 1: 0.5 and 1: 1), denoted as MBC500/MBC800 and HBC500/HBC800, respectively. The results showed that modified biochar with sepiolite can effectively improve the immobilization of heavy metals. Under natural conservation condition, the amount of diethylenetriaminepentaacetic acid (DTPA) extractable Pb in BC500, MBC500, and HBC500 decreased by 5.95, 12.39, and 13.55%, respectively, compared to CK. Freeze-thaw cycles and dry-wet alternations activated soil heavy metals, while modified biochar increased adsorption sites and oxygen-containing functional groups under aging conditions, inhibiting the fractions transformation of heavy metals. Furthermore, freeze-thaw cycles promoted the decomposition and mineralization of soil organic carbon (SOC), while sepiolite hindered the release of active carbon through ion exchange and adsorption complexation. Among them, and the soil dissolved organic carbon (DOC) content in HBC800 decreased by 49.39% compared to BC800. Additionally, the high-temperature pyrolyzed biochar (BC800) enhanced the porosity richness and alkalinity of material, which effectively inhibited the migration and transformation of heavy metals compared to BC500, and reduced the decomposition of soil DOC.

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来源期刊
Journal of Environmental Management
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.
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