| 硫化亚铁改性生物炭修复锑污染土壤及修复后稳定性评估 |
| 摘要点击 535 全文点击 70 投稿时间：2024-03-04 修订日期：2024-05-28 |
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| 中文关键词 锑（Sb） 生物炭 硫化亚铁 土壤修复 稳定机制 |
| 英文关键词 antimony（Sb） biochar ferrous sulfate soil remediation stability mechanism |
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| 中文摘要 |
| 为探究硫化亚铁改性生物炭（FeS-BC）对锑冶炼厂周边污染土壤的修复效果与机制,以贵州省晴隆县某废弃锑冶炼厂周边土壤为研究目标,通过土壤培养试验,对比研究了原始生物炭（BC）和硫化亚铁改性生物炭材料（FeS-BC）对土壤锑（Sb）浸出毒性、有效态含量和赋存形态的影响.结果表明,FeS∶BC质量比为1∶5、投加量为7%时对不同Sb污染程度土壤（G1~G6）中Sb的平均稳定效果最好,达到了66.85%；FeS-BC在较宽的pH范围内（2.0~10.0）均可保持较高的Sb稳定效率；在一定比例BC处理下,修复过程中不同Sb污染程度土壤（G1~G6）中Sb的浸出浓度和有效态含量有所波动,在修复60 d后分别降低了5.89%±3.04%（1.44%~9.08%）和20.49%±17.74%（4.83%~58.39%）,而FeS-BC在修复期内均能有效降低Sb浸出浓度和有效态含量,在修复60 d后分别降低了35.80%±13.80%（17.78%~55.05%）和34.84%±2.28%（31.60%~37.64%）；FeS-BC材料对土壤中Sb稳定机制包括：静电吸引、离子交换、氧化还原、络合作用和沉淀作用；BC和FeS-BC修复14 d后的不同Sb污染程度土壤（G1~G6）经干湿交替和冻融循环后,BC修复的土壤中Sb浸出液浓度和有效态含量均增加,存在一定释放风险,FeS-BC修复的土壤中Sb浸出液浓度增加而有效态含量降低. |
| 英文摘要 |
| To investigate the remediation effects and mechanisms of iron sulfide-modified biochar （FeS-BC） on polluted soil surrounding an antimony smelting plant, soil from around a decommissioned antimony smelting plant in the Qinglong County, Guizhou Province, was used as the research subject. Through soil cultivation experiments, the effects of raw biochar （BC） and iron sulfide-modified biochar （FeS-BC） on the leaching toxicity, bioavailability, and speciation of antimony （Sb） in the soil were compared. The results showed that with an FeS∶BC mass ratio of 1∶5 and an addition rate of 7%, the average stabilization efficiency of Sb in soils with varying degrees of Sb pollution （G1-G6） reached 66.85%. FeS-BC maintained high Sb stabilization efficiency across a wide pH range （2.0-10.0）. In soils treated with a certain proportion of BC, the leaching concentration and bioavailable content of Sb fluctuated during the remediation process, decreasing by 5.89%±3.04% （1.44%-9.08%） and 20.49%±17.74% （4.83%-58.39%）, respectively, after 60 days of remediation. In contrast, FeS-BC effectively reduced the leaching concentration and bioavailable content of Sb throughout the remediation period, with reductions of 35.80%±13.80% （17.78%-55.05%） and 34.84%±2.28% （31.60%-37.64%）, respectively, after 60 days of remediation. The stabilization mechanisms of Sb in soil by FeS-BC included electrostatic attraction, ion exchange, redox reactions, complexation, and precipitation. After 14 days of remediation with BC and FeS-BC, soils with varying Sb pollution levels （G1-G6） were subjected to alternating wet and dry conditions and freeze-thaw cycles. The leachate concentration and bioavailable content of Sb in soils remediated with BC increased, indicating a certain release risk. In contrast, in soils remediated with FeS-BC, while the leachate concentration of Sb increased, the bioavailable content decreased. |
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