固定配比的钠化膨润土与土壤在不同pH条件下对 重金属离子的吸附效果研究

固定配比的钠化膨润土与土壤在不同pH条件下对重金属离子的吸附效果研究

摘要: 研究了固定配比的钠化膨润土与土壤在不同pH条件下对重金属离子的吸附效果。钠化膨润土与污染土壤按质量比1∶10和1∶20的比例混合,用碳酸氢铵-二乙三胺五乙酸(AB-DTPA)法提取土壤中有效态重金属。结果表明,在钠化膨润土与土壤质量比为1∶20的条件下,取得了最佳的修复效果;在pH=9.14时该混合土壤对重金属的总体吸附效果最佳。在实际土壤修复中,针对不同重金属污染,应灵活调整修复材料与污染土壤的配比和土壤的pH条件。

Abstract: The adsorption effects of heavy metals by reformed soils with fixed ratios of 1∶10 and 1∶20 of sodiummodified bentonite (SB) to local soil (LS) at different pH conditions were studied. Heavy metals in the soils were extracted using AB-DTPA method. The results showed that the adsorption effect for heavy metals by reformed soil with ratio of 1∶20 (SB/LS) was better than the reformed soil with 1∶10 (SB/LS). And the reformed soil with ratio of 1∶20 (SB/LS) and at pH=9.14 exhibited the best adsorption effect for heavy metals. The results also showed that in the actual soil remediation, the ratios of remediation materials to local soils and soil pH conditions should be flexible and adjustable for different heavy metal polluted soils.