锰矿物对重金属的吸附及pH对锰矿物氧化Cr(Ⅲ)影响的机理

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土壤氧化锰矿物是土壤中的重要物质成份,除了作为动植物锰素的重要来源,还是土壤中的重要吸附载体、化学反应的接触催化剂和氧化还原反应的主体。虽然在土壤中的含量不高,但由于其电荷零点(PZC)低、比表面积大、负电荷量高、表面活性强,不仅对许多重金属元素有很强的吸附固定能力,还对许多变价元素有氧化能力,从而影响这些元素在环境中的有效性和毒性。对氧化锰矿物的吸附特性和氧化特性的研究,对了解土壤污染机理、土壤质量和生态环境之间的关系有重要的理论和实践意义。 本文采用等温吸附、化学平衡和
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