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石英砂负载氧化铁吸附除磷的热动力学研究

Keywords: 负载型氧化铁,,吸附,动力学,热力学

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Abstract:

通过吸附动力学实验及等温吸附实验,考察了在10~40℃的温度条件下石英砂负载氧化铁(IOCS)吸附磷的热动力学性质。结果表明:准二级反应动力学模型及Langmuir等温吸附模型可分别较好地描述IOCS对磷的吸附动力学及吸附等温线实验结果(R2≥0.98);吸附速率及吸附容量随温度的增加而增加。吸附速率k从0.0095增加到0.0173,吸附容量从0.06mg/g增加到0.08mg/g。根据标准吉布斯自由能变(ΔG0<0)和标准反应焓变(ΔH0>0)值判断,IOCS对磷的吸附是自发的、吸热的化学吸附反应。

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