Adsorption Performance of Modified Diatomite for Heavy Metal Ions in Wastewater
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摘要:
这是一篇矿业工程领域的论文。采用十二烷基磺酸钠和四氧化三铁对硅藻土进行改性，分析外部因素对吸附效果的影响，并开展改性硅藻土吸附重金属离子后物相成分变化以及微观结构变化的实验。结果表明：改性硅藻土掺量为4 g/L、吸附时间为40 min、温度设置为30 ℃，pH值设定为5，初始浓度均设定为200 mg/L时，改性硅藻土的吸附效果达到较佳。Freundlich模型对实验曲线的拟合度为0.90以上，而Langmuir模型对实验曲线的拟合度均在0.9以下，这就说明了Freundlich等温吸附模型更加适用于改性硅藻土吸附重金属铅离子吸附量的变化规律。改性硅藻土吸附铅离子前后的XRD图谱特征衍射峰并未有明显的差异，只是衍射峰的峰强度有所减小，但是改性硅藻土内部其他矿物成分却不变以及结构没有发生明显变化，这也说明了改性硅藻土可以有效地吸附污水中的铅离子，但是吸附过程基本属于物理吸附。
Abstract:This is an article in the field of mining engineering. The diatomite was modified with sodium dodecyl sulfonate and ferroferric oxide, and the influence of external factors on the adsorption effect was analyzed. And the experiment of the phase composition change and the microstructure change after the modified diatomite adsorbs heavy metal ions was carried out. The results show that when the modified diatomite content is 4 g/L, the adsorption time is 40 min, the temperature is set to 30 ℃, the pH value is set to 5, and the initial concentration is set to 200 mg/L, the adsorption of the modified diatomite is relatively good. The fitting degree of the Freundlich model to the test curve is above 0.90, and the fitting degree of the Langmuir model to the test curve is below 0.9, which shows that the Freundlich isotherm adsorption model is more suitable for the change law of the adsorption of heavy metal lead ions on modified diatomite. There is no significant difference in the characteristic diffraction peaks of the XRD pattern before and after the adsorption of lead ions on the modified diatomite. Only the peak intensity of the diffraction peak is reduced. However, the other mineral components inside the modified diatomite remain unchanged and the structure does not change significantly. This also shows that modified diatomaceous earth can effectively adsorb lead ions in sewage. However, the adsorption process is basically physical adsorption.
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