Experimental Study on the Adsorption of Heavy Metal Ions in Wastewater by Modified Bentonite
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摘要:
这是一篇陶瓷及复合材料领域的论文。为了研究改性膨润土对污水中重金属离子的吸附效果，分析pH值、初始浓度、时间、固液比、温度和粒径对膨润土吸附效果的影响，并采用微观手段研究在吸附重金属离子前后膨润土内部矿物成分的变化以及红外光谱图的变化规律。结果表明：当改性膨润土掺量为0.2 g、吸附时间为1.5 h、温度设置为40 ℃，pH值设定为6，初始浓度均设定为200 mg/L和固液比设置为0.8 g/L时，改性膨润土的吸附效果达到较佳。改性膨润土经过吸附实验后，可以检测到明显的CuSO4衍射峰，但是改性膨润土内部其他矿物成分不变，这说明改性膨润土可以有效地吸附污水中的铜离子。
Abstract:This is an article in the field of ceramics and composites. In order to study the adsorption effect of modified bentonite on heavy metal ions in sewage, the effects of pH value, initial concentration, time, solid-liquid ratio, temperature and particle size on the adsorption effect of bentonite were analyzed. And microscopic means were used to study the changes of the internal mineral composition of the bentonite before and after the adsorption of heavy metal ions and the change law of the infrared spectra. The results showed that when the modified bentonite content was 0.2 g, the adsorption time was 1.5 h, the temperature was set to 40 ℃, the pH value was set to 6, the initial concentration was set to 200 mg/L and the solid-to-liquid ratio was set to 0.8 g/L, the adsorption effect was the best. After the modified bentonite had undergone an adsorption test, an obvious CuSO4 diffraction peak could be detected. However, other mineral components inside the modified bentonite remained unchanged, which also showed that the modified bentonite could effectively adsorb copper ions in sewage.
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