煤矸石制备水处理吸附剂的实验研究

Experimental Study on Preparation of Water Treatment Adsorbent from Coal Gangue

摘要: 利用煤矸石对其进行改性处理制备一种吸附剂，以土霉素为吸附研究对象，研究溶液pH、振荡时间、吸附剂投加量、土霉素初始浓度和温度等因素对吸附效果的影响，同时还探究了土霉素吸附过程中的吸附等温线。实验结果表明：煤矸石与MgSO₄质量比为1:0.5，活化温度550℃，活化时间1 h时制备的改性煤矸石吸附效果最好。在此条件下制备的吸附剂其最佳吸附条件：硫酸镁改性煤矸石投加量为2.5 g/L、吸附时间为1.5 h，溶液初始浓度为10 mg/L、溶液pH为4，温度为55℃，吸附率可达96.99%，并且最大吸附量为2.17 mg/g，同时吸附过程中的吸附等温线符合Freundlich吸附等温模型。

Abstract: An adsorbent was prepared by modifying coal gangue. With oxytetracycline as the adsorption re-search object, the influence of solution pH, oscillation time, adsorbent dose, initial concentration and temperature on the adsorption effect was studied, and the adsorption isotherm of oxytetracyclin adsorption was also explored. The experimental results show that the mass ratio of gangue to Magnesium sulfate is 1:0.5, the activation temperature is 550˚C, and the modified gangue adsorption effect is best at 1 h. The optimal adsorption conditions of the adsorbent prepared under this condition: the addition amount of magnesium sulfate modified coal gangue is 2.5 g/L, the adsorption time is 1.5 h, the initial solution concentration is 10 mg/L, the solution pH is 4, the temperature is 55˚C, the adsorption rate can reach 96.99%, and the maximum adsorption amount is 2.17 mg/g. Meanwhile, the adsorption isotherm in the adsorption process meets the Freundlich adsorption isothermal model.