改性海泡石对水中余氯的去除性能研究

Study on Removal of Residual Chlorine from Water by Modified Sepiolite

为探索高效去除水中余氯的方法,以FeSO_(4)作为改性剂对海泡石进行改性处理,探究其最佳改性条件,并在最佳改性条件下探究不同吸附时间、pH值、余氯初始质量浓度对吸附效果的影响。结果表明,在改性剂质量分数为10%,pH值为6,吸附时间为24 h,初始余氯质量浓度为10 mg/L的条件下,FeSO_(4)改性海泡石对余氯的吸附效果最好,去除率达到91%。改性后的海泡石纤维聚集度增加,粗糙程度增加,孔隙增多,这种变化使改性海泡石表面反应点位增多、吸附能力增强。X射线衍射(XRD)分析显示,硫酸亚铁改性海泡石衍射图谱中未出现含铁结晶体的新特征峰,表明含铁晶体在改性过程中可能并未形成。

In order to explore the method of efficient removal of residual chlorine in water,FeSO_(4) is used to modify sepiolite,and the optimal modification conditions are explored.Under the optimal modification conditions,the influences of different adsorption time,pH and initial concentration of residual chlorine on the adsorption effect are explored.The results show that when modifier concentration is 10%,pH is 6.0,adsorption time is 24 h and residual chlorine concentration is 10 mg/L,FeSO_(4) modified sepiolite has the best adsorption effect on residual chlorine,and the removal rate reaches 91%.The fiber aggregation,roughness and porosity of the sepiolite increase,which leads to the increase of reaction points and adsorption capacity on the surface of the iron-modified sepiolite.XRD analysis shows that the new characteristic peak of Fe-containing crystals does not appear in the diffraction pattern of ferrous sulfate modified sepiolite,indicating that Fe-containing crystals may not be formed during the modification process.