铁盐改性石英砂的制备及其吸附Cu^2＋性能研究

通过改变石英砂表面的物理化学性质,提高石英砂的吸附效率,考察其对废水中的Cu2＋去除效果。以石英砂为载体,分别用反复高温加热法和反复碱性沉积法制备三氯化铁改性砂、硝酸铁改性砂,测定了2种方法制备的铁盐改性砂的表面含铁量、铁盐的酸稳定性及比表面积,并比较了2种铁盐改性砂对Cu2＋吸附效果。结果表明,三氯化铁改性砂、硝酸铁改性砂的比表面积分别为2.468 m2/g和4.247 m2/g,比石英原砂比表面积分别提高了6.910和12.612倍;在pH=6条件下,石英砂对Cu2＋去除率为39%左右,硝酸铁改性砂对Cu2＋去除率达到84%,氯化铁改性砂达到89%以上,铁盐改性砂对Cu2＋去除能力比原砂有很大的提高;铁盐改性砂对Cu2＋的吸附有一定的容量,表面的活性中心越多,吸附能力越大。

EXPERIMENTAL STUDY ON PREPARATION AND CU2+ ADSORPTION CAPABILITY OF FERRIC SALT MODIFIED SANDS

Ferric salt modified was prepared with quartz sand as a carrier and ferric salt coating by the two methods of repeat high-temperature process and repeat alkaline deposition process.The iron content,acid stability,specific surface area of two ferric salt modified sands were detected,and their Cu2 ＋ adsorption capability in the different conditions were also described in this paper.the results showed that the specific surface area of ferric chloride and ferric nitrate modified sand was 2.468m2/g and 4.247m2/g respectively,which was 6.910 and 12.612 times more than that of raw quartz sand.The larger specific surface area correlated higher Cu2＋removal efficiency.In the condition of pH with 6.00,the removal efficiency of Cu2＋ by raw quartz sands was approximately 39 %,in contrast,the removal efficiency reached 84 % by ferric nitrate modified sand and over 89 % by ferric chloride modified sand,it was much higher than that of raw quartz sand.The adsorption capability of ferric salt modified sand for Cu2＋ was influenced by many factors.The more the surface active centers are,the higher the adsorption capability is.