镁盐改性石英砂制备及其吸附Cd^(2+)性能  

Study on the preparation and adsorption capability concerning Cd^(2+) of magnesium salt modified sand

作　　者：丁春生[1] 曾海明[1] 付静[1] 黄燕[1] 彭芳[1] 徐召燃[1] 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310032

出　　处：《兰州大学学报（自然科学版）》2011年第2期122-125,共4页Journal of Lanzhou University(Natural Sciences)

基　　金：浙江省科技计划项目(2007C33056)

摘　　要：以石英砂为载体,用碱性沉积法制备了镁盐改性砂.考察了改性前后石英砂比表面积的变化情况,研究了在静态试验条件下,镁盐改性砂对镉的吸附性能及其影响因素.结果表明:镁盐改性砂表面涂层为Mg(OH)2,比表面积为49.127m2/g,是石英原砂的6.12倍;在pH值为中性的条件下,镁盐改性砂的吸附效果优于石英原砂,石英原砂对Cd2+去除率为39%,镁盐改性砂对Cd2+去除率可达到47%;随着Cd2+初始浓度的增大,镁盐改性砂对Cd2+的去除率逐渐减少,且随着pH值的升高而提高,当pH值为9.0时,去除率达到67%.In this experiment quartz sand was chosen as a carrier coated with magnesium salt through the deposition process at alkaline condition,and then the specific surface area was investigated.The adsorption capability and influencing factors for cadmium removal by magnesium salt modified sand were studied respectively.The experimental results showed that the surface coating was Mg（OH） 2 and the specific surface area of aluminous salt modified sand was 49.127 m 2 /g,which was 6.12 times that of raw quartz sand.The adsorption capability of magnesium salt modified sand was significantly improved,and the removal efficiency of Cd ^2＋ by magnesium salt modified sand was much better than that for raw quartz sand under the condition of pH value with 7.00.And the removal of Cd ^2＋ for raw quartz sand was approximately 39%;in contrast,the removal efficiency reached 47% for magnesium salt modified sand.It was also found that the removal of Cd ^2＋ by the magnesium salt modified sand was reduced with the increase of an initial concentration of Cd ^2＋,and was enhanced with the increase of pH value,with the Cd ^2＋ removal rate being almost 67% under the pH condition of 9.0.

关 键 词：镁盐改性砂 除镉 吸附性能 

分 类 号：X703[环境科学与工程—环境工程]