以火山岩滤料为载体,制备了水合二氧化锰改性滤料用于去除矿井水的铁锰离子。在滤速为7.0 m/h,连续54 h的过滤周期内,改性火山岩对锰离子的去除率达94.8%～99.3%。结合X射线衍射(XRD),扫描电镜-能谱(SEM-EDS)等表征手段,确认火山岩改性后,表面覆盖的水合二氧化锰层具有丰富的表面羟基(以—Mn—OH表示),根据表面配合模式,其羟基中氢能与水中的Mn2+和Fe2+发生表面络合反应,最终Mn2+和Fe2+被表面羟基吸附并交换出氢,从而实现对铁锰离子的去除。

With the volcanic rocks filter material as the carriers, hydrated manganese dioxide modified filter material was prepared to the iron and manganese ion r emoval from the mine water.When the filtration speed was 7.0 m/h and during a continued 54 h filtration period, the manganese ion removal rate with modified volcanic rocks would be 94.8%99.3%.The X-ray diffraction, scanning electron microscopy-energy spectrum and other means combined verified that after the volcanic rocks modif ied, a hydrated manganese dioxide layer covered on the surface of the modified volcanic rocks would have rich surface hydroxyl (- -Mn一_OH) .According to the surface f itting mode, H in hydroxy| could have a surface complexation reaction with Mn2+ and Fe2+ in mine water, finally Mn2+ and Fe2+ could be absorbed by surface hydroxyl and the hydrogen could be replaced.Therefore, the removal of the iron and manganese ion could be realized.

国家高技术研究发展计划(863计划)资助项目(2008AA06Z305)；