【摘要】 针对粉末状膨润土在水处理应用中存在固液难以分离的问题,进行了磁性膨润土新型吸附剂开发的研究.通过膨润土提纯、在二价和三价铁离子混合溶液中用氨水调节负载铁的氧化物及真空干燥等步骤,制备了一系列不同磁化率的磁性膨润土产品.对产品进行X衍射(XRD)、扫描电镜(SEM)及磁化率表征分析可知,膨润土表面负载的是四氧化三铁,其磁化率的大小随所负载铁含量的增加而增大.对水中微量氯乙酸和铅离子的吸附考察得知,磁性膨润土产品的吸附性能与原粉末状膨润土相当,但是对铅离子的吸附性能要比活性炭高得多.本文制得的磁性膨润土产品可以用磁分离技术非常容易地从溶液中分离出来,而且制备工艺简单,反应条件温和,在实际生产中具有广阔的应用前景.更多还原

【Abstract】 In view of the difficult separation of powder bentonite from solution in water treatment,the development of new type magnetic bentonite adsorbent was studied.A series of magnetic bentonite products with different magnetic susceptibilities were prepared through purifying bentonite,loading iron oxide in mixture solution of Fe2+ and Fe3+ by ammonia adjusting,and drying in vacuum.The X-ray diffraction(XRD),scanning electron microscopy(SEM),and magnetic susceptibility characterizing of the products show that Fe3O4 is loaded on bentonite surface and its magnetic susceptibility increases with the iron content increasing.The adsorption of chloroactic acid and lead ion in water on the magnetic bentonite was studied.The results show that the adsorption capability of magnetic bentonite is equal with powder original bentonite,and compared with active carbon,the adsorption capability of magnetic bentonite for lead ion is very high.The synthesized magnetic bentonite can be easily separated from solution with magnetic technology,and has simple preparation technology and moderate reaction conditions.更多还原