Preparation of nano magnetic modified bentonite materials for reclamation of coking wastewater

In view of the difficult separation problem of powder bentonite from solution in water treatment, the development of new type magnetic bentonite composite materials was studied. The adsorption performance of natural bentonite was improved by organic modification. The bentonite was magnetic modified by nano Fe₃O₄ which was prepared by coprecipitation method. This magnetite composite materials which combined by bentonite and Fe₃O₄ not only has a better adsorptive capacity for COD and a better separate effect, but also has a simple preparation technology and reaction conditions. This composite materials have been characterized by powder X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The results revealed that interlamellar spacing of bentonite was increased through organic modification and Fe₃O₄ particles occured on the surface of bentonite particles and formed magnetic aggregation. These nano-magnetic modified materials with super performances would be used to treat coke wastewater.