Preparation And Properties Of Carbon-Magnetic Composite Particles As Dye Wastewater And Oily Wastewater Treatment Agent

Magnetic composite materials not only have the features of original materials, but also can overcome the defects of original materials and show synergistic effect. So their comprehensive performance is better than that of original materials, and can meet the practical requirements. In recent years, magnetic composite materials have had great development in many fields such as electromagnetic shielding, sensor technology, magnetic separation, drug-induced and radar absorbing materials. So their research and application received worldwide attention.Expanded graphite and carbon nanotubes which have unique pore structure, large specific surface area, strong adsorption performance and stable chemical properties are a kind of ideal adsorption material, especially for disposing of organic wastewater. However, due to their lightweight, drift, and difficulty to recovery, they are not worth to being wastewater treatment agent. The Zn-Ti ferrite (ZnTixFe2-x04) with the excellent magnetic and photocatalytic properties is considered as a new kind of potential solar energy conversion materials. So, if the Zn-Ti ferrite is dopped into the expanded graphite or carbon nanotubes, the carbon-magnetic composite particles not only have strong adsorption capacity and high photocatalytic activity, but also can be recovered easily and reused conveniently. Based on the above idea, the main research contents and results of this paper are as follows:ZnTixFe2-xO4(ZTxF2-x) was prepared by chemical co-precipitation method. The composition, microstructure, magnetic property and photocatalytic activity of the samples were characterized by means of modern analytical techniques. The results indicate that Ti elements have been dopped into the ZnFe2O4lattice, and the ZTxF2-x presents the single spinel structure. The photocatalytic properties varies with the different Ti content in ZTxF2-x. And the photocatalytic properties of ZT0.6F1.4(x=0.6) is optimal. More important, the ZT0.6F1.4in the wastewater can be recovered conveniently by magnet, and activated simply and reused easily.The carbon-magnetic composite particles (ZT0.6F1.4/EG and ZT0.6F1.4/MWNTs) were prepared by chemical co-precipitation method. The composition, microstructure, magnetic property, photocatalytic activity, and adsorption property of the samples were characterized by means of modern analytical techniques. The results indicate that the carbon-magnetic composite particles not only hold the original special structure and good adsorption properties of EG (MWNTs), but also have nice loading factor for ZT0.6F1.4, excellent magnetic property and photocatalytic activity. The removal rate of the samples on rhodamine B depends on two factors, the first and important one is the adsorption of EG (MWNTs), and the another one is the photocatalytic degradation of ZT0.6F1.4in the carbon-magnetic composite particles. The maximum adsorption amount (qm) of ZT06F1.4/EG (mzTF/mEG=1:1) and ZT0.6F1.4/MWNTs (MZTF/mMWNTs=1:1) is up to5.102mg-g-1and17.153mg-g-1for rhodamine B, respectively. Their adsorption behavior on rhodamine B is in accord with Langmuir model. Moreover, the carbon-magnetic composite particles have good adsorption effect on industrial dye wastewater and oil-water solution. In addition, the samples can be recovered conveniently, activated easily and has good performance for recycling.