A Study On Preparation And Adsorptive Property Of Attapulgite Composites

The disposal of dyeing effluent receives the widespread attention with the aggravation of water environment in our country. The dyeing industry is a main source of the industrial waste emissions because the component of the wastewater is complex and it is high in organic content, chromaticity and alkalinity as well as the anti-oxidation and anti-biodegradation, which becomes one of the difficult industrial wastewater to process. At present, the disposal method of dyeing wastewater can be mainly divided into biochemistry, flocculation method and activated carbon absorption and combination of above methods. But the cost of activated carbon absorption is high and the regenerative process is complicated that limits this method to wide applications. The attapulgite (ATP) is a crystalline mineral of magnesium silicate containing rich water with unique layer structure, unusual colloid property and the powerful adsorptive capacity. Recent years, the attapulgite was discovered in Linze, Huining county of Gansu province and the total amounts were estimated to above 1 billions tons. Especially, the discovery of attapulgite clay in Linze has enriched the attapulgite type and has expanded its applications in various fields. Therefore, in present study the attapulgite of Linze was selected to prepare its composites with nanometer ZnO and aorganic compounds were studied by adsorbing the dye.This thesis was mainly composed of following three aspects:1. The nanometer ZnO particles were loaded on the surface of ATP, resulting in nanometer ZnO/ATP composite material by chemical precipitation method using ZnSO4 and (NH4)2SO4 as start materials and its adsorption properties were studied by adsorbing the methylene blue in aqueous solution.2. Surface organic modification of ATP was conduced under the ultrasonic condition and the adsorption performance of prepared composite material was studied by absorbing the Rhodamine B.Moreover, though there are numerous reports on the environmental applications of nanometer TiO2 photocatalyst, the photocatalytic degradation of pollutants occurred mostly in gas-solid and liquid-solid interface and there are few of investigative concerning the solid phase photocatalytic reaction. Therefore, in this paper, we prepared a series of La3+ doped TiO2 photocatalysts with different La3+ doping amounts using the acid-catalyzed sol-gel method, and their photocatalytic activity were studied by degrading the PVC thin under UV light illumination.