关键词: 凹凸棒土, 稀土, 氧化, 废水, 动力学

Abstract:

With the rapid development of the garment industry, the total amount of printing and dyeing wastewater in the textile industry is increasing day by day, which poses a serious threat to human health. In this paper, the attapulgite clay which modified by iron and rare earth was prepared through impregnation method. With ozone (O₃) as oxidant, the catalyst was used to catalytic oxidation methylene blue(MB) in printing and dyeing wastewater. The effects of different catalyst dosage, reaction temperature, MB initial concentration and ozone flow rate on MB degradation rate were investigated. The results showed that when the dosage of modified attapulgite was 0.3g, ozone flow rate was 100mL/min, stirring speed was 500r/min, reaction temperature was 45℃, reaction time was 30min, the degradation rate of MB can be up to 96%; the characterization results of modified attapulgite clay showed that Fe³⁺ and La³⁺ had been loaded on attapulgite clay, and the loading effect was good.

Key words: attapulgity clay, rare earth, oxidation, waste water, kinetics