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

摘要：

随着服装行业的迅速发展，纺织工业中印染废水的总量与日俱增，对人类的健康造成严重的威胁。本文采用浸渍法制备负载铁和镧的改性凹凸棒土当作催化剂，以臭氧为氧化剂催化氧化含亚甲基蓝的印染废水，考察了不同催化剂用量、反应温度、亚甲基蓝初始浓度以及臭氧流量对亚甲基蓝降解率的影响。结果表明：当改性凹凸棒土用量为0.3g、臭氧流量为100mL/min、搅拌转速为500r/min、反应温度为45℃、反应时间为30min时，50mg/L亚甲基蓝废水的降解率就达到了96%左右；改性凹凸棒土表征结果表明Fe³⁺、La³⁺活性组分已经负载在凹凸棒土上，且负载效果较好。

关键词: 凹凸棒土, 稀土, 氧化, 废水, 动力学