Abstract
Methylene blue (MB) is a common pollutant in wastewater of printing and dyeing industry. At present, ozone oxidation is commonly used in the treatment of printing and dyeing wastewater. Ozone is used for oxidation reaction directly and indirectly. However, the reaction rate is not fast enough. In this study, the attapulgite (ATP) was modified by tetrabutyl titanate-ethanol solution. The TiO2/ATP nanocomposite with high catalytic activity was prepared. The synthesized samples were subjected to characterized by X-ray diffraction (XRD) and Fourier Transform infrared spectroscopy (FTIR). The morphology and particle size of the particles were observed by scanning electron microscopy (SEM). The TiO2/ATP nanocomposite was calcined at 300°C for 2 h, and the degradation rate of 80 mg/L methylene blue was 99.8%. The experimental results show that the ozone, temperature and mass transfer factors are excluded, and the effects of temperature, MB concentration and pH on the degradation of methylene blue are investigated. The optimal reaction conditions are as follows: The ozone concentration is 0.067 g/min; the ozone flow rate is 0.15 NL/min; the stirrer rotation speed is 550 r/min; the catalyst is 0.1 g; the temperature is 50°C; Based on the results, the reaction mechanism was derived and the kinetic study of the experiment was carried out.
Highlights
At present, the discharge of dye industry wastewater has reached 2 billion tons per year (Xue 2021)
The scanning electron microscopy (SEM) is employed to study the morphology of the attapulgite/ TiO2 composite materials
The experimental scheme is to impregnate the attapulgite with a volume of tetrabutyl titanate-ethanol solution
Summary
The discharge of dye industry wastewater has reached 2 billion tons per year (Xue 2021). ATP is a very good catalyst carrier, where TiO2 was loaded on as the active component can promote the conversion of ozone oxide into hydroxyl radical which can accelerates the decomposition of MB. The experimental set-up used in the experiment are a 4 flask with 250 ml volume, 101-1AB electric blast drying oven (Beijing Zhongxing Weiye Century Instrument Co., Ltd.) for drying sample, a constant temperature magnetic stirrer (Shanghai Lichen Bangxi Instrument Technology Co., Ltd.) for reaction, HY-010 type ozone generator (Chengdu Yifeng Hongyuan Environmental Protection Technology Co., Ltd.), I3 type UVvisible spectrophotometer (Jinan Haineng Instrument Co., Ltd.) for analysis sample concentration and OTL1200 type tube furnace for modifying catalyst with high temperature. The impregnated attapulgite was hydrolyzed in a water bath for 1 h, hydrolyzed to Ti(OH), dried in an oven and oxidized to TiO2, and dried for 3 h. Where D is the degradation rate (%), and A and A0 are the absorbance before and after degradation, respectively
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
