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Abstract
Using rectorite as raw material, REC is modified by nitric acid, TiO2 is attached to the surface of the acidized modified REC tablet to form modified REC-TiO2 composite materials by the sol-gel method, and its adsorption performance and photocatalytic properties were studied. The results show that the adsorption of REC, modified REC, modified REC-TiO2 composite materialtoporads to methylene blue increased with the increase of equilibrium concentration. The process of adsorption MB of modified REC-TiO2 composite materials is an endothermic process. The adsorption of REC, modified REC, modified REC-TiO2 composite materials to MB increased with the increase of temperature. When the temperature is 25 degree, the maximum adsorption capacity of REC is 93.985 mg/g, the maximum adsorption capacity of modified REC is 107.006 mg/g, and the maximum adsorption capacity of modified REC-TiO2 is 120.773 mg/g. The degradation rate of MB and p-nitrophenol by modified REC-TiO2 composite under illumination are 99% and 98%, respectively. The decontamination rate of MB and 4-NP of modified REC-TiO2 composites under darkness was 50% and 0.8%, respectively. Under light conditions, the degradation rate of MB and 4-NP in modified REC-TiO2 composite materials is improved.
Highlights
IntroductionThe REC and montmorillonite are deposited alternately as one layer
At present, the wanton discharge of agricultural and industrial wastewater has caused serious environmental pollution, which has aroused widespread concern of the society.The REC and montmorillonite are deposited alternately as one layer
As a promising semiconductor photocatalytic material, TiO2 is widely used in various fields due to its good biochemical characteristics, high catalytic activity and good oxidation performance, which is bound to lead the new direction of environmental protection industry
Summary
The REC and montmorillonite are deposited alternately as one layer. It itself is a good adsorbent, but the adsorption capacity is limited. It can be greatly improved by some chemical modification. It has a very wide application and good development prospects in environmental protection. As a promising semiconductor photocatalytic material, TiO2 is widely used in various fields due to its good biochemical characteristics, high catalytic activity and good oxidation performance , which is bound to lead the new direction of environmental protection industry. The modified rec composite can be prepared on the basis of acidification modified REC, so that the prepared composite has good adsorption performance and photocatalytic performance
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