Full-spectrum response bismuth oxide/silver phosphate/carbon nanotube sponge composite photocatalyst for drilling waste liquid treatment and preparation method and application thereof

Abstract

The invention provides a full-spectrum response bismuth oxide / silver phosphate / carbon nanotube sponge composite photocatalyst for drilling waste liquid treatment and a preparation method and application thereof. The preparation method comprises the steps of adding carbon nanotube sponge into an organic alcohol-water solution of silver nitrate, adding a disodium hydrogen phosphate solution, carrying out a hydrothermal reaction process on the obtained mixed solution, carrying out filtering, washing and drying to obtain a silver phosphate / carbon nanotube sponge composite material, adding sodium bismuthate into a sodium hydroxide solution, then adding the silver phosphate / carbon nanotube sponge composite material, carrying out a hydrothermal reaction process and filtering, washing and freeze-drying to obtain the product. The bismuth oxide / silver phosphate / carbon nanotube sponge three-dimensional composite photocatalyst prepared by the method has the advantages of full-spectrum response, high photocatalytic activity, low photo-induced electron-hole recombination rate and high non-polar substance adsorption and degradation capacity. Under the irradiation of visible light and near-infrared light, the method is used for in-situ treatment on organic pollutants such as polycyclic aromatic hydrocarbon in the drilling waste liquid.

Description

technical field [0001] The invention relates to a full-spectrum response bismuth oxide / silver phosphate / carbon nanotube sponge composite photocatalyst for drilling waste fluid treatment, a preparation method and application thereof, and belongs to the field of drilling waste fluid treatment. Background technique [0002] With the increasing depth and difficulty of drilling, the types and amounts of chemical additives in drilling fluids are also increasing, resulting in a sharp increase in the difficulty of disposal of waste drilling fluids. In 2019, the number of drilling operations in my country will reach 19,500 wells, and at least 5 million tons of waste drilling fluid will be produced every year. During the drilling process, a large amount of oil-based lubricants are often added to improve the performance of the drilling fluid, or crude oil mixed into the drilling fluid when drilling into the oil layer will lead to a high content of polycyclic aromatic hydrocarbons in th...

AI Technical Summary

Problems solved by technology

However, the catalyst carrier is only based on one-dimensional carbon nanotubes, so there are problems such as low specific surface area and weak adsorption capacity for non-polar organic substances, which greatly restricts its photocatalytic efficiency.

At the same time, the catalysts obtained in the above methods cannot effectively absorb photons in the full spectrum range, have low photocatalytic activity, and do not have good dual effects of adsorption and degradation.

Images