Preparation method of corn straw biochar-Bi2WO6 photocatalyst for efficiently degrading organic pollutants

Abstract

The invention discloses a preparation method of a corn straw biochar-Bi2WO6 photocatalyst for efficiently degrading organic pollutants. The preparation method comprises the following steps: preparation of novel nitrogen-modified corn straw biochar N-Biochar: crushing corn straw into powder by using a crusher, then soaking 2 parts of straw powder into 1 part of a urea solution, carrying out dryingat 80 DEG C after soaking for 12 hours, and conducting roasting at 550 DEG C for 2 hours under a vacuum condition after drying; and preparation of the novel biochar-based photocatalyst Bi2WO6: dissolving 4 parts of sodium oleate into 40 parts of an ethylene glycol solution under heating, and then dissolving 4 parts of bismuth nitrate into the obtained mixed solution until the mixed solution is transparent. According to the invention, the corn straw is used for nitrogen modification to prepare novel g-C3N4-like nitrogen modified biochar and is coupled with the bismuth tungstate for the first time to prepare the novel biochar-based photocatalyst, and the photocatalyst has good visible light catalytic activity, and presents good photocatalytic degradation performance on rhodamine B dye and tetracycline hydrochloride pharmaceutical wastewater.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a corn stalk biochar and Bi 2 WO 6 Preparation method of photocatalyst. Background technique [0002] As we all know, my country is one of the countries with the richest straw resources, with an average annual crop straw output of 64 tons. With the increasing attention to issues such as resource regeneration and environmental pollution, straw burning has been strictly prohibited in my country, and how to dispose and reuse straw has become an urgent problem to be solved. As corn is the main crop in northern my country, the utilization of corn stalks as a resource has also become a challenge for my country to control air pollution and resource recycling. Except for a small part of the technology used to make animal feed and papermaking, most of the stalks are landfilled. , but due to the limitation of the cold weather in the north, the effect of returning straw to the field is not very o...

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Problems solved by technology

[0003] However, since the preparation and application of photocatalytically modified biochars are in their infancy, most of them are compounded with TiO2. The ability of modified biochars to be reported is less

However, in nature, 80% of sunlight is visible light. If the photocatalytically modified biochar has a weak response to visible light, it will not be able to generate free radicals under sunlight and cannot degrade pollutants in the environment. Limiting the application of photocatalytically modified biochar in environmental remediation

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