Process for carrying out photocatalytic oxidation treatment on dimethyl sulfoxide-containing wastewater through photosensitizer under visible light

Abstract

The invention belongs to the technical field of water pollutant purification treatment. The invention relates to a photocatalytic oxidation treatment process for dimethyl sulfoxide-containing wastewater, in particular to a photocatalytic oxidation treatment process for dimethyl sulfoxide-containing wastewater through a photosensitizer under visible light. A photosensitizer and hydrogen peroxide are used for treating a water body containing dimethyl sulfoxide under irradiation of visible light, wherein the photosensitizer comprises rose bengal, rhodamine, methylene blue, nuclear solid red and spiro[fluorene-9,9'-xanthene], and the mass ratio of the photosensitizer to dimethyl sulfoxide in the water body is (0.5-1):100. These photosensitizers generate initiation free radicals after absorbingvisible light, and the generated initiation free radicals can be exchanged with hydrogen peroxide, so that the hydrogen peroxide is decomposed into oxidation free radicals to react with dimethyl sulfoxide.

Description

technical field [0001] The invention belongs to the technical field of purification and treatment of water pollutants, and in particular relates to a photocatalytic oxidation treatment process for wastewater containing dimethyl sulfoxide through a photosensitizer under visible light. Background technique [0002] Dimethyl sulfoxide (DMSO) is a sulfur-containing polar aprotic organic solvent, which can be miscible with most organic solvents such as ethanol, toluene, chloroform and water in any ratio, and has good solubility, high boiling point, non-toxic And other characteristics, are widely used in petrochemical, man-made fibers, printing and dyeing, pharmaceutical synthesis and other industries. Although dimethyl sulfoxide is non-toxic, it can bring dissolved toxic substances into water bodies and organisms, causing poisoning. Therefore, even if dimethyl sulfoxide exists in small amounts in water bodies, it still needs to be separated from water bodies. [0003] The bioche...

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Problems solved by technology

Although dimethyl sulfoxide is non-toxic, it can bring dissolved toxic substances into water bodies and organisms, causing poisoning, so even if dimethyl sulfoxide exists in small amounts in water bodies, it still needs to be separated from water bodies

[0003] The biochemical treatment of dimethyl sulfoxide is difficult. The wastewater produced by the process of using dimethyl sulfoxide as a raw material or auxiliary material often has high chemical oxygen demand (COD) and poor biodegradability. Biochemical treatment is easy to degrade it into dimethyl sulfide Odor and highly toxic compounds such as ether, methyl mercaptan, and hydrogen sulfide can easily cause secondary pollution

[0007] However, the ultraviolet light / hydrogen peroxide advanced oxidation process of dimethyl sulfoxide wastewater has not been widely used. At its root, the ultraviolet light / hydrogen peroxide advanced oxidation process of dimethyl sulfoxide wastewater has two major defects: one is the generation device of ultraviolet light , this type of device often has high energy consumption, the effective ultraviolet band in the spectrum is not strong enough, and most of the wavelengths in the light are not within the absorption wavelength range of hydrogen peroxide, so that a lot of energy in the light is wasted and the efficiency is reduced. Light requirements, experimental studies have shown that hydrogen peroxide will be decomposed into HO and HO in large quantities under UV-B and UV-C ultraviolet light 2 High oxidation activity free radicals, but glass containers made of quartz glass materials that are difficult to process and expensive are required to allow UV-B and UV-C bands to pass through, making equipment processing an insurmountable threshold for this process

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