Sodium Dodecylbenzenesulphonate CAS 25155-30-0

Physical adsorption refers to a method of adsorbing SDBS on the surface of solid adsorbents under intermolecular interactions. The more commonly used adsorbents are mainly diatomaceous earth, activated carbon, kaolin and so on.

As a method of removing organic pollutants, physical adsorption is simple and easy to operate. However, this method uses a large amount of raw materials, relatively high cost, cumbersome process treatment, and large energy consumption for regeneration, and it is difficult to reuse the adsorbent. The problem of secondary pollution has not been completely solved, which limits its wide application.

Ultrasonic method refers to a method in which macromolecular pollutants in solution are decomposed into small molecular substances by the action of ultrasonic waves under suitable acid-base conditions. This technology is used to degrade SDBS, which is of great significance for purifying the environment.

Generally speaking, ultrasonic method is a relatively simple method, and SDBS degradation rate generally increases with the increase of ultrasonic power. However, using ultrasound alone to completely degrade organic pollutants generally consumes a lot of energy and has a long reaction period. In foreign countries, ultrasonic degradation of organic matter is generally used as an effective auxiliary degradation method, and is not used alone.

Microbial degradation is a commonly used degradation method at home and abroad. Its main mechanism is: in the presence of microorganisms, the alkyl chain on SDBS undergoes oxidation or sulfonation reaction, and decomposes into small molecules, so as to achieve the purpose of degradation. The microbial degradation method generally does not cause secondary pollution. At present, the degradation rate of SDBS by microorganisms is mainly improved by screening the most effective degrading bacteria.

Catalytic oxidation is generally divided into chemical reagent oxidation, photocatalytic oxidation and electrocatalytic oxidation.

1. Chemical reagent oxidation method
   SDBS is generally degraded by the use of catalysts and oxidants.
2. Photocatalytic oxidation method
   It is mainly to use light and catalysts to degrade SDBS. Photocatalytic oxidation is a method that has been studied more at present, mainly including photocatalytic oxidation of SDBS such as semiconductor materials and their composite materials, among which TiO2 and its composite materials are typical representatives. TiO2 photocatalytic oxidation surfactant has the advantages of non-toxicity, rapidity, wide application of substrates, complete mineralization, fixability, and no secondary pollution, and has attracted the attention of many researchers.
3. Electrocatalytic oxidation method
   It is mainly a method to degrade SDBS directly or indirectly through chemical reactions on electrodes. At present, the electrocatalytic oxidation method mainly focuses on the research of micro-electrolysis method. This method is simple to operate and requires low equipment, but the energy consumption is relatively large, so the research on it is still very limited.

The removal of SDBS by foam separation method refers to passing air into the foam containing SDBS, adsorbing SDBS on the surface of the bubble, and separating SDBS after concentration. The foam separation method is simple to operate and has been industrialized at present. Compared with other methods, the removal rate of SDBS by foam separation method is relatively low, only about 50%.

The sedimentation method is also a relatively mature sewage treatment method in industry, which is mainly divided into flocculation sedimentation method and coagulation sedimentation method. Flocculation refers to the addition of flocculants to water, which generally includes processes such as destabilization of colloidal particles, formation of flocs, mutual adsorption, and sedimentation and separation. Coagulation refers to adding a coagulant to water, which generally includes processes such as colloidal dispersion, destabilization, and coagulation.

Membrane separation refers to a method in which certain components in a solution are separated by a selectively permeable membrane. Generally speaking, the membrane treatment method has a higher removal rate of SDBS, but the membrane is easily polluted, and it is difficult to be used for the second time.