研究目的
to determine rational parameter of photocatalytic oxidation of anionic SAS (ASAS) in the aqueous medium by hydrogen peroxide in the reactor with immobilized titanium dioxide for achieving their maximum destruction.
研究成果
Conducted research showed that introduction into photocatalytic system of hydrogen peroxide substantially increases the rate and the degree of destruction of anionic SAS—sodium dodecylbenzenesulfonate in the reactor with titanium dioxide immobilized on a wide-porous ceramic block. The greatest acceleration of DBS destruction in the photocatalytic system H2O2/TiO2/UV was observed at the concentration of the oxidant 355 ± 15 mg/dm3. Titanium dioxide immobilized on a wide-porous ceramic carrier preserved its stable photocatalytic activity at oxidation of DBS solutions for a long time (61 h totally).
研究不足
The use of photocatalytic membrane reactors, immobilization of TiO2 nanoparticles on the granules of carrier–sorbents or in the form of a thin film on hard surfaces of various materials make it possible to eliminate drawbacks linked with the unstable nature of dispersion of TiO2 nanoparticles and the necessity of its separation after treatment of water for recycling in great measure prevents the use of the TiO2 suspension in processes of catalytic purification of water.
1：Experimental Design and Method Selection:
Photocatalytic oxidation of DBS solutions was carried out on a laboratory unit in a steel photocatalytic reactor fitted with a source of UV radiation, a peristaltic pump ensuring circulation of the solution from bottom to top, and a catalytic unit with the immobilized TiO
2：Immobilization of TiO2 on a wide-porous ceramics from aluminum oxide was performed by the sol-gel method followed by calcination. Sample Selection and Data Sources:
Sodium dodecylbenzenesulfonate (DBS) of the Acros Organics company was used as an object of research.
3：List of Experimental Equipment and Materials:
Steel photocatalytic reactor, UV radiation source (lamp DRB-8), peristaltic pump, wide-porous ceramic block with immobilized TiO2, Shimadzu UV-2450 spectrophotometer, Shimadzu TOC-VCSN analyzer, thermoreactor ECOS, photometer Orion A Q
4：Experimental Procedures and Operational Workflow:
40 Photocatalytic oxidation of DBS solutions was carried out at the initial temperature 15 ± 2°C for 4–8 hours without adding the oxidant and in the presence of various concentrations of hydrogen peroxide. The degree of destruction of DBS was assessed by the change of its concentration by A224, COD of the solution, and concentration of TOC.
5：Data Analysis Methods:
Absorption spectra of the DBS solutions were registered by a spectrophotometer. The TOC concentration was determined using an analyzer. The COD value was determined using a thermoreactor and a photometer. The concentration of H2O2 in DBS solutions was determined by the reaction with titanyl sulfate.
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