DEGRADATION OF SODIUM DODECYL BENZENE SULFONATE BY REUSED TiO_2-BENTONITE

Difference of sodium dodecyl benzene sulfonate(SDBS) was degradated by 0.5% TiO2-bentonite and 0.5% reused TiO2-bentonite separately under 6 w ultraviolet lamp within 6h was compared.Original concentration of SDBS was 20 mg/L and the cause of difference was discussed.The results showed that:(1) Reduction of SDBS in solution which was treated by the TiO2-bentonite and by the reused TiO2-bentonite was 86.3% and 46.2% separately.Although the efficiency of reduction of SDBS treated by reused TiO2-bentonite was lower,the result showed that TiO2-bentonite can be reused.(2) Compared with the lattice structure of TiO2-bentonite,the lattice structure of reused TiO2-bentonite was not changed obviously.(3)Compare with the efficiency of SDBS reduced by TiO2-bentonite,its inefficient t reduced by reused TiO2-bentonite was that some of Ti in reused TiO2-bentonite was washed out when TiO2-bentonite was first used.(4) Contents of organic matter of reused TiO2-bentonite were higher remarkably than those of TiO2-bentonite.The longer time ultraviolet lamp shine,the lower contents of organic matter of reused TiO2-bentonite.SDBS was absorbed by TiO2-bentonite first,and then was degradated.(5) Concentration of SO42-in solution was higher when TiO2-bentonite was reused than that when TiO2-bentonite was first used.SO42-came mainly from degradation of SDBS.