CNT-Co/Bi2O3 catalyst photocatalytic synergistic activation of persulfate for efficient degradation of tetracycline
In the persulfate advanced oxidation process,the low regeneration efficiency of Co2+is the main problem of Co efficient activation of peroxymonosulfate(PMS).The photocatalyst of carbon nanotubes loaded with oxygen defect-rich bismuth oxide(x％CNT-Co/Bi2O3)was successfully prepared for photocatalytic synergistic persulfate activation and degradation of pollutants.When the initial pH is 4.68 and PMS concentration is 0.5 mmol/L,the degradation of tetracycline(TC)is up to 91.3％under UV light(λ=254 nm)irradiation with 20 mg/L 70％CNT-Co/Bi2O3 as catalyst.It has excellent reusability and stability.The improved degradation activity is attributed to the great specific surface area of carbon nanotubes which is favorable to the adsorption of TC.Besides,the photogenerated electrons accelerate the cycle rate of Co2+→Co3+→Co2+,which promotes the separation and migration of photogenerated charges and the activation of PMS,so that a rapid degradation of TC is realized.In addition,Bi2O3 is uniformly dispersed on the outer tube wall of CNT-Co,which avoids the agglomeration of Bi2O3 nanoparticles.CNT-Co has a large specific surface area,which is conducive to the adsorption of pollutants on the surface of the catalyst and increases the adsorption effect.The system produces a variety of active species,and its contribution is 1O2＞·SO4-＞·OH＞·O2-,which can realize the efficient degradation of pollutants by free radical and non-free radical.
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