Investigation on the preparation of metakaolin-supported titanium mineral admixture with photocatalytic activity

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A new process for preparing metakaolin-supported titania with the feature of both photocatalytic and pozzolanic activity by so called single calcination method was investigated.The ground pyrite tailing was mixed with the titania sol by sol-gel method firstly and then calcining the mixture with the optimum calcination regime by which could turn the kaolin into metakaolin-supported titania which has both good pozzolanic activity and photocatalytic performance.The effect of metakaolin-supported titania mineral admixture's dosage,load time on the of cement slurry has been investigated.The results show that the optimum calcination regime was 750 ℃ for 2h;the optimum loading time was 2h;the optimum mineral admixture's dosage was 15%.The 7dpozzolanic activity index of the metakaolin-supported titania mineral admixture can reach up to 113%.The photocatalytic degradation efficiency on the MB of the admixture was high up to 93.5% with the initial concentration of the MB was 15mg/L.Micro-analysis was examined by XRD,ABS and TAM.The crystal form of titania supported on the metakaolin powder was anatase and had a good crystallinity.The metakaolin-supported titania mineral admixture fabricated by this method demonstrates both a good photocatalytic,self-cleaning effect and excellent pozzolanic activity while incorporating into cementitious materials.

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