Cement Matrix Composition Impact on the Photocatalytic Performance of Immobilized TiO2 Particles over the Fixed Bed photoreactor for Denitrification of Water

Document Type : Original Research Paper

Authors

1 Faculty of Environment, University of Tehran, Tehran, Iran

2 Research Center of Health and Environment, Guilan University of Medical Sciences, Rasht, Iran

3 Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran

4 Department of Water and Environmental Engineering, Faculty of Civil Engineering, Shahrood University of Technology, Shahrood, Iran

5 Department of Civil Engineering, University of Guilan, Rasht, Iran

Abstract

Effective denitrification of water using photocatalytic reaction of active TiO2 particles doped with different oxides and metals has been the subject of numerous studies. For a particular research area, the potential of silica bond and its silicate based matrices with titanium dioxide and improving the photocatalytic performance using more economic methods is still challenging, and research in this field is attractive and ongoing. In this study, the effect of cement matrix and its complex bonds with industrial grade TiO2 particles was evaluated on the rate of water denitrification in a fixed bed circulating flow photoreactor. For this purpose, silica fume was substituted for cement in constant percent of 10 as a rich source of amorphous silica. Industrial grade TiO2 was added to the mix as5, 10 and 15 percent weight of cementitious materials (CM). Nano TiO2 was considered as a supplementary photocatalytic material with a constant 1% weight of CM in two mix designs. The results implied that the addition of 5% TiO2 increased the rate of nitrate concentration reduction by up to 10 times. Also, the specimen including 10% TiO2 increased denitrification rate by 107% compared to the previous content, which had much less impact. Also, the addition of nanoTiO2 increased denitrification rate up 113%.

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Main Subjects

References

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Pollution
Volume 9, Issue 4
October 2023
Pages 1295-1308

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