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Abstract

Fixed beds were adopted for removal of organic dye from water by photocatalytic decomposition or adsorption. To this end, macroporous titania or silica micro-particles were synthesized from emulsions as micro-reactors and packed in the bed. During feeding aqueous methylene blue solution, UV light was irradiated for generation of active radicals for removal of dye by photocatalytic decomposition. Porous silica particles were also used as adsorbents in the bed for continuous adsorption of organic dye. For regeneration of the porous titania or silica particles, rinsing with fresh water was carried out before repeated cycles.
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Authors and Affiliations

Young-Sang Cho
1
ORCID: ORCID
Sohyeon Sung
1
ORCID: ORCID

  1. Tech University of Korea, Department of Chemical Engineering and Biotechnology, 15073, 237 Sangidaehak-ro, Siheung-si, Korea
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Abstract

Iron oxide nanoparticles were incorporated to form composite microspheres of SiO2 and Fe2O3 for magnetic separation of the particles after adsorption or photochemical decomposition. Economic material, sodium silicate, was purified by ion exchange to prepare aqueous silicic acid solution, followed by mixing with iron oxide nanoparticles. Resulting aqueous dispersion was emulsified, and composite microspheres of SiO2 and Fe2O3 was formed from the emulsion droplets as micro-reactors during heating. Removal of methylene blue using the composite microspheres was performed by batch adsorption process. Synthesis of composite microspheres of silica containing Fe2O3 and TiO2 nanoparticles was also possible, the particles could be separated using magnets efficiently after removal of organic dye.
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Bibliography

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[5] E . Colombo, M. Ashokkumar, RSC Adv. 7, 48222-48229 (2017).
[6] M. Schneider, T. Ballweg, L. Groß, C. Gellermann, A. Sanchez‐ Sanchez, V. Fierro, A. Celzard, K. Mandel, Part. Part. Syst. Charact. 36 (6) 1800537-, (2019).
[7] M. Farahmandjou, F. Soflaee, Phys. Chem. Res. 3 (3), 193-198 (2015).
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Authors and Affiliations

Young-Sang Cho
1
ORCID: ORCID
Sohyeon Sung
1
ORCID: ORCID

  1. Korea Polytechnic University, Department of Chemical Engineering and Biotechnology, 237 Sangidaehak-ro, Siheung-si, Gyeonggi 15073, Korea

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