Uniform coating of TiO2 nanoparticles using biotemplates for photocatalytic wastewater treatment
Source abstract
Abstract
Abstract Immobilization of TiO2 particles over substrates like glass can facilitate the separation after photocatalytic runs. Photocatalytic activity of TiO2 coatings is related to its morphology, crystallography, optical properties and adherence of the coating. Biotemplates, including animal-based and herbal-based templates are inexpensive, biocompatible and abundant and can control the quality of TiO2 coating. In this study the effects of biotemplates such as agar, gelatin, and starch on the physiochemical properties of TiO2 coatings were investigated. Synthesized coatings were characterized by XRD, BET, FESEM, TEM, FTIR, EDX, and UV-Vis DRS analyses. The results showed that using biotemplates reduces the TiO2 crystallite size. Template-free TiO2 had 30 nm crystallite size, but using templates like agar decreased the size to 18 nm. Moreover, the addition of biotemplates decreased the thickness of TiO2 coatings compared to template free coating. And the use of biotemplates also limits the pore size distribution and increases BET surface area. According to EDX, TiO2 coating with agar indicated a uniform Ti distribution and crack-free homogenous morphology. TEM analysis of agar-templated TiO2 film showed a uniform morphology of TiO2 particles with average particle size of 20 nm. The UV-Vis DRS also confirmed a reduction in the band gap of TiO2 after the introduction of biotemplates. The study of the photocatalytic performance of samples showed that agar-templated TiO2 coating was able to remove 62.4% of methylene blue, while the coatings synthesized with gelatin and starch were just able to remove 42.77% and 35%, respectively. The TiO2 coating with agar was studied at different pH values and different initial methylene blue concentrations as well. The stability test of agar-templated TiO2 coating after four runs indicated just 5% of activity lost.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: TiO2 Photocatalysis and Solar Cells · Nanoparticles: synthesis and applications · Advanced Photocatalysis Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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