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TiO2@lipophilic Porphyrin Composites: New Insights into Tuning the Photoreduction of Cr(VI) to Cr(III) in Aqueous Phase
- Source :
- Journal of Composites Science, Vol 4, Iss 82, p 82 (2020), Journal of Composites Science; Volume 4; Issue 2; Pages: 82
- Publication Year :
- 2020
- Publisher :
- MDPI AG, 2020.
-
Abstract
- Metal-free and Cu(II)-lipophilic porphyrins [H2Pp and Cu(II)Pp] loaded on titanium dioxide in the anatase phase (TiO2) were prepared and used as a heterogeneous catalyst for the photoreduction of Cr(VI) to Cr(III) in aqueous suspensions under UV–Vis light irradiation. TiO2 impregnated with copper(II) porphyrin [TiO2@Cu(II)Pp] was the most effective in photocatalyst reduction of toxic chromate Cr(VI) to non-toxic chromium Cr(III). We further evaluated an experimental design with the scope of fast optimization of the process conditions related to the use of TiO2 or TiO2-porphyrin based photocatalysts. A full factorial design as a chemometric tool was successfully employed for screening the affecting factors involved in photoconversion catalysis, with the modification of TiO2 both with porphyrin H2Pp and Cu(II)Pp. The studied experimental factors were the catalyst amount, the concentration of Cr(VI) ions, and the pH of the medium. The performed multivariate approach was successfully used for fast fitting and better evaluation of significant factors affecting the experimental responses, with the advantage of reducing the number of available experiments. Thus, the stability of the optimized TiO2 embedded Cu(II)Pp was investigated, confirming the high reproducibility and suitability for environmental purposes.
- Subjects :
- experimental design
chemistry.chemical_element
02 engineering and technology
photocatalytical reduction
010402 general chemistry
Heterogeneous catalysis
01 natural sciences
lcsh:Technology
Catalysis
Porphyrin
chemistry.chemical_compound
Chromium
lcsh:Science
Engineering (miscellaneous)
Aqueous solution
titanium dioxide
catalyst
porphyrin
Cr(VI) ions
Chromate conversion coating
lcsh:T
021001 nanoscience & nanotechnology
Experimental design
0104 chemical sciences
chemistry
Titanium dioxide
Cr(VI) ion
Ceramics and Composites
Photocatalysis
lcsh:Q
Catalyst
0210 nano-technology
Photocatalytical reduction
Nuclear chemistry
Subjects
Details
- Language :
- English
- Volume :
- 4
- Issue :
- 82
- Database :
- OpenAIRE
- Journal :
- Journal of Composites Science
- Accession number :
- edsair.doi.dedup.....837cf19a9fd32382f4b5aa6d2da31b60