Photoredox reactions of environmental chromium
The role of direct photochemical reactions of Cr(VI) and Cr(III) species in the environmental degradation of organic matter was investigated by means of Cr(VI)/alcohol and Cr(III)/EDTA model systems under conditions mimicking the environmental ones. Photoreduction of Cr(VI) proceeds through reductiv...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2001-01-01
|
| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X0100023X |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832546514803621888 |
|---|---|
| author | Piotr Mytych Paweł Cieśla Zofia Stasicka |
| author_facet | Piotr Mytych Paweł Cieśla Zofia Stasicka |
| author_sort | Piotr Mytych |
| collection | DOAJ |
| description | The role of direct photochemical reactions of Cr(VI) and Cr(III) species in the environmental
degradation of organic matter was investigated by means of Cr(VI)/alcohol and Cr(III)/EDTA model systems
under conditions mimicking the environmental ones. Photoreduction of Cr(VI) proceeds through reductive
quenching of chromate(VI) excited within UV-A by an alcohol molecule. Although HCrO4− is more susceptible to the quenching than the CrO42− ion, and oxygen favours the reverse reaction, the reduction can be easy noticeable at air-saturated natural waters. Photoredox behaviour of [crEDTA(L)]n- is more complex: it is initiated also by photoreduction, Cr(III) hv→ Cr(II), which at alkaline medium and a large excess of O2 over Cr(II) is followed by the Cr(II) → Cr(VI) oxidation. Both the photoreductions are accompanied by oxidation
of organic matter. Due to the substitutional lability of the [crEDTA(L)]n- complexes the conditions can be
adjusted under which the Cr(VI)/Cr(III) forms are able to mediate the O2 oxidation of organic matter in the
environmental photocatalytic cycle. |
| format | Article |
| id | doaj-art-28f88b4bd93e40b284ccf01264ecb010 |
| institution | Kabale University |
| issn | 1110-662X |
| language | English |
| publishDate | 2001-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-28f88b4bd93e40b284ccf01264ecb0102025-02-03T06:48:38ZengWileyInternational Journal of Photoenergy1110-662X2001-01-013418118610.1155/S1110662X0100023XPhotoredox reactions of environmental chromiumPiotr Mytych0Paweł Cieśla1Zofia Stasicka2Faculty of Chemistry, Jagiellonian University, Ingardena 3, Kraków 30-060, PolandFaculty of Chemistry, Jagiellonian University, Ingardena 3, Kraków 30-060, PolandFaculty of Chemistry, Jagiellonian University, Ingardena 3, Kraków 30-060, PolandThe role of direct photochemical reactions of Cr(VI) and Cr(III) species in the environmental degradation of organic matter was investigated by means of Cr(VI)/alcohol and Cr(III)/EDTA model systems under conditions mimicking the environmental ones. Photoreduction of Cr(VI) proceeds through reductive quenching of chromate(VI) excited within UV-A by an alcohol molecule. Although HCrO4− is more susceptible to the quenching than the CrO42− ion, and oxygen favours the reverse reaction, the reduction can be easy noticeable at air-saturated natural waters. Photoredox behaviour of [crEDTA(L)]n- is more complex: it is initiated also by photoreduction, Cr(III) hv→ Cr(II), which at alkaline medium and a large excess of O2 over Cr(II) is followed by the Cr(II) → Cr(VI) oxidation. Both the photoreductions are accompanied by oxidation of organic matter. Due to the substitutional lability of the [crEDTA(L)]n- complexes the conditions can be adjusted under which the Cr(VI)/Cr(III) forms are able to mediate the O2 oxidation of organic matter in the environmental photocatalytic cycle.http://dx.doi.org/10.1155/S1110662X0100023X |
| spellingShingle | Piotr Mytych Paweł Cieśla Zofia Stasicka Photoredox reactions of environmental chromium International Journal of Photoenergy |
| title | Photoredox reactions of environmental chromium |
| title_full | Photoredox reactions of environmental chromium |
| title_fullStr | Photoredox reactions of environmental chromium |
| title_full_unstemmed | Photoredox reactions of environmental chromium |
| title_short | Photoredox reactions of environmental chromium |
| title_sort | photoredox reactions of environmental chromium |
| url | http://dx.doi.org/10.1155/S1110662X0100023X |
| work_keys_str_mv | AT piotrmytych photoredoxreactionsofenvironmentalchromium AT pawełciesla photoredoxreactionsofenvironmentalchromium AT zofiastasicka photoredoxreactionsofenvironmentalchromium |