Reactions of Hydrous Titanium Oxide Colloids with Strong Oxidizing Agents
Само за регистроване кориснике
1992
Чланак у часопису (Објављена верзија)
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The absorption spectra of the transients formed in the reactions of titanium hydrous oxide with SO4•-, Tl2+, or OH* species in alkaline aqueous solution have been studied by using the pulse radiolysis technique. Direct hole capture via interfacial electron transfer from colloidal titanium hydrous oxide to SO4•- radicals leads to the formation of a product which has the broad absorption spectrum with an onset at about 480 nm rising steeply toward the UV region. A completely different absorption spectrum was found for the hydroxyl radical adduct formed by the reaction of OH* with titanium hydrous oxide that has a maximum at 620 nm. This maximum disappears in acidic solution at pH 3 with assistance of H+aq which transforms the OH adduct to the product the same as that formed in the reaction with SO4•-. The low-weight aggregates of titanium hydroxide also react with OH* radicals, and in the alkaline solution a similar transient spectrum with a maximum at 570 nm was obtained. In neutral and... alkaline solutions the absorption spectra of transients formed in the reactions of OH*, Tl2+, or SO4•- with TiO2 do not appear to be dependent upon the mode of the colloid preparation. However, decay kinetics of these transients are very sensitive to surface chemistry.
Извор:
Langmuir, 1992, 8, 5, 1265-1270Институција/група
Institut za opštu i fizičku hemijuTY - JOUR AU - Rajh, Tijana AU - Šaponjić, Zoran AU - Micić, O. I. PY - 1992 UR - https://riofh.iofh.bg.ac.rs/handle/123456789/18 AB - The absorption spectra of the transients formed in the reactions of titanium hydrous oxide with SO4•-, Tl2+, or OH* species in alkaline aqueous solution have been studied by using the pulse radiolysis technique. Direct hole capture via interfacial electron transfer from colloidal titanium hydrous oxide to SO4•- radicals leads to the formation of a product which has the broad absorption spectrum with an onset at about 480 nm rising steeply toward the UV region. A completely different absorption spectrum was found for the hydroxyl radical adduct formed by the reaction of OH* with titanium hydrous oxide that has a maximum at 620 nm. This maximum disappears in acidic solution at pH 3 with assistance of H+aq which transforms the OH adduct to the product the same as that formed in the reaction with SO4•-. The low-weight aggregates of titanium hydroxide also react with OH* radicals, and in the alkaline solution a similar transient spectrum with a maximum at 570 nm was obtained. In neutral and alkaline solutions the absorption spectra of transients formed in the reactions of OH*, Tl2+, or SO4•- with TiO2 do not appear to be dependent upon the mode of the colloid preparation. However, decay kinetics of these transients are very sensitive to surface chemistry. T2 - Langmuir T1 - Reactions of Hydrous Titanium Oxide Colloids with Strong Oxidizing Agents EP - 1270 IS - 5 SP - 1265 VL - 8 DO - 10.1021/la00041a006 UR - conv_1335 ER -
@article{ author = "Rajh, Tijana and Šaponjić, Zoran and Micić, O. I.", year = "1992", abstract = "The absorption spectra of the transients formed in the reactions of titanium hydrous oxide with SO4•-, Tl2+, or OH* species in alkaline aqueous solution have been studied by using the pulse radiolysis technique. Direct hole capture via interfacial electron transfer from colloidal titanium hydrous oxide to SO4•- radicals leads to the formation of a product which has the broad absorption spectrum with an onset at about 480 nm rising steeply toward the UV region. A completely different absorption spectrum was found for the hydroxyl radical adduct formed by the reaction of OH* with titanium hydrous oxide that has a maximum at 620 nm. This maximum disappears in acidic solution at pH 3 with assistance of H+aq which transforms the OH adduct to the product the same as that formed in the reaction with SO4•-. The low-weight aggregates of titanium hydroxide also react with OH* radicals, and in the alkaline solution a similar transient spectrum with a maximum at 570 nm was obtained. In neutral and alkaline solutions the absorption spectra of transients formed in the reactions of OH*, Tl2+, or SO4•- with TiO2 do not appear to be dependent upon the mode of the colloid preparation. However, decay kinetics of these transients are very sensitive to surface chemistry.", journal = "Langmuir", title = "Reactions of Hydrous Titanium Oxide Colloids with Strong Oxidizing Agents", pages = "1270-1265", number = "5", volume = "8", doi = "10.1021/la00041a006", url = "conv_1335" }
Rajh, T., Šaponjić, Z.,& Micić, O. I.. (1992). Reactions of Hydrous Titanium Oxide Colloids with Strong Oxidizing Agents. in Langmuir, 8(5), 1265-1270. https://doi.org/10.1021/la00041a006 conv_1335
Rajh T, Šaponjić Z, Micić OI. Reactions of Hydrous Titanium Oxide Colloids with Strong Oxidizing Agents. in Langmuir. 1992;8(5):1265-1270. doi:10.1021/la00041a006 conv_1335 .
Rajh, Tijana, Šaponjić, Zoran, Micić, O. I., "Reactions of Hydrous Titanium Oxide Colloids with Strong Oxidizing Agents" in Langmuir, 8, no. 5 (1992):1265-1270, https://doi.org/10.1021/la00041a006 ., conv_1335 .