Abstract
. The photocatalytic activity of three systems, promising for chemical water purification technologies, was experimentally compared, based on a combination of titanium dioxide/(Fe(II, III)), applying to the model oxidation reaction of methylorange organic dye in an aqueous medium. Herewith the cases of photocatalytic systems were investigated, which are based on: a) titania hydrosol obtained by hydrolysis of titanium isobutylate; b) a similar hydrosol with addition of Fe(III) ions; c) suspension of ilmenite powder based on FeTiO3. As a result of the investigation, the increase of the rate of destruction of methylorange by more than two times was found in the system with the introduction of a small amount of iron ions into initial suspension of the TiO2 hydrosol (at the obtaining a medium with the Fe3+ concentration up to 3.7 × 10–5 M). In the photocatalytic system, based on the suspension of pretreated (with suphation and calcination) ilmenite powder, enough high photocatalytic activity (the degree of methylorange decomposition up to 77 %) was measured but at a higher exposure than for the case of systems based on the TiO2 hydrosol. For the photocatalytic systems of the type being investigated, a possible mechanism of increasing their oxidative activity was briefly considered, which requires an additional physico-chemical analysis.
Highlights
A photocatalytic activity of three systems which are considered as rather promising for chemical water purification technologies has been experimentally compared the paper
A possible mechanism of increasing oxidative activity has been briefly considered for photo-catalytic systems of the type being investigated and it requires an additional physico-chemical analysis
2. В системе с введением в водную суспензию исходного гидрозоля TiO2 небольшого количества ионов железа (с получением среды с концентрацией Fe3+ не более 3,7 ∙ 10–5 М) выявлено существенное увеличение скорости фотохимической деструкции метилоранжа (более чем в два раза)
Summary
A photocatalytic activity of three systems which are considered as rather promising for chemical water purification technologies has been experimentally compared the paper. Устойчивого на протяжении года, был достигнут при концентрации диоксида титана, равной 1,0 ⋅ 10–2 моль на 1 л суспензии. Для изучения свойств был взят образец гидрозоля с концентрацией диоксида титана 1,0 ⋅ 10–2 моль/л, сохраняющий устойчивость на протяжении как минимум года со дня приготовления.
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