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The kinetics of the interaction of silica–titania xerogels with 1 × 10−4 M triphenylmethane dyes solution: (a) dependence of xerogel absorbance on time; (b) dependence of conversion on time. PV—pyrocatechol violet (λ 640 nm, pH 7.3); ECR—eriochrome cyanine R (λ 570 nm, pH 2.0); CAS—chrome azurol S (λ 550 nm, pH 3.0). m/V = 0.10 g/5.0 mL.
