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Absorption spectra of silica–titania xerogels after the interaction with 1 × 10−4 M triphenylmethane dyes solution. PV—pyrocatechol violet (pH 7.3), ECR—eriochrome cyanine R (pH 2.0), CAS—chrome azurol S (pH 3.0). m/V = 0.10 g/5.0 mL, time of contact is 20 min.
