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. 2018 Mar 15;18(3):864. doi: 10.3390/s18030864

Figure 2.

Figure 2

The effect of pH on silica–titania xerogels absorbance after the interaction with 1 × 10−4 M triphenylmethane dyes solution. PV—pyrocatechol violet (λ 640 nm), ECR—eriochrome cyanine R (λ 570 nm), CAS—chrome azurol S (λ 550 nm). m/V = 0.10 g/5.0 mL, time of contact is 20 min.