Table 1.

Characteristics of the interaction of silica–titania xerogels with triphenylmethane dyes.

Triphenylmethane Dye	λmax, nm	pH Optimum	T1/2, min	Keq, M−1	Capacity, µmol/g (n = 3, P = 0.95)
Pyrocatechol violet	640	7.3	4.2	13,500	0.5 ± 0.1
Eriochrome cyanine R	570	2.0	2.1	1200	0.9 ± 0.2
Chrome azurol S	550	3.0	2.5	1400	0.8 ± 0.2