Typical Synthesis and Environmental Application of Novel Ti Nanoparticles - Advanced Materials for Agriculture, Food and Environmental Safety - page 423

O

O
O - Na +

N S

N

N

( a ) ( b )

Figure 15.2 (a) h e chemical structure of MO; (b) Model structure of Methyl orange.

Cl

N

O N

CO 2

Figure 15.3 h e chemical structure of Rhodamine B.

of methyl orange was detected by a UV-vis spectrophotometer at 464
nm. h e chemical and model structure of methyl orange is shown in
Figure 15.2a and 15.2b.

15.2.2 Rhodamine B (RB)

h e chemical structure of Rhodamine B is shown in Figure 15.3. It is
used as a dye or pigment and is a neutral indicator. h e degradation of
Rhodamine B is dependent on the catalyst and UV/visible light irradia-
tion, and the rate of the reaction is also dependent on the loading of pho-
tocatalyst. h e absorbance of Rhodamine B is 554 nm, which was detected
by a UV-vis spectrophotometer.

15.2.3 h ymol Blue (TB)

h e chemical structure of thymol blue (C 27 H 30 O 5 S) is shown in Figure 15.4.
It is used as an acid base indicator. Because thymol blue turns blue in an
alkaline solution and yellow in acidic solution, its absorbance was 597 nm
when analyzed by UV-vis spectrophotometer.