Photo-Oxidation of Rhodamine-6-G via TiO₂ and Au/TiO₂-Bound Polythene Beads

Table 1

Photodegradation rate and yields of R6G (1 × 10⁻⁵ mol dm⁻³) in the photocatalytic experiments under dark and sunlight irradiation (the exposure or incubation time was 210 for all experiments except for no. 7. The irradiation time was 105 min) at 𝜆_max = 526 nm.

Samples	Photodegradation or adsorption yield % = (𝐴0−𝐴𝑡/𝐴0)100	Photodegradation or adsorption rate (𝐴0−𝐴𝑡/𝑡)mol dm^-3sec^−1
(1) Photodegradation Blank 1 [Sun]	0	0
(2) Adsorption Blank 2 (HDPE + R6G [Dark])	2	1.6×10^−6
(3) Photodegradation Blank 3 (HDPE + R6G [Sun])	6	3.4×10^−6
(4) Adsorption (HDPE + TiO2 + R6G [Dark])	48	2.7×10^−5
(5) Adsorption (HDPE + Au/TiO2 + R6G [Dark])	72	5.3×10^−5
(6) Photodegradation (HDPE + TiO2 + R6G [Sun])	89	5.1×10^−5
(7) Photodegradation (HDPE + Au/TiO2 + R6G [Sun])	86	9.8×10^−5