Degradation of volatile organic compounds in the gas phase by heterogeneous photocatalysis with titanium dioxide/ultraviolet light

Figures & data

Figure 1. Reactor design.

Figure 2. Photodegradation conversion of n-octane versus humidity.

Figure 3. Photodegradation conversion of n-octane versus inlet concentration.

Figure 4. Photodegradation conversion of o-xylene versus residence time.

Figure 5. First-order kinetic model adjustment for n-octane photodegradation.

Table 1. Data for linear adjustments of first-order kinetic model

Degraded VOC	C0^min–C0^max (ppmv)	ϕ (%)	T (°C)	R^2	K′ (sec^−1)	b
n-Octane	83.0–115.0	27	56	0.9928	0.1587	0.0169
n-Decane	79.0–87.0	40	52	0.9908	0.0202	1.8452
n-Hexane	17.5–138.3	40	60	0.9909	0.1165	−0.0144
Methylcyclohexane	108.6–134.6	35	59	0.9924	0.0828	−0.1383
2,2,4-Trimethypentane	85.0–116.3	35	58	0.9991	0.1092	−0.0163

Figure 6. Second-order kinetic model adjustment for n-octane photodegradation.

Table 2. First-order data at different temperatures: Comparison for photodegradation of n-octane and n-decane

n-Octane				n-Decane
R^2	K′ (sec^−1)	R^2	K′ (sec^−1)	R^2	K′ (sec^−1)	R^2	K′ (sec^−1)
0.9906	0.1594	0.9965	0.1465	0.9878	0.0218	0.993	0.0193