Thermal Treatment of Cerium Oxide and Its Properties: Adsorption Ability versus Degradation Efficiency

Table 4

Parameters of kinetic curves for the degradation of parathion methyl (a) and creation of 4-nitrophenol (b).

(a) Degradation of parathion methyl

Storage conditions for cerium oxide	𝑞^∗∞^a	𝑘^∗1 (min^−1)^a	𝑡1/2 (min)	𝑅^2	RSS
KNO3 solution, ca. 95% humidity	0.771 (0.034)	0.016 (0.006)	115.4	0.9569	0.0012
Solid KOH, dry air	0.151 (0.067)	0.047 (0.017)	40.9	0.8957	0.0490
Wet CO2	0.639 (0.008)	0.032 (0.002)	290.6	0.9962	0.0004
Mg(NO3)2 solution, ca. 50% humidity	0.623 (0.018)	0.027 (0.004)	168.8	0.9862	0.0014
Vapors of formic acid	0.983 (0.007)	N	N	N	N
NH3 vapors	0.717 (0.022)	0.045 (0.014)	49.4	0.9230	0.0052

(b) Creation of 4-nitrophenol

Storage conditions for cerium oxide	𝑞∞^a	𝑘1 (min^−1)^a	𝑡1/2 (min)	𝑅^2	RSS
KNO3 solution, ca. 95% humidity	0.170 (0.017)	0.023 (0.006)	124.9	0.9543	0.0010
Solid KOH, dry air	0.833 (0.066)	0.069 (0.021)	33.1	0.8720	0.0771
Wet CO2	0.288 (0.006)	0.035 (0.002)	286.4	0.9953	0.0004
Mg(NO3)2 solution, ca. 50% humidity	0.401 (0.046)	0.019 (0.005)	132.5	0.9553	0.0053
Vapors of formic acid	N	N	N	N	N
NH3 vapors	0.278 (0.019)	0.025 (0.005)	153.7	0.9747	0.0017

aStandard errors given in parentheses; N: not determined.