Fitting parameters for DP phototransformation under different reaction conditions by pseudo-first-order model.

Reaction condition	K DP (min−1)	R 2	t 1/2 (min)
No sand	(1.73 ± 0.02) × 10−3	0.999	400.7
DS sand	(3.80 ± 0.05) × 10−3	0.999	182.4
SS sand	(7.40 ± 0.04) × 10−3	0.986	93.7
DS sand + IPA	(3.52 ± 0.07) × 10−3	0.998	196.9
DS sand + BQ	(0.74 ± 0.07) × 10−3	0.961	936.7
SS sand + IPA	(4.3 ± 0.3) × 10−3	0.984	161.2
SS sand + BQ	(1.41 ± 0.06) × 10−3	0.993	491.6
DS sand treated with H2O2	(2.34 ± 0.08) × 10−3	0.994	296.2
SS sand treated with H2O2	(1.82 ± 0.08) × 10−3	0.989	380.9
DS sand + N2	(6.68 ± 0.02) × 10−3	0.997	103.7
SS sand + N2	(1.6 ± 0.2) × 10−2	0.927	43.3