Sorption of BTEX on a nanoporous composite of SBA-15 and a calcined hydrotalcite

Nano Convergence

Table 4 Freundlich equation parameters for volatile organic compound (VOC) adsorption in SBA-15, HT_C, and SBA-15/HT_C25

VOCs	T (°C)	SBA-15			HT_C			SBA-15/HT_C25
VOCs	T (°C)	k _f	1/n	R _f	k _f	1/n	R _f	k _f	1/n	R _f
Benzene	300	0.024	1.884	0.994	0.017	2.325	0.998	0.03	1.658	0.994
	260	0.025	1.858	0.99	0.016	2.187	0.997	0.029	1.708	0.994
	225	0.027	1.848	0.994	0.017	2.291	0.993	0.032	1.721	0.995
	185	0.027	1.738	0.998	0.017	2.281	0.997	0.033	1.633	0.995
	150	0.032	1.667	0.997	0.018	2.205	0.999	0.039	1.555	0.995
Toluene	300	0.021	1.949	0.999	0.016	2.305	0.994	0.024	1.523	0.987
	260	0.025	1.829	0.995	0.014	2.201	0.993	0.028	1.727	0.995
	225	0.027	1.732	0.995	0.013	2.139	0.997	0.031	1.663	0.996
	185	0.031	1.533	0.996	0.014	2.193	0.999	0.035	1.549	0.995
	150	0.041	1.575	0.998	0.019	2.159	0.995	0.046	1.314	0.988
p-Xylene	300	0.022	1.893	0.997	0.011	2.095	0.988	0.027	1.732	0.997
	260	0.022	1.819	0.998	0.007	2.315	0.994	0.029	1.682	0.996
	225	0.026	1.786	0.997	0.013	2.206	0.997	0.034	1.541	0.994
	185	0.044	1.472	0.992	0.016	2.155	0.998	0.038	1.442	0.995
	150	0.069	1.19	0.977	0.019	2.16	0.995	0.047	1.353	0.999
Ethylbenzene	300	0.02	1.951	0.999	0.014	2.152	0.976	0.026	1.764	0.999
	260	0.023	1.85	0.999	0.015	2.274	0.981	0.027	1.705	0.999
	225	0.028	1.723	0.995	0.012	2.155	0.997	0.03	1.611	0.998
	185	0.042	1.527	0.99	0.015	2.201	0.998	0.039	1.391	0.989
	150	0.091	1.213	0.997	0.018	2.193	0.994	0.055	1.364	0.989

Where T is the experimental temperature in K, k_f (mmHg⁻¹) is the value of the Freundlich constant, 1/n is the empirical constant, and R_f is the correlation factor