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Table 4 Freundlich equation parameters for volatile organic compound (VOC) adsorption in SBA-15, HTC, and SBA-15/HTC25

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

VOCs T (°C) SBA-15 HTC SBA-15/HTC25
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
  1. Where T is the experimental temperature in K, kf (mmHg−1) is the value of the Freundlich constant, 1/n is the empirical constant, and Rf is the correlation factor