## 3 Experimental Procedure
### Characterization of Adsorbents  
A thermogravimetric analysis (TGA) was used to obtain the thermal decomposition behavior of the materials. The analysis was carried out on a PerkinElmer PyrisDiamond under a dry air flow of 50 mL min\({}^{-1}\) with a heating rate of 10 \({}^{\circ}\)C min\({}^{-1}\) from 40 \({}^{\circ}\)C to 1000 \({}^{\circ}\)C. The element analysis was performed on a LECO Corporation 628 Series CHNS/O elemental analyzer to determine the total amount of nitrogen incorporated into the materials. Fourier-transform infrared spectroscopy (FTIR) was applied to verify the presence of rubber and amine-functional groups in the nanocomposites. The FTIR spectra were collected over the wavenumber of 4000-400 cm\({}^{-1}\) at room temperature in attenuated total reflectance (ATR) mode on a PerkinElmer Spectrum One Fourier-transform infrared spectrometer. The type and relative concentration of silica species presenting in the materials were measured by solid-state \({}^{29}\)Si cross polarization/magic angle spinning nuclear magnetic resonance spectroscopy (\({}^{29}\)Si CP/MAS NMR). The NMR spectra were acquired on a Bruker Ascend 400 WB Fourier-transform nuclear magnetic resonance spectrometer. The instrument was operated at 79.4 MHz with a sample spinning frequency of 5 kHz, a delay time of 3 s and a CP contact time of 2.5 ms. Sodium trimethylsilylpropanesulfonate was used as an internal standard to quote the chemical shifts of \({}^{29}\)Si MAS NMR spectra in parts per million (ppm). The relative band area of each silica species was achieved by a curve-fitting analysis using a series of Gaussian curves (OriginPro 8.5 software). The mesostructured arrangement of the synthesized materials was analyzed by power X-ray diffraction (XRD) using a Bruker D8 ADVANCE diffractometer equipped with Cu K\(\alpha\) radiation at 40 kV and 40 mA. The diffraction was measured in the range of 2\(\theta\) = 0.5-10\({}^{\circ}\) with a scanning step of 0.02\({}^{\circ}\) and a count time of 1 s. The repeating distance (\(a_{0}\)) between the pore centers of the mesostructure was calculated from the interplanar spacing of (100) plane (\(a_{100}\)) using the formula; \(a_{0}\) = 2\(d_{100}/\sqrt{3}\). The N\({}_{2}\) physisorption measurement was used to access the textural properties of the materials without and with the amine-functional group. The adsorption-desorption of N\({}_{2}\) was carried out at \(-\)196 \({}^{\circ}\)C using a surface area and porosity analyzer (Micromerities ASAP 2020). Prior to the measurement, the sample was degassed at 150 \({}^{\circ}\)C for 2 h. The specific surface area (\(S_{\mathrm{BET}}\)) was calculated using the Brunauer\(-\)Emmett\(-\)Teller (BET) method with the adsorption data in the relative pressure (\(P/P_{0}\)) range of 0.02-0.2, while the total pore volume (\(V_{\mathrm{t}}\)) was determined from the accumulative volume of N\({}_{2}\) adsorbed at a \(P/P_{0}\) of about 0.990. The external surface area (\(S_{\mathrm{ext}}\)) and primary mesopore volume (\(V_{\mathrm{p}}\)) were determined using the \(t\)-plot method. The pore size (\(D_{\mathrm{p}}\)) was determined by the Barrett-Joyner-Halenda (BJH) method using the adsorption branch data of N\({}_{2}\) sorption isotherms. The effect of functionalization on the morphology of the resulting materials was investigated by field-emission scanning electron microscopy (FE-SEM). The FE-SEM images were recorded on a Hitachi SU5000 instrument at an acceleration voltage of 40 kV. The sample powder was deposited on carbon tape, followed by platinum coating. The particle size and interparticle voids were measured using ImageJ software. Transmission electron microscopy (TEM) was used to confirm the mesoporous structure of the nanocomposites. The TEM micrographs were observed at a magnification of 150,000\(\times\) using a JEOL 2010 transmission electron microscope operated at 200 kV. The materials' hydrophobicity was evaluated by H\({}_{2}\)O adsorption-desorption measurement using a BEL Japan BELSORP-max instrument.