Adsorpsi Toluena dan Silena pada Bahan Magnetik Pasir Besi Terlapis Silika-Agen Hidrofobik

Irene Arliana Yuanita, Prof. Dr.rer.nat. Nuryono, M.S; Prof. Dr. Bambang Rusdiarso, DEA

2019 | Skripsi | S1 KIMIA

Perilaku adsorpsi toluena dan silena yang mewakili komponen minyak bumi yang terdapat dalam air dengan bahan magnetik pasir besi terlapis silika-agen hidrofobik (BMPB@SiO2/hf) telah diteliti. Penelitian diawali dengan mensintesis BMPB@SiO2/hf dengan melapisi BMPB dengan silika termodifikasi agen hidrofobik melalui proses sol-gel. BMPB ditambahkan dengan larutan Na2SiO3 dan organosilan (agen hidrofobik). Organosilan yang digunakan adalah heksadesiltrimetoksisilan (HDTMS), metiltrietoksisilan (MTES) dan feniltrietoksisilan (PTES); dan efek dari perbandingan mol antara silika dan organosilan dalam karakter produk telah dievaluasi. Adsorben dikarakterisasi dengan Fourier Transform Infrared Spectrophotometer (FT-IR), X-ray Diffraction (XRD) dan Scanning Electron Microscope- Energy Dispersive Spectroscopy (SEM-EDS). Adsorben tersebut digunakan untuk menyerap toluena dan silena yang terdapat dalam air dengan sistem batch dengan variasi waktu kontak dan konsentrasi. Konsentrasi sebelum dan sesudah adsorpsi larutan toluena dan silena dianalisis dengan spektrofotometer UV-Vis. Hasil dari karakterisasi menunjukkan bahwa BMPB@SiO2/hf berhasil disintesis. Adsorpsi toluena dan silena dengan BMPB@SiO2/hf mengikuti kinetika reaksi orde dua semu dan isoterm adsorpsi Freundlich. Kapasitas adsorpsi dari toluena dengan BMPB@SiO2/HDTMS, BMPB@SiO2/PTES dan BMPB@SiO2/MTES, yaitu 77, 77 dan 79 mg/g; 127, 136 serta 123 mg/g untuk silena. Berdasarkan nilai-nilai tersebut, adsorben mempunyai potensi untuk diaplikasikan dalam menghilangkan pencemaran minyak bumi di perairan.

Adsorption characteristics in water of toluene and xylene as representatives of petroleum oil components on iron sand magnetic particle coated hydrophobic-silica (BMPB@SiO2/hf) has been investigated. The initial works was synthesis of BMPB@SiO2/hf by coating BMPBs with hydrophobic groups modified silica through sol-gel process. BMPBs were added with Na2SiO3 solution, and hydrophobic organosilane. The organosilanes used were hexadecyltrimethoxysilane (HDTMS), metyltriethoxysilane (MTES) and phenyltriethoxysilane (PTES); the effect of mole ratio of silica to organosilane on the product characters was evaluated. Adsorbent characterized by Fourier Transform Infrared Spectrophotometer (FT-IR), X-ray Diffraction (XRD) and Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS). The products were used to adsorb toluene and xylene from aqueous solution in a batch system at various contact time and concentration. The concentration before and after adsorption of toluene and xylene in the solution was analyzed by ultraviolet-visible spectrophotometer. The result of the characterization showed that BMPB@SiO2/hf was successfully produced. The adsorption of the toluene and xylene on BMPB@SiO2/hf followed a kinetics model of pseudo-second order and Freundlich isotherm adsorption. The adsorption capacity of toluene on BMPB@SiO2/HDTMS, BMPB@SiO2/PTES and BMPB@SiO2/MTES, namely 77, 77 and 79 mg/g, respectively; 127, 136 and 123 mg/g, respectively for xylene. Those values lead to potential of the adsorbents to be applied for removal of petroleum pollutants from the aquatic environments.

Kata Kunci : adsorpsi, BMPB/SiO2/hf, silena dan toluena