SILIKA GEL BERBAHAN DASAR ABU DASAR BATUBARA-PASIR SILIKA DARI PABRIK GULA MADUKISMO SEBAGAI ADSORBEN ZAT WARNA MALASIT HIJAU
Vera Indera Kurnia Sari, Prof. Dr.rer.nat. Nurul Hidayat Aprilita, S.Si., M.Si. ; Suherman, S.Si., M.Sc., Ph.D.
2023 | Skripsi | KIMIA
Research on the silica gel based on coal bottom ash-silica sand Madukismo sugar factory as an adsorbent of malachite green dye has been carried out. Coal bottom ash-silica sand was activated with reflux method for 4 hours using 6 M HCl solution. Research continued with produce sodium silicate that the activated coal bottom ash-silica sand was melted with 3 M NaOH. The sodium silicate was then dripped with 3 M HCl until silica gel was formed. Coal bottom ash-silica sand, activated coal bottom ash-silica sand, and synthesized silica gel were characterized by X-Ray fluorescence (XRF), infrared spectrometer (FTIR), and X-Ray diffraction (XRD). The dye adsorption process was studied by various parameters, such as pH, interaction time, adsorbent mass, and initial concentration of adsorbate.
The characterization results show that the main components of coal bottom ash were Si and Al. The characterization results show that the activation process success in removing impurities and increasing the Si/Al ratio. The synthesized silica gel had a main components of silica elements and had an active sites of silanol and siloxane functional groups. The optimum condition for the adsorption process of cationic dye malachite green with silica gel adsorbent were obtained at a solution of pH 8, interaction time of 30 min., adsorbent mass of 0.15 g, and with initial concentration of 700 ppm. Adsorption of cationic dye malachite green with silica gel follows a pseudo-second order with rate constants of 5.168 g mg-1 min-1 and follows Langmuir isotherm with adsorption maximum capacity of 69.930 mg g-1 as well as adsorption energies of 27.403 kJ mol-1.
Kata Kunci : abu dasar, adsorpsi, malasit hijau, silika gel