SINTESIS NANOPARTIKEL CoFe2O4-ASAM OLEAT/SiO2 TERMODIFIKASI MONONATRIUM GLUTAMAT SEBAGAI ADSORBEN ION [AuCl4]-

FINA KHIYARATUN N, Drs. Roto, M.Eng., Ph.D; Taufik Abdillah Nasir, S.Si., M.Sc., Ph.D.

2021 | Skripsi | S1 KIMIA

Sintesis nanopartikel kobalt ferit (CoFe2O4) sebagai adsorben ion [AuCl4]- telah berhasil dilakukan. Nanopartikel CoFe2O4 disintesis dengan menggunakan metode kopresipitasi dengan asam oleat sebagai surfaktan. Pelapisan CoFe2O4 dengan SiO2 dilakukan menggunakan metode sol-gel. Sebelum modifikasi nanopartikel CoFe2O4-AO/SiO2 dengan mononatrium glutamat (MSG), (3-Aminopropyl)trimethoxysilane (APTMS) ditambahkan sebagai agen penghubung untuk menambahkan gugus fungsi -NH2. Nanopartikel CoFe2O4-AO/SiO2/MSG yang dihasilkan dikarakterisasi menggunakan Fourier Transform Infrared (FTIR), X-ray Diffraction (XRD), Vibrating Sample Magnetometer (VSM) dan Transmission Electron Microscope (TEM). Adsorpsi ion [AuCl4]- dilakukan dengan mengoptimasi pH larutan, massa adsorben, konsentrasi awal larutan ion Au(III), dan waktu kontak Nanopartikel CoFe2O4-AO/SiO2/MSG berhasil disintesis dengan diameter rata-rata partikelnya 20 nm. Kondisi adsorpsi optimum terhadap [AuCl4]- terjadi pada pH 2, massa adsorben sebanyak 0,006 g, konsentrasi awal ion [AuCl4]- sebesar 60 mg L-1 dan waktu kontak optimum adalah 1680 menit. Model isoterm adsorpsi ion [AuCl4]- oleh adsorben nanopartikel CoFe2O4-AO/SiO2/MSG menggunakan model isoterm Langmuir dengan energi 26,35 kJ mol-1, kapasitas adsorpsi optimum sebesar 97,38 mg g 1 dan laju reaksi 2,01 x 10-5 g mg-1 menit-1. Kinetika adsorpsi mengikuti kinetika adsorpsi orde dua semu (Ho).

Cobalt ferrite (CoFe2O4) nanoparticles as [AuCl4]- adsorbent has been successfully prepared. The CoFe2O4 nanoparticles were synthesized using the coprecipitation method with oleic acid as a surfactant. The as-prepared CoFe2O4 was coated by SiO2 using the sol-gel method. Before modification with MSG, (3-aminopropyl)trimethoxysilane (APTMS) was applied as a coupling agent to add �NH2 functional group. The CoFe2O4-AO/SiO2/MSG nanoparticles were characterized using Fourier Transform Infrared (FTIR), X-ray Diffraction (XRD), Vibrating Sample Magnetometer (VSM), and Transmission Electron Microscope (TEM). The adsorption reaction of [AuCl4]- on CoFe2O4-AO/SiO2/MSG nanoparticles was also studied to obtain the optimum condition, such as the solution pH, dosage of adsorbent, initial solution concentration of Au(III) ion, and contact time. The CoFe2O4-AO/SiO2/MSG nanoparticles were successfully synthesized with an average diameter of 20 nm. The optimum condition of [AuCl4]- adsorption on CoFe2O4-AO/SiO2/MSG nanoparticles was obtained when the pH solution was 2, the dosage of adsorbent was 0.006 g, initial concentration of [AuCl4]- was 60 mg L-1, and contact time was 1680 min. The adsorption isotherm of [AuCl4]- on CoFe2O4-AO/SiO2/MSG is in accordance with the Langmuir isotherm, giving the energy of 26.35 kJ mol-1, the capacity of 97.38 mg Au(III)/g, and the reaction rate of 2.01 x 10-5 g mg-1 min-1. The adsorption kinetics follows the pseudo-second-order of reaction (Ho).

Kata Kunci : adsorption, AuCl4- ion, magnetic, oleic acid, monosodium glutamate