CD Tesis

Sintesis Komposit Karbon Aktif Pelepah Kelapa Sawit- Magnetit (Fe3o4) Dengan Variasi Mol Pengendap Naoh Sebagai Katalis Pendegradasi Metilen Biru

---

MACOPF has been successfully synthesized using various amounts of NaOH as a precipitating agent. The activated carbon was derived from oil palm frond biomass carbonized at 600°C for 60 minutes, chemically activated using KOH with a charcoal to KOH weight ratio of 1:3, and calcined at 800°C for 30 minutes. The synthesis of MACOPF was carried out using the coprecipitation method, where activated carbon was mixed with FeCl3•9H2O and FeSO4•7H2O, then precipitated by NaOH with varying mole ratios (0.25, 0.5, and 1 mole) at 70°C to obtain MACOPF 0.5, MACOPF 1, and MACOPF 2. This research aims to determine the effect from mol of NaOH on characteristics of the produced MACOPF and its MB adsorption and degradation capacity. The functional groups, crystallinity, lattice parameters, morphology, elemental composition, specific surface area, magnetism, and pHzpc of MACOPF were identified using FTIR, XRD, SEM-EDS, BET, and VSM techniques. The surface functional groups of MACOPF confirmed the composition of Fe3O4 with activated carbon, as evidenced by the presence of C-H, and Fe-O-C groups with intensities relatively similar across different NaOH mole ratios. XRD analysis revealed peaks Fe3O4 and carbon at 2θ = 35° and 26°, with crystal sizes ranging from 2.43 to 3.72 nm. MACOPF 1 exhibited the largest surface area, pore size, and pore volume at 314.021 m²/g, 2.0325 nm, and 3.1904 cc/g, respectively. SEM analysis showed a porous structure occupied by irregular and heterogeneous magnetite in MACOPF. EDS identification indicated an increased Fe and O content in MACOPF with higher NaOH concentrations, following the order MACOPF 0.5 < MACOPF 1 < MACOPF 2. The highest magnetic property was observed in MACOPF 1 with a saturation magnetization value of 7.67 emu/g. The pHzpc value increased with higher NaOH mole ratios. MACOPF 1 effectively degraded 95.88% of MB through the Fenton reaction under specific conditions: catalyst:reactant ratio of 1:4 (mg/mL), [H2O2] 5mM, pH 3, [MB]o = 50 mg/L, and temperature of 25°C, outperforming its constituent materials ACOPF and magnetite with MB removal efficiencies of 19.324% and 77.636%, respectively. MACOPF followed the Langmuir isotherm model with a qm value of 128.20 mg/g for MACOPF 1. The adsorption and degradation of MB by MACOPF followed second-order pseudo-kinetics with a rate constant k2 = 0.00211 (1/minute). The values of ΔHo = -45.821 kJ/mol indicated an exothermic reaction, ΔGo = -8,937 kJ/mol indicated an spontaneous reaction, ΔSo = -0.117 kJ/mol, and Ea = 25.221 kJ/mol. The addition of NaOH led to a lower activation energy. This research demonstrates that varying NaOH mole ratios in MACOPF result in differences in physicochemical properties and activity in MB adsorption and degradation Keywords: Activated carbon magnetite composite, coprecipitation, MB adsorption, MB degradation, Fenton

---

Ketersediaan

Informasi Detail

Judul Seri

-

No. Panggil

2110246776

Penerbit

Pekanbaru : Universitas Riau Pascasarjana Tesis Pendidikan Kimia., 2024

Deskripsi Fisik

-

Bahasa

Indonesia

ISBN/ISSN

-

Klasifikasi

2110246776

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

PENDIDIKAN KIMIA

Info Detail Spesifik

-

Pernyataan Tanggungjawab

Jaka

Versi lain/terkait

Lampiran Berkas

Komentar

---

Anda harus masuk sebelum memberikan komentar