Skripsi

OPTIMASI ADSORPSI ION Mn MENGGUNAKAN KOMPOSIT CaO/Fe3O4 DENGAN RESPONSE SURFACE METHODOLOGY

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Acid Mine Drainage (AMD) occurs as a result of runoff formed from the oxidation of sulfide minerals that are exposed to atmospheric air and mix with water. AMD is one of the causes of environmental pollution, making its treatment essential to reduce the negative impacts it causes. One of the methods used is the adsorption method. Adsorption is employed because it is a simple and low-cost process. For the adsorption process to work effectively, an adsorbent is required. In this study, the adsorbent used was derived from bamboo shell. The bamboo clam shell was calcined at 800 °C for 6 hours to decompose calcium carbonate (CaCO₃) into calcium oxide (CaO). The resulting CaO was then composited with Fe₃O₄ in a 3:1 mass ratio to facilitate separation using an external magnet. The VSM characterization results showed that the saturation magnetization (Ms) value of the CaO/Fe₃O₄ composite was approximately 63 emu/g. XRD characterization results showed diffraction peaks for CaO at 2θ = 32.42° and 54.25°, corresponding to ICSD 02-6959, with an average crystal size of 35 nm. Fe₃O₄ diffraction peaks appeared at 2θ = 18.07°, 30.45°, 35.57°, 43.20°, 47.11°, 57.23°, and 62.63°, consistent with ICSD 08-4611, with a crystal size of 32.37 nm. The XRD results also indicated a Ca(OH)₂ peak at 2θ = 34.10°. FTIR characterization showed a Ca–O bond vibration at a wavenumber of 875.56 cm⁻¹, a Fe–O bond at 555.14 cm⁻¹, and an OH group from Ca(OH)₂ at 3508.32 cm⁻¹. BET characterization results revealed that the CaO/Fe₃O₄ composite had a surface area of 50.376 m²/g. Optimization was conducted using Response Surface Methodology (RSM) with Central Composite Design (CCD). The adsorption of Mn ions in AMD waste reached optimum results at a contact time of 35 minutes and an initial pH of 6.24, reducing Mn concentration from 2.5383 mg/L to 0.0175 mg/L, achieving 99% efficiency. In comparison, an AMD sample adjusted to pH 2.5 with the same initial concentration showed a decrease in Mn concentration to 0.0073 mg/L, also with 99% efficiency.

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Detail Information

Series Title

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Call Number

T1859902025

Publisher

Indralaya : Prodi Ilmu Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Sriwijaya., 2025

Collation

xx, 88 hlm.; ilus.; tab.; 29 cm.

Language

Indonesia

ISBN/ISSN

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Classification

540.07

Content Type

Text

Media Type

unmediated

Carrier Type

other (computer)

Edition

-

Subject(s)

air asam tambang
Prodi Ilmu Kimia

Specific Detail Info

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Statement of Responsibility

MI

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