Optimasi Adsorpsi Nitrat Menggunakan Karbon Aktif Tongkol Jagung Dan Tempurung Kelapa Teraktivasi KOH Dengan FCCD-RSM

Rizqullah, Aflah Farchan (2026) Optimasi Adsorpsi Nitrat Menggunakan Karbon Aktif Tongkol Jagung Dan Tempurung Kelapa Teraktivasi KOH Dengan FCCD-RSM. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kontaminasi nitrat menimbulkan ancaman signifikan bagi ekosistem perairan, karena berkontribusi pada eutrofikasi, menurunkan kualitas air, dan risiko bagi kesehatan manusia. Adsorpsi adalah metode yang efektif dan sederhana untuk mengurangi konsentrasi nitrat dalam air. Penelitian ini menyelidiki penghilangan nitrat menggunakan campuran tongkol jagung dan tempurung kelapa teraktivasi KOH. Face Centered Composite Central Design (FCCD) dalam Response Surface Methodology (RSM) diterapkan untuk menentukan parameter optimal secara bersamaan, yang meliputi dosis adsorben (10; 30; 50 mg), konsentrasi adsorbat (25; 50; 100 mg/L), dan waktu kontak adsorpsi (30; 60; 90 menit). Karbon aktif dikarakterisasi dengan Fourier Transform Infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), X-Ray Diffraction (XRD), dan Brunauer-Emmett-Teller (BET). Efisiensi penghilangan nitrat dianalisis menggunakan spektrofotometer UV-Vis pada 540 nm. Hasil karakterisasi menunjukkan bahwa proses aktivasi meningkatkan luas permukaan spesifik, volume pori, dan situs aktif dalam adsorpsi nitrat. Karbon aktif menunjukkan luas permukaan spesifik yang tinggi (557,7 m²/g), volume pori (0,516 cm³/g), dan diameter pori rata-rata (3,7 nm). Efisiensi penghilangan nitrat maksimum mencapai 98,60 % dengan kapasitas adsorpsi 41.08 mg/g. Kurva isoterm adsorpsi dan data kinetika sesuai dengan model Langmuir dan model pseudo-second order, yang menunjukkan bahwa proses adsorpsi adalah kemisorpsi. Hasil ini mengkonfirmasi efektivitas karbon aktif yang berasal dari limbah pertanian sebagai adsorben berkelanjutan untuk adsorpsi nitrat dalam aplikasi pengolahan air.
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Nitrate contamination poses a significant threat to aquatic ecosystems, as it contributes to eutrophication, decreases water quality, and risks to human health. Adsorption is an effective and simple method for reducing nitrate concentration in water. This study investigated nitrate removal using a mixture of corn cob and coconut shell using KOH activation. Face Centered Composite Central Design (FCCD) in response surface methodology (RSM) was applied to simultaneously determine the optimal parameters, which include adsorbent dose (10; 30; 50 mg), adsorbate concentration (25; 50; 100 mg/L), and adsorption contact time (30; 60; 90 minutes). The activated carbon was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), X-ray Diffraction (XRD), and Brunauer–Emmett–Teller (BET) spectroscopy. The nitrate removal efficiency was analyzed using a UV–Vis spectrophotometer at 540 nm. The characterization results showed that the activation process increases the specific surface area, pore volume, and active sites in nitrate adsorption. The activated carbon exhibited a high specific surface area (557,7 m² g⁻¹), pore volume (0,516 cm³ g⁻¹), and average pore diameter (3,7 nm). The maximum nitrate removal efficiency reached 98.60% with an adsorption capacity of 41.08 mg/g. The adsorption isotherm and kinetic data were fitted well with Langmuir and pseudo-second order model, indicating that the adsorption process was chemisorption. These results confirm the effectiveness of agricultural waste derived activated carbon as sustainable adsorbent for nitrate adsorption in water treatment applications.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Adsorpsi, Nitrat, Tongkol Jagung, Tempurung Kelapa, Response Surface Methodology =========================================================== Adsorption, Nitrate, Corncob, Coconut Shell, Response Surface Methodology
Subjects:	Q Science > QD Chemistry > QD117.S64 Spectrophotometry Q Science > QD Chemistry > QD251.2 Chemistry, Organic. Biochemistry Q Science > QD Chemistry > QD281 Pyrolysis Q Science > QD Chemistry > QD547 Flocculation, precipitation, adsorption, etc. Q Science > QD Chemistry > QD75.2 Chemistry, Analytic
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47101-(S2) Master Thesis
Depositing User:	Aflah Farchan Rizqullah
Date Deposited:	23 Jan 2026 08:51
Last Modified:	23 Jan 2026 08:51
URI:	http://repository.its.ac.id/id/eprint/130253

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