Pemanfaatan Limbah Ampas Kelapa sebagai Biosorben dengan Aktivator Asam Fosfat untuk Penyerapan Ion Logam Besi

Nugroho, Rizky Agung (2026) Pemanfaatan Limbah Ampas Kelapa sebagai Biosorben dengan Aktivator Asam Fosfat untuk Penyerapan Ion Logam Besi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pencemaran air oleh logam berat, khususnya ion besi (Fe³⁺), menjadi permasalahan lingkungan yang memerlukan metode pengolahan yang efektif dan berkelanjutan. Penelitian ini mengevaluasi potensi karbon aktif berbasis limbah ampas kelapa sebagai adsorben untuk penyisihan ion Fe³⁺ dari larutan berair. Ampas kelapa dikarbonisasi dan diaktivasi secara kimia menggunakan asam fosfat (H₃PO₄) dengan variasi konsentrasi 1 N, 3 N, dan 5 N serta ukuran partikel (60, 80, dan 100 mesh). Proses adsorpsi dilakukan secara batch, sedangkan konsentrasi Fe³⁺ dianalisis menggunakan AAS. Hasil penelitian menunjukkan bahwa kondisi optimum diperoleh pada karbon aktif ampas kelapa teraktivasi H₃PO₄ 3 N dengan ukuran partikel 100 mesh. Kajian terhadap adsorpsi isoterm pada biosorben menunjukkan bahwa, model Freundlich memberikan kecocokan terbaik dengan R² = 0,999983 dan n = 2,001, sedangkan model Langmuir menghasilkan kapasitas monolayer maksimum qₘ = 0,722 mg/g dengan R² = 0,9514. Pada rentang konsentrasi awal yang diuji, kapasitas adsorpsi setimbang (qₑ) meningkat dari 0,0479 mg/g hingga 0,6450 mg/g. Dengan demikian, karbon aktif ampas kelapa berpotensi dimanfaatkan sebagai adsorben alternatif berbasis biomassa untuk pengolahan air tercemar Fe³⁺.
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Water pollution by heavy metals, particularly iron ions (Fe³⁺), has become an environmental problem that requires effective and sustainable treatment methods. This study evaluates the potential of activated carbon derived from coconut residue waste as an adsorbent for the removal of Fe³⁺ ions from aqueous solutions. Coconut residue was carbonized and chemically activated using phosphoric acid (H₃PO₄) at varying concentrations of 1 N, 3 N, and 5 N, as well as particle sizes of 60, 80, and 100 mesh. The adsorption process was carried out in batch mode, while Fe³⁺ concentrations were analyzed using atomic absorption spectrophotometry (AAS). The results showed that the optimum condition was achieved using coconut-residue-based activated carbon activated with 3 N H₃PO₄ and a particle size of 100 mesh. Isotherm adsorption studies on the biosorbent indicated that the Freundlich model provided the best fit, with an R² value of 0.999983 and an n value of 2.001, whereas the Langmuir model yielded a maximum monolayer adsorption capacity (qₘ) of 0.722 mg/g with an R² value of 0.9514. Within the range of initial concentrations investigated, the equilibrium adsorption capacity (qₑ) increased from 0.0479 mg/g to 0.6450 mg/g. Therefore, activated carbon derived from coconut residue has strong potential to be utilized as an alternative biomass-based adsorbent for the treatment of Fe³⁺-contaminated water.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Adsorpsi, Ampas Kelapa, Fe³⁺, Isoterm, Kinetika Adsorption, Coconut Dregs, Fe³⁺, Isotherm, Kinetics
Subjects:	Q Science > QD Chemistry > QD117 Absorption
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Rizky Agung Nugroho
Date Deposited:	09 Sep 2026 05:52
Last Modified:	09 Sep 2026 05:52
URI:	http://repository.its.ac.id/id/eprint/144454

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