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All Journal ALCHEMY Jurnal Penelitian Kimia KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia
Wahyu Triaji Rahadianto
Politeknik Negeri Sriwijaya
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Environmental Science Materials Science & Nanotechnology

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Pemanfaatan Karbon Aktif dari Cangkang Kelapa Termodifikasi Fe₃O₄ sebagai Adsorben untuk Menurunkan Kadar Logam Seng (Zn2+) Limbah Cair Yogi Chandra; Wahyu Triaji Rahadianto; Heni Sugesti
KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Vol 9 No 1 (2026): Jurnal Katalis Volume 9 Nomor 1 Tahun 2026
Publisher : Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/katalis.v9i1.13631

Abstract

Environmental pollution originating from industrial waste, including waste containing heavy metals such as ions (Zn²⁺), is a serious concern due to its toxic nature, which can endanger human health. Efforts to treat heavy metal waste continue to be developed, one of which is through adsorption, which is considered efficient, inexpensive, and environmentally friendly. The use of composite-based materials, such as Fe3O4 and coconut shell activated carbon, offers great potential because it combines the magnetic properties of Fe3O4 and the surface area of activated carbon, thereby facilitating the separation process and increasing adsorption capacity. This study aims to evaluate the effectiveness of activated carbon derived from coconut shells and modified with Fe₃O₄ as an adsorbent to reduce the zinc ion (Zn²⁺) content in liquid waste. Activated carbon was modified with Fe₃O₄ to increase its adsorption capacity and facilitate the separation of the adsorbent after the process. Fe3O4-modified activated carbon was characterized using Scanning Electron Microscopy (SEM) to observe the surface morphology and texture, as well as to verify the success of the modification. The SEM characterization results showed changes in the surface structure of activated carbon after Fe3O4 modification. Adsorption tests were conducted in batches to determine the optimal contact time parameter. Contact time variations were tested to determine the adsorption kinetics (Zn²⁺). The results showed that Fe3O4-modified activated carbon had good adsorption performance for (Zn²⁺) ions, achieving a significant reduction in concentration. The optimal contact time for adsorption (Zn²⁺) was found to be 75 minutes, at which the adsorption efficiency (%) reached 90.1%. The conclusion of this study is that Fe3O4-modified coconut shell activated carbon is a potential, efficient, and environmentally friendly adsorbent for treating liquid waste contaminated with heavy metals (Zn²⁺).
Synthesis and Characterization of an Adsorbent from Chicken Eggshell and Its Application for Methyl Orange Eka Sri Yusmartini; Mardwita Mardwita; Eko Ariyanto; Wahyu Triaji Rahadianto; Ikbal Oktaviansyah; Muhammad Dzaky Muzhaffar
ALCHEMY Jurnal Penelitian Kimia Vol 22, No 1 (2026): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.22.1.96880.170-178

Abstract

Eggshell is a part that protects egg components from various external threats, including chemical, physical, and biological factors. This study aimed to obtain an adsorbent from chicken eggshells using physical and chemical activation techniques. The quality of the eggshell-derived adsorbent was assessed and compared with the Indonesian National Standard (SNI) 1995, with a focus on parameters such as ash content, moisture content, and iodine absorption. The adsorbent obtained was applied to a solution of methyl orange, and Fourier transform infrared spectroscopy (FTIR) analysis was conducted before and after the adsorption process. Furthermore, the study stages include adsorbent preparation, activation, and adsorption. The adsorbent weight for this process was 17 grams, with time intervals of 15, 30, 45, 60, and 75 minutes. The results showed that both physically activated as well as physical and chemical activated adsorbents met the SNI 1995 standard, based on the parameters of water content (1.73% and 2.86%), ash content (8.18% and 6.745), and iodine absorption (761.40 mg/g and 774.09 mg/g). FTIR analysis confirmed the presence of a hydrocarbon and an OH group in the structure before and after adsorption. The optimum methyl orange adsorption capacity was achieved at an adsorbent mass of 17 grams and a contact time of 60 minutes, resulting in removal efficiencies of 20.38% for physical activation and 24.11% for physical and chemical activation.
Co-Authors Eka Sri Yusmartini Eko Ariyanto Heni Sugesti Ikbal Oktaviansyah Mardwita Muhammad Dzaky Muzhaffar Yogi Chandra