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ADHESIVE BEHAVIOR OF POLYCAPROLACTONE/HYDROXYAPATITE COATINGS ON 316L STAINLESS STEEL: A DESIGN OF EXPERIMENTS APPROACH Agung Prabowo; Ahmad Fadli; Heni Sugesti; Muh Irwan; Syarifuddin Oko; Gading Bagus Mahardika; Marlinda
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.6212

Enhancing the adhesive strength of bioactive coatings is crucial for improving the mechanical stability of metallic implants. This study investigates the effects of three processing parameters—sonication temperature (X₁), PCL/HA ratio (X₂), and drying time (X₃)—on the adhesive strength of poly(ε-caprolactone)/hydroxyapatite (PCL/HA) composite coatings applied to 316L stainless steel substrates. A full factorial 23 experimental design was employed, and the results were analyzed using analysis of variance (ANOVA) and regression modeling. The adhesive strength response ranged from 19.62 MPa to 63.27 MPa. Among the factors studied, the PCL/HA ratio had the most significant positive effect, while drying time showed a minor influence. Interaction plots and response surface analyses revealed a synergistic effect between sonication temperature and PCL/HA ratio, contributing to improved bonding at the coating-substrate interface. The optimization results yielded a predicted maximum adhesive strength of 25.76 MPa at a desirability score of 0.03, highlighting the complexity of parameter interactions. These findings underscore the importance of processing conditions in tailoring coating performance for biomedical applications.

SURFACE AREA DRIVEN CRYSTALLINITY CHANGES OF HYDROXYAPATITE DURING SIMULATED BODY FLUID IMMERSION Agung Prabowo; Ahmad Fadli; Heni Sugesti; Muh Irwan
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 8 No. 1 (2026): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v8i1.7420

The bioactivity of hydroxyapatite (HA) powders is strongly influenced by surface area and crystallinity. This study evaluates the effect of surface area and Ca/P ratio on the bioactivity of HA through immersion in simulated body fluid (SBF) for 3–21 days. Structural and chemical changes were analyzed using XRD, BET, SEM–EDX, and XRF, with bioactivity assessed from XRD peak intensity at 2θ ≈ 30°, degree of crystallinity, Ca/P ratio, calcium ion concentration, and pH variation. The results show that HA maintained its crystal phase during immersion, with the degree of crystallinity varying between 82% and 96%. An initial decrease in crystallinity and peak intensity indicated early HA dissolution, followed by an increase due to apatite layer formation at intermediate immersion times. Prolonged immersion resulted in reduced crystallinity, attributed to calcium depletion and partial re-dissolution. Higher surface area accelerated calcium ion consumption and enhanced apatite formation, confirming improved bioactivity of HA in SBF

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

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⁺).

Edukasi Manajemen Keuangan dalam Praktik Arisan Berbasis Keluarga: Meningkatkan Pemahaman pada Komunitas Ikatan Keluarga: Financial Management Education in Family-Based Rotating Savings Practices: Enhancing Financial Literacy within Kinship Communities Safrizal Safrizal; Heni Sugesti; Meilinda Aggreni; Yogi Chandra; Novira Fazri Nanda
Bestari: Jurnal Pengabdian Kepada Masyarakat Vol 6 No 1 (2026): Januari 2026
Publisher : Sekolah Tinggi Keguruan dan Ilmu Pendidikan (STKIP) Melawi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46368/dpkm.v6i1.4718

Abstrak Kegiatan arisan merupakan tradisi sosial-ekonomi yang telah mengakar dalam masyarakat Indonesia, khususnya di komunitas keluarga. Arisan berpotensi menjadi media pemberdayaan ekonomi keluarga, namun praktiknya seringkali hanya bersifat konsumtif dan belum didukung oleh pemahaman manajemen keuangan yang memadai. Pengabdian ini menyasar Komunitas Ikatan Keluarga di Kelurahan Air Dingin, Kecamatan Bukit Raya, yang aktif melakukan arisan namun masih menghadapi berbagai kendala dalam pengelolaan keuangan pribadi dan usaha rumahan. Tujuan kegiatan ini adalah: (1) meningkatkan literasi dan keterampilan manajemen keuangan keluarga dan usaha kecil; (2) mendorong pemanfaatan dana arisan untuk kegiatan produktif seperti modal usaha atau tabungan; dan (3) membangun sistem pencatatan keuangan sederhana untuk anggota komunitas. Metode yang digunakan adalah Participatory Action Research (PAR) dengan pendekatan pelatihan dan pendampingan partisipatif, termasuk ceramah, simulasi, diskusi kelompok, dan refleksi. Evaluasi dilakukan melalui pre-test dan post-test serta umpan balik peserta. Dengan pendekatan yang kontekstual dan praktis, kegiatan ini diharapkan dapat menumbuhkan kesadaran finansial, meningkatkan kemampuan pengelolaan dana arisan secara produktif, dan memperkuat ketahanan ekonomi rumah tangga melalui model edukasi yang mudah direplikasi di komunitas lainnya. Kata kunci: manajemen keuangan keluarga; arisan produktif; literasi keuangan; usaha rumahan; pemberdayaan komunitas Financial Management Education in Family-Based Rotating Savings Practices: Enhancing Financial Literacy within Kinship Communities Abstract The activity of “arisan” (rotating savings and credit association) is a socio-economic tradition deeply rooted in Indonesian society, particularly within family communities. Arisan has the potential to serve as a medium for family economic empowerment; however, in practice, it often remains consumptive in nature and lacks adequate understanding of financial management. This community service program targets the Family Association Community in Air Dingin Village, Bukit Raya District, which actively conducts arisan but still faces various challenges in managing personal and home-based business finances. The objectives of this activity are: (1) to enhance family and small business financial literacy; (2) to encourage the productive use of arisan funds for activities such as business capital or savings; and (3) to develop a simple financial recording system for community members. Using a participatory approach that includes lectures, simulations, group discussions, and reflection, this activity is expected to raise financial awareness, improve the ability to manage arisan funds productively, and strengthen household economic resilience through an educational model that is practical and replicable in other communities. Keywords: family financial management; productive arisan; financial literacy; home-based business; community empowerment.

Evaluation Of The Performance Of Fatty Acid Methyl Ester (Fame) As An Alternative Solvent In Alkyd Resin-Based Paints Arya Wiranata; Bahruddin Bahruddin; Zuchra Helwani; Heni Sugesti; Yogi Chandra; Hasrul Hasrul; Trisuciati Syahwardini; Ni putu Vidya Primarista
LAVOISIER: Chemistry Education Journal Vol 5, No 1 (2026)
Publisher : UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24952/lavoisier.v5i1.20037

The use of conventional solvents in the oil paint industry often leads to volatile organic compound (VOC) emissions and toxicity, so this study aims to evaluate the potential of Fatty Acid Methyl Ester (FAME) as an environmentally friendly alternative solvent. FAME is synthesised from vegetable oil through a transesterification reaction, then formulated into alkyd resin-based paints with varying binder content (40%, 50%, and 60%) to be compared with acetone solvent. The paint performance evaluation includes tests on drying time, gloss level, hiding power, and Whiteness and Yellowness Index. The results show that FAME-based paints have a much higher gloss level (10–26 GU) than acetone (3–6 GU) because their slower evaporation rate provides optimal levelling time, though this results in much longer drying time, namely 780–819 minutes. In addition, FAME has been proven to produce better covering power and a lower Yellowness Index (1.39–4.15) than acetone (4.09–5.74). This superiority is influenced by the nature of FAME, which minimises damage to the polymer binder and uniformly disperses pigments, preventing agglomeration. Overall, FAME has great potential as a sustainable paint solvent that can improve optical and physical properties, although its formulation still requires optimisation to accelerate drying.

Literature Review: The Effect of Activated Carbon Adsorption on the Reduction of Iron (Fe) Concentrations in Peat Water Yogi Chandra; Heni Sugesti; Arya Wiranata; Abdul Rohman Wali
LAVOISIER: Chemistry Education Journal Vol 5, No 1 (2026)
Publisher : UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24952/lavoisier.v5i1.19921

Peatlands in Riau Province have great potential as a water source, but their quality often fails to meet standards due to high organic matter content and levels of heavy metals such as iron (Fe), which can pose health risks. This study aims to evaluate the effectiveness of various types of activated carbon derived from agricultural waste and biomass in reducing iron (Fe) levels in peat water through a Systematic Literature Review (SLR) based on the PRISMA 2020. A total of 8 relevant articles from the Google Scholar and ScienceDirect databases were analyzed, covering the use of materials such as empty oil palm fruit bunches, bintaro fruit shells, bamboo stalks, tofu residue, shrimp shells, corn cobs, coffee grounds, and natural zeolite. The results of the study indicate that the activation process, whether physical or chemical (using activators such as H₃PO₄, HCl, or KOH), is crucial in enhancing the porosity and surface area of activated carbon to optimize adsorption capacity. The highest iron (Fe) reduction efficiency reached 99.66% and was achieved using corn cob activated carbon activated with 0.25 M HCl at 400°C. Overall, the use of biomass waste as an adsorbent is not only effective and economical in improving peat water quality but also supports sustainable waste management.

Synthesis and Application of Coconut Shell Activated Carbon Fe3O4 Composite for Zn2+ Metal Ion Adsorption from Wastewater Wahyu Triaji Rahadianto; Heni Sugesti; Yogi Chandra
Equilibrium Journal of Chemical Engineering Vol 9, No 2 (2025): Volume 9, No 2 December 2025
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v9i2.111786

Abstract. Industrial wastewater containing heavy metals such as Zn²⁺ ions is one of the hazardous pollutants that can pose serious risks to the environment and human health. The presence of Zn²⁺ in aquatic systems at high concentrations can lead to acute toxicity, thus requiring effective and sustainable treatment methods. Adsorption has become one of the most widely developed treatment approaches due to its advantages, including high efficiency, low operational cost, and environmental friendliness. This study aims to synthesize and characterize Fe₃O₄/activated carbon composites as adsorbents for the removal of Zn²⁺ ions from wastewater. Fe₃O₄ was synthesized through a coprecipitation method using FeCl₃·6H₂O and FeSO₄·7H₂O precursors, and subsequently combined with thermally activated coconut-shell carbon to enhance surface area and adsorption capacity. The composite was characterized using X-Ray Diffraction (XRD). Adsorption tests were conducted using various composite masses 0.04 g, 0.05 g, 0.06 g, 0.07 g, and 0.08 g to examine the effect of adsorbent dosage. The best performance was obtained at an adsorbent mass of 0.08 g with an optimum contact time of 75 minutes. Under these conditions, an initial Zn²⁺ concentration of 30 ppm decreased significantly, achieving a maximum removal efficiency of 91% and 84.63% under other test conditions. These findings indicate that the Fe₃O₄/activated carbon composite exhibits high effectiveness and selectivity in adsorbing Zn²⁺ ions and holds strong potential for development as a wastewater treatment material based on renewable and environmentally friendly local resources.Keywords: Activated Carbon, Adsorption, Coconut Shell, Fe₃O₄ Composite, Zn²⁺ Ions

Evaluation Of The Performance Of Fatty Acid Methyl Ester (Fame) As An Alternative Solvent In Alkyd Resin-Based Paints Arya Wiranata; Bahruddin Bahruddin; Zuchra Helwani; Heni Sugesti; Yogi Chandra; Hasrul Hasrul; Trisuciati Syahwardini; Ni putu Vidya Primarista
LAVOISIER: Chemistry Education Journal Vol 5, No 1 (2026)
Publisher : UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24952/lavoisier.v5i1.20037

The use of conventional solvents in the oil paint industry often leads to volatile organic compound (VOC) emissions and toxicity, so this study aims to evaluate the potential of Fatty Acid Methyl Ester (FAME) as an environmentally friendly alternative solvent. FAME is synthesised from vegetable oil through a transesterification reaction, then formulated into alkyd resin-based paints with varying binder content (40%, 50%, and 60%) to be compared with acetone solvent. The paint performance evaluation includes tests on drying time, gloss level, hiding power, and Whiteness and Yellowness Index. The results show that FAME-based paints have a much higher gloss level (10–26 GU) than acetone (3–6 GU) because their slower evaporation rate provides optimal levelling time, though this results in much longer drying time, namely 780–819 minutes. In addition, FAME has been proven to produce better covering power and a lower Yellowness Index (1.39–4.15) than acetone (4.09–5.74). This superiority is influenced by the nature of FAME, which minimises damage to the polymer binder and uniformly disperses pigments, preventing agglomeration. Overall, FAME has great potential as a sustainable paint solvent that can improve optical and physical properties, although its formulation still requires optimisation to accelerate drying.

Literature Review: The Effect of Activated Carbon Adsorption on the Reduction of Iron (Fe) Concentrations in Peat Water Yogi Chandra; Heni Sugesti; Arya Wiranata; Abdul Rohman Wali
LAVOISIER: Chemistry Education Journal Vol 5, No 1 (2026)
Publisher : UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24952/lavoisier.v5i1.19921

Peatlands in Riau Province have great potential as a water source, but their quality often fails to meet standards due to high organic matter content and levels of heavy metals such as iron (Fe), which can pose health risks. This study aims to evaluate the effectiveness of various types of activated carbon derived from agricultural waste and biomass in reducing iron (Fe) levels in peat water through a Systematic Literature Review (SLR) based on the PRISMA 2020. A total of 8 relevant articles from the Google Scholar and ScienceDirect databases were analyzed, covering the use of materials such as empty oil palm fruit bunches, bintaro fruit shells, bamboo stalks, tofu residue, shrimp shells, corn cobs, coffee grounds, and natural zeolite. The results of the study indicate that the activation process, whether physical or chemical (using activators such as H₃PO₄, HCl, or KOH), is crucial in enhancing the porosity and surface area of activated carbon to optimize adsorption capacity. The highest iron (Fe) reduction efficiency reached 99.66% and was achieved using corn cob activated carbon activated with 0.25 M HCl at 400°C. Overall, the use of biomass waste as an adsorbent is not only effective and economical in improving peat water quality but also supports sustainable waste management.

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