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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Indonesian Journal of Chemistry Journal of Applied Materials and Technology Equilibrium Journal of Chemical Engineering Warta Perkaretan Jurnal Teknologi Kimia Unimal Blend Sains Jurnal Teknik Jurnal Pengabdian Kepada Masyarakat Meambo
Sugesti, Heni
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Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences

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Sintesis Biodiesel Dari Minyak Nyamplung (Calophyllum Inophyllum) Menggunakan Katalis Geopolimer: Pengaruh Konsentrasi Katalis Dan Rasio Mol Minyak:Metanol Sugesti, Heni; Saputra, Edy; Helwani, Zuchra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Biodiesel is a product of transesterification reaction fat/oil and methanol with the aid of catalyst. Catalysts is commonly used in the production of biodiesel is strong base catalysts such as NaOH and KOH which is difficult to separate from the product of the reaction because it has the same phase as the reactant. Therefore, it is necessary to develop catalyst technology in order to get the production process becomes more economical, applicable and environmentally friendly, one of the catalyst is geopolymer. Geopolymers are synthesized by reacting potassium silicate, metakaolin, and bottom ash. Geopolymers is used in transesterification reaction. The process variables are weight of oil 50 grams, stirring rate 400 rpm, reaction time 120 minutes, and temperature of 65 oC, with catalyst 2% (w/w) and mole ratio of methanol:oil 1:12. The yield of biodiesel 96.62% with density 878.3 kg/m3, viscosity 4.395 mm2/s, the acid number of 0.3575 mg-KOH/g biodiesel and the flash point 134.25 °C comply with the SNI standards (SNI 7182: 2015).Keywords: biodiesel, calophyllum inophyllum oil, geopolymer, transesterification, yield
Synthesis of ?-MnO2@Mn2O3 and ?-MnO2 nanoparticles using tartaric/maleic acid and their enhanced performance in the catalytic oxidation of pulp and paper mill wastewater Sugesti, Heni; Prawiranegara, Barata Aditya; Utama, Panca Setia; Saputra, Edy
Journal of Applied Materials and Technology Vol. 6 No. 1 (2024): September 2024
Publisher : Faculty of Engineering Universitas Riau and Applied Materials and Technology Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.6.1.30-36

Abstract

Two MnOx, namely ?-MnO2@Mn2O3 and ?-MnO2 catalyst, were successfully synthesized using two different organic acids, tartaric and maleic acid, as a reduction in the redox process of KMnO4. The obtained catalysts are used in the AOP degradation reaction for paper mill effluent. The organic content in the effluent is analogous to the COD number in the effluent. The degradation process is depicted as a decrease in the COD number. The catalyst properties were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and N2 sorption. The obtained materials were then studied for PMS activation using Oxone® as a sulfate radical source for COD removal reactions. The ?-MnO2@Mn2O3, which is compromised by Mn (IV) and Mn (II, III), by using 0.3 gL-1 ?-MnO2@Mn2O3 has the best efficiency with almost 75% COD removal, higher than the ?-MnO2 catalyst. The activation energy of the ?-MnO2@Mn2O3 is measured up to 11.4 kJ mol-1.
PENGARUH VARIASI MASSA BENTONIT DAN SUHU PEMANASAN TERHADAP EFEKTIVITAS PENJERNIHAN MINYAK JELANTAH SECARA FISIKA DAN KIMIA Maranggi, Isma Uly; Rahadianto, Wahyu Triaji; Chandra, Yogi; Sugesti, Heni
Jurnal Teknologi Kimia Unimal Vol. 14 No. 1 (2025): Jurnal Teknologi Kimia Unimal - May 2025
Publisher : Chemical Engineering Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jtku.v14i1.21731

Abstract

Minyak jelantah merupakan limbah rumah tangga dan industri yang berpotensi mencemari lingkungan serta membahayakan kesehatan apabila digunakan kembali tanpa proses pemurnian. Penelitian ini bertujuan untuk mengkaji efektivitas pemurnian minyak jelantah menggunakan adsorben bentonit melalui metode penjernihan fisika dan kimia, dengan memvariasikan massa bentonit dan suhu pemanasan. Proses fisika dilakukan dengan adsorpsi menggunakan bentonit dalam variasi 1-7% b/v dan suhu 30-80°C, sedangkan proses kimia menggunakan reaksi esterifikasi dengan etanol dan asam sulfat pada suhu yang sama. Hasil penelitian menunjukkan bahwa pemurnian fisika paling efektif pada suhu 80°C dan konsentrasi bentonit 5%, menghasilkan penurunan kadar asam lemak bebas (ALB) hingga 0,08%. Sementara itu, pemurnian kimia efektif menurunkan ALB hingga 0,18% pada suhu 80°C. Kedua metode mampu memperbaiki kejernihan dan menurunkan kadar ALB secara signifikan, namun belum sepenuhnya menghilangkan aroma bau tidak sedap. Penelitian ini menunjukkan bahwa bentonit merupakan adsorben yang efektif untuk pemurnian minyak jelantah, dan pemilihan kondisi operasi yang optimal sangat berpengaruh terhadap hasil akhir.
Workshop Pengenalan Bahan Kimia Berbahaya dan Penanganannya di Laboratorium Kimia SMA Negeri 6 Tualang Sugesti, Heni; Chandra, Yogi; Yola Bertilsya Hendri; Lisa Legawati; Salma Liska
Jurnal Pengabdian Meambo Vol. 4 No. 2 (2025): Jurnal Pengabdian Kepada Masyarakat MEAMBO
Publisher : PROMISE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56742/jpm.v4i2.137

Abstract

Kurangnya pengetahuan dan pemahaman mengenai penanganan bahan kimia berbahaya dan keselamatan berkerja di laboratorium dapat mengakibatkan terjadinya kecelakaan saat praktikum. Kegiatan pengabdian ini bertujuan untuk meningkatkan pengetahuan dan pemahaman siswa serta guru mata pelajaran kimia terhadap bahaya penggunaan bahan kimia berbahaya di laboratorium sekolah serta cara penanganannya yang cepat dan tepat. Workshop ini dilaksanakan di SMA Negeri 6 Tualang pada bulan April 2025 dengan melibatkan guru mata pelajaran Kimia dan siswa kelas XI sebanyak 38 orang. Metode yang digunakan meliputi tahapan persiapan dengan melakukan koordinasi awal dengan pihak sekolah untuk memperoleh informasi terkait kondisi laboratorium, penyampaian materi melalui presentasi interaktif, diskusi kelompok, demonstrasi langsung mengenai identifikasi bahan kimia berbahaya, prosedur penyimpanan, penggunaan alat pelindung diri (APD), penanganan limbah dan simulasi ketika terjadi kecelakaan kerja di laboratorium serta tahapan evaluasi berupa observasi langsung dan pemberian kuesioner berupa pre test dan post test. Hasil dan kesimpulan kegiatan ini menunjukkan adanya peningkatan pengetahuan dan pemahaman peserta mengenai klasifikasi-klasifikasi bahan kimia berbahaya, simbol bahaya, dan prosedur keselamatan kerja di laboratorium. Hal ini ditunjukkan melalui peningkatan signifikan nilai rata-rata dari pre-test ke post-test dan kegiatan ini juga berkontribusi dalam menumbuhkan budaya keselamatan di lingkungan sekolah serta memperkuat kesiapan siswa dalam mengikuti praktikum kimia dengan lebih bertanggung jawab.
Photo-Fenton of Dyes Degradation Using Covalent Triazine Frameworks: Toward Industrial Wastewater Treatment Applications Prawiranegara, Barata Aditya; Sugesti, Heni; Suhendri; Abid, Hussein Rasool; Azhar, Muhammad Rizwan; Rada, Zana Hassan; Manawan, Maykel; Utama, Panca Setia
Journal of Applied Materials and Technology Vol. 5 No. 2 (2024): March 2024
Publisher : Faculty of Engineering Universitas Riau and Applied Materials and Technology Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.5.2.77-85

Abstract

A Covalent Triazine Framework (CTF-1) and carbon nanospheres (CS) were synthesized to develop a porous, thermally stable, and efficient photocatalyst for dye degradation in wastewater treatment applications. The synthesized composite material exhibited a high surface area exceeding 400 m²/g, a well-defined mesoporous structure, and excellent optical properties, including strong light absorption extending up to 550 nm and a moderate band gap of approximately 2.8 eV. These characteristics promote effective visible light-driven photocatalysis. The photocatalytic performance was assessed by degrading methylene blue (MB) as a model organic dye pollutant under photo-Fenton conditions. The system demonstrated high efficiency, with over 90% of the dye removed within 120 minutes of irradiation. The degradation followed pseudo-first-order kinetics, confirming the photocatalytic nature of the reaction. Parameter studies indicated that hydroxyl radicals (•OH) were the dominant reactive species responsible for dye degradation. Moreover, CTF-1 retained its photocatalytic activity and structural integrity over multiple reuse cycles, showcasing excellent reusability and stability. The integration of high surface area for dye adsorption, efficient photoactivation under visible light, and robust radical generation synergistically contributed to the enhanced degradation performance. The study highlights the promising role of CTF-1 and its composites as multifunctional materials for advanced oxidation processes. Given its effectiveness, durability, and environmental compatibility, CTF-1 presents a sustainable and scalable solution for the treatment of dye-laden industrial wastewater. This work contributes to the development of next-generation photocatalysts aimed at addressing global challenges in water pollution and environmental remediation.
Pemanfaatan Karbon Magnetit dari Tempurung Kelapa sebagai Adsorben Ion Seng (II) dalam Larutan Artifisial Sugesti, Heni; Chandra, Yogi; Rahadianto, Wahyu Triaji
Blend Sains Jurnal Teknik Vol. 4 No. 3 (2026): Edisi Januari
Publisher : Ilmu Bersama Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56211/blendsains.v4i3.1532

Abstract

Penelitian ini bertujuan untuk mengevaluasi kinerja adsorpsi karbon magnetit sebagai adsorben ion Seng (Zn²⁺) dalam larutan berair menggunakan metode batch. Karbon magnetik dari tempurung kelapa dianalisa karakterisasi menggunakan FTIR dan SEM. Hasil karakterisasi menggunakan FTIR mengonfirmasi keberhasilan pembentukan komposit melalui munculnya puncak serapan khas ikatan Fe-O pada bilangan gelombang di bawah 600 cm⁻¹. Selain itu, teridentifikasi gugus fungsi aktif hidroksil (O-H) dan karbonil (C=O) yang berperan sebagai situs aktif pengikatan logam. Analisis SEM memperlihatkan morfologi permukaan yang berpori dengan distribusi partikel magnetit pada matriks karbon aktif, yang memberikan sifat pemisahan magnetik yang cepat. Adsorben karbon magnetit disintesis melalui teknik kopresipitasi dan diaplikasikan untuk menyisihkan ion Zn²⁺ dengan variasi konsentrasi awal 5, 15, dan 25 mg/L. Proses adsorpsi dilakukan pada suhu 25 °C dengan dosis adsorben 0,08 g dalam 100 mL larutan dan waktu kontak hingga 75 menit. Konsentrasi sisa Zn²⁺ dianalisis menggunakan instrumen flame Atomic Absorption Spectroscopy (AAS) untuk menentukan efisiensi penyisihan (% removal). Hasil penelitian menunjukkan bahwa efisiensi adsorpsi meningkat seiring bertambahnya waktu kontak dan konsentrasi awal Zn²⁺. Pada waktu kontak 75 menit, persentase removal 90% untuk 25 mg/L. Peningkatan efisiensi adsorpsi pada konsentrasi yang lebih tinggi menunjukkan adanya pengaruh gradien konsentrasi sebagai gaya pendorong utama proses adsorpsi. Secara keseluruhan, karbon magnetit menunjukkan kinerja adsorpsi yang baik terhadap ion Zn²⁺ dan berpotensi diaplikasikan sebagai adsorben magnetik yang efektif dalam pengolahan limbah cair yang mengandung logam berat.
PENGARUH FULL ACRYLIC DAN STYRENE ACRYLIC TERHADAP KINERJA LATEKS KARET ALAM SEBAGAI BINDER PADA APLIKASI CAT EMULSI Wiranata, Arya; Sugesti, Heni; Syahwardini, Trisuciati; Pakpahan, Cindy; Rosmawati, Putri; Nurhidayah, Nurhidayah; Bahruddin, Bahruddin
Warta Perkaretan Vol. 44 No. 2 (2025): Volume 44, Nomor 2, Tahun 2025
Publisher : Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/ppk.wp.v44i2.1223

Abstract

Permintaan cat dalam industri konstruksi terus meningkat, terutama cat emulsi berbasis air yang bergantung pada kualitas bahan pengikat (binder) sebagai komponen utama. Indonesia masih mengandalkan impor binder sintetis, sehingga diperlukan alternatif lokal yang ramah lingkungan. Lateks karet alam merupakan kandidat potensial, namun memiliki kelemahan dalam ketahanan cuaca dan waktu pengeringan. Penelitian ini mengembangkan binder berbasis lateks karet alam yang dimodifikasi dengan resin akrilik (full acrylic dan styrene acrylic) untuk meningkatkan daya rekat, ketahanan abrasi, dan stabilitas cuaca. Modifikasi dilakukan melalui proses pencangkokan menggunakan benzoyl peroxide, SLS, sodium sulfit, dan polipropilen glikol pada suhu 85°C selama 60 menit. Binder hasil modifikasi kemudian dicampur ke dalam cat emulsi dan diuji menggunakan FT-IR spectroscopy, uji ketahanan gosok (scrub) dan abrasi (abrasion) (mengacu pada ASTM D2486 method A), serta pengukuran sudut kontak (contact angle). Hasil menunjukkan peningkatan signifikan dalam performa cat, terutama pada sampel NRL-FA(70:30) dengan kadar binder 15%, yang mampu bertahan hingga 5.500 siklus dan memiliki sudut kontak 87°. Temuan ini menunjukkan bahwa lateks karet alam termodifikasi akrilik berpotensi menjadi alternatif binder berkinerja tinggi untuk aplikasi cat emulsi interior dan eksterior.
Synthesis of Fe3O4/Hydroxyapatite Nanocomposites: Structural, Surface, and Magnetic Characterization Fadli, Ahmad; Prabowo, Agung; Drastinawati, Drastinawati; Wandika Putra, Bima; Sugesti, Heni; Puspasari, Febriyati
Indonesian Journal of Chemistry Vol 26, No 2 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.107697

Abstract

Magnetite/hydroxyapatite (Fe3O4/HA) nanocomposites are promising materials for biomedical applications, particularly in targeted drug delivery. This study investigates the effects of hydrothermal reaction time and FeCl3 precursor concentration on the structural, morphological, and magnetic properties of Fe3O4/HA composite powders synthesized via a one-pot hydrothermal method. The resulting composites exhibit biphasic structures comprising magnetite (cubic phase) and hydroxyapatite (hexagonal phase) crystallites, with average sizes ranging from 22 to 30 nm. Both increased reaction time and FeCl3 concentration contributed to the growth of crystal size. A notable enhancement in specific surface area was observed, increasing from 48.21 to 67.41 m2/g as FeCl3 concentration decreased from 0.15 to 0.05 M at a fixed reaction time of 15 h. Magnetic characterization revealed that the composites exhibited superparamagnetic behavior, with the highest saturation magnetization (Ms) reaching 17.27 emu/g. These results demonstrate that tuning synthesis parameters can optimize the structural and magnetic properties of Fe3O4/HA nanocomposites, making them strong candidates for use in controlled drug delivery systems.
Synthesis and Application of Coconut Shell Activated Carbon Fe3O4 Composite for Zn2+ Metal Ion Adsorption from Wastewater Rahadianto, Wahyu Triaji; Sugesti, Heni; Chandra, Yogi
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

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
Co-Authors Abid, Hussein Rasool Ahmad Fadli Azhar, Muhammad Rizwan Bahruddin Bahruddin Chandra, Yogi Drastinawati Drastinawati, Drastinawati Hendri, Yola Bertilsya Lisa Legawati Manawan, Maykel Maranggi, Isma Uly Nurhidayah Nurhidayah Nurwijayanti Pakpahan, Cindy Prabowo, Agung Prawiranegara, Barata Aditya Puspasari, Febriyati Rada, Zana Hassan Rahadianto Wahyu Triaji Rosmawati, Putri Salma Liska Suhendri Syahwardini, Trisuciati Utama, Panca Setia Wandika Putra, Bima Wiranata, Arya Zuchra Helwani, Zuchra