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Synthesis of Spherical Nanostructured g-Al2O3 Particles using Cetyltrimethylammonium Bromide (CTAB) Reverse Micelle Templating Didi Prasetyo Benu; Veinardi Suendo; Rino Rakhmata Mukti; Erna Febriyanti; Fry Voni Steky; Damar Rastri Adhika; Viny Veronika Tanuwijaya; Ashari Budi Nugraha
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (December 2019)
Publisher : Department of Chemical Engineering - Diponegoro University

We demonstrated the synthesis of spherical nanostructured g-Al2O3 using reverse micelle templating to enhance the surface area and reactant accessibility. Three different surfactants were used in this study: benzalkonium chloride (BZK), sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB). We obtained spherical nanostructured particles only using CTAB that form a reverse micelle emulsion. The particles have wide size distribution with an average size of 2.54 mm. The spherical particles consist of nanoplate crystallites with size 20-40 nm randomly arranged forming intercrystallite spaces. The crystalline phase of as-synthesized and calcined particles was boehmite and g-Al2O3, respectively as determined by XRD analysis. Here, the preserved particle morphology during boehmite to g-Al2O3 transformation opens a facile route to synthesize g-Al2O3 particles with complex morphology. The specific surface area of synthesized particles is 201 m2/g, which is around five times higher than the conventional g-Al2O3 (Aldrich 544833). Spherical nanostructured g-Al2O3 provides wide potential applications in catalysis due to its high density closed packed structure, large surface area, and high accessibility.

bcl Morphology Formation Strategy on Nanostructured Titania via Alkaline Hydrothermal Treatment Fry Voni Steky; Veinardi Suendo; Rino Rakhmata Mukti; Didi Prasetyo Benu; Muhammad Reza; Damar Rastri Adhika; Viny Veronika Tanuwijaya; Ashari Budi Nugraha
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (December 2019)
Publisher : Department of Chemical Engineering - Diponegoro University

Titanium dioxide (TiO2) is a semiconductor material that plays an important role in photocatalysis. Bicontinuous concentric lamellar (bcl) is an interesting morphology with an open channel pore structure that has been successfully synthesized on silica-based materials. If bcl morphology can be applied in TiO2 system, then many surface properties of TiO2 can be enhanced, i.e. photocatalytic activity. A simple and effective strategy has been demonstrated to transform aggregated and spherical TiO2 particles to bcl morphology via alkaline hydrothermal route. Alkaline hydrothermal treatment successfully transforms TiO2 particle surface to have bcl morphology through swelling with ammonia then followed by phase segregation process. We proposed this strategy as a general pathway to transform the particle surface with any shape to have bcl morphology.

Pencegahan Penularan COVID-19 Melalui Penguatan Perilaku Siswa dan Guru SDK Seoam 1 Eban Kecamatan Miomaffo Barat Grandianus Seda Mada; Dicky Frengky Hanas; Lukas Pardosi; Welsiliana Welsiliana; Didi Prasetyo Benu; Marselina Theresia Djue Tea; Dira Asri Pramita; Desta Gloria Siahaan
Bakti Cendana Vol 4 No 2 (2021): Bakti Cendana: Jurnal Pengabdian Masyarakat
Publisher : LPPM Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/bc.4.2.2021.1-7

Salah satu alasan sekolah masih belum dibuka secara penuh hingga kini adalah potensi terjadinya penularan melalui siswa-siswa yang berkumpul dalam waktu lama di ruang tertutup. Beberapa penelitian menunjukan bahwa menutup sekolah akan memperlambat perkembangan infeksi. Namun, langkah-langkah yang lebih luas seperti social distancing, terbukti memiliki efek pengendalian yang lebih besar. Risiko dari pembukaan sekolah akan bergantung pada seberapa baik sekolah mengendalikan penularan, misalnya dengan penggunaan masker dan membatasi okupansi. Oleh karena itu, perlu dilakukan kembali penguatan perilaku untuk mencegah penularan penyakit Covid-19 kepada siswa dan guru. Bentuk Kegiatan Pengabdian yang dilakukan adalah pembagian masker dan edukasi mengenai dampak penyakit Covid-19 kepada siswa dan guru SDK Seoam 1 Eban, Kefamenanu. Hasil dari kegiatan ini adalah para siswa dan guru dapat melakukan protokol kesehatan secara sadar dan benar yaitu melalui 3M: memakai masker, menjaga jarak dan menghindari kerumunan, serta mencuci tangan pakai sabun. Kata Kunci: Covid-19, Protokol Kesehatan, Guru dan Siswa

1H and 13C NMR Study of Oligosuccinimide Prepared by Thermal Condensation and Evaluation of Its Scale Inhibition Muhamad Jalil Baari; Megawati Megawati; Didi Prasetyo Benu
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 7, No 3 (2022): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v7i3.65666

The presence of scale is a serious problem in the petroleum industry, and some efforts should be made to control scale formation. Oligosuccinimide (OSI) is an oligomer with several repeating units of succinimide. The structure of the OSI main chain and end groups has never been comprehensively analyzed. Meanwhile, OSI is potentially a scale inhibitor due to chelating properties, high polarity, and high solubility. This study investigates the molecular structure of oligosuccinimide, focusing on the main chain and end groups. Synthesis was carried out by thermal condensation between maleic anhydride and ammonium carbonate using a 1H and 13C NMR spectroscope equipped with Distortionless Enhancement by Polarization Transfer 135, Heteronuclear Multiple Quantum Coherence, and Single Quantum Coherence. The NMR analysis results detected the presence of the main chain and several synthesized OSI end groups, such as the amino, succinimide, and maleimide end groups. However, the dicarboxylic acid end group and other irregular structures, as in polysuccinimide (various synthesis methods), were not identified. It confirmed that our thermal condensation method produced OSI with less irregular structures than previous methods. Evaluation of OSI as CaCO3 and CaSO4 scales inhibitor showed reasonably good performance in very small concentrations. The inhibition efficiency was 73.20% for the CaCO3 scale with 10 mg.L-1 and 55.29% for the CaSO4 scale with 10 mg.L-1 inhibitor concentration. Analysis of thermal stability informed OSI has good thermal stability because it started to be degraded at 353.38 °C.

Synthesis of Spherical Nanostructured g-Al2O3 Particles using Cetyltrimethylammonium Bromide (CTAB) Reverse Micelle Templating Didi Prasetyo Benu; Veinardi Suendo; Rino Rakhmata Mukti; Erna Febriyanti; Fry Voni Steky; Damar Rastri Adhika; Viny Veronika Tanuwijaya; Ashari Budi Nugraha
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (December 2019)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.3.3855.542-550

We demonstrated the synthesis of spherical nanostructured g-Al2O3 using reverse micelle templating to enhance the surface area and reactant accessibility. Three different surfactants were used in this study: benzalkonium chloride (BZK), sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB). We obtained spherical nanostructured particles only using CTAB that form a reverse micelle emulsion. The particles have wide size distribution with an average size of 2.54 mm. The spherical particles consist of nanoplate crystallites with size 20-40 nm randomly arranged forming intercrystallite spaces. The crystalline phase of as-synthesized and calcined particles was boehmite and g-Al2O3, respectively as determined by XRD analysis. Here, the preserved particle morphology during boehmite to g-Al2O3 transformation opens a facile route to synthesize g-Al2O3 particles with complex morphology. The specific surface area of synthesized particles is 201 m2/g, which is around five times higher than the conventional g-Al2O3 (Aldrich 544833). Spherical nanostructured g-Al2O3 provides wide potential applications in catalysis due to its high density closed packed structure, large surface area, and high accessibility.

bcl Morphology Formation Strategy on Nanostructured Titania via Alkaline Hydrothermal Treatment Fry Voni Steky; Veinardi Suendo; Rino Rakhmata Mukti; Didi Prasetyo Benu; Muhammad Reza; Damar Rastri Adhika; Viny Veronika Tanuwijaya; Ashari Budi Nugraha
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (December 2019)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.3.3853.513-520

Titanium dioxide (TiO2) is a semiconductor material that plays an important role in photocatalysis. Bicontinuous concentric lamellar (bcl) is an interesting morphology with an open channel pore structure that has been successfully synthesized on silica-based materials. If bcl morphology can be applied in TiO2 system, then many surface properties of TiO2 can be enhanced, i.e. photocatalytic activity. A simple and effective strategy has been demonstrated to transform aggregated and spherical TiO2 particles to bcl morphology via alkaline hydrothermal route. Alkaline hydrothermal treatment successfully transforms TiO2 particle surface to have bcl morphology through swelling with ammonia then followed by phase segregation process. We proposed this strategy as a general pathway to transform the particle surface with any shape to have bcl morphology.

SINTESIS ZnO BERSTRUKTUR NANO MENGGUNAKAN CAMPURAN PELARUT AIR-ETILEN GLIKOL DAN KARAKTERISASI STRUKTUR, MORFOLOGI DAN ENERGI CELAH PITA PARTIKEL Christanti, Cindy Claudia; Benu, Didi Prasetyo
Journal of Chemical Science and Application Vol. 2 No. 2 (2024)
Publisher : Program Studi Kimia Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jcsa.v2i2.8757

Seng oksida (ZnO) adalah salah satu material semikonduktor yang banyak diaplikasikan dalam berbagai bidang, salah satunya adalah sebagai fotokatalis. Karakteristik penting untuk menunjang aplikasi ZnO sebagai fotokatalis adalah luas permukaan dan densitas cacat kristal. Penelitian ini bertujuan untuk meningkatkan potensinya sebagai fotokatalis dengan cara mengontrol morfologi dan densitas cacat kristal melalui sintesis menggunakan campuran pelarut air-etilen glikol. Struktur partikel hasil sintesis dikarakterisasi menggunakan difraksi sinar x (XRD), morfologinya diamati menggunakan Field Emission Scanning Electron Microscope (FESEM), dan energi celah pita partikel ditentukan menggunakan persamaan Kubelka-Munk berdasarkan spektrum absorpsi yang diukur manggunakan UV-Vis Diffuse Reflectance Spectroscopy (DRS). Hasil penelitian menunjukkan bahwa ZnO berstuktur kristal wurtzite dengan morfologi tiga dimensi berstruktur nano berhasil disintesis menggunakan campuran pelarut air-etilen glikol dengan keberadaan urea sebagai agen penghidrolisis. Etilen glikol berperan sebagai capping agent yang teradsorpsi ke permukaan kristal ZnO, sehingga mengarahkan petumbuhan kristal anisotropik dan menghasilkan ZnO berstruktur nano. Meskipun ZnO hasil sintesis memiliki energi celah pita lebar (3,16 eV), keberadaan cacat kristal dapat meningkatkan performanya dalam berbagai aplikasi jika dibandingkan dengan ZnO konvensional. Karakteristik material yang dihasilkan menunjukkan bahwa partikel ZnO hasil sintesis berpotensi memiliki kinerja unggul dalam aplikasinya sebagai fotokatalis.

Bioremediasi Amoniak Feses Ayam Menggunakan Nitrobacter-Nitrosomonas di Kelompok Wanita Tani Nunapa Jaya, Kabupaten Timor Tengah Utara, Nusa Tenggara Timur Gelyaman, Gebhardus Djugian; Kolo, Sefrinus Maria Dolfi; Benu, Didi Prasetyo; Christanti, Cindy Claudia; Edi, Eduardus; Batu, Matius Stefanus; Mere, Janrigo Klaumegio; Adu, Risna Erni Yati; Talan, Veronika Sofia Jaquelin
Jurnal Inovasi Pengabdian dan Pemberdayaan Masyarakat Vol 5 No 1 (2025): JIPPM - Juni 2025
Publisher : CV Firmos

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54082/jippm.799

Ketergantungan petani di Kabupaten Timor Tengah Utara terhadap pupuk urea sangat tinggi, namun ketersediaannya terbatas. Selain itu, pemahaman petani dalam mengolah bahan mentah menjadi pupuk substituen urea masih rendah sehingga meningkatkan kelangkaan pupuk dan menurunkan produktivitas petani. Pupuk urea dapat digantikan dengan nitrat hasil olahan amoniak dari limbah feses ayam broiler melalui teknologi bioremediasi dengan bakteri Nitrobacter dan Nitrosomonas. Tujuan pengabdian ini adalah memperkenalkan teknologi bioremediasi Nitrobacter-Nitrosomonas kepada Kelompok Wanita Tani Nunapa Jaya Kefamenanu. Metode yang digunakan meliputi survei, sosialisasi, praktik, dan evaluasi pada 12 responden dengan analisis deskriptif. Pengabdian dilaksanakan pada bulan maret – mei 2025. Hasil kegiatan menunjukkan bahwa terjadi persentase perubahan pengetahuan terhadap pemanfaatan Nitrobacter dan Nitrosomonas yaitu 100% responden mengenal teknologi bioremediasi. Persentase perubahan pengetahuan responden terhadap dampak negatif tingginya kadar amonia bagi lingkungan adalah 83%. Perubahan responden yang mengetahui teknik pengolahan feses ayam menjadi pupuk adalah 67%. Perubahan pengetahuan terhadap jenis dekomposer feses ayam sebanyak 67%. Perubahan presentasi intensitas Odor (sangat tinggi menjadi tidak ada) feses ayam menurut responden adalah sebanyak sebesar 91,67%. Dengan demikian, dapat disimpulkan bahwa kegiatan ini berkontribusi penting dalam mengatasi kelangkaan pupuk di daerah pertanian dengan pendekatan inovatif, ramah lingkungan. Implikasi dari kegiatan ini adalah pemberdayaan petani secara langsung, potensi substitusi urea, pengolahan limbah ternak, pengembangan teknologi lokal dan dampak positif terhadap lingkungan.

Low-Temperature Synthesis of ZnO Nanoparticles Using a Water-Methanol Solvent for Rhodamine B Photodegradation Christanti, Cindy Claudia; Benu, Didi Prasetyo
Jurnal Beta Kimia Vol 5 No 1 (2025): Volume 5 Number 1, May 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v5i1.21305

Water pollution caused by organic dyes represents a significant environmental issue demanding effective treatment methods. This study aimed to synthesize zinc oxide (ZnO) nanoparticles at a low temperature using a water-methanol mixed solvent and evaluate their photocatalytic potential for the degradation of Rhodamine B (RhB). ZnO nanoparticles were successfully synthesized at a low temperature of 60°C utilizing a mixture of water and methanol as the solvent. Characterization results from X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) confirmed that the synthesized material consists of wurtzite structure ZnO nanoparticles. Analysis using UV-Vis Diffuse Reflectance Spectroscopy (DRS) showed that the material possesses a band gap energy of 3.16 eV. The as-synthesized ZnO nanoparticles exhibited effective photocatalytic activity for the degradation of the model pollutant RhB under UV light irradiation. A high photodegradation efficiency of 95.58% was achieved within 45 minutes, with a first-order reaction rate constant (k) of 0.0571 min⁻¹. This low-temperature synthesis method based on the water-methanol solvent mixture proved to be a promising and efficient route for producing active ZnO photocatalysts potentially applicable in treating organic dye-contaminated wastewater.

Education of making natural hand sanitizers to the community of Haulasi Village, North Central Timor Regency Adu, Risna Erni Yati; Tnunay, Ite Morina Yostianti; Benu, Didi Prasetyo; Makin, Florian M. P. R.; Hanas, Dicky; Kamaluddin
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 5 No. 2 (2020): ABDIMAS TALENTA : Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

The availability of hand sanitizers, which is one of the Covid-19 prevention media, is becoming scarce and expensive due to their increasing use, making them difficult to reach by the public. Therefore we need another source of active ingredients that more easily obtained, available in abundant quantities and more economically to be used as a substtitute for hand sanitizer raw materials by the public. Potential alternantive material to be used as raw material for hand sanitizer is betel leaves, however, public knowledge about the benefits and methods of processing betel leaves into hand sanitizer is very limited. Therefore, education about the use of betel leaves into natural hand sanitizer products to rural communitties needs to be done to increase peopleâ€™s insight about making natural hand sanitizer and increase public awareness in maintaining hygiene by providing and using similar products.

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