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All Journal CHEMISTRY PROGRESS Indonesian Journal of Chemical Science Science and Technology Indonesia Indonesian Journal of Chemistry Communications in Science and Technology IJEMS (Indonesian Journal of Environmental Management and Sustainability) Riau Journal of Empowerment Molekul: Jurnal Ilmiah Kimia Sains dan Matematika SRIWIJAYA JOURNAL OF ENVIRONMENT Makara Journal of Science Makara Journal of Technology Bulletin of Chemical Reaction Engineering & Catalysis Indonesian Journal of Material Research Prosiding Seminar Nasional Unimus
Risfidian Mohadi
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Kampus UNSRI Indralaya, Jl. Palembang Prabumulih Km 32 Ogan Ilir 30662, South Sumatera
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Materials Science & Nanotechnology Mathematics Mechanical Engineering Nursing Physics Public Health Social Sciences

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Pembuatan Pasta Gigi Pembawa Infusa Daun Sirih dan Sirsak Pada Masyarakat Desa Ulak Kerbau Ogan Ilir SUMSEL Mardiyanto, Mardiyanto; Agustiarini, Vitry; Wardhana, Singgih Tri; Mohadi, Risfidian
Prosiding Seminar Nasional Unimus Vol 7 (2024): Transformasi Teknologi Menuju Indonesia Sehat dan Pencapaian Sustainable Development G
Publisher : Universitas Muhammadiyah Semarang

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Abstract

Publikasi hasil pengabdian kepada masyarakat (PPM) ini bertujuan untuk meningkatkan pengetahuanmasyarakat terhadap pemanfaatan dan pembuatan sediaan pasta gigi mengandung herbal lokal untukkesehatan gigi dan mulut. Kegiatan PPM merupakan program pemerintah dalam upaya pengembangandesa di sekitar kampus sebagai dukungan untuk keberlanjutan pembangunan. Desa Ulak Kerbaumerupakan desa yang berada di sekitar kampus Universitas Sriwijaya (Unsri). Potensi sumberdayamanusia dan alam di Desa Ulak Kerbau perlu dikembangkan dengan menerapkan iptek oleh dosen-dosendi Unsri. Metode yang digunakan untuk penyampaian ipteks ini adalah berupa presentasi, demonstrasidan tanya-jawab. Hasil dari kegiatan adalah terjadinya peningkatan pemahaman terhadap penyakit infeksigigi dan mulut serta cara penanggulangannya, terjadinya peningkatan animo untuk memanfaatkan daunsirih dan daun sirsak, serta peningkatan keterampilan dalam membuat sediaan pasta gigi mengandung airrebusan daun sirih dan daun sirsak dengan serangkaian evaluasi sediaan terutama uji stabilitas sediaan. Kata Kunci: Pasta-gigi, Sediaan, Sirih, Sirsak, Stabilitas
Peningkatan Pemahaman Pencegahan Infeksi Mulut dan Gigi serta Pembuatan Sediaan Gargarisma di Desa Ulak Kerbau Ogan Ilir Sumatera Selatan Mohadi, Risfidian; Mardiyanto, Mardiyanto; Apriani, Elsa F.; Kamal, Mustafa
Prosiding Seminar Nasional Unimus Vol 7 (2024): Transformasi Teknologi Menuju Indonesia Sehat dan Pencapaian Sustainable Development G
Publisher : Universitas Muhammadiyah Semarang

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Abstract

Makalah ilmiah hasil kegiatan pengabdian kepada masyarakat (PPM) ini memberikan informasi kepadamasyarakat cara mencegah infeksi mulut dan gigi juga untuk meningkatkan keterampilan masyarakatdalam membuat sediaan gargarisma. Kegiatan pengabdian adalah salah satu program jurusan farmasiFMIPA Unsri dalam pemanfaatan dan pembuatan sediaan yang mengandung herbal lokal untukmencegah penyakit infeksi salah satunya adalah infeksi mulut dan gigi. Desa Ulak Kerbau terletak dekatdengan kampus Unsri. Dosen FMIPA UNSRI unggul dalam meneliti di laboratorium dan salah satu hasilpenelitian ditargetkan dapat diaplikasikan untuk kegiatan pengabdian kepada masyarakat. Metode yangdigunakan pada kegiatan pengabdian ini adalah presentasi, demonstrasi, dan tanya-jawab. Hasil darikegiatan adalah terjadinya peningkatan pengetahuan masyarakat terhadap penyakit infeksi gigi dan mulutserta cara pencegahannya, terjadinya peningkatan kesadaran untuk memanfaatkan bahan obat alam, sertapeningkatan keterampilan dalam membuat sediaan gargarisma mengandung air rebusan daun sirih dandaun sirsak yang menghasilkan sediaan yang dapat digunakan untuk mulut dalam hal pH, viskositas, danorganoleptic. Stabilitas sediaan secara mekanik adalah baik tetapi dengan meningkatnya suhu dapatmenyebabkan perubahan pH, warna dan kejernihan.Kata Kunci: Gargarisma, Infeksi, mulut, Sirih, Sirsak.
Synthesis, Characterization, and Catalytic Performance of H₃[α-PMo₁₂O₄₀]·nH₂O-TiO₂ in Cyclohexane Oxidation Lingga, Fitra Wahyuni; Jefri, Jefri; Mohadi, Risfidian; Lesbani, Aldes
Indonesian Journal of Material Research Vol. 3 No. 1 (2025): March
Publisher : Magister Program of Material Science Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijmr.20253153

Abstract

This study aims to synthesize and characterize the H₃[α-PMo₁₂O₄₀].nH₂O-TiO₂ composite as a heterogeneous catalyst for cyclohexane oxidation using H₂O₂. FT-IR and XRD characterization showed the interaction between POM and TiO₂, with an increase in TiO₂ ratio leading to a decrease in POM crystallinity. Reaction optimization showed that the POM-1.00TiO₂ catalyst gave the highest conversion of 99.95% at 80°C, 2 hours reaction time, 3 mL H₂O₂ volume, and 0.1 g catalyst mass. GC analysis confirmed the formation of cyclohexanol and cyclohexanone, with the optimized conditions resulting in a balanced selectivity of 35.51% for cyclohexanol and 34.69% for cyclohexanone, demonstrating the catalyst's effectiveness in cyclohexane oxidation.
Hydrochar Derived from Pennisetum setaceum for Congo Red Adsorption: A Low-Cost Bioadsorbent from Invasive Grass Karvenia, Icha Aulia; Royani, Idha; Mohadi, Risfidian
Indonesian Journal of Environmental Management and Sustainability Vol. 9 No. 3 (2025): September
Publisher : Magister Program of Material Science, Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2025.9.3.156-170

Abstract

This study investigates the adsorption performance of hydrochar derived from Pennisetum setaceum (PS) through hydrothermal treatment at 250°C for various reaction times (1-4 hours) for the removal of Congo Red (CR) dye from aqueous solutions. The materials were characterized using FTIR, XRD, SEM–EDS, BET, and pHpzc analysis to evaluate changes in functional groups, crystallinity, morphology, elemental composition, and surface charge. FTIR spectra confirmed the presence of oxygen-containing functional groups (O-H, C=O, C-O-C, C-O), while XRD patterns indicated a transition from amorphous to partially crystalline structures, followed by re-amorphization at longer reaction times. SEM images revealed a progressive increase in porosity and surface roughness, accompanied by an increase in carbon content, as shown by EDS. BET analysis of HPS-4 further confirmed its mesoporous structure with a surface area of 9.316 m2/g, which supports enhanced adsorption performance. Adsorption experiments demonstrated that the optimum pH for CR removal by HPS-4 was 5, with a maximum capacity of 51.674 ± 5.468 mg/g. Kinetic studies followed the pseudo-first-order model, and equilibrium data fitted well with the Langmuir isotherm, indicating monolayer adsorption. Thermodynamic analysis showed the process was spontaneous and exothermic (?H° = ?44.07 kJ/mol). The proposed adsorption mechanism involves a combination of electrostatic attraction, hydrogen bonding, and ?–? interactions between CR molecules and the aromatic structure of hydrochar. However, regeneration tests indicated a significant decrease in efficiency after the third cycle. These findings suggest that hydrochar from Pennisetum setaceum is a promising adsorbent for anionic dye removal, with optimal performance achieved under controlled hydrothermal conditions.
Development of Nanofiber Made of Nanocellulose with Oil Encapsulation of Eucalyptus sp. Sari, Wida Fatma; Haryati, Sri; Mohadi, Risfidian
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1074-1086

Abstract

The amalgamation of natural polymers derived from lignocellulosic waste with synthetic polymers is a potential avenue for producing high-value products through nanotechnological innovations. Nanofibers are a significant application of nanotechnology and is now being explored as an alternative method for treating lignocellulosic waste. Nanofiber is a fiber generated by an electrospinning device. Cellulose obtained from lignocellulose can be transformed into valuable products, including nanocellulose. This project entails the synthesis of nanofibers via the combination of natural and synthetic polymers, an innovative approach in the field. Natural polymers are derived from alginate and nanocellulose, whilst synthetic polymers are produced from Poly Vinyl Alcohol (PVA). This study employs nanofibrils in healthcare, specifically as a cartridge filter in masks infused with Eucalyptus sp. This study sought to identify the optimal method for producing nanofibers with a minimal pore size by varying the concentrations of PVA (4%, 8%, 12%, and 16%) and nanocellulose (2.5%, 5%, and 7.5%). This research employs a combination of methods to produce nanocellulose of suitable size, an innovative process. The pretreatment process utilizes a blend of chemical and physical methods. Nanocellulose is synthesized using varying concentrations of sulfuric acid (25%, 50%, and 75%) during the acid hydrolysis process. The optimal nanocellulose size was attained at a sulfuric acid concentration of 50% (40oC, 10 minutes), as evidenced by a mean diameter of 484.3 nm. The amalgamation of physical and chemical methods has demonstrated efficacy in generating a beneficial pore size distribution in nanocellulose. Nanofibers are synthesized utilizing 12% PVA, 0.5% alginate, 2.5% nanocellulose, and 1% Eucalyptus sp. over 30 hours (3 mL), resulting in an average diameter of 200 nm for the created nanofibers. Concurrently, the nanofiber produced in the absence of Eucalyptus sp. exhibited a diameter of 240 nanometers.
Evaluation of Natural Zeolite and Bentonite as Catalysts in Cyclohexanone Oxidation with Hydrogen Peroxide Hidayatullah, Muhammad; Wibiyan, Sahrul; Mohadi, Risfidian; Lesbani, Aldes
Indonesian Journal of Material Research Vol. 3 No. 3 (2025): Future Issue: November
Publisher : Magister Program of Material Science Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijmr.20253369

Abstract

The catalytic oxidation of cyclohexanone using environmentally benign oxidants remains a key challenge in sustainable organic synthesis. In this study, natural zeolite (clinoptilolite and mordenite) and bentonite were evaluated as heterogeneous catalysts for the oxidation of cyclohexanone with hydrogen peroxide under reflux at 90 °C. Structural characterization by X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) confirmed the aluminosilicate frameworks, where clinoptilolite exhibited the highest crystallinity, followed by bentonite and mordenite. The oxidation products were analyzed using FTIR, melting point measurements, and gas chromatography–mass spectrometry (GC–MS). Despite the catalytic activity of all materials, FTIR and melting point analyses revealed that the expected adipic acid was not formed under the applied conditions. GC–MS results indicated the formation of partially oxidized oxygenated intermediates such as alcohols, ethers, and carbonyl derivatives, whose distribution strongly depended on the catalyst’s pore structure and surface properties. Clinoptilolite promoted confined partial oxidation due to its microporous structure, whereas bentonite facilitated non-selective oxidation owing to its open layered framework. These findings emphasize that the interplay between molecular confinement and oxygen accessibility governs the selectivity of cyclohexanone oxidation and provides insights for the rational design of improved zeolite- and clay-based catalytic systems for green oxidation reactions.
Synthesis of Adipic Acid via Eco-Friendly Oxidation of Cyclohexanone–Cyclohexanol Mixture over B₂O₃–SiO₂ Catalyst Sitanggang, Jonra P.; Wijaya, Alfan; Mohadi, Risfidian; Lesbani, Aldes
Indonesian Journal of Material Research Vol. 3 No. 3 (2025): Future Issue: November
Publisher : Magister Program of Material Science Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijmr.20253370

Abstract

The synthesis of adipic acid through the oxidation of a cyclohexanone–cyclohexanol mixture was investigated using 30% hydrogen peroxide (H₂O₂) as the oxidizing agent and a B₂O₃–SiO₂ catalyst synthesized via heat treatment at various temperatures. This study aimed to evaluate the catalytic performance of B₂O₃–SiO₂ in facilitating the oxidation reaction and to determine the optimum reaction conditions for achieving the maximum yield of adipic acid. The effects of reaction time and temperature on the oxidation process were systematically studied. The reactions were conducted for 5, 6, 7, and 8 hours at temperatures of 60°C, 70°C, 80°C, and 90°C. The reaction products were analyzed using Gas Chromatography (GC) and Fourier Transform Infrared Spectroscopy (FT-IR). The results showed that the B₂O₃–SiO₂ catalyst exhibited the highest catalytic activity at 90°C, producing adipic acid with a maximum yield of 2.36% after 7 hours of reaction. Based on FT-IR characterization, it was observed that the B₂O₃–SiO₂ catalyst became unstable after the reaction, as indicated by the reduction of Brønsted acid sites. This decrease in acidity led to a less effective catalytic performance, resulting in a suboptimal oxidation process and a relatively low yield of adipic acid.
Recovery of Burned Peatland: Revegetation Pattern Planning in Palm Oil Concession, South Sumatra Supriyadi, Supriyadi; Priatna, Satria Jaya; Prayitno, Muhammad Bambang; Harun, Muhammad Umar; Nur Khakim, Mokhamad Yusup; Mohadi, Risfidian
Sriwijaya Journal of Environment Vol 8, No 3 (2023): ENVIRONMENT AND COMMUNITY
Publisher : Program Pascasarjana Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22135/sje.2023.8.3.165-171

Abstract

Peatland ecosystems can recover from fire disasters through ecological succession, revegetation or both. In the context of oil palm plantations, revegetation planning for peatlands aims to restore the hydrological and carbon storage functions of peatlands, as well as to continuously increase the diversity of local vegetation by minimizing engineering activities on the land. This study explores the factors that influence revegetation of peatlands, identifies the distribution of water table levels as the main determinant. The water table levels, which vary from approximately 10 cm to 110 cm, correlate with topographic conditions and significantly impact vegetation survivability. The dominant plant species in the study area is Purun (Eleociharis dulcis), occupying approximately 44.5% of the total area. Other adaptable vegetation types, such as Gelam (Melaleiuca spp.) and Perepat (Combretocarpus rotundiatus), are considered suitable for propagation and planting as part of the peatland revegetation program. The study recommends prioritizing revegetation in areas with low vegetation diversity. Planting in areas with deep groundwater levels (60-80 cm) is recommended during the dry or humid months (June to September), while planting in areas with shallow groundwater levels (0-40 cm) is better conducted in the rainy season (October to December).
Treatment of Methylene Blue Using Ni-Al/Magnetite Biochar Layered Double Hydroxides Composite by Adsorption Zahara, Zaqiya Artha; Royani, Idha; Palapa, Neza Rahayu; Mohadi, Risfidian; Lesbani, Aldes
Bulletin of Chemical Reaction Engineering & Catalysis 2023: BCREC Volume 18 Issue 4 Year 2023 (December 2023)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20049

Abstract

Methylene blue dye is hard to degrade and requires treatment using Ni-Al Layered double hydroxides (LDHs) modified with magnetite biochar (MBC) to form Ni-Al/magnetite biochar composite in overcoming environmental pollution. Material attainment was identified by characterization using X-Ray Diffraction (XRD), Fourier Transform – Infra Red (FT-IR), Branuer Emmet Teller (BET), Scanning Electron Microscopy – Energy Dispersive X-Ray (SEM-EDX) and Vibration Sample Magnetometer (VSM). XRD characterization displays angle 2θ at 11°, 60° is a typical angle of LDH, and angles 22° and 35° of magnetite biochar. FT-IR characterization analysis at wavelength 1381 cm-1 for NO3- group and M-O group at wave number 700 cm-1. C-H group on biochar at 1404 cm-1 and wave number 586 cm-1 for Fe-O group. BET characterization analysis of Ni-Al/MBC has a large surface area and pore volume of 127.310 m²/g and 0.1950 cm³/g. SEM characterization analysis of Ni-Al/MBC has large, coarse pores and non-uniform shape, EDX data shows that there are forming elements such as Ni, Al from LDH and, Fe, C elements from magnetite biochar. pH, kinetics, isotherms, and thermodynamics become influential in adsorption processes. The adsorption capacity of the composite reaches 68.493 mg/g by following the Langmuir equation and adsorption kinetics refers to the Pseudo Second Order (PSO) equation. Adsorption continuity is spontaneous and endothermic. Ni-Al/MBC has stability in the process of adsorbent regeneration up to five adsorption cycles and, therefore can be used as a potential adsorbent in the treatment of methylene blue dye in aqueous environmental pollution. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Recycle Performance of Heterogeneous Catalyst Metal Oxides-Based Layered Double Hydroxide for Oxidative Desulfurization Process of 4-methyldibenzothiophene Ahmad, Nur; Rohmatullaili, Rohmatullaili; Hanifah, Yulizah; Wibiyan, Sahrul; Amri, Amri; Wijaya, Alfan; Mardiyanto, Mardiyanto; Mohadi, Risfidian; Royani, Idha; Lesbani, Aldes
Bulletin of Chemical Reaction Engineering & Catalysis 2023: BCREC Volume 18 Issue 4 Year 2023 (December 2023)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20034

Abstract

The desulfurization of oil must be resolved as soon as possible due to a variety of issues, including environmental contamination and protection regulations. It was believed that oxidative desulfurization (ODS) was the most promising method. In this research, metal oxide-based layered double hydroxides (TiO2@Ni-Al and ZnO@Ni-Al) were effectively synthesized for the ODS of 4-methyldibenzothiophene (4-MDBT). TiO2@Ni-Al and ZnO@Ni-Al exhibited superior catalytic performance and high recycling capacity, achieving a 99% removal rate after five reactions in 30 min. The heterogeneous catalyst TiO2@Ni-Al/ZnO@Ni-Al is easy to separate and recover from a reaction system. Increased temperature facilitates the transformation of 4-MDBT into 4-MDBTO2. The influence of H2O2's rapid decomposition rate, which can inhibit oxidation reactions, reduces the catalytic activity as the temperature increases. 4-MDBT Sulphur removal on TiO2@Ni-Al and ZnO@Ni-Al is 99.48 and 99.51%, respectively. TiO2@Ni-Al and ZnO@Ni-Al have great potential for use in the industry based on these results. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Co-Authors Agustiarini, Vitry Aldes Lesbani Alfarizi, Muhammad Afif Amiruddin Supu Amri Amri Amri Andreas, Roy Apriani, Elsa F. Arsyad, Fitri Suryani Badri, Arini Fousty Broekaert, José A.C. Dedi Setiabudidaya Elfita Elfita . Eliza . Eliza Eliza Erviana, Desti Fahma Riyanti Fitri, Erni Salasia Hakim, Yusuf Mathiinul Hanifah, Yulizah Harun, Muhammad Umar Hesti A. Harahap, Hesti Hidayatullah, Muhammad Idha Royani Jefri Jefri Juleanti, Novie Karvenia, Icha Aulia Kiki Anggraini, Kiki Komala Syari Kurniawan, Gilang Liasari, Beta Riana Lingga, Fitra Wahyuni Mardianto Mardiyanto Mardiyanto Mardiyanto Mardiyanto, Melwita, Elda Mustafa Kamal Najma Annuria Fithri, Najma Annuria Normah Normah Normah Normah, Normah Nova Yuliasari Nur Ahmad Nur Ahmad, Nur Nur khakim, Mokhamad Yusup Nurlisa Hidayati Nur’aini, Siti Prayitno, Muhammad Bambang Rakhmawati Farma Ramadhan, Jeri Rohmatullaili Rohmatullaili, Rohmatullaili Sabat Okta Ceria Sitompul, Sabat Okta Ceria Sari, Wida Fatma Satria Jaya Priatna, Satria Jaya Savira, Dila Sherly Agustina, Sherly Siregar, Patimah Mega Syah Bahar Nur Sitanggang, Jonra P. Siti Sailah, Siti Soerya, Balada Sri Haryati Suheryanto SUMIATI, Supriyadi Supriyadi Susila Arita Tarmizi Taher Wardhana, Singgih Tri Wibiyan, Sahrul Wijaya, Alfan Yosi Saria Yosine Susie Yuliana, Ayu Zahara, Zaqiya Artha Zulkarnain Zultriana