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All Journal Jurnal Kimia (Journal of Chemistry) The Journal of Pure and Applied Chemistry Research IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Science and Technology Indonesia IJEMS (Indonesian Journal of Environmental Management and Sustainability) Molekul: Jurnal Ilmiah Kimia Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Aceh International Journal of Science and Technology Karunia: Jurnal Hasil Pengabdian Masyarakat Indonesia Bumi: Jurnal Hasil Kegiatan Sosialisasi Pengabdian Kepada Masyarakat

Risfidian Mohadi

Department of Chemistry, Faculty of Mathematic and Natural Sciences, Universitas Sriwijaya, Indralaya (OI), Sumatera Selatan 30662, Indonesia

Author-ID : 361521

Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Materials Science & Nanotechnology Medicine & Pharmacology Physics Public Health Social Sciences

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Articles

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Performance of Graphite for Congo Red and Direct Orange Adsorption Rananda Vinsiah; Risfidian Mohadi; Aldes Lesbani
Indonesian Journal of Environmental Management and Sustainability Vol. 4 No. 4 (2020): December
Publisher : Research Centre of Inorganic Materials and Complexs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2020.4.4.125-132

To investigate its ability, graphite material was characterized by X-Ray diffraction (XRD), Fourier Transform Infrared Spectrophotometer (FTIR), Thermo Gravimetry Differential Thermal Analyse (TG-DTA), and Brunauer Emmet Teller (BET). Adsorption capability was evaluated by using Congo Red dye and Direct Orange dye solutions. The experiment was studied by using kinetic, isotherm, and thermodynamic parameters. The result of XRD characterization showed that graphite has four characteristic peaks which are 26,405?(002), 44,50?(101), 54,45?(004), and 77,32?(006). FT-IR characterization showed that the vibration at 3402 cm-1, 1635 cm-1, and 1381 cm-1. TG-DTA analysis showed that graphite has only one decomposition peak at 760 oC. BET analysis showed that the surface area of graphite was 11,558 m2/g. The optimum pH of CR and DO dyes were in pH 6 and pH 2 with contact time of 120 minutes. Kinetic adsorption model of CR and DO dye onto graphite follow pseudo-second-order model with a liner regression coefficient close to one. Isotherm parameter of CR and DO adsorption onto graphite follow Langmuir isotherm model with spontaneous endothermic process. The desorption process of graphite was used HCl to remove the dyes. Regeneration process of graphite showed that the capacity of adsorption decreased after it was reused 3 times.

Oxidation Of Cyclohexane To Cyclohexanol And Cyclohexanone Using H4[α-SiW12O40]/Zr As Catalyst Aldes Lesbani; Menik Setyowati; Risfidian Mohadi; Dedi Rohendi
Molekul Vol 11, No 1 (2016)
Publisher : Universitas Jenderal Soedirman

Synthesis and preparation of polyoxometalate H4[α-SiW12O40].nH2O with Zr as support at various weights of Zr 0.01g; 0.05 g; 0.25 g; 0.5 g; 0.75 g; 1 g and 1.25 g to form H4[α- SiW12O40]/Zr was conducted. The compounds from preparation were characterized using FTIR spectroscopy and crystallinity analysis using X-Ray diffraction. Thus H4[α- SiW12O40]/Zr was applied as catalyst for oxidation of cyclohexane to cyclohexanol and cyclohexanone. Oxidation process was studied through reaction time, hydrogen peroxide amount, temperature, and weight of catalyst. FTIR spectrum of H4[α-SiW12O40]/Zr was appeared at wavenumber 771.53-979.84 cm-1 and Zr at 486.06-1481.33 cm-1. Diffraction pattern of H4[α-SiW12O40]/Zr showed that high crystallinity was identified at 2θ 8o-10o and 28.3o. Based on FTIR spectrum and XRD powder pattern, the optimum preparation of H4[α-SiW12O40]/Zr was obtained using 0.5 g of Zr. The catalytic study of cyclohexane using H4[α-SiW12O40]/Zr at 0.5 g of Zr resulted conversion about 99.73%. Catalyst can convert cyclohexane with the highest conversion then used for further deep catalytic investigation. Optimization of oxidation process resulted optimum reaction time at 2 h, 3 mL of hydrogen peroxide amount, 80 oC of temperature, and 0.038 g of catalyst. The GCMS analysis indicated the oxidation of cyclohexane using H4[α-SiW12O40]/Zr at 0.5 g of Zr formed cyclohexanol and cyclohexanone with selectivity 18.77 and 23.57, respectively.

SINTESIS HIBRIDA ANORGANIK-ORGANIK V2O5-ASAM HUMAT DENGAN METODE SOL- GEL Risfidian Mohadi; Nurlisa Hidayati; Komala Syari
Jurnal Sains dan Terapan Kimia Vol 7, No 2 (2013)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Sintesis senyawa hibrida anorganik-organik V2O5-Asam humat menggunakan metode sol-gel. Perbandingan bahan yang digunakan adalah V2O5:asam humat:FeCl3:air (1:1:1:40:17) dilarutkan dan didinginkan sampai suhu 30oC, disaring dan didapatkan hibrida senyawa anorganik-organik tersebut. Senyawa ini kemudian dikarakterisasi dengan spektrofotometer FT-IR dan XRD. Hasil identifikasi dengan FT-IR diketahui bahwa gugus fungsi yang terdapat pada asam humat tidak muncul pada spektra hibrida sol-gel ini seperti C=C aromatik, C-H alifatik, C-H aromatik ini mengindikasikan bahwa asam humat telah berada dalam rongga V2O5. Hasil analisa dengan XRD, hibrida metode sol-gel ini memiliki indeks miller (111), (110), (100) dengan ukuran simetri (a) adalah 0,267nm. Kata kunci: sol-gel, microstructur, asam humat, V2O5, hibrida Abstract

Kinetic Adsorption of Direct Yellow Onto Zn/Al and Zn/Fe Layered Double Hydroxides Neza Rahayu Palapa; Bakri Rio Rahayu; Tarmizi Taher; Aldes Lesbani; Risfidian Mohadi
Science and Technology Indonesia Vol. 4 No. 4 (2019): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Zn/Al and Zn/Fe layered double hydroxides has successfully synthesized by co-precipitation methods with molar ration 3:1. The samples were characterized using X-Ray Diffraction, Fourier Transform Infrared Spectroscopy and Surface Area using BET method. In this study, Zn/Al and Zn/Fe layered double hydroxides were used to remove direct yellow dye in aqueous solution. The experiments were carried out time variations with the aim of observing the kinetic studies. The results showed that the adsorption of direct yellow onto Zn/Al and Zn/Fe layered double hydroxides based on co-efficient correlation kinetic models more fit using pseudo-second-order than pseudo-first-order.

Malachite Green Removal by Zn/Al-citrate LDHs in Aqueous Solution Nurlisa Hidayati; Risfidian Mohadi; Elfita Elfita; Aldes Lesbani
Science and Technology Indonesia Vol. 5 No. 2 (2020): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Calcium Oxide Decomposed From Chicken’s and Goat’s Bones as Catalyst For Converting Discarded Cooking Oil to be Biodiesel Aldes Lesbani; Yosine Susi; Marieska Verawaty; Risfidian Mohadi
Aceh International Journal of Science and Technology Vol 4, No 1 (2015): April 2015
Publisher : Graduate Program of Syiah Kuala University

Thermal decomposition of calcium oxide from chicken’s (Gallus gallus domesticus) and goat’s (Capra Hircus Aegragus) bones was prepared at temperature variations of 400, 500, 800, 900, 1000, and 1100 oC respectively. X-ray diffractometer (XRD), FT-IR and SEM were used for calcium oxide characterization. XRD diffraction pattern of the bone’s after thermal decomposition at 1100oC has similarity to the XRD standard diffraction pattern from Joint Committee on Powder Diffraction Standard (JCPDS). Diffractions of 2q values being used are 34.2o, 37.3o, 58.3o, 64.1o, and 67.3 o. Ca-O presence in the samples was detected by FT-IR characterization at wavenumber of 354,90 cm-1. SEM profile show reducing size of bones after decomposition in both chicken’s and goat’s bones. Furthermore, the prepared calcium oxide was applied for biodiesel synthesis from discarded cooking oil through transesterification reaction. By applying the catalysts decomposed from chicken’s and goat’s bones, the biodiesel product showed characteristics as follows: biodiesel applied the chicken’s bone catalyst has fatty acid number of 0.56 mg/KOH, iod number of 22.41 g I2/100 g KOH, density of 0.88 g/cm3 and viscosity of 5.91 mm2/s, while biodiesel applied the goat’s bone catalyst has 0.56 mg/KOH, iod number of 21.57 g I2/100 g KOH, density of 0.88 g/cm3 and viscosity of 6.34 mm2/s. Those biodiesel’s characteristic values meet the National Standard of Indonesia (SNI) for biodiesel.

Introduksi Lipstik Cair dari Umbi Buah Bit (Beta vulgaris L.) di Pasantren Putri Miksusanti Miksusanti; Azhar Kholiq; Aldes Lesbani; Endri Junaidi; Risfidian Mohadi; Neza Rahayu; Desnelli Desnelli; Syaflina Lamin
Karunia: Jurnal Hasil Pengabdian Masyarakat Indonesia Vol. 3 No. 1 (2024): Maret : Jurnal Hasil Pengabdian Masyarakat Indonesia
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/karunia.v3i1.2008

A community service scheme for implementing science and technology has been carried out from Srwiijaya University funding sources. Community service is carried out at the Ittifaqiah Islamic Boarding School for women in Indralaya, Ogan Ilir, South Sumatra. Participants who attended were 60 Islamic boarding school students in the science class, 10 science teachers and 2 Ittifaqiah administrators. Community service was carried out using lecture methods and demonstrations of making liquid lipstick in front of female students and teachers. The natural ingredients used in making lipstick in this service activity are beet root extract, virgin coconat oil (VCO), soy lecithin, gum Arabic, food flavors and food preservatives. There were 20 organoleptic tests carried out on Unsri female students on the liquid lipstick made in this service activity. Fifteen people said they really liked it, 3 people said they liked it quite a lot and 2 people said they liked the product a little. The survey on the results of service activities showed that 50 female students said they really understood how to make liquid lipstick, 8 students said they understood quite well how to make liquid lipstick with the red color of beetroot and 2 female students said they understood a little.

Pembelajaran Modifikasi Nutrasetikal Temu Mangga Menjadi Produk “Temapro” untuk Kesehatan Masyarakat Miksusanti Miksusanti; Risfidian Mohadi; Aldes Lesbani; Nirwan Syarif; Neza Rahayu Palapa; Azhar Kholiq; Syafrina Lamin
Bumi : Jurnal Hasil Kegiatan Sosialisasi Pengabdian kepada Masyarakat Vol. 3 No. 2 (2025): April : Bumi : Jurnal Hasil Kegiatan Sosialisasi Pengabdian kepada Masyarakat
Publisher : Asosiasi Riset Teknik Elektro dan Informatika Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/bumi.v3i2.760

This community service program aims to develop nutraceutical-based health products from temu mangga (Curcuma mangga Val.van Zip) and probiotics, called "TEMAPRO". Research and socialization were conducted in Pulau Semambu Village, South Sumatra, targeting village mothers who have limited knowledge about the benefits of herbs and probiotics. Temu mangga, which is traditionally consumed as a salad and herbal medicine, contains various active compounds that have the potential as antioxidants and anti-cancer. Combined with the probiotic Lactobacillus rhamnosus, this product is expected to support digestive health and increase body immunity. Implementation methods include education, training in making temu mangga extract, mixing with probiotics, and product packaging techniques. The results of the activities showed an increase in community understanding and skills in processing local materials into health products with economic value. It is hoped that "TEMAPRO" will not only improve the quality of public health, but also open up business opportunities in the village through local nutraceutical products.

Co-Authors Adi Saputra Adipati Napoleon Agus Dwi Saputra Ahmad Fatoni Aldes Lesbani Azhar Kholiq Bakri Rio Rahayu Dedi Rohendi Desnelli Desnelli Doni Setiawan Elfita Elfita Endri Junaidi Euis Marsitho Hermansyah Hermansyah Hilda Zulkifli Jeri Ramadhan Komala Syari Marieska Verawaty Melantina Melan Oktriyanti Menik Setyowati Miksusanti Miksusanti Minaria Minaria Mirza Firdyah Astari Muhammad Said Neza Rahayu Nirwan Syarif Noormaisyah Saleh Nurlisa Hidayati Nurlisa Hidayati Nyanyu Ummu Hani Osin Restinawaty Tambunan Puteri Kusuma Wardhani Rananda Vinsiah Sabat Okta Ceria Sitompul Santa Oktavia Ginting Sri Haryati Syaflina Lamin Syafrina Lamin, Syafrina Tarmizi Taher Theresia Debora Simbolon Tiara Armita Triayu Septiani Welinda Me Yosine Susi Zazili Hanafiah

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