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All Journal Bulletin of Chemical Reaction Engineering & Catalysis IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Science and Technology Indonesia Indonesian Journal of Chemistry Communications in Science and Technology Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Jurnal Kreativitas PKM Molekul: Jurnal Ilmiah Kimia JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) International Journal of Sustainable Transportation Technology Jurnal Altifani Penelitian dan Pengabdian kepada Masyarakat Bulletin of Chemical Reaction Engineering & Catalysis

Addy Rachmat

Department Of Chemistry, Faculty Of Mathematics And Natural Science, Sriwijaya University

Author-ID : 501480

Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation

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Preparation of NiFe2O4 Nanoparticles by Solution Combustion Method as Photocatalyst of Congo red Poedji Loekitowati Hariani; Muhammad Said; Addy Rachmat; Fahma Riyanti; Handayani Citra Pratiwi; Widya Twiny Rizki
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 3 Year 2021 (September 2021)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.3.10848.481-490

NiFe2O4 nanoparticles had been successfully synthesized by solution combustion method using urea fuel (organic precursor). The synthesized NiFe2O4 were characterized by X-ray diffraction (XRD), Scanning electron microscopy-Electron Dispersive X-ray Spectroscopy (SEM-EDs), Transmission Electron Microscopy (TEM), Fourier Transform Infra-Red (FTIR), Vibrating Sample Magnetometer (VSM), UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS), and Point of Zero Charge (pHpzc). NiFe2O4 nanoparticles irradiated with visible light were employed to degrade Congo red dye with the following variable: solution pH (3–8), H2O2 concentration (0.5–3 mM), and Congo red concentration (100–600 mg/L). XRD analysis results showed that the NiFe2O4 nanoparticles had a cubic spinel structure. The particle sizes are in the range of 10–40 nm. The magnetic properties of NiFe2O4 nanoparticles determined using VSM showed a magnetization saturation value of 47.32 emu/g. UV-Vis DRS analysis indicated that NiFe2O4 nanoparticles had an optical band gap of 1.97 eV. The success of synthesis was also proven by the EDS analysis results, which showed that the synthesized NiFe2O4 nanoparticles composed of Ni, Fe, and O elements. The removal efficiency of Congo red dye was 96.80% at the following optimum conditions: solution pH of 5.0, H2O2 concentration of 2 mM, Congo red dye concentration of 100 mg/L, and contact time of 60 min. The study of the photodegradation kinetics follows a pseudo-first order reaction with a rate constant value of 0.0853 min−1. Copyright © 2021 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).

Removal of Pb(II) using Hydroxyapatite from Golden Snail Shell (Pomacea canaliculata L.) Modified with Silica Poedji Loekitowati Hariani; Fahma Riyanti; Fatma Fatma; Addy Rachmat; Aldi Herbanu
Molekul Vol 15, No 2 (2020)
Publisher : Universitas Jenderal Soedirman

The composites of hydroxyapatite and SiO2 were successfully synthesized. The hydroxyapatite was prepared from golden snail shells (Pomacea canaliculata L). The hydroxyapatite and hydroxyapatite-SiO2 composites were characterized using XRD, FTIR, SEM-EDS. Furthermore, hydroxyapatite and hydroxyapatite-SiO2 composites were used to remove Pb(II) from aqueous solution. Various adsorption parameters such as pH of the solution, contact time, and initial Pb(II) concentration were used to study the adsorption process. The optimum pH of the solution for removal of Pb(II) by hydroxyapatite and hydroxyapatite-SiO2 composite at pH 6 and contact time at 60 minutes. Both adsorbents follow the Langmuir isotherm. The maximum adsorption capacity of the hydroxyapatite-SiO2 composite is greater compare to hydroxyapatite, respectively 135.14 and 123.46 mg/g. The pseudo-second order kinetic model had a correlation coefficient (R2) greater than the pseudo-first order so pseudo-second order kinetic is better to describe adsorption kinetics

Comparison of Cr/C and Cr2O3/Z Catalysts on Hydrocracking of Bio Oil from Pyrolysis of Palm Empty Fruit Bunches Zainal Fanani; Hasanuddin hasanuddin; Addy Rachmat; Muhammad Said
Molekul Vol 16, No 3 (2021)
Publisher : Universitas Jenderal Soedirman

Bio-oil derived from palm empty fruit bunch is not suitable for fuel purpose due to high acidity and low heating. Cr2O3/Zeolite and Cr/C catalysts was developed to upgrade bio-oil through hydrocracking. The catalyst prepared via impregnation method followed by oxidation-reduction. Ammonia and pyridine adsorption used to evaluate acidity as well as crystallinity assessment by using XRD. Hydrocracking reaction conducted in hydrogen gas flow rates 0.5-3.0 L/min, the surface area of Cr/C catalyst found out 1,497.07-1,652.58 m2/g, whilst the temperatures 450 to 700 ℃ and the catalyst weights between 0.5 to 2.5 g. Acidity calculated from ammonia and pyridine adsorption shows Cr2O3/Zeolite has higher value compare to pristine Zeolite. XRD pattern shows Cr2O3/Zeolite has high crystallinity as indicated by sharp and pointed diffraction peaks. The optimum condition of hydrocracking confirmed by lower density of liquid product. The variables obtained by a separate experiments shows that H2 gas flow rate best at 2.5 L/min, temperature of hydrocracking 500 ℃ for Cr2O3/Zeolite and 600oC for Cr/C whereas weight of Cr2O3/Zeolite catalyst is 1.5 g. The Cr/C catalyst that gave low density product possess 1,554.48 m2/g surface area. GCMS data shows increase on the number of straight chain compounds within the hydrocracking product.

PENGGUNAAN KATALIS PALADIUM DALAM REAKSI ARILASI n-OKTILSILAN DENGAN 2-IODIDA-5-METIL TIOFEN Aldes Lesbani; Addy Rachmat; Risfidian Mohadi; Eliza Eliza
Molekul Vol 9, No 1 (2014)
Publisher : Universitas Jenderal Soedirman

Telah dilakukan proses arilasi n-oktilsilan dengan 2-iodida-5-metil tiofen mengunakan katalis palladium dengan teknik reaksi kopling untuk mendapatkan variasi senyawa hasil arilasi. Produk hasil arilasi yang terbentuk dimurnikan dengan metode kromatografi kolom silika dengan eluen etil asetat dan dikarakterisasi menggunakan spektroskopi massa, spektroskopi 1H NMR, 13C NMR, dan DEPT-135. Hasil penelitian menunjukkan bahwa senyawa yang terbentuk dari hasil arilasi yakni tris(5-metil-2-tiofen)oktilsilan yang berupa cairan tak berwarna dengan nilaim/z sebesar 432. Hasil pengukuran menggunakan spektroskopi 1H NMR menghasilkan tujuh proton ekivalen. Pengukuran menggunakan spektroskopi 13C NMR menghasilkan tiga belas karbon ekivalen yang kemudian dikonfirmasi dengan DEPT-135. Hasil karakterisasi menggunakan spektroskopi massa dan spektroskopi NMR (H dan C) menunjukkan senyawa hasil sintesis adalah tris(5-metil-2-tiofen)oktilsilan.

Produksi Tablet Kosmetika Herbal Buah Tembesu Untuk Perawatan Kulit dan Wajah Addy Rachmat; Julinar Julinar; Desnelli Desnelli; Dasril Basir
JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) VOL. 4 NOMOR 2 SEPTEMBER 2020 JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat)
Publisher : Lembaga Publikasi Ilmiah dan Penerbitan (LPIP)

Buah Tembesu (Fragraea fragrans) memiliki metabolit sekunder asam ursolat, asam oleanolat, dan alkaloid gentianin. Senyawa metabolit sekunder ini telah diteliti dan dapat dimanfaatkan sebagai antiinflamasi, antikanker, antibakterial, antiaging, antifungal, antiviral, antialergik. Senyawa flavonoid juga teridentifikasi pada buah ini yang dapat digunakan sebagai antioksidan dan peredam radikal bebas penahan ageing; dan tanin trimer sebagai antikerut (antiwrinkle). Produk kosmetika herbal dari buah Tembesu telah diuji dan memberikan manfaat bagi peningkatan kesehatan kulit dan wajah. Warga di Desa Limbang Jaya II memiliki pemukiman yang kaya akan pohon Tembesu. Kegiatan pengabdian berupa penyuluhan dan pelatihan pembuatan kosmetika alam akan memberikan nilai lebih bagi hasil alam di desa tersebut. Produk kosmetika ini lebih disukai oleh remaja milenial saat ini karena tidak saja halal tetapi juga berkhasiat untuk perawatan tanpa ada efek samping karena hanya mengandung bahan alami.

Modification of Fishbone-Based Hydroxyapatite with MnFe2O4 for Efficient Adsorption of Cd(II) and Ni(II) from Aqueous Solution Poedji Loekitowati Hariani; Addy Rachmat; Muhammad Said; Salni Salni
Indonesian Journal of Chemistry Vol 21, No 6 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.66888

Due to their toxicity, Cd(II) and Ni(II) ions in the environment are severe. The hydroxyapatite composite was improved with magnetic MnFe2O4 to remove Cd(II) and Ni(II) ions from an aqueous solution. Hydroxyapatite was extracted from Snakehead (Channa striata) fish bones via alkaline-heat treatment. The hydroxyapatite/MnFe2O4 composite performance was analyzed through XRD, FTIR, SEM-EDS, BET analysis, and VSM, and the results reveal that the hydroxyapatite/MnFe2O4 composite shows good magnetic properties of 21.95 emu/g. The kinetics evaluation confirmed that the pseudo-second-order kinetics model was more suitable to describe the adsorption of Cd(II) and Ni(II) ions by hydroxyapatite/MnFe2O4 composite from the solution. The Langmuir isotherm model was suitable to describe the adsorption process of the Cd(II) and Ni(II) ions, where the adsorption capacities for Cd(II) and Ni(II) are 54.3 and 47.4 mg/g, respectively. Desorption of Cd(II) and Ni(II) ions from hydroxyapatite/MnFe2O4 composite using NaCl as the eluent was more effective than EDTA. The findings of this study indicate that hydroxyapatite/MnFe2O4 can reduce Cd(II) and Ni(II) ions in wastewater so that it can recover natural resources.

Pembuatan dan Penyuluhan Virgin Coconut Oil di Desa Tanjung Seteko Indralaya dan Manfaatnya Untuk Kesehatan Nurlisa Hidayati; Hermansyah Hermansyah; Ferlinahayati Ferlinahayati; Addy Rachmat; Ahmad Fatoni
Jurnal Kreativitas Pengabdian Kepada Masyarakat (PKM) Vol 5, No 7 (2022): Volume 5 No 7 Juli 2022
Publisher : Universitas Malahayati Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jkpm.v5i7.6192

ABSTRAK Telah dilaksanakan kegiatan pengabdian kepada masyarakat Desa Tanjung Seteko Indralaya. Tujuan kegiatan ini adalah untuk memberikan informasi kepada masyarakat tentang: pengolahan buah kelapa menjadi virgin coconut oil (VCO) dan demonstrasi pembuatan dan pemanfaatan VCO. Kegiatan Pengabdian kepada Masyarakat ini diikuti 20 orang ibu rumah tangga dan remaja putri yang berasal dari desa Tanjung Seteko. Kegiatan yang dilaksanakan adalah memperkenalkan teknologi pembuatan VCO. Selain itu dilakukan juga diskusi dan demonstrasi penggunaan VCO sebagai ramuan yang berguna bagi kesehatan. Penyuluhan yang dilakukan mendapat tanggapan yang positif dari masyarakat. Kegiatan diskusi dan tanya jawab juga mendapat perhatian yang tinggi dari masyarakat. Masyarakat merasa senang karena mendapatkan pengetahuan dan keterampilan tentang teknologi pembuatan VCO. Dengan diberikannya penyuluhan masyarakat juga menjadi faham cara membuat ramuan berbahan dasar VCO. Masyarakat juga berharap kegiatan pengabdian dapat berlangsung secara berkelanjutan, sehingga wawasan mereka akan terus bertambah baik. Kata Kunci: Pembuatan, Penyuluhan, VCO ABSTRACT Community service activities in Tanjung Seteko village Indralaya have been carried out. The purpose of this activity is to provide information to the public about: processing coconuts into virgin coconut oil (VCO) and demonstrations of making and using VCO. This community service activity was attended by 20 housewives and young women from Tanjung Seteko village. The activity carried out to introduce the technology of making Virgin Coconut Oil. In addition, discussions and demonstrations on the use of VCO as an ingredient that is useful for health were also held. The counseling carried out received a positive response from the community. Discussion and question and answer activities also received high attention from the community. People are happy because they get knowledge and skills about VCO manufacturing technology. By providing public education, they also understand how to make VCO-based ingredients. The community also hopes that service activities can take place in a sustainable manner, so that their knowledge will continue to improve. Keywords: Making, Counseling, VCO

Synthesis of NiFe2O4/SiO2/NiO Magnetic and Application for the Photocatalytic Degradation of Methyl Orange Dye under UV Irradiation Poedji Loekitowati Hariani; Muhammad Said; Addy Rachmat; Salni Salni; Nabila Aprianti; Anisa Fitri Amatullah
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 4 Year 2022 (December 2022)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.4.15788.699-711

NiFe2O4/SiO2/NiO magnetic was successfully synthesized using NiFe2O4, SiO2, and NiO as the core, interlayer, and shell, respectively. NiFe2O4/SiO2/NiO under UV light irradiation was used for photocatalytic degradation of methyl orange dye with different pH, catalyst dose, and initial dye concentration. This composite was characterized by X-ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR), Scanning Electron Microscopy-Electron Dispersive X-ray Spectroscopy (SEM-EDs), Vibrating Sample Magnetometer (VSM), UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS), and Point of Zero Charge (pHpzc). The results showed that the composite is a superparamagnetic material with a saturation magnetization value of 44.13 emu/g. It also has a band gap of 2.67 eV with a pHpzc of 6.33. The optimum conditions for photocatalytic degradation were at pH of 4; 0.50 g/L catalyst dose, and 10 mg/L initial concentration. NiFe2O4/SiO2/NiO degradation efficiency to methyl orange dye was 95.76%. The photocatalytic degradation in different concentrations follows the pseudo-first-order, where the greater the concentration, the smaller the constant rate (k). After five cycles of repeated usage, NiFe2O4/SiO2/NiO has good catalytic performance as well as efficient and favourable of a recyclable photocatalyst. Copyright © 2022 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).

ISOTERM ADSORPSI-DESORPSI DAN POROSITAS KATALIS Ag-TiO 2 /ZEOLIT Hasanudin Hasanudin; Addy Rachmat
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 7 No. 2 (2010): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v7i2.10

ABSTRAKPenelitian tentang Isoterm Adsorpsi-Desorpsi dan Porositas Katalis Ag â€“TiO 2 /Zeolit telah dilakukan. Katalis ini dibuat dengan penambahan oksida logamÂ TiO 2 dan impregnasi logam Ag dengan variasi jumlah logam Ag yaitu 1%, 10%, 20%.Â Karakterisasi katalis meliputi pola topografi dengan Scanning Electron MicroscopeÂ (SEM) dan analisis isoterm adsorpsi dengan menggunakan Gas Sorption Analyzer.Tipe isoterm adsorpsi yang terbentuk berdasarkan klasifikasi BDDT adalah tipe II danÂ isoterm desorpsi yang terbentuk berdasarkan klasifikasi BET adalah tipe C. HasilÂ penelitian menunjukkan bahwa adanya pori yang membesar akibat penambahanÂ logam TiO 2 sehingga meningkatkan luas permukaan spesifik, total volume pori, danÂ jari-jari pori rata-rata katalis. Pengaruh impregnasi logam Ag pada katalis mampuÂ menurunkan luas permukaan katalis senilai 129,94% dan menurunkan total volumeÂ pori senilai 34,81% namun dapat meningkatkan jari-jari pori rata-rata senilai 70,56%.Kata kunci: Zeolit, porositas, katalis

CuAl LDH/Rice Husk Biochar Composite for Enhanced Adsorptive Removal of Cationic Dye from Aqueous Solution Neza Rahayu Palapa; Tarmizi Taher; Bakri Rio Rahayu; Risfidian Mohadi; Addy Rachmat; Aldes Lesbani
Bulletin of Chemical Reaction Engineering & Catalysis 2020: BCREC Volume 15 Issue 2 Year 2020 (August 2020)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.15.2.7828.525-537

The preparation of CuAl LDH and biochar (BC) composite derived from rice husk and its application as a low-cost adsorbent for enhanced adsorptive removal of malachite green has been studied. The composite was prepared by a one-step coprecipitation method and characterized by X-ray Diffraction (XRD), Fourier Transform Infra Red (FTIR), Brunauer-Emmett-Teller (BET), and Scanning Electron Microscopy - Energy Dispersive X-ray (SEM−EDX). The result indicated that CuAl LDH was successfully incorporated with the biochar that evidenced by the broadening of XRD peak at 2θ = 24° and the appearance of a new peak at 1095 cm−1 on the FTIR spectra. The BET surface area analysis revealed that CuAl/BC composite exhibited a larger surface area (200.9 m2/g) that the original CuAl LDH (46.2 m2/g). Surface morphological changes also confirmed by SEM image, which showed more aggregated particles. The result of the adsorption study indicated the composite material was efficient in removing malachite green with Langmuir maximum adsorption capacity of CuAl/BC reaching 470.96 mg/g, which is higher than the original CuAl LDH 59.523 mg/g. The thermodynamic analysis suggested that the adsorption of malachite green occurs spontaneously (ΔG < 0 at all tested temperature) and endothermic nature. Moreover, the CuAl/BC composite showed strong potential as a low-cost adsorbent for cationic dye removal since it showed not only a high adsorption capacity but also good reusability. Copyright © 2020 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 A.M. Ramadhan Adelia, Ory Adhiyanti, Nurmalina Ahmad Fatoni Aldes Lesbani Aldi Herbanu Amelia, Icha Anisa Fitri Amatullah Bakri Rio Rahayu Dasril Basir Dea Radestia Rahmah Dedi Rohendi Desnelli Desnelli Dwi Hawa Yulianti Dwi Hawa Yulianti Edy Herianto Majlan, Edy Herianto Elfita Elfita Eliza Eliza Eliza Eliza Fahma Riyanti Fanani, Muhammad Zainal Fatma Fatma Fatma Fatmawati Fatmawati Ferlinahayati Ferlinahayati Handayani Citra Pratiwi Hardi Aji Badarwi Hasanuddin Hasanuddin Hasanudin hasanudin Hasanudin Hasanudin Hasanudin Hasanudin Hasanudin, Hasanudin Hermansyah Hermansyah Hermansyah Julinar Julinar Julinar Julinar Muhammad Said Muhammad Said Muhammad Said Muhammad Said Muhammad Said Nabila Aprianti Nirwan Syarif Nirwan Syarif Nirwan Syarif Nirwan Syarif, Nirwan Normah Normah, Normah Nurlisa Hidayati Nurmalina Adhiyanti Poedji Loekitowati Hariani Poedji Loekitowati Hariani Rahmah, Dea Risfidian Mohadi Risfidian Mohadi Rizki, Widya Twiny Salni Salni Salni Salni Sya'baniah, Nyimas Syabaniah, Nyimas Febrika Syarif, Nirwan Sya’baniah, Nyimas Febrika Tarmizi Taher Widia Purwaningrum Yulianti, Dwi Yulianti, Dwi Hawa

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