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All Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Dasar Jurnal Natur Indonesia Sainstek TELKOMNIKA (Telecommunication Computing Electronics and Control) CHEMICA Jurnal Teknik Kimia Jurnal Matematika & Sains Eksergi: Chemical Engineering Journal Jurnal Riset Kimia ROTOR: JURNAL ILMIAH TEKNIK MESIN Jurnal Kimia dan Kemasan PROSIDING SEMINAR KIMIA Jurnal Penelitian Pertanian Terapan Chimica et Natura Acta INDONESIAN JOURNAL OF APPLIED PHYSICS ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry JURNAL PHOTON Eksakta : Berkala Ilmiah Bidang MIPA Indonesian Journal of Electrical Engineering and Computer Science Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Hydrogen: Jurnal Kependidikan Kimia Jurnal Kimia dan Kemasan AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Makara Journal of Science SAINTI: Majalah Ilmiah Teknologi Industri Jurnal Kimia Unand
Syukri Arief
Andalas University
Agriculture, Biological Sciences & Forestry Astronomy 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 Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Social Sciences Other

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Separation of Kaolinite from Clay Minerals and Its Catalytic Activity in Transesterification Reactions Rahayu, Rahayu; Nengsih, Zarnida Widia; Arief, Syukri; Rilda, Yetria; Alif, Matlal Fajri; Syukri, Syukri
Hydrogen: Jurnal Kependidikan Kimia Vol. 12 No. 1 (2024): February 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i1.10600

Abstract

Kaolinite is a type of clay mineral that has the potential to be used as a heterogeneous catalyst in transesterification reactions. However, natural clay still contains a mixture of minerals that occur together. Therefore, as an effort to search for cheaper catalysts to reduce the price of biodiesel production, this study carried out the separation of kaolinite from natural clay and tested its performance as a catalyst in biodiesel production from Waste Cooking Oil (WCO). Separation of the kaolinite fraction was carried out with the help of NH4Cl as a dispersing agent. The main mineral composition of clay as quartz, kaolinite, montmorillonite and hematite. After the separation process, the crystallinity of the minerals experienced an increase marked by an increase in the intensity of several kaolinite peaks, namely in the 2θ 12.24° area from 103 to 108 and at 25.00° from 95 to 125. Thermal modification caused the loss of several kaolinite peaks in the area. 2θ 12.17°; 24.94° and 62.39°. The Si/Al ratio decreased after the fractionation and calcination processes. Average particle size of h-clay decreased from 27.61 µm to 21.09 µm in K-clay. The K-clay catalyst produced the highest conversion of palmitic acid at 42%, while c-K-clay produced the highest conversion of oleic acid and stearate at 30%. In addition, the density and water content of biodiesel catalyzed by K-clay and c-k-clay meet SNI standards. This finding has the potential to be further developed as a cost-effective catalyst based on natural resources in biodiesel production.
KAJIAN AKTIVITAS ANTI OKSIDAN PADA BAHAN ALAM DENGAN MENGGUNANAKAN 1,1-DIFENIL-2-PIKRILHIDRAZIL (DPPH) Syukri Arief; Risma Sari; Novesar Jamarun; Sumaryati Syukur
SAINTI: Majalah Ilmiah Teknologi Industri Vol. 16 No. 2 (2019)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/

Abstract

Penelitian ini bertujuan untuk mengetahui potensi anti oksidan yang terdapat pada bahan alam.Uji aktivitas antiantioksidan ini dilakukan pada beberapa bahan alam atau tumbuhan umum yang telah dikenal dan digunakan secara turun temurun oleh masyarakat Indonesia. Pengujian aktivitas antioksidan dilakukan dengan metoda DPPH menggunakan parameter IC50 dan sampel bahan alam yang digunakan adalah virgin coconut oil (VCO) dari tanaman kelapa, Daun Tanjung dan ekstrak daun salam. Uji aktivitas antioksidan menunjukkan bahwa sampel bahan alam yang digunakan memiliki aktivitas antioksidan yang kuat, didapatkan nilai IC50 berada diantara 50-100 ppm
Sintesis Senyawa Aurivillius Ca1-xBi3,5+xLa0,5Ti4-xMnxO15: Struktur dan Sifat Dielektrik Zulhadjri Zulhadjri; Rini Ramadhani; Aulia Arivin Billah; Syukri Arief; Emriadi Emriadi
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 1 (2018): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.1.14476.143-151

Abstract

Sintesis senyawa feroelektrik yang berbasis fasa Aurivillius berlapis empat (n = 4) yang didadah kation La3+ dan Mn3+, Ca1-xBi3,5+xLa0,5Ti4-xMnxO15 dengan x = 0, 0,2, 0,4, 0,6, 0,8, dan1 telah dilakukan dengan teknik lelehan garam. Karakterisasi produk dengan difraksi sinar-X (XRD) menunjukkan bahwa fasa tunggal Aurivillius ditunjukkan oleh sampel dengan x = 0, 0,2, 0,4, dan 0,6. Refinement struktur dengan teknik Le Bail diketahui bahwa senyawa Aurivillius yang terbentuk sesuai dengan simetri ortorombik dan grup ruang A21am. Analisis dengan Scanning Electron Microscopy (SEM) untuk semua sampel memperlihatkan morfologi sampel berupa lempengan yang merupakan ciri khas senyawa Aurivillius. Nilai konstanta dielektrik sampel dan konduktivitasnya mengalami kenaikan dengan meningkatnya x. Konduktivitas paling tinggi dimiliki oleh sampel x = 0,2 yang diperkirakan akibat adanya interaksi pertukaran ganda (double exchange) antara Mn3+ dan Mn4+.Synthesis of Aurivillius Compounds Ca1-xBi3,5 + xLa0,5Ti4-xMnxO15: Structure and Dielectric Properties. Synthesis of ferroelectric compounds based on a four-phase Aurivillius phase (n = 4) which is doped with La3+ and Mn3+ cations, Ca1-xBi3,5+xLa0,5Ti4-xMnxO15 with x = 0, 0.2, 0.4, 0.6, 0 , 8, and 1 were carried out by molten salts technique. Characterization of products using X-ray diffraction (XRD) revealed that the single phase Aurivillius was shown by the samples with x = 0, 0,2, 0,4, and 0,6. The results of refinement show that the Aurivillius phase formed has orthorhombic symmetry with A21am space group. Morphology analysis by scanning electron microscopy (SEM) for all samples shows the plate-like as the characteristic of Aurivillius compounds. The value of dielectric constant and conductivity of the samples increases as increase of x. The conductivity of x = 0.2 is the highest predicted due to the interaction of double exchange between Mn3+ and Mn4+.
Inventarisasi Dan Formulasi Tanaman Pestisida Nabati Pada Petani Di Sumatera Barat Yuliartati Yuliartati; Sri Zulyanti Mardhiah; Arian Dodi; Syukri Arief; May Efdi
Jurnal Penelitian Pertanian Terapan Vol 24 No 4 (2024)
Publisher : Politeknik Negeri Lampung.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25181/jppt.v24i4.3444

Abstract

This study aims to inventory the plants used by farmers in West Sumatra to make vegetable pesticide ingredients and determine their effectiveness and to formulate botanical pesticides based on their effectiveness in killing insects. Data collection was carried out by direct interviews with farmers. Testing the active substance content of vegetable pesticides is carried out by means of a phytochemical test in the laboratory. The effectiveness of the plant extracts from the inventory was tested in the laboratory. Testing the effectiveness of botanical pesticide formulations is carried out in the field. Formulation effectiveness data were observed qualitatively by farmer groups from the number of leaf vegetables eaten by caterpillars or insects for approximately 2 weeks. There were 44 (forty four) species of plants used by farmers as ingredients for making vegetable pesticides, and 20 (twenty) species of phytochemical tests were carried out, followed by 17 (seventeen) species of effectiveness tests. Formulas for vegetable pesticides are made based on the results of laboratory extract effectiveness tests. The results of the study showed that plants that were effective as ingredients for vegetable pesticides were surian, neem, karakok, citronella which were made with the following formulations: Formula 1 (Surian and Karakok), Formula 2 (Surian, Mindi, Karakok), Formula 3 (Mindi and Karakok) , and Formula 4 (Surian, Mindi, Karakok, Lemongrass Wangi). The results of the effectiveness test of the botanical pesticide formulas in the field showed that the F2 and 4 formulas were more effective than the F1 and F3.
Sintesis dan Karakterisasi Struktur dan Sifat Magnet Nanokomposit Fe3O4@PEG:ZnO Astuti Astuti; ihda khaira; syukri Arief; Sri Rahayu Alfitri Usna
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 2 (2022): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.58514

Abstract

Fe3O4@PEG:ZnO nanocomposites were synthesized by the coprecipitation method with various of the samples were Fe3O4, Fe3O4@ZnO (1:1), Fe3O4@PEG: ZnO (1:2), and Fe3O4@ PEG: ZnO (1:3). The samples were synthesized with variation in the concentration of ZnO to Fe3O4. The concentration ratio of (Fe3O4:ZnO) were (1:1), (1:2), and (1:3). In addition, polyethylene glycol (PEG) is also used to prevent the agglomeration of Fe3O4. Sample characterization was carried out using X-Ray Diffraction (XRD), Transmission Electron Microscope (TEM), Fourier Transform Infrared (FTIR), Particle Size Analyzer (PSA), and vibrating Sample Magnetometer (VSM). The XRD patterns show that the sample is composed of Fe3O4phase and ZnO phase with crystal structure cubic and wurtzite respectively. The TEM image shows the formation of a core-shell structure where PEG: ZnO is the shell and Fe3O4 is the core. From the FTIR results, there are C-O and C-C bonds which indicate the formation of PEG, Fe-O bonds indicate the formation of Fe3O4 and Zn-O bonds indicate the formation of ZnO. Characterization with PSA obtained particle sizes of 33 nm, 23 nm, and 16 nm with particle size distributions of 25%, 50%, and 75% so that the average particle size is 24 nm. The VSM results show that Fe3O4@PEG: ZnO (1:2) nanocomposite has a high magnetic saturation of 66.58 emu/g, with superparamagnetic properties, which has the potential to be developed as a bioimaging material.
Co-Authors -, Emdeniz -, Rianda -, Yulfitrin . Darwison Abdi Dharma Abral, Hairul Ade saputra Ade Saputra Adlis Santoni Admi Admin Alief Admin Alif Admin Alif Admin Alif Admin Alif Admin Alif Agtata, Shazvelia Dwi Ahmad Hafizullah Ritonga Aju Deska Alif, Admin Alif, Admin Alif, Admin Amelia Amir Anggreini, Sri Anggresani, Lia Anwar Kasim Ariadi Hazmi Arian Dodi Aritonang, Barita Astuti Astuti Aulia . Aulia Arivin Billah Baharuddin Shaleh Boy isfa Boy Isfa BUSTANUL ARIFIN Denny Akbar Tanjung Denny Akbar Tanjung Desfitri, Erda Rahmilaila Deswati Deswati Devi Pebrina Eka Putra Waldi Ellyta Sari Emdeniz - Emriadi - Evi Adhelina Fatiha, Widya Yuliani Fitri, Ernarisa Hamdi, Hayatul Hary Sanjaya Hayatul Hamdi Herlin Oktavani Hermansyah Aziz Hermawan, Budi ihda khaira Kazuhiro Manseki Khoirul Amru Kusuma, Theresia Sita Lestari Ningsih Lia Anggresani Lisa Utami Lisa Utami Lusi Puspitasari M. H. Ahmad Mahardika, Melbi Mai Efdi Mai Efdi Maria Erna Maria Erna Maria Erna Kustyawati Matlal Fajri Alif May Efdi Melbi Mahardika Mirzah Mirzah Mochamad Asrofi Mohd Hafizi Ahmad Mohd Jain Noordin Muhammad Rizki Mulyati Sukma Naldi, Nofri Nancy Willian Nengsih, Zarnida Widia Neswati Neswati Novesar Jamarun Novesar Jamarun Novizar Nazir Oktavani, Herlin Olly Norita Tetra Putri Perdana Roza Radiatun Mardiah Rahadian Zainul Rahayu Rahayu Rahmayeni Ramadhani, Umi Reni Desmiarti Restina Bemis Restina Bemis, Restina Rianda - Rianda Rizal Rini Ramadhani Risma Sari Rosadi, Maulana Yusup Roza, Putri Perdana Rudy Fernandez Safni Safni Selfa Dewati Samah Sestry Misfadhila Shaleh, Baharuddin Sri Zulyanti Mardhiah Sry Wahyuni Suarnikan Hulu Suci Auliya Rahmi Elsya Sumaryati Syukur Sumaryati Syukur Suryati Suryati Syukri Syukri - Syukri Syukri Takashi Sugiura Theresia Sita Kusuma Upita Septiani Upita Septiani Usna, Sri Rahayu Alfitri Widya Yuliani Fatiha Yeni Stiadi Yessi Rahmayani Yestria Rilda Yetria Rilda Yetti Marlida Yulfitrin - Yuliartati Yuliartati Yulidar Laila Safitri Yulizar Yusuf Yurniwati Zilfa Zilfa Zulhadjri Zulhadjri