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IDENTIFIKASI SENYAWA MINERAL DAN EKSTRAKSI TITANIUM DIOKSIDA DARI PASIR MINERAL Zulfalina Zulfalina; Azwar Manai
Jurnal Sains Materi Indonesia Vol 5, No 2: FEBRUARI 2004
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

IDENTIFIKASI SENYAWA MINERAL DAN EKSTRAKSI TITANIUM DIOKSIDA DARI PASIR MINERAL. Telah dilakukan investigasi terhadap pasir mineral atau pasir besi untuk menentukan kandungan mineral dan hasil ekstrasinya. ldentiﬁkasi unsur di dalam pasir mineral menggunakan X-rayﬂuorescence, diperoleh bahwa unsur utama sebagai unsur majoritas adalah Fe dan Ti dengan fraksi berat masing-masing unsur sebesar 69,15% dan 13,58%, sedangkan sisanya terdiri dari unsur-unsur lain bersifat minor. Separasi magnetik terhadap pasir berhasil memisahkan antara bagian yang bersifat magnetik dan non-magnetik ditandai dengan meningkatnya fraksi berat unsur Fe menjadi 80,10% sedangkan Ti menjadi 11,06% di dalam pasir magnetik. Analisis difraksl sinar-x terhadap pasir magnetik memberikan informasi bahwa unsur-unsur major dalam pasir berupa senyawa magnetite, Fe3O4 dan ilmenit, FeTiO3 dengan fraksi berat untuk senyawa FeTiO3 dan Fe3O4 masing-masing adalah 15,67% dan 84,33%. Ekstraksi TiO2 dari pasir besi konsentrat telah berhasil dilakukan dengan cara pelarutan menggunakan H2SO4 dengan konsentrasi 7,5 M dan diperoleh hasil berupa endapan TiO2, dengan tingkat kemurnian mencapai ~85%. Proses ekstraksi TiO2 dengan cara ini menghasilkan tingkat efisiensi sebesar 35,75%.

The Enhancement and Study of Sintering Time Effect Toward Content of Fe and Ti Compounds in Mineral Sand Fauzi Fauzi; Zulfalina Zulfalina
Journal of Aceh Physics Society Volume 9, Number 2, May 2020
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v9i2.16614

Pasir mineral merupakan salah satu mineral endapan (sedimen) dengan ukuran butir 0,074-5 mm, ukuran kasar (5–3 mm) dan halus (1 mm), ciri fisik dari pasir mineral ini diantaranya berwarna hitam dan cenderung tertarik oleh magnet. Berdasarkan beberapa penelitian yang telah dilakukan sebelumnya didapatkan bahwa kandungan utama dari pasir mineral berupa mineral ilmenit (FeTiO3), hematite (Fe2 - O3), dan magnetit (Fe3O4). Oleh karena itu maka pasir mineral ini sangat potensial untuk menghasilkan logam Fe, Ti, besi oksida dan pigmen titanium oksida. Dalam penelitian ini pengayaan kandungan besi dilakukan dengan metode separasi magnetik kemudian dikarakterisasi menggunakan XRF. Selanjutnya sampel tersebut disinter pada suhu 800oC, dengan variasi waktu penahanan selama 2, 4 dan 6 jam dan di karakterisasi menggunakan XRD, dimana hasilnya dianalisis dengan metode GSAS. Hasil pengujian XRF menunjukkan bahwa pasir mineral murni (bahan mentah) mempunyai kandungan Fe dan Ti masing–masing 14,38 dan 2,80% (%berat), sedangkan setelah separasi magnetik kandungan Fe dan Ti meningkat masing–masing menjadi 83,51 dan 7,25% (%berat). Hasil analisis GSAS menunjukkan bahwa waktu sintering berpengaruh terhadap fraksi berat Fe dan Ti, ini ditunjukkan senyawa Fe3O4 menurun dari 81,85 menjadi 77,76% dan Fe2O3 dari 11,44 menjadi 3,41%, sementara FeTiO3 meningkat dengan bertambahnya waktu sintering dari 6,72 menjadi 18,83%. The mineral sand is one of the mineral sediments with grain size of 0.074 – 5 mm, coarse size (5–3 mm) and fine (1 mm). The physical characteristics of this mineral sand are black color and tend to be attracted by magnets. Based on several studies, the main content of mineral sand is ilmenite (FeTiO3), hematite (Fe2O3), and magnetite (Fe3O4). Therefore mineral sand is very potential to produce Fe, Ti, iron oxide and titanium oxide pigments. In this study, the iron contents from raw materials were enhanced by magnetic separation method, and then the samples were characterized using XRF. Therefore they were sintered at temperature 800oC and variation of holding times 2, 4 and 6 h. The characterization of sample used XRD, where this result is analyzed using GSAS method. The XRF results showed that pure mineral sand (raw materials), has Fe and Ti contents of 14.38 and 2.80% (%weight), whereas after magnetic separation, the Fe and Ti contents increased to 83.51 and 7.25%, respectively. The analysis result of GSAS showed that the sintering time affected the weight fraction of Fe and Ti. These indicated that Fe3O4 decreased from 81.85 to 77.76% and Fe2O3 from 11.44 to 3.41%, while FeTiO3 raise with increasing of sintering time from 6.72 to 18.83%. Keywords: Enhancement, sintering time, compound content, mineral sand, GSAS

Control of Corrosion Rate on A36 Black Plate Steel in Corrosive Medium Using Salam Leaf Extract Inhibitor Evi Yufita; Desy Fitriana; Zulfalina Zulfalina
Journal of Aceh Physics Society Volume 7, Number 2, May 2018
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (545.211 KB)

Pemanfaatan inhibitor organik untuk mengurangi laju korosi pada logam telah banyak diteliti karena ramah lingkungan dibandingkan dengan inhibitor anorganik. Dalam penelitian ini, ekstrak daun salam (Eugenia Polyantha (Wight.)Walp.) digunakan sebagai inhibitor untuk menghambat laju korosi pada baja plat hitam A36. Ekstrak daun salam digunakan sebagai inhibitor karena mengandung senyawa tannin dan flavonoid yang dapat menghambat laju korosi. Tujuan penelitian ini untuk mengetahui pengaruh dan efisiensi penambahan variasi volume inhibitor tersebut dalam medium korosif NaCl 3 % terhadap laju korosi pada baja plat hitam A36. Metode yang digunakan adalah kehilangan berat. Sampel direndam dalam larutan korosif yang dicampurkan dengan inhibitor. Dari hasil peneliti menunjukkan bahwa ekstrak daun salam mampu menghambat laju korosi. Nilai laju korosi terendah dan efisiensi tertinggi pada penambahan volume inhibitor 16 ml, masing-masing sebesar 0,0003 cm/tahun dan 99,80%. Organic inhibitors ultilization to reduce corrotion rate on metal have been widely studied due to more enfironmentally frendly compare to inorganic material. In this study, the extract of salam leaf (Eugenia Polyantha (Wight.) Walp.) was used as an inhibitor to reduce the corrosion rate on A36 black plate steel. Salam leaf extract is used as an inhibitor because it contains tannin and flavonoid compounds that can inhibit corrosion rate. The purpose of this study was to determine the effect and efficiency of adding variation of the inhibitor volume in a corrosive medium of 3% NaCl to the corrosion rate on A36 black plate steel. The method used is weight loss. The sample was immersed in a corrosive solution mixed with the inhibitor. From the results of the research show that the extract of Salam leaf can reduce corrosion rate. The lowest corrosion rate value and the highest efficiency at the addition of 16 ml inhibitor volume are 0.0003 cm/year and 99.80%, respectively. Keywords: Flavonoid, Inhibitor Effeciency, NaCl, Salam Leaf Extract, Tannin, Weight LossDaftar Pustaka Cicek, Volkan. 2014. Corrosion engeneering. Wiley. United State of America.Fatriah, Zulfalina, Evi yufita.2017.Pengaruh ekstrak daun trembesi sebagai inhibitor terhadap laju korosi pada baja plat hitam A36. J.Aceh Phys.Soc Vol.6, No.2 pp. 52-56. Jurusan Fisika Fakultas Matematika Ilmu Pengetahuan Alam Universitas Syiah Kuala.Indah wahyuutami. 2008. Efekfraksi air ekstrak etanol dalam daun salam terhadap penurunan kadar asam urat pada mancit putih jantang alurbalb-c yang di induksi dengan kalium oksonat. Skripsi. Universitas Muhammadiyah Surakarta.Rozanna Sri Irianty dan Khairat, 2013, Ekstrak Daun Pepaya sebagai Inhibitor Korosi pada Baja AISI 4041 dalam Medium Air Laut, Jurnal Teknobiologi, volume IV (2), RiauSupardi, Rahmat. 1997. Korosi. Tarsito. Bandung.Sari, M,D., Handani,S., Yetri,Y. 2013. Pengendalian laju korosi Baja St-37 dalam medium asam klorida dan natrium klorida menggunakan inhibitor ekstrak daun teh. Jurnal Fisika Fakultas MIPA. Vol.2 No.3. Universitas Andalas Padang.Yonna Ludiana dan Sri Handani, (2012). Pengaruh konsentrasi inhibitor ekstrak daunteh (Camelia Sinensis) terhadap laju korosi baja karbon schedule 40 grade BERW. Jurnal Fisika volume 1 No. 1 Universitas Andalas Padang.

The Potential of Red Dragon Fruit Skin (Hylocereanea Polyrhizus) as a Corrosion Inhibitor Beti Nanda Sari; Evi Yufita; Zulfalina Zulfalina
Journal of Aceh Physics Society Volume 8, Number 1, January 2019
Publisher : PSI-Aceh

Penelitian tentang pengaruh ekstrak kulit buah naga merah (Hylocereus Polyrhizus) sebagai bahan inhibitor terhadap laju korosi baja plat hitam (Base Plate) A36 dengan menggunakan metode weight loss telah dilakukan. Kulit buah naga merah berpotensi sebagai bahan inhibitor organik karena mengandung senyawa antioksidan diantaranya flavonoid dan tanin. Penelitian ini bertujuan untuk mengetahui pengaruh variasi volume larutan inhibitor yaitu 10, 20 dan 30 ml terhadap perubahan massa sampel, selain itu juga ingin mengetahui pengaruh variasi volume larutan inhibitor terhadap nilai laju korosi dan efesiensi inhibisi pada sampel baja A36. Berdasarkan hasil penelitian, perubahan massa didapat dari selisih massa sebelum dan sesudah perendaman dalam larutan inhibitor, nilai perubahan massa maksimum pada volume 30 ml yaitu sebesar 0,073 g. Nilai laju korosi relatif untuk sampel yang dilapisi inhibitor akan semakin menurun, pada volume 30 ml yaitu sebesar 0,001 cm/tahun dengan nilai efisiensi sebesar 98%. Research on the effect of red dragon fruit peel extract (Hylocereus Polyrhizus) as an inhibitor material on the corrosion rate of A36 black plate steel using weight loss method has been carried out. Red dragon fruit skin potential as an organic inhibitor that is containing antioxidant compounds include flavonoids and tannins. This study aims to determine the effect of variations in inhibitor solution volume for 10, 20 and 30 ml on changes in sample mass, the effect of variation in inhibitor solution volume on corrosion rate value and inhibitor efficiency of A36 steel samples is also studied. Based on the results of the study, changes in mass were obtained from the difference in mass before and after immersion in an inhibitor solution, the maximum mass change value at a volume of 30 ml is equal to 0.073 g, while the value of the corrosion rate is relatively decreasing. At a volume of 30 ml, the corrosion rate is equal to 0.001 cm/year with an efficiency value of 98%. Keywords: Korosi, Antioksidan, Kulit, Buah Naga Merah, efisiensi

Effect of Ceremai Leaf Extract (Phyllanthus acidus (L) Skeels) as Inhibitor Material on Corrosion Rate of Black Plate Steel (Base Plate) A36 Zulfalina Zulfalina; Nurrizka Nadia; Evi Yufita
Journal of Aceh Physics Society Volume 7, Number 2, May 2018
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (447.2 KB)

Penelitian tentang pengaruh ekstrak daun ceremai (Phyllanthus acidus (L) Skeels) sebagai bahan inhibitor terhadap laju korosi baja plat hitam (Base Plate) A36 dengan menggunakan metode weight loss telah dilakukan. Penelitian ini bertujuan untuk menghitung nilai laju korosi sampel baja A36 dan efesiensi inhibitor dari ekstrak etanol daun ceremai. Pembuatan inhibitor dilakukan dengan mengekstrak daun ceremai menggunakan metode maserasi. Hasil ekstrak dicampurkan ke dalam medium korosif NaCl 3% dengan variasi ekstrak 4, 8, 12, 16 dan 20 ml, kemudian dilakukan perendaman sampel baja plat hitam A36 yang berukuran 3x1,5x0,114 cm. Berdasarkan hasil penelitian didapatkan nilai laju korosi minimum pada perendaman dalam medium korosif NaCl 3% yang ditambahkan 16 ml inhibitor dengan waktu perendaman 14 hari yaitu 0,0339 cm/tahun dengan nilai efisiensi sebesar 88%. The research about effect of ceremai leaf extract (phyllanthus acidus (l) skeels) as inhibitor material on corrosion rate of black plate steel (Base Plate) A36 by using weight loss method has been done. This study aims to calculate the value of corrosion rate of A36 black plate steel samples and the efficiency of inhibitors from ethanol extract of ceremai leaf. Making the inhibitor is done by extracting the leaves of the ceremai using the maceration method. The extract was mixed into corrosive medium of NaCl 3% with variation of 4, 8, 12, 16 and 20 ml, and then immersion of A36 black plate steel sample 3x1.5x0.114 cm. Based on the result of the research, the minimum corrosive rate on soaking in corrosive medium of NaCl 3% when added of 16 ml inhibitor with immersion time for 14 d that is 0,0339 cm/year, and the efficiency value equal to 88 %. Keywords: Corrosion, Corrosion Rate, Efficiency, NaClReferensiAli, Farida, dkk. 2014. Pengaruh Waktu Perendaman dan Konsentrasi Ekstrak Daun Jambu Biji (Psidium guajava, Linn) sebagai Inhibitor Terhadap Laju Korosi Baja SS 304 dalam Larutan Garam, Jurusan Teknik Kimia Fakultas Teknik Universitas SriwijjayaAsdim. 2007. Penentuan Efisiensi Inhibisi Ekstrak Kulit Buah Manggis (Garcinia mangostana L) pada Reaksi Korosi Baja dalam Larutan Asam. Jurnal Gradien. 3 (2) : 273-276.Cicek, volkan. 2014. Corrosion Engineering. Wiley. USA.Fatriah. 2016. Pengaruh Ekstrak Daun Trembesi (Samanea Saman (Jacq.) Merr.) Sebagai Bahan Inhibitor Terhadap Laju Korosi Baja Plat Hitam (Base Plate) A36. J. Aceh.Phys. Soc. Vol. 6, No. 2.Favre. 1993. The Influence of Gallic Acid on the Reduction of Rust on Painted Steel Surface. Journal Corrosion Science 43.1483-1492.Kayadoe, Victor dan Rachel Turalely. 2016. Ekstrak Daun Nipah sebagai Inhibitor Korosi Baja Ss-304 Dalam Larutan H2SO4. Prosiding Seminar Nasional Kimia dan Pembelajarannya, ISBN : 978-602-0951-12-6 Jurusan Kimia FMIPA Universitas Negeri Surabaya.Priest. D. 1992. Measuring Corrosion Rates Fast. J. Chemical Engineering, vol : 2 no. 1.Rieger. 1992. Electrochemistry, 2nd ed. Chapman and Hall Inc. New York.Setiawan, Dalimartha. 1999. Atlas Tumbuhan Obat Indonesia Jilid 1, Jakarta : Trubus Agriwidy

Pengaruh Ekstrak Kulit Buah Naga Merah dan Daun Trembesi sebagai Penghambat Korosi pada Baja A36 dalam Larutan HCl 3% Evi Yufita; Zulfalina -; Muhammad Ilham Nur; Fatriah Fatriah; Zulkarnain Jalil
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): IJAP Volume 12 ISSUE 01 YEAR 2022
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.54625

Tumbuhan merupakan salah satu sumber daya alam yang dapat dimanfaatkan sebagai zat inhibitor organik. Inhibitor organik digunakan untuk mengatasi laju korosi terutama pada material yang mengandung logam. Penelitian ini bertujuan untuk mempelajari peluang beberapa ekstrak dari tumbuhan sehingga dapat dimanfaatkan sebagai inhibitor korosi berdasarkan nilai laju korosi dan efesiensi inhibisi. Tumbuhan yang digunakankan adalah buah naga merah (Hylocereus polyrhizus) dan daun trembesi (Samanea saman (Jacq.). Sampel ujinya berupa plat baja hitam A36 berdimensi 3 cm x 1,5 cm x 1,14 mm, dan medium korosif asam klorida (HCl) 3%. Variasi kosentrasi ekstrak inhibitor untuk masing-masing bahan yang ditambahkan ke dalam medium korosif HCl 3% sebesar 2, 4, 6, 8 dan 10 mL. Perhitungan laju korosi menggunakan metode kehilangan berat (weightloss). Dari hasil penelitian, nilai laju korosi terendah untuk inhibitor ekstrak kulit buah naga merah terdapat pada penambahan inhibitor 10 mL sebesar 0,0463 cm/yr dengan efisiensinya 91,89 %. Sedangkan nilai laju korosi terendah untuk inhibitor ektrak daun trembesi terjadi pada penambahan inhibitor 10ml sebesar 0,0066 cm/year dengan efisiensi 98,9 %. Dari hasil penelitian tersebut dapat disimpulkan bahwa kulit buah naga merah dan daun trembesi mampu menurunkan laju korosi yang terjadi pada baja, sehingga memiliki peluang alternatif untuk dijadikan sebagai inhibitor organik.

Determination of the crystallite size and crystal structure of magnesium powder by x-ray diffraction ISMAIL ISMAIL; RESI MULIANI; ZULFALINA ZULFALINA; SITI HAJAR SHEIKH MD FADZULLAH
Jurnal Natural Volume 20 Number 3, October 2020
Publisher : Universitas Syiah Kuala

Magnesium powder has become an important material in the development of science and technology such as alloy and hydrogen storage. In this work, the chemical composition, crystallite size, and crystal structure of the magnesium powder sample have been studied by using x-ray fluorescent and x-ray diffraction. The x-ray diffraction data of the magnesium powder sample was analyzed by using the Rietveld method to obtain the crystal structure. Our results show that the purity of our magnesium powder sample is 93.1%. Our sample has good crystallinity with the average crystallite size of 31 nm. The crystal structure is found to be a hexagonal closed-packed structure with the lattice constants of 3.2100 Å (a and b-axis) and 5.2107 Å (c-axis). Our result revealed that the lattice constant in the c-axis of magnesium powder is influenced by impurity. This finding suggests that the impurity can affect the crystal structure of a material in general.

Determination of the crystallite size and crystal structure of magnesium powder by x-ray diffraction ISMAIL ISMAIL; RESI MULIANI; ZULFALINA ZULFALINA; SITI HAJAR SHEIKH MD FADZULLAH
Jurnal Natural Volume 20 Number 3, October 2020
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v20i3.16584

Magnesium powder has become an important material in the development of science and technology such as alloy and hydrogen storage. In this work, the chemical composition, crystallite size, and crystal structure of the magnesium powder sample have been studied by using x-ray fluorescent and x-ray diffraction. The x-ray diffraction data of the magnesium powder sample was analyzed by using the Rietveld method to obtain the crystal structure. Our results show that the purity of our magnesium powder sample is 93.1%. Our sample has good crystallinity with the average crystallite size of 31 nm. The crystal structure is found to be a hexagonal closed-packed structure with the lattice constants of 3.2100 Å (a and b-axis) and 5.2107 Å (c-axis). Our result revealed that the lattice constant in the c-axis of magnesium powder is influenced by impurity. This finding suggests that the impurity can affect the crystal structure of a material in general.

Optimalisasi Pemberdayaan Laboratorium IPA dalam Upaya Meningkatkan Pemahaman Konsep-konsep Fisika bagi Guru IPA dan Siswa di Madrasah Aliyah Rajibussalim Rajibussalim; Evi Yufita; Zulfalina Zulfalina; Faisal Abdullah; Teuku Maimun
PESARE: Jurnal Pengabdian Sains dan Rekayasa Vol 1, No 1 (2023): Oktober 2023
Publisher : Universitas Syiah Kuala

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A Science Laboratory at Senior High School is an important facility for students in learning Sciences, Technology, Engineering and Mathematics (STEM). Students learn concepts in the classroom and should be able to test and/or prove those concepts in experiments in Science Lab. However, many Science laboratories at schools were not fully operated due to the lack of skillful teachers or lab assistants who can manage Science laboratories with the highest standard and be able to conduct experiments with available KITs in those laboratries. Based on this phenomenon, a group of lecturers from Physics Department of Syiah Kuala University conducted a community service at school in order to share insights and skills related to a good practice in Laboratory management and demonstated how to run Physics experiments with available KITs at a designated school laboratory. The participants of this event were Science teachers and students at the school. Some of the outcomes of this community service are the increase in Laboratory management skills among science teachers at this school and increase in ability to utilise available Science KITs at that school for Physics experiments. The teachers and students were very happy and antusias to participate in this program and be benefited from this activity

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