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All Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI Teknotan: Jurnal Industri Teknologi Pertanian Jurnal Natur Indonesia Jurnal Sains Materi Indonesia Jurnal Penelitian Hasil Hutan Dharmakarya : Jurnal Aplikasi Ipteks Untuk Masyarakat The Journal of Pure and Applied Chemistry Research Journal of Mathematical and Fundamental Sciences Jurnal Keramik dan Gelas Indonesia Indonesian Journal of Science and Technology Al-Kimia Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Indonesian Mining Journal Indonesian Journal of Chemistry Jurnal Kartika Kimia Jambura Journal of Chemistry Molekul: Jurnal Ilmiah Kimia JKPK (Jurnal Kimia dan Pendidikan Kimia) Indonesian Physical Review Jurnal Penyuluhan Perikanan dan Kelautan Al-Khidmat : Jurnal Ilmiah Pengabdian Kepada Masyarakat Jurnal Penelitian Hasil Hutan Jurnal Keramik dan Gelas Indonesia Asean Journal of Science and Engineering (AJSE) Jurnal Ilmiah Berkala Sains dan Terapan Kimia Makara Journal of Science Gunung Djati Conference Series Jurnal Kimia dan Rekayasa Jurnal Material dan Energi Indonesia Jurnal Teknologi Lingkungan Bulletin of Chemical Reaction Engineering & Catalysis Indonesian Mining Journal al Kimiya : Jurnal Ilmu Kimia dan Terapan ETHOS: Jurnal Penelitian dan Pengabdian kepada Masyarakat Jurnal Penelitian Hasil Hutan
Atiek Rostika Noviyanti
Departemen Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Padjadjaran
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Study of The Interaction Carbondioxide Gas with Hydroxyapatite Using Density Functional Theory Atiek Rostika Noviyanti; Azhari Yusuf; Yeni Wahyuni Hartati; Budi Adiperdana
Jurnal Keramik dan Gelas Indonesia Vol 30, No 2 (2021): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v30i2.7175

Abstract

Hydroxyapatite (HA) is a phosphate mineral with Ca10(PO4)6(OH)2 chemical formula. The hydroxyl group in HA allows ion to exchange, so this material may be applied as a CO2 gas sensor. The interaction between HA with CO2 gas is difficult to observe directly, and ab initio modeling is necessarily to investigate the interactions between HA with CO2 gas. In this study, a simulation was conducted using the density functional theory method to determine the interaction between CO2 gas on the surface of HA. The simulation results indicate that a large HA surface is required for optimal CO2 gas adsorption. Pore diameter size needs to be larger than 2.5 Å to prevent binding on two sides of the surface pores. 
SYNTHESIS AND CHARACTERIZATION OF GAMMA ALUMINA AND ITS ADSORPTION CAPABILITY TEST FOR POMALAA MAGNESIUM LATERITE, SOUTHEAST SULAWESI Titin Siti Fatimah; Atiek Rostika Noviyanti; Juliandri Juliandri; Solihudin Solihudin
Indonesian Mining Journal Vol 22, No 1 (2019): INDONESIAN MINING JOURNAL, Vol. 22 No. 1, April 2019
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1748.461 KB) | DOI: 10.30556/imj.Vol22.No1.2019.977

Abstract

Based on variations in calcination temperature, gamma alumina has successfully been made using a simple sol-gel method for Pomalaa magnesium-laterite adsorption from the South East of Sulawesi. The laterite leached by sulfuric acid was then precipitated by ammonia, to make the magnesium was separated from its main impurities (Si, Fe and Al). Temperature variations at 500, 650, 800 and 950 °C in gamma alumina making formed the gamma alumina phase while the alpha alumina phase was formed at 1100 °C. The higher calcination temperature the lower the specific surface area respectively from 196.385, 156.239, 105.725, 96.134 and 15.396 (m2/g). This results in decreasing the magnesium of the laterite 9.04, 8.70, 8.09, 6.39 and 0.29 (mg/L) respectively. The 800 °C-calcination gamma alumina has the highest volume of the pore, namely 0.3265 mL/g and the radius of 61.76 Å. The gamma alumina isotherm curve is type IV. The SEM-EDS test shows an aggregation spherical shape. Gamma alumina was detected to adsorb Mg laterite. The X-ray mapping of SEM-EDS test shows even distribution between gamma alumina, magnesium and nickel. The highest adsorption is retained by GA-800/3 sample, namely 81.31 %.
Photocatalytic Degradation of Diazinon Using Titanium Oxide Synthesized by Alkaline Solvent Mohammad Rofik Usman; Atiek Rostika Noviyanti; Diana Rakhmawaty Eddy
Indonesian Journal of Chemistry Vol 17, No 1 (2017)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (639.362 KB) | DOI: 10.22146/ijc.23548

Abstract

Photoactivity of titanium dioxide (TiO2) can be improved by turning it into nanoparticles. Synthesis of TiO2 nanoparticles can be done by using hydrothermal method. Hydrothermal method is influenced by types of precursor, hydrothermal conditions, including time, temperature, type and concentration of reactants. The purpose of this study is to obtain a hydrothermal condition which produces crystals of TiO2 nanoparticles with high quality. The material used was titanium tetrachloride (TiCl4) as initial precursors and for the type of reactants was used aqudestilate, aquabidestilate, ethanol, t-butanol, sodium hydroxide (NaOH) and potassium hydroxide (KOH). The resulting diffractogram showed the crystal structure of TiO2 nanoparticles with anatase and rutile. Based on calculations using the scherrer equation, TiO2 crystal obtained had a crystal size below 50 nm in both anatase and rutile. The percentage of rutile and anatase composition was obtained by using rietveld method with the help of rietica software. Morphology of TiO2 anatase showed particles with shape of cubic, while rutile was flower-shaped.
Kalsium Silikat sebagai Bahan Komposit Biosemen Gigi dengan Penyiapan Silika dari Sekam Padi melalui Metode Sol-Gel Haryono MT; Diana Rakhmawaty Eddy; Atiek Rostika Noviyanti; Solihudin Solihudin; Laelaturrohmah Laelaturrohmah
Jurnal Kartika Kimia Vol 1 No 1 (2018): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, Jenderal Achmad Yani University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (263.245 KB) | DOI: 10.26874/jkk.v1i1.4

Abstract

Rice husk has the content of organic and inorganic compounds that have not been utilized maximally, one of them is silica. High silica content in rice husks can be used as an alternative source of potential silica for the synthesis of calcium silicate as a base material of Trioxide Aggregate mineral composites in tooth biocement. In this study, calcium silicate was obtained through two stages of the process, namely silica isolation from rice husk ash by sol-gel method, and reacting between silica and calcium oxide. Silica and calcium oxide are reacted to the mole ratio between silica to calcium oxide of 7:3, 6:4, 4:6, and 3:7. The isolated silica is characterized by the distribution of the size and composition of each element with Particle Size Analyzer (PSA) and EDS. The formation of calcium silicate and its size distribution from the synthesis stage is determined by XRD and PSA. The result showed that silica isolation from rice husk ash with sol-gel method obtained silica with content and particle size of 71.6% and 52.82 mm. While the optimum condition of calcium silicate synthesis was achieved at the mole ratio of silica to calcium oxide by 4:6. In the mole ratios obtained calcium silicate type b-dicalcium silicate with an average particle size of 102.2 mm.
KOMPOSIT KARBON ZEOLIT BERBAHAN DASAR SEKAM PADI Yati B Yuliyati; Solihudin Solihudin; E Evy Ernawati; Atiek Rostika Noviyanti; Rizka Endah
Jurnal Sains dan Terapan Kimia Vol 11, No 1 (2017)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (248.07 KB) | DOI: 10.20527/jstk.v11i1.3167

Abstract

Iron (II) Removal Using Activated Silica/Lignin Composite: Kinetic and Equilibrium Studies Atiek Rostika Noviyanti; Yati B Yuliyati; Ghaissani Nur Maulani; Irwan Kurnia
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 8, No. 1, May 2022
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v8i1.22715

Abstract

Recently, the Indonesian industry has been rapidly developed and affects the number of heavy metal ions waste such as iron (II). Iron (II) is dangerous to the environment because it is harmful to aquatic systems and carcinogenic. This research used activated silica/lignin to remove iron (II) in water. The activated silica/lignin was isolated from rice husk and activated by sodium periodate with a 10% weight of lignin in the range of pH of 2–5 at 55 °C. Then its specific surface area was analyzed with the methylene blue adsorption method. It is found that the condition in pH 2 showed the best isolation and activation condition to achieve the lowest impurity (cellulose and hemicellulose) in silica/lignin composite. Furthermore, the activated silica/lignin composite, isolated in pH 2, has a specific surface area of 366.6372 m2/g with the highest adsorption value of 1.1825 mg g-1 for iron (II) ions solution (5 ppm) within a contact time of 90 minutes. Moreover, the adsorption kinetics followed the pseudo-second-order kinetic model, also the adsorption isotherm fitted with the Freundlich model. This research showed that activated silica/lignin could be used as an alternative of environmentally friendly material for iron (II) removal in water.
Thermomechanical Analysis of Various Solid-oxide-fuel-cell Components Using Simple Analog Micrometer Measurements Malik, Yoga Trianzar; Noviyanti, Atiek Rostika; Lestari, Putri Rizka
Makara Journal of Science Vol. 24, No. 1
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The solid oxide fuel cell (SOFC) is a device that can convert the energy stored in gaseous chemicals such as hydrogen into electricity. Because SOFCs are operated at high temperatures, their structures must be stable and durable. The thermomechanical compatibility of SOFC components is the main issue, as negligence in regard to material compatibility leads to cell destruction. In this study, we investigated the thermal expansion coefficient (TEC) of SOFC components, which characterizes their thermomechanical properties. We measured the TEC value of various electrolyte and electrode materials [La9.33Si4O26 (LSO), Ce0.9Gd0.1O1.92 (CGO), La0.8Sr0.2Ga0.8Mg0.2O2.55 (LSGM), LSO-CGO, LSO-LSGM, and La0.7Ca0.3MnO3 (LCM)] using an analog micrometer at temperatures between 298 K and 1073 K. The obtained TEC values matched well with the theoretical references, with errors between 1.80% and 8.00% for LSO, CGO, LSGM, and LCM. The TEC of composite SOFC materials, LSO-LSGM and LSO-CGO, were 10.29 × 10−6 K−1 and 10.10 × 10−6 K−1, respectively. Given the slight difference in their TEC values, these electrolytes would thermomechanically match an LCM cathode.
KARAKTERISTIK PRODUK DARI ESTERIFIKASI DENGAN BANTUAN GELOMBANG ULTRASONIK TERHADAP MINYAK BIJI KAPUK TEROZONASI Haryono Haryono; Engela Evy Ernawati; Atiek Rostika Noviyanti
Jurnal Penelitian Hasil Hutan Vol 40, No 3 (2022): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2022.40.3.144-154

Abstract

Minyak biji kapuk merupakan minyak non-pangan, sehingga sangat menguntungkan sebagai bahan baku pembuatan biodiesel. Namun minyak biji kapuk didominasi oleh asam lemak rantai panjang dan tak jenuh. Jenis asam lemak tersebut cenderung akan mengurangi kualitas biodiesel yang dihasilkan, yaitu rendahnya bilangan setana dan dapat memicu reaksi polimerisasi selama pembakaran. Ozonasi dapat diterapkan untuk memperpendek rantai karbon dan jumlah ikatan rangkap pada asam lemak dari minyak biji kapuk. Penelitian ini bertujuan untuk mempelajari pengaruh waktu ozonasi pada tahap penyiapan minyak biji kapuk terhadap karakteristik produk dari tahap esterifikasi dengan bantuan ultrasonikasi. Waktu ozonasi divariasikan selama 60, 90, dan 120 menit. Esterifikasi dilakukan selama 30 menit pada suhu 60°C dengan bantuan gelombang ultrasonik pada frekuensi 35 kHz. Hasil penelitian menunjukkan bahwa semakin lama waktu ozonasi dihasilkan minyak biji kapuk dengan bilangan asam semakin meningkat. Peningkatan bilangan asam dari minyak biji kapuk tersebut dan diverifikasi dengan komposisi asam lemak dari hasil analisis dengan Khromatografi Gas-Spektroskopi Massa, menunjukkan bahwa struktur asam lemak pada minyak biji kapuk menjadi lebih sederhana. Esterifikasi selama 30 menit terhadap minyak biji kapuk yang telah diozonasi menghasilkan fase minyak dengan bilangan asam 10,6 mg KOH/g, bilangan penyabunan 112 mg KOH/g, dan densitas 903 kg/m3.
Effect of Sensitive pH on Hydroxyapatite Properties Synthesized from Chicken Eggshell Ferli Septi Irwansyah; Azhari Yusuf; Diana Rakhmawaty Eddy; Risdiana Risdiana; Atiek Rostika Noviyanti
Indonesian Journal of Chemistry Vol 22, No 5 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.72959

Abstract

The hydrothermal method has effectively synthesized hydroxyapatite (HA). This study aimed to analyze the effect of pH on the properties (purity, crystallinity, and size) of HA crystals. HA synthesis of chicken eggshells was carried out using the hydrothermal method at temperatures of 230 °C with pH 9 and 9.34. The characteristics of HA are determined by XRF, XRD, FTIR, and TEM. The composition of the most significant compound obtained from the results of XRF analysis is CaO (97.5%). The XRD analysis showed that the purity of HA with pH 9.00 and 9.34 obtained was 97.8 and 96.6%, with the crystallinity of 56.46 and 56.96%. It was also obtained that the size of crystal HA was 21.8 and 15.7 nm for samples synthesized at pH 9.00 and 9.34. The results showed that the purity and size of HA were affected by differences in the pH synthesis and were relatively the same for its crystallinity which directly affects the value lattice parameter. The properties of HA produced by the hydrothermal method have met the criteria for biomedical applications.
KARAKTERISTIK PRODUK DARI ESTERIFIKASI DENGAN BANTUAN GELOMBANG ULTRASONIK TERHADAP MINYAK BIJI KAPUK TEROZONASI Haryono Haryono; Engela Evy Ernawati; Atiek Rostika Noviyanti
Jurnal Penelitian Hasil Hutan Vol 40, No 3 (2022): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2022.40.3.144-154

Abstract

Minyak biji kapuk merupakan minyak non-pangan, sehingga sangat menguntungkan sebagai bahan baku pembuatan biodiesel. Namun minyak biji kapuk didominasi oleh asam lemak rantai panjang dan tak jenuh. Jenis asam lemak tersebut cenderung akan mengurangi kualitas biodiesel yang dihasilkan, yaitu rendahnya bilangan setana dan dapat memicu reaksi polimerisasi selama pembakaran. Ozonasi dapat diterapkan untuk memperpendek rantai karbon dan jumlah ikatan rangkap pada asam lemak dari minyak biji kapuk. Penelitian ini bertujuan untuk mempelajari pengaruh waktu ozonasi pada tahap penyiapan minyak biji kapuk terhadap karakteristik produk dari tahap esterifikasi dengan bantuan ultrasonikasi. Waktu ozonasi divariasikan selama 60, 90, dan 120 menit. Esterifikasi dilakukan selama 30 menit pada suhu 60°C dengan bantuan gelombang ultrasonik pada frekuensi 35 kHz. Hasil penelitian menunjukkan bahwa semakin lama waktu ozonasi dihasilkan minyak biji kapuk dengan bilangan asam semakin meningkat. Peningkatan bilangan asam dari minyak biji kapuk tersebut dan diverifikasi dengan komposisi asam lemak dari hasil analisis dengan Khromatografi Gas-Spektroskopi Massa, menunjukkan bahwa struktur asam lemak pada minyak biji kapuk menjadi lebih sederhana. Esterifikasi selama 30 menit terhadap minyak biji kapuk yang telah diozonasi menghasilkan fase minyak dengan bilangan asam 10,6 mg KOH/g, bilangan penyabunan 112 mg KOH/g, dan densitas 903 kg/m3.
Co-Authors Adhitya Pratama Adzkia, Qurratu Aini Alya Akrajas Ali Umar Akrajas Ali Umar Akrajas Ali Umar Alfi Ikhlasul Amal Alfi Ikhlasul Amal Alfian Nur Firdaus Alfian Raymondo Sinurat Allyn Pramudya Sulaeman Amal, Alfi Ikhlasul Anceu Murniati Anni Anggraeni Anni Anggraeni, Anni Arie Hardian Arini Nurisydayanti Gumilar Asman Asman Asril Pramutadi Andi Mustari Ayu Wanda Marita Azhari Yusuf Azhari Yusuf Azman Bin Ma'Amor Azmi Prasasti Bambang Prijamboedi Basril Simbarta Tarigan Budi Adiperdana Budiman, Yudha Prawira Cecep Kusmana Chicilia, Novia Claudia Agesti Dani Gustaman Syarif Dani Gustaman Syarif Dani Gustaman Syarif Dayu Kusuma, Hersandy Diana Rakhmawaty Diana Rakhmawaty Diana Rakhmawaty Eddy Dickry Abil Barry Pratama Diding Mandala Putra Dini Fitriani Dini Janati Diyanthi, Erlinda Widyasmara E Evy Ernawati E. Evy Ernawati Eddy, Diana Rakhmawati Efri Mardawati Eko Prabowo Hadisantoso, Eko Prabowo Eleonora Agustine Engela Evy Ernawati Engela Evy Ernawati Fajar Firmansyah Ferli Septi Irwansyah Firmansyah, Fajar Gani Abdilah Gerald Tamuntuan Ghaissani Nur Maulani Gustaman Syarif, Dani Halim, Riyan Hanapratiwi, Reinanda HARYONO Haryono Haryono Haryono Haryono Hemzah, Sabila Aulia Hendri Setiawan Hersandy Dayu Kusuma Hutabarat, Geofanny S I Nyoman Marsih Iman Rahayu Irwan Kurnia Irwan Kurnia Ismunandar Ismu Iwan Hastiawan Iwan Hastiawan Iwan Hastiawan Iwan Hastiawan Jasmansyah, Jasmansyah Juliandri Juliandri Juliandri Kartika Hajar Kirana Karya, Teguh Kurnia, Irwan Laelaturrohmah Laelaturrohmah Lestari, Putri Rizka Lubis, Rubianto A. Ma'Amor, Azman Bin Malik, Yoga Trianzar Maqsudi, Shobir Muntahal Maryani, Eneng Mastuti Widi Lestari Mastuti Widi Lestari, Mastuti Widi Ma’amor, Azman Meliani, Tiara Ayu Mochammad Rizal Mochammad Rizal Mohammad Rofik Usman Muhamad Rozaq Nur Fauzi Muhammad Raihan Gemilang Muhammad Reza Muhammad Rizky Ridwansyah Muhammad, Irfan Handi Mukhamad Nurhadi Mukhamad Nurhadi, Mukhamad Nafisah, Aulia Zakiyatun Nisrina, Aniqa Novella, Indrika Nur Akbar Nur Akbar, Nur Nur Azizah Ferdiana Nurhayati, Mita Pandu, Rinal Qodir, Dzikri T Rahmadona, Nova Ratna Kusumawardani, Ratna Reinanda Hanapratiwi Riansyah Amynurdin Rihan Amila Putri Rinal Pandu Risdiana Risdiana RISDIANA RISDIANA, RISDIANA Rizka Endah Roekmiati Tjokronegoro Roekmiati Tjokronegoro, Roekmiati Rofifah, Sinthia Anis Rubianto A. Lubis Rukiah Rukiah Rukiah Rukiah Rukiah Rukiah Rukiah Rukiah Rukiah Rukiah Rustaman Rustaman S SOLIHUDIN S Solihudin, S S. Suryana Sahrul Hidayat Sarifah Nurjanah Seli Listiani Shariffuddin Bin Md Zain Solihudin Solihudin Solihudin, Solihudin Solihudin, Solihudin Sovia Islamiah Staustan, Nafisah Suryana Suryana Syamsiyatul Fajriyah TATI NURHAYATI Titin Siti Fatimah Titin Siti Fatimah Wahyu Safriansyah Walim Lili Yashfi, Difa Muhammad Yati B Yuliyati YATI B YULIYATI Yati B Yuliyati Yati B Yuliyati Yati B Yuliyati, Yati B Yati B. Yuliyati Yati B. Yuliyati Yati B. Yuliyati Yati B. Yuliyati Yeni Wahyuni Hartati Yoga Trianzar Malik Yuli Andriani YULIANDRI Yusi Deawati Yusi Deawati