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All Journal VALENSI Jurnal Sains Materi Indonesia Jurnal Ilmiah Arena Tekstil Indonesian Journal of Science and Technology Science and Technology Indonesia Al-Kimia Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry PENDIPA Journal of Science Education Jurnal Kartika Kimia Molekul: Jurnal Ilmiah Kimia Asean Journal of Science and Engineering (AJSE) Bulletin of Chemical Reaction Engineering & Catalysis Einstein's: Research Journal of Applied Physics al Kimiya : Jurnal Ilmu Kimia dan Terapan

Diana Rakhmawaty Eddy

Departemen Kimia, FMIPA, Universitas Padjadjaran

Author-ID : 748736

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics

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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

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

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.

Sintesis dan Karakterisasi Nanopartikel Zirkonia Terstabilkan Kalsium (CSZ) Berbasis Prekursor Zirkonium Hidroksida dari Pasir Zirkon Menggunakan Templat Etilen Glikol Hasna Rofifah Novianti; Eneng Maryani; Diana Rakhmawaty Eddy; Solihudin Solihudin; Ferry Arifiadi; Dewi Idamayanti
Chimica et Natura Acta Vol 10, No 2 (2022)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v10.n2.40335

Zirkonia yang distabilkan (stabilized zirconia) sangat menjanjikan karena memiliki sifat fisik, mekanik, termal, serta biokompatibilitas yang baik. Penelitian terkini memperlihatkan zirkonia yang distabilkan dapat digunakan pada bidang lingkungan, elektrolit, dan katalis. Zirkonia memiliki tiga fase yang stabil pada rentang suhu berbeda yaitu fase monoklinik, tetragonal dan kubik. Transformasi yang terjadi dari fase tetragonal ke monoklinik menyebabkan terjadinya retak mikro. Zirkonia perlu ditambahkan doping untuk dapat stabil selama pendinginan setelah tahap kalsinasi. Telah dilakukan sintesis zirkonia yang distabilkan dengan penambahan doping CaCl2 sebesar 1, 5 dan 10% b/b serta variasi suhu 600, 800 dan 1000°C untuk melihat pengaruhnya terhadap pembentukan fase ZrO2. Metode yang digunakan pada penelitian ini adalah metode sol-gel sehingga diperoleh calcia stabilized zirconia (CSZ) berukuran nano menggunakan bantuan etilen glikol sebagai templat. Hasil FTIR menunjukkan ikatan Ca-O muncul pada area sidik jari 455,9 cm-1. Ikatan Ca-O ini tumpang tindih dengan ikatan Zr-O pada daerah sidik jari 509,6 cm-1 (m-ZrO2) dan 754,16 cm-1 (t-ZrO2). Pengaruh doping dan suhu kalsinasi terhadap fase pembentukan nanopartikel CSZ dipelajari menggunakan difraksi sinar-X menunjukkan fase tetragonal teridentifikasi pada suhu kalsinasi 800°C dan fase monoklinik teridentifikasi pada suhu kalsinasi 1000°C. Konsentrasi CaCl2 mempengaruhi transformasi fase ZrO2, semakin tinggi konsentrasi CaCl2 yang ditambahkan ke dalam ZrO2 maka semakin stabil fase tetragonal ZrO2 pada sampel CSZ. Hasil morfologi dipelajari menggunakan TEM dan SEM menunjukkan nanopartikel dengan ukuran rata-rata 11-25 nm berbentuk aglomerasi dengan sebagian besar memiliki partikel berbentuk sferik dan sebagian kecil berbentuk nanorod dan nanotube.

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

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.

Silica from Natural Sources: a Review on the Extraction and Potential Application as a Supporting Photocatalytic Material for Antibacterial Activity Annisa Luthfiah; Yusi Deawati; M. Lutfi Firdaus; Iman Rahayu; Diana Rakhmawaty Eddy
Science and Technology Indonesia Vol. 6 No. 3 (2021): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Silica has become a popular material due to its high abundance and many advantages in various fields. This material can be produced synthetically and extracted from nature with resultant advantages in the application of green production. Therefore, this article deals with the form of silica extracted from quartz sand, leaves, and agricultural wastes found in nature. The extraction process from various sources would be described using thermal, biological, and chemical methods. This review also highlights the potential application of silica as a photo catalytic antibacterial-supporting material and discusses its role in increasing the effectiveness of the process. The discussion was continued with research on this procedure, where synthetic auxiliary materials were compared to the extracted silica. Furthermore, results obtained indicated that the extracted material had very good potential as a photocatalyst adjunct in its application in the antibacterial field.

Pelapisan Komposit TiO2-SiO2 pada Kain Poliester dengan Metode Dip Coating pada Pembuatan Masker Hidrofobik Antivirus Rifky Adhia Pratama; Yuni Nurhayati; Dea Fauziah Fitri; Ahlam Nauval Mahendra; Kiagus Ahmad Mirza Azuri; Diana Rakhmawaty Eddy
ALCHEMY Jurnal Penelitian Kimia Vol 18, No 1 (2022): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.18.1.55003.95-102

Penelusuran potensi komposit TiO2-SiO2 (sumber silika dari abu sekam padi) sebagai material coating untuk pembuatan masker kain yang hidrofobik dan memiliki sifat antivirus merupakan tujuan utama dalam penelitian ini. Metode yang digunakan untuk sintesis komposit TiO2-SiO2 adalah metode sol-gel. Adapun proses coating dilakukan dengan metode dip coating. Hasil karakterisasi PSA menyatakan bahwa rata-rata ukuran partikel silika dari abu sekam padi yang terbentuk adalah 202,98 nm. Tipe kristal komposit TiO2-SiO2 yang terkonfirmasi XRD adalah campuran fase anatase dan brookite. Hasil SEM memperlihatkan bahwa komposit yang telah disintesis menempel kuat di serat-serat kain, yang mengindikasikan bahwa proses coating berjalan sempurna. Hasil pengujian sudut kontak menunjukkan bahwa kain hasil coating bersifat hidrofobik karena memiliki nilai sudut 110,4°. Suhu permukaan kain hasil coating yang dikarakterisasi dengan thermal camera menunjukkan hasil yang baik karena hanya dalam kurun waktu 10 menit iradiasi sinar UV-C, suhu permukaannya sudah melebihi 40 °C. Oleh karena itu, kain hasil coating memiliki potensi besar untuk diaplikasikan menjadi masker antivirus karena receptor binding motif dari protein spike SARS-CoV-2 mulai mengalami penutupan konformasi pada suhu 40 °C. TiO2-SiO2 Composite Coating on Polyester Fabrics using Dip Coating Method for Antivirus Hydrophobic Mask Fabrication. Exploring the potential of TiO2-SiO2 composite (a silica source obtained from rice husk ash) as a coating material for the manufacture of hydrophobic and antiviral fabric masks is the main goal of this study. The sol-gel method is used in the manufacture of TiO2-SiO2 composites. The coating process is carried out using a dip coating method. The results of PSA characterization show that the average silica particle size formed was 202.98 nm. The XRD confirmed that the TiO2-SiO2 composite crystal type is a mixture of anatase and brookite phases. The SEM shows that that the synthesized composite adheres strongly to the fabric fibers, indicating that the coating process runs perfectly because it is clearly seen. The results of the contact angle test show that the coated fabric is hydrophobic because it has an angle value of 110.4°. The surface temperature of the coated fabric characterized by a thermal camera shows good results because in just 10 minutes of UV-C irradiation, the surface temperature has exceeded 40 °C. Therefore, the coated fabric has a great potential to be applied as an antiviral mask because the receptor binding motif of the SARS-CoV-2 spike protein begins to undergo conformational closure at 40 °C.

How to Make and Characterize Hydroxyapatite from Eggshell Using the Hydrothermal Method: Potential Insights for Drug Delivery System Ferli Septi Irwansyah; Alfi Ikhlasul Amal; Eko Prabowo Hadisantoso; Atiek Rostika Noviyanti; Diana Rakhmawaty Eddy; Risdiana Risdiana; Suryana Suryana; Shariffuddin Bin Md Zain
Indonesian Journal of Science and Technology Vol 8, No 3 (2023): (ONLINE FIRST) IJOST: December 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i3.60825

Hydroxyapatite (HA) has garnered significant attention as a versatile biomaterial with promising applications in drug delivery systems. This study aimed to synthesize and characterize HA derived from eggshells using the hydrothermal method and explore its potential insights for drug delivery systems. We delivered a step-by-step process to produce HA using a hydrothermal method, supported by several analyses, X-Ray Diffraction (XRD) to analyze the crystallinity structure, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Particle Size Analyzer (PSA), and Brunauer-Emmett-Teller (BET). The stage is continued with a study on the potential of HA as a drug delivery system with UV-Visible spectrophotometer instrumentation. The results suggest that the characterized HA suits drug delivery systems due to its favorable properties. This study contributes to the understanding of utilizing hydroxyapatite from eggshells as a viable material for drug delivery systems, opening avenues for further research and development in this field.

Degradation of Ciprofloxacin by Titanium Dioxide (TiO2) Nanoparticles: Optimization of Conditions, Toxicity, and Degradation Pathway Mohammad Rofik Usman; Azmi Prasasti; Sovia Islamiah; Alfian Nur Firdaus; Ayu Wanda Marita; Syamsiyatul Fajriyah; Atiek Rostika Noviyanti; Diana Rakhmawaty Eddy
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 4 Year 2021 (December 2021)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.4.11355.752-762

The popular use of ciprofloxacin is often irrational, so it causes environmental pollution such as resistance. The solution to overcome environmental pollution due to ciprofloxacin is degradation by using TiO2 nanoparticles. TiO2 nanoparticles performance is influenced by environment such as light source, pH solvent, duration of lighting and TiO2 nanoparticles mass. The residual levels determination of ciprofloxacin was carried out by using a UV-Vis spectrophotometer. Toxicity test of ciprofloxacin degradation products with TiO2 nanoparticles used Escherichia coli bacteria. Liquid Chromatography Mass Spectrometry (LCMS) was used to determine the type of ciprofloxacin degradation product with TiO2 nanoparticles. The optimum condition for the ciprofloxacin degradation with TiO2 nanoparticles is lighting for 5 hours by using a white mercury UV lamp and 50 mg TiO2 nanoparticles with pH solvent of 5.5. The toxicity of ciprofloxacin degradation product with TiO2 nanoparticles was low. The smallest degradation product identified with m/z was p-fluoraniline (m/z 111). 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).

Effect of Low Solid/Liquid Ratio on Hydrothermal Synthesis of Hydroxyapatite with Green Template from Banana Flower (Musa acuminata Cavendish) Ferli Septi Irwansyah; Alfi Ikhlasul Amal; Eko Prabowo Hadisantoso; Atiek Rostika Noviyanti; Diana Rakhmawaty Eddy; Azman Bin Ma'Amor; Risdiana Risdiana
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 10, No 1 (2023): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v10i1.25262

Hydroxyapatite (HA) was successfully synthesized using the hydrothermal method. This study aimed to analyze the effect of a low solid/liquid ratio on the properties of HA crystals. HA synthesis was performed using chicken eggshells and the hydrothermal method at a temperature of 150°C. The solvent amount was kept constant, while the solid amount varied (half-reaction). The characteristics of HA were determined using XRD, FTIR, PSA, and SEM. The results showed that the purity and size of HA were influenced by a low solid/liquid ratio, while the crystallinity remained relatively unchanged, directly impacting the lattice parameter value. FTIR analysis revealed the absence of the O-H group in the sample with the low solid/liquid ratio. PSA results showed a smaller particle size of 0.995 µm for the sample with the low solid/liquid ratio. SEM results demonstrated a smaller particle size in the sample with a low solid/liquid ratio when observed at the same magnification

How to Read and Determine the Specific Surface Area of Inorganic Materials using the Brunauer-Emmett-Teller (BET) Method Irwansyah, Ferli Septi; Amal, Alfi Ikhlasul; Diyanthi, Erlinda Widyasmara; Hadisantoso, Eko Prabowo; Noviyanti, Atiek Rostika; Eddy, Diana Rakhmawaty; Risdiana, Risdiana
ASEAN Journal of Science and Engineering Vol 4, No 1 (2024): AJSE: March 2024
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ajse.v4i1.60748

The specific surface area of inorganic materials is a crucial parameter that influences their performance in various applications. The Brunauer-Emmett-Teller (BET) method is widely used for accurately determining the surface area of porous materials. This study presents a comprehensive guide to determining the specific surface area of inorganic materials using the BET method. The paper outlines the theoretical background of the BET method, the experimental procedures involved, and the data analysis techniques. Additionally, we discuss the limitations and potential sources of errors in the BET method. The proposed guide aims to provide researchers and practitioners with a systematic approach to accurately measure the specific surface area of inorganic materials, enabling informed decision-making and enhancing material design and optimization processes.

Co-Authors Adhitya Pratama Agus Surya Mulyawan Ahlam Nauval Mahendra Akrajas Ali Umar Alfi Ikhlasul Amal Alfi Ikhlasul Amal Alfian Nur Firdaus Amal, Alfi Ikhlasul Annisa Luthfiah Atiek Rostika Noviyanti Ayu Wanda Marita Azhari Yusuf Azman Bin Ma'Amor Azmi Prasasti Bimasakti Dea Fauziah Fitri Dini Janati Diyanthi, Erlinda Widyasmara Eko Prabowo Hadisantoso, Eko Prabowo Eneng Maryani Euis Julaeha Fadhilah, Riana Adisti Fajar Firmansyah Ferli Septi Irwansyah Ferry Arifiadi Firdaus, Muhammad Lutfi Firmansyah, Fajar Gani Abdilah Haryono Haryono Haryono Haryono Hasna Rofifah Novianti Herwinta, Syifa Rahmalia Ida Usman Idamayanti, Dewi Imam Supardi Iman Rahayu Iwan Hastiawan Iwan Hastiawan Iwan Hastiawan Jakariya Nugraha Juliandri Juliandri Khairani, Raisya Fakhira Kiagus Ahmad Mirza Azuri L Ahmad Na’ani L. Ahmad Na’ani La Aba Laelaturrohmah Laelaturrohmah Luthfia Pratiwi M. Diki Permana M. Lutfi Firdaus M. Lutfi Firdaus M. Lutfi Firdaus Mastuti Widi Lestari Mastuti Widi Lestari, Mastuti Widi Mohammad Rofik Usman Nila Sari Pandiangan Nuari, Sindhi Ika Nurqisthi, Faisha Pandu, Rinal Rahma, Aqilla Irfa Muthia Riana Adisti Fadhilah Rifky Adhia Pratama Rinal Pandu Risdiana Risdiana RISDIANA RISDIANA, RISDIANA Rukiah Rukiah Rustaman Rustaman Sahrul Hidayat Salma Nur Zakiyyah Sandra Puspita Sandra Puspita Sanidya Saraswati B Santhy Wyantuti Shariffuddin Bin Md Zain Solihudin Solihudin Solihudin Solihudin Soraya Nur Ishmah Sovia Islamiah Suryana Suryana Syamsiyatul Fajriyah Tatang Wahyudi Tatang Wahyudi Tatang Wahyudi Toto Subroto Yeni Wahyuni Hartati Yuni Nurhayati Yusi Deawati Zakiyyah, Salma Nur

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