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All Journal VALENSI Jurnal Pendidikan dan Pengajaran IPTEK The Journal for Technology and Science Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal IPTEK Bagi Masyarakat Journal of The Indonesian Society of Integrated Chemistry al Kimiya : Jurnal Ilmu Kimia dan Terapan
Rahmi Rahmi
Departement Chemistry, MIPA, Faculty Of Sains And Technology, Universitas Jambi
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences

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Synthesis and Characterization of Nano-sized Carbonated Calcium Hydroxyapatite (CHAp) from Rebon shrimp (Acetes erythraeus) as a Candidate for Dental Restoring Application Ngatijo Ngatijo; Restina Bemis; Heriyanti Heriyanti; Rahmi Rahmi; Nashih Ulwan; Rahmat Basuki
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 7, No. 2, November 2021
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v7i2.21359

Abstract

Carbonated calcium hydroxyapatite (CHAp) exhibits excellent biocompatibility with bone and teeth, making it an ideal candidate for orthopedic and dental application. However, the study of CHAp synthesis from natural material is still scarce. The purpose of this research is to synthesize and characterize of CHAp, using Rebon shrimp (Acetes erythraeus) as a calcium source. The synthesis was conducted by hydrothermal method with the variation of Ca/P ratios 1.61; 1.67; 1.73. The as-prepared CHAp was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy-energy dispersive X-ray (SEM-EDX). The FT-IR results show that synthesized material exhibited characteristic CHAp band of hydroxide at 3448 and 1635 cm-1, carbonate at 872 and 1427 cm-1, and phosphate at 1049; 606; and 570 cm-1. The diffractogram pattern assigned the all observed peak of CHAp are in good agreement compared to CHAp database with the nano-scale size. It also observed that the high Ca/P ratio will decrease the crystallinity of CHAp. The as-prepared CHAp micrograph is agglomerates spherical form with size between 5-20 nm which build up from 18–26 nm crystallite particles. The result of this research confirmed that Rebon shrimp is the promising materials for calcium source in CHAp production.
Attitudes and Self-Efficacy: Perspectives on Science Subjects for Junior High School Students M Dwi Wiwik Ernawati; Asrial Asrial; Dwi Agus Kurniawan; Wahyu Adi Pratama; Rahmat Perdana; Rahmi Rahmi
Jurnal Pendidikan dan Pengajaran Vol 54 No 3 (2021): October
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (268.702 KB) | DOI: 10.23887/jpp.v54i3.36416

Abstract

Physics is one of the subjects considered heavy and avoided by some students, which is very challenging, frustrating, perseverance, perseverance, thoroughness and lots of practice so that in reality, not many students like physics. This study aims to determine the differences and the relationship between students' attitudes and self-efficacy in learning science. This type of research is quantitative with a comparative type. The number of respondents used as a sample is 74 students. The data collection technique used simple random sampling. The study results using the T-test showed significant differences in students' attitudes and self-efficacy in science lessons, both female and male students in grade 8A and grade 8B. The correlation test results between students' attitudes and self-efficacy towards science subjects in grade 8A showed that the second variable (attitude and self-efficacy) was related. Moreover, the correlation test results in class 8B showed that the two variables (attitude and self-efficacy) were related. The urgency of this research is that teachers can find out the differences in attitudes and self-efficacy between male and female students. Compared to previous research, the novelty of this study is to use Attitude and self-efficacy variables, with different indicators from previous studies.
Gender Analysis in terms of Attitudes and Self-Efficacy of Science Subjects for Junior High School Students M. Dwi Wiwik Ernawati; Asrial Asrial; Dwi Agus Kurniawan; Ahmad Mansur Nawahdani; Rahmat Perdana; Rahmi Rahmi
Jurnal Penelitian Pendidikan IPA Vol. 7 No. SpecialIssue (2021): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v7iSpecialIssue.828

Abstract

The purpose of this study was to determine the comparison of students' attitudes and self-efficacy based on gender, and to determine the relationship between students' attitudes and self-efficacy towards science subjects. This research uses quantitative research with survey method. The sample in this study was 74 students from SMPN 1 Muaro Jambi in Muaro Jambi district. The sampling technique used is purposive sampling. There are two instruments in this study, namely attitudes towards science and self-efficacy. The results of the T-test of student attitudes towards science subjects obtained were sig. (2-tailed) < 0.05, so there were differences in student attitudes towards science subjects, both female and male students in class VIII A and class VIII B. The results of the T-test of students' self-efficacy on science subjects obtained a value of sig.(2-tailed) < 0.05, so there are differences in student self-efficacy on science subjects, both female students and male students in class VIII A and class VIII B. While the results of the correlation test between attitudes and students' self-efficacy towards science subjects class VIII A and VIII B showed a value of sig. (2-tailed) < 0.05, then there was a relationship between students' attitudes and self-efficacy towards subjects’ science lessons, both female students and male students in class VIII A and class VIII B.
Interest and Science Process Skills in Science Education Based on Gender Retni Sulistiyoning Budiarti; Dwi Agus Kurniawan; Rahmat Perdana; Sabila Eka Septi; Rahmi Rahmi
Jurnal Pendidikan dan Pengajaran Vol 55 No 1 (2022): April
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (399.63 KB) | DOI: 10.23887/jpp.v55i1.37738

Abstract

The importance of students' interest in learning is learning skills, so research is carried out to assess students' interests and skills in depth based on grade level and gender in a school so that interests and skills can be known in depth based on the indicators tested. There has been no research that examines student interest and science process skills in detail based on grade level and generation in a school. So the autor make this study with purpose to analyze how the interest and science process skills between women and men compare in science subjects and to analyze how the relationship between students' interests and science process skills with science subjects. This study uses a quantitative method with a comparative type. Quantitative research is a field of inquiry that stands alone, is scientific in nature and aims to understand social reality. The instrument in this study used a questionnaire and an observation sheet, namely a student interest questionnaire and an observation sheet for science process skills. Based on the results of hypothesis testing, research testing and data analysis, the conclusion of this study is from the T-test there are differences in the interests of female students and male students in class VII A and VII B. From the results of the T test for students' science process skills there are differences in the interests of female students and male students in grades VII A and VII B. Based on the results of the correlation test between interests and science process skills of grade VII A students there is a relationship between interests and science process skills between female and male students as well as in class VII B. Students' interest and science process skills have a significant influence on curiosity, learning materials and teacher attitudes, student observation and communication.
Pengaruh Variasi Konsentrasi Alumina Pada Sintesis Nanokomposit Hidroksiapatit/ Alumina dari Udang Papai Menggunakan Metode Hidrotermal Restina Bemis; Heriyanti Heriyanti; Rahmi Rahmi; Ratih Dyah Puspitasari; Datia Imawati
Journal of The Indonesian Society of Integrated Chemistry Vol. 15 No. 1 (2023): Journal of The Indonesian Society of Integrated Chemistry
Publisher : Pendidikan Kimia FKIP Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jisic.v15i1.21309

Abstract

Tujuan penelitian untuk mensintesis nanokomposit dan mengkarakterisasi hidroksiapatit dari udang papai dan dikomposit untuk meningkatkan sifat mekanik tanpa mengubah biokompatibilitasnya. Komposit hidroksiapatit menggunakan bahan lain seperti alumina disintesis menggunakan metode hidrotermal dengan variasi konsentrasi 0,025; 0,05 dan 0,075 juta. Komposit HA/Al2O3 dikarakterisasi dengan FTIR, SEM, dan XRD. Hasil FTIR menunjukkan bilangan gelombang. HA/Al2O3 yang disintesis menunjukkan pita O-H yang khas pada kisaran bilangan gelombang 2361-3460cm-1. CO32- pada rentang bilangan gelombang 1380-1500 cm-1. Al-O pada rentang bilangan gelombang 901cm-1 menunjukkan bahwa HA telah didoping dengan Al2O3. PO43- pada bilangan gelombang 605;873 dan 1041 cm-1. Pola difraktogram menentukan bahwa semua puncak HA/Al2O3 yang diamati berada pada daerah 2theta 10-70° menurut database referensi dan derajat kristalinitas meningkat dengan konsentrasi tinggi alumina yang digunakan. Morfologi doping HA/Al2O3 berupa aglomerasi karena pada proses sintesis menggunakan metode hidrotermal tidak ada pengadukan sehingga bahan kurang homogen, analisis SEM menggunakan software origin dan image j menunjukkan presentase porositas lebih kecil sehingga memenuhi persyaratan untuk digunakan sebagai implan dan memberikan nilai ukuran semakin kecil dalam skala nano, yakni pada rentang 5-14,5 nm.
The Effect of Variations of Hydrothermal Temperatures on Ex-Situ Hydroxyapatite/Al2O3 Doping Process from Papai Shrimp (Acetes erythraeus) Restina Bemis; Ratih Dyah Puspitasari; Heriyanti Heriyanti; Rahmi Rahmi; Gessy Tri Priyanti
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 9, No 2 (2022): 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.v9i2.20520

Abstract

Hydroxyapatite (HA) is an alloplastic material that is commonly used as a substitute for bone grafts or bone grafts because it has bioactive properties, namely osteoconduction. This study aims to improve or develop the function of hydroxyapatite to become a strong and resilient biological device that can withstand loads for appropriate functions such as bone implants. Therefore, it is necessary to modify the structure, among others, by the reinforcement process (composite formation) with other materials.The doping of hydroxyapatite/Al2O3 in this study was carried out using the hydrothermal method. The hydrothermal method is one of the hydroxyapatite synthesis methods carried out at high pressure and temperature to achieve equilibrium. The material used in this study was papai shrimp as a source of calcium. The temperature has an effect in this study where the higher the doping temperature used, the higher the degree of crystallinity, particle size homogeneity, and porosity value. From the doping results, it is known that a temperature of 300°C produces a degree of crystallinity of 54.32% and a crystal size of 3.75 nm with a porosity value of 99.38%. This result is much better than the undoped hydroxyapatite in the previous study.
Catalytic Cracking of Polypropylene-Low Density Polyethylene Pyrolysis Oil over Hierarchical H-ZSM-5 Catalyst Dwi Cahyani, Silvia; Marlinda, Lenny; Evrianti, Yuli; Rimawan, Bagas; Heriyanti, Heriyanti; Rahmi, Rahmi; Sutrisno, Sutrisno
IPTEK The Journal for Technology and Science Vol 35, No 3 (2024)
Publisher : IPTEK, DRPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v35i3.19188

Abstract

The conversion of plastic waste into liquid fuel has become the center of attention by researchers as a way to overcome environmental problems. According to last research, the polypropylene (PP) and low-density polyethylene (LDPE) pyrolysis oil mixture was classified into hydrocarbon range diesel which have the number of carbon atom from C12-C24. Because that, the effect of LDPE/PP pyrolysis oil over hierarchical H-ZSM-5 catalyst on hydrocarbon composition of liquid fuel oil using the catalytic cracking reactor at 200 oC was investigated. Hierarchical H-ZSM-5 catalyst (hH-ZSM-5) was obtained from H-ZSM-5 modified by desilication method using NaOH. Gas chromatography-mass spectrometry showed that the liquid fuel oil from the catalytic cracking of all variations consisted of aliphatic hydrocarbons with some cycloaliphatic compounds. In ratio of 250 mL/0.5 g (oil/catalyst) aromatic hydrocarbon increased from 1.69 area% to 15.58 area% over H-ZSM5 and hH-ZSM-5 respectively. The higher oil quality with shorter hydrocarbon chains in all variations was obtained over hH-ZSM-5 catalyst, namely in the range of C7-C14 or comparable to hydrocarbon range gasoline and kerosene.
Pengolahan Limbah Plastik Menggunakan Reaktor Pirolisis di Bank Sampah Dream Central, Desa Wijaya Pura, Kecamatan Jambi Selatan, Kota Jambi Lenny Marlinda; Rahmi Rahmi; Diah Riski Gusti; Intan Lestari; Wahyudi Zahar; Aditya Denny Prabawa; Yuli Evrianti Br Rajagukguk; Ermita Meisa Manulang; Ladiva Adinda; Rif’at Syauqi
Jurnal IPTEK Bagi Masyarakat Vol 5 No 1 (2025)
Publisher : Ali Institute of Research and Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55537/j-ibm.v5i1.1178

Abstract

The COVID-19 pandemic has increased online shopping and food delivery, causing a surge in single-use plastic waste and has become a habit to this day along with the rapid development of digital technology. Dream Central Waste Bank (BSI Dream) in Wijaya Pura Village collects 3 tons of waste monthly but lacked advanced plastic processing technology. This community service initiative aimed to implement a pyrolysis reactor to convert plastic waste into fuel oil and paving blocks, thereby enhancing economic value while promoting environmental sustainability. The activity stages included partner coordination and surveys, reactor performance upgrades, operational training, and evaluation. This activity involved five partners representing the Wijaya Pura Village community.  The reactor successfully produced fuel oil (density: 0.848–0.912 g/mL) and residues suitable for paving block production. The outcome of this initiative demonstrated improved skills among partners, the creation of marketable products and increased community income opportunities. Furthermore, the activity fostered greater awareness of the importance of sustainable waste management and supported the application of circular economy principles.
Co-Authors Ahmad Mansur Nawahdani Asrial Datia Imawati Denny Prabawa, Aditya Diah Riski Gusti Dwi Agus Kurniawan Dwi Cahyani, Silvia Ermita Meisa Manulang Evrianti, Yuli Gessy Tri Priyanti Heriyanti Heriyanti Intan Lestari Ladiva Adinda Lenny Marlinda M. Dwi Wiwik Ernawati Margaret Dwi Wiwik Ernawati Nashih Ulwan Ngatijo Ngatijo Rahmat Basuki Rahmat Perdana Ratih Dyah Puspitasari Restina Bemis Restina Bemis Retni Sulistiyoning Budiarti Rif’at Syauqi Rimawan, Bagas Sabila Eka Septi Sutrisno Wahyu Adi Pratama Wahyudi Zahar Yuli Evrianti Br Rajagukguk