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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Riset Kimia Jurnal Zarah Jurnal Penelitian Pendidikan IPA (JPPIPA) Al-Kimia ALCHEMY Jurnal Penelitian Kimia JURNAL PENDIDIKAN TAMBUSAI Jurnal Ilmiah Pendidikan Scholastic Global Conference Index Pelita Eksakta Acta Chimica Asiana Indonesian Journal of Chemical Science and Technology CHEDS: Journal of Chemistry, Education, and Science Jurnal Pijar MIPA Tsaqofah: Jurnal Penelitian Guru Indonesia MASALIQ: Jurnal Pendidikan dan Sains International Journal of Innovation in Mechanical Engineering and Advanced Materials Ta'dib Jurnal Pendidikan MIPA
Budhi Oktavia
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Religion Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Other

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PENENTUAN KONDISI OPTIMUM DESORPSI KATION Cd2+ DARI ADSORBEN SILIKA GEL-GPTMS TERMODIFIKASI SULFONAT Afifi, Rayhanil; Oktavia, Budhi; Kurniawati, Desy; Putra, Ananda
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 2 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i2.9592

Abstract

Silica gel mengandung situs aktif berupa gugus silanol (Si-OH) dan siloksan (Si-O-Si), sehingga berguna untuk proses adsorpsi ion logam. Pada penelitian ini silika GPTMS termodifikasi sulfonat digunakan sebagai adsorben kation kadmium. Proses desorpsi dilakukan untuk menghilangkan kation kadmium dari adsorben Silika GPTMS Sulfonat, sehingga adsorben dapat digunakan kembali. Tujuan dari penelitian ini adalah untuk mengetahui kondisi optimal desorpsi ion Cd2+dengan memvariasikan jenis bahan penyerap, konsentrasi, dan laju alir. Hasil penelitian menunjukkan berat adsorpsi sebesar 0,1853 mg dengan persentase 96,81%. Pada proses desorpsi eluen desorpsi terbaik untuk pelepasan Cd2+ adalah CaCl2 0,025M, dengan persentase desorpsi sebesar 96,49% dengan berat terdesorpsi sebesar 0,1787 mg Cd2+. Pada konsentrasi CaCl2 yang divariasikan, kondisi optimum diperoleh pada konsentrasi 0,05 M dengan persentase desorpsi 100% dan berat terdesorpsi sebesar 0,1793 mg Cd2+. Sedangkan pada laju alir, kondisi optimum diperoleh pada 1 mL/menit dengan persentase desorpsi 100%.
Optimasi Desorpsi Kation Pb2+ dari Adsorben Silika Gel-GPTMS (Glycidoxypropyltrimethoxysilane) Termodifikasi Sulfonat dengan Metode Kolom Auzakiyah, Sabella; Oktavia, Budhi; Sanjaya, Hary; Nizar, Umar Kalmar
Periodic Vol 14, No 2 (2025): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v14i2.133061

Abstract

Silica gel is a material that has two active sides, namely silanol (Si-OH) and siloxane (Si-O-Si) groups, but it is less effective as an adsorbent so it needs to be modified. Modification was carried out by adding sulfonate groups using GPTMS bridging compounds to improve the ability of silica gel to adsorb metal ions, such as Pb²⁺ cations. Characterization was performed using FTIR (Fourier Transform-Infrared) and XRF (X-Ray Fluorescence) to ensure the success of the modification process, while SSA (Atomic Absorption Spectrophotometry) was used to measure the effectiveness of the adsorption and desorption processes. In this study, adsorption and desorption were carried out using the column method. Adsorption of Pb²⁺ cation was carried out using silica gel-GPTMS sulfonate adsorbent at optimum conditions of 20 ppm concentration and pH 3. The process was followed by desorption to determine the optimum conditions, including the type of desorption agent (NaCl and CaCl₂), concentration, and flow rate. The results showed that the optimum conditions were obtained with CaCl₂ desorption agent, with a desorbed weight of 0.1707 mg and a desorption efficiency of 98.67%. The optimum concentration of CaCl₂ was 0.05 M with a desorbed weight of 0.1730 mg and a desorption efficiency of 100%. In addition, the optimum flow rate was 1 mL/min with a desorption percentage of 100%.
Development of Guided Discovery Based Stoichiometry E-Modules to Improve Students' Science Literacy Harnas, Dolla Mulyana; Oktavia, Budhi; Azhar, Minda; Dewata, Indang; Pikoli, Masrid
Jurnal Pendidikan MIPA Vol 23, No 3 (2022): Jurnal Pendidikan MIPA
Publisher : FKIP Universitas Lampung

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

Abstract

This research aims to create e-modules based on guided discovery learning that are effective, practical, and support student learning. The research type uses research and development (R&D) using a 4-D model with four steps: definition, design, development, and dissemination. This tool is in the form of a questionnaire on effectiveness and feasibility. Elastic modulus is verified by her 6 validators. Data were analyzed according to the Aikens V formula and percent utility. In the analysis of content validity and technical rating, the average V of Aikens with high valid categories was 0.85 and 0.83. Teacher and student ratings of the practicality questionnaire data were 82% and 83% in the highly practical category. Data analysis shows that young's modulus has high validity and practicality. Therefore, it can be concluded that e-modules based on guided discovery learning are effective, practical, and categorized as teaching materials that improve students' scientific literacy.Keywords: e-module, stoichiometry, guided discovery learning, science literacy.
UJI KONDISI OPTIMUM DESORPSI ANION FOSFAT (PO43-) DENGAN SILIKA GEL TERMODIFIKASI DIMETILAMINA Yunisya, Dinda; Oktavia, Budhi
CHEDS: Journal of Chemistry, Education, and Science Vol 6, No 2 (2022)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v6i2.6073

Abstract

Salah satu metode untuk memisahkan anion fosfat adalah adsorpsi. Adsorben yang memiliki banyak minat adalah silika gel. Silika gel telah berhasil dimodifikasi menggunakan dimetilamina sehingga menghasilkan gugus aktif amina yang dapat mengikat anion fosfat. Gugus aktif yang dihasilkan tersebut  mampu digunakan sebagai pemisah atau penukar ion. Untuk mengetahui kemampuan dari silika gel termodifikasi dimetilamina tersebut, maka dapat dilakukan desorpsi dengan metoda kolom. Dalam proses desorpsi, eluen yang digunakan yaitu HCl dan H2SO4. Tujuan penelitian ini adalah menentukan jenis eluen dan konsentrasi optimum eluen dalam mendesorpsi anion fosfat dari silika gel termodifikasi DMA. Berdasarkan hasil penelitian jenis eluen yang didapatkan dari hasil desorpsi anion fosfat adalah H2SO4. Konsentrasi H2SO4 di variasikan yaitu 0,03 M, 0,05 M, 0,1 M, 0,15 M, 0,2 M, 0,25 M dan 0,3 M. Konsentrasi optimum asam sulfat yang didapatkan adalah 0,2 M dengan jumlah terdesorpsi 0,021049 mg yang memiliki persen desorpsi 81,51%.
KONDISI OPTIMUM DESORPSI ANION NITRIT DARI SILIKA GEL TERMODIFIKASI DIMETILAMINA MENGGUNAKAN HCL DAN H2SO4 Maulana, Febrina; Oktavia, Budhi
CHEDS: Journal of Chemistry, Education, and Science Vol 6, No 2 (2022)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v6i2.6074

Abstract

Silika merupakan senyawa terbanyak penyusun kerak bumi. Silika banyak dimanfaatkan sebagai adsorben, prekonsentrasi atau pemisahan analit. Modifikasi silika dengan dimetilamina mampu meningkatkan kapasitas adsorpsi. Pada penelitian ini, dilakukan adsorpsi dan desorpsi anion nitrit pada silika termodifikasi dimetilamina (DMA) menggunakan metode kolom. Setelah anion nitrit diadsorpsi dilanjutkan dengan proses desorpsi yang bertujuan untuk mengetahui kondisi optimum desorpsi anion nitrit dari silika gel termodifikasi DMA menggunakan eluen asam (HCl dan H2SO4). Berdasarkan hasil penelitian didapatkan kapasitas adsorpsi pada silika sebesar 0,00908 mg/gr, berat anion nitrit yang terserap 0,00454 mg dengan persentase penyerapan sebesar 47,27%. Persentase desorpsi anion nitrit menggunakan HCl sebesar 78,32% dengan melepaskan anion nitrit sebanyak 0,003528 mg. Sedangkan persentase desorpsi anion nitrit menggunakan H2SO4 sebesar 50,30% dengan melepaskan anion nitrit sebanyak 0,002274 mg. Konsentrasi optimum HCl yaitu 0,05M, dapat melepaskan anion nitrit sebanyak 0,00425 mg dengan persentase desorpsi sebesar 92,45%.
DESORPSI NITRAT (NO3-) DARI SILIKA GEL TERMODIFIKASI DIMETILAMINA (DMA) MENGGUNAKAN ELUEN ASAM Yanti, Desvila Ramadha; Oktavia, Budhi
CHEDS: Journal of Chemistry, Education, and Science Vol 6, No 2 (2022)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v6i2.6072

Abstract

Desorpsi merupakan proses terlepasnya baik ion ataupun molekul yang menempel atau terserap pada adsorben. Proses ini dimanfaatkan dalam regenerasi suatu adsorben agar adsorben dapat digunakan kembali saat sudah jenuh.  Pada penelitian ini, desorpsi dilakukan terhadap anion nitrat yang telah terserap pada adsorben berupa silika gel yang termodifikasi DMA menggunakan metode kolom. Tujuan dilakukan penelitian ialah untuk melihat eluen mana yang memberikan persen desorppsi lebih tinggi antara H3PO4 0,03 M dan H2SO4 0,03 M, lalu eluen dengan persen desorpsi lebih tinggi ini ditentukan konsentrasi optimumnya dalam mendesorpsi. Berdasarkan eluen yang diuji, H2SO4 memiliki persen desorpsi yang lebih tinggi yaitu 66,22%, sedangkan H3PO4 62,41%. Pada variasi konsentrasi H2SO4 didapatkan kondisi optimum pada 0,10 M dengan persen desorpsi 80,89% atau melepaskan 0,0684 mg NO3- dari 0,0851 mg yang terserap pada silika gel termodifikasi DMA.
Effect Type of Desorption Eluent and Concentration in Desorption of Zn2+ Cation from Sulfonate Modified Silica Gel-GPTMS (Glycydoxypropyltrimethoxysilane) Adsorbent Hafis, Muhamad; Oktavia, Budhi; Alizar, Alizar; Warda Ningsih, Sherly Kasuma
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 7 No. 2 (2024): JULY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i2.62256

Abstract

Silica has silanol groups contained in it which have low binding ability because it has low acidity, resulting in low absorption effectiveness on silica. In order to improve the properties and to expand the field of utilization, a modification process is carried out on silica gel using GPTMS bridging compounds and sulfonate salts as modifiers. The study explains that CaCl2.2H2O with a desorption percent of 97.25% has a greater ability than NaCl which is only 83.93% in the desorption of Zn2+ cations. The study also explains that the optimum concentration of CaCl2.2H2O eluent in the desorption of Zn2+ cations is at 1mmol/L where the desorption yield is 93.74%.
Development of an Acid–Base Module Based on Problem-Based Learning Integrated with TPACK to Improve Senior High School Students’ Learning Outcomes Rela Faradina; Desy Kurniawati; Budhi Oktavia; Alizar
Jurnal Penelitian Pendidikan IPA Vol 11 No 9 (2025): September
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i9.12535

Abstract

The Merdeka Curriculum emphasizes students’ ability to understand and apply their conceptual knowledge to solve contextual problems. This study aims to determine the validity, practicality, and effectiveness of an acid–base module based on problem-based learning integrated with TPACK in improving the learning outcomes of Phase F senior high school (SMA/MA) students. The development model used in this research was the 4-D model. The acid–base module was validated by three chemistry lecturers and two chemistry teachers. The practicality test of the module was conducted by three chemistry teachers and 31 students. The effectiveness of the module in improving learning outcomes was analyzed using the N-gain test. The validity test was analyzed using Aiken’s V, which consisted of content and construct validity, yielding results of 0.89 and 0.91, respectively, both categorized as valid. The practicality results from teachers and students were 98.61% and 86.87%, respectively, both in the high category. The N-gain analysis resulted in a value of g = 0.79, categorized as high. Based on the hypothesis test, the calculated t-value was greater than the critical t-value. These findings confirm that the developed acid–base module based on problem-based learning integrated with TPACK is valid, practical, and effective for significantly enhancing students’ learning outcomes.
Development of a Cr(VI) metal ion detection sensor using a modified pencil lead electrode (PLE) with a silver thin layer using the voltammetry method Nella Aulia Putri; Trisna Kumala Sari; Budhi Oktavia; Sherly Kasuma Warda Ningsih
Acta Chimica Asiana Vol. 9 No. 1 (2026)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v9i1.251

Abstract

Chromium(VI) metal ions have harmful effects on the environment and organisms. Chromium(VI) particles can cause chromosomal abnormalities, cross-linking, disruption of the cell cycle, and DNA damage within cells. Therefore, due to its high toxicity, it is crucial to monitor the concentration of chromium(VI) metal ions in the environment. This study aims to detect Cr(VI) metal ions in a simple, rapid, and effective manner. Electrochemical methods are employed to investigate the performance of PLE and Ag/PLE electrodes and to determine the optimal conditions for electrodeposition cycles and supporting electrolyte concentrations in detecting Cr(VI) metal ions. The electrochemical method is based on the specific reaction of the analyte, which generates an electrical signal. The PLE surface is modified with a silver thin layer through electrodeposition using cyclic voltammetry. The silver thin layer used for electrode modification offers several advantages, including improved electron transport and enhanced electrocatalytic response. The results indicate that the performance of Ag/PLE is superior to that of PLE in detecting Cr(VI) metal ions under optimal supporting electrolyte conditions, specifically 0.1 M HNO₃ with one electrodeposition cycle. Calibration curve analysis for Cr(VI) ions yielded the regression equation y = 0.6688x + 0.0085, with a correlation coefficient (R²) of 0.9958 and a limit of detection (LOD) of 0.18 mM.
Development of Problem-Based Learning Student Worksheet Integrated with Ethnoscience on Acid-Base Material Emmilya Febri Marthin; Hardeli; Budhi Oktavia; Desy Kurniawati
Jurnal Penelitian Pendidikan IPA Vol 10 No 7 (2024): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i7.7930

Abstract

This study aims to develop problem-based learning student worksheets integrated with ethnoscience on acid-base materials that are valid and practical. This research uses a development research method (Research and Development) with a 4-D model. The data of this study were collected through validity sheets completed by 4 validators, namely 2 chemistry lecturers and 2 chemistry teachers, and with a practicality questionnaire sheet completed by 2 chemistry teachers and by 35 students of SMAN 1 Batusangkar as respondents. Data were analyzed using quantitative descriptive method, using Aiken’s V. The result for content validity is 0.88 and construct validity is 0.90 with valid category. The result for teachers practicality is 0.95 and students practicality is 0.82 with practical category. Based on the results of the research that has been conducted, it can be concluded that the development of problem-based learning-based student worksheets integrated with ethnoscience on acid-base material is valid and practical.
Co-Authors Afifi, Rayhanil Afrilia, Yoni Ahmad Fauzi Ali Amran Alizar Alizar, Alizar Ananda Putra Andreas Difa Andromeda Anggraini Mardhatillah, Leonyta Anisa Nahari Auzakiyah, Sabella Ayu Azizah Bahrizal Bahrizal Berlian, Syakhinah Burma, Resna Chindikia, Ilmy Deasy Liestianty Delfitri Delfitri Deni Marlina Desy Kurniawati DESY KURNIAWATI Desy Kurniawati Deva Indriyani Devita Efri Dewi Kristina Dipnorita Retno Dwi Putri, Vika Trisna DWI RAMADHANI Dzakma Putri Alsa Edi Nasra Elvina Elvina Elvina Yulistia Erwan Emmilya Febri Marthin Fadhilatu Zikra Fahilatul Syukro Fajriah Azra Firmansyah Khairul Kamal Fitrah Mey Harmi Siregar Fitri Amelia Fitriningsih, Annisa Gemasih, M.Iqbal Saputra Guspatni Guspatni Habibur Rahman Dafnaz Hafis, Muhamad Hainunnisa Syafitriza Hanna Salwa Putri Hardeli Hardeli Hardeli Hardeli Hardeli Harmaiyani, Risky Harnas, Dolla Mulyana Hary Sanjaya Hary Sanjaya Hellena Ditasya Hesty Parbuntari Ibrahim Rahmat Illa Ramadhani Indang Dewata Isra Hayati Kauri, Desrike Khairani - Khairani - Latisma Latisma Lubis, Amalia Putri Ma’a, Yustini Masrid Pikoli Maulana, Febrina Mawardi Meri Novia Nurman Miftahul Khair Miftahul Khair Miftahurrahmi, Miftahurrahmi Minda Azhar Muhammad Amin Muhammad Farhan Mulia, Melindra Mutiara Oksyarni Nabilla Nadia Nahdiah Amin Nella Aulia Putri Nilu Gussarsi Nizar, Umar Kalmar Nofri Yuhelman Nur Hafni Hasibuan Nuzulia Rahma Yona Parbuntari, Hesty Patricia Helena Pebriani Pebriani Pernadi, Niza Lian Putra, Ananda Putri Fatimah Putri, Reza Athia Putri, Yunisa Anugrah Putwi Ayu Faradila Rahadian Zainul Rahardian Z Rahmi, Fathaniah Raviqa Randy Lesmana Putra Rela Faradina Reviana Ervita Riga Riga, Riga Rini Anggraini Rita Sundari Riva Silvia Romy Dwipa Yamesa Away Sabay Agustiya Sabrina, Joya Sari, Trisna Kumala Septya Anggraini Setiowati, Fiqih Sekar Sherly Kasuma Warda Ningsih Sherly Kasuma Warda Ningsih Sintha Hafizhah Yonel Siska Maharani Sri Benti Etika Sri Benti Etika Sri Teguh Priharti Sundari, Rita Suryelita . Syamsi Aini Syifa Rahma Ayunda Takdib, Manajer Jurnal Tarmizi Tarmizi Tarmizi Tarmizi Trihanto Setiadi Trisna Kumala Sari Ulianas, Alizar Umar Kalmar Nizar Umar Kalmar Nizar Usman Bakar Visca Alisia Arianti Vitratul Wirza Vivi Chaniasi Warni Arfin Wira Ayuriza Yani Puspita Yani Yanti, Desvila Ramadha Yerimadesi yuda pratama Yulia Mona Liza Yunisya, Dinda Yustini Ma’a Zulmariko