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All Journal Reaktor International Journal of Renewable Energy Development JURNAL KIMIA SAINS DAN APLIKASI Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Indonesian Journal of Mathematics and Natural Sciences Jurnal Inovasi Pendidikan Kimia Sainteknol : Jurnal Sains dan Teknologi Jurnal Zeolit Indonesia Phenomenon : Jurnal Pendidikan MIPA Chemistry in Education Indonesian Journal of Chemical Science Indonesian Journal of Physics and Nuclear Applications Jurnal Penelitian Pendidikan IPA (JPPIPA) ALCHEMY Jurnal Penelitian Kimia IQRO: Journal of Islamic Education Journal of Innovative Science Education International Journal of Active Learning Jurnal Litbang Provinsi Jawa Tengah
- Jumaeri
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences

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SIFAT MAGNETIK MATERIAL LA0,6BA0,4MNO3 DARI LAMNO3 DAN BAMNO3 MENGGUNAKAN METODE KOMBINASI SOL-GEL DAN SOLID STATE Kurniawan, Budhy; Saadah, Nelis; Jumaeri, Jumaeri; Putri, Witha Berlian; Munazat, Dicky
Indonesian Journal of Chemical Science Vol 9 No 1 (2020)
Publisher : Universitas Negeri Semarang

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Abstract

Perovskite manganite is a manganese oxide-based magnetic material with the basic structure of AMnO3. Interactions between structures and electron transport of materials are studied of the substitution at position A. Perovskite material has interesting physical properties, such as magnetoresistance and magnetocaloric. The goal of research is to study the magnetic properties La0,6Ba0,4MnO3 from single-phase LaMnO3 and BaMnO3 compounds by combination sol-gel and solid state methods. Synthesis of LaMnO3 and BaMnO3 compounds using gel sol methods. The synthesis of La0,6Ba0,4MnO3 using solid state method, that is by mixing LaMnO3 and BaMnO3 powder mechanically and sintering at 1000º C for 24 hours. The characterization magnetic properties of La0,6Ba0,4MnO3 using Vibrating Sample Magnetometer indicate that the material is paramagnetic classified as soft-magnetic.
DESAIN E-DIAGNOSTIC TEST UNTUK ANALISIS PEMAHAMAN KONSEP PADA MATERI REDOKS DAN TATA NAMA SENYAWA Kamila, Naila Faza; M.Si., Dr. Jumaeri
Phenomenon : Jurnal Pendidikan MIPA Vol 10, No 2 (2020): Jurnal Pendidikan MIPA
Publisher : Sains and Technology Faculty, Walisongo State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/phen.2020.10.2.4247

Abstract

Kesulitan belajar peserta didik dalam memahami konsep kimia perlu diidentifikasi dengan sebuah instrumen evaluasi yang tepat. Untuk itu penelitian ini bertujuan untuk mengetahui kelayakan dan keefektifan pengembangan instrumen e-diagnostic test berupa three tier multiple choice (TTMC) untuk menganalisis ketercapaian kompetensi dasar ranah kognitif dan pemahaman konsep. Instrumen tersebut terdiri dari tiga tingkat, pertama mengenai jawaban, kedua mengenai alasan, dan ketiga mengenai keyakinan. Penelitian ini merupakan penelitian pengembangan dengan metode Plomp yang meliputi beberapa fase yaitu fase investigasi awal, desain, realisasi, tes dan evaluasi, serta implementasi. Subjek penelitian ini adalah peserta didik kelas X SMA Islam Sultan Agung 1 Semarang. Hasil penelitian menunjukkan instrumen yang dikembangkan layak dengan hasil validasi isi oleh pakar dan validasi konstruk melalui uji skala kecil dan besar. Profil paham konsep tertinggi ditunjukkan oleh IKD-5 yaitu sebesar 61,02%. Profil miskonsepsi tertinggi ditunjukkan oleh IKD-4 yaitu sebesar 69,49%. Dan profil tidak paham konsep tertinggi ditunjukkan oleh IKD-3 yaitu sebesar 26,27%.  Hasil analisis profil pemahaman konsep secara keseluruhan pada materi redoks dan tata nama senyawa menunjukkan 37,85% peserta didik paham konsep, 43,84% peserta didik miskonsepsi, dan 18,30% peserta didik tidak paham konsep.
Design of Integrated Corrosion E-module Vocational Context to Improve Critical Thinking Skills of Class X Students in Vocational High School Wahyuni, Promes Sari; Haryani, Sri; Jumaeri, Jumaeri
International Journal of Active Learning Vol 5, No 2 (2020): October 2020
Publisher : International Journal of Active Learning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijal.v5i2.27782

Abstract

Chemistry subjects as the basis of expertise are not placed by the needs of vocational subjects in every skill competency in vocational high school. The need for chemical materials in vocational high school for each skill competency is not the same for different skill competencies. Therefore, a vocational context integrated e-module design is needed to support chemistry learning activities and students for independent learning. The quality of teaching materials is measured by validity criteria, effectiveness, and practicality if teaching materials are used in the learning process. The development model used in this research is the 4D model (define, design, development, and dissemination). The data analysis technique uses qualitative and quantitative tests. Product development validation was carried out by media expert validators and chemical material experts, while the trial was conducted by 36 students of class X TKJ 2. The results of the analysis from the validator stated that the quality of learning material was in a very good category with a mean of 3.70 of material experts and 3.68 of media experts. The effectiveness of the e-module is shown by the increase in critical thinking skills of students with the achievement of N-gain of 0.57 in the medium category and classical completeness by 86.12%. The response of students to the practicality of using the e-module shows a result of 77.78% which belongs to the very good category and 22.22% which belongs to the good category. Based on the results obtained, it can be concluded that the student's worksheet developed to meet the criteria of valid, effective, practical, and can improve critical thinking skills.
PENGEMBANGAN LEMBAR KERJA PRAKTIKUM INOVATIF PADA PEMBELAJARAN BERBASIS PROYEK UNTUK MENGUKUR KETERAMPILAN PROSES SAINS Amique, Iqnatu Nazila; Jumaeri, Jumaeri; Sumarni, Woro; Susilaningsih, Endang
Chemistry in Education Vol 9 No 2 (2020): Terbit bulan Oktober 2020
Publisher : Universitas Negeri Semarang

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Abstract

Pengembangan Lembar Kerja Praktikum Inovatif (LKPI) pada pembelajaran berbasis proyek untuk mengukur keterampilan proses sains peserta didik dilakukan untuk menghadirkan alternatif media untuk membantu pembelajaran. Penelitian bertujuan untuk menghasilkan LKPI yang teruji layak, efektif, dan praktis. Metode penelitian yang digunakan adalah Research and Developmnet (RnD) dengan model pengembangan Define, Design, Develop, dan Disseminate (4D). Subjek uji LKPI melibatkan 20 peserta didik kelas XI SMA untuk uji kecil dan 60 peserta didik kelas X SMA untuk uji besar. Uji kelayakan LKPI melibatkan 3 ahli menggunakan lembar validasi isi dan media. Hasil menunjukkan perolehan skor 86,7 dalam kategori sangat baik. Uji kecil menghasilkan nilai 44,9 dalam kategori sangat baik menggunakan lembar angket keterbacaan LKPI. Uji skala besar bertujuan untuk mengetahui keefektifan dan kepraktisan LKPI. Keefektifan LKPI diukur dengan hasil keterampilan proses sains dasar dengan lembar observasi yang menunjukkan hasil sangat baik dan keterampilan terintegrasi pada kategori baik menggunakan LKPI yang dikembangkan. Keefektifan lain diukur melalui uji pengetahuan dengan ketuntasan 68,3% dari hasil perhitungan N-gain sebesar 0,6782 pada kriteria sedang. Hasil uji kepraktisan LKPI sebesar 30,93 dalam kategori setuju. Simpulan yang diperoleh adalah LKPI telah teruji layak, efektif, dan paktis untuk mengukur keterampilan proses sains. LKPI dapat digunakan pada proses pembelajaran.
Peningkatan Kadar Etanol dalam Ciu dengan Metode Distilasi Adsorptif Menggunakan Zeolit Alam Rahayu, Anita; Sulistyaningsih, Triastuti; Jumaeri, Jumaeri
Indonesian Journal of Chemical Science Vol 9 No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i2.28727

Abstract

Abstrak Kebutuhan bahan bakar minyak di Indonesia, khususnya premium semakin meningkat, sedangkan ketersediaannya di alam semakin sedikit. Oleh karena itu, perlu dicari alternatif bahan bakar yang dapat diperbaharui, seperti Etanol. Etanol dengan kadar >96,5% v/v dapat digunakan sebagai campuran bahan bakar. Etanol dengan kadar >96,5% dapat dicapai dengan menggunakan metode distilasi adsorptif. Pada penelitian ini pemurnian etanol dilakukan menggukana dua cara yaitu distilasi sederhana dan distilasi adsorptif. Kadar awal sampel CIU A, CIU B dan CIU C berturut-turut adalah 9,92%, 44,60% dan 47,31% dengan menggunakan metode distilasi sederhana kadar etanol dapat meningkat menjadi 29,37%, 86,96% dan 90,81%. Meskipun metode distilasi sederhana dapat meningkatkan kadar etanol secara signifikan namun tidak dapat melampaui titik azeotropnya sehingga perlu adanya metode lain yaitu distilasi adsorptif dengan adsorben zeolit alam yang sudah teraktivasi. Dengan menggunakan metode distilasi adsorptif diperoleh kadar etanol tertinggi CIU A, CIU B dan CIU C berturut-turut sebesar 33,20%, 98,28% dan 99,22%. Kadar etanol tertinggi diperoleh saat pengambilan distilat ke-3 yaitu pada waktu 45 menit distilasi. Abstract The need for fuel oil in Indonesia, especially premium, is increasing, while its availability in nature is getting smaller. Therefore, it is necessary to look for alternative renewable fuels, such as Ethanol. Ethanol with a level of> 96.5% v / v can be used as a mixture of fuel. Ethanol with a concentration of> 96.5% can be achieved using the adsorptive distillation method. In this study, ethanol purification was carried out using two methods, simple distillation and adsorptive distillation. Initial levels of CIU A, CIU B and CIU C samples were 9.92%, 44.60% and 47.31% respectively using a simple distillation method. Ethanol levels could increase to 29.37%, 86.96% and 98.81%. Although a simple distillation method can significantly increase ethanol levels but cannot exceed its azeotropic point, it is necessary to have another method, namely adsorptive distillation with activated zeolite natural adsorbent. By using the adsorptive distillation method, the highest ethanol levels of CIU A, CIU B and CIU C were 33.20%, 98.28% and 99.22% respectively. The highest ethanol content was obtained when the third distillate was taken at 45 minutes distillation.
Sintesis Zeolit dari Kaolin sebagai Carrier Amoksisilin Wardani, Deta Sri; Mahatmanti, F. Widhi; Jumaeri, Jumaeri
Indonesian Journal of Chemical Science Vol 9 No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i2.28728

Abstract

Abstrak Pada penelitian ini dilakukan sintesis zeolit dari kaolin dan kemampuannya sebagai carrier amoksisilin. Proses sintesis zeolit diawali dengan kalsinasi kaolin menjadi metakaolin, kemudian ditambahkan larutan NaOH 3,0 M dan diaduk selama 2 jam. Proses pembentukan kristal zeolit menggunakan metode hidrotermal pada suhu 100ºC selama 8 jam. Zeolit hasil sintesis dikarakterisasi menggunakan instrumen FTIR, XRD, dan SAA. Zeolit sintetis digunakan sebagai carrier obat amoksisilin dengan parameter adsorpsi dan desorpsi. Hasil karakterisasi zeolit hasil sintesis dilihat dari gugus fungsi dan pola difraksi menunjukkan kemiripan dengan zeolit A. Diameter pori zeolit sintetis sebesar 7,44 Å dan luas permukaannya adalah 3,456 m2/g. Kondisi optimum zeolit hasil sintesis dalam mengadsorpsi amoksisilin terjadi pada pH 5 dan waktu kontak selama 75 menit, dan kapasitas adsorpsinya sebesar 5,356 mg/g atau 80,334%. Sedangkan untuk amoksisilin yang terlepas dari zeolit sebesar1,561 mg/g atau 29,144%. Abstract This research is to know the of zeolite synthesis based kaolin ability as drug carrier amoxicillin. The synthesis process of zeolite begin with calcination of kaolin to methakaolin, then added 3.0 M NaOH solution and stirred for 2 hours. Followed by the process of making zeolite crystals using hydrothermal method at temperature 100oC for 8 hours. Synthetic zeolites was characterized using FTIR, XRD, and SAA instruments. Synthetic zeolites are then used to drug carrier amoxicillin with parameter adsorption and desorption. The results of characterization of the synthesized zeolite seen from the functional groups and diffraction patterns show similarities with zeolite A. The pore diameter of synthetic zeolite is 7.44 Å and its surface area is 3.456 m2/g. While amoxicillin released for zeolite as 1.561 mg/g or 29.144%.
Optimalisasi Konsentrasi Demulsifier pada Proses Demulsifikasi MInyak Mentah dalam Slop Oil Resti, Ade; Kusumastuti, Ella; G, Agnesya Putri; Jumaeri, Jumaeri; Wijayati, Nanik
Indonesian Journal of Chemical Science Vol 9 No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i2.33502

Abstract

Recovery of the crude oil component in slop oil has the potential to increase the economic value of the slop oil component of the crude oil obtained can be reprocessed, with the demulsification process using two kinds of demulsifiers are Dem-02 and Dem-17. The purpose of this research is to study the variations in demulsifier added to the separated water, and effect of optimum concentration to characterize the crude oil added to viscosity, density, %BS&W, water content, oil content, ash content and metal content (Al, Fe, Ca and Si ) after warming up 24 hours. The results showed the amount of concentration variation of the demulsifier affected the amount of the percentage of water seperation. The more concentrations added the more water water sparation. The optimal demulsifier concentration is at 16.000 ppm. The results of SO-01 and SO-02 slop oil characterization before demulsification each had viscosity of 79.0861 cSt and 408.4904 cSt, density of 0.9842 gr / mL and 0.9806 gr / mL, percentage of BS&W 90% and 80% , ash content 0.9376% and 0.9619%. After demulsification of viscosity 10.2124 cSt and 37.0041, density 0.9052 mg / mL and 0.9119 gr / mL, BS&W percentage 30%, oil content 0.8350% and 1.0505%, water content 19.2% , ash content 1.8869% and 1.8822%. Al, Fe, Ca and Si metal content in slop oil. After demulsification increases with increasing ash content slop from demulsification.
Uji Aktivitas Katalitik Hidrodesulfurisasi Campuran Light Gas Oil (LGO) dan Light Diesel Oil (LDO) dengan Katalis CoMo/ γ-Al2O3 Ulya, Isnaeni Nurul; Jumaeri, Jumaeri; Wawan, Wawan; Rahayu, Endah Fitriani; Wijayati, Nanik
Indonesian Journal of Chemical Science Vol 9 No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i2.33525

Abstract

Diesel oil is a fossil fuel that is the main source of energy consumed excessively which can cause problems in the environment such as air pollution. This study aims to eliminate sulfur type impurities in diesel oil by hydrotreating process, one of which is through the hydrodesulfurization process. In this study studied the catalytic activity of CoMo / Al2O3 in the HDS process of LGO and LDO blends using Reactor Fixed-Bed Pilot-Plant scale. The effect of parameters on the HDS process was studied by varying temperatures of 330oC, 350oC, 370oC and the influence of the Liquid Hourly Space Velocity (LHSV) 1 hour-1, 1.5 hours-1, 2 hours-1. The results showed an increase in HDS activity of up to 99.99% at an increase in temperature of 370oC with LHSV 1 hour-1.CoMo/γ-Al2O3 catalyst was able to reduce sulfur content at temperatures of 330oC, 350oC, and 370oC with LHSV 1 hour-1 of 16.56 ppm; 3.85 ppm; 3.79 ppm. From all the results of the analysis it can be concluded that the optimum HDS process at a temperature of 370oC and LHSV 1 hour-1. The decrease in sulfur content obtained is in accordance with European country standards (Euro V), where the sulfur diesel oil content is lower than 10 ppm. The catalytic activity of CoMo/γ-Al2O3 shows that it increases the HDS process and can reduce activation energy by 18.49 Kj/mol.
Esterification of Bio-Oil Produced from Sengon (Paraserianthes falcataria) Wood Using Indonesian Natural Zeolites Kadarwati, Sri; Apriliani, Evalisa; Annisa, Riska Nurfirda; Jumaeri, Jumaeri; Cahyono, Edy; Wahyuni, Sri
International Journal of Renewable Energy Development Vol 10, No 4 (2021): November 2021
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2021.35970

Abstract

The bio-oil produced from pyrolysis of woody biomass typically shows unfavourable characteristics such as high acidity, hence it becomes highly corrosive. An upgrading process, e.g., esterification, is necessary to improve the bio-oil quality prior to its use as a transportation fuel. In this work, the bio-oil was produced through a fast pyrolysis of Sengon wood in a fixed-bed pyrolyser at various temperatures. The characteristics (density, viscosity, total acid number, relative concentration of acetic acid, etc.) of the bio-oil were evaluated. The bio-oil with the highest acidity underwent an esterification catalysed by Indonesian natural zeolites at 70 oC for 0-180 min with a ratio of bio-oil to methanol of 1:3. The catalytic performance of the Indonesian natural zeolites during the esterification was investigated. A significant decrease in the total acid number in the bio-oil was observed, indicating the zeolite catalyst’s good performance. No significant coke formation (0.002-3.704 wt.%) was obtained during the esterification. An interesting phenomenon was observed; a significant decrease in the total acid number was found in the heating up of the bio-oil in the presence of the catalyst but in the absence of methanol. Possibly, other reactions catalysed by the Brønsted and Lewis acids at the zeolite catalyst surface also occurred during the esterification.
The Validity of HOTS Assessment Instrument to Measure Ability of Problem-Solving on Thermochemistry Materials Inayati, Ismi; Susilaningsih, Endang; Jumaeri, Jumaeri
International Journal of Active Learning Vol 7, No 1 (2022): April 2022 Article-in-Press
Publisher : International Journal of Active Learning

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Abstract

This research is motivated by the lack of variety of HOTS questions to measure ability of problem-solving on thermochemistry materials. The objective of this research is to develop a HOTS assessment instrument to measure valid problem-solving abilities on thermochemical materials. The research method used is R&D with a 4D model adapted from Thiagarajan that is converted into 3D, that are define, design, and develope. The subjects of this research were 77 students of class XI MIPA SMA Negeri 1 Pemalang. The data collection sources and methods include: interviews, questionnaires, and tests. The analysis results of the content validity of the instrument obtained that the Aiken'S coefficient in all aspects measured was above 0.75. This shows that the HOTS assessment instrument is very valid. The validity of the construct is seen from the value raw variance explained by measures 48.6% has very good criteria so that the question items are valid. The analysis results of the quality of the HOTS questions to measure problem-solving abilities are seen in terms of the validity of the items, it is known that there are 16 items that are said to be valid and 4 items are said to be invalid because they do not meet the requirements outfit MNSQ, Outfit ZSTD, and Point Measure Correlation.
Co-Authors Afwah, Apriliani Arifatul Agung Tri Prasetya Agung Tri Prasetya Agung Tri Prasetya Akhsanun Nadiyya Alfawwazi, Abdul Fattah Alighiri, Dante Amique, Iqnatu Nazila Ani Rusilowati Anita Rahayu Annisa, Riska Nurfirda Antonius Tri Widodo Arum Mawar Wati Budhy Kurniawan Cepi Kurniawan Darmadinata, Mariyanti Darmadinata, Mariyanti Darojah, Lia Inarotut Darojah, Lia Inarotut Deni Mustika Deninta Andara Perdana E Kusumastuti, E Edy Cahyono Eko Sri Kunarti Elfrida Ratnawati Ella Kusumastuti Ella Kusumastuti, Ella Endang Susilaningsih Endang Susilaningsih Ersanghono Kusumo, Ersanghono Etty Soesilowati Evalisa Apriliani, Evalisa F Widhi Mahatmanti G, Agnesya Putri Habibah, Febrina Nur Haditya, Ervan Bagus Hakim, Yanuar Hakim, Yanuar Harjito - Harjono Harjono Hastuti, Vidya Dwi Hastuti, Vidya Dwi Holyness Nurdin Singadimedja Isbullah, Isbullah Ismi Inayati, Ismi Istiana, shofa Jayanti, Yeni Fitriana Jayanti, Yeni Fitriana Juari Santosa Kamila, Naila Faza Kasmadi Imam Supardi Khafidhotun Naimah Khasanah, Ni'matul Khasanah, Nimatul Khavilla, Vidya Putri Latifah Latifah Latifah Latifah Lubis, Syafrina Yani Machiril, Dhonirul Machiril, Dhonirul Masrukan Masrukan Megasari, Nofita Megasari, Nofita Mohammad Alauhdin, Mohammad Munazat, Dicky Mutiara Dewi Rukmana, Mutiara Dewi Naila Faza Kamila Nanik Wijayati Ningrum, Ananda Nurmalia Kusuma Ningrum, Lis Setiyo Ningrum, Lis Setiyo Nino Rinaldi nurfainzani, pratiwi nurfainzani, pratiwi Nurhidayah Nurhidayah Patricia, Amelinda Diana Patricia, Amelinda Diana Pratiwi Dwi Jananti, Pratiwi Dwi Putri, Witha Berlian Qoyyima, Diana Rahayu, Endah Fitriani Rahmawati, Septiani Yuni Resti, Ade Riyanto, Ari Fajar Rusiyanto Rusiyanto, Rusiyanto S Mursiti Saadah, Nelis Savitri Savitri, Savitri Setyadji, Much. Sigit Priatmoko Sri Haryani Sri Juari Santosa Sri Juari Santosa Sri Kadarwati Sri Wahyuni SRI WARDANI Sucipto, Lukman Sulistyani, Martin Sulistyaningsih, Triastuti Sunarto, Wisnu Sutarno Sutarno Sutarno Sutarno Triastuti Sulistyaningsih Tunjungsari, Faricha Tunnisa, Tasqia Tunnisa, Tasqia Ulya, Isnaeni Nurul unnes, krisnawati kimia unnes, krisnawati kimia Uswatun Hasanah VH Putranto, VH w. Astuti w. T.P. Lestari Wahyu Rahmawati, Aliftia Wahyu Rahmawati, Aliftia Wahyuni, Promes Sari Wardani, Deta Sri Warlan Sugiyo Wawan Rustyawan Wawan Wawan Widiya Aprilianti Winning Kusuma, Alberto Krishna Ksatria Winning Kusuma, Alberto Krishna Ksatria Wisnu Sunarto Woro Sumarni Zulichatun, Siti - Zulichatun, Siti -