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All Journal Jurnal Tadris Kimiya JKPK (Jurnal Kimia dan Pendidikan Kimia) Jurnal Riset Sains dan Kimia Terapan International Journal of Social and Management Studies (IJOSMAS) Chemistry and Materials Satwika: Jurnal Pengabdian kepada Masyarakat PERDULI: Jurnal Pengabdian kepada Masyarakat

Afrizal Afrizal

Departement Of Chemistry Education, Faculty Of Mathematics And Sciences, Universitas Negeri Jakarta ,Jalan Rawamangun Muka, Jakarta 13220

Author-ID : 4330215

Religion Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Social Sciences Other

Published : 12 Documents Claim Missing Document

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Development of Students’ Conceptual Understanding through STEAM Project Integration in Thermochemistry Yuli Rahmawati; Syauqi Faizka Ramadhani; Afrizal Afrizal; Mela Puspitasari; Alin Mardiah
Jurnal Tadris Kimiya Vol 6, No 1 (2021)
Publisher : Department of Chemistry Education, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jtk.v6i1.5498

This study aims to develop students' conceptual understanding by integrating the Science, Technology, Engineering, Art, and Mathematics (STEAM) project in thermochemistry. The qualitative research was employed with interviews, reflective journals, observations, students’ worksheets, and conceptual understanding tests on 40 students in senior high school. The STEAM project was implemented through a project-based learning model to develop students' understanding of exothermic and endothermic, combustion reactions, and enthalpy concepts. The STEAM project being developed is a steamship using three fuels: methanol, ethanol, and palm oil. The results showed that the student's understanding of enthalpy calculation had developed. Otherwise, the concept of exothermic, endothermic, and combustion reaction, especially related to applying the concept in daily life, is still undeveloped. Thus, some of the students experienced misconceptions. Therefore, the integration of contextual learning such as STEAM needs to be continuously applied to provide students with opportunities to develop their conceptual understanding and application in daily life.

Effect Concentrations of Polyethylene Glycol in Stability Structure of Blending Polymer Cholesteryl acrylate-ITO Afrizal Afrizal; Arif Rahman; Iwan Sugiharto; Muhammad Ismail
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 5, No 2 (2020): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v5i2.42502

Polymer ChoAcry/ITO was added glycol is one of the material polymer liquid crystal modifications. In general polymer liquid crystal cholesteryl acrylate was made for many application usage in optoelectronics materials. This research want to study effect Polyethylene Glycol (PEG) in polymer choAcry/ITO for stability structure of blending choAcry/ITO. PEG 0.006 was added to mixed cholesteryl acrylate with ITO. Polymerizations that doing using UV curing photopolymerizations. Characterizations group functions using Fourier Transformed Infra Red (FTIR) and Nuclear Magnetic Resonance (NMR). Effect concentrations of PEG in PolyChoAcry-ITO shown from FTIR spectrum, shown not different. Peak in spectrum showed are C=C and C-H aliphatic, C=C aromatic, C-O ester, and para-benzene. Based on data FTIR that PE-b-PEG not change structures. Therefore, diffractogram of XRD, showed added ITO and PEG can be affect phisycal and chemistry properties of polymer cholestryl acrylate. This data showed PEG changed structures of polymer. Polyethilene glycol spreading into polymer cholesteryl acrylate. In the literatures told that PEG can be conjunctionc between that monomer or polymer cholesteryl acrylate-ITO.

The Effects of Deposition Time on Phase and Structure of FeCoNi Films Muhamad Mulyadi; Afrizal
Chemistry and Materials Vol. 1 No. 2 (2022)
Publisher : Pusat Inovasi Sains

This study aims to determine the effects of deposition time on the phase and structure of FeCoNi. FeCoNi was prepared by electrodeposition method at room temperature. X-ray diffraction measurement shows the formation of a single phase of FeCoNi at 5 and 10 minutes of deposition, while at 20, 35, and 50 minutes, a new phase was formed, namely CoNi. The obtained FeCoNi and CoNi show a crystal plane at 2θ = 44.05° (111); 51.33° (002); and 75.59° (022) in all different deposition times, indicating the face centered cubic crystal structure. The effect of deposition time on the chemicals composition shows an anomalous co-deposition because Fe has a larger ratio than Co and Ni. The deposition rate and the value of current efficiency were found to be optimum at FeCoNi synthesized for 20 minutes, namely 0.00214 mg/cm2s and 97.00%.

PENGARUH PENAMBAHAN SILIKA TERHADAP MEMBRAN SULFONASI POLIETER ETER KETON â€“ AKRILONITRILBUTADIENA STIRENA Eka Fitrianingsih; Yusmaniar Yusmaniar; Afrizal Afrizal
Jurnal Riset Sains dan Kimia Terapan Vol 3 No 1 (2013): JRSKT - Jurnal Riset Sains dan Kimia Terapan, Volume 3 Nomor 1 Juli 2013
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (902.702 KB)

Telah dilakukan penelitian mengenai pengaruh penambahan silika pada membran Sulfonasi Polieter Eter Keton-Akrilonitril Butadiena Stirena untuk aplikasi PEMFC. Variasi dilakukan pada konsentrasi silika sebesar 0%, 3%, 5%, 10%, dan 15% dari berat polimer. Tujuan penambahan silika adalah untuk mendapatkan konsentrasi silika optimum pada membran SPEEK-ABS. Hasil penelitian menunjukkan konsentrasi silika optimum berada pada penambahan silika 3%. Penambahan silika 3% memberikan karakteristik pada membran yaitu mampu meningkatkan konduktivitas ionik sebesar 0.0075 x 10-3 S/cm. Dengan penambahan silika juga dapat meningkatkan swelling terhadap air dan metanol. Analisis gugus sulfonat pada membran dilakukan dengan FTIR dan memperoleh hasil gugus sulfonat membran SPEEK-ABS berada pada bilangan gelombang 1203.58 cm-1.Kata kunci : membran elektrolit, SPEEK, ABS, silika, konduktivitas ionik, swelling. Has done research on the effect of silica on membranes sulfonated polyether ether ketone â€“ acrylonitrile butadiene styrene for applications PEMFC. Variation performed on silica concentration of 0%, 3%, 5%, 10%, and 15% by weigh of use polymer. The purpose of this addition silica is to find the optimum of silica concentration on membranes SPEEK-ABS. The result experiment showed that optimum of silica concentration is 3%. Additionally of 3% silica can be characteristic on membranes is to be increasing ionic conductivity of of 0.0075x10-3 S/cm. With addition silica can be increasing swelling water and methanol. Analysis of group sulfonated membranes is done by FT-IR and getting the wave value is 1203.58 cm-1.Keywords : membranes electrolyte, SPEEK, ABS, silica, ionic conductivity, swelling

Optimasi Konsentrasi Katalis CaO dari Cangkang Telur Ayam Negeri Dalam Reaksi Transesterifikasi Minyak Jarak Pagar (Jatropha curcas L) Sebagai Bahan Biodiesel Zulmanelis Darwis,; Afrizal Afrizal; Eneng Retnisa Sriutami
Jurnal Riset Sains dan Kimia Terapan Vol 2 No 1 (2012): JRSKT - Jurnal Riset Sains dan Kimia Terapan, Volume 2 Nomor 1 Juni 2012
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Penelitian mengenai penggunaan katalis CaO dari cangkang telur pada reaksi transesterifikasi minyak jarak pagar (Jatropha curcas L) dengan metanol bertujuan untuk mendapatkan konsentrasi optimum katalis CaO. CaO diperoleh dengan cara kalsinasi cangkang telur ayam negeri selama 6 jam pada suhu 800Â°C. Hasil karakterisasi dengan XRD (X-Ray Diffraction) menunjukan bahwa katalis CaO hasil kalsinasi pada kondisi tersebut memiliki difraktogram yang sesuai dengan CaO standar. Reaksi transesterifikasi dilakukan dengan merefluks campuran minyak jarak pagar, metanol dan katalis CaO pada beberapa konsentrasi selama 120 menit pada suhu 60Â°C. Rendemen metil ester ditentukan dengan cara menghitung jumlah gliserol yang dibebaskan dalam reaksi transesterifikasi. Dari hasil Penelitian, diketahui bahwa konsentrasi katalis CaO optimum adalah 10% (%-w) dengan hasil metil ester sebesar 82,62% (%-w). Uji kualitas produk menunjukan nilai densitas (40Â°C) 0,86 g/mL, , dan viskositas (40Â°C) 11,67 cSt. serta bilangan asam 0,62 mg KOH/g minyak.KeywordsReaksi transesterifikasi , katalis CaO, X-Ray Diffraction,Rendemen metil ester

PEMANFAATAN SELULOSA BAKTERIAL Nata de coco SEBAGAI ADSORBAN LOGAM CU(II) DALAM SISTEM BERPELARUT AIR Afrizal Afrizal; Agung Purwanto
Jurnal Riset Sains dan Kimia Terapan Vol 1 No 1 (2011): JRSKT - Jurnal Riset Sains dan Kimia Terapan, Volume 1 Nomor 1 Juni 2011
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Abstrak Selulosa bakterial nata de coco merupakan hasil fermentasi Acetobacter xylinum dalam substrat air kelapa. Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi awal larutan dan lamanya waktu kontak terhadap proses adsorpsi Cu(II) pada selulosa bakterial nata de coco. Karakterisasi gugus fungsi selulosa bakterial nata de coco dengan FT-IR menunjukkan adanya puncak serapan pada daerah bilangan gelombang 3433,60 cm-1 yang mengindikasikan adanya gugus OH. Sedangkan pada daerah 2922,10 cm-1 dan 1428,90 cm-1, 1372,84 cm-1 dan 1337,87 cm-1 menunjukkan adanya gugus OH dan CH. Bilangan gelombang pada daerah 1060,25 cm-1, 1034,61 cm-1, 1112,93 cm-1 dan 1163,5 cm-1 menunjukkan adanya gugus C-O. Hasil spektrum FTIR selulosa bakterial nata de coco secara umum mirip dengan spektrum FTIR selulosa komersial. Uji pemanfaatan selulosa bakterial nata de coco sebagai bahan adsorban logam Cu(II) dalam sistem berpelarut air diamati bahwa konsentrasi awal larutan dan Lamanya waktu kontak mempengaruhi besarnya adsorpsi Cu(II) oleh selulosa bakteri Nata de coco. Kapasitas adsorpsi mencapai maksimum yaitu sebesar 1,905 mg/g pada saat konsentrasi awal larutan CuSO4.5H2O 10 mM dan waktu kontak 30 menit. Kata Kunci : selulosa bakterial, nata de coco, adsorpsi Cu(II)

PENGARUH KONSENTRASI INISIATOR 2-HIDROKSI-2-METIL-FENILPROPANON TERHADAP SIFAT KONDUKTIVITAS DAN KARAKTERISTIK KOMPOSIT POLIMER KOLESTERIL AKRILAT-ITO Ahmad Zaini Assidiqih; Afrizal Afrizal; Arif Rahman
Jurnal Riset Sains dan Kimia Terapan Vol 7 No 1 (2017): JRSKT - Jurnal Riset Sains dan Kimia Terapan, Volume 7 Nomor 1 Juli 2017
Publisher : Program Studi Kimia Universitas Negeri Jakarta

This study aims for shyntesized of composite of cholesteryl acrylate polymer-indium tin oxide (PCA-ITO) and the characteristic, and also its conductivity properties. Synthesized of PCA-ITO Composite by using UV Curing method with initiator 2-Hydroxy-2-Methyl PhenylPropanone (Darocur 1173). This research using vary of concentration initiator darcor were 0; 0,125; 0,250; 0,375; 0,500; 0,625 % V/V. The FTIR characterization results show a shift of wave numbers between the PCA-ITO composite FTIR spectrum and its pure cholesteryl arcylate (KA) FTIR spectrum. Based on the XRD diffraction pattern thereis a high intensity peak a 2Î¸=30Â° which is the typical peak of ITO and there is a peak at 2Î¸=7Â° which is the peak of the cholesteryl acrylate-ITO. The greater the initiator concentration the ITO and PCA begin to mix and look at the morphology of the surface with englarged. The LCR Meter data show that the conductivity value of the PCA-ITO composite without the initiator is smaller when compared with the addition of the initiator. Keywords. Cholesteryl acrylate, Indium Tin Oxide, Initiator darocure 1173, Photopolymerization, Conductivity

Pelatihan penyusunan soal interaktif menggunakan platform e-ujian bagi guru-guru kimia di mgmp jakarta timur Irwanto Irwanto; Afrizal Afrizal
PERDULI: Jurnal Pengabdian kepada Masyarakat Vol 3 No 02 (2022): PERDULI: Jurnal Pengabdian kepada Masyarakat
Publisher : LPPM Universitas Negeri Jakarta

Perkembangan teknologi digital telah berdampak positif terhadap cara baru untuk mengevaluasi pembelajaran dan memberikan umpan balik kepada siswa melalui e-assessment. Namun, penyusunan e-assessment yang efisien di level sekolah menenah atas membutuhkan pelatihan. Dengan demikian, pengabdian ini bertujuan untuk memberikan pelatihan penyusunan soal interaktif menggunakan platform e-ujian bagi guru-guru kimia di Jakarta Timur, DKI Jakarta. Peserta adalah 61 guru kimia dari 10 SMA di Jakarta Timur. Pelatihan diselenggarakan pada tanggal 8 September 2022 secara hybrid. Keberhasilan pelatihan dievaluasi menggunakan survey dan dibagikan diakhir kegiatan. Hasilnya menunjukkan bahwa ada peningkatan keterampilan guru dalam mengonstruksi soal-soal dengan bantuan teknologi. Kegiatan ini telah memberikan alternatif solusi bagi guru kimia untuk memudahkan mereka dalam melakukan penilaian. Mitra mengharapkan adanya keberlanjutan program ini.

Optimalisasi Pembelajaran Melalui Peningkatan Kompetensi Guru Dalam Mendesain Model, Metode, dan Media yang Inovatif, Kreatif, Komunikatif-Interaktif dan Menyenangkan Di PAUD/TK Kamboja Berseri 01 Wilayah Binaan Jakarta Nur Aeni Marta; Mindarto; Djunaidi Djunaidi; Sri Martini; Ratu Husmiati; Atikah Afrizal; Widya Putri
Satwika: Jurnal Pengabdian Kepada Masyarakat Vol 2 No 2 (2022): SATWIKA: Volume 2, Number 2, December 2022
Publisher : Fakultas Ilmu Sosial Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/satwika.020205

Artikel ini merupakan hasil dari kegiatan pengabdian kepada masyarakat civitas akademika prodi Pendidikan Sejarah FIS UNJ. Kegiatan ini merupakan bagian dari bentuk nyata peran serta FIS UNJ dalam membina dan membimbing guru yang kompeten dan professional. Tujuan workshop pelatihan ini adalah meningkatkan kompetensi guru guru PAUD Kamboja Berseri RW 01 Kelurahan Kampung Makasar, Jakarta Timur. Guru-guru PAUD ini menajdi pengajar di sekolah tersebut belum memiliki kompetensi sesuai dengan UU N0.20 tahun 2003 tentang Kompetensi Guru dan Dosen. Mereka secara umum adalah lulusan SMA/SMK, sehingga kurang memahami pedagogik untuk usia dini. Guru PAUD seharusnya memiliki kemampuan mengembangkan model pembelajaran yang sesuai dengan kebutuhan siswa, termasuk mampu mengembangkan media yang interaktif dan menyenangkan. Guru merupakan kunci keberhasilan proses kegiatan pembelajaran. Dalam rangka Peningkatan dan pembinaan guru PAUD, agar mampu mendidik anak-anak usia Dini, menjadi anak yang memiliki kompetensi yang seimbang antara intelektual, fisikal, emosional dan spiritual sehingga tumbuh menjadi anak yang tidak hanya memiliki kecerdasan hardskill tetapi juga softskill.

Analysis of Students’s Higher-Order Skills through Project-Based Learning on Acid-Bases Topic Maria Paristiowati; Afrizal Afrizal; Icha Ananda Nainggolan
International Journal of Social and Management Studies Vol. 4 No. 1 (2023): February 2023
Publisher : IJOSMAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5555/ijosmas.v4i1.266

This study aims to analyze higher order thinking skills through a project-based learning model on acid-base material. The project being carried out is to make natural acid-base indicators and to be able to determine the acid-base properties of solutions from the natural acid-base indicators that have been made.This research was conducted from January 2021 to June 2021. This research used a qualitative research method, an interpretive paradigm with 40 students in class XI IPA in Jakarta as subjects. Data collection techniques were carried out by class observation, student and teacher reflective journals, student worksheets and tests of higher order thinking skills.Based on observations, the dominant skill is analyzing skill which is equal to 83.33%, the second skill is evaluating skill which is equal to 79.16%, and the third skill is creating skill amounting to 77.50%. Based on the test results, the dominant skill is analyzing skills by 75.44%, the second skill is evaluating skills by 70.36%, and the third skill is evaluating skills by 69.58%.

Co-Authors Agung Purwanto Ahmad Zaini Assidiqih Alin Mardiah Annisa Ambarwati Arif Rahman Arif Rahman Asep Riswoko Djunaidi Djunaidi Eka Fitrianingsih Eneng Retnisa Sriutami Icha Ananda Nainggolan Irwanto, I. Iwan Sugiharto Mela Puspitasari Mindarto Muhamad Mulyadi Muhammad Ismail Paristiowati, Maria Ratu Husmiati Setia Budi Sri Martini Syauqi Faizka Ramadhani Triyana Wahyu Setyorini Widya Putri Yuli Rahmawati Yusmaniar Zulmanelis Darwis,

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