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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Penelitian dan Pembelajaran IPA KOVALEN: Jurnal Riset Kimia FLUIDA Fullerene Journal of Chemistry Kumawula: Jurnal Pengabdian Kepada Masyarakat
Suryadi, Joko
Politeknik Negeri Bandung
Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Materials Science & Nanotechnology Social Sciences

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Pembuatan dan Penentuan Nilai Efisiensi Sel Surya Berpewarna Tersensitisasi dengan Senyawa Antosianin dari Buah Manggis (Garcinia mangostana L.) sebagai Pewarna Pensensitisasi Suryadi, Joko; Gunawan, Gunawan; Haris, Abdul
Jurnal Kimia Sains dan Aplikasi Vol 13, No 3 (2010): Volume 13 Issue 3 Year 2010
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (657.035 KB) | DOI: 10.14710/jksa.13.3.88-94

Abstract

Telah dilakukan penelitian mengenai pembuatan dan penentuan nilai efisiensi DSSC dengan senyawa antosianin dari kulit buah manggis sebagai pewarna pensensitisasi. Penelitian ini bertujuan untuk membuat rancangan DSSC, mengkarakterisasi penyusunnya dan menentukan nilai efisiensinya. Penelitian dilakukan dengan pembuatan elektroda kerja (working electrode) dari lapis tipis TiO2 yang mengadsorb antosianin kulit buah manggis, elektroda perlawanan (counter electrode) dari karbon dan elektrolit I-/I3- sebagai pasangan redoks. Karakterisasi DSSC meliputi kristalinitas TiO2, ukuran rongga dan ketebalan lapis tipis TiO2, serapan panjang gelombang maksimum zat pewarna, analisis gugus fungsi antosianin serta ikatan antara TiO2 dengan molekul antosianin. Nilai efisensi DSSC ditentukan dengan metode kurva arus dan tegangan. Hasil penelitian menunjukkan karakterisasi masing-masing penyusun DSSC telah memenuhi syarat sebagai rancangan DSSC dan nilai efisiensi rancangan DSSC adalah sebesar 2,2 x 10-3 %.
The Implementation of Discovery Learning Method to Increase Learning Outcomes and Motivation of Student in Senior High School Nanda Saridewi; Joko Suryadi; Nur Hikmah
Jurnal Penelitian dan Pembelajaran IPA Vol 3, No 2 (2017): Available Online in November 2017 (Web of Science Indexed)
Publisher : Department of Science Education, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (427.61 KB) | DOI: 10.30870/jppi.v3i2.782

Abstract

Abstract Based on data from the observation of high school students grade XI that daily low student test scores due to a lack of role of students in the learning process. This classroom action research aims to improve learning outcomes and student motivation through discovery learning method in colloidal material. This study uses the approach developed by Lewin consisting of planning, action, observation, and reflection. Data collection techniques used the questionnaires and ability tests end. Based on the research that results for students received a positive influence on learning by discovery learning model by increasing the average value of 74 students from the first cycle to 90.3 in the second cycle and increased student motivation in the form of two statements based competence (KD) categories (sometimes) on the first cycle and the first statement KD category in the second cycle. Thus the results of this study can be used to improve learning outcomes and student motivation. Keywords: Discovery Learning Method, Learning Outcomes, Student Motivation, Colloid
Pengaruh Ukuran Adsorben Kulit Pisang Kepok terhadap Penurunan Nilai Asam Lemak Bebas Minyak Goreng Bekas Joko Suryadi; Endang Widiastuti; Mohammad Idris Asyraf Ali; Zulfany Ali
Fluida Vol 12 No 2 (2019): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v12i2.1616

Abstract

Penelitian ini bertujuan untuk mengukur tingkat perbaikan kualitas terhadap jelantah yang dapat dilakukan kulit pisang kepok. Minyak jelantah yang digunakan dalam penelitian ini diperoleh dari penjual gorengan dan didiamkan selama 24 jam sebelum diproses lebih lanjut. Metode adsorpsi yang akan dilakukan dalam penelitian ini adalah metode batch pada temperature 40 oC dengan waktu kontak pada 30 dan 60 menit. Kecepatan pengadukan diatur pada 500 rpm. Ukuran adsorben divariasikan pada 35, 60, dan 230 mesh. Karakterisasi yang dilakukan pada adsorben adalah kapasitas adsorpsi dengan variasi massa menggunakan metode iodin. Parameter kualitas jelantah adalah persen perubahan nilai asam lemak bebas sebelum dan sesudah perlakuan adsorpsi. Karakteristik kulit pisang sebagai adsorben dengan efisiensi terbesar ditunjukkan pada kulit pisang pada ukuran 230 mesh sebanyak 2 gram sebesar 73,38%. Persentase penurunan asam lemak bebas terbesar ditunjukkan pada kulit pisang pada ukuran 35 mesh dengan pengadukan selama 60 menit dengan nilai 8,57%.
Perbandingan Efektivitas Ampas Teh Hitam dan Ampas Teh Hijau sebagai Adsorben Ion Logam Cr (VI) Rahma Gurroh Muhajjalin; Inayah Agawijaya; Budi Santoso; Joko Suryadi
Jurnal Kimia Fullerene Vol 6 No 2 (2021): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v6i2.327

Abstract

Industrial waste contains various hazardous chemical compounds, such as heavy metals, one of which is chromium hexavalent ion, Cr (VI). Cr (VI) ion is carcinogenic and has toxic effects on humans. A study to treat Cr (VI) ion waste by adsorption using tea dregs has been carried out. Two types of tea dregs, black tea and green tea dregs are used as adsorbents, to compare their adsorption effectiveness. Adsorption effectiveness was determined using the visible-spectrophotometer. Parameters such as pH, adsorbent mass and concentration of Cr (VI) ions were optimized. Study determination of the adsorption isotherm model for each tea dregs included. The results showed that black tea dregs produced greater effectiveness than green tea dregs, with optimum adsorption conditions at pH 2, adsorbent mass of 0,8 grams and Cr (VI) ion concentration of 100 ppm with 99,50% removal efficiency. Meanwhile, green tea dregs produced the optimum adsorption conditions at pH 2, adsorbent mass of 0,4 grams and Cr (VI) ion concentration of 50 ppm with 87,49% removal efficiency. Langmuir adsorption isotherm model is fit for adsorption process by black tea dregs, meanwhile, green tea dregs fit with Freundlich and Langmuir isotherm model.
RANCANG BANGUN SISTEM PENGOLAHAN AIR JERNIH DI KAMPUNG WISATA SABLON Rony Pasonang Sihombing; Agustinus Ngatin; Joko Suryadi; Retno Dwi Jayanti; Yunus Tonapa Sarungu; Robby Sudarman
Kumawula: Jurnal Pengabdian Kepada Masyarakat Vol 5, No 1 (2022): Kumawula: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/kumawula.v5i1.35907

Abstract

Air bersih yang memadai secara kuantitas, kualitas dan kontinuitas merupakan kebutuhan penting untuk kelangsungan hidup manusia. Oleh karenanya diperlukan suatu instalasi pengolahan air untuk menunjang kebutuhan ini. Air tanah merupakan air yang belum mengalami proses pengolahan dengan kriteria kualitas air yang sudah mendekati air bersih. Metode pengolahan air yang dilakukan menggunakan metode filtrasi fisik dan kimia sebelum digunakan untuk kebutuhan sehari-hari. Jenis filter yang digunakan adalah filter benang ukuran 10 µm, filter polipropilen (PP) 10 µm  dan filter karbon aktif. Berdasarkan hasil rancangan, air yang dihasilkan pada sistem rancang bangun diantaranya adalah air dengan kualitas kesadahan 2.3 NTU, masa pakai filter benang 14 hari/bulan, filter PP 2.4 hari/bulan, dan filter karbon aktif 30 hari/bulan. Untuk kemudahan operasional, sistem rancang bangun untuk filter PP dibuat paralel 3 agar perawatan dapat dilakukan setiap minggu.
Isolasi dan Pemurnian Protein dari Lembaga Jagung (Corn Germ) Menggunakan Metode Presipitasi dan Dialisis: Protein Isolation and Purification from Corn Germ Using Precipitation and Dialysis Methods Nancy Siti Djenar; Joko Suryadi
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 1 (2022): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i1.15790

Abstract

The protein contained in corn germ can be used as a raw material that has the potential to provide many benefits in the food, pharmaceutical, and plastic industries. Corn germ with the highest content of protein is around 12-18.4%. In this study, protein from corn germ was isolated and homogenized using tris buffer HCl at pH 7.2. To obtain the protein fraction, precipitation was carried out (salting-out) using a solution of (NH4)2SO4 with saturation levels of 25%, 50%, and 70% respectively. The purification process was carried out by dialysis for 24 hours. The dialysis produced pure protein with a concentration of 4.161%. Based on the identification of functional groups using an FT-IR spectrophotometer, it was shown that the isolated and purified corn germ protein contained four absorption bands, including amide A (3211.48 cm-1 and 3226.91 cm-1), amide I (1633 cm-1 and 1629.85 cm-1), amide II (1527 cm-1 and 1552.70 cm-1) and amide III (1296.16 cm-1). The four absorption bands correspond to the wavenumbers of corn protein stated in the literature and are estimated to contain albumin, globulin, glutelin, and zein.
Pengaruh Penambahan Minyak Zaitun Terhadap Karakteristik dan Reologi Edible Film Berbahan Dasar Gluten: The Effect of Addition of Olive Oil on The Properties and Rheology of Gluten-Based Edible Films Nancy Siti Djenar; Joko Suryadi; Nisa Siti Nursaadah; Erina Putri
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 2 (2022): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i2.15948

Abstract

Gluten vegetable protein can be used as an alternative source of biopolymer as the basic material for edible film other than polysaccharides. Gluten-based edible films have a poor water vapor barrier and high cohesive and viscoelastic properties, therefore the addition of lipids and plasticizers is required. In this study, olive oil was added to reduce its permeability to water vapor, while glycerin was added to produce a more flexible edible film. The results showed that the addition of 1% olive oil could reduce the lowest water vapor transmission rate of 9.14 g/m2/24 hours with a thickness of 0.248 mm, tensile strength of 16.64 mPa, and elongation of 419.5%. The four characteristics are in accordance with the Japanese Industrial Standard. The antimicrobial testing on edible films showed that the addition of 0-2% olive oil could inhibit the growth of E. coli, while A. niger and R. oryzae 0-2% olive oil could not inhibit the growth of the two fungi. The measurement of optical properties showed that the transparency of the edible film was highest at the addition of 0% olive oil at 55%. The highest opacity value was with the addition of 1% olive oil, which is 2.96. The Fourier Transform Infrared (FTIR) identification showed that the edible film added with 1% olive oil had three characteristic absorption bands from gluten, olive oil, and an absorption band from glycerin. These bands indicate that olive oil, glycerin, and gluten do not react but only physically interact. The measurement using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometer (EDS) showed that the microstructure of gluten-based edible film produces a varied structure where the gluten structure network can be clearly observed and contains elements of C, O, N where the intensity of C and O elements of 160-400 cps and 30-100 cps, respectively.
Co-Authors Abdul Haris Budi Santoso Erina Putri Gunawan Gunawan Inayah Agawijaya Jayanti, Retno Dwi Mohammad Idris Asyraf Ali Nancy Siti Djenar Nanda Saridewi, Nanda Ngatin, Agustinus Nisa Siti Nursaadah Nur Hikmah Rahma Gurroh Muhajjalin Robby Sudarman Sihombing, Rony Pasonang Widiastuti, Endang Yunus Tonapa Sarungu Zulfany Ali