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All Journal Jurnal Natur Indonesia Jurnal Teknik Kimia USU The Journal of Experimental Life Sciences (JELS) Jurnal Ilmu Kimia Universitas Brawijaya Natural B The Journal of Pure and Applied Chemistry Research Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Jurnal Teknik Kimia USU Jurnal Ilmiah Berkala: Sains dan Terapan Kimia JURNAL REKAYASA KIMIA & LINGKUNGAN
Bambang Ismuyanto
Brawijaya University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Neuroscience

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Pengaruh Suhu Ekstraksi dan Kecepatan Pengadukan terhadap Karakteristik Crude Ekstrak Stevia Dewi, Luthfi Kurnia; Milenia, Rohmah; Islam, Livya Safira; Ismuyanto, Bambang
Jurnal Teknik Kimia USU Vol. 13 No. 2 (2024): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v13i2.17131

Abstract

Stevia is a natural sweetener that is 250-300 times sweeter than sucrose and is low in calories. Stevia sweeteners are obtained from the extraction of stevia leaves. This study aims to determine the effects of temperature and stirring speed on the characteristics of crude stevia extract (yield, brix value, and IR spectrum). Maceration extraction was conducted with 70% ethanol for 1 hour, varying the temperature (28 ℃, 40 ℃, 55 ℃) and stirring speed (0 rpm, 50 rpm, 100 rpm, 150 rpm). The results showed that a temperature of 40 ℃ produced the highest yield at each stirring speed. The yield increased with the increase in stirring speed at each extraction temperature. The highest brix value was obtained at 55 ℃ and a stirring speed of 150 rpm. The IR spectrum results showed that the functional groups in the crude stevia extract were almost identical to those in commercial stevia.
Pengaruh Suhu Ekstraksi dan Kecepatan Pengadukan terhadap Karakteristik Crude Ekstrak Stevia Dewi, Luthfi Kurnia; Milenia, Rohmah; Islam, Livya Safira; Ismuyanto, Bambang
Jurnal Teknik Kimia USU Vol. 13 No. 2 (2024): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v13i2.17131

Abstract

Stevia is a natural sweetener that is 250-300 times sweeter than sucrose and is low in calories. Stevia sweeteners are obtained from the extraction of stevia leaves. This study aims to determine the effects of temperature and stirring speed on the characteristics of crude stevia extract (yield, brix value, and IR spectrum). Maceration extraction was conducted with 70% ethanol for 1 hour, varying the temperature (28 ℃, 40 ℃, 55 ℃) and stirring speed (0 rpm, 50 rpm, 100 rpm, 150 rpm). The results showed that a temperature of 40 ℃ produced the highest yield at each stirring speed. The yield increased with the increase in stirring speed at each extraction temperature. The highest brix value was obtained at 55 ℃ and a stirring speed of 150 rpm. The IR spectrum results showed that the functional groups in the crude stevia extract were almost identical to those in commercial stevia.
Kinetika Reaksi Transesterifikasi Menggunakan Microwave pada Produksi Biodiesel dari Minyak Jarak Poerwadi, Bambang; Ismuyanto, Bambang; Rosyadi, Ahmad Ridwan; Wibowo, Ayu Indah
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 3 No. 1 (2019)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (621.483 KB) | DOI: 10.21776/ub.rbaet.2019.003.01.02

Abstract

Biodisel merupakan alternative bahan bakar yang ramah lingkungan untuk mengurangi penggunaan bahan bakar fossil. Dalam penelitian ini, biodisel diproduksi melalui reaksi transesterikasi minyak jarak dengan menggunakan microwave. Transesterifikasi divariasi pada suhu 45-65oC dan waktu 2-6 menit dengan rasio mol metanol dan minyak 7,5:1 serta KOH 1,5% terhadap berat total minyak dan metanol dalam microwave. Konversi minyak jarak menjadi biodisel dilihat dari metil ester yang terbentuk dan dianalisis menggunakan GC-FID. Pada penelitian ini, konstanta laju reaksi dan energi aktivasi reaksi transesterifikasi minyak jarak dengan katalis KOH dengan menggunakan microwave dihitung dan dievaluasi secara detail. Konstanta laju reaksi transesterifikasi rata-rata yang dihasilkan untuk temperatur operasi 65, 60, 55, 50, dan 45 oC secara berurutan adalah 1,222 L/mol.menit; 1,930 L/mol.menit; 2,002 L/mol.menit; 1,666 L/mol.menit dan 1,608 L/mol.menit. Energi aktivasi reaksi transesterifikasi yang dihasilkan sebesar 18,91 kJ/mol, dimana lebih kecil dibandingkan dengan transesterifikasi menggunakan pemanasan langsung.
KONVERSI AMPAS TEBU MENJADI BIOCHAR DAN KARBON AKTIF UNTUK PENYISIHAN Cr(VI) Pratama, Borneo Satria; Aldriana, Putri; Ismuyanto, Bambang; Hidayati, A.S Dwi Saptati Nur
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 2 No. 1 (2018)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (463.974 KB) | DOI: 10.21776/ub.rbaet.2018.002.01.02

Abstract

Ampas tebu merupakan residu hasil penggilingan tanaman tebu setelah diambil niranya. Ampas tebu dapat dioptimalkan nilai guna dan fungsinya sebagai teknologi alternatif, yakni sebagai bahan pembuatan karbon aktif yang dapat digunakan sebagai adsorben untuk menghilangkan Cr(VI). Penelitian ini bertujuan untuk mengetahui pengaruh suhu karbonisasi terhadap karakteristik biochar ampas tebu serta adanya aktivasi dengan KOH. Karbonisasi dilakukan pada suhu 400, 450, 500, 550 dan 600°C di dalam reaktor fixed-bed dengan mengalirkan gas nitrogen (N2) dengan aliran konstan selama 2 jam. Karbon aktif dihasilkan melalui proses aktivasi biochar hasil karbonisasi suhu 600°C dengan metode perendaman menggunakan larutan kalium hidroksida (KOH) 4 M pada suhu ruang selama 24 jam. Karakteristik yang didapatkan menunjukkan bahwa semakin tinggi temperatur karbonisasi dapat menghasilkan luas permukaan biochar lebih besar dengan kandungan abu yang semakintinggi. Proses aktivasi pada biochar 600°C menggunakan KOH dapat menghasilkan karbon aktif dengan luas permukaan yang sangat besar, yaitu 1259,048 m2 /g disertai dengan penurunan kadar abu. Luas permukaan  adsorben yang semakin besar dapat berpengaruh pada peningkatan kemampuan penyisihan Cr(VI) dari dalam larutan.
Pengaruh Tegangan Elektrokoagulasi dan Konsentrasi Awal Pewarna terhadap Persentase Penyisihan Remazol Red RB Afifa, Ulfiana Ihda; Hidayanti, Anisa; Ismuyanto, Bambang; Juliananda, Juliananda
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 5 No. 2 (2021)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rbaet.2021.005.02.01

Abstract

Limbah cair industri batik memiliki dampak buruk bagi lingkungan apabila langsung dibuang tanpa pengolahan. Meningkatnya produksi pada industri batik menyebabkan limbah cair yang dihasilkan juga semakin meningkat. Remazol Red Rb merupakan salah satu sumber polutan dari limbah cair dari proses pewarnaan pada industri batik. Metode konvensional untuk pengolahan limbah cair masih memiliki kekurangan sehingga memerlukan metode pengolahan limbah alternatif, yaitu metode elektrokoagulasi. Elektrokoagulasi merupakan proses destabilisasi koloid melalui proses elektrokimia. Proses elektrokoagulasi dilakukan dengan memvariasikan tegangan dan konsentrasi awal pewarna yaitu 10 volt, 15 volt, 20 volt, 25 volt pada konsentrasi 100 ppm, 150 ppm, 200 ppm, dan 250 ppm. Untuk mengetahui pengaruh tegangan dan konsentrasi awal pewarna maka dilakukan pengukuran terhadap penyisihan pewarna menggunakan spektrofotometer UV-Vis. Proses elektrokoagulasi menggunakan aluminum sebagai anoda dan besi sebagai katoda. Penelitian dilakukan pada rangkaian elektroda monopolar seri pada volume limbah 200 mL selama 60 menit. Hasil penelitian menunjukkan bahwa tegangan dan konsentrasi awal mempengaruhi terhadap penyisihan pewarna pada limbah cair sintetis Remazol Red RB. Tegangan listrik dan konsentrasi awal terbaik pada rentang variabel penelitian ini adalah 25 volt pada 100 ppm dengan persentase penyisihan sebesar 99,80% setelah10 menit elektrokoagulasi.
Preparation and Characterization of Interfacially Polymerized Polyamide Membrane for Dye Removal Nurul Faiqotul Himma; Bambang Ismuyanto; AS Hidayati; Juliananda Juliananda; Hidayatul Rohmawati; Irfan Budiarta
Jurnal Rekayasa Kimia & Lingkungan Vol 16, No 1 (2021): Jurnal Rekayasa Kimia & Lingkungan (June, 2021)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v16i2.20337

Abstract

Interfacial polymerization of polyamide was conducted using hydrophobic and hydrophilic membrane support. The effects of monomer concentration were investigated, and the resulting thin-film composite membranes were tested for their performance in dye removal using different flow configurations. The results showed that a dense polyamide layer was successfully formed on the hydrophilic support, while a polyamide layer with a very loose structure was formed on the hydrophobic support. The polyamide layer became smoother and more hydrophilic as the concentration of trimesoyl chloride was increased, leading to increased permeate flux and reduced dye rejection. The highest sunset yellow rejection of 45.7% with a permeate flux of 4.9 L/m2.h was obtained when the polyamide layer was formed from trimesoyl chloride concentration of 0.05 w/v% (a high amine to acid chloride monomer ratio of 20) and the filtration was in cross-flow configuration.
Reduction of Remazol Brilliant Blue-R Dye Levels Through Electrocoagulation Process at Laboratory Scale to Reduce Pollution Levels of Textile Industrial Waste in River Streams Sholichin, Moh.; Ismuyanto, Bambang; Saptati N. H., A. S. Dwi; Susilo, H.
The Journal of Experimental Life Science Vol. 13 No. 3 (2023)
Publisher : Graduate School, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jels.2023.013.03.07

Abstract

The textile industry produces liquid waste, which is the main cause of pollution in rivers. Textile industry wastewater has a dye content of about 40%. Electrocoagulation is one method that is able to reduce waste by using electrolysis reactions. This study aims to analyze the level of the electrode plan’s capability to reduce the level of dye waste pollution from the industry on a laboratory scale. The submerged electrode material was 7 cm x 8 cm, 7 cm x 10 cm, and 7 cm x 12 cm in dimensions. The electrocoagulation process was run for 120 minutes with a voltage of 30 volts and stirring at 200 rpm. Samples were taken at 0, 5, 15, 30, 45, 60, and 120 minutes for the electrocoagulation process. Determination of the maximum wavelength of Remazol Brilliant Blue-R was carried out by measuring 60 ppm of Remazol Brilliant Blue solution at various wavelengths in the range of 400 - 800 nm with 1 nm intervals. Measurements were carried out using a UV-Vis spectrophotometer. First-order and second-order reaction kinetics models were used to study the reaction kinetics of the Remazol Brilliant Blue-R electrocoagulation process. The highest efficiency in the Remazol Brilliant Blue-R reduction process was obtained at 86% at 120 minutes. The kinetics of the Remazol Brilliant Blue-R electrocoagulation process using aluminum-based electrodes was under the first order with an R2 value > 0.96. Keywords: Electrocoagulation, Industrial Wastewater, Remazol Brilliant Blue-R, UV-Vis Spectrophotometer.
Co-Authors A.S. Dwi Saptati N. Hidayati, A.S. Dwi Saptati N. A.S. Dwi Saptati Nur Hidayati Afifa, Ulfiana Ihda Aldriana, Putri Alvin Juniawan Ani Mulyasuryani Anugrahini, Sarah Fitria Agung AS Dwi Saptati Nur Hidayati, AS Dwi Saptati Nur AS Hidayati Astrid Herawati, Astrid Bambang Poerwadi Barlah Rumhayati Barlah Rumhayati Belda Amelia Junisu, Belda Amelia Citra Dewi Rakhmania, Citra Dewi Danar Purwonugroho Ellya Indahyanti Evi Handayani, Evi Hidayanti, Anisa Hidayati, A.S Dwi Saptati Nur Hidayatul Rohmawati Indah Khaeronnisa, Indah Irfan Budiarta Islam, Livya Safira Julia Nanda, Julia Juliananda Juliananda Juliananda, Juliananda Luthfi Kurnia Dewi, Luthfi Kurnia Masruri Masruri Milenia, Rohmah Minarni, Neni Moh. Sholichin Nalita Widya Restu Nurul Faiqotul Himma Nurul Faiqotul Himma, Nurul Faiqotul Pratama, Borneo Satria Riistika Asti, Riistika Rosyadi, Ahmad Ridwan Saptati N. H., A. S. Dwi Silva Kurniawan Susilo, H. Sutrisno, Sutrisno Tutik Setianingsih Wibowo, Ayu Indah