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All Journal Jurnal Teknik Kimia USU KOVALEN: Jurnal Riset Kimia E-Dimas: Jurnal Pengabdian kepada Masyarakat CHEESA: Chemical Engineering Research Articles Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia FLUIDA Fullerene Journal of Chemistry Borneo Engineering: Jurnal Teknik Sipil International Journal of Applied Technology Research Equilibrium Journal of Chemical Engineering REACTOR : Journal of Research On Chemistry And Engineering Jurnal Teknik Kimia USU Industrial Research Workshop and National Seminar Journal of Innovative and Creativity Journal Serambi Engineering (JSE)
Keryanti, Keryanti
Jurusan Teknik Kimia, Politeknik Negeri Bandung
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The Effect of Cabbage Waste Concentration and Fermentation Time on The Decaffeination of Arabica Coffee Hariyadi, Tri; Keryanti, Keryanti; Asih, Ria Puspa; Ahmad, Zidni Zakiyyah
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 2 (2024): June 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i2.129

Abstract

The purpose of this study was to determine the effect of the concentration of cabbage waste and fermentation time on the caffeine content reduction of Arabica coffee from Pangalengan. Decaffeination is carried out using a wet fermentation method using protease enzyme activity produced by lactic acid bacteria from cabbage waste. Protease enzymes can break down the slime layer on coffee beans so that caffeine is decomposed through the esterification process to become chlorogenic acid. Fermentation was carried out anaerobically in a fermenter with a capacity of ± 2L with a fermentation time of 72 hours and sampling every 6 hours. The concentration of cabbage waste ranged from 10-80% (w/w). Arabica coffee beans were tested for caffeine content (%) using a UV-Vis spectrophotometer. According to the study's findings, the caffeine level decreases as the concentration of cabbage waste increases. Meanwhile, the caffeine level decreases as fermentation time increases. The addition of 80% concentration of cabbage waste with 48 hours of fermentation time produced the optimum results for the Arabica coffee decaffeination process. This method achieved a decaffeination efficiency of more of 96% and met the quality standards outlined in SNI 01-3542-2004.
Pengaruh Penambahan Polyvinyl Alcohol (PVOH) pada Biofoam dari Tepung Biji Nangka dan Ampok Jagung dengan Metode Thermopressing Fitrianti, Yanis; Azzahra, Rheisya Talitha; Kusumawati, Endang; Keryanti
Jurnal Teknik Kimia USU Vol. 12 No. 2 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i2.9228

Abstract

Starch and fiber-based biofoam as a solution to replace the role of styrofoam. However, the biofoam still unqualified as a good foam characteristic. Polyvinyl alcohol (PVOH) is added to improve the physical characteristics of biofoam. This study aims to determine the effect of PVOH addition on the quality of starch-based biofoam from jackfruit seeds and corn hominy. The gelatinization process was carried out using a mixer in 350 rpm speed at 100 °C for 5 minutes, then moulded in a thermopressing unit for 25 minutes at 100 °C. The characteristics of the material with amylose and amylopectin contents 17.30% and 31.60% respectively and corn hominy's fiber content at 2.72%. The best PVOH addition was 10% addition based on its characteristics from parameters such as water absorption, density, and biodegradability were close to Synbra Technology’s standard. However, all the physical and mechanical characteristics of the produced biofoam still can't reach the standard.
Validasi Metode Analisis Iodin Secara Spektrofotometri UV-Vis pada Dua Variasi Pelarut: Validation of The Method of Iodin Analysis by Uv-Vis Spectrofotometry with Two Variations of Solution Abdilah, Fauzi; Karina Aulia Rahmawati; Widya Tresna Dewi; Keryanti; Hulupi, Mentik
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 3 (2023): December 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.2023.v9.i3.16448

Abstract

In this study, the method of analysis of iodine by UV-Vis spectrophotometry was validated. Two other solvents, ethanol, and cyclohexane were used to validate this approach. The UV-Vis Spectrophotometer method's linearity, detection, and quantization limitations, precision, and accuracy were investigated as variables. The results of the linearity tests indicated that the method was proportionally verified because the r values for the two iodine solutions in ethanol and cyclohexane varied between 0.990 and 0.999, respectively. This suggests that the values were higher than 0.99. The LOD values for the ethanol solvent were 4.441 mg/kg and the LOQ was 14.802 mg/kg, whereas the cyclohexane solvent had an LOD value of 2.660 mg/kg and the LOQ was 8.866 mg/kg. According to the required precision acceptance, the %RSD value of 2%, precision values for both standard iodine solutions with two modifications of solvents demonstrated good results. Recovery percentages of ethanol solvents are 96% and cyclohexane solvents are 86%, respectively, according to accuracy measurements. The combined uncertainty value for this test is 0.109 for the ethanol solvent and 0.019 for the cyclohexane solvent, respectively. This research provides a comprehensive understanding of the validity of the iodine analysis method, establishing a robust foundation for the sustainability and reliability of using UV-Vis spectrophotometer in the analysis
Penentuan pH dan Suhu Optimum Isomerisasi Pembuatan Sirup Fruktosa dari Hidrolisat Onggok Menggunakan Katalis Mg/Al Keryanti, Keryanti; Permanasari, Ayu Ratna; Hidayah, Resti Nurul; Hasanah, Rizkiya
CHEESA: Chemical Engineering Research Articles Vol. 5 No. 1 (2022)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v5i1.10243.1-12

Abstract

Onggok merupakan limbah padat yang dihasilkan dari industri tepung tapioka yang masih mengandung karbohidrat dalam bentuk pati sebesar 70,37%, amilosa 17,22% dan amilopektin 53,15%. Onggok berpotensi untuk diolah menjadi sirup fruktosa melalui proses hidrolisis pati yang dilanjutkan dengan isomerisasi gula hidrolisat. Penelitian ini bertujuan untuk menentukan pH dan suhu optimum isomerisasi pembuatan sirup fruktosa dari hidrolisat onggok melalui eksperimen dan analisis Response Surface Methodology (RSM). Proses hidrolisis untuk memecah pati menjadi glukosa dilakukan secara enzimatis, sedangkan isomerisasi untuk mengubah glukosa menjadi fruktosa dilakukan menggunakan katalis hidrotalsit Mg/Al yang disintesis sendiri. Variasi pH dan suhu isomerisasi ditentukan menggunakan desain eksperimen RSM. Dari percobaan didapatkan bahwa kondisi optimum isomerisasi yaitu pada pH 7 dan suhu 120 oC dengan yield sebesar 36,19% dan selektivitas sebesar 25,88%. Selanjutnya, melalui contour plot dan surface plot dari analisis RSM dapat diprediksi bahwa yield dan selektivitas fruktosa dapat mencapai masing-masing sebesar 17,87% dan 35,07% pada pH 6,58 dan suhu 126,2 °C.
Kuat Tekan Self-Healing Concrete Berbasis Enkapsulasi Xanthan Gum Hafizh, Muhammad; Mauludin, Luthfi Muhammad; Keryanti, Keryanti; Susanto, Ambar
Borneo Engineering : Jurnal Teknik Sipil Volume 8 Nomor 3 Tahun 2024
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v8i3.5877

Abstract

This study aims to determine the reaction and performance of self-healing concrete using Bacillus megaterium encapsulation with xanthan gum coating through a simple extrusion method. The focus of the study is on the effect of adding xanthan gum microcapsules on the compressive strength of concrete and determining the optimal microcapsule content. The percentage of xanthan gum microcapsules used is 1,2,3,4, and 5%. Based on the test results, the addition of 2% xanthan gum microcapsules provides the highest compressive strength, which is 25.6 MPa on the 7th day and 34.1 MPa on the 28th day. Further test results show that although the addition of 5% microcapsules provides the greatest strength return, the use of higher amounts of microcapsules actually reduces the overall concrete strength. Therefore, the optimal microcapsule content to be added to the concrete mixture is 2%, which provides the best balance between increasing strength and material stability.
Penyediaan Alat Penghancur Sampah Organik agar Maggot Lebih Maksimal Mengolah Sampah Menjadi Pupuk Kompos Chamidy, Harita Nurwahyu; Astor, Yackob; Keryanti, Keryanti; Min, Joe Lian; Djatnika, Tjetjep; Pudin, Apip; Amalia, Dewi
E-Dimas: Jurnal Pengabdian kepada Masyarakat Vol 14, No 3 (2023): E-DIMAS
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/e-dimas.v14i3.12884

Abstract

Longsornya Tempat Pembuangan Akhir (TPA) Sarimukti membuat tumpukan sampah di Tempat Pembuangan Sampah (TPS) semakin menggunung dan munculnya TPS liar yang dapat mencemari lingkungan. Alternatif pengolahan sampah organik yaitu dengan memanfaatkan maggot. Jika tersedia sarana pengolahan sampah yang lengkap dan budidaya Maggot dilakukan secara benar, maka berpotensi dapat mengatasi permasalahan sampah dan menghasilkan keuntungan. Mitra telah mencoba melakukan pengolahan sampah organik menggunakan Maggot. Namun, masih ada permasalahan yang terjadi pada Mitra Pengabdian kepada Masyarakat (PkM) yaitu tidak adanya alat penghancur sampah sehingga tidak dapat diolah maksimal oleh Maggot. Kegiatan PkM ini yaitu melakukan sosialisasi mengajak warga untuk memilah sampah organik dan anorganik di rumah masing-masing, kemudian mendistribusikan sampah ke lokasi pengolahan, dan pembuatan alat penghancur sampah organik. Manfaat kegiatan PkM bagi Mitra adalah memberikan kontribusi berupa teknologi peralatan penghancur sampah dan bertambah banyak masyarakat yang berkontribusi dalam pengelolaan ini sebagai solusi pengolahan sampah yang efektif, efisien, murah, dan dapat memberikan keuntungan bersama.
Sintesis Zn-BDC dengan Metode Sonokimia dan Aplikasinya Pada Proses Adsorpsi Ion Logam Pb2+ Abdilah, Fauzi; Hulupi, Mentik; Keryanti, Keryanti; Nabilah, Nida; Nabilah, Tiana Hasana
REACTOR: Journal of Research on Chemistry and Engineering Vol. 3 No. 1 (2022)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/

Abstract

The heavy metal ion pollution such as lead (Pb2+) in wastewater is an environmental problem that needs to be solved. The adsorption method has been reported to have good potential as an alternative method for reducing heavy metal contents in aquatic environment. The most widely used adsorbent media are porous materials with a large surface area and low density. Metal Organic Frameworks (MOFs) are a type of porous material that is widely applied in various fields, such as fuel purification, solvent recovery, gas storage, and adsorbents. Lead (II) is a heavy metal ion that can pollute the environment and endanger humans. This study aims to synthesize MOFs and apply it to the Pb2+ adsorption process. In this research, MOFs type Zn-BDC or MOF-5 were synthesized by sonochemistry method at 60 ℃ as adsorbent for Pb2+ ion. Characterization of the adsorbent by FTIR showed the presence of functional groups C=O, C-H, and Zn-O which indicated the formation of the MOF-5 compound. The concentrations of Pb2+ ions were analyzed using Atomic Absorption Spectrophotometer (AAS). The experimental results show the optimum conditions for the adsorption process at pH 5 for 60 minutes with adsorption efficiency reaching 93.41%. Testing the adsorption isotherm model showed that the Pb2+ ion adsorption process using Zn-BDC as an adsorbent followed the Langmuir isotherm model with the R2 value of 0.9986.
Pengaruh Konsentrasi Hidrolisat Kulit Pisang Raja Terhadap Produksi Biohidrogen Menggunakan Escherichia Coli Melalui Dark Fermentation Atqiyaa, Millatul; Fitriani, Ana; Keryanti; Ramadhani, Laily Isna
Prosiding Industrial Research Workshop and National Seminar Vol. 16 No. 1 (2025): Vol. 16 No. 1 (2025): Prosiding 16th Industrial Research Workshop and National
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v16i1.6680

Abstract

Biohidrogen merupakan sumber energi terbarukan yang dihasilkan melalui proses biologis dan berpotensi menjadi alternatif pengganti bahan bakar fosil. Penelitian ini bertujuan untuk memproduksi biohidrogen melalui proses dark fermentation dengan menggunakan hidrolisat kulit pisang raja sebagai substrat dan bakteri Escherichia coli sebagai inokulum. Kulit pisang raja dihidrolisis secara enzimatis menggunakan enzim α-amilase dan glukoamilase, menghasilkan gula pereduksi dalam hidrolisat sebesar 7,60% (b/v). Variasi konsentrasi hidrolisat terhadap volume media fermentasi yang digunakan dalam proses fermentasi adalah 20%, 30%, 40%, dan 50% (v/v) pada suhu 37 °C selama 7 hari. Hasil penelitian menunjukkan bahwa pertumbuhan mikroorganisme E. coli meningkat seiring dengan peningkatan konsentrasi hidrolisat, dengan berat sel kering tertinggi pada konsentrasi 50% yaitu sebesar 2,59 g/L. Volume gas tertinggi dihasilkan pada konsentrasi hidrolisat 30%, yaitu sebesar 12,56 mL. Namun, analisis menggunakan GC-TCD menunjukkan bahwa gas biohidrogen tidak terdeteksi pada hasil fermentasi semua variasi konsentrasi. Hal ini mengindikasikan perlunya optimasi lebih lanjut terhadap kondisi fermentasi, termasuk pengendalian pH dan pemilihan mikroorganisme yang lebih sesuai, untuk meningkatkan produksi biohidrogen.
Strategi Pengelolaan Bisnis Budidaya Maggot Black Soldier Fly (BSF) dalam Akselerasi Program Kampus Zero Waste: Studi Kasus Politeknik Negeri Bandung Dewi Amalia; Aceng Gima Sugiama; Yackob Astor; Harita Nurwahyu Chamidy; Keryanti; Ira Puspitasari
Journal of Innovative and Creativity Vol. 6 No. 1 (2026)
Publisher : Fakultas Ilmu Pendidikan Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/joecy.v6i1.7478

Abstract

Institusi pendidikan tinggi menghadapi tantangan signifikan dalam mengelola limbah organik. Studi ini mengevaluasi proyek percontohan budidaya larva lalat Black Soldier Fly (BSF) sebagai solusi ekonomi sirkular di Politeknik Negeri Bandung (POLBAN). Menggunakan pendekatan metode campuran konvergen paralel, penelitian ini menggabungkan data operasional kuantitatif dengan analisis pemangku kepentingan kualitatif. Hasil menunjukkan bahwa sistem mencapai indeks pengurangan limbah sebesar 90,07%, dengan pemrosesan limbah organik hingga 1,57 ton per bulan secara konsisten. Efisiensi produksi meningkat secara signifikan, dengan Rasio Konversi Pakan (FCR) turun dari 19,9:1 menjadi 2,7:1 dalam tiga bulan. Secara finansial, proyek ini mencapai kemandirian dalam pembibitan, dan menghilangkan biaya benih. Penelitian ini menyediakan peta jalan strategis untuk mengintegrasikan teknologi biokonversi ke dalam kebijakan pengelolaan limbah institusional.
Sintesis Carbon Nanodots dari Molase Menggunakan Metode Pemanasan Terbantukan Gelombang Mikro Hulupi, Mentik; Nabilah, Nida; Nabilah, Tiana Hasna; Keryanti, Keryanti; Abdilah, Fauzi
Equilibrium Journal of Chemical Engineering Vol 6, No 1 (2022): Volume 6, No 1 July 2022
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v6i1.61212

Abstract

ABSTRAK. Carbon nanodots (CNDs) merupakan nanomaterial yang berukuran dibawah 10 nm. CNDs memiliki keunggulan diantaranya yaitu fotostabilitas tinggi, biokompatibilitas baik, toksisitas yang rendah, mudah dibuat, dan ramah lingkungan. Sumber karbon yang digunakan berasal dari molase karena murah dan mudah didapat serta merupakan hasil samping dari pengolahan tebu. Pada penelitian ini digunakan metode pemanasan terbantukan gelombang mikro atau Microwave Assisted Extraction (MAE) yang memberikan hasil suspensi yang homogen, pemanasan efisien, dan waktu yang singkat. Waktu iradiasi mempengaruhi energi gap CNDs dari molase yang dihasilkan. Waktu yang optimum untuk sintesis CNDs dari molase menggunakan metode MAE yaitu selama 3 menit. Efek fluoresensi telah diamati untuk suspensi CNDs yang mengubah warna kuning menjadi warna biru dibawah sinar UV 366 nm. Karakterisasi menggunakan spektrofotometri UV-Vis menunjukan serapan maksimum CNDs dari molase pada panjang gelombang 255 nm dengan energi gap sebesar 4,55 eV.Kata kunci: Carbon Nanodots, Microwave, MolaseABSTRACT. Carbon nanodots (CNDs) are nanomaterials with a size below 10 nm. CNDs have advantages such as high photostability, good biocompatibility, low toxicity, easy to manufacture, and environmentally friendly. The carbon source used comes from molasses because it is cheap and easy to obtain and is a by-product of sugarcane processing. In this study, the Microwave Assisted Extraction (MAE) method was used which gave homogeneous suspension results, efficient heating, and short time. The irradiation time affects the energy gap of the CNDs of the molasses produced. The optimum time for the synthesis of CNDs from molasses using the MAE method is 3 minutes. Fluorescence effects have been observed for suspensions of CNDs which turn yellow to blue under 366 nm UV light. Characterization using UV-Vis spectrophotometry showed the maximum absorption of CNDs from molasses at a wavelength of 255 nm with an energy gap of 4.55 eV.Keywords: Carbon Nanodots, Microwave, Molasses 
Co-Authors Abdilah, Fauzi Aceng Gima Sugiama Ade Safaat Ahmad Faizal Ahmad, Zidni Zakiyyah Alifa Dewi Kirana Ambar Susanto, Ambar Anggraeni, Nani Anindya Indrita Putri Anwar Muhamad Rizki Ari Marlina Asih, Ria Puspa Atqiyaa, Millatul Azzahra, Rheisya Talitha Chamidy, Harita Nurwahyu Citra Noer Aqsha Citra Noer Aqsha Della Agustia Marhani Deni Ramdhani Deni Ramdhani Dewi Amalia Dewi Amalia Dewi, Widya Tresna Dhea Nurul Amalia Dini Nurcahya Dini Nurcahya Djatnika, Tjetjep Endang Kusumawati Fauzi Abdilah Fitriani, Ana Fitrianti, Yanis Ghinaa Annisa Khairani Gianistri Maulani Hariyadi, Tri Hasanah, Rizkiya Herawati Budastuti Herliana, Hanafiah Hidayah, Resti Nurul Ira Puspitasari Karina Aulia Rahmawati Manfaati, Rintis Mauludin, Luthfi Muhammad Mentik Hulupi Min, Joe Lian Muhamad Nur Rojab Muhammad Hafizh Nabilah, Nida Nabilah, Tiana Hasana Nabilah, Tiana Hasna Nida Nabilah Nurisa Salsabila Permanasari, Ayu Ratna Prans Connery Manurung PUDIN, APIP Putri Vina Amalia Rahmawati, Karina Aulia Ramadhani, Laily Isna Ratna Yulistya Ningrum Ratna Yulistya Ningrum Retno Indarti Rintis Manfaati Riski Harliyansyah Riski Harliyansyah Sarah Sarah Sihombing, Rony Pasonang Sri Harjati Suhardi Tiana Hasna Nabilah Tri Hariyadi Tri Hariyadi Trirahayu, Dhyna Analyes Widya Tresna Dewi Yackob Astor Yulistiani, Fitria Zahra Nur Salsabila