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Retno Dewati
Department Of Chemical Engineering, Faculty Of Engineering, Universitas Pembangunan Nasional “Veteran” Jawa Timur (UPN), Gunung Anyar, Surabaya 60294, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Other

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SINTESIS KARBON AKTIF DARI SHORT FLAMING COAL LOKAL INDONESIA DENGAN AKTIVATOR KOH SEBAGAI ADSORBEN Yonathan Juanto; Izam Arrazhi; Retno Dewati; Sani Sani
JURNAL INTEGRASI PROSES Vol 13, No 2 (2024)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v13i2.26997

Abstract

Batu bara merupakan batuan organik yang terbentuk dari fosil tumbuhan yang berwarna gelap dan terasosiasi oleh kandungan mineral seperti abu dan belerang. Ada 3 tingkatan yang terdapat dalam batu bara antara lain lignit, bituminus, dan antrasit. Antrasit merupakan jenis batu bara terbaik dikarenakan memiliki kandungan karbon terbesar diantara ketiganya, untuk itu pada penelitian ini digunakan batu bara jenis Antrasit. Kandungan karbon yang terdapat pada batu bara dapat dimanfaatkan untuk menjadi karbon aktif yang berfungsi sebagai adsorben. Metode yang digunakan yaitu gabungan antara metode fisika dan kimia, dimulai dengan proses dehidrasi, karbonisasi, dan aktivasi. Hasil yang didapatkan ialah rasio penggunaan KOH dan suhu optimum terbaik untuk mengaktivasi batu bara antrasit ada pada perbandingan batu bara terhadap KOH 1:5 pada suhu 700°C dengan kadar air sebesar 9,9%, kadar abu sebesar 9,9%, kadar zat terbang sebesar 13%, kadar karbon terikat sebesar 77,1%, serapan iodin sebesar 1040,58 mg/g, dan luas permukaan sebesar 317,328 m2/g.
Penelitian Pupuk Biofertilizer Berbahan dasar Kulit Buah Nanas dan Abu Rumput Gajah dengan pengaruh Berat bahan dan Durasi fermentasi Dian Pratiwi Tejo Kusumo; Dimas Arnanda; Kindriari Nurma Wahyusi; Dyah Suci Perwitasari; Retno Dewati
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.6013

Abstract

This research develops a biofertilizer production method using pineapple peel waste and elephant grass ash as raw materials. Pineapple peel contains nutrients that can improve soil fertility, while elephant grass, commonly used as livestock feed, has high silica content beneficial to the soil when used as fertilizer. The research aimed to produce a biofertilizer and examine the effects of material weight and fermentation duration on the levels of Nitrogen (N), Phosphorus (P), and Potassium (K), assessing whether the results meet Indonesian National Standard (SNI) fertilizer requirements. The fermentation process lasted approximately 35 days. The fermented biofertilizer was analyzed using the Micro Kjeldahl method for Nitrogen, UV-Vis Spectrophotometry for Phosphorus, and Atomic Absorption Spectrophotometry (AAS) for Potassium. The results showed the highest concentrations of Nitrogen (2.98%), Phosphorus (2.43%), and Potassium (3.39%) were obtained using 40 grams of elephant grass ash and 35 days of fermentation. The analysis indicated that increasing the amount of elephant grass ash and the fermentation duration resulted in higher N, P, and K levels. These findings align with SNI fertilizer standards, highlighting the potential of using sustainable and easily accessible materials to enhance organic fertilizer production efficiency.
Effectiveness of Activated Carbon from Jackfruit Skin for The Heavy Metal Lead (Pb) Adsorption Using The Langmuir and Freundlich Equations Nadya Ramadhani Arke; Dewa Ayu Made Dearwita Sari; Retno Dewati
Equilibrium Journal of Chemical Engineering Vol 8, No 1 (2024): Volume 8, No 1 July 2024
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v8i1.86765

Abstract

Activated carbon is a commonly used medium for adsorption to combat environmental pollution in both water and air. It is produced from plant or plantation waste containing carbon. Jackfruit skin, often considered as plantation waste, contains lignocellulosic compounds and has the potential to be used as active carbon. Activated carbon from jackfruit skin has a good absorption capacity and can absorb heavy metal waste such as lead (Pb). A recent study aimed to evaluate the absorption effectiveness of active carbon from jackfruit skin. The process involved making activated carbon using the pyrolysis method, and then analyzing its lead absorption capacity in lead nitrate solution by varying the weight of the activated carbon (10g, 15g, 20g, 25g, 30g) and the adsorption time in minutes (40, 60, 80, 100, 120). The levels of absorbed lead on activated carbon were tested using Atomic Absorption Spectrophotometry (AAS) at a wavelength of 283.3 nm. The research findings indicate that the effectiveness of activated carbon absorption reaches 99%, and the appropriate equation model for the adsorption process is the Freundlich isotherm, indicating a multilayer adsorption process.Keywords:Adsorption Isotherm, Activated Carbon Jackfruit Skin, Lead (Pb)
PENENTUAN KONDISI TERBAIK PENYISIHAN ION Ca2+ DAN Mg2+ DARI AIR LAUT MENGGUNAKAN NATRIUM KARBONAT (Na2CO3) DAN AMONIUM HIDROKSIDA (NH4OH) Septianingsih, Dilla; Zulianti, Mei Fifa; Dewati, Retno; Sani, Sani
JURNAL INTEGRASI PROSES Vol 14, No 1 (2025)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v14i1.32090

Abstract

Air laut mengandung beragam ion logam, terutama ion kalsium (Ca2+) dan magnesium (Mg2+) yang menyebabkan masalah di berbagai industri, seperti pembentukan kerak pada peralatan industri dan pengolahan air minum.  Penelitian ini bertujuan untuk menentukan kondisi terbaik dalam penghilangan ion Ca2+ dan Mg2+ menggunakan Na₂CO₃ sebagai agen pengikat kalsium dan magnesium dan penambahan NH4OH sebagai bahan pengikat magnesium pada tahap kedua. Proses penghilangan dilakukan melalui reaksi pengendapan dengan variasi konsentrasi Na₂CO₃ yaitu 0,1, 0,2, 0,3, 0,4, dan 0,5 M, serta suhu operasi 30, 45, 60, 75, dan 90 °C. Waktu pengadukan ditetapkan selama 5 menit, diikuti dengan pengendapan selama 1 jam. Konsentrasi NH4OH ditetapkan pada 6,49 M berdasarkan hasil perhitungan stoikiometri. Kadar ion Ca²⁺ dan Mg²⁺ sebelum dilakukan perlakuan dan sesudah perlakuan dianalisis menggunakan metode titrasi kompleksometri dan atomic absorption spectrometry (AAS). Hasil penelitian menunjukkan bahwa peningkatan konsentrasi Na₂CO₃ dan suhu operasi berbanding lurus dengan persen penyisihan ion Ca²⁺ dan Mg²⁺. Analisis statistik menggunakan ANOVA dua arah juga menunjukkan nilai p < 0,05. Kondisi terbaik didapatkan pada penambahan natrium karbonat pada konsentrasi 0,5 M dan suhu 90 °C, dengan persen penyisihan  ion Ca²⁺ mencapai 97,85% dan ion Mg²⁺ sebesar 96,91%. Hasil penyisihan tersebut belum memenuhi standar SNI, karena kadar ion Ca2+ dan ion Mg2+ didapatkan sebesar 180,351 mg/L dan 182,288 mg/L, sedangkan standar SNI pada air minum kadar Ca2+ sebesar 10 mg/L dan kadar Mg2+ sebesar 150 mg/L. Penelitian ini mendukung pengembangan pra-pengolahan air laut yang lebih efisien dengan menurunkan kadar ion Ca²⁺ dan Mg²⁺ dalam industri air minum.
Effect of Temperature and Cellulose Mol Ratio on the Optimization of Oxalic Acid Production from Kapok Fiber Akren Alvindo Pratama; Shofwatul Athiyah; Retno Dewati
G-Tech: Jurnal Teknologi Terapan Vol 9 No 2 (2025): G-Tech, Vol. 9 No. 2 April 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i2.6628

Abstract

Until now, kapok fiber has not been fully utilized. However, kapok fiber has a high cellulose content that can be used as a basic material in the manufacture of oxalic acid. The purpose of this study was to determine how the hydrolysis temperature and the number of moles of cellulose affect the oxalic acid content produced from kapok fiber. This research was conducted in four stages, namely hydrolysis, precipitation, acidification, and crystallization. Oxalic acid crystals were then analyzed using permanganometric titration to determine the levels contained, melting point analysis, and pH to compare the characteristics of the synthesized oxalic acid with standard oxalic acid. In addition, FTIR spectroscopy analysis to determine the functional groups contained in oxalic acid. The results showed that the highest oxalic acid content was obtained in the condition of 1 mole cellulose and 70°C hydrolysis temperature, which amounted to 17.45%. The FTIR analysis results of synthetic oxalic acid and standard oxalic acid show similarities, as seen from the O-H group length of 3406.29 cm⁻¹, the C=O group length of 1687.71 cm⁻¹, the C-O group length of 1132.21 cm⁻¹, and the C-H group length of 669.30 cm⁻¹.
Co-Authors Akren Alvindo Pratama Alrista Rahmawati Andarista, Fanny Feby Ardika Nurmawati Dewa Ayu Made Dearwita Sari Dian Pratiwi Tejo Kusumo Dimas Arnanda Dimas Nur Arifianto Disty Nur Rohmah Dyah Suci Perwitasari Dzaky, Muhammad Milzam Faisal Amri Sholahuddin Faqih Sembada Wijayatin Farhah Kamilatun Nuha Fioni Ashari Putri Huda, Mukhammad Miftakhul Izam Arrazhi Jauhar Hilmy Ketut Sumada Kindriari Nurma Wahyusi Kindriari Nurma Wahyusi Meutia Familya Mu’tassim Billah Nadya Ramadhani Arke Rabani, Bagus Ibnu Hiban Rasendriya Renova Panjaitan S Suprihatin Sani Septianingsih, Dilla Setiawan, Jainnul Shofwatul Athiyah Silviana Ariana Sri Muljani Sunarti, AR Yelvia Windhono, Firman Yonathan Juanto Zulianti, Mei Fifa