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S Suprihatin
Chemical Enggineering Department, Faculty Of Engineering, Universitas Pembangunan Nasional “Veteran” Surabaya, East Java, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering 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 Physics Transportation Other

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KINETICS STUDY OF AMMONIUM SULFATE FORMATION FROM BLEACHING EARTH INDUSTRIAL WASTEWATER USING AMMONIUM HYDROXIDE Yusup Fatkhul Mu’is; Andi Safira Larasati Syamhari; Caecilia Pujiastuti; Silvana Dwi Nurherdiana; Suprihatin Suprihatin
JURNAL INTEGRASI PROSES Vol 15, No 1 (2026)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v15i1.39320

Abstract

The increasing generation of sulfuric acid-rich liquid waste from bleaching earth activation poses significant environmental concerns due to its high acidity and potential ecological impact. This study presents a kinetic analysis of ammonium sulfate formation from bleaching earth waste, which has not been widely reported, particularly regarding the determination of reaction orders and activation energy. The reaction was carried out by neutralization with ammonium hydroxide, with no variation in reactant concentration. Experiments were conducted by varying the reaction time (5–25 minutes) and temperature (30–70 °C) to evaluate their effects on the reaction rate. Kinetic analysis was performed by testing zero-, first-, and second-order models using linear regression in Microsoft Excel. The results indicate that the first-order model best represents the experimental data, with R² values ranging from 0.97 to 0.99. The Arrhenius plot of ln k versus 1/T showed a linear relationship with R² = 0.9826, yielding an activation energy (Ea) of 10.611 kJ/mol. The rate constant (k) increased with temperature, confirming the temperature dependence of the reaction. The maximum sulfuric acid conversion achieved was 94.54% at 70 °C and 25 minutes. These findings demonstrate that the developed kinetic model provides a reliable basis for reactor design and process scale-up. The results highlight the potential of converting sulfuric acid waste into value-added ammonium sulfate, contributing to sustainable and economically viable waste management practices.
EFEKTIVITAS EDIBLE COATING BERBASIS PATI BIJI DURIAN (DURIO ZIBETHINUS) DAN KITOSAN UNTUK MEMPERPANJANG DAYA SIMPAN BUAH ANGGUR, STROBERI, DAN JAMBU AIR Ahmad Naufal Setya Fath Hajar; Desrika Nadzifa Ariyanto; Nurul Widji Triana; Susilowati Susilowati; Suprihatin Suprihatin
JURNAL INTEGRASI PROSES Vol 15, No 1 (2026)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v15i1.39365

Abstract

Rendahnya daya simpan buah lokal yang menyebabkan tingginya kerusakan pascapanen sehingga diperlukan upaya untuk mempertahankan kualitas buah. Pati biji durian yang memiliki kandungan pati sebesar 76,65% berpotensi dimanfaatkan sebagai bahan dasar edible coating. Penelitian ini bertujuan untuk menganalisis pengaruh edible coating berbasis pati biji durian, kitosan, dan gliserol terhadap daya simpan buah. Penelitian dilakukan secara eksperimental dengan variasi berat kitosan (0,5–2,5 g) dan pati biji durian (1–5 g), sedangkan gliserol digunakan sebanyak 5 mL pada semua formulasi. Larutan edible coating diaplikasikan pada buah anggur, stroberi, dan jambu air yang disimpan pada suhu ruang. Parameter yang dianalisis meliputi viskositas, pH, susut bobot buah, serta gugus fungsi menggunakan Fourier Transform Infrared Spectroscopy (FTIR). Hasil penelitian menunjukkan bahwa edible coating mampu menekan susut bobot buah selama penyimpanan. Pada buah anggur diperoleh susut bobot sebesar 25,443% dengan masa simpan 17 hari, sedangkan pada buah stroberi dan jambu air diperoleh susut bobot terendah masing-masing sebesar 21,154% dan 9,718% dengan masa simpan hingga 2 hari. Edible coating yang dihasilkan memiliki viskositas sekitar 2,7382–182,6809 cP dan pH 3–4. Analisis FTIR menunjukkan adanya gugus fungsi O-H, N-H, dan C=O yang mengindikasikan adanya interaksi antara pati, kitosan, dan gliserol. Penerapan edible coating mampu menghambat perpindahan uap air dan menekan laju respirasi sehingga susut bobot lebih rendah dan daya simpan menjadi lebih lama. Dengan demikian, edible coating berbasis pati biji durian berpotensi digunakan sebagai pelapis pascapanen guna mempertahankan kualitas dan masa simpan buah.
PEMBUATAN PUPUK ORGANIK PADAT BERBASIS KULIT DURIAN DAN STARDEC DENGAN METODE COMPOSTING AEROB Suprihatin; Radithya Bagus Sulistya; Jevanya Nathanael Silalahi
Jurnal Inovasi Teknik Kimia Vol. 10 No. 3 (2025): July | INTEKA - Jurnal Inovasi Teknik Kimia
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v10i3.15018

Abstract

This study aims to examine the effects of Stardec bioactivator dosage and composting time on the nutrient quality of solid organic fertilizer derived from durian peel waste. The method employed was aerobic composting using an in-vessel system with variations in Stardec dosage and composting duration. The results showed that increasing the Stardec dosage and composting period significantly enhanced the macronutrient content. The optimal condition was achieved by adding 15 grams of Stardec on the 15th day, resulting in organic carbon of 26.29%, total nitrogen of 4.76%, total phosphorus (P-total) of 3.97%, and total potassium (K-total) of 4.43%. The resulting C/N ratio ranged between 5–10, indicating good compost maturity and readiness for soil application. All final parameters, including pH and moisture content, complied with the quality standards of SNI 7763-2024, confirming that the product is suitable for use as a safe and nutrient-rich organic fertilizer for soil improvement.
Kalsium Karbonat Presipitat dari Cangkang Telur dengan Menggunakan Metode Indirect Carbonation Satryo Arya Prakoso; Therarinda Athayya Novalia Putri Irwansyah; Ely Kurniati; Suprihatin; Nurul Widji Triana
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini bertujuan untuk mensintesis dan mengkarakterisasi Precipitated Calcium Carbonate (PCC) dari limbah cangkang telur ayam menggunakan metode indirect carbonation. Cangkang telur dikalsinasi pada suhu 900oC selama 3 jam untuk menghasilkan CaO, kemudian dilarutkan dalam larutan HNO3 2M sebagai sumber ion kalsium. Proses karbonasi dilakukan menggunakan NH4HCO3 sebagai agen presipitasi dengan variasi konsentrasi 1,0 - 3,0M dan pH 8 - 12 untuk memperoleh kondisi optimum pembentukan PCC. Hasil analisis XRF menunjukkan bahwa bahan baku memiliki kandungan kalsium sebesar 98,95%, sehingga berpotensi sebagai sumber kalsium alternatif. Yield PCC tertinggi sebesar 69,8415% diperoleh pada kondisi pH 12 dan konsentrasi NH4HCO3 1,5M. Karakterisasi XRD mengonfirmasi terbentuknya fase kalsit yang dominan dengan puncak difraksi utama pada sudut 2θ sekitar 29,4°, sedangkan hasil SEM menunjukkan morfologi partikel berbentuk rhombohedral yang khas untuk kalsit. Hasil penelitian ini menunjukkan bahwa limbah cangkang telur berpotensi dimanfaatkan sebagai bahan baku ramah lingkungan dalam produksi PCC berkualitas tinggi untuk berbagai aplikasi industri.
Synthesis of Avocado Seeds Into Biodiesel Using A Catalyst CaO From Blood Cockle Shell Suprihatin; Alif Julian; Muhammad Fikri
Advance Sustainable Science Engineering and Technology Vol. 6 No. 4 (2024): August-October
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v6i4.779

Abstract

Biodiesel is an environmentally friendly fuel made from oil vegetables that contain triglycerides. Biodiesel from avocado seed vegetable oil in Indonesian agricultural areas which according to BPS 2022 data, Indonesia produces 183,000 tons of avocados per year. This research aims to gained the effect of adding reaction temperature and Oil : Methanol ratio influence on biodiesel production. The avocado seed oil obtained by soxhlet extraction method, where 50 gram avocado seeds powder extracted with n-hexane solvent in 1 hour extraction time and 60℃ temperature giving result 10% yield of avocado seed oil . The CaO catalyst are obtained from Calcination procees of blood cockle shells in 900℃ temperature and 4 hours calcination time giving 98.82% CaO Cotent. The biodiesel is produces with 97% methanol reactant and 98.82% CaO catalyst in various methanol volume (30; 40; 50; 60; and 70 ml) and under different temperature conditions (30; 40, 50, 60, and 70 ℃). The best result of transesterification process biodiesel is obtained in 50℃ and 40ml methanol gets biodiesel yield of 96%, methyl ester content of 99.83%,  density of 865 gr/cm3, viscosity of 2.5 cSt  , mgKOH/gr acid number of 0.56 of, and heating value of 9871.6 kcal/kg. Based on the high result of methyl ester content and heating value of biodiesel obtained from the procees, the avocado seed oil biodiesel potentially used as an sustainable energy.
Co-Authors Adinda Putri Cahyani Adji, Nafisa Tera Lintang Ahmad Naufal Setya Fath Hajar Alia Febrianti Muliina Alif Julian Andi Safira Larasati Syamhari AR Yelvia Bambang Wahyudi Wahyudi Caecilia Pujiastuti Caecilia Pujiastuti Caecillia P udjiastuti Desrika Nadzifa Ariyanto Dona Avrilia Kristanti Dwi Ayu Febrianti Ely Kurniati Erwan Adi Saputro Fidela Lathifa Haryati Halim, Muhammad Dani Ika Nawang Puspitawati Ima Putriana Jevanya Nathanael Silalahi Karangan, Adam Ketut Sumada Kindriari Nurma Wahyusi Krisna Kumara Dewa L Edahwati Labib, Ahmad Nauval Lucytasari, Silvia Dyah Meiska Dyah Meutia Familya Mohamad Nabhan Putra Redian Mohammad Iqbal Mr. Sutiyono Muhammad Fikri Muhammad Hilmi Marzuqi Muhimatur Rosida Muliawan, Alvin Rizky Mutasim Billah Nana Roudlotul Fitri Nandini , Atika Novel Karaman Nur Aini Fauziyah Nur Aini Fauziyah Nurul Widji Triana Nurul Widji Triana Puspa Prima Andini Putri Sinta Dewi Sinaga Radithya Bagus Sulistya Ramjani, Muhammad Rifki Retno Dewati Sani Satryo Arya Prakoso Selvia Sofi Yanti Septiyafani, Ayu Silvana Dwi Nurherdiana Silviana Ariana Sintha Soraya Santi Siswati, Nana Dyah Sri Muljani SRIE MULJANI Suprianti, Lilik Susilowati Susilowati Susilowati Therarinda Athayya Novalia Putri Irwansyah Trianna, Nurul Widji Yusup Fatkhul Mu’is