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All Journal Reaktor Jurnal Teknik Kimia Jurnal Fisika Unand Journal of Natural Sciences and Mathematics Research CHEESA: Chemical Engineering Research Articles International Journal of Economics, Business and Accounting Research (IJEBAR) ASEAN Journal of Community Engagement G-Tech : Jurnal Teknologi Terapan Nusantara Science and Technology Proceedings International Journal of Eco-Innovation in Science and Engineering (IJEISE) Jurnal Pengbdian Teknik Mesin Serambi Engineering JURNAL REKAYASA KIMIA & LINGKUNGAN
SRIE MULJANI
Universitas Pembangunan Nasional Veteran Jawa Timur
Agriculture, Biological Sciences & Forestry Humanities 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 Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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Journal : Reaktor

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Synthesis of Matrix Si-K-HAs Gel from Geothermal Sludge and Peat Srie Muljani; Bambang Wahyudi Wahyudi; S Suprihatin; Ketut Sumada
Reaktor Volume 18 No. 2 June 2018
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4869.103 KB) | DOI: 10.14710/reaktor.18.2.76-83

Abstract

The synthesis of matrix silica-potassium-humic acid gel (Si-K-HAs) has been performed successfully by gradual extraction and acidification method. The extraction was carried out in two stages: 1) extraction of humic substances from peat prepared by potassium hydroxide to produce potassium humate (K-HAS) solution, 2) extraction silica from geothermal sludge using K-HAs solution to produce Si-K-HAs solution. Acidification of Si-K-HAs solution prepared by citric acid (1-3N) to produce matrix gel of Si-K-HAs. The Si-K-HAs matrix gel products are characterized by Fourier Transform InfraRed (FTIR), X-ray fluroscence (XRF), and Brunauer–Emmett–Teller (BET) analysis. The acidification process was carried out in neutral to acid (pH 3-7) conditions and the results showed that at neutral pH no Si-K-HAs gel formed. IR spectra confirmed the presence of humic acid in the gel product, whereas XRF analysis confirmed the presence of potassium (K) and silica (SiO2) in the gel product. The molar ratio of SiO2:K2O in the product is 0.9 - 0.3 in the pH range of 3-5. Si-K-HAs powder can be used as soil fertilizer especially for soils that lack silica, humic, and potassium nutrients or for future application development. Keywords: gradual extraction; geothermal sludge; matrix gel; humic substance
Transformation of Calcium Carbonate Polymorph From Various Type of Shells by Carbonation Methods Srie Muljani; Erwan Adi Saputra; Ketut Sumada
Reaktor Volume 21 No. 1 March 2021
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1446.366 KB) | DOI: 10.14710/reaktor.21.1.27-34

Abstract

The utilization of shells can reduce the accumulation of shell wastes and increase the value of shells to achieve ecological and economic incentives. This study examines the transformation of calcium carbonate polymorph from several types of shells to understand the causes of their characteristics in order to suitable for their use. The types of shells used in this experiment are selected based on consumable and their habitats such as snail shells, crab shells, eggshells, batik mussels shells, and golden conch shells. The prepared shells calcinate at 900 °C, the reaction with hydrochloric acid, and carbonation by flowing CO2 into a stirred reactor to produce precipitated CaCO3. The characteristics of polymorph CaCO3  in the sintering temperature of 30, 50, and 70 ℃ were identified by XRD, FTIR, and SEM morphological. The result is that the polymorphs formed from each shell are different in shape, size, and crystallinity. At the temperature of 70 ℃, the rhombohedral calcite was obtained from snail shells, the cubic calcite was obtained from batik mussel shell, while rhombohedral calcite multilayers obtained (100%) from golden conch shells. The aragonite was obtained from batik mussel shells at 30 and 70 ℃. The pure vaterite (100%) was obtained from snail shells and crab shells at 50 ℃. The characteristic of polymorph formed might be useful as information for more suitable applications, especially as nano-bio materials, optical, or filler
Co-Authors A. R Yelvia Sunarti Abdullah, Affan Zein Amalia, Ayu Rizka Anggoro, Achmad Rahditya Viman Arianti, Rahma Dea Rerindra Astuti, Dwi Hery Bambang Wahyudi Bambang Wahyudi Wahyudi Caecilia - Pujiastuti Damayanti, Savira Farizqy Darma, Apriandi Putra Erwan Adi Saputro Farida Pulansari Hidayah, Wahyu ISNI UTAMI J.E. Sutanto JE Sutanto Ketut Sumada Caecillia Pujiastuti Kindriari Nurma Wahyusi Kusuma, Kurnia Arifiani L.Urip Widodo, Yohandrik Novel Karaman Luluk Edahwati Maulana, Mochamad Titus Mega Rosilina Mochamad Titus Maulana Nana Dyah Siswati, Anwar Zain and Mohammad Nicander, Priscillia stevanies Nofitasari, Luluk Nove Kartika Nugraha, Reva Edra Nur Hapsari Pangestu, Titan Obby Pradana, Alfian Rizki Prasetyo Hadi Prasetyo, Muhammad Dewa Pujiastuti, Caecilia Pujiastuti, Caecilia - Putri, Alisyah Ananda Rifaldi, Kornelius Rosilina, Mega S Suprihatin Sani Sani SANI SANI Santi, Sintha Soraya Sari, Amilia Putri Puspita Sintha Soraya Santi Sukirmayadi Sukirmayadi Sunarti, A.R Yelvia Suprihatin sutiyono sutiyono Titi Susilowati Wiraya, Wira Arta