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All Journal Reaktor Jurnal Teknik Kimia Jurnal Fisika Unand Journal of Natural Sciences and Mathematics Research Konversi Jurnal Kimia Riset CHEESA: Chemical Engineering Research Articles International Journal of Economics, Business and Accounting Research (IJEBAR) Jurnal Inovasi Teknik Kimia 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 Altifani Penelitian dan Pengabdian kepada Masyarakat AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Pengbdian Teknik Mesin Journal Serambi Engineering (JSE) Algoritma: Jurnal Matematika, Ilmu Pengetahuan Alam, Kebumian dan Angkasa JURNAL REKAYASA KIMIA & LINGKUNGAN
SRIE MULJANI
Program Studi Teknik Kimia, Fakultas Teknik & Sains, Universitas Pembangun Nasional “Veteran” Jawa Timur, Surabaya
Religion 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 Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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KAJIAN ADSORPSI LOGAM CU DENGAN ADSORBEN SILIKA GEL Wisnu Adi Prasojo; Srie Muljani
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 2 No. 5 (2024): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v2i5.163

Abstract

Adsorption is a separation process on a particular substance based on the affinity of a compound to a solid. The adsorption process requires an adsorbent as an absorbent material and an adsorbate as an absorbed component. The adsorbent that is often used to absorb Cu2+ ions is silica gel. Silica gel is a rigid gel that is amorphous. In silica gel there are two main bonding groups, namely siloxane and silanol groups which cause silica gel to easily absorb polar molecules, especially water. The purpose of this research is to get the best mass of silica and the effect of the initial concentration of Cu ions on the final concentration of Cu metal. In this study, two operating conditions were varied, namely the mass of silica gel adsorbent 0.4 grams; 0.6 grams; 0.8 grams; 1 gram; 1.2 grams and the initial concentration of Cu metal 3 ppm; 4 ppm; 5 ppm; 6 ppm; 7 ppm. The results of this study showed that the silica content of bagasse ash was 70.97% with a surface area of 283.802 m2/g. The best result of this study reduced the content of copper metal (Cu) by 88% in the condition of silica gel mass of 1.2 grams. The adsorption isotherm shows that the data is more in line with the Freundlich equation. The resulting equation is y = 0.4268x + 0.4969 with an R2 value of 0.9837.
Precipitated calcium oxide nanosize from limestone and blood clam shells Pujiastuti, Caecilia -; Muljani, Srie; Sumada, Ketut
Journal of Natural Sciences and Mathematics Research Vol. 9 No. 1 (2023): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

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Abstract

Calcium oxide (CaO) is a product that is needed by various types of industries such as the pharmaceutical, chemical, agricultural and health industries. CaO is generally produced by the calcination method of CaCO3 materials such as calcium carbonate rocks or from various types of shells. The calcination method requires a large amount of energy because the operating temperature is above 1000 C and the resulting calcium oxide product is still micrometer size. This study developed nanosize precipitated CaO from two calcium sources, namely blood clam shells and limestone. For clam shells using hydrochloric acid as a solvent and sodium hydroxide as a precipitating agent, while for limestone using phosphoric acid as a solvent and potassium hydroxide as a precipitating agent. The effect of acidity (pH) and calcination temperature on the characteristics of the precipitated CaO was observed. The blood calm shell produces precipitated CaO 85-92 % with a particle size of 200-250 Nm and the limestone produces precipitated CaO 42-66% with a particle size of 250-300 Nm 
Development of a Spray Pipe Evaporator for Application on Unproductive Salt Farm Land in Indonesia Muljani, Srie; Sumada, Ketut; Pradana, Alfian Rizki; Pujiastuti, Caecilia
ASEAN Journal of Community Engagement Vol. 8, No. 2
Publisher : UI Scholars Hub

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Abstract

This article discusses the development of a prototype spray pipe evaporator and its efficiency in producing salt in Indonesia. Due to the length of the salt harvesting season in Indonesia, many salt farmers have closed their business doors, leaving many salt ponds abandoned. The spray pipe evaporator prototype was designed to produce a brine solution with a salinity of 23–24 Be from seawater, which has a salinity of 2.5–3.5 Be, in less than 3 days. This is faster than the conventional process of a brine solution salinity of 24 Be. The prototype spray pipe evaporator was assessed in a 20 x 60 m evaporation pool with a depth of 18 cm that contained brine solution with a salinity of 15.5 Be. The number of sprays installed was 11. The salinity increased from 15.5 Be to 20.5 Be after 8.5 hr of evaporation. Meanwhile, with conventional evaporation, the salinity of the brine solution reaches 16.5 Be after 3 days of evaporation. Based on calculations of the evaporation capacity for 11 sprays, it was determined that each spray can evaporate 7.6 m3 of water. A spray pipe evaporator is thus more recommended for evaporation of seawater with a salinity of around 3–5 Be. The ratio of evaporation ponds using spray to evaporation ponds without spray is around 1:15. The technical development conducted in this study improved the evaporation process through spraying, which is applicable for salt pond farming and the salt industry. This technology arguably saves energy for pumps and reduces the number of workers, thus benefitting the salt farmers’ communities in tropical contexts, such as Indonesia.
Synthesis of Aragonite Polymorphs from Five Types of Sea Shells by Carbonation Method Prasetyo Hadi; Wahyu Hidayah; Sani Sani; Srie Muljani
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i3.6998

Abstract

Shell waste accumulates along the coastal areas of Surabaya and Sidoarjo, with various types of shells including blood shells, green shells, feather shells, kampak shells, and batik shells. Currently, the waste from these shells is not being utilized optimally. Marine shell waste contains more than 95% calcium carbonate (CaCO3), making it suitable for the production of aragonite crystals, which can serve as raw materials for applications such as bone regeneration, paper manufacturing, and as fillers in rubber and plastics. The objective of this research is to synthesize aragonite from five types of marine shells and to investigate the effect of carbonation temperature on the percentage of aragonite formation. The method employed for synthesizing aragonite crystals is carbonation. Initially, the CaCO3 derived from marine shells is calcined at 900°C to produce calcium oxide (CaO). This calcium oxide is then dissolved in hydrochloric acid (HCl) to form calcium chloride (CaCl2). Subsequently, sodium hydroxide (NaOH) is added to CaCl2, and carbon dioxide (CO2) gas is bubbled through the solution to precipitate CaCO3 along with by-products of NaCl and water. The variables examined include comparisons among five types of shells (blood shells, green shells, feather shells, kampak shells, and batik shells) at calcination temperatures of 30°C, 60°C, and 90°C. The best results were obtained from the synthesis using green shells, yielding an aragonite crystal polymorph percentage of 76.4% at a carbonation temperature of 90°C. Conversely, the smallest yield of aragonite crystal polymorph was observed with batik shells at 26.0%.
Unveiling the role of cellulose solvent systems in direct and sustainable silica amination: a new pathway beyond aminopropyl agents Ajiz, Hendrix Abdul; Widiyastuti, Widiyastuti; Setyawan, Heru; Muljani, Srie; Suryandari, Ade Sonya; Erliyanti, Nove Kartika
Konversi Vol 14, No 2 (2025): OCTOBER 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i2.23610

Abstract

The functionalization of silica surfaces using sustainable amine sources is critical for advancing environmentally friendly materials in CO2 capture technologies. In this study, bio-based organosilanes derived from coconut fiber cellulose were explored as a green alternative to conventional aminosilane. Two solvent systems DMSO/NH4OH and NaOH/urea were utilized to dissolve and regenerate cellulose, enabling direct grafting onto silica surfaces. Comparative analysis revealed that while DMSO/NH4OH-dissolved cellulose exhibited a modest amine loading of 23.43% wt, comparable to aminopropyl-based modification (22.41% wt), the NaOH/urea system significantly improved the grafting efficiency, reaching 40.52% wt. This enhancement is attributed to urea’s amphiphilic properties, which facilitate both hydrophobic interactions and carbamate formation. The use of a sulfur-free NaOH/urea system not only improves performance but also aligns with green chemistry principles. These results demonstrate the potential of biomass-derived cellulose as a viable modifying agent for silica, paving the way for scalable, low-toxicity, and circular-economy-based material design strategies.
Pengolahan Limbah Cair Laundry Menggunakan Aluminium Sulfat dari Fly Ash dengan Metode Koagulasi - Flokulasi Adelita Sidabutar; Utami, Noni Esti; Srie Muljani; Caecillia Pujiastuti; Sani
Jurnal Serambi Engineering Vol. 11 No. 1 (2026): Januari 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Laundry wastewater poses thousand risk for the environment and microbes due to its detergent content that remain the same from washing process using detergent and any other substance. These detergents can trigger various issues such as eutrophication in rivers and health problems caused by their chemical components. Therefore, further treatment is necessary to ensure the wastewater meets quality standards and is safe for discharge into the environment. Fly ash, which contains a high concentration of aluminum, can be utilized through a synthesis process to produce alum. This alum is then applied in coagulation–flocculation processes to reduce pollutants in laundry wastewater, such as BOD, COD, and TSS. This study aims to determine the optimal dosage and contact time of fly ash alum in treating wastewater to meet quality standards, using dosage variations of 30, 40, 50, 60, and 70 mL and flocculation times of 45, 55, 65, 75, and 85 minutes. The results of the treatment using fly ash alum are then compared with those using commercial alum to identify the most effective treatment. Consequently, the synthesis and treatment process not only contribute to wastewater management but also offer an alternative solution for coagulant and flocculant materials.
Optimasi Konsentrasi HCl Dan Suhu Kalsinasi Terhadap Yield Produk MgCl2 Dari Bittern Annisa, Nur; Diah Nur Fitri Midayoga; Lilik Suprianti; Srie Muljani
Jurnal Serambi Engineering Vol. 11 No. 1 (2026): Januari 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

The brine solution remaining after salt crystallization contains high levels of valuable minerals, particularly magnesium, which can be extracted and processed into magnesium chloride (MgCl₂), a compound widely used in various industrial applications. This study examines the effect of hydrochloric acid (HCl) concentration and calcination temperature on the yield of MgCl₂ synthesized from brine-derived magnesium hydroxide. Magnesium hydroxide was precipitated using sodium hydroxide and subsequently reacted with HCl solutions of varying concentrations (1N–5N) before being calcined at temperatures ranging from 350°C to 550°C. The results show that both HCl concentration and calcination temperature significantly influence the product yield. The highest yield, 80.07%, was obtained at an HCl concentration of 4N and a calcination temperature of 550°C. While increasing acid concentration and temperature generally improved yield, concentrations above 4N did not provide further benefits and instead tended to decrease efficiency. These findings highlight key processing parameters for optimizing MgCl₂ production from brine, contributing to more efficient resource utilization and environmentally sustainable mineral processing practices.
Pengaruh ZnO-Karbon Aktif Terhadap Penurunan Cr(VI) Pada Air Limbah Batik Dengan Metode Fotokatalisis Iradiasi Sinar Tampak Anhar, Farhan Auladana Putra; Mirwan, Mohammad; Jawwad, Muhammad Abdus Salam; Muljani, Srie
Jurnal Serambi Engineering Vol. 11 No. 2 (2026): April 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Industri batik menghasilkan air limbah yang di dalamnya terkandung logam berat kromium heksavalen Cr(VI) dengan sifat toksik, karsinogenik, dan berbahaya bagi lingkungan perairan. Salah satu metode yang berpotensi efektif dan ramah lingkungan untuk menurunkan kadar Cr(VI) adalah fotokatalisis. Penelitian ini bertujuan untuk menganalisis pengaruh penggunaan komposit ZnO–karbon aktif dan massa katalis terhadap kinerja fotokatalisis dengan iradiasi sinar tampak dalam menurunkan kadar Cr(VI) pada air limbah batik. Variasi yang digunakan meliputi massa katalis sebesar 30 gram, 45 gram, dan 60 gram. Hasil penelitian menunjukkan bahwa penggunaan komposit ZnO-karbon aktif mampu meningkatkan efisiensi penurunan Cr(VI) dibandingkan ZnO tanpa modifikasi. Kombinasi kondisi optimal diperoleh pada penggunaan komposit ZnO - karbon aktif dengan massa terbesar dan waktu kontak terlama dengan efisiensi penyisihan sebesar 39%.
Kinetika Reaksi Pembentukan Kalium Fosfat dari K2O Berbahan Abu Tandan Kosong Kelapa Sawit dan Asam Fosfat Kamil, Ihsan; Mohammad Falahul Habibaini Nuruddin; Caecilia Pujiastuti; Srie Muljani; Sani
Jurnal Serambi Engineering Vol. 11 No. 2 (2026): April 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Tandan kosong kelapa sawit (TKKS) adalah jenis limbah padat yang didapatkan dari industri kelapa sawit dan masih memiliki potensi untuk dimanfaatkan kembali karena mengandung kalium dalam bentuk K₂O. Penelitian ini dilakukan untuk mempelajari kinetika reaksi pada proses pembentukan kalium fosfat dari K₂O berbahan abu TKKS dan asam fosfat. Tahap awal penelitian dilakukan dengan membakaran TKKS menjadi abu, kemudian dilakukan ekstraksi dengan aquadest. Larutan ekstrak abu kemudian direaksikan dengan asam fosfat pada labu leher tiga dengan variasi temperatur 60, 70, 80, 90, 100 °C serta waktu reaksi 30, 40, 50, 60, 70 menit dengan pengadukan 200 rpm. Produk yang dihasilkan dianalisis menggunakan uji spektrofotometri untuk mengetahui kandungan kalium. Hasil penelitian didapatkan konversi kalium tertinggi diperoleh pada temperatur 100 °C dan waktu reaksi 70 menit dengan nilai konversi sebesar 0,8788. Berdasarkan analisis kinetika reaksi, pembentukan kalium fosfat sesuai dengan orde satu dan konstanta laju reaksi terbesar sebesar 0,0165 menit⁻¹ saat temperatur 100 °C. Perhitungan menggunakan persamaan Arrhenius menghasilkan energi aktivasi yaitu 442,421 J/mol dan faktor frekuensi tumbukan sebesar 0,0289.
Sintesis dan Karakterisasi Hidroksiapatit dari Cangkang Kepiting dengan Metode Sol Gel Dwipayanti, Juvita Retno; Yuani Firanita; Srie Muljani
Jurnal Serambi Engineering Vol. 11 No. 2 (2026): April 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Penelitian ini bertujuan untuk mensintesis dan mengkarakterisasi hidroksiapatit dari limbah cangkang kepiting menggunakan metode sol-gel serta mengetahui pengaruh pH dan suhu sintering terhadap hasil yang diperoleh. Cangkang kepiting dimanfaatkan sebagai sumber kalsium karena memiliki kandungan CaCO₃ yang tinggi dan berpotensi sebagai bahan baku ramah lingkungan. Variasi pH 7–11 dan suhu sintering 400–800°C digunakan dalam proses sintesis. Hasil penelitian menunjukkan bahwa yield hidroksiapatit berada pada rentang 51–65%. Analisis XRF menunjukkan kondisi terbaik pada pH 7 dan suhu sintering 800°C dengan rasio Ca/P sebesar 2,67, dimana nilai tersebut masih lebih tinggi dari standar 1,67 yang diduga disebabkan oleh tingginya kandungan kalsium dan adanya ion Mg²⁺. Analisis XRD menunjukkan bahwa hidroksiapatit telah terbentuk namun belum sepenuhnya murni karena masih terdapat fase sekunder berupa Calcium Magnesium Hydrogen Phosphate, meskipun beberapa puncak difraksi telah sesuai dengan pola standar hidroksiapatit. Penelitian ini menunjukkan bahwa limbah cangkang kepiting berpotensi sebagai bahan baku hidroksiapatit dengan pengendalian kondisi proses yang tepat.
Co-Authors A.R Yelvia Sunarti Abdullah, Affan Zein Adelita Sidabutar Agustina, Meri Aisyah Alifatul Zahidah Rohmah Ajiz, Hendrix Abdul Amalia, Ayu Rizka Amelia Putri Kusherawati Anggelina, Efline Anggoro, Achmad Rahditya Viman Anhar, Farhan Auladana Putra AR Yelvia Sunarti ari, Citra Yulia S Arianti, Rahma Dea Rerindra Astuti, Dwi Hery Bambang Wahyudi Bambang Wahyudi Wahyudi Caecilia - Pujiastuti Caecilia Pujiastuti Caecilia Pujiastuti Caecillia Pujiastuti Cahyo, Mei Syella Kurnia Putri Candra, Adi Clareta Rahmawati Maudy Damayanti, Savira Farizqy Darma, Apriandi Putra Diah Nur Fitri Midayoga Dwi Hery Astuti Dwipayanti, Juvita Retno Dyah Suci Perwitasari Erliyanti, Nove Kartika Erwan Adi Saputro Faiqoh, Iklimatul Farida Pulansari Heru Setyawan Indah Dwi Wahyuningsih ISNI UTAMI Isni Utami J.E. Sutanto Jawwad, Muhammad Abdus Salam JE Sutanto Kamil, Ihsan Ketut Sumada Kindriari Nurma Wahyusi Kusuma, Kurnia Arifiani L.Urip Widodo, Yohandrik Novel Karaman Luluk Edahwati Maharani, Eka Ferdinda Putri Ayu Matovanni, Maudy Pratiwi Novia Maulana, Mochamad Titus Mega Rosilina Mega Rosilina Mirwan, Mohammad Moch Iqbal Darmawan Mochamad Titus Maulana Mochamad Titus Maulana Mohammad Falahul Habibaini Nuruddin Mu’tasim Billah Nana Dyah Siswati, Anwar Zain and Mohammad Nicander, Priscillia stevanies Nofitasari, Luluk Novanto, Satria Agung Nove Kartika Noviardyanti, Fara Zabrina Nur Annisa Nur Hapsari Pamoedji, Yemima Natalia Eka Kristiyanti Pangestu, Titan Obby Pertiwi, Beta Cahaya Pradana, Alfian Rizki Prasetyo Hadi Prasetyo, Muhammad Dewa Pujiastuti, Caecilia Pujiastuti, Caecilia Pujiastuti, Caecilia Pujiastuti, Caecilia Pujiastuti, Caecilia - Putri, Alisyah Ananda Ramadhan, Mochamad Rafli Reva Edra Nugraha Rifaldi, Kornelius Rosilina, Mega S Suprihatin Sani Sani Sari, Amilia Putri Puspita Shofiyah Silviya Nur Ridha Sintha Soraya Santi Sri Redjeki Sukirmayadi Sukirmayadi Sunarti, A.R Yelvia Suprianti, Lilik Suprihatin Suryandari, Ade Sonya Susilowati sutiyono sutiyono Syis Muhim Titi Susilowati Tri Widjaja Utami, Noni Esti Verbiawan, Erza Anggara Wahyu Hidayah Widiyastuti Widiyastuti Widyaningrum, Nilam Putri Wiraya, Wira Arta Wisnu Adi Prasojo Yuani Firanita Yulia S, Putri Arysanti