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All Journal Jurnal Rekayasa Proses JURNAL KIMIA SAINS DAN APLIKASI Research Report - Engineering Science Jurnal Pendidikan Indonesia JIKSI (Jurnal Ilmu Komputer dan Sistem Informasi) Seminar Nasional Teknik Kimia Kejuangan JURNAL INTEGRASI PROSES JPS Unimus JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Indonesian Journal of Chemistry Jurnal Rekayasa Proses Journal of Multidisciplinary Applied Natural Science INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY Jurnal Rekayasa Proses Jurnal Teknik Kimia
Kristianto, Hans
Parahyangan Catholic University
Agriculture, Biological Sciences & Forestry Arts 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 Education Energy Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Carbon composite of NiO hydrothermal impregnation from sugarcane bagasse and its electrochemical properties Nasti, Al Nadine De; Siburian, Kyfti Yolanda; Sembiring, Abraham Danofan; Kristianto, Hans; Susanti, Ratna Frida; Oktaviano, Haryo Satriya; Nugroho, Agung
Jurnal Rekayasa Proses Vol 17 No 2 (2023): Volume 17, Number 2, 2023
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.88210

Abstract

Sugarcane bagasse (SB) can synthesize activated carbon (AC) through a two-step calcination process at calcination at 400oC and activation at 800oC. NaOH 0.1 M is used to activate the pre-carbonized sample in the activation step. The AC samples undergo hydrothermal impregnation with nickel oxide (NiO) at 110°C. The X-ray diffraction (XRD) pattern and Energy dispersive X-ray spectroscopy (EDX) confirmed the presence of NiO after this process. Scanning Electron Microscope (SEM) indicates the presence of pore structures in the sample morphology. A three-electrode system with 1 M Na2SO4 as an electrolyte was employed to assess the electrochemical properties. The specific capacitance for activated carbon derived from SB stands at 89.53 F/g at 0.05 A/g current density, while after impregnation with NiO, it increases to 250.53 F/g at the same current density. The results demonstrate the possibility of activated carbon from sugarcane bagasse waste composited with NiO as supercapacitor electrodes.
Alginate as A Natural Coagulant-Aid: Advances, Challenges, and Applications Kristianto, Hans; Prasetyo, Susiana; Sugih, Asaf Kleopas
Journal of Multidisciplinary Applied Natural Science Articles in Press
Publisher : Pandawa Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47352/jmans.2774-3047.287

Abstract

Coagulation is a critical step in water and wastewater treatments that is essential for the removal of suspended solids, organic matters, and colloidal particles. Conventional metal-based coagulants such as aluminium sulphate, ferric chloride, and polyaluminium chloride and synthetic polymer such as polyacrylamide are widely used due to their proven efficiency. However, concerns over their environmental impact, including the generation of non-biodegradable sludge, potential health risks, and negative impact on the water ecosystem, have driven the search for alternative, eco-friendly coagulants. Natural coagulants derived from plants, animals, or microorganisms have emerged as promising alternatives, offering advantages like biodegradability, non-toxicity, and lower sludge production. Among these, polysaccharide-based coagulants such as alginate, a biopolymer sourced from brown seaweed and bacteria, have gained significant attention. Alginate's biodegradability, non-toxicity, low cost, and versatile gelation properties make it a potential substitute for synthetic coagulants. This review focuses on the use of alginate as a coagulant-aid, providing an overview of its sources, characteristics, coagulation mechanisms, and variables that affect the coagulation performance. The review also highlights the benefits, challenges, and future research directions for improving the efficiency and scalability of alginate in sustainable water/wastewater treatment processes.
COMBINATION OF FeCl3 AND Fe3O4 AS A MAGNETIC COAGULANT FOR CONGO RED REMOVAL Asaf K Sugih; Muhammad A Deiza; Safri F Nurmawan; Susiana Prasetyo; Daniel Tan; Hans Kristianto
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 8, NUMBER 1, APRIL 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v8i1.22575

Abstract

Water pollution remains a critical environmental issue, necessitating efficient treatment technologies, among which, coagulation is still widely applied due to its effectiveness in removing colloidal particles and organic pollutants. Inorganic coagulants remain a preferred coagulant despite drawbacks such as excessive sludge formation and long settling times. To address these limitations, the integration of magnetic nanoparticles to form magnetic coagulants has emerged as a promising strategy. Aims: This study was aimed to investigate the effectiveness of the FeCl3 - magnetite (Fe3O4) combination as a magnetic coagulant for the removal of Congo red from synthetic wastewater. Methodology and results: The influence of key parameters, including pH (3-8), coagulant dose (4-44 mL/L), magnetite dose (0-200 mg/L), and initial dye concentration (50-100 mg/L), was systematically evaluated. Coagulation experiment was done by using a standard jar test apparatus.              The settling kinetic was evaluated by using pseudo-first and second-order kinetic model. Conclusion, significance and impact study: It was found that pH 6, coagulant dose of 20 mL/L FeCl3 0.5 M, and magnetite dose of 150 mg/L gave the best coagulation efficiency with 95% removal of 50 mg/L Congo red wastewater. Furthermore, the settling kinetics showed a good suitability with non-linear pseudo-second order-model kinetics. Results demonstrated that FeCl3-Fe3O4 as a magnetic coagulant significantly improved floc formation, settling efficiency, and overall pollutant removal.
STUDI AWAL SINTESIS PRODUK PATI TAPIOKA YANG MENGEMBANG DALAM AIR DINGIN (GRANULAR COLD WATER SWELLING STARCH): PENGARUH KOMPOSISI ETHANOL DAN KONSENTRASI AWAL PATI Asaf Kleopas Sugih; Dea Agata; Hans Kristianto; Henky Muljana
Jurnal Teknik Kimia Vol. 21 No. 02 (2026): JURNAL TEKNIK KIMIA
Publisher : Department of Chemical Engineering, Universitas Pembangunan Nasional Veteran Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnaltekkim.v21i02.98

Abstract

Abstrak. Pati tapioka merupakan komoditas industri berbasis pertanian penting di Indonesia yang juga adalah pati dengan volume produksi terbesar kedua secara global. Produk pati granular yang mengembang dalam air dingin atau Granular Cold Water Swelling (GCWS) starch merupakan produk pati termodifikasi secara fisik yang membentuk suspensi atau gel dalam air dingin. Pada penelitian ini dilakukan studi awal untuk mempelajari karakteristik fungsional produk GCWS yang disintesis dari pati tapioka lokal Bogor. Proses modifikasi dilakukan menggunakan Perlakuan Alkohol-Alkali (PAA) dengan media pensuspensi 40-60 %-b/b ethanol dalam air, konsentrasi awal pati sebesar 10-20 %-b/b, dan NaOH 3 M sebagai reagen alkali. Kelarutan dalam Air (KAD) dan Daya Kembang dalam Air Dingin (DKAD) pati tapioka GCWS hasil modifikasi meningkat hingga mencapai 45,07 %-b/b dan 10,27 g/g dibandingkan pati tapioka alami (5,26 %-b/b dan 2,64 g/ g). Perlakuan PAA juga memperbaiki secara signifikan kejernihan pasta dan kestabilan beku-cair gel pati tapioka. Penggunaan komposisi ethanol dan konsentrasi pati awal yang lebih rendah akan menghasilkan produk dengan KAD, DKAD, kejernihan pasta, dan kestabilan beku-cair yang lebih baik. Pati tapioka GCWS memiliki potensi untuk dimanfaatkan sebagai aditif pada produk pangan yang sensitif terhadap temperatur (seperti rempah dan nutraceuticals) serta pada produk dessert, saus, dan makanan instan. Kata kunci: tapioka, singkong, daya kembang, GCWS, pati termodifikasi Abstract. Tapioca starch is an important agricultural-based industrial commodity in Indonesia, and is the second most produced starch globally. Granular Cold Water Swelling (GCWS) starch product is a physically modified starch capable to form suspension and gel in cold water. In this research, a preliminary study on the functional characteristics of GWCS products synthesized from local Bogor tapioca starch was performed. The starch was modified using Alcoholic-Alkali Treatment (AAT) with 40-60 %-w/w ethanol in water as suspending medium, starch initial concentration of 10-20 %-w/w, and 3 M NaOH as alkali reagent. Solubility in Cold Water (SCW) and Swelling Power in Cold Water (SPCW) of GCWS starch tapioca products (until 45.07 %-b/b and 10.27 g/g, respectively) are significantly higher compared to native tapioca starch (5.25 %-w/w and 2.64 g/g). AAT method also improves paste clarity and freeze-thaw stability of the tapioca starch. The use of lower ethanol composition and initial water concentration resulted in products with higher SCW, SPCW, paste clarity, and freeze-thaw stability. GCWS tapioca starch products have the potentiality to be applied as additives for temperature-sensitive food products (such as spices and nutraceuticals), desserts, sauces, and instant foods. Keywords: tapioca, cassava, swelling power, GCWS, modified starch
Co-Authors Agung Nugroho Andranyssa V M Rumondor Angelica Jennifer Arenst Andreas Ariestya Arlene Arbita Asaf K Sugih Asaf K Sugih Asaf Kleopas Sugih Boas Tua Hotasi Budi H Bisowarno Budi Husodo Bisowarno Cahyadi Dwi Putra Christiandi Arifin Daniel Alvin Chaidir Daniel Tan Daniel Yonathan Dea Agata Devi Fitriani Kurniawati Febe Apecsiana Felicia M K Haryanto Gandajaya, Linda Hanna Priescilia Haryo Satriya Oktaviano Haryo Satriya Oktaviano Henky Muljana Jessica Atin Katherine Kho Lely Hiryanto Linda Gandajaya Mariskha Tri Adithia Muhammad A Deiza Muhammad Reza Wirayudha Pratama Nasti, Al Nadine De Nicolas Orlando Novitri Daulay Nugroho, Agung Ratna Frida Susanti Safri F Nurmawan Saptasari, Heny Selvya Utama Sembiring, Abraham Danofan Sharon Pricillia Siburian, Kyfti Yolanda Simanjorang, Lisbet Warty Soetedjo, Jenny Novianti M Susiana Prasetyo S Tedi Hudaya Windy Wilianti Yos Tri Atmodjo Yosep Christian