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All Journal Jurnal Rekayasa Proses PROSIDING SEMINAR NASIONAL Reaktor International Journal of Renewable Energy Development TEKNIK METANA JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Bahan Alam Terbarukan Seminar Nasional Teknik Kimia Kejuangan Jurnal Rekayasa Mesin Panrita Abdi - Jurnal Pengabdian pada Masyarakat Emerging Science Journal Communications in Science and Technology Jurnal Rekayasa Proses Jurnal Inovasi Teknik Kimia ASEAN Journal of Chemical Engineering Distilat: Jurnal Teknologi Separasi Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Warta Perkaretan Jurnal Profesi Insinyur Indonesia International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Bahan Alam Terbarukan
Andri Cahyo Kumoro
Department Of Chemical Engineering, Faculty Of Engineering, Diponegoro University
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Journal : Bulletin of Chemical Reaction Engineering

 1 
Kinetics of Starch Degradation during Extrusion Cooking of Steady State Flow Konjac (Amorphophallus oncophyllus) Tuber Flour in a Single Screw Extruder Andri Cahyo Kumoro; Diah Susetyo Retnowati; Ratnawati Ratnawati
Bulletin of Chemical Reaction Engineering & Catalysis 2020: BCREC Volume 15 Issue 2 Year 2020 (August 2020)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.15.2.8125.591-602

Abstract

The presence of glucomannan in Konjac (Amorphophallus oncophyllus) tuber flour has promoted its various applications, especially in the food, drink, drug delivery and cosmetics. Starch is the main impurity of Konjac tuber flour. Although the common wet refining method may result in a high purity Konjac tuber flour, it is very tedious, time consuming and costly. This research aimed to study the kinetics of starch degradation in the extrusion cooking process of dry refining method to produce high quality Konjac tuber flour. In this research, Konjac tuber flour with 20% (w/w) moisture was extruded in a single screw extruder by varying screw speeds (50, 75, 100, 125, 150 and 175 rpm) and barrel temperatures (353, 373, 393, 413 and 433 K). The results showed that the starch extrusion cooking obeys the first reaction order. The reaction rate constant could be satisfactorily fitted by Arrhenius correlation with total activation energy of 6191 J.mol−1 and pre-exponential factor of 2.8728×10−1 s−1. Accordingly, thermal degradation was found to be the primary cause of starch degradation, which shared more than 99% of the energy used for starch degradation. Based on mass Biot number and Thiele modulus evaluations, chemical reaction was the controlling mechanism of the process. The results of this research offer potential application in Konjac tuber flour refining process to obtain high quality flour product. Copyright © 2020 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).  
Kinetics of the Enzymatic Hydrolysis of Sweet Cassava Starch and Bitter Cassava Flour and Gadung (Dioscorea hispida Dennst) Flour at Low Temperature Hargono Hargono; Bakti Jos; Andri Cahyo Kumoro
Bulletin of Chemical Reaction Engineering & Catalysis 2017: BCREC Volume 12 Issue 2 Year 2017 (August 2017)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.12.2.808.256-262

Abstract

Starch is a potential substrate for this purpose, but the extra cost is needed to hydrolyze it into reducing sugar. As an alternative to the expensive and energy demanding conventional hydrolysis process, the low-temperature hydrolysis is being studied. Granular Starch Hydrolysing Enzyme (GSHE) was used in the process to degrade starch into reducing sugar at 30°C and pH 4. The substrates included bitter cassava flour, sweet cassava starch, and gadung flour. Starch concentrations studied were 50, 100, 150, 200, 250, 300, 350, and 400 g/L, respectively, while concentration of enzyme was 1.5 % (w/w). The optimum condition of the process was hydrolysis using 200 g/L of substrate concentration and enzyme  concentration of 1.5% for 12 h. It was found that the reducing sugar was  49.3  g/L and the productivity of reducing sugar (Qrs) was 4.11 (gL-1 h-1).   Lineweaver-Burk plot of Michaelis-Menten equation was used to study the inhibition kinetics. The Michaelis-Menten constants (Km)  for these three substrates were determined as 141.64 g/L, 137,64 g/L and 140.84 g/L for bitter cassava flour, sweet cassava starch, and gadung flour, respectively. The value of  Vm/Km, which denotes the affinity of the enzyme to the substrate, were determined and compared, and the result showed that the affinity (Vm) to the enzyme to this substrate followed  the order of sweet cassava starch˃ bitter cassava flour˃ gadung flour, and all are non-competitive inhibitor, while the  Ki value was 0.022 h -1. 
Mass Transfer and Chemical Reaction Approach of the Kinetics of the Acetylation of Gadung Flour using Glacial Acetic Acid Andri Cahyo Kumoro; Rizka Amalia
Bulletin of Chemical Reaction Engineering & Catalysis 2015: BCREC Volume 10 Issue 1 Year 2015 (April 2015)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.10.1.7181.30-37

Abstract

Acetylation is one of the common methods of modifying starch properties by introducing acetil (CH3CO) groups to starch molecules at low temperatures. While most acetylation is conducted using starch as anhidroglucose source and acetic anhydride or vinyl acetate as nucleophilic agents, this work employ reactants, namely flour and glacial acetic acid. The purpose of this work are to study the effect of pH reaction and GAA/GF mass ratio on the rate of acetylation reaction and to determine its rate constants. The acetylation of gadung flour with glacial acetic acid in the presence of sodium hydroxide as a homogenous catalyst was studied at ambient temperature with pH ranging from 8-10 and different mass ratio of acetic acid : gadung flour (1:3; 1:4; and 1:5). It was found that increasing pH, lead to increase the degree of substitution, while increasing GAA/GF mass ratio caused such decreases in the degree of substitution, due to the hydrolysis of the acetylated starch. The desired starch acetylation reaction is accompanied by undesirable hydrolysis reaction of the acetylated starch after 40-50 minutes reaction time. Investigation of kinetics of the reaction observed that the value of mass transfer rate constant (Kcs) is smaller than the surface reaction rate constant (k). Thus, it can be concluded that rate controlling step is mass transfer. © 2015 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0)
Enhanced Photocatalytic Performance and Kinetic Improvement of Reusable W-based POM Composite for Produced Water Treatment Kusworo, Tutuk Djoko; Kumoro, Andri Cahyo; Veda, Adalia; Mafazan, Rafi; Puspa, Meitri Bella; Azizah, Dita Aulia; Utomo, Dani Puji
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 2 Year 2026 (August 2026) (Issue in Progress)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20616

Abstract

Produced water treatment remains a major challenge due to its complex contaminant composition and the limited efficiency and reusability of conventional photocatalysts. Polyoxometalate (POM)-based materials offer high redox activity and structural tunability. This study presents a novel tungsten-based polyoxometalate (W-based POM) composite with enhanced photocatalytic performance and kinetic superiority for produced water treatment. The objective of this work was to synthesize a reusable W-based POM composite and systematically evaluate its photocatalytic activity, adsorption behavior, kinetics, and stability. The composite was synthesized via a solvothermal method using Na₂WO₄·2H₂O and DMF. Photocatalytic experiments were performed by varying catalyst dosage (0.1–0.5 g), irradiation time (30-180 min), and reusability cycles. The W-based POM composite exhibited a rhombic polyhedral morphology with a well-organized three-dimensional POM framework, reduced crystallite size (14.8 nm), and compressive lattice strain, contributing to improved charge mobility. Optical analysis revealed a red-shift in the absorption edge, reducing the band gap from 2.80 eV to 2.25 eV and enhancing visible-light utilization. Photocatalytic experiments demonstrated high treatment efficiency, achieving 90% NH₃–N and 84% total dissolved solids (TDS) removal under UV irradiation within 180 minutes at an optimal dosage of 0.3 g. Adsorption behavior followed the Dubinin–Radushkevich and Temkin isotherm models, indicating an ion-exchange-dominated mechanism, while kinetic analysis revealed a multi-step process governed by intraparticle diffusion. The composite maintained stable performance over three consecutive cycles without significant activity loss. Overall, the results highlight the strong potential of W-based POM composites as efficient, reusable, and scalable photocatalysts for advanced produced water treatment. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors . Widayat Adi Cifriadi Adi Cifriadi, Adi Agus Suprihanto Agus Suprihanto Aji Prasetyaningrum Alfariji, Moh Ana Farida Aprilina Purbasari Ardianingsih, Retno Arkie Septiana A. Arkie Septiana A. Aryanti, Nita Asep Muhamad Samsudin, Asep Muhamad Asron Ferdian Falaah Asron Ferdian Falaah, Asron Ferdian Avriliana Dewi A. Azizah, Dita Aulia Bakti Jos Bakti Jos Budiyono Budiyono C Sri Budiyati Catarina Sri Budiyati Catarina Sri Budiyati Catarina Sri Budiyati Cindi Yasintasia Dessy Ariyanti Diah Permata Wijayanti Diah Susetyo Retnowati Didi Dwi Anggoro Dwi Haryanti Dyah Hesti Wardhani Evi Ristanti R F Widhi Mahatmanti Fahni, Yunita Fauzan, Ahmad - Ferry Hermawan Fitra Pradhita Frans Arienata H. Frans Arienata H. Frastia, Wike H Hadiyanto H. Hargono Hacker, Viktor Hargono . Hargono Hargono Hargono Hargono Kamil, Muhamad Idham Kharis Yohan Abidin, Kharis Yohan Kristinah Haryani Kurniawan, Tonni Agustiono Laeli Kurniasari M. Djaeni Mafazan, Rafi Maharani Ratridewi Marcelinus Christwardana Margaretha Praba Aulia Marissa Widiyanti Masitah Hasan Misbahudin Alhanif Moh Djaeni Monica Setiono H. Muhammad Haqqiyuddin Robbani Mustafa Nafiunisa, Aininu Nasher, Kharissa Nita Aryanti Nor Basid Adiwibawa Prasetya Nur Rokhati Nurul Aini Pamungkas, Prihantoro Pandapotan, Boris Poltak Permanadewi, Indrasukma Puspa, Meitri Bella Putra, Ade Septia Ratnawati Ratnawati Retno Wulandari Riris Yuliana Y.S. Rizka Amalia Rizka Amalia Rizka Amalia Roschger, Michaela Saputri, Desi Riana Setia Budi Sasongko Silviana Silviana Sofiah Sofiah Sri Sinto Dewi Sulardjaka Sulardjaka Sulardjaka Sumardi . Sumardi Sumardi Tutuk Djoko Kusworo Utami, Esti Utomo, Dani Puji Veda, Adalia Wahyono, Yoyon Wahyudi, Dhiky Wardhani, Dyah Hesti Wikanastri Hersoelistyorini Wilis Ari Setyati Yuni Susanti, Devi Yusupandi, Fauzi Zahra, Nurul Afifah Zaim, Hanif Fawwaz