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All Journal Indonesian Journal of Chemistry Makara Journal of Science Molekul: Jurnal Ilmiah Kimia Bulletin of Chemical Reaction Engineering & Catalysis
Pambudi, Fajar Inggit
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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Silver-and-Sulphur-Codoped Fe3O4/TiO2 as a Magnetically Separable Photocatalyst for Methylene Blue Degradation under Visible Light Kunarti, Eko Sri; Agustiningsih, Dewi; Pambudi, Fajar Inggit; Rusli, Stefen; Rusdiarso, Bambang
Molekul Vol 19 No 1 (2024)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2024.19.1.9508

Abstract

This research aimed to investigate how the addition of silver and sulphur dopants modified the TiO2 photocatalyst to enhance its responsiveness to visible light and improve its photocatalytic activity for methylene blue degradation. In addition, Fe3O4 was also added as a core to add magnetic properties to the photocatalyst material. The Fe3O4/TiO2-Ag/S materials were prepared using FeCl3.6H2O and FeSO4.7H2O as the magnetite precursors, titanium tetraisopropoxide (TTIP) as the TiO2 precursor, while AgNO3 and CH4N2S were used as the sources for silver and sulphur dopants, respectively. The synthesized materials were next characterized using FT-IR, XRD, UV-Vis spectrophotometer, SEM-EDX, TEM, and VSM. The activity of the photocatalyst was then assessed through methylene blue degradation in a closed reactor involving various contained Ag:S ratios and reusability examination. The evaluation of photocatalytic degradation results was performed using UV-Vis spectrophotometry. Afterwards, the research findings indicate that the Fe3O4/TiO2-Ag/S was successfully synthesized and exhibited magnetic properties with a saturation magnetization value of 5.33 emu/g. The highest photocatalytic activity (98.21%) was observed in Fe3O4/TiO2-Ag/S (1:1) with a band gap energy value of 2.64 eV under visible light exposure at pH 10, 120 min, 10 mg mass of the photocatalyst, and methylene blue concentration of 5 mgL-1. Furthermore, the Fe3O4/TiO2-Ag/S photocatalyst was known to perform good stability through four reuse cycles.
Investigating the Structure of Defects in Heterometallic Zeolitic Imidazolate Frameworks ZIF-8(Zn/Cd) and Its Interaction with CO2 Using First-Principle Calculations Pambudi, Fajar Inggit; Sutarno, Sutarno; Hatmanto, Adhi Dwi; Patmawati, Mita; Utari, Tika Dwi
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 2 Year 2024 (August 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20136

Abstract

Inducing defect in metal-organic frameworks (MOFs) is one of the strategies to modify the structure and properties of this functional material. Defect may occur in a pristine MOF due to missing organic linkers, metal centres and/or other structural behaviours. In this study, the structure of defects in multicomponent MOFs especially heterometallic MOFs of zeolitic imidazolate framework (ZIF-8(Zn/Cd)) was examined to unveil the possible preference defect formation due to missing 2-methylimidazolate (MeIm) and metal centres of Cd2+ and Zn2+. Assuming defect formation due to the reaction between ZIF-8(Zn/Cd) and water, MeIm linker removal is energetically lower than removing metal centres of either Cd2+ or Zn2+. But, the MeIm linker is easier to be removed when it is connected to Cd2+ (Cd-MeIm-Cd) than when it is connected to Zn2+ (Zn-MeIm-Zn). Defect in ZIF-8(Zn/Cd) affects the band gap energy to give slightly lower value than it in pristine ZIF-8(Zn/Cd). Non-covalent interaction (NCI) and interaction region indicator (IRI) analyses were also performed to indicate possible intermolecular forces such as van der Waals and attractive forces present in non-defective and defective ZIF-8(Zn/Cd). The presence of defects in mixed-metal ZIF-8(Zn/Cd) was also tested for its potential use on CO2 adsorption. The interaction energy of CO2 inside defective ZIF-8(Zn/Cd) indicates an exothermic behaviour where CO2 molecule has a preference to be adsorbed inside the framework. This is especially when the capping agents at the defective ZIF-8(Zn/Cd) sites are removed to give open metal sites. This study provides insight how defects in multicomponent MOFs might presence affecting the structural and properties changes. Copyright © 2024 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). 
Immobilization of Ni(II) on Amine-Functionalized Mesoporous Silica as Catalyst for Benzyl Alcohol Acetylation Reaction Nabilah, Wardah; Kunarti, Eko Sri; Pambudi, Fajar Inggit
Makara Journal of Science Vol. 28, No. 3
Publisher : UI Scholars Hub

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Abstract

In this study, amine-functionalized and Ni(II)-immobilized mesoporous silica materials were synthesized. This research aimed to synthesize mesoporous silica based on rice husk ash functionalized with amine and immobilized with Ni(II). The activity of amine-functionalized and Ni(II)-immobilized mesoporous silica materials was studied for the acetylation of benzyl alcohol with acetic anhydride as the acetylating agent. First, mesoporous silica was synthesized using rice husk ash using the sol–gel method, followed by amine functionalization using (3-aminopropyl)triethoxysilane (APTES) and Ni(II) immobilization through ultrasonic treatment. The results obtained showed that amine-functionalized and Ni(II)-immobilized mesoporous silica (SiO2/APTES/Ni(II)) were successfully synthesized, confirmed by Fourier transform infrared and Energy-dispersive X-ray spectrometry data. In addition, the synthesized materials had an average pore diameter of 12.83 nm. Afterward, the catalytic activity test showed that SiO2/APTES/Ni(II) was able to convert 98.34% of benzyl alcohol in the acetylation reaction at 45 °C for 5 h. The use of the SiO2/APTES/Ni(II) catalyst for three cycles obtained percent conversion values with a slight decreases (98.34%, 95.20%, and 90.61%).
Enhanced Photocatalytic Activity and Magnetic Properties of CoFe2O4/TiO2-Ag/S for Visible Light-Driven Photodegradation of Methylene Blue Kunarti, Eko Sri; Agustiningsih, Dewi; Pambudi, Fajar Inggit; Syoufian, Akhmad; Santosa, Sri Juari
Indonesian Journal of Chemistry Vol 25, No 1 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.100142

Abstract

Environmental concerns drive the need for effective photocatalysts that can operate under visible light to degrade organic pollutants in wastewater. This study investigated TiO2-based photocatalyst doped with Ag and S to enhance its visible-light response, modified further with CoFe2O4 to introduce magnetic properties, resulting in a composite, CoFe2O4/TiO2-Ag/S. The synthesis was carried out by using cobalt nitrate hexahydrate and ferric nitrate nonahydrate for CoFe2O4 precursor, titanium tetraisopropoxide for TiO2 precursor, and silver nitrate with thiourea for Ag and S dopants. Results from characterization analyses, including FTIR, XRD, UV-vis, SEM-EDX, TEM, and VSM, confirmed the composite structure, with magnetic properties reflected in saturation magnetization of 10.69 emu g−1 and an extended UV-vis absorption edge indicating improved visible light activity. Photocatalytic tests for methylene blue degradation showed the highest performance (92%) with a 1:1 Ag:S ratio under visible light at pH 10 over 120 min, using 20 mg of catalyst in 5 ppm solution. Additionally, the composite demonstrated strong stability, retaining efficiency across six cycles of reuse.
Betel Nut Peel Powder as Biosorbent for Mg(II), Ca(II), and Fe(III) in Agricultural Water Susiana, Carissa Ayu; Mukhayani, Feri; Simatupang, Erwinton; Pambudi, Fajar Inggit; Sumerta, I Wayan; Mulyanegara, Guntur; Samudin, Mohammad Nur; Prayoga, Dedo Kevin; Nuryono, Nuryono
Indonesian Journal of Chemistry Vol 25, No 3 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.104229

Abstract

Water pollution from heavy metal contamination is a global issue; finding low-cost and sustainable solutions is challenging. Among various methods, biomass adsorption is a practical approach for treating heavy metal contamination in agricultural water. This study explored the use of betel nut peel as a biosorbent to remove Mg(II), Ca(II), and Fe(III) ions from agricultural water. The adsorbent contained active groups like −OH, C=O, and C=C, indicating cellulose, lignin, and hemicellulose compounds. Mature betel nut peels showed higher adsorption capacities than immature ones due to their larger surface area and more active sites. The optimal adsorption occurred at an initial adsorbate concentration of 100 mg L−1 for 1 h, with 5 mg of biosorbent. The biosorbent followed the Langmuir isotherm and a pseudo-second-order kinetic model (R2 = 0.99), indicating chemisorption. When applied to agricultural water from South Sumatra, the biosorbent removed up to 90% of Fe(III) ions. These findings suggest that betel nut peel powder has strong potential as a biosorbent for heavy metals, with promising applications in water treatment and environmental remediation. It also shows potential as a biofertilizer, particularly for soils rich in Fe(III).
Ultrasonic-Assisted Transesterification of Tripalmitin Using Limestone-Derived CaO Catalyst Nurdina, Rakhma Amalia; Kamiya, Yuichi; Hatmanto, Adhi Dwi; Pambudi, Fajar Inggit; Suyanta, Suyanta; Nuryono, Nuryono
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 4 Year 2025 (December 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20456

Abstract

In producing palm oil-based biodiesel (fatty acid methyl esters) through the transesterification of triglycerides with methanol, a high-performance and straightforward catalyst is required. This research studies the synthesis and characterization of limestone-derived calcium oxide as a heterogeneous base catalyst for the transesterification of tripalmitin, a representation of palm oil triglycerides, with methanol to produce methyl palmitate. Limestone was calcined at 800 °C to produce CaO. The resulting catalyst was characterized using TGA, XRD, FTIR, SAA, and CO2-TPD. The catalytic performance was compared with that of commercial calcium oxide under optimal reaction conditions, namely 50 °C temperature, 60 min reaction time, and 30 mg catalyst mass. The results showed that limestone-derived CaO produced a higher yield (44.6%) than commercial CaO (32.3%). The kinetics study showed that the reaction followed a two-order pseudo-kinetic model with a reaction rate constant value of 0.1450 L mmol-1 min-1. Overall, limestone-derived CaO proved to be an effective, inexpensive, and environmentally friendly alternative catalyst in the production of triglyceride-based biodiesel. Furthermore, the modification of CaO to enhance the catalytic activity needs to be explored further. Copyright © 2025 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).
Missing Linker Defects in Heterometallic (Zn/Cd)-MOF-5: A First-Principles Study of Structural Properties and Gas Interaction Pambudi, Fajar Inggit; Kunarti, Eko Sri; Cahyono, Robby Noor; Agusti, Nabila Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 4 Year 2025 (December 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20464

Abstract

The defect structures in multicomponent metal-organic frameworks (MOFs), specifically mixed-metal (Zn/Cd)-MOF-5, were investigated by examining the removal of a benzenedicarboxylate (bdc2-) linker. The defect formation, induced by the reaction with water, was studied, and the reaction energy was calculated to be relatively low, ranging from 0.24 eV to 0.60 eV. The removal of a bdc2- linker is energetically favourable when it is initially coordinated to both Zn2+ and Cd2+ ions. The electronic properties of defective (Zn/Cd)-MOF-5 were analyzed in terms of bandgap energy and density of states profile. The removal of the bdc2- linker slightly reduced the bandgap energy and affected the electronic states of both carbon and oxygen atoms. To evaluate the impact of defects, interactions with various gas molecules, including H2O, CO2, CO, H2S, and NO2, were studied. The defective (Zn/Cd)-MOF-5 showed a strong preference for H2O molecules, while CO2 exhibited the lowest binding preference among the gases studied. Copyright © 2025 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 Agusti, Nabila Nur Akhmad Syoufian Bambang Rusdiarso Dewi Agustiningsih, Dewi Eko Sri Kunarti Hatmanto, Adhi Dwi Kamiya, Yuichi Mukhayani, Feri Mulyanegara, Guntur Nabilah, Wardah Nurdina, Rakhma Amalia Nuryono Nuryono Patmawati, Mita Prayoga, Dedo Kevin Robby Noor Cahyono Rusli, Stefen Samudin, Mohammad Nur Simatupang, Erwinton Sri Juari Santosa Sumerta, I Wayan Susiana, Carissa Ayu Sutarno Sutarno Suyanta Suyanta Utari, Tika Dwi