Riki Subagyo

ORCID: 0000-0002-7622-9114
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Research Areas
  • Advanced Photocatalysis Techniques
  • TiO2 Photocatalysis and Solar Cells
  • Gas Sensing Nanomaterials and Sensors
  • Adsorption and biosorption for pollutant removal
  • Mesoporous Materials and Catalysis
  • Advanced Nanomaterials in Catalysis
  • Copper-based nanomaterials and applications
  • Perovskite Materials and Applications
  • ZnO doping and properties
  • Nanomaterials for catalytic reactions
  • Catalytic Processes in Materials Science
  • Aerogels and thermal insulation
  • Conducting polymers and applications
  • Bauxite Residue and Utilization
  • Enzyme-mediated dye degradation
  • Adsorption and Cooling Systems
  • Catalysis and Hydrodesulfurization Studies
  • Ferroelectric and Piezoelectric Materials
  • Electrocatalysts for Energy Conversion
  • Advanced Cellulose Research Studies
  • Zeolite Catalysis and Synthesis
  • Microbial Metabolism and Applications
  • Medicinal Plants and Neuroprotection
  • Hibiscus Plant Research Studies
  • Pigment Synthesis and Properties

Sepuluh Nopember Institute of Technology
2020-2025

Red mud wastes have been converted into mesoporous zeolite socony mobile-5 (ZSM-5) followed by deposited titanium dioxide (TiO2) nanoparticles to generate synergy adsorption-photodegradation for removal of dye in waste water. The amount TiO2 loading was varied achieve optimum photocatalytic activity while maintaining the mesoporosity and high surface area ZSM-5. Sol-gel method facilitated formation anatase on fourier transform infrared spectra clarified Si–O–Ti at 957 cm−1 exchanging...

10.1016/j.arabjc.2022.103754 article EN cc-by-nc-nd Arabian Journal of Chemistry 2022-02-03

Mesoporous heterojunction MOF-derived α-Fe2O3/ZnO composites were prepared by a simple calcination of α-Fe2O3/ZIF-8 as sacrificial template. The optical properties confirm that coupling both the modified pore and n-n effectively reduces possibility photoinduced charge carrier recombination under irradiation. mesoporous Fe(25)ZnO with 25% loading α-Fe2O3 exhibited best performance in MB degradation, up to ∼100% after 150 minutes irradiation, higher than pristine ZnO α-Fe2O3. Furthermore,...

10.1039/d2ra07946a article EN cc-by-nc RSC Advances 2023-01-01

Encapsulation of hectorite-modified CTAB with Ca-alginate formed reusable adsorbent beads for wastewater treatment. The thermogravimetric analysis (TGA) investigation indicated excellent thermal stability results BHec-40 compared to Hec-40. Although the mesoporous surface area decreased 79.74 m2 g-1 224.21 Hec-40, hectorite-CTAB-alginate showed high adsorption capacity and methyl orange (MO) more than 60% removal after five adsorption-desorption cycles. influence pH (3-11), temperature (30,...

10.1039/d2ra06934b article EN cc-by-nc RSC Advances 2023-01-01

A series of bimetallic metal-organic frameworks (MOFs) photocatalysts had been successfully synthesized by doping nickel (Ni) into zeolitic imidazolate framework-8 (ZIF-8) for enhanced photodegradation methylene blue (MB). Optical characterization revealed that the Ni-ZIF-8 composites possessed a narrower bandgap and lower recombination rate charge carriers than pristine ZIF-8. The Ni(20)-ZIF-8 composite showed highest MB efficiency up to 93.22 % in 150 min, with use 30 mg photocatalyst, 50...

10.1016/j.cscee.2024.100828 article EN cc-by-nc Case Studies in Chemical and Environmental Engineering 2024-06-27

Low-dimensional bismuth-based hybrid organic-inorganic halide perovskites (Bi-HOIPs) are intriguing scintillating materials due to their anisotropic nature. However, a systematic investigation of Bi-HOIPs framework for X-ray detection imaging remains lacking. In...

10.1039/d4tc04390a article EN Journal of Materials Chemistry C 2025-01-01

Abstract Photocatalytic degradation of Methylene Blue (MB) by zinc oxide/zeolite socony mobile-5 (ZnO/ZSM-5) composites was investigated. The ZSM-5 material synthesized from red mud a two-step hydrothermal method to which ZnO loadings at different mass ratios were subsequently performed. Characterizations using X-ray diffraction (XRD), Fourier transform infrared spectroscopy, and scanning electron microscopy carried out identify the formation ZnO/ZSM-5. ZnO/ZSM-5 have cubic microcrystallite...

10.1186/s42834-021-00113-8 article EN cc-by Sustainable Environment Research 2022-01-10

Lapindo mud (LM) is a volcanic from natural disaster that occurred 16 years ago in Sidoarjo District, East Java, Indonesia. The high amount of silica the local materials LM has been extracted for gel synthesis via hydrometallurgy methods, followed by sol-gel methods. presence ethanol process generated unique textural property at different ratios between and sodium silicate (e/ss). Sol-gel mediated exhibited mesoporous properties with an amorphous structure, which characteristic gel. exhibits...

10.1039/d2ra07891k article EN cc-by-nc RSC Advances 2023-01-01

Sugar cane bagasse (SB) was modified with cetyltrimethylammonium bromide (CTAB), followed by impregnation zinc oxide (ZnO) to create a synergistic adsorption and photocatalytic system for methyl orange (MO) methylene blue (MB) removal. The presence of CTAB ZnO confirmed X-ray diffraction, Fourier transform infrared, energy dispersive (for Zn O). Modification SB (CSB) generated more positive sites on the surface SB, which enhanced MO removal compared that pristine SB. induces decrease in due...

10.1021/acsomega.4c02938 article EN cc-by-nc-nd ACS Omega 2024-05-28

In this study, the generation of 1D TiO2 nanowires was controlled by introducing NH4OH in a one-step hydrothermal method. The increasing amount reduced width resulting nanowires, revealing that altered morphologies synthesized nanowires. NTW20 showed best photoreduction performance since had smaller widths, large surface area and more efficient redox reaction on surface. comparison, absence photocatalyst yielded low activity 5.7 %, indicating an excellent photocatalysis reactions.

10.1016/j.cscee.2024.100719 article EN cc-by-nc-nd Case Studies in Chemical and Environmental Engineering 2024-04-18

The gunningite has been successfully synthesized using Pluronic F127 and gelatin as template via hydrothermal at 100-200 °C for 12-48 h. By scanning electron microscopy, nitrogen adsorption-desorption, X-ray diffraction, changes in structure, pore size, morphology due to ibuprofen adsorption were investigated gunningite. Various (temperature time) parameters had an influence on the percentage elimination (%) of ibuprofens. Gunningite's specific surface area intensifies from 14.60 24.03 m2/g...

10.1016/j.heliyon.2023.e14473 article EN cc-by-nc-nd Heliyon 2023-03-01

This study explores the utilization of natural compounds, including zinc oxide (ZnO) derived from aloe vera, chitosan, and pandan leaves (Pandanus amaryllifolius Roxb) extract, for development antimicrobial-coated fabric textiles. The objectives this research are to optimize formulation, structural properties, antimicrobial effectiveness these textiles through comprehensive characterization techniques, Fourier Transform Infrared Spectroscopy (FTIR), Particle Size Analysis (PSA), Scanning...

10.1080/01932691.2023.2296593 article EN Journal of Dispersion Science and Technology 2024-01-02

Diosgenin can overcome multiple health disorders but has low solubility in water. Zinc oxide nanoparticles (ZnO-NPs) have provided promising potential the biomedical field and were successful as a carrier for increasing diosgenin's solubility.

10.1039/d4ra03249g article EN cc-by-nc RSC Advances 2024-01-01
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