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Aflaha , Rizky
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Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Materials Science & Nanotechnology

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Effect of Zeolite Mesh Size Variation on the Filtration Performance of Zeolite-PAN/PVDF Nanofiber for Methylene Blue Dye Removal Buya, Dheace Gracesela; Aflaha , Rizky; Rianjanu, Aditya
Greensusmater Vol. 2 No. 1 (2025)
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/greensusmater.2025.2.1.1-6

Abstract

Water pollution from industrial effluents, particularly synthetic dyes like methylene blue (MB), poses significant environmental challenges. Electrospun nanofiber membranes based on polyacrylonitrile (PAN) and polyvinylidene fluoride (PVDF) are promising for filtration due to their high surface area and porous structure. However, their limited dye adsorption capacity requires enhancement, which can be achieved by incorporating natural zeolite particles known for their high ion-exchange capacity. In this study, we developed Ze-PAN/PVDF nanofiber membranes using zeolite with varying particle sizes (mesh sizes 50, 100, 200, 300) via vacuum filtration and evaluated their performance in MB dye removal. All Ze-PAN/PVDF membranes exhibited high initial dye rejection (above 97%) in the first two cycles, while the control PAN/PVDF membrane showed minimal rejection, decreasing from 35% to 7% over five cycles. The decline in rejection efficiency became noticeable from the third cycle, with values of 67%, 39%, 74%, and 86% for Ze50, Ze100, Ze200, and Ze300, respectively. Permeation flux was significantly affected by zeolite particle size, with the PAN/PVDF membrane maintaining a high flux (>10,000 L m⁻² h⁻¹ bar⁻¹), while Ze50-PAN/PVDF dropped to 260 ± 30 L m⁻² h⁻¹ bar⁻¹. Finer particles in Ze300-PAN/PVDF maintained relatively higher flux (370 ± 200 L m⁻² h⁻¹ bar⁻¹), indicating reduced pore blockage. These findings highlight the importance of optimizing zeolite particle size to achieve high dye removal efficiency and stable flux, making Ze300-PAN/PVDF a promising candidate for wastewater treatment applications.
Effect of calcination temperature on the performance of hydrothermally grown cerium dioxide (CeO2) nanorods for the removal of Congo red dyes Rianjanu , Aditya; Nuraeni , Resti; Aflaha , Rizky; Khamidy , Nur Istiqomah; Triyana , Kuwat; Taher , Tarmizi
Greensusmater Vol. 1 No. 1 (2024): Inaugural issue
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/greensusmater.2024.1.1.9-14

Abstract

This study investigates the transformation of CeO2 nanostructures through various calcination temperatures and their subsequent impact on morphological, structural, and photocatalytic properties. X-ray diffraction (XRD) analysis reveals the presence of cerium oxycarbonate in the uncalcined samples, transitioning to a face centered cubic CeO2 phase post-calcination at 500°C. The scanning electron microscopy (SEM) imaging delineates a morphological evolution from distinct, rod-like structures in the uncalcined state to sintered, agglomerated forms as calcination temperatures ascend from 500°C to 800°C. The crystallite size, calculated using Scherrer's Equation, displayed a proportional increase with temperature. The photocatalytic degradation of Congo red dye under UV light was analyzed using UV-Vis spectroscopy, with the calcined samples exhibiting varying degrees of adsorption and photocatalytic activity. The study found that higher calcination temperatures correlate with increased photocatalytic performance, potentially due to enhanced crystallinity. This assertion is supported by pseudo-first-order kinetic modeling, indicating improved photocatalytic efficiency with higher calcination temperatures, underlined by increasing rate constants. These findings underscore the intricate relationship between calcination-induced morphological and structural changes and the photocatalytic prowess of CeO2 nanostructures.
Degradation of air pollutants from waste burning using photocatalyst TiO2 with Co(NO3)2 doped under ultraviolet irradiation Munna , Kamila; Aflaha , Rizky; Chotimah , Chotimah
Greensusmater Vol. 1 No. 1 (2024): Inaugural issue
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/greensusmater.2024.1.1.25-31

Abstract

Air pollutants, such as carbon dioxide (CO2), hydrogen cyanide (HCN), and methane (CH4), can harm the respiratory organs of humans and cause several diseases. This study successfully utilized a photocatalyst from TiO2 with Co(NO3)2 doped to degrade these air pollutants from waste burning. The photocatalyst layer was produced by dissolving TiO2 and Co(NO3)2 in distilled water, and then the solution was coated on a mica surface using a spray coating method. The coated mica was then dried in an oven. The crystallite structure of TiO2/Co(NO3)2 was analyzed by X-ray diffraction. The obtained crystallite size was (15.38 ± 0.03) nm with lattice parameters a and c were (3.8 ± 0.3) Å and (9.3 ± 0.3) Å, respectively, which shows that it is an anatase phase. The band gap energy was measured by diffuse reflectance UV-visible spectroscopy and analyzed by Tauc's plot method. The measured band gap energy of the photocatalyst was 2.81 eV, which can be easily activated by ultraviolet (UV) light. The photocatalyst sheets successfully degraded air pollutants from waste burning, including 53.139% CO2 for 4 hours, 100% HCN for 10 minutes, and 72.381% CH4 for 40 minutes. Therefore, the fabricated photocatalyst in this study can potentially be an alternative to degrading air pollutants, especially CO2, HCN, and CH4.
Investigating the influence of polyacrylonitrile nanofiber thickness on particulate matter filtration performance from cigarette smoke Wardiningsih , Dina; Aflaha , Rizky; Maharani , Chlara Naren; Triyana , Kuwat; Kusumaatmaja, Ahmad
Greensusmater Vol. 1 No. 1 (2024): Inaugural issue
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/greensusmater.2024.1.1.32-38

Abstract

This study successfully fabricated polyacrylonitrile (PAN) nanofiber in various thicknesses as particulate matter (PM) filtration membranes using the electrospinning method. The PM source used was derived from cigarette smoke. Scanning electron microscopy (SEM) images and Fourier-transform infrared (FTIR) spectra are provided in the manuscript to observe the morphology and chemical composition of the fabricated nanofiber membrane. The thickness of the nanofiber was controlled based on the volume of the polymer solution, which was 4 mL, 6 mL, and 8 mL, and had a thickness of (52 ± 2) µm, (176 ± 27) µm, and (479 ± 38) µm, respectively (denoted as NF-4, NF-6, and NF-8 membranes). The results showed that the nanofiber membrane performed well against PM0.3, PM1, and PM2.5, with efficiency above 95.7%. Furthermore, it was observed that increasing the thickness of the nanofiber resulted in higher filtration efficiency. This trend is evident in the NF-8 membrane, which exhibited an efficiency of (97.9 ± 0.3)%, compared to only (95.7 ± 0.2)% for the NF-4 membrane against PM0.3. However, the pressure drop is also higher ((0.03 ± 0.005) kPa), which causes a trade-off in the quality factor (QF) of fabricated nanofiber performance as a PM filtration membrane.
Co-Authors Buya, Dheace Gracesela Chotimah , Chotimah Khamidy , Nur Istiqomah Kusumaatmaja, Ahmad Maharani , Chlara Naren Munna , Kamila Nuraeni , Resti Rianjanu, Aditya Taher , Tarmizi Triyana , Kuwat Wardiningsih , Dina