Lydia Rohmawati; Lytha Rizqika Lailia; Nugrahani Primary Putri; Munasir Nasir; Darminto Darminto
Abstract
ZnO nanoparticles can be used as a photocatalyst in waste treatment because they have good photodegradation. Synthesis of ZnO nanoparticles using green synthesis method from pineapple peel extract, whose results were characterized by XRD (Xray Diffraction), FTIR (Fourier Transform Infra-red), FESEM (Field ...
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ZnO nanoparticles can be used as a photocatalyst in waste treatment because they have good photodegradation. Synthesis of ZnO nanoparticles using green synthesis method from pineapple peel extract, whose results were characterized by XRD (Xray Diffraction), FTIR (Fourier Transform Infra-red), FESEM (Field Emission-Scanning Electron Microscopy), TEM (Transmission Electron Microscopy), Raman spectroscopy, photoluminescence, and a photocatalytic activity assay. This research showed that ZnO nanoparticles had wurtzite phase, alcohol functional groups, and phenol O-H, C=C alkenes, C-O, C-N, and Zn-O. ZnO nanoparticles had a particle size of 20.04 nm, a spherical shape, and a band gap energy of 3.28 eV. The Raman active mode E2(High) at 439.05 cm-1 confirmed the formation of pure phase wurtzite. Photoluminescence results indicated that two emission peaks at 392.07 nm and 595.07 nm were associated with defects such as oxygen and zinc vacancies. The results of the photocatalytic effectiveness test showed the highest percent degradation value of 99.86% at 180 minutes using UV light.
Munasir Nasir; Yekti Purnama Utami; Nuhaa Faaizatunnisa; Lydia Rohmawati; Evie Suebah; Ahmad Taufiq; Ezza Syuhada Sazali
Abstract
This study aims to determine the effectiveness of the GO- Fe3O4/Psf membrane in filtering water contaminated with dyes and salt. The membrane was prepared using the phase inversion method, with variations in the composition of GO- Fe3O4 (0.25%, 0.50%, 0.75%, and 1.00%), with polysulfone as the polymer ...
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This study aims to determine the effectiveness of the GO- Fe3O4/Psf membrane in filtering water contaminated with dyes and salt. The membrane was prepared using the phase inversion method, with variations in the composition of GO- Fe3O4 (0.25%, 0.50%, 0.75%, and 1.00%), with polysulfone as the polymer material and NMP as a diluent. The dead-end filtration method is used to study the ability to repel dyes and salt molecules in water. Hydrophilicity (surface contact angle test) and morphology (SEM) to confirm the membrane profile. Furthermore, rejection and filtration performance tests were carried out on water contaminated with dye (methylene blue) and water containing salt through salt rejection, flow flux, and UV-VIS tests. The filtration test results showed that the membrane with a composition of 0.75% had a salt rejection percentage of 59.33% (the highest), and the lowest flow flux was 54.42 L.m-2.h-1. The dye filtering results (MB) showed better performance on the same membrane. It has been observed that the permeate is brighter than the other membranes. These results indicate that the membrane with a GO- Fe3O4 concentration of 0.75 wt.% is the most effective compared to other membranes in filtering water. The presence of Fe3O4 nanoparticles increases the efficiency and durability of graphene membranes in salt rejection by increasing the surface charge and selectively adsorbing salt ions.
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