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All Journal POSITRON BERKALA SAINSTEK Makara Journal of Science
Destiarti, Lia
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Energy Mathematics Physics

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Electrochemically Exfoliated Graphite/Cu/Cu2O Composites and Their Photocatalytic Activity Destiarti, Lia; Abdillah, Oktaviardi Bityasmawan; Maharsi, Retno; Floweri, Octia; Iskandar, Ferry
POSITRON Vol 10, No 1 (2020): Vol. 10 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (537.126 KB) | DOI: 10.26418/positron.v10i1.37260

Abstract

In this work, the photocatalytic performance of electrochemically exfoliated graphite (EG) with low copper addition (≤ 5 wt.%) was studied. Composites of EG/Cu/Cu2O were successfully prepared by microwave-assisted in situ reduction method. FTIR spectra of the samples showed that the main functional groups of graphite were detected in the samples. XRD characterization further proved the presence of EG, Cu, and Cu2O in the samples. The higher proportion of Cu2O presented in the samples prepared with a higher amount of Cu2+. SEM analysis showed that Cu2O/Cu particles were homogeneously deposited on the surface of EG. The composites of EG, Cu, and Cu2O with a varied amount of Cu (1 and 5 wt. %) in EG / Cu2+ mixture were examined as photocatalyst in the degradation process of Rhodamine B (RhB). The photocatalytic degradation of RhB was analysed by observing its decolorization within a set time of irradiation. UV-Vis analysis revealed that the degradation of RhB in EG/Cu/Cu2O A and B for 105 minutes was 26 and 35 %, respectively. The result demonstrates that the sample with a larger amount of Cu2O (sample B, Cu 5 wt.%) shows higher photocatalytic activity in the degradation of RhB.
Sintesis Titanium Oksida/Reduced Graphene Oxide (TiO2/rGO) untuk Fotokatalisis Bahan Pewarna Metilen Biru Pratama, Andre; Destiarti, Lia; Adhitiyawarman, Adhitiyawarman
POSITRON Vol 11, No 1 (2021): Vol. 11 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (453.624 KB) | DOI: 10.26418/positron.v11i1.45355

Abstract

Metilen biru (MB) merupakan bahan pewarna tekstil yang banyak digunakan di industri. Fotokatalisis dapat digunakan untuk mendegradasi struktur senyawa MB yang kompleks tersebut. Faktor penting dalam fotokatalisis adalah peran dari katalis, dalam hal ini. reduced graphene oxide (rGO) telah berhasil disintesis dengan memodifikasi metode Hummer. Reduced graphene oxide dikompositkan dengan titanium oksida (TiO2) karena orbital d-π pada TiO2–rGO akan saling tumpang tindih sehingga eksitasi elektron dapat terjadi secara berulang untuk menekan rekombinasi saat fotokatalisis TiO2 dan meningkatkan efektifitas fotokatalisis dalam mendegradasi metilen biru. Reduced graphene oxide dibuat dengan cara mereduksi gugus oksida pada graphene oxide (GO) menggunakan hydrazine hydrate. Difraktogram XRD menunjukan karakteristik puncak GO pada 2θ = 10,3° dan 26,4° serta rGO pada 2θ = 26,4°. Fotokatalisis dilakukan pada MB dengan katalis TiO2, dan TiO2–rGO, dengan rentang waktu 0, 30, 60, 90, 120 menit. Hasil fotokatalisis TiO2–rGO terbukti lebih baik dari TiO2 dalam mendegrasi MB, dengan efisiensi degradasi TiO2–rGO adalah 85,38%, dan TiO2 sebesar 72,49%.
The Use of TiO2-SiO2 in Photocatalytic Process to Degrade Toxic and Dangerous Waste Destiarti, Lia; Tjokronegoro, Roekmiati; Rakhmawaty, Diana; Rudiyansyah,
Makara Journal of Science Vol. 19, No. 1
Publisher : UI Scholars Hub

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Abstract

This study was conducted to investigate the use of TiO2 immobilized on SiO2 (TiO2-SiO2) in a photocatalytic process to degrade toxic industrial waste, phenol, linear alkylbenzene sulfonate (LAS), and Cr(VI), which is dangerous for humans and the environment. Titanium dioxide (TiO2), as a photocatalyst, can make the solution become turbid. Thus, TiO2-SiO2 was used to increase the possibility of ultraviolet (UV) transmission. The phenol and LAS levels were measured with the Indonesian National Standard (INS) while the Cr(VI) level was determined with the colorimetric method. The activity test for the catalyst in suspension and immobilization against phenol showed that TiO2-SiO2 was more active than TiO2. By using the photocatalytic process with the TiO2-SiO2 photocatalyst for 8 h, degradation of phenol and LAS reached 50% as a single compound and 12% as a mixture. However, TiO2-SiO2 did not decrease Cr(VI)
TiO2-rGO Composite for Photocatalytic Decolorization of Methylene Blue Under the Visible Light Illumination Hidayati, Ulfa Farizka; Aritonang, Anthoni B.; Destiarti, Lia
BERKALA SAINSTEK Vol 9 No 4 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i4.27602

Abstract

Titanium dioxide-reduced graphene oxide (TiO2-rGO) was synthesized by hydrothermal method using TiO2 powder and rGO precursor from graphite rod by modified Marcano Method. The obtained TiO2-rGO photocatalyst was characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), and Diffuse reflectance UV (DRUV). Based on XRD diffractogram, it is known that TiO2 has an anatase crystal phase. In the FTIR spectrum, it was observed that there was an absorption peak at the wavenumber of 1630 cm-1 from the vibration (C=C) as an indication that the C atom was incorporated into the TiO2 structure. The incorporation of C atoms into the TiO2 structure to form TiO2-rGO causes the bandgap energy to decrease from 3.29 eV to 3.20 eV. The photocatalytic activity was tested against decolorization of methylene blue solution for 180 minutes under visible light illumination from a 50 watt LED lamp. Every 10 minutes, absorbance was measured using a UV-Vis spectrophotometer at a wavelength of 664 nm. TiO2-rGO photocatalyst has better photocatalytic activity with %D of 96.39% under UV light and 84.32% under visible light illumination, while TiO2 is only able to degrade 93.87% and 36.55%, respectively.
Co-Authors Abdillah, Oktaviardi Bityasmawan Adhitiyawarman, Adhitiyawarman Aritonang, Anthoni B. Diana Rakhmawaty Ferry Iskandar Floweri, Octia Hidayati, Ulfa Farizka Maharsi, Retno Roekmiati Tjokronegoro, Roekmiati RR. Ella Evrita Hestiandari Rudiyansyah,