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All Journal Jurnal Fisika Unand Jurnal Riset Kimia Indonesian Journal of Chemistry Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Hydrogen: Jurnal Kependidikan Kimia
Admi Admi
Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Andalas
Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Medicine & Pharmacology Physics Social Sciences Other

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Studi Pendahuluan Uji Aktivitas Katalitik Katalis Montmorillonit K-10 Yang Dimodifikasi Cu2+ Admi, Admi; Isnaini, Delvi; Syukri, Syukri
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.820-826.2024

Abstract

The current study examines the catalytic activity of Cu2+-exchanged cation montmorillonite K-10 (MMT K-10) catalyst, which synthesized by hydrothermal method. X-ray fluoressence (XRF) and X-ray Diffraction (XRD) were used for characterizing the newly synthesis catalyst. The effect of thermal activation on the support of MMT K-10 with a modifier Cu investigated on its catalytic performance for conversion waste cooking oil to produce fatty acid methyl ester (FAME) by transesterification reaction. Synthesis biodiesel was further characterized by Gas Chromatography-Mass Spectroscopy (GC-MS). The biodiesel was obtained at transesterification reaction conditions: 3% (w/w) catalyst loading, molar ratio of oil to methanol = 1:10, and 3 h of reaction time at 90°C. The yield of FAME of WCO for MMT K-10, MMT K-10/Cu2+, MMT K-10 (activation 110°C)/Cu2+, MMT K-10 (activation 300°C)/Cu2+ catalysts were the 9,47%; 10,36%; 10,41%; and 12,01% of FAME, respectively. This study exhibites that the activation of thermal on the support MMT K-10 which modified by Cu2+ leads to reduction of the crystal size. The decreasing crystal size contributes on increasing catalytic performance of the heterogeneous catalyst.
Modifikasi Struktur Akseptor Zat Warna Tipe D-π-A Berbasis Ditiofen sebagai Sensitizer pada Sel Surya Reshiva Reshiva; Imelda Imelda; Syukri Syukri; Admi Admi; Elvira Deswita
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.614-622.2025

Abstract

This study aims to evaluate the effect of variations in the acceptor group of dithiophen-based type D-π-A dyes that are efficiently used as sensitizers in DSSC. The calculation uses the 16W Gaussian program with Density Functional Theory (DFT) and Time Dependent-DFT (TD-DFT) methods with the B3LYP/6-31G set base. Based on the results of the study, it is known that acceptor variations can affect the shift in absorption spectrum and bandgap values. The dye AT5 is predicted to have higher efficiency to be used as a sensitizer, because it has the smallest bandgap value and has a dipole moment value, as well as a larger wavelength. The smaller the bandgap value, the absorbedyu light will shift towards the red shift, and the electron excitation process will be easier. It can be concluded that dyes with cyanide formal acceptors can improve the efficiency of D-π-A type dyes as sensitizers in DSSC.
Theoretical Study of The Structure of Anthocyanin Dyes to Improve The Performance of Dye Sensitized Solar Cells (DSSCs) Imelda; Jusmarni; Hermansyah Aziz; Elvira Deswita; Admi; Dwi Ningsih Ostari
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.18246

Abstract

In this study, anthocyanin dyes have been designed in two ways: without modification and with modification, incorporating donor chains and π-chains, and forming the structure of type D-π-A dyes. The anthocyanin dyes used are delphinidine, cyanidin, pelargonidin, malvidin, petunidine, and fragarine. Meanwhile, the modified molecule is a combination of anthocyanin dye as an acceptor chain, coumarin as a donor chain, and 1,4-dihydro-pyrrolo[3,2-b]pyrrole as a π-conjugation chain. The molecular structure was calculated using a 16W Gaussian Software with the DFT method and the B3LYP/6-31G base set. The results of the calculation on the dye without modification showed that the malvidin dye produced the smallest bandgap of 2.4085 eV and the largest light absorption. Meanwhile, the results of the calculation of the modified dye showed that the modified dye with the delphinidin acceptor produced the smallest bandgap of 1.4485 eV and the largest light absorption. In conclusion, modified anthocyanin dyes can improve the light absorption efficiency in DSSCs.
Co-Authors A.A. Ketut Agung Cahyawan W Angellika, Florencia Tri Delvi Isnaini Dewi Khofifatul Khoiriah Dheasy Gustira Dwi Ningsih Ostari Elvira Deswita Elvira Deswita Fitria Ramadhani Fitria Ramadhani Florencia Tri Angellika Harza Dipajana Umardi Hermansyah Aziz Imelda Imelda Isnaini, Delvi Jihanul Khaira Jusmarni Khoiriah, Dewi Khofifatul Mega Mustika Rahmiana Zein Refilda Refilda Refinel - Reshiva Reshiva Rycce Sylviana Pratikha Safni Safni Syukri - Syukri Syukri Syukri Syukri Yefrida - Yetria Rilda