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All Journal Hydrogen: Jurnal Kependidikan Kimia Jurnal Kimia Unand
Admi
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Materials Science & Nanotechnology

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Sintesis dan Karakterisasi Ni/MCM-41 dengan Metode Hidrotermal Admi; Radiatun Mardiah; Syukri Arief
Jurnal Kimia Unand Vol. 11 No. 1 (2022): May 2022
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.11.1.1-5.2022

Abstract

Synthesis of mesoporous silica (MCM-41) and mesoporous silica grafted with metal ion Ni(II) to form material (Ni/MCM-41) has been successfully carried out using the hydrothermal method. The results of the MCM-41 X-Ray Diffraction (XRD) characterization show a strong peak at 2q of 1.260 due to the reflection plane (100) and a very weak signal at 2q of 3.0° and 3.3° which corresponds to the reflection plane (110) and (200). The XRD pattern at this small angle indicates that MCM-41 material has been formed. MCM-41 is used as a support for grafting Ni(II) metal ions. After the Ni(II) metal ion was grafted to form Ni/MCM-41 material, the diffraction peak pattern did not change, but only a shift of the diffraction peak to the left (at a smaller angle), namely (100); (110) and (200) of 10°; 2.8°, and 3,0°. This proves the loading of 1% Ni(II) metal ions; 3% and 5% did not change the structure of MCM-41. Based on the FTIR results, the grafting of Ni(II) metal ions has been successful. Evidenced by the decrease in the absorption intensity of surface silanol groups in the range 3700-3200 cm-1 the number has decreased. This result was strengthened by a decrease in the intensity of the siloxane groups (Si-O-Si) in the range of 1250-1000 cm-1. Further evidence is strengthened by the appearance of a new vibrational band below 1000 cm-1 (980-1000 cm-1) which proves the existence of the Si-O-M+ (Si-O-Ni2+) spectrum. The results of this FTIR characterization prove that it has been successful in modifying the surface silanol groups of MCM-41 with metal ion Ni2+ to form Ni/MCM-41.
Theoretical Study of The Structure of Anthocyanin Dyes to Improve The Performance of Dye Sensitized Solar Cells (DSSCs) Imelda; Jusmarni; Aziz, Hermansyah; Deswita, Elvira; Admi; Ostari, Dwi Ningsih
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 Deswita, Elvira Hermansyah Aziz Imelda Jusmarni Ostari, Dwi Ningsih Radiatun Mardiah Syukri Arief