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All Journal Jurnal Fisika Unand Jurnal Riset Kimia
Admi Admi
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Andalas University, Kampus Unand Limau Manis Padang, 25163
Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Sintesis dan Karakterisasi Enkapsulat Katalis Nikel (II) pada Silika Mesopori Modifikasi Admi, Admi; Ramadhani, Fitria; Syukri, Syukri
Jurnal Riset Kimia Vol 11, No 2 (2020): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v11i2.356

Abstract

Ni(II)-BF3/MCM-41 was synthesized for heterogeneous catalyst. The boron trifluoride modified mesoporous silica BF3/MCM-41 was studied to investigate its ability as supporting agent in heterogeneous catalysis system. For this purpose, the structural directing agent remaining in as-synthesis MCM-41 removed by solvent extraction. Surface modification of mesoporous silica MCM-41 with aniline and boron trifluoride was carried out. Then, the surface of boron trifluoride modified mesoporous silica was subjected to an encapsulation with Ni(II) ions. These solid materials were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and atomic absorption spectroscopy (AAS). In the FTIR spectra of the modified silica mesoporous, the presence of vibration band >Si-O-B confirm the success of modification of support. While, the shifting of the vibration band >Si-O-Si< is considered an indication of the proof of Ni(II) species onto the modified mesoporous silica. From the SEM photograph, it can be seen that the morphology of the Ni(II)-BF3/MCM-41 tend to form aggregates of smaller particles. Based on measurement of metal content by AAS, it was known that the value of metal loading is 33%. While for the leaching test, Ni(II)-BF3/MCM-41 lost only 0.014 % of Ni metal. It indicates the stability of the interaction between the N(II) and support of the modified mesoporous silica.
Natural Clay yang Dimodifikasi Nikel dan Aplikasi Katalitik Untuk Produksi FAME : Efek Support dan Prekursor Nikel Admi, Admi; Mustika, Mega; Syukri, Syukri
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.235-241.2025

Abstract

This study was conducted to investigate the use of nickel modified clay as heterogeneous catalyst for the production of fatty acid methyl ester (FAME) from crude palm oil (CPO). The catalyst was prepared by Ni2+- exchanged cation supported on clay under controlled conditions. The results of X-ray Fluorescence analysis (XRF) indicated that Ni2+- exchanged cation modified on support of clay. The results of X-ray Diffraction (XRD) analysis confirmed that support of clay with characteristic of kaolinite mineral. Effect of supports of clay (h-clay and c/h-clay) and effect of nickel precursors (nickel sulfate and nickel nitrate) on the catalytic performance of heterogeneous catalysts in the transesterification reaction of CPO were investigated. The obtained data showed that transesterification processes at oil/methanol ratio of 1 : 6, reaction temperature of 85 oC, catalyst/methanol ratio of 1 : 10, and reaction time of 4 h produced yield of 51,19% FAME, 1,9% FAME, 4,74% FAME, and 47,8% FAME for catalytic performance of h-clay, c/h-clay, h-clay/Ni-Sulfate and h-clay/Ni-Nitrate, respectively. Ni2+- exchanged cation supported on h-clay prepared using two different precursors, nickel nitrate indicating higher catalytic activity than nickel sulfate.
Pengaruh Modifikasi Fisika pada Komposisi, Struktur Kristal dan Sifat Katalitik Lempung Solok Admi, Admi; Angellika, Florencia Tri; Rilda, Yetria; Syukri, Syukri
Jurnal Fisika Unand Vol 11 No 4 (2022)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.11.4.548-555.2022

Abstract

Mineral lempung yang diperoleh dari Kabupaten Solok, Sumatera Barat, telah dimodifikasi secara fisika melalui pemanasan pada 105°C, 450°C dan 850°C. Aktivitas katalitiknya telah diuji dalam transesterifikasi minyak jelantah untuk menghasilkan metil ester asam lemak. Komposisi utama lempung ditemukan terdiri dari Si, Al dan Fe serta unsur-unsur minor lainnya seperti K, Ti, Na, Ca Mg, dan Mn (pengukuran XRF). Jenis mineral utama sampel lempung adalah kaolinite dan illite (karakterisasi XRD). Kalsinasi pada suhu 850 °C mengakibatkan penurunan fasa kaolinit yang menandakan telah terjadi transformasi parsial menjadi metakaolin (analisis XRD). Pengujian aktivitas katalitik di bawah kondisi reaksi tertentu dari semua lempung menunjukkan bahwa lempung yang dikalsinasi pada 850°C menghasilkan dua jenis senyawa biodiesel yaitu metil ester asam palmitat dan metil ester asam oleat (analisis GC-MS). Tanah liat yang dipanaskan pada suhu 110 dan 450 oC sama sekali tidak menunjukkan aktivitas katalitik
Montmorillonit K-10 yang Dimodifikasi Ni2+: Sifat Struktur dan Aktivitas Katalitik Admi, Admi; Khoiriah, Dewi Khofifatul; Syukri, Syukri
Jurnal Fisika Unand Vol 13 No 3 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.3.439-444.2024

Abstract

Fokus studi ini adalah mensintesis material berbasis montmorillonit K-10 yang dimodifikasi dengan spesies Ni2+ melalui metoda hidrotermal. Pengaruh aktivasi termal terhadap support montmorillonit K-10 pada proses pertukaran kation untuk menghasilkan katalis heterogen dikarakterisasi dengan x-raydiffraction (XRD) dan x-ray fluoressence (XRF). Analisis XRF sampel menunjukkan bahwa kemampuan pertukaran kation sampel montmorillonit K-10 terhadap Ni2+ berdampak pada peningkatan kandungan nikel pada semua sampel yang dimodifikasi dibandingkan dengan yang tidak dimodifikasi. Analisis XRD terhadap struktur sampel yang dimodifikasi mengungkapkan bahwa struktur dasar clay 2:1 (T:O:T) tahan selama proses pertukaran kation. Kinerja katalis heterogen yang dihasilkan diuji pada reaksi transesterifikasi minyak jelantah dengan metanol untuk produksi FAME (Fatty Acid Methyl ester) (biodisel). Evaluasi uji katalitik menunjukkan bahwa montmorillonit K-10 yang dimodifikasi Ni2+ memberikan peningkatan % rendemen FAME. Hal ini mengindikasikan bahwa material montmorillonit K-10 yang dimodifikasi  Ni2+sebagai katalis heterogen yang berpotensi untuk produksi biodisel.
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; Deswita, Elvira
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.
Co-Authors A.A. Ketut Agung Cahyawan W Angellika, Florencia Tri Deswita, Elvira Fitria Ramadhani Isnaini, Delvi Khoiriah, Dewi Khofifatul Mega Mustika Reshiva, Reshiva Syukri Syukri Yetria Rilda