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All Journal Jurnal Periodic Jurusan Kimia UNP JURNAL PENDIDIKAN TAMBUSAI Sainstek : Jurnal Sains dan Teknologi

Deski Beri

Universitas Negeri Padang

Author-ID : 5345705

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Energy Materials Science & Nanotechnology Social Sciences Other

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STUDI ab-initio MEKANISME PEMBENTUKAN TRANSISI REAKSI OKSIDASI CO OLEH NO2 DI UDARA Beri, Deski
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

The transition state formation?s mechanism of CO oxidation reaction by molecule of NO2 has been done using ab-initio computation by Density Functional Theory (DFT). Geometry optimation was done by B3LYP and 6-31G* basis set using HyperGauss and HyperDFT computer software. The result is we hypothese that there was three transition state takes place, therewere trans-Transition State (KTt), cis-Transition State (KTc) and cyclic-Transition State (KTs). All of three was gradually takes place in a very short time intervals. Keywords: density functional theory (DFT), geometry optimation, intermediate, transition state

Sintesis Keramik Refraktori Al2O3.MnO2.SiO2 Dengan Metoda Sol-Gel dan Sifat Fisikanya Dalam Berbagai Temperatur Kalsinasi Rahmi Muthia; Deski Beri; Ali Amran
Jurnal Periodic Jurusan Kimia UNP Vol 2, No 1 (2013)
Publisher : Departemen Kimia FMIPA UNP

Ceramic oxide Al2O3.MnO2.SiO2 ceramics has relatively high strength, tough electrical capacitance and temperature resistant. It’s synthesized by sol-gel methods using raw materials Tetraethyl Orthosilicates (TEOS), Al (NO3) 3.9H2O and Mn (NO3) 2.4H2O with calcination temperature variation of 900-1100oC. XRD (X-Ray Diffraction) analysis of ceramic Al2O3.MnO2.SiO2 showes peak °2Th=33.2875 intensity relatif=100%, °2Th=55.8688 intensity relatif 24,28%,°2Th=26.1289 intensity relatif 13,22%,°2Th=66.4815 intensity relatif 12,84%,°2Th=35.4375 intensity relatif 11,39%. Ceramic Al2O3.MnO2.SiO2 morphology by SEM (Scanning ElectronMicroscopy) showed that the ceramic at a temperature of 1100oC was homogeneous microscopic. Capacity as measured by the LCR meter instrument empirical equation F (C, T) = 0.01625 T - 11.0833 can be explained that the higher the calcination temperature the higher the value of the capacitor capacity.

Degradation of Methyl Green Dyes with ZnO Catalyst using the Photosonolysis Method Muhammad Gani Ariski; Hary Sanjaya; Alizar Alizar; Deski Beri; Yohandri Yohandri
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 2 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Textile and dyestuff industrial dye waste remain the most difficult wastewater to treat due to the complex aromatic molecular structure of industrial dyes, which are very difficult to decompose. This research was conducted on the degradation of methyl green using the photosonolysis method. The purpose of this study was to determine the optimum time and amount of ZnO used in degrading methyl green dye. The results of the percentage degradation were obtained from the absorbance value measured using a UV-Vis Spectrophotometer. (λmax) Methyl green obtained from the measurement of a UV-Vis spectrophotometer was 640 nm. The results showed that the optimum irradiation and sonication time to degrade methyl green was 60 minutes with a degradation percentage of 92.77%. For the effect of mass variation of ZnO catalyst obtained the optimum mass of 0.05 grams with a degradation percentage of 96.38%.

Pengaruh Penambahan Konsentrasi (NH2)2CO Terhadap Karakteristik TiO2 dan Aktifitas Fotokatalitiknya Dalam Mendegradasi Methylene Blue Novera Elsi Mudia; Rahadian Zainul; Deski Beri; Syamsi Aini
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 2 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Titanium dioxide (TiO2) is a semiconductor material that is often applied as a photocatalyst. TiO2 has a band gap of 3.20 eV which is less effective when used in visible light. Nitrogen dopants are dopants that have high effectiveness to improve the performance of TiO2 in the visible light region. This study aims to determine the effect of adding nitrogen dopant concentration on the characteristics of TiO2 and its photocatalytic activity in degrading methylene blue. The photocatalytic activity of TiO2-N was tested with 10 ppm methylene blue under sunlight for 1 hour. The addition of dopants to the TiO2 matrix has an effect on the band gap and photocatalytic activity of TiO2

Isolasi dan Karakterisasi Î±-Selulosa Dari Kulit Buah Matoa (Pometia pinnata) Fauzan Aulia Akbar; Edi Nasra; Desy Kurniawati; Deski Beri; Hary Sanjaya
Periodic Vol 12, No 2 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i2.117793

Cellulose isolation from the matoa fruit peel (Pometia pinnata) has been carried out by means of acid hydrolysis and alkaline hydrolysis. The purpose of this study was to isolate cellulose in the peel of matoa fruit and determine what is the purity level of cellulose contained in the peel of matoa fruit, FTIR is used to identify cellulose functional groups in matoa fruit peel. Results of this study, an yeild of the results of cellulose isolation of matoa peel was 41.3% with the purity level of cellulose of matoa fruit peel of 47.63%. The results of characterization using FTIR are known to have cellulose groups contained in the matoa peel such as -OH, -CH, and C-O groups which are the main functional groups in cellulose.

Efektifitas ZnO doping TiO2 Dalam Mendegradasi Zat Warna Metil Hijau dengan Metode Fotolisis Alfarisi, Fadil; Sanjaya, Hary; Beri, Deski; Etika, Sri Benti
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.118598

The textile industry sector in Indonesia is progressing. This progress is not followed by good and effective waste management. Methyl green dye waste is one example. Methyl green is organic waste that is difficult to decompose and is toxic. Therefore, an effective method is needed to decompose organic waste into environmentally friendly compounds using the photolysis method. This study aims to obtain the optimum time and the optimum concentration of TiO2 doping on the degradation of Methyl green by photolysis. The percentage of degradation of Methyl green was obtained from the measurement of the absorbance value using a UV-Vis spectrophotometer at the maximum wavelength of Methyl green (λmax) and the maximum wavelength was obtained at 640 nm. The results are the optimum time of degradation of Methyl green dye at radiation time of 150 minutes with a degradation percentage of 97.5%. In the variation of TiO2 dopant concentration, the optimum concentration of TiO2 dopant was found at 10% ZnO-TiO2 with 95% degradation.

Pengaruh Suhu Kalsinasi Sekam Padi Terhadap Produksi Silika (SiO2) Althof, Hasna Sausan; Beri, Deski
Periodic Vol 13, No 2 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i2.124627

Rice husk is a leftover material from the rice milling process and is known to have a high silica (SiO2) content. In this study, rice husk was calcined with temperature variations of 800℃, 850℃, and 900℃ to see the effect on the ash content produced. The ash obtained becomes whiter as the calcination temperature increases. The darker ash color indicates that there is still carbon content. In this study, silica was extracted using NaOH 10% and precipitated with HCl 10%. The synthesized silica was characterized using XRF. The results of the analysis using XRF revealed that the optimum calcination temperature was obtained at 900℃ which produced the highest silica yield of 96.32% with silica purity (SiO2) reaching 70.307%.

Sintesis dan Karakterisasi Magnetik Kuantum Dot Fe3O4 Dengan Metode Kopresipitasi Hamid, Abdul; Isnaeni, Isnaeni; Amran, Ali; Beri, Deski
Periodic Vol 13, No 2 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i2.124698

The unique properties of the magnetic quantum dot Fe3O4 make it widely synthesized by different methods and applied in the biomedical field. The synthesis method plays an important role in determining the optical properties of the magnetic quantum dot Fe3O4. This study aims to determine the magnetic synthesis of quantum dot Fe3O4 coated with oleic acid by coprecipitation method. Quantum dot Fe3O4 magnetic synthesis method by coprecipitation using oleic acid for functionalization of Fe3O4 quantum dot magnetic. The results of the FTIR analysis showed five main absorption bands namely O-H, C-H, C=C, C-O, and Fe-O which indicated that the magnetic quantum dot Fe3O4 was successfully functionalized with oleic acid.

Sintesis Tetraetil Ortosilikat (TEOS) dari Silika Hasil Kalsinasi Sekam Padi Rahmi, Rahmi; Nizar, Umar Kalmar; Khair, Miftahul; Althof, Hasnah Sausan; Azzahra, Wenalda Hanifah; Beri, Deski
Periodic Vol 13, No 3 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i3.125501

Indonesia is an agricultural country. Where agriculture makes an important contribution to the economy and the fulfillment of people's basic needs. It is known that every 1 kg of rice produced, is able to produce 0.28 kg of rice husk. Rice husk is an agricultural waste that is abundant in nature. In this research, the effect of calcination time on silica obtained from rice husk has been determined. The purity level of the extracted silica is 99%. Silica that has been successfully extracted is then used in the TEOS synthesis process by varying the reaction time. A total of 1 mole of ethanol (58.4 ml) and 0.25 ml (7 grams) of silica powder were added to 250 ml neck flask 3 and the addition of alumnia catalyst as much as 1 gram, then the mixture was refluxed using 800C for 5, 7, 10, 15 and 20 hours. The TEOS obtained was then subjected to several parameter tests that provide information about the physical and chemical conditions, so that this can provide information regarding the quality of the resulting solution. The measurements carried out are, Densiats solution testing, Viscosity and refractive index. From the data obtained the density value of TEOS is 0.986 g/ml - 0.995 g/ml, the viscosity value of TEOS is 0.8176 cps - 0.9337 cps and the refractive index value of TEOS is 1.356 - 1.360. While the yield obtained is from 82.11% - 54.74%.

Sintesis Silikon dari Silika (SiO2) Menggunakan Metode Reduksi Hidrotermal Azzahra, Wenalda Hanifah; Beri, Deski; Aini, Syamsi; Parbuntari, Hesty
Periodic Vol 13, No 3 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i3.125787

Silicon is one of the materials whose utilization is getting bigger along with the times. Hydrothermal reduction method is one of the methods that can be done to synthesize silicon from natural materials because silicon does not exist freely in nature. The purpose of this research is to synthesize silicon using hydrothermal reduction method. The precursor used in the reduction process is silica (SiO2). The metal used as a reductant is magnesium metal and the molten salt that can be used is AlCl3. The reduction process is carried out by varying the reduction temperature to see the degree of crystallinity of silicon formed. Silicon formed is seen at the peak of 28.44, 47.30, 56.11, 69.13 dan 76.38.

Co-Authors Abdul Hamid Aini, Syamsi Alfarisi, Fadil Ali Amran Ali Amran Althof, Hasna Sausan Althof, Hasnah Sausan Augesta Sihombing, Yolanda Azzahra, Wenalda Hanifah Desy Kurniawati Edi Nasra Fadila, Nelma Fauzan Aulia Akbar Hary Sanjaya Hary Sanjaya Ikhza Wafiyah, Evelyna Indah Putri, Juvani Isnaeni Isnaeni Jamila Turrahmi, Monika Miftahul Khair Muhammad Gani Ariski Mulyani, Dian Nizar, Umar Kalmar Novera Elsi Mudia Parbuntari, Hesty Rahadian Zainul Rahmi Muthia Rahmi Rahmi Sri Benti Etika Syamsi Aini Ulianas, Alizar Yohandri

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