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Jurnal Periodic Jurusan Kimia UNP
Published by Universitas Negeri Padang
ISSN : -     EISSN : 23391197     DOI : https://doi.org/10.24036/p.v11i2.113715
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
Periodic adalah jurnal nasional yang berisi artikel-artikel bidang ilmu kimia, seperti bidang Kimia Analitik, Kimia Fisika, Kimia Anorganik, Kimia Organik dan Biokimia. Jurnal ini mempublikasikan hasil penelitian original, komunikasi singkat, dan artikel review. Artikel yang telah diterbitkan dalam jurnal ini berarti bahwa kegiatan penelitian yang diterbitkan adalah belum, dan tidak akan diterbitkan di tempat lain. Periodic (e-ISSN 2339-1197) diterbitkan oleh Jurusan Kimia dan mulai tahun 2022 disebut Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Padang, Indonesia. Periodic terbit berdasarkan berdasarkan surat edaran Direktorat Jenderal Pendidikan Tinggi No. 152/E/T/2012 tentang publikasi karya tulis ilmiah dan terbit sejak Oktober 2012.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 20 Documents
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Search results for , issue "Vol 13, No 3 (2024): PERIODIC" : 20 Documents clear
Identifikasi Mikroplastik Polypropylene (PP) Menggunakan Metode Wet Peroxide Oxidation (WPO) Afriyani, Ratih; Dewata, Indang
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.v13i3.125645

Abstract

Microplastics are plastic waste smaller than 5 mm. The small size of microplastics raises concerns for living creatures because microplastics are very dangerous and widespread in the environment. Polypropylene (PP) microplastics are the most widely used synthetic microplastics. This research was carried out with the aim of finding out the optimum conditions for a method for identifying PP microplastics from waters. This method is Wet Peroxide Oxidation (WPO) because conceptually it is cheaper and simpler. In this research, stages of optimizing oven and heating times and H2O2 concentrations will be carried out to obtain optimal microplastic identification results. Identification uses a stereo microscope to see the shape and color of microplastics, determine the chemical composition from the spectrum which is measured using Fourier Transform Infrared (FTIR) and analyze the material composition and determine the composition of all types of chemicals from plastic particles using X-Ray Fluorescence (XRF). The results of microplastic separation using this method were optimal at an oven time of 18 hours, H2O2 concentration of 30% and heating time of 35 minutes. The results of identification using a microscope showed that the identified microplastics were fragment type microplastics, the colors of the microplastics were transparent and black. The characteristics of functional groups using FTIR show the optimum loss of impurities in the sample. For the XRF test there are additives and heavy metals absorbed from the environment.
Pengaruh Penambahan Zat Aditif Polyvinyl alcohol (PVA) Terhadap Kualitas Plastik Biodegradable Berbasis Selulosa Bakteri-Gliserol Dari Air Kelapa (Cocos nucifera) Reni, Fatina Rahmi Alamsyah; Putra, Ananda
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.v13i3.125640

Abstract

Biodegradable plastics are plastics that can be decomposed or easily degraded by the activity of microorganisms. The aims of this study is to determine the effect of adding concentration variations of Polyvinyl alcohol additives to biodegradable plastics and determine the characteristics of the physical, mechanical and biodegradation of biodegradable plastics. This study used 3,5% glycerol as a plasticizer with PVA mass variations, namely 2 gr, 4 gr, 6 gr and 8 gr. The physical properties test results obtained, namely the percentage content and swelling test values, decreased as the mass of PVA was added. The optimum results of the characteristics of the mechanical properties of plastic are the addition of 8 gr PVA with a tensile strength value of 126.71 MPa, elongation of 4.19% and elasticity of 290.14 MPa. In biodegradation testing, tests were carried out on SB, SBG and SBG-PVA samples where with the addition of PVA the plastic degraded more slowly. Characteristics of functional groups using FTIR showed that no new functional groups were formed and the characteristics of plastic crystallinity using XRD for pure SB plastic were 63.68%, SBG was 67.94%, and SBG-PVA was 89.03%.
Sintesis dan Karakterisasi Fotokatalis Hierarchical Porous TiO2/Cu (HPT/Cu) dengan Metode yang Ramah Lingkungan Syawal, M Ichlas; Suryani, Okta
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.v13i3.125637

Abstract

Most of the energy consumed comes from non-renewable fossil fuel resources. Therefore, renewable and environmentally friendly energy resources are needed, namely sunlight. One way to utilize sunlight is to store it into hydrogen compounds. Hydrogen comes from water through a process of breaking down its molecules which is called water decomposition. Water decomposition uses sunlight and a semiconductor photocatalyst, such as TiO2. In this research, TiO2 has been synthesized whose morphological structure has been modified (Hierarchical Porous TiO2) and doped with Cu metal to reduce the band gap. Hierarchical Porous TiO2 (HPT) has been successfully synthesized. XRD characterization to determine the structure and size of the particles. HPT has an anatase crystal structure with an average particle size of 19.24 nm. HPT has an energy band gap of 3.25 eV. Then doping with Cu metal causes the band gap to decrease to 2.79 eV. Metal doping has been proven to reduce the band gap energy of the HPT semiconductor photocatalyst
Pengaruh pH dan Konsentrasi Ampas Kulit Durian (Durio Zibethinus L.) Terhadap Penyerapan Ion Logam Tembaga (II) dengan Metode Batch Bastian, Vadianda; Nasra, Edi
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.v13i3.125459

Abstract

One of the effective methods in handling the impact of pollution by copper metal is the biosorption method using durian peel powder (Durio Zibethinus L.). The purpose of this research is to determine the optimum absorption conditions and the optimum capacity for absorption of copper metal ions (Cu2+) using the batch method with variations in pH, concentration, stirring speed, contact time, and mass of biosorbent. The results of the research showed that the optimum conditions for the absorption of Cu2+ metal ions were at pH 6, concentration of 220 ppm, stirring speed of 250 rpm, contact time of 90 minutes and mass of biosorbent 0,4 gram was 7,788 mg/g. The adsorption isotherm of Cu2+ metal with durian skin biosorbent (Durio Zibethinus L.) tends to follow the Langmuir isotherm equation with a determinant coefficient (R) of 0,1854. Durian peel powder was characterized by the FTIR instrument, before being activated, after being activated, and after contacting the analyte there were functional groups, namely hydroxyl (O-H), alkene (C=C), carbonyl (C-O), and ether (-COC) groups.  
Sintesis dan Karakterisasi TiO2/Zn Dengan Metode Yang Ramah Lingkungan Rahimmah, Nur; Suryani, Okta
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.v13i3.125790

Abstract

The increasing use of fossil fuels leads to increased carbon emissions from the combustion process of fossil fuels. Therefore, sustainable and environmentally friendly alternative energy sources are needed as a substitute for fossil fuels. Hydrogen is one of the potential substitutes for fossil fuels because it has the highest energy density and is environmentally friendly. Hydrogen can be produced through photochemical water splitting by utilizing solar energy and abundant water resources. Hydrogen production through photochemical water splitting in the process uses TiO2 semiconductor material as a photocatalyst. This research has been synthesized and characterized TiO2 and TiO2 photocatalysts doped with Zn metal to reduce the band gap. TiO2 has an anatase crystal structure with an average particle size of 27,07 nm. TiO2 band gap is 3,27 eV.  Then doping with Zn metal and causes the band gap energy to decrease to 3,20 eV. Metal doping is proven to reduce the band gap energy of TiO2 semiconductor photocatalyst.
Pengaruh Penambahan Zat Aditif Virgin Coconut Oil (VCO) Terhadap Kualitas Plastik Biodegradable Berbasis Selulosa Bakteri –Gliserol dari Air Kelapa (Cocos nucifera) Yudelta, Oltry; Putra, Ananda
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.v13i3.125605

Abstract

Biodegradable plastic is environmentally friendly plastic because it is easily degraded by microorganisms. This research aims to see how much influence the addition of virgin coconut oil additives has on the quality of bacterial cellulose-Glycerol based biodegradable plastic from coconut water (Cocos nucifera) which includes physical properties test (moistur content and swelling test), mechanical properties test (tensile strength, elongation and elasticity) and biodegradation test. This research uses 3.5% Glycerol as a plasticizer with varying volumes of virgin coconut oil, namely 2 mL, 4 mL, 6 mL and 8 mL. The results of the physical properties test obtained are that the % moisture content and swelling test decreases as the volume of virgin coconut oil increases. The maximum results from mechanical properties testing obtained a tensile strength value of 118.97 MPa with variations in the addition of 6 mL virgin coconut oil, where the tensile strength value already complies with the SNI standard for synthetic plastics, namely in the range 24.7-302 MPa, , the elastic value obtained is 3571.15 MPa, and the elongation value is 5.28%. For the biodegradation test, the plastic that was added with virgin coconut oil experienced a decrease but on the 15th day this plastic has fully degraded.
Sintesis dan Karakterisasi Fotokatalis TiO2/Zn dengan Asam Askorbat Sebagai Reduktor Anastasya, Wulanda; Suryani, Okta
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.v13i3.125853

Abstract

Hydrogen gas (H2) is a promising alternative energy source compared to fossil fuels because it is abundant, highly efficient, non-toxic, and produces no harmful emissions when used as fuel. H2 gas can be produced with a simple, inexpensive, and environmentally friendly process, for example through photocatalytic water splitting by photocatalysts with the help of sunlight. One of the semiconductors as a photocatalyst can absorb sunlight for photocatalytic water splitting is TiO2. In this study, TiO2 has been synthesized whose morphological structure has been modified (Hierarchical Porous TiO2) and doped with Zn metal to reduce the band gap. Hierarchical Porous TiO2 (HPT) has been successfully synthesized. XRD characterization was used  to determine the structure and particle size. HPT has an anatase crystal structure with an average particle size of 19.24 nm. HPT has an energy band gap of  3.25 eV. Then doping with Zn metal reduce the band gap to 2.91 eV. Metal doping is proven to be able to increase the light absorption of HPT from 300 nm to 600 nm in the visible light region. Characterization results show that Zn doping is able to reduce the band gap of HPT semiconductor photocatalyst.
Pengaruh Lebar dan Ketebalan Komposit C/CuO Berbasis Karbon Aktif Pelepah Kelapa Sawit Terhadap Karakteristik Material Termoelektrik Novriansyah, Edo; Putra, Ananda; Azhar, Minda; Nizar, Umar Kalmar
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.v13i3.125697

Abstract

Abstract -Electrical energy is energy that is really needed by humans, one way to save electrical energy is to use the thermoelectric method. Thermoelectric materials are materials that can convert heat energy into electrical energy through the Seebeck effect. This research aims to determine the effect of the size of the Active Carbon/Cuo composite material with a high Seebeck coefficient and apply it as a thermoelectric generator. In this study, variations in the size of the mold material were carried out with thickness (0.5 0.8 1 1.3 and 1.5) cm, width (1 1.3 1.6 2.5) and length 5 cm. From the research results, it can be seen that materials with sizes of 0.5 cm and 1 cm have the highest thermal conductivity, namely 0.195 mS.cm-1 and 0.0964 mS.cm-1, the lowest thermal conductivity is 0.06J/s and 0.08J/s, and the highest electrical voltage (Seebeck effect), namely 0.02 mV/K and 0.012 mV/K. Furthermore, applying this material to a generator is capable of producing an electrical voltage of 1.7V at a temperature of 80℃.
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

Abstract

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%.
Pengaruh Variasi Ukuran Ketebalan Material Terhadap Karakteristik Termoelektrik Sistem C/CuO Sari, Putri Manda; Putra, Ananda; Zainul, Rahadian; Sanjaya, Hary
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.v13i3.125603

Abstract

One of the factors that can affect the quality and characteristics of thermoelectric materials is the size of the material.. This study aims to determine how the effect of material size is varied in width and thickness. The material used is activated carbon obtained from previous research that has met the SNI No. 06-3720-1995 content test. The activated carbon is then composited with Copper (II) Oxide. Based on the tests that have been carried out, the best material obtained is the material with a thickness size variation of 0.5 cm. With a high electrical conductivity value of 0.9507 MΩ-.cm-, low thermal conductivity of 0.1805 J/s and has a high Seebeck coefficient of 0.020 mV/K. Thermoelectricity offers sustainable energy to maintain energy needs, namely by converting wasted heat energy into electrical energy that can overcome the current global warming problem.

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