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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 343 Documents
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Esterifikasi Palm Fatty Acid Distillate Menggunakan Katalis Karbon Kulit Buah Kakao (Theobroma Cacao) Tersulfonasi Agustin, Andre; Nizar, Umar Kalmar
Periodic Vol 13, No 1 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i1.120001

Abstract

Catalyst is a substance that plays an important role in biodiesel production because the reaction for biodiesel formation is slow. This catalyst can be synthesized by utilizing organic waste such as cocoa pods. This study aimed to study the physicochemical properties and catalytic activity of sulfonated cocoa pod carbon catalyst for biodiesel production from PFAD. This catalyst was synthesized through a calcination process at temperatures of 250 0C, 300 0C, 350 0C, 400 0C, 450 0C for 1 hour and sulfonation with H2SO4 p.a then characterized using FTIR, XRD, and acid site test. The catalyst is then applied in the manufacture of biodiesel through an esterification reaction between PFAD and methanol with a mole ratio of 1:15. The biodiesel produced was tested for its physicochemical properties in the form of density test, flow rate, acid number, and percent conversion. The results showed that the highest number of carbon catalyst sites for cocoa pod shells was KKBK-450. Based on the FTIR analysis, there are absorption bands at wave numbers of 1036 cm-1 and 1181 cm-1 indicating the presence of an O=S=O group which proves that the sulfonate group was successfully substituted onto the carbon surface of the cocoa pod. Characterization using XRD showed the results in the form of a carbon catalyst of cocoa pods having an amorphous structure. Based on the test results of the physicochemical properties of the catalyst from the biodiesel produced, KKBK-450 showed the optimum catalytic activity with the percent conversion of FFA to FAME of 52.28%.
Optimasi Metode Ekstraksi Mikroplastik Polivinil Klorida (PVC) Dengan Wet Peroxide Oxidation (WPO) Deliani, Nur Farida; Dewata, Indang
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.v13i2.125423

Abstract

The increase in plastic production causes an increase in plastic waste in the environment both on land and in waters. Over time, plastic waste will degrade into microplastics in waters. Microplastics in waters are contaminated with organic impurities which can interfere with the identification of microplastics. The method for extracting plastic particles from organic impurities is using wet peroxide oxidation. However, these methods have not been systematically tested and standardized. This research aims to determine the optimum conditions for the extraction method with the addition of wet peroxide oxidation for the identification of PVC microplastics. In this research, a 30% hydrogen peroxide solution was used as an oxidizer and a Fe2+ catalyst as the main ingredient to produce OH radicals which function to oxidize organic impurities and the samples used were PVC microplastics made from grinding PVC plumbing pipes. Determination of optimum conditions was carried out at varying oven temperatures of 70oC, 80 oC, 90 oC, 100oC, dan 110oC, varying concentrations of 0,025 M; 0,05M; 0,075M; 0,1M dan 0,125M and temperature variations at heating 30oC, 45oC, 60oC, 75oC, dan 90oC, as well as testing the optimum extraction method on water samples with water volumes ranging (200, 400, 600, 800, and 1000) mL. The research results showed that the optimum conditions were an oven temperature of 90oC, a Fe catalyst concentration of 0.075M, and a heating temperature of 75oC in the PVC microplastic extraction process resulting in a PVC microplastic mass of 0.3403 grams. Characterization of PVC microplastics was carried out using Primostar 1, FTIR and XRF microscope instruments. Tests using a microscope showed that the form of PVC microplastic was identified, namely fragment form. In the FTIR test, CH2, C-Cl, C-C  peaks were obtained which indicated that the polymer was a type of PVC, apart from that there were N-H bend dan N-H stretching  peaks which indicated the material. The organic impurities are in the form of amine, and in XRF testing the additive elements that make up PVC microplastics are obtained, namely Si, P, Ca, V, Cu, Br, Sr.
Pengaruh Variasi NaOH Pada Polimerasi Kuersetin Terhadap Efisiensi DSSC Hijri, Fadhillah; Hardeli, Hardeli
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.v12i3.118622

Abstract

Dye-sensitive solar cells are third-generation solar cells that convert photon energy into electrical energy. DSC solar cells use dyes to increase efficiency. The dye used is polymerized first to increase the amount of π -π* so that more photons are absorbed and efficiency increases. The dye used in this research is quercetin which is polymerized with a glutaraldehyde crosslinking agent. Quercetin polymerization can be influenced by several factors, one of which is NaOH which acts as an initiator. NaOH plays a role in opening the epoxy ring so that the polymer chain gets longer. ITO glass is coated with TiO2 electrodeposited with ZnO. The results of the measurement of the highest efficiency were found in the 1% NaOH of 8.33% with a density of 0.52 g/cm3 and a degree of polymerization of 3.05
Analisis Beberapa Sifat Fisikokimia dari Minyak Goreng Kemasan Hasil Penggorengan Ubi Jalar (Ipomea batatas) Sabrina, Joya; Dewata, Indang; Oktavia, Budhi; Pernadi, Niza Lian; Farhan, Muhammad; Rahmi, Fathaniah Raviqa; Nizar, Umar Kalmar
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.v13i2.124356

Abstract

Cooking oil is a biological mixture derived from plants and consists of a mixture of esters derived from glycerol with fatty acids. The most commonly used cooking oil for cooking by the community is palm oil, because it is easy to obtain and the price is relatively affordable. The main composition of palm oil is triglycerides more than 95% and several other components such as monoglycerides, diglycerides, free fatty acids, phosphatides and sterols. Sweet Potatoes have the main content, namely carbohydrates. In addition to carbohydrates, there are other ingredients such as protein and fat. The purpose of this study was to determine the physicochemical properties of packaged cooking oil from sweet potato frying at a certain time and temperature and to use packaged cooking oil without heating as a comparison. The physicochemical properties of the oil determined include density, flow rate, acid number and saponification number. Bimoli cooking oil from sweet potato frying has a density value of 0.9369 gr/ml, a flow rate of 3.662 ml/s, an acid number of 8.143 mgKOH/gr and a saponification number of 14.305 mgKOH/gr. The results of this study indicate that the results of the physicochemical properties test of packaged cooking oil have a better value than the test results of sweet potato frying oil.
Skrining Fitokimia Ekstrak Metanol Dari Kulit Buah Salak (Salacca zalacca) Fadhila, Dina; 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.v12i3.117968

Abstract

Salacca zalacca atau yang disebut dengan snakefriut merupakan salah satu tanaman yang termasuk dalam keluarga palma. Salah satu bagian tanaman ini yang dapat dimanfaatkan adalah gorong-gorong buah. Kulit buah salak ini bisa dimasak sebagai minuman yang bisa menjadi obat penyakit diabetes. Pada penelitian ini dilakukan skrining fitokimia untuk mengidentifikasi senyawa metabolit sekunder yang terkandung pada kulit buah salak (Salacca zalacca). Hasil skrining fitokimia kulit buah salak menunjukkan bahwa kulit buah salak (Salacca zalacca) mengandung metabolit sekunder alkaloid, flavonoid dan saponin, tetapi tidak mengandung terpenoid dan steroid.
Pengaruh Penjernihan Minyak Jelantah Menggunakan Nasi Terhadap Sifat Fisikokimia Minyak Sidiq, Aqil Marsya; Putra, Ananda; Amelia, Fitri; Pernadi, Niza Lian; Rizki, Suci Yulia; Nizar, Umar Kalmar
Periodic Vol 13, No 1 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i1.124355

Abstract

The increased demand for cooking oil has led to a corresponding rise in its consumption. To address this situation, individuals often resort to reusing cooking oil, despite its unsuitability for consumption. The repeated use of cooking oil at high temperatures induces the hydrolysis of triglycerides into free fatty acids. Consequently, this research aims to refine the quality of used cooking oil through its purification using rice, rendering it suitable for reuse. Rice is rich in amylose and amylopectin, both of which feature -OH groups that can interact with -COOH groups present in free fatty acids within used cooking oil. In the process of used cooking oil purification, rice serves as an adsorbent. The findings of this study exhibit an improvement with an increase in the amount of rice used in the purification of cooking oil. Furthermore, the utilization of rice as an adsorbent during the cooking oil purification process leads to a reduction in density to 0.9454 g/mL, a decline in the acid number to 2.0797 mg KOH/g, an augmentation of flow rate to 0.3141 mL/s, and an elevation of the hoarding number to 77.1842 mg KOH/g within the used cooking oil.
Pengaruh Supporting Electrolyte pada Penentuan Formaldehida secara Voltametri Siklik Menggunakan Au/MWCNT/GCE Annisa, Ananda Suci; Sari, Trisna Kumala; Dewata, Indang; Khair, Miftahul; Suryani, Okta
Periodic Vol 13, No 1 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i1.124524

Abstract

Formaldehyde was detected electrochemically using a modified glassy carbon electrode with a multi-walled carbon nanotube (MWCNT) and a thin layer of gold (Au). Modification of MWCNT was carried out by drop coating, while modification of the thin layer of gold was carried out by sweeping-potential electrodeposition using the cyclic voltammetry method. The purpose of this study was to develop a formaldehyde sensor using Au/MWCNT/GCE and to determine the optimum conditions of the supporting electrolyte for formaldehyde measurement. The results showed that Au/MWCNT/GCE provided better catalytic activity than GCE, MWCNT/GCE and Au/GCE electrodes in the determination of formaldehyde. The optimum supporting electrolyte obtained was KOH with a test analyte concentration of 10 mM. The oxidation peak of formaldehyde I is at a potential of 0.0264 V and peak of oxidation of formaldehyde II is at a potential of 0.075 V.
Optimasi Ekstraksi Mikroplastik Polystyrene (PS) Dengan Wet Peroxide Oxidation (WPO) Fatma, Winda Faulina; Dewata, Indang; Mulia, Melindra; Alizar, Alizar
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.v13i2.125407

Abstract

Plastic pollution is a global problem that is very dangerous if not handled appropriately and systematically. These plastics can enter the environment and will degrade into microplastics due to environmental factors such as light, temperature and humidity. Microplastics are degraded plastics with a size of <5 mm. This microplastic is very dangerous if ingested by living creatures. One of the impacts can cause digestive disorders, cancer and many more. The aim of this research is to obtain an appropriate method for extracting polystyrene microplastics from water samples. The method used is the WPO (wet peroxide oxidation) extraction method. This method uses two solutions, namely Fe(II) 0,05 M as a catalyst to accelerate the oxidation reaction of impurities and H2O2 30% as an OH• producing material which function to oxidize impurities. In the procedure, variations in Fe(II) concentration and heating temperature were carried out. The optimum results obtained were Fe(II) 0,075 M and a heating temperature of 75°C. Apart from that, microplastic characterization was also carried out using FTIR (Fourier Transform InfraRed). Characterization using FTIR shows that the specific functional groups possessed by polystyrene are C-H bending, C=C stretching and C-H stretching at wave numbers 758 cm-1, 1600,97 cm-1 and 2931,90 cm-1, respectively.
Pengaruh Waktu Kontak dan Kecepatan Pengadukan Terhadap Penyerapan Ion Logam Pb2+ Menggunakan Biosorben Kulit Buah Naga Merah (Hylocereus polyrhizus) Fitri, Nur; Kurniawati, Desy
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.v12i3.119565

Abstract

The Pb2+ ion is the most common and highly toxic metal ion that can be found in industrial waste. if it enters a water body, it will be difficult to degrade and easily accumulate in the body of organisms. This study aims to reduce the impact of Pb2+ ion pollution in the waters. The biosorption method was chosen in batches by utilizing plantation waste, namely dragon fruit peel as a biosorbent in the absorption of Pb2+ ions, because it is cheap, safe, and effective. Dragon fruit peel contains lignin and cellulose which contain active groups so that it ispotential to be used as a biosorbent. The result showed that the dragon fruit peel adsorbent was able to absorb Pb 2+ ions at an optimum contact time 70 minutes with a stirring speed of 200 rpm which was analyzed using an atomic absorption with the highest absorption capacity of 32,74 mg/g.
Pengaruh pH dan Konsentrasi Terhadapa Penyerapan Ion Logam Besi (Fe) Menggunakan Selulosa Hasil Ekstraksi Dari Kulit Durian (Durio Zibethinus Murr) Burma, Resna; Nasra, Edi; Oktavia, Budhi; Ningsih, Sherly Kasuma Warda
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.v13i2.124652

Abstract

Fe(II) Metal Ions are one type of heavy metal that is toxic resulting in pollution in the environment. In waters if Fe(II) ion exceeds the limit of 0.3 mg / L will cause damage to the ecosystem and the surrounding environment, so countermeasures are needed from pollution caused by Fe(II) ions. Biosorption using cellulose biosorbents extracted from durian fruit peel was chosen as one of the efficient methods. The purpose of this study can determine the absorption capacity of durian fruit peel and determine the optimum conditions for absorption of Fe (II) metal ions carried out by batch method with variations in pH and concentration. The optimum pH of Fe (II) metal ion absorption was obtained at pH 5 and an optimum concentration of 250 ppm with an absorption capacity of 4.3 mg / g.

Page 29 of 35 | Total Record : 343

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