cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Budhi Oktavia
Contact Email
budhioktavia@fmipa.unp.ac.id
Phone
-
Journal Mail Official
periodic@fmipa.unp.ac.id
Editorial Address
Departemen Kimia, FMIPA, UNP Jalan Prof. Dr. Hamka, Air Tawar, Padang, Sumatera Barat
Location
Kota padang,
Sumatera barat
INDONESIA
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
 28   29   30   31   32 
Skrining Fitokimia Ekstrak Metanol Dari Daun Jati Belanda (Guazuma ulmifolia) Yuliandari, Fadhira; Parbuntari, Hesty
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.v12i3.118434

Abstract

Dutch teak (Guazuma ulmifolia) is a plant that belongs to the family Sterculiaceae and grows in Ecuador, Panamaa, and other American Latin countries. This Dutch teak is found in bushes, as well as in forests. This Dutch teak plant is often the most needed for health, especially the leaves. Dutch teak leaves have been used as traditional medicine to maintain a healthy body, lose weight as a slimming herb, to lowers cholesterol levels in the body. Research has been done phytochemical screening to determine the secondary metabolites contained in Guazuma ulmifolia. Phytochemicals test results showed that Guazuma ulmifolia contains secondary metabolites in the form of flavonoids, steroids, alkaloid, and saponins.
Adsorpsi Ion Ca2+ Menggunakan Adsorben Silika GPTMS Termodifikasi Sulfonat Putri, Reza Athia; Oktavia, Budhi; Alizar, Alizar; Parbuntari, Hesty
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.v13i2.124505

Abstract

Silica is a metal oxide compound that is widely found in nature and is used as an adsorbent. Silica has the ability to adsorb ions because it has two groups of active sites that can be modified, namely siloxane (Si-O-Si) and silanol (Si-OH) groups. This modification was made to increase the ability of silica to absorb ions, one of which is the metal ion Ca2+. Silica modification was carried out by adding a bridging compound, namely glycidoxypropyltrimethoxysilane (GPTMS). The purpose of this research was to determine the optimum conditions of pH, contact time, and adsorption concentration of Ca2+ metal ions on sulfonate-modified GPTMS silica using batch method. The filtrate resulting from adsorption was analyzed using an atomic absorption spectrophotometer (AAS). The results showed that the optimum conditions for the adsorption of Ca2+ metal ions by sulfonate-modified GPTMS silica occurred at pH 5, contact time of 60 minutes, and concentration of 20 ppm. The adsorption process of Ca2+ metal ions by sulfonate-modified GPTMS silica follows the langmuir isotherm equation with an absorption capacity of 2.7824 mg/g. The results of the comparison of the absorption capacity of silica after modification obtained greater results than before modification, where the absorption capacity after modification was 2.225375 mg/g with an absorption percentage of 57.17%, before modification the absorption capacity was 1.677275 mg/g, and the absorption percentage was 43.07%.
Studi Pengaruh Rasio Mol Silika terhadap Titania dalam Pembentukan Koordinasi Titanium Tetrahedral dalam Silika-Titania dengan Metoda Solid State Yuliani, Amelinda; Veronita, Silvi; Pernadi, Niza Lian; Nizar, Umar Kalmar
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.v12i3.117884

Abstract

Titanium tetrahedral coordination shows high activity as a catalyst so that it attracts attention to be researched and developed. In this study, tetrahedral titanium coordination was studied and produced through the Si-O-Ti bond between solid silica precursors and solid titania. Both precursors are mixed in toluene and sonicated for homogeneity. The resulted mixture was calcined at a temperature of 400oC for 8 hours and then characterized with DRS UV-Vis, XRD and FESEM. The results showed that the synthesis sample experienced an increase in tetrahedral titanium fraction from 27% to almost 34%. Characterization with XRD indicates that the diffraction pattern of the resulting sample is very similar to the titania precursor with a crystalline pattern with an anatase and rutile phases. The morphology of the resulting sample showed that silica samples that did not react with titania experienced agglomeration
Pengaruh Variasi Konsentrasi NaOH Terhadap Xerogel dari Kulit Durian (Durio zibethinus Murr.) Anjelia, Mariza; Nasra, Edi; Kurniawati, Desy; 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.v13i1.124374

Abstract

The objective of this study was to synthesize xerogel from durian peel waste by determining the optimal NaOH concentration for the synthesis process. The sol-gel method was employed, utilizing SiO2 as the main component and Na2SiO3 as the precursor. The sodium silicate precursor was obtained by reacting SiO2 derived from durian shell ash with NaOH solutions of various concentrations: 2 M, 5 M, 8 M, 11 M, and 14 M. The surface area of the resulting xerogel was tested, and the optimal NaOH concentration was found to be 8 M, yielding a surface area of 6637.8 m2/g. The synthesized xerogel was further characterized using FTIR analysis within the wave number range of 4000-600 cm-1. The FTIR data revealed the presence of silanol at a wave number of 3253.30 cm-1 and siloxane at a wave number of 1060.18 cm-1, confirming the successful synthesis of the xerogel.
Uji Antioksidan Fungi Endofitik BS-1 yang Berasosiasi Dengan Bunga Sambiloto (Andrographis Paniculata) Dengan Beras Hitam Sebagai Media Pertumbuhan Hayuni, Sri; Riga, Riga; Nasra, Edi
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.v13i1.123226

Abstract

Sambiloto (Andrographis paniculata) is a popular medicinal plant from the Acanthaceae family and andrographolide was the main secondary metabolite with various biological activites including antioxidant. A. paniculata is one of the medicinal plants reported as potential host for endophytic fungi. This study aims to determine the potential of endophytic fungi associated with A. paniculata flower tissue as a source of antioxidant compounds. An isolate from the flowers of A. paniculata was coded as BS-1. Macroscopic observation of BS-1 fungi showed a white mushroom colony with a round shape in the middle and a slightly rough surface. Crude extract of endophytic fungi BS-1 showed the presence of phenolic compounds, terpenoid, steroids, and alkaloids. The antioxidant activity of fungal BS-1 expressed as IC50 and categorized as moderate, with IC50 results in the range of 101-250 ppm.
Degradasi Zat Warna Metanil Yellow dengan Katalis TiO2 Menggunakan Metode Fotosonolisis Reflia, Tiwi; Sanjaya, Hary; Budiman, Septian
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.v13i2.124978

Abstract

The photosonolysis method has been investigated to degrade the metanil yellow in a sample solution using the catalyst of TiO2. This study aims to determine how the effect of adding catalyst mass to the degradation of metanil yellow. The variation of the mass of the catalyst used to degrade the metanil yellow dye is from 0.5 grams, 0.1 grams, 0.15 grams, and  0.25 grams at 120 minutes according to the optimum time. The UV-Vis spectrophotometer was used to calculate the absorbance of metanil yellow before and after degradation processes, while FTIR was used to determine the spectrum and functional groups before and after degradation. The results of the measurement of the maximum wavelength of the color of metanil yellow using a UV-Vis spectrophotometer were 434 nm with an absorbance value of 0.267. In the variation of the catalyst mass, the optimum mass obtained at 0.1 grams of TiO₂ catalyst with %D obtained was 35,58 %. In this study, the presence of hydroxyl radicals produced during photosynthesis plays an important role in degrading metanil yellow.
Metode Sol Gel Untuk Mengekstraksi Silika Dari Abu Sekam Padi Rosmiyani, Tia; Sari, Trisna Kumala; Alizar, Alizar; Mulia, Melindra
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.v12i3.118458

Abstract

Rice husk ash (RHA) is a lignocellulosic material such as biomass in other materials that also contain silica. Amorphous silica obtained from rice husk ash is thought to be an important source that can produce silicon carbide, pure silicon and silicon nitride flour. Rice husk ash contains high silica (>60%). Gel silica is ekstracted by adding sodium hydroxide to produce a sodium silicate solution. The silica extraction was carried out by reacting the rice husk ash using 1M NaOH solution at 80°C for 1 hour. Subsequently, it was added 1M HCl to pH 7. Then it was evaporated in an oven at 80°C to constant weight. Based on the results of the FTIR analysis, the absorption peak of silica with a wavelength of 1070.17 cm-1 is similar to the absorption peak of 98% silica with an absorption wavelength of 1054.95 cm-1. The extracted gel silica has an amorphous crystalline form where in the XRD test there is an absorption peak that widens in the range of 2θ = 22
Penentuan pH dan Waktu Kontak Optimum Penyerapan Ion Zn2+ Pada Silika Modifikasi Sulfonat Dwi Putri, Vika Trisna; Oktavia, Budhi; Dewata, Indang; Hardeli, Hardeli
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.v13i2.124370

Abstract

Silica gel is one type of silica that can be used as an adsorbent. Silica gel has the ability to adsorb ions because it has two active sides that can be modified, namely the silanol group and siloxane. Silica modification is carried out to increase the adsorption ability of ions, one of which is Zn2+. In modified silica used 4-amino-5-hydroxy-2,7-naphthalenedisulfonate compounds as modifiers. In binding silica with modifier compounds, glycidoxypropyltrimethoxysilane (GPTMS) is added as a connecting compound. The modified silica was characterized by Infra-red spectrometer (FTIR) which showed the presence of sulfonate functional groups at wave number 1501,11 cm-1. The results of Zn2+ ion absorption with batch method are analyzed with an Atomic Adsorption Spectrophotometer (AAS) and obtained optimum conditions at pH 6 with an adsorption capacity of 1.257 mg/g with an adsorption percentage of 85,12%, at a contact time of 45 minutes with an adsorption capacity of 1.310 mg/g with an adsorption percentage of 71,29% .
Perbandingan Pengaruh Lampu UV dan Sinar Matahari Pada Degradasi Zat Warna Congo Red Menggunakan Metode Fotolisis Dengan Bantuan Katalis TiO2 Julizen, Rofilian; Sanjaya, Hary
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.v12i3.118506

Abstract

Research conducted by photolysis method to degrade Congo Red dye produced from textile industry waste that has a negative impact on the environment using a TiO2 catalyst aims to determine the optimal degradation percentage on the effect of radiation time and the effect of UV lamp power on the degradation of Congo Red. UV-VIS spectrophotometer measurement results obtained a wavelength of 497nm. The results showed that the percentage of degradation of the optimum radiation time was 92% at 180 minutes, and under the influence of UV lamp power the highest percentage of degradation was 95.21% at 20 watt UV lamp. This study showed that the hydroxyl radical (∙OH) was the main control in degrading Congo Red.
Optimasi Adsorpsi Ion Tembaga (II) Menggunakan Silika Gel-GPTMS Termodifikasi Sulfonat Setiowati, Fiqih Sekar; Oktavia, Budhi; Sanjaya, Hary; Putra, Ananda
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.v13i1.124286

Abstract

Adsorption is a process of sorption onto a specific substance that occurs at the surface of a solid material due to intermolecular forces or the penetration of a substance into the solid material surface. Adsorption involves an adsorbent as the sorbent material and an adsorbate as the component being sorbed. Silica gel is a commonly employed adsorbent for the sorption of Cu2+ ions. It is utilized as an adsorbent due to the presence of silanol and siloxane groups, which serve as active sites that can be modified. The modification aims to enhance the adsorption capacity of silica gel for Cu2+ metal ions. In aquatic environments, Cu metal ions are highly toxic to living organisms, posing significant hazards. The modifying compound employed in this study is monosodium salt of 4 – amino – 5 – hydorxy – 2,7 – naphthalenedisulfonic acid. However, prior to the sulfonate compound modification, a linking compound, γ-glycidoxypropyltrimethoxysilane (GPTMS), is required. The purpose of this study was to determine the effect of variations in pH and contact time on the adsorption of Cu2+ metal ions on sulfonate modified silica gel – GPTMS. The modified silica gel was characterized using Fourier-transform infrared (FTIR). The adsorption of Cu2+ ions was characterized by specific surface area (SSA), and the optimal adsorption conditions were determined as pH 4 and  contact time of 60 minutes.

Page 30 of 35 | Total Record : 343

 28   29   30   31   32 

Filter by Year

2012 2025


Reset
Filter By Issues
All Issue Vol 14, No 2 (2025): PERIODIC Vol 13, No 3 (2024): PERIODIC Vol 13, No 2 (2024): PERIODIC Vol 13, No 1 (2024): PERIODIC Vol 12, No 3 (2023): PERIODIC Vol 12, No 2 (2023): PERIODIC Vol 12, No 1 (2023): PERIODIC Vol 11, No 3 (2022): PERIODIC Vol 11, No 2 (2022): PERIODIC Vol 11, No 1 (2022): PERIODIC Vol 10, No 2 (2021): PERIODIC Vol 10, No 1 (2021): PERIODIC Vol 9, No 2 (2020): PERIODIC Vol 9, No 1 (2020): PERIODIC Vol 8, No 2 (2019): PERIODIC Vol 8, No 1 (2019): PERIODIC Vol 5, No 2 (2016) Vol 2, No 2 (2013) Vol 2, No 1 (2013) Vol 1, No 2 (2012) Vol 1, No 1 (2012) More Issue