Garuda - Garba Rujukan Digital

Sintesis dan Karakterisasi Magnetik Nanopartikel NiFe2O4 Menggunakan Ekstrak Kulit Buah Naga (Hylocereus Polyrhizus) Srifu Rahmawita; Alizar Ulianas
Jurnal Periodic Jurusan Kimia UNP Vol 10, No 1 (2021): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

In the past few years, intensive research has been carried out on magnetic nanoparticles, one of which is ferrite nanoparticles. These ferrite nanoparticles have the general formula MFe2O4 (where M = Mn, Co, Zn, Cu, and Ni). This nanoparticle is interesting because it has magnetic properties and is more efficient than other ferrite nanoparticles in its application. This research was conducted to synthesize NiFe2O4 nanoparticles with a hydrothermal method based on green chemistry by utilizing dragon fruit peel extract as a stabilizing agent. NiFe2O4 nanoparticles were characterized with a Gauss meter to measure their magnetic strength, FTIR, XRD and SEM were used to determine functional groups, particle size, and surface morphology of the nanoparticles. The greatest magnetic strength of magnetic nanoparticles is 0.19 mT with a composition of 25 mL dragon fruit peel extract, 2 mol Fe(NO3)3.9H2O and 1 mol Ni(NO3)2.6H2O. The FTIR test showed the presence of an OH group absorption peak at a wavelength of 3359.93 cm-1, the C = C group appeared at a wavelength of 1631.03 cm-1 and the C-O group at a wavelength of 1360.20 cm-1, which indicates that NiFe2O4 nanoparticles are protected by organic compounds (flavonoids ). Characterization of magnetic nanoparticles using XRD showed the shape of the nanoparticles produced in the form of cubic spinels with a particle size of 71.52 nm, while SEM characterization showed surface shapes such as irregular fine grains.

Sintesis Nanopartikel Magnetik Besi Oksida (Fe3O4) Metode Green Chemistry Dengan Ekstrak Daun Sirih Merah (Piper Crocatum) Rafiqa Khaira; Alizar Ulianas; Minda Azhar; Mawardi Anwar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Magnetic nanoparticles have become an interesting topic in recent years, as magnetic nanoparticles have a greater degree of magnetism, high saturation magnetization, and ease of modification and handling. One of them is the Fe3O4 magnetic nanoparticles which are used in various fields, such as in the biomedical sector which acts as antibacterial, hyperthermia, anticancer, etc. This study aims to synthesize magnetic nanoparticles of iron oxide Fe3O4 using phenolic compounds contained in red betel leaf extract as a styling agent with a co-precipitation method based on green chemistry and to characterize them. The nanoparticles formed were measured for their magnetic force with a gaussmeter and characterized by functional groups, particle size and particle surface morphology using FTIR, XRD and SEM. The data obtained show that the optimal composition for the formation of Fe3O4 nanoparticles is to compare FeCl2: FeCl3 (0.01 mol: 0.02 mol) with a volume of 5 mL of red betel leaf extract which produces a force magnetic 0.16 mT. The characterization by FTIR shows the aromatic groups O-H, C = O carboxylate and C-H which indicate the presence of organic compounds, namely phenolic (gallic acid) which functions as a protective agent (styling agent) of Fe3O4. The XRD test obtained information on the average size of the formed nanoparticles based on the FWHM value (full width at half maximum) using Scherer's equation, which is 26.66 nm. Meanwhile, SEM data shows that the shape or morphology of the Fe3O4 magnetic nanoparticles is needle-like.Keywords — Nanoparticles, iron oxide Fe3O4, green chemistry, red betel leaf extract (Piper Crocatum)

Analisis Miskonsepsi Peserta Didik pada Materi Hidrolisis Garam Menggunakan Instrumen Three-Tier Diagnostic Test di SMAN 2 Solok Yami Suca; Alizar Ulianas
Entalpi Pendidikan Kimia Vol 2 No 3 (2021)
Publisher : Universitas Negeri Padang

ABSTRACTMisconception is the discrepancy of a concept with a scientific understanding that is agreed upon by experts. The aim of this study was to identify the misconceptions experienced by students in the salt hydrolysis material. The research data was obtained through a three-tier diagnostic test consisting of 21 questions. This research involved a sample of 50 students of class XI IPA 4 and XI IPA 5 of SMAN 2 Solok. The method used in this research is descriptive. The results of the research show that in general, students experience misconceptions where the average of these misconceptions is 35%. Students experience misconceptions about the concept of understanding salt hydrolysis by 58%, the nature of the hydrolyzed salt by 29%, the types of salt hydrolysis by 34%, determining the pH of salt hydrolysis by 28%, and calculating the pH of salt hydrolysis by 25%.Keywords: Salt Hydrolysis, Misconception, Three-TierABSTRAKMiskonsepsi merupakan ketidaksesuaian suatu konsep dengan pengertian ilmiah yang disetujui oleh para ahli. Tujuan penelitian ini yaitu mengidentifikasi miskonsepsi yang dialami peserta didik pada materi hidrolisis garam. Data penelitian diperoleh melalui tes diagnostik three tier yang terdiri atas 21 butir soal. Peneliitan ini melibatkan sampel sebanyak 50 orang peserta didik kelas XI IPA 4 dan XI IPA 5 SMAN 2 Solok. Penelitian ini menggunakan metode deskriptif. Hasil penelitian menggambarkan bahwa secara umum peserta didik mengalami miskonsepsi dimana rata–rata miskonsepsi tersebut sebesar 35%. Persentase miskonsepsi peserta didik berdasarkan konsep adalah; konsep pengertian hidrolisis garam sebesar 58%, sifat garam yang terhidrolisis sebesar 29%, jenis–jenis hidrolisis garam sebesar 34%, menentukan pH hidrolisis garam sebesar 28%, dan menghitung pH hidrolisis garam sebesar 25%. Hasil penelitian menunjukkan bahwa secara umum dalam materi hidrolisis garam peserta didik mengalami miskonsepsi.Kata Kunci: Hidrolisis garam, Miskonsepsi, Three-Tier

Sistem Pembelajaran Discord Flipped Classroom Berbasis Guided Inquiry Dengan Literasi Digital untuk Mahasiswa Kimia Tahun Pertama Intan Nofita Sari; Mawardi Mawardi; Reza Akmar; Alizar Ulianas; Okta Suryani
Jurnal Penelitian Pendidikan IPA Vol 11 No 9 (2025): September
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i9.10213

This study aims to develop a valid and practical learning system in addressing the need for an instructional design that fosters digital literacy in first-year chemistry students. Using the Educational Design Research framework, the learning system was developed on Discord and integrated flipped-guided inquiry learning models. The study involved lecturers and students from Department of Chemistry, Universitas Negeri Padang. The system was structured with a server and channels to facilitate each stage of the learning process. The evaluation assessed the validity and practicality of the system. The overall results indicated the system was highly valid with overall validity of 0.85 (construct validity 0.85 and content validity 0.86) and practical (student practicality 81% and lecturer practicality 83%). These findings suggest that a Discord-based, flipped-guided inquiry system is a highly viable and useful tool for teaching thermochemistry and student’s digital literacy.

Pengaruh Doping Nikel dan Monoethanolamine (MEA) sebagai Zat Aditif terhadap Energi Celah Pita SnO2 Nadya Alexandra; Hary Sanjaya; Alizar Ulianas; Umar Kalmar Nizar
MASALIQ Vol 6 No 1 (2026): MASALIQ: Jurnal Pendidikan dan Sains
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i1.8913

The relatively large band gap energy of SnO₂ semiconductors limits their ability to absorb visible light, resulting in suboptimal photocatalytic activity. Although modification of SnO₂ band gap energy through transition metal doping has been widely studied, research that specifically combines nickel doping with the addition of monoethanolamine (MEA) using the sol–gel method remains limited. This study aimed to analyze the effect of nickel doping and MEA addition on the band gap energy of SnO₂ synthesized via the sol–gel method. A quantitative approach with a laboratory experimental design was employed, in which pure SnO₂ and nickel-doped SnO₂ with MEA addition were synthesized as research samples and subsequently characterized using a UV–Diffuse Reflectance Spectrophotometer (UV–DRS). Reflectance data were analyzed using the Kubelka–Munk approach and Tauc plot method to determine band gap energy. The results showed that pure SnO₂ had a band gap energy of 3.59 eV, whereas nickel-doped SnO₂ with MEA addition exhibited a reduced band gap energy of 2.33 eV. These findings indicate that the combination of nickel doping and MEA additive is effective in modifying the optical properties of SnO₂ and extending its light absorption into the visible region, thereby enhancing its potential as a visible-light-driven photocatalytic material. This study contributes to the development of modification strategies for SnO₂-based oxide semiconductors and opens avenues for further research on optimizing dopant and additive compositions as well as directly evaluating the photocatalytic performance of the material.

Optimasi Perbandingan Monomer Fungsional dan Pengikat Silang (Crosslinker) untuk Sintesis MIPs-Auramine Menggunakan Metode Fotopolimerisasi Aulia Safrika; Alizar Ulianas
MASALIQ Vol 6 No 2 (2026): MASALIQ: Jurnal Pendidikan dan Sains
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i2.9079

The successful synthesis of molecularly imprinted polymers (MIPs) is highly determined by the selection and ratio of functional monomers and cross-linkers, as these components directly affect adsorption capacity. The use of inappropriate types or ratios of functional monomers and cross-linkers can reduce adsorption capacity, either because quantities that are too low produce insufficiently stable polymers or because excessive quantities lead to non-specific interactions and overly dense polymer structures. This study aimed to determine the optimum ratio between the functional monomer and cross-linker for synthesizing MIPs-auramine. Methacrylic acid (MAA) was used as the functional monomer and ethylene glycol dimethacrylate (EGDMA) as the cross-linker, selected for their good stability, with a photopolymerization method that enables rapid MIPs synthesis and the formation of relatively uniform polymer structures. The study employed a quantitative approach with varied amounts of MAA and EGDMA, which were evaluated based on their adsorption capacity toward auramine dye. Data were collected using a UV-Vis spectrophotometer to determine the concentration of adsorbed auramine. The experimental results showed that the optimum MAA–EGDMA ratio for MIPs synthesis was 0.02 mol : 0.005 mol, with adsorption capacities of 0.580 mg/g and 0.640 mg/g, respectively. This optimum ratio was subsequently used to synthesize MIPs-auramine that effectively adsorb auramine dye, while also contributing to a better understanding of the relationship between monomer–cross-linker composition and the resulting polymer characteristics. The practical implications of this study indicate the potential application of MIPs-auramine in the selective detection and removal of auramine on an industrial scale.

Pengaruh Perbandingan MAA dan EGDMA terhadap Kapasitas Adsorpsi IIPs-Pb(II) Ananta Nazira Meliano; Alizar Ulianas
MASALIQ Vol 6 No 2 (2026): MASALIQ: Jurnal Pendidikan dan Sains
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i2.9370

The successful synthesis of Ion Imprinted Polymers (IIPs) is strongly determined by the selection and ratio of the functional monomer and crosslinker because these two components directly affect the resulting adsorption capacity. An inappropriate composition, whether too low or too high, can reduce adsorption performance, because a low amount tends to produce a less stable polymer structure, whereas an excessive amount can increase nonspecific interactions and form an overly dense polymer structure. This study aims to determine the optimum ratio between the functional monomer and crosslinker in the synthesis of IIPs-Pb(II). The synthesis was carried out through the photopolymerization method by varying the amounts of MAA and EGDMA, then evaluating their performance based on the adsorption capacity toward Pb(II) metal ions. The concentration of adsorbed Pb(II) metal ions was analyzed using Atomic Absorption Spectroscopy (AAS). The results showed that the optimum ratio of MAA and EGDMA was 0.01 mol : 0.015 mol, with adsorption capacities of 0.79 mg/g and 0.43 mg/g, respectively. This optimum ratio was subsequently used to produce IIPs-Pb(II) that were effective in adsorbing Pb(II) metal ions. These findings contribute to clarifying the relationship between the composition of the functional monomer and crosslinker and the characteristics of the resulting polymer. Thus, IIPs-Pb(II) have the potential to be applied in the process of selectively detecting and removing Pb(II) metal ions, especially on an industrial scale.

Optimasi Perbandingan Monomer Fungsional dan Pengikat Silang (Crosslinker) untuk Sintesis IIPs-Zn2+ Menggunakan Metode Fotopolimerisasi Rajab Miko; Alizar Ulianas
MASALIQ Vol 6 No 2 (2026): MASALIQ: Jurnal Pendidikan dan Sains
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i2.9371

Environmental pollution by heavy metals, particularly Zn2+ ions, has become a serious problem due to increasing industrial activity and their potential toxic effects on ecosystems and human health, thus requiring effective and selective separation methods. This study aims to analyze the effect of variations in the amounts of methacrylic acid (MAA) as the functional monomer and ethylene glycol dimethacrylate (EGDMA) as the crosslinker on the adsorption capacity of Ion Imprinted Polymers (IIPs)-Zn synthesized using the photopolymerization method. This study employed a quantitative approach with an experimental design through variations in the composition of MAA and EGDMA, after which the adsorption capacity was tested and analyzed comparatively. The results showed that the optimum adsorption capacity was obtained with the use of 10 mmol MAA at 3.50 mg/g and 15 mmol EGDMA at 3.65 mg/g. Increasing the amounts of MAA and EGDMA beyond the optimum conditions caused a decrease in adsorption capacity due to the formation of an overly dense polymer structure and low porosity, thereby hindering the diffusion of Zn2+ ions into the active sites. These findings indicate that the balance between the amount of functional monomer and crosslinker largely determines the successful formation of selective and efficient imprinting sites. Thus, this study contributes to understanding the mechanism of IIPs formation and provides practical implications for the development of selective adsorbents for the treatment of waste containing heavy metals.

Potensi Senyawa Bioaktif Pegagan (Centella asiatica) sebagai Antigastritis melalui Pendekatan In Silico Tabitha Oschika Putri; Alizar Ulianas
MASALIQ Vol 6 No 4 (2026): MASALIQ: Jurnal Pendidikan dan Sains
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i4.10656

Gastritis is an inflammatory disorder of the gastric mucosa with a high prevalence in Indonesia and worldwide, while the long-term use of proton pump inhibitor drugs, such as Omeprazole, has the potential to cause side effects, making safer natural alternatives necessary. This study aims to evaluate the antigastritis potential of ten phytochemical compounds of Centella asiatica through an in silico approach using the molecular docking method against the H⁺/K⁺-ATPase target (PDB ID: 3IX3). This study included protein preparation, ligand preparation, docking validation through redocking, molecular docking analysis, and ADMET prediction using AutoDock Vina, SwissADME, and ProTox-II. The results show that asiaticoside, quadranoside, madecassic acid, and epicatechin had good binding affinity and stable interactions at the active site of the protein. Several compounds also showed good pharmacokinetic and toxicity profiles. The conclusion of this study affirms that the phytochemical compounds of Centella asiatica have potential as candidates for natural antigastritis agents through the mechanism of inhibiting the H⁺/K⁺-ATPase target. The implications of this study provide an initial basis for the development of natural product-based drug candidates and open opportunities for further research through in vitro and in vivo tests to validate their effectiveness and safety.

Title

Found 9 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 9 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 9 Documents
Search