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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Penelitian Pendidikan IPA (JPPIPA) INTECOMS: Journal of Information Technology and Computer Science JURNAL PENDIDIKAN TAMBUSAI IKRA-ITH ABDIMAS Indonesian Journal of Chemical Analysis (IJCA) Jurnal Ilmu Fisika Indonesian Journal of Chemical Science and Technology Entalpi Pendidikan Kimia Jurnal Ilmiah Telsinas Elektro, Sipil dan Teknik Informasi Action Research Literate (ARL) Jurnal Pengabdian Masyarakat Bhinneka
Alizar, Alizar
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Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences

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Analysis of Misconceptions on Hydrocarbons Using Two-Tier Diagnostic Test Instruments at SMA Pertiwi 1 Padang Liza, Yulia Mona; Alizar, Alizar; Fitriza, Zonalia; Iryani, Iryani
Entalpi Pendidikan Kimia Pre-print Vol 2, No 2, 2021
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/epk.v2i1.125

Abstract

The concept is an understanding of an individual or a group of people who is expressed in the form of a meaning that produces knowledge in the form of theories, principles and laws. Conception is a person's ability to understand concepts, both those obtained through interaction with the environment and concepts obtained from formal education. The conceptions of students that are different from what the experts agree on are called misconceptions or misunderstandings. Misconceptions of students that appear continuously will interfere with the formation of scientific conceptions and result in learning problems that can affect student learning outcomes. Therefore it is necessary to analyze the misconceptions of students. One of the diagnostic tests that can be used to analyze misconceptions is a two-tier multiple choice test or also known as a two-tier multiple choice, where the first level is the question being tested while the second level contains the reasons for the answer to the first level. This study aims to analyze misconceptions and determine the percentage of students' misconceptions on hydrocarbon material using descriptive methods. The subjects in this study were 27 students of class XI IPA 2 in SMA Pertiwi 1 Padang. The research instrument was a Two Tier Multiple Choice diagnostic test by dividing students' conceptual understanding into the categories of conceptual understanding, misconception, and conceptual misunderstanding. The results showed that the percentage of students' conceptual understanding in the concept understanding category was 32%, misconception was 34%, and did not understand the concept by 35% on hydrocarbon material. Students' misconceptions on hydrocarbon material at SMA Pertiwi 1 Padang were categorized as moderate
Synthesis and Characterization of HPMpFBP Using Raman Spectroscopy, Nuclear Magnetic Resonance (NMR) Spectroscopy, and FTIR Yusri, Wilda Triputri; Yulkifli, Yulkifli; Alizar, Alizar; Md Isa, Illyas
Jurnal Ilmu Fisika Vol 13, No 2 (2021): September 2021
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.13.2.109-117.2021

Abstract

Synthesis is one of the models for the formation of a new drug or compound with the aim of obtaining better activity at an economical price. HPMpFBP has been synthesized by mixing of 1-phenyl-3-methyl-5-pyrazolone and 4-fluorobenzoyl chloride. In the synthesis of HPMpFBP, a new compound namely 1-phenyl-3-methyl-4-(4-fluorobenzoyl)-5-pyrozolone has been obtained. The sample then characterized by non-invasive methods using Raman spectroscopy, Nuclear Magnetic Resonance (NMR) Spectroscopy and FTIR. Through this characterization process, wavelength information, chemical shift, and functional groups (chemical structure) of HPMpFBP samples were obtained. HPMpFBP has a chemical structure of C17H13N2O2F, the highest wavelength carried out by characterization using Raman is 1643.91 cm-1, the highest chemical shift characterized by using NMR (Nuclear Magnetic Resonance) is 7.8628 ppm, and the functional groups identified by using FTIR are (O-H, C-H, C=C, C=O, C-N). Information from the HPMpFBP sample characterization process using mentioned characterization methods was compared with previously reported results.
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.
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%.
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
Characterization of Molecularly Imprinted Polymers (MIPs) as Cholesterol-Absorbing Materials Nadia, Nadia; Kurniawati, Desy; Alizar, Alizar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49367

Abstract

Molecularly Imprinted Polymer (MIP) membranes as cholesterol absorbers have been successfully synthesized. MIP membranes can absorb cholesterol molecules because they have cavite (pores) and active groups that are selective and sensitive to cholesterol molecules. MIP membranes are synthesized from butyl acrylate monomers, cross-linkers, ethylene glycol dimethacrilate (EGDMA), initiators of 2- 2-dimethoxy-2-phenylacetophenone (DMPP, sodium dodecyl sulfate (SDS) as surfactants, and cholesterol as templates. MIP membranes are synthesized using photopolymerization irradiated with UV light. The results obtained in the form of powder solids can be characterized using UV-Vis spectrophotometry. The results obtained by UV-Vis spectrophotometry showed that the MIP membrane prepared a standard curve with a linear regression equation y = 0.0054x-0.007 with a value of R2 = 0.9982. This suggests that MIP membranes are selective and sensitive to analytes. At optimum absorption of the MIP-cholesterol membrane can absorb cholesterol molecules in the amount of 0.020 grams of cholesterol composition within 20 minutes
Effect Type of Desorption Eluent and Concentration in Desorption of Zn2+ Cation from Sulfonate Modified Silica Gel-GPTMS (Glycydoxypropyltrimethoxysilane) Adsorbent Hafis, Muhamad; Oktavia, Budhi; Alizar, Alizar; Warda Ningsih, Sherly Kasuma
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 7, No 2 (2024): JULY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i2.62256

Abstract

Silica has silanol groups contained in it which have low binding ability because it has low acidity, resulting in low absorption effectiveness on silica. In order to improve the properties and to expand the field of utilization, a modification process is carried out on silica gel using GPTMS bridging compounds and sulfonate salts as modifiers. The study explains that CaCl2.2H2O with a desorption percent of 97.25% has a greater ability than NaCl which is only 83.93% in the desorption of Zn2+ cations. The study also explains that the optimum concentration of CaCl2.2H2O eluent in the desorption of Zn2+ cations is at 1mmol/L where the desorption yield is 93.74%.
Characterization of Silica Nanoparticles from Pumice as an Aerogel Adsorbent Hidayah, Rahma; Kurniawati, Desy; Alizar, Alizar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 7, No 1 (2024): JANUARY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i1.56435

Abstract

Pumice is often found around the banks of rivers, this stone is a type of igneous rock formed from volcanic eruptions. One of the compounds contained in pumice is silica. Therefore, the synthesis of silica nanoparticles from pumice using the sol gel method was used because it is simpler and more efficient in terms of cost and processing time. the initial step was by reacting pumice powder and NaOH at 70°C - 80°C then synthesized by adding 2M HCI to form a gel or white precipitate, soaking in ethanol, teos, hexane solutions was then synthesized to become an aerogel. Silica synthesis results into silica aerogels were characterized by FTIR and XRF. From FTIR silanol and siloxane functional groups were found, and the SiO2 composition increased to 93,299% after synthesis.
Characterization of Silica Nanoparticles from Pumice as an Aerogel Adsorbent Hidayah, Rahma; Kurniawati, Desy; Alizar, Alizar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49368

Abstract

Pumice is often found around the banks of rivers, this stone is a type of igneous rock formed from volcanic eruptions. One of the compounds contained in pumice is silica. Therefore, the synthesis of silica nanoparticles from pumice using the sol gel method was used because it is simpler and more efficient in terms of cost and processing time. the initial step was by reacting pumice powder and NaOH at 70°C - 80°C then synthesized by adding 2M HCI to form a gel or white precipitate, soaking in ethanol, teos, hexane solutions was then synthesized to become an aerogel. Silica synthesis results into silica aerogels were characterized by FTIR and XRF. From FTIR silanol and siloxane functional groups were found, and the SiO2 composition increased to 93,299% after synthesis.
Analisis Persepsi Penumpang Pada Pelayanan LRT JABODEBEK Utama, Rodika; Alizar, Alizar
Jurnal Ilmiah Telsinas Vol 7 No 2 (2024)
Publisher : Universitas Pendidikan Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38043/telsinas.v7i2.5401

Abstract

Transportasi merupakan kebutuhan penting bagi mobilitas perkotaan, khususnya di Jakarta. Light Rail Transit (LRT) Jabodebek, sebagai salah satu moda transportasi massal berbasis rel, dirancang untuk memenuhi kebutuhan transportasi umum yang efektif dan efisien di tengah kemacetan kota. Penelitian ini bertujuan menganalisis persepsi penumpang terhadap kualitas pelayanan LRT Jabodebek, yang dapat mempengaruhi keputusan penggunaan kembali. Metode yang digunakan meliputi Customer Satisfaction Index (CSI) dan Importance Performance Analysis (IPA). Hasil penelitian menunjukkan nilai CSI sebesar 83,68%, yang mengindikasikan tingkat kepuasan penumpang yang sangat tinggi. Meskipun demikian, analisis IPA mengidentifikasi atribut-atribut yang perlu ditingkatkan, seperti kebersihan gerbong, sistem keamanan, pelayanan tanpa hambatan, tanggapan terhadap keluhan penumpang, dan jaminan keamanan barang bawaan. Kebersihan gerbong dan keamanan yang baik penting untuk kenyamanan dan keselamatan penumpang, sementara pelayanan yang lancar dan tanggapan cepat terhadap keluhan serta pengawasan barang meningkatkan kepuasan dan kepercayaan pengguna. Dengan memperbaiki aspek-aspek ini, LRT Jabodebek dapat meningkatkan kualitas layanan dan keseluruhan tingkat kepuasan penumpang, serta menarik lebih banyak pengguna di masa depan.  
Co-Authors Abdillah, Aditya Nur Adam, Wahyu Adi Saputra, Rifaldi Andreas Andreas AYU LESTARI Benti Etika, Sri Berlian, Anggananda Budhi Oktavia Desy Kurniawati Dewi, Marysca Shintya Edi Nasra Fatma, Winda Faulina Fato, Adri Hafifah, Haifa Hafis, Muhamad Hidayah, Rahma Indang Dewata Ira Damayanti, Ira Iryani Iryani Komarudin Komarudin Lestari, Kardina Liza, Yulia Mona Lubis, Andika Marlini, Rahmida Md Isa, Illyas Mulia, Melindra Nadia Nadia Pandiangan, Ronaldo Mulyadi Parbuntari, Hesty Pratama, Aditya Eka Putra, Ananda Putra, Anggih Permata Putri Rinjani, Mitna Sekar Putri, Reza Athia Romy Dwipa Yamesa Away Rosmiyani, Tia Safitri, Tofana Eka Saputra, Yusuf Adi Sari, Trisna Kumala Sherly Kasuma Warda Ningsih Trisna Kumala Sari Utama, Rodika Yerimadesi Yerimadesi Yulkifli Yulkifli Yusri, Wilda Triputri Zonalia Fitriza