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All Journal VALENSI Jurnal Periodic Jurusan Kimia UNP Sainstek Indonesian Journal of Chemical Science Chimica et Natura Acta Pelita Eksakta Makara Journal of Science MASALIQ: Jurnal Pendidikan dan Sains
Sherly Kasuma Warda Ningsih
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Padang State University, Kampus Air Tawar, Jl. Prof. Dr. Hamka, West Sumatera 25161
Religion Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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PENGARUH ADITIF PADA SINTESIS NANOPARTIKEL Mn2O3 MELALUI PROSES SOL-GEL Ningsih, Sherly Kasuma Warda
Sainstek VOL 07, NO 01, 2013
Publisher : Jurnal Sainstek

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Abstract

Preparation of manganese oxide by sol-gel process has been studied. Mangese nitrate and isopropanol were used as precursor and solvent, respectively. The addition of various additives that used in this research were diethanolamine (DEA), ethylene diamine and ethylene gycol. The powders were formed by drying in the temperature of 110-110 oC and after heating at 500 oC for (1) one hour. The products were obtained black powders. The products were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The XRD patterns showed Mn2O3 forms were produced generally. Crystallite sizes of Mn2O3 were obtained in the range 54-82 nm. SEM micrograph clearly showed that powder had a bulk surface and hollow with hollow size is 0.1-1.9 m approximately.
SINTESIS SENYAWA KOORDINASI AKRILAMIDA DAN ASAM ADIPAT Khair, Miftahul; Ningsih, Sherly Kasuma Warda
Sainstek VOL 07, NO 01, 2013
Publisher : Jurnal Sainstek

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Abstract

Telah dilakukan penelitian pembentukan senyawa koordinasi dengan menggunakan ligan akrilamida dan asam adipat, dengan menggunakan beberapa ion logam transisi. Teknik yang digunakan dengan difusi perlahan pada suhu kamar. Dari hasil penelitian terlihat bahwa akrilamida sangat sulit untuk bisa berkoordinasi dengan ion logam walaupun senyawa ini memiliki mode koordinasi yang banyak dan potensial. Sementara asam adipat dengan dua buah gugus karboksilat pada kedua ujungnya memperlihatkan potensi membentuk kompleks baru setelah diuji permulaan dengan spektra Infra merah.
STUDI CYCLIC VOLTAMOGRAM LAPISAN TIPIS MN2O3 DAN LI-MN2O3 PADA SUBSTRAT KACA DENGAN METODA DIP-COATING MELALUI PROSES SOL-GEL Ningsih, Sherly Kasuma Warda
Sainstek VOL 07, NO 02, 2013
Publisher : Jurnal Sainstek

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Abstract

Penelitian pembuatan lapisan tipis mangan oksida dan litium-mangan oksida pada substrat kaca telah dilakukan dengan metoda dip-coating melalui proses sol - gel. Mangan nitrat tetrahidrat dan litium klorida digunakan sebagai prekursor, diethanolamin (DEA) sebagai aditif serta isopropanol sebagai pelarut. Proses dip-coating dilakukan sebanyak 6 kali pada substrat kaca dengan waktu pencelupan 2 menit untuk satu kali pelapisan dan dikeringkan pada suhu 110-120 oC selama 15 menit untuk masing-masing pelapisan serta dilanjutkan dengan pemanasan pada suhu 400-600 oC selama 2 jam. Mikrograf SEM memperlihatkan morfologi permukaan mangan oksida yang smooth dan merata dengan ukuran butiran sekitar 0,01 m. Lapisan tipis litium-mangan oksida yang terbentuk adalah LiMn2O4 struktur spinel (JCPDS No. 35-0782) dengan ukuran kristal sekitar 16,86 nm. Morfologi permukaan lapisan pada suhu 400 dan 500 oC secara umum berbentuk serat (fiber) serta pada suhu 600 oC berbentuk bulat (spheric). Analisis Cyclic Voltammetry lapisan tipis litium-mangan oksida memiliki sifat kapasitan yang bagus pada suhu 500oC yang ditunjukkan dengan tingginya arus sekitar 110 A. Cyclic Voltammogram dari lapisan tipis litium-mangan oksida berbeda dengan data Cyclic Voltammogram lapisan tipis litium-mangan oksida pada suhu pemanasan 400 oC, arusnya sekitar 100 A, pada suhu 600 oC potensial puncak katodik pada -0,2 V dan puncak anodik pada + 0.5 V, arus sekitar 700 nA
Synthesis and Characterization of ZnO Nanoparticles Using Sol-Gel Method Ningsih, Sherly Kasuma Warda; Khair, Miftahul; Veronita, Silvi
Indonesian Journal of Chemical Science Vol 10 No 1 (2021)
Publisher : Universitas Negeri Semarang

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Abstract

ZnO nanoparticles have many applications in photocatalysis. The sol-gel technique is one of the lowest-cost and easy-to-perform methods for synthesizing ZnO nanoscale. The purpose of this study was to determine the effect of precursors on the characteristics of the ZnO nanoparticles obtained by using the sol-gel method, including examining the purity of ZnO nanopowder, crystal structure/size, and morphology. ZnO nanopowder was prepared using zinc acetate dihydrate, zinc chloride, and zinc sulfate heptahydrate as various precursors, and calcination was carried out at temperatures of 400 and 600°C. ZnO nano powder was characterized by Energy Dispersive X-Ray Fluorescence (ED-XRF), X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM). ED-XRF data shows that the highest purity of ZnO is 97.2% using zinc acetate dehydrate precursor. The precursors greatly influence the crystal structure and size of the ZnO nanopowders. In this study, the XRD ZnO pattern shows the hexagonal structure (wurtzite) with the crystal size of the ZnO nanopowders is 37-84 nm. Temperature variations affect the structure and morphology of ZnO powder. SEM micrographs of ZnO nanopowders are small spherical and twig-like agglomerations.
Synthesis and Characterization of ZnO Nanoparticles Using Sol-Gel Method Ningsih, Sherly Kasuma Warda; Khair, Miftahul; Veronita, Silvi
Indonesian Journal of Chemical Science Vol 10 No 1 (2021)
Publisher : Universitas Negeri Semarang

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Abstract

ZnO nanoparticles have many applications in photocatalysis. The sol-gel technique is one of the lowest-cost and easy-to-perform methods for synthesizing ZnO nanoscale. The purpose of this study was to determine the effect of precursors on the characteristics of the ZnO nanoparticles obtained by using the sol-gel method, including examining the purity of ZnO nanopowder, crystal structure/size, and morphology. ZnO nanopowder was prepared using zinc acetate dihydrate, zinc chloride, and zinc sulfate heptahydrate as various precursors, and calcination was carried out at temperatures of 400 and 600°C. ZnO nano powder was characterized by Energy Dispersive X-Ray Fluorescence (ED-XRF), X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM). ED-XRF data shows that the highest purity of ZnO is 97.2% using zinc acetate dehydrate precursor. The precursors greatly influence the crystal structure and size of the ZnO nanopowders. In this study, the XRD ZnO pattern shows the hexagonal structure (wurtzite) with the crystal size of the ZnO nanopowders is 37-84 nm. Temperature variations affect the structure and morphology of ZnO powder. SEM micrographs of ZnO nanopowders are small spherical and twig-like agglomerations.
Synthesis and Characterization of Nio Nanocrystals by using Sol-Gel Method with Various Precursors Ningsih, Sherly Kasuma Warda; Khair, Miftahul
Makara Journal of Science Vol. 21, No. 1
Publisher : UI Scholars Hub

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Abstract

Nickel oxide (NiO) nanocrystals were synthesized by simple sol-gel method at low temperature by using methanol as the solvent and NaOH 5M as the precipitation agent. Nickel nitrate hexahydrate, nickel acetate tetrahydrate and nickel sulfate hexahydrate were used as the precursors. The crystals were formed by drying at 100-110 °C for ± 1 hour, after which they were heated at ± 450 °C for 1 hour. The resulting products were black powders. The as-prepared NiOnanocrystals were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD patterns of the NiO nanocrystals showed that they are mostly cubic. The sizes of the NiO particles produced with nickelnitrate hexahydrate, nickel acetate tetrahydrate and nickel sulfate hexahydrate were 72.16, 38.63 and 32.84 nm, respectively. SEM images showed that the nanopowders produced by the precursors are spherical, rod-shaped andhexagonal shape with hollow, respectively.
Penjernihan Minyak Jelantah dengan Menggunakan Terong (Solanum melongena) Rizki, Suci Yulia; Hardeli, Hardeli; Ningsih, Sherly Kasuma Warda; Pernadi, Niza Lian; Sidiq, Aqil Marsya; 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.v13i2.124544

Abstract

Used cooking oil is used oil that has been heated repeatedly with high heat. At high heating, the triglycerides contained in used cooking oil can be hydrolyzed into free fatty acids. In addition, it can form free radical compounds that can cause serious diseases such as cancer. Therefore, this study aims to clarify used cooking oil using eggplant (Solanum melongena). Eggplant is rich in beneficial ingredients such as high levels of flavonoids, phenolics and antioxidants. Eggplant can be used as an adsorbent that can clarify used cooking oil. This study used the method of heating used cooking oil at a temperature of 160⁰C and the mass variations of the eggplant were 5, 10 and 15 grams. The result of this study is that the use of 10 grams of eggplant is proven to clear used cooking oil. which was previously blackish brown underwent degradation of light brown color accompanied by a decrease in the density value to 0.94 g/mL, the acid number to 2.08 mg/KOH, and an increase in the flow rate value to 0.2987 ml/s, a saponification number of 80.17 mg KOH in used cooking oil.
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.
Sintesis dan Karakterisasi Silika Berpori dari Natrium Silikat dan Surfaktan Gelatin Kulit Ikan Gabus Channa Striata Erpina, Erpina; Aini, Syamsi; Khair, Miftahul; Ningsih, Sherly Kasuma Warda
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.v13i3.125701

Abstract

Porous silica is a solid silica material for chemical sensors. Porous materials can be divided into 3 categories based on pore size, namely microporous material with pore size less than 2 nm, mesoporous pore between 2 to 50 nm, and macropores with a pore size of more than 50 nm.This research was conducted to synthesize porous silica using sodium silicate with variations of snakehead fish skin gelatin (3% and 4%) using the sol-gel method. Snakehead fish skin gelatin was characterized using FTIR and porous silica was characterized using XRD and SEM. The results of the FTIR test on snakehead fish skin gelatin show that there are indicates that snakehead fish skin gelatin contains amide, carboxyl and carbonyl groups which can interact with sodium silicate. Characterization of porous silica using XRD shows that the resulting porous silica is crystalline. Meanwhile, SEM characterization shows a regular morphology at 4% which has the highest crystallinity and branched tube morphology.
Development of Photo Electrocatalytic Chemical Oxygen Demand Design (PECOD) Sensor using Highly Ordered Titanium Dioxide Nanotube Arrays Electrodes Utami, Chichi Amne; Syauqi, Muhammad Iqbal; Ningsih, Sherly Kasuma Warda; Wibowo, Rahmat; Gunlazuardi, Jarnuzi
Chimica et Natura Acta Vol 12, No 3 (2024)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v12.n3.49333

Abstract

Population growth, industrialization, and the need to ensure water quality have fostered the demand for analytical methods and tools to determine one of the important values of water quality standards. The oxygen demand of a given water matrix provides valuable information about the presence of organic compounds in a sample. The TiO2-based photoelectrocatalytic COD (PECOD) method offers a faster, more efficient, and more accurate alternative than conventional methods. Highly ordered TiO2 nanotube arrays (HOTNAs) were synthesized by anodizing titanium metal at 45V for 2 hours. HOTNAs/FTO photoanodes are used to oxidize organic compounds in water. HOTNAs/FTO photoanode has a bandgap of 3.4eV and a current density of 0.29 mA/cm2. Environmental samples were tested with the PeCOD sensor using glucose and mixed compound addition standards method. Water samples taken from local small ponds, namely Danau Kenanga, Danau Agathis, and typical wastewater of Laundry activity reveal COD values of 15,4659 to 15,9571 mg/L O2; 19,0500 to 19,6179 mg/LO2; 445,2336 to 449,7830 mg/L O2; respectively. The developed PECOD sensor performed well and provided analytical results that were not much different from conventional methods, with an error percentage below 10%.
Co-Authors Adha, Valen Febri Aini, Syamsi Budhi Oktavia Burma, Resna Desy Kurniawati Edi Nasra Erpina, Erpina Fadhilah Fadhilah Fatmawati, Rani Hardeli Hardeli Indang Dewata Jarnuzi Gunlazuardi Marlini, Rahmida Miftahul Khair Minda Azhar Mukhaiyar, Riki Mulia, Melindra Nizar, Umar Kalmar Pernadi, Niza Lian RAHMAT WIBOWO Rizki, Suci Yulia Saputra, Dihan Kurnia Sidiq, Aqil Marsya Suryelita, Suryelita Syauqi, Muhammad Iqbal Utami, Chichi Amne Veronita, Silvi Zulhendra, Zulhendra