Ediman Ginting
Department of Physics, Lampung University, Jl. Sumantri Brojonegoro No. 1, Bandar Lampung 35145

Published : 7 Documents
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Synthesis and Characterization of Titania-Rice Husk Silica Composites as Photocatalyst Manurung, Posman; Situmeang, Rudy; Ginting, Ediman; Pardede, Indra
Indonesian Journal of Chemistry Vol 15, No 1 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (482.219 KB) | DOI: 10.22146/ijc.21221

Abstract

This article describes the synthesis of titania-silica composites by a sol-gel method using a mixture of silica of rice husk and titanium butoxide sols. Microstructures were examined at calcination temperature in the range of 500 to 700 °C, with temperatures interval of 50 °C. The sintered catalysts were subsequently tested for photodegradation of methylene blue (MB) under ultraviolet and sunlight rays. Physical characteristics were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDS), and Brunauer-Emmett-Teller (BET). The XRD results did not show the presence of silica crystal phase in each sample. The results showed that the highest BET surface area of samples was obtained at the temperature of 650 °C. In sample calcined 500 °C, the activity of the catalyst on MB was relatively similar in both sunlight and ultraviolet rays.
Analisis Transisi Fasa dan Sifat Dielektrik Pada Li2CoSiO4 yang Dipreparasi dari Silika Sekam Padi dan Produk Daur Ulang Katoda Baterai Ion Litium Bekas Riyanto, Agus; Sembiring, Simon; Megawati, Megawati; Mabarroh, Ni’matil; Junaidi, Junaidi; Ginting, Ediman
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 1 (2019): INPRESS Vol 15, No 1 (2019) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (81.924 KB) | DOI: 10.20961/alchemy.15.1.24622.89-103

Abstract

Studi ini mendeskripsikan analisis transisi fasa dan sifat dielektrik pada bahan litium kobalt silikat (Li2CoSiO4) yang dipreparasi dari silika sekam padi dan produk daur ulang katoda baterai ion litium bekas dengan perbandingan massa 1:1. Transisi fasa pada sampel Li2CoSiO4 dipelajari menggunakan teknik termogravimetry/differential thermal analysis (TG/DTA). Sedangkan, nilai konstanta dielektrik pada sampel yang telah disinter pada suhu 600 – 900 oC dikarakterisasi menggunakan inductance, capacitance, dan resistance (LCR) meter. Hasilnya, pada rentang suhu 410 – 850 oC terjadi transisi polimorfik fasa  menjadi fasa . Suhu 850 oC juga merupakan titik transisi dimana fasa  berubah menjadi fasa . Transisi fasa yang terjadi pada sampel  Li2CoSiO4 diikuti dengan peningkatan nilai konstanta dielektrik dalam rentang frekuensi 450 – 100.000 Hz.Analysis of Phase Transition and Dielectric Properties of Li2CoSiO4 Prepared from Rice Husk Silica and The Recycling Product of Used Lithium Ion Batteries Cathode. This study describes the analysis of the phase transition and dielectric properties of lithium cobalt silicate (Li2CoSiO4) prepared from rice husk silica and the recycling product of used lithium ion batteries cathode with mass ratio of 1:1. Phase transition in Li2CoSiO4 sample was studied using thermogravimetry/differential thermal analysis (TG/DTA) techniques. Meanwhile, the dielectric constant value in the samples sintered at temperature of 600 – 900 oC were characterized using inductance, capacitance, and resistance (LCR) meter. As a result, a polymorphic transition from  phase to  phase was occured in the temperature range of 410 ­– 850 oC. Temperature of 850 oC is a transition point from  phase to  phase. The phase transitions occured in the Li2CoSiO4 was followed by the increasing of the dielectric constant in the frequency range of 450 – 100,000 Hz.
Efektivitas Ekstrak Daun Pepaya (carica papaya l) sebagai Inhibitor pada Baja ST37 dalam Medium Korosif NaCl 3% dengan Variasi Waktu Perendaman sanjaya, ramon; Ginting, Ediman; Riyanto, Agus
Jurnal Teori dan Aplikasi Fisika Vol 6, No 2 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (712.783 KB) | DOI: 10.23960/jtaf.v6i2.1839

Abstract

This research aims to determine the effectiveness of papaya leaf extract (carica papaya l) as  inhibitor on st37 steel in corrosive medium nacl 3 %. To find out the corrosion rate resulted by weight reduction method. To know the phase formed on steel is done XRD analysis. While, to know the micro structure and corrosion products produced on steel after soaked in corrosive medium with inhibitor and without inhibitor papaya leaf extract, SEM and EDS analysis were performed. Based on the results of XRD analysis, SEM and EDS with the addition of inhibitors of the diffraction peaks decreased, and the corroded surface area decreased, and the reduction of FeO content in the sample wass less. From the three analyzes and calculation of corrosion rate obtained that inhibitor papaya leaf extract, effectively inhibiting the corrosion rate on St37 Steel
Komposisi Kimia, Struktur Mikro, Holding Time dan Sifat Ketangguhan Baja Karbon Medium pada Suhu 780 0C Fitri, Fitri; Ginting, Ediman; Karo, Pulung Karo
Jurnal Teori dan Aplikasi Fisika Vol 1, No 1 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (191.338 KB) | DOI: 10.23960/jtaf.v1i1.481

Abstract

Telah dilakukan proses laku panas (heat treatment) dengan menggunakan bahan baja pegas daun. Tahapan awal preparasi sampel sebagai berikut: baja pegas daun dilakukan pemanasan awal pada suhu 600 0C selama 30 menit, selanjutnya dilakukan pemanasan sehingga suhu austenisasi pada suhu 780 0C dengan waktu tahan masing-masing 20 dan 40 menit setelah itu di quenching dengan menggunakan air. Adapun uji yang dilakukan adalah uji ketangguhan dengan metode charpy, uji komposisi kimia dan struktur mikro. Dari hasil uji komposisi kimia menunjukkan bahwa baja pegas daun tergolong ke dalam baja karbon medium (C = 0,58%). Pada uji ketangguhan (impact) hasil austenisasi diperoleh nilai ketangguhan tertinggi (paling liat) pada suhu 780 0C dengan waktu tahan 40 menit sebesar 0,07 J/mm2 hal ini disebabkan atom-atom karbon pada austenit yang berasal dari perlit masih belum banyak yang berdifusi ke fasa austenit yang berasal dari ferit. Untuk struktur mikro hasil yang paling baik juga diperoleh pada suhu 780 0C dengan waktu tahan 20 menit menunjukkan ukuran dan struktur butir yang halus dan hampir seluruhnya menjadi martensit. Kata Kunci: Baja karbon medium, heat treatment, metode charpy, impact.
EFEKTIVITAS EKSTRAK DAUN SIRSAK SEBAGAI INHIBITOR PADA BAJA KARBON API 5L DALAM LARUTAN NaCl 3% Giri, Apriyanto Supriyo; Ginting, Ediman; Suprihatin, S
Jurnal Teori dan Aplikasi Fisika Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (285.474 KB) | DOI: 10.23960/jtaf.v5i1.1358

Abstract

The effectiveness of soursop leaves extract as inhibitor on carbon steel API 5L in NaCl 3% had been researched. Carbon steel API 5L submersion used NaCl 3% had been done for 144 hours with various concentrations of soursop leaves extract inhibitor adding 0%, 5%, 10%, 15%, 20%, 25%, 30%, and 35%. The research of corrosion rate was done by weight loss and electrochemistry methods. The result showed that the higher percentage of soursop leaves extract inhibitor used, the corrosion rate will decrease and capability of inhibit corrosion will increase. The greatest effectiveness of corrosion occurred at concentration of 35% in NaCl 3% and the effectiveness is 86,16%. The X-Ray Diffraction (XRD) characterization result showed that the phase formed is pure Fe. Scanning Electron Microscopy (SEM) characterization showed uneven clusters and smaller size, fewer holes and cracks too with soursop leaves extract inhibitor 35% than soursop leaves extract inhibitor 0%. Energy Dispersive Spectroscopy (EDS) characterization on sample with inhibitor 0% obtained Cl element.
Pengaruh Konsentrasi Ekstrak Kulit Buah Maja (Aegle Marmelos (l.) Corea) terhadap Laju Korosi Baja Karbon API 5L pada Medium NaCl 3% dan H2SO4 3% rasitiani, amilia; Ginting, Ediman; Karo karo, Pulung
Jurnal Teori dan Aplikasi Fisika Vol 6, No 2 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (898.68 KB) | DOI: 10.23960/jtaf.v6i2.1837

Abstract

A study has been conducted on the extract concentration effect of Maja Peel as an inhibitor of low carbon API 5L in corrosive medium of NaCl 3% and H2SO4 3%. The soaking process of low carbon API 5L was done for 35 days with variation of addition inhibitor concentrations at 0%, 0,4%, 0,5%, 0,6%, 0,7%, and 0,8%. The testing of Corrosion rate is done by weight loss method. The results showed that the highest corrosive rate in corrosive medium of NaCl 3% and H2SO4 3% was at 0% which is inhibitor concentration, 0,06 x 104 mm/y and 16,55 x 104 mm/yconcentration. Meanwhile, the lowest corrosion rate at 0.8% inhibitor concentration for corrosive medium ofNaCl 3% and 0.5%for H2SO43% corrosive medium. Hence, the greatest effectiveness of corrosion occurs at the concentration of 0.8% in a corrosive medium of NaCl 3% with effectiveness of  85,71% and 0.5% in corrosive medium of H2SO4 3% with the effectiveness of 79.35%. The characterization result of X-Ray Diffraction (XRD) shows that the phase formed is pure Fe. Characterization of Scanning Electron Microscopy (SEM) showed uneven clusters and smaller sizes, holes and cracks also with less than 0.8% inhibitors for corrosive medium of NaCl 3% and 0.5% for corrosive medium of H2SO43% compared with 0% inhibitor of maja peel extract on corrosive medium ofNaCl 3% and H2SO4 3%. Characterization of Energy Dispersive Spectroscopy (EDS) in samples with corrosive medium of H2SO43% obtained the element S (Sulfate)
PENGARUH SUHU PADA EKSTRAK DAUN CINCAU HIJAU (CYCLEA BARBATA MIERS) SEBAGAI INHIBITOR KOROSI BAJA PEGAS DAUN saputri, intan hani; Ginting, Ediman; Asmi, Dwi
Jurnal Teori dan Aplikasi Fisika Vol 6, No 2 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (771.957 KB) | DOI: 10.23960/jtaf.v6i2.1848

Abstract

This study aims to determine the extract of green cincau leaves (Cyclea Barbata Miers) as a corrosion inhibitor soaked in 3% NaCl corrosive medium. To determine the effect of concentration and temperature to connect steel, the average inhibitor is 0, 2, 4, and 6% and each temperature is 40  and 80 . To find out the measurements done by the method, save weight. Corrosion rate at immersion temperature is 40  lower than speed at 80  immersion temperature. To find out the phase formed and the structure of the sample in XRD and SEM-EDS characterization. The X-Ray Diffraction (XRD) characterization results show that the phase formed is pure Fe. XRD results showed that the lowest Fe peaks were formed on samples without inhibitors at 80 .The results of SEM characterization of PGDaun-80-6 steel also showed that it looked more corroded, and the PGDaun-40-2 sample looked slightly corroded. This result is reinforced by the percentage of corrosion products shown in the EDS results