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All Journal VALENSI Jurnal Natur Indonesia Jurnal Matematika & Sains Jurnal Riset Kimia Majalah Kulit, Karet, dan Plastik Journal of Aceh Physics Society Jurnal Litbang Industri Jurnal Riset Teknologi Pencegahan Pencemaran Industri CHEMPUBLISH JOURNAL ALCHEMY Jurnal Penelitian Kimia Jurnal Ilmu Fisika Jurnal Riset Teknologi Pencegahan Pencemaran Industri Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Jurnal Litbang Industri Andalas Dental Journal SAINTI: Majalah Ilmiah Teknologi Industri Jurnal Katalisator Jurnal Penelitian Kehutanan Wallacea
Emriadi -
Universitas Andalas
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Dentistry Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Social Sciences Other

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Karboksimetil Kitosan sebagai Inhibitor Korosi pada Baja Lunak dalam Media Air Gambut Maria Erna; Emriadi Emriadi; Admin Alif; Syukri Arief
Jurnal Matematika & Sains Vol 16, No 2 (2011)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Telah dites efek karboksimetil kitosan (KMK) sebagai inhibitor korosi pada baja lunak dalam air gambut menggunakan metode berat hilang. Efisiensi inhibisi juga  dikarakterisasi berdasarkan energi aktivasi reaksi korosi dengan dan tanpa KMK dan pembentukan lapisan film pasif pada permukaan logam dipelajari menggunakan Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX) dengan dan tanpa menggunakan KMK. Hasil menunjukkan bahwa efisiensi inhibisi korosi dipengaruhi oleh pH air gambut, waktu perendaman dan konsentrasi KMK. Inhibisi optimum yaitu  93,66%. terjadi pada pH 7 dan waktu perendaman 3 hari. Efisiensi inhibisi inhibitor ini meningkat dengan naiknya konsentrasi KMK. Inhibisi KMK pada permukaan baja mematuhi modifikasi persamaan isoterm adsorpsi  Langmuir dan  diasumsikan terjadi melalui adsorpsi kimia pada permukaan logam dengan nilai DGoads -35,413 kJ mol-1. Nilai negatif DGoads menunjukkan bahwa adsorpsi KMK terjadi secara spontan pada permukaan baja lunak. Kata kunci: Air gambut, Baja lunak, Inhibitor korosi, Karboksimetil kitosan.   Carboxymethyl Chitosan as a Corrosion Inhibitor for Mild Steel in Peak Water Abstract Carboxymethyl chitosan (CMC) had been tested as a corrosion inhibitor for mild steel in peat water using weight loss method. The inhibition efficiency is also characterized based  on activation energies of corrosion reaction and the formation of passive film on the surface of the metal was studied using Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX) in the presence and absence  of CMC. Result showed that the inhibition was influenced by the peat water pH, immersion time and CMC concentration. The optimum inhibition i.e. 93,66%  obtained at pH 7 and immersion time 3 days. The inhibition efficiency of this inhibitor increased with the increasing of CMC  concentration. The inhibition of CMC on the steel surface followed modified Langmuir isotherm equation and assumed to occur through chemical adsorption  on the metal surface with DGoads -35.413 kJ mol-1 . The negative value of DGoads  indicated that the adsorption of CMC  onto the mild steel surface occured spontaneously. Keywords: Carboxymethyl chitosan, Corrosion inhibitor, Mild steel, Peat water.
TRANSPOR ION TEMBAGA (II) MELALUI TEKNIK MEMBRAN CAIR FASA RUAH Tetra, Olly Norita; Alif, Admin; A, Hermansyah; -, Emriadi
Jurnal Riset Kimia Vol 1, No 1 (2007): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v1i1.57

Abstract

 ABSTRACT Bulk liquid membrane methode have been used to study transport  of  Cu(II) ion containing oxine as carrier. It was found that total Cu(II) ion 20 ppm was transported from source phase to receiving phase after 360 min reached 97.3 % in optimum conditions source phase pH is 3, oxine concentration as carier in membrane phase is 17.5 x 10-4 M, membrane volume is 20 mL, sulfur acid concentration in receiving phase 0.15 M and time of balance is 15 minute. Thus a pH gradient is utilized to drive the Cu(II) transport.
PEMBUATAN LAPISAN TIPIS DAN SERBUK TIMBAL TITANAT DENGAN METODA SOL GEL -, Rahmayeni; -, Emriadi; Susanti, Eli; Silvia, Delfi
Jurnal Riset Kimia Vol 1, No 1 (2007): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v1i1.62

Abstract

 ABSTRACT Thin layer and powder of lead titanate had been prepared using lead acetate and tetraethylorthotitanate as precursor by sol gel process. The thin layer of composite was obtain through layering the composite on glass substrate. Both thin layer and powder were calcined between 100-700°C and were characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), UV and Fourier Transform Infra Red (FTIR). The diffraction pattern show that the structure of composite on glass substrate is amorf at 500°C and could not identified at 700°C while the powder is crystalline at 500 and 700°C. FTIR spectra shown the Ti-O peak at 1407 cm-1, the Pb-O and Pb-O-Ti peaks at 718 and 600 cm-1, respectively. 
PENGARUH INHIBITOR EKSTRAK DAUN INAI (lawsonia inermis) TERHADAP LAJU KOROSI BAJA ST. 37 DIUKUR DENGAN METODE PENGURANGAN MASSA Handani, Sri; Wildani, Sri; -, Emriadi
Jurnal Riset Kimia Vol 4, No 1 (2010): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v4i1.148

Abstract

 Vol. 4, No. 1ABSTRACT The corrosion tests and micro structure analysis of St. 37 steel had been investigated. These investigation were conducted in nitric acid (HNO3). The range of concentration added was from 0-0.5 N with extract of henna leaves as inhibitors. The method used was losing mass by measuring loss mass of steel before and after corrosion. The boiling method was used to get the extract of henna leaves. Optical photo Carton Stereo Trinokuler were used for micro structure. Corrosion rate can be reduced by adding inhibitor and inhibition efficiency is measured if its ability to suppress corrosion. The result of the immersion tests show that the inhibition efficiencies are different on 0-0.5 N concentration are 81.96 %, 78.92 %, 53.74 %, 44.85 %, 44.45 % and 39.65 %. Addition of 50 g/1000 mL extrac of henna leaves results in the highest efficiency for HNO3 environment. The photo showed the surface structure of steel before corrosion, in layer with extract of henna leaves and after corrosion in medium nitric acid. Keywords: Corrosion rate, Inhibition efficiency, Extract of henna leaves, Nitric acid.   
KONDUKTIVITAS ELEKTRODA DARI CAMPURAN RESIN DAMAR DAN ZEOLIT DARI BOTTOM ASH Muttaqin, Afdhal; Emriadi, Emriadi; Tetra, Olly Norita
Jurnal Ilmu Fisika Vol 6, No 1 (2014): JURNAL ILMU FISIKA
Publisher : Jurnal Ilmu Fisika

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (255.818 KB) | DOI: 10.25077/jif.6.1.31-35.2014

Abstract

Proses sokletasi terhadap resin damar dengan menggunakan pelarut heksana mempengaruhi sifat konduktivitas dari campuran damar dengan zeolit pada perbandingan tertentu. Konduktivitas elektroda dari resin damar dan zeolit bottom ash diukur dengan menggunakan rangkaian sederhana. Elektroda dibuat dengan mencampur hasil sokletasi resin damar dan zeolit dengan perbandingan tertentu. Zeolit yang digunakan merupakan hasil sentesis dari limbah bottom ash melalui metoda hidrotermal menggunakan peleburan NaOH. Hasil yang diperoleh menunjukkan bahwa damar yang telah disokletasi mempunyai konduktivitas yang lebih tinggi dibandingkan dengan damar tanpa sokletasi.
EKSTRAK METANOL DARI DAUN MAHKOTA DEWA (Phaleria macrocarpa) SEBAGAI INHIBITOR KOROSI BAJA DALAM ASAM KLORIDA Rahmi, Azimatur; -, Emriadi; Alif, Admin
Jurnal Riset Kimia Vol 7, No 2 (2014): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v7i2.168

Abstract

Vol 7 No 2ABSTRACTExtract of Phaleria macrocarpa leaves have been studied as corrosion inhibitor for mild steel ofhydrochloric acid solution 2.0 N. The efficiency of inhibition was evaluated by gasometric methodand electrochemical analysis. The temperature and concentration effects on the inhibitorsperformance were also investigated. The result obtained showed that the extract is one of promisingcandidate as an inhibitors for the corrotions of mild steel in HCl media, inhibition efficiencyincrease as the extract concentration is evaluated. The activation energy (Ea) increase with theaddition of the extract. Where inhibition of extract on the steel surface obey modified Langmuirisotherm equation. Potentiodynamic polarization curve indicated the Phaleria macrocarpa leavesextract play role as the anodic type inhibitor.Keywords : Corrosion inhibition, mild steel, Phaleria macrocarpa, hydrochloric acid.
SINTESIS DAN KARAKTERISASI PARTIKEL NANOSPERIK TIO2 MELALUI METODE HIDROTERMAL GELOMBANG MIKRO Amir, Amelia; -, Emriadi; Arief, Syukri; Manseki, Kazuhiro; Sugiura, Takashi
Jurnal Riset Kimia Vol 7, No 2 (2014): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v7i2.166

Abstract

 ABSTRACTSimple synthesis of nanospherical TiO2 by microwave hydrothermal method has beeninvestigated. Titanium tetra isopropoxide (TTIP) and tetra methyl ammonium hydroxide(TMAOH) were used as precursor. The crystal phase and microstructure were characterized byX-Ray Diffraction (XRD) and transmission electron microscopy (TEM) including selected areadiffraction (SAED). The presence of intense peak in the XRD patterns confirmed to anatase andin good agreement with SAED patterns. Nanospherical of particles were clearly seen in theTEM image and the size of particles was approximately 4-5 nm.Keywords : microwave hydrothermal, colloidal titanates, structure directing agent,nanospherical TiO2
KAJIAN TEORITIS KEMAMPUAN CAPPING KATEKIN, KATEKU TANAT DAN QUARSETIN TERHADAP NANOPARTIKEL PERAK DENGAN MENGGUNAKAN METODA DFT-B Arief, Syukri; -, Emriadi; Saputra, Ade
Jurnal Riset Kimia Vol 9, No 1 (2015): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v9i1.256

Abstract

Interdiffusion mechanism of catechin, catechutannic acid and quercetin are studied by using DFT-B method. But before conducting these experiment, we perform molecular dynamic simulations to find adsorption models probability of each compound. Two models adsorption of quarcetin, four models for catechin and three models for catechutannic acid have been obtained from molecular dynamic simulations. Quantum parameter of each compound, energy and properties adsorption models have been calculated and discussed. The theoretical results were found to be consistent with the experimental data reported. Futhermore, optimization adsorption model samples show that all of adsorbents have weak bonds on the surface of silver nanoparticles. The mechanism can be classified as strong physisorption, so that catechin, catechutannic acid and quercetin can be categorized as good capping agent in synthesis of silver nanoparticles.
INHIBISI KOROSI BAJA RINGAN MENGGUNAKAN BAHAN ALAMI DALAM MEDIUM ASAM KLORIDA: Review Stiadi, Yeni; Arief, Syukri; Aziz, Hermansyah; Efdi, Mai; Emriadi, E.
Jurnal Riset Kimia Vol 10, No 1 (2019): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.321

Abstract

The corrosion of steel and its alloys is an important problem in industry, especially in acidic environments. Mild steel is one of the important alloys of iron which has many industrial applications because of its excellent mechanical properties, but mild steel is susceptible to corrosion. Corrosion problems need to be a concern and must be handled properly. Hydrochloric acid is widely used for pickling, cleansing, decomposition and metal etching, on the other hand also contributes to corrosion of metal surfaces. Plant extracts investigated the properties, mechanisms of adsorption and efficiency of inhibition as environmentally friendly corrosion inhibitors for various steel materials in different acidic media. The efficiency of corrosion inhibition of steel from plant extracts analyzed ranged from 72-98% and generally as a mixed-type inhibitor. Most of the inhibitors are adsorbed on the steel surface through a physisorption mechanism.
Sintesis Senyawa Aurivillius Lapis Empat PbBi4Ti4O15 dan PbBi3NdTi4O15 dengan Metode Lelehan Campuran Garam NaCl-KCl dan Karakterisasi Struktur Wibowo, Gita Rachmad; Emriadi, Emriadi; Zulhadjri, Zulhadjri
Jurnal Riset Kimia Vol 10, No 2 (2019): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v10i2.307

Abstract

Four-layered Aurivillius phases PbBi4Ti4O15doped with Nd3+ with formula PbBi3NdTi4O15 were synthesized by molten-salt technique using NaCl and KCl (1:1 molar ratio) as the flux. Precursors were weighed stoichiometrycally and grinded with salts mixture in 1:7 ratio (product : salts mixture) until homogenous. The samples were heated at temperature 600oC, 700oC, 800oC, and 900oC for 5 hours for each temperature. The products were characterized by X-ray diffractometer (XRD), Scanning Electron Microscope (SEM) and LCR-meter. XRD data were refined by Rietica program using Le Bail technique. Refinement results showed the best structure as the A21am of space group for both samples. Surface analysis for each samples morphology is the plate-like by SEM characterization. Dielectric constants measured at room temperature show that the sample doped Nd3+ has lower value than sample without containing Nd3+ cation.
Co-Authors A, Hermansyah Ade Saputra Ade saputra Admin Alif Admin Alif Admin Alif Admin Alif Afdhal Muttaqin Afrizal Afrizal Alfi Asben Alfi Asben Alif, Admin Amelia Amir Annisa Wulandari Anwar Kasim Anwar Kasim Athiyya Husna Aulia Arivin Billah Azimatur Rahmi Aziz, Hermansyah Bambang Ristiono Delfi Silvia Eli Susanti Eni Rahmi Fitria Ramadhani G Gunawarman, G Gita Rachmad Wibowo Hemansyah Aziz Hermansyah A Hermansyah Aziz I Imelda Ibnu Irawan Imelda Imelda Imelda Indah Wulandari Kazuhiro Manseki Kosno Supriyanto Lidia Gusfi Marni Mai Efdi Maria Erna Maria Erna Maria Erna Kustyawati Marniati Salim Maryam, Maryam Mohd Jain Noordin Murniwati Murniwati Novelina . Novesar Jamarun Nurul Trinanda Rizal Olly Norita Tetra Putri Arwanda Rahma Joni Redha Fauzana Refinel - Rini Ramadhani S Syukri Safni Safni Sari Wahyuni Silvia, Delfi Sri Handani Sri Handani Sri Mutiar Sri Mutiar Sri Wildani Suryati Suryati Suryati Suryati Susanti, Eli Syukri Arief Syukri Arief Syukri Arief Syukri Syukri Syukri Syukri Takashi Sugiura Wibowo, Gita Rachmad Wildani, Sri Yeni Stiadi Yola Azli Perdana Yuli Yetri Yuli Yetri Zulhadjri Zulhadjri Zulhadjri Zulhadjri Zulhadjri Zulhadjri