scholarly journals Produksi Isopulegol dengan Cyclisasi Citronellal Menggunakan Katalis Heterogen ZnBr2/SiO2 untuk Aplikasi Green Medicine

2019 ◽  
Vol 6 (2) ◽  
pp. 85
Author(s):  
Nuryanti Nuryanti ◽  
Rahayu Wijayanti ◽  
Masdikoh Masdikoh
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Mass Spectroscopy ◽  
Energy Dispersive ◽  
X Ray ◽  
Citronella Oil ◽  
Infra Red ◽  
Scanning Electron

Isopulegol penting sebagai senyawa intermediate dalam pembuatan menthol (C10H20O) yang mempunyai karakteristik bau peppermint dan digunakan secara luas dalam industri farmasi, industri sabun dan pasta gigi. Isopulegol sangat mahal karena banyak digunakan di dunia green medicine. Penelitian ini bertujuan untuk menghasilkan Isopulegol dengan reaksi cyclisasi citronellal menggunakan katalis heterogen ZnBr2/SiO2. Awalnya dilakukan pembuatan katalis heterogen ZnBr2/SiO2 selanjutnya dilakukan pemisahan fraksi citronellal dari citronella oil dengan destilasi fraksinasi vacuum. Fraksi citronellal yang digunakan diperoleh dari hasil isolasi citronella oil pada tekanan 33 mBarr. Dilakukan reaksi cyclisasi citronellal untuk menghasilkan isopulegol. Beberapa teknik seperti Fourier Transform Infra Red (FTIR) dan Scanning Electron Microscopy Energy Dispersive X-Ray Analysis (SEM-EDX) digunakan untuk karakterisasi katalis. Gas Chromatoghraphy Mass Spectroscopy (GC-MS) digunakan untuk analisis produksi isopulegol. Reaksi yang dilakukan menunjukkan bahwa katalis sangat selektif terhadap produk yang dihasilkan yaitu isopulegol dengan aktifitas katalis sebesar 95.63 % dan selektifitas terhadap isopulegol sebesar 94.35 %. Regenerasi katalis juga menunjukkan hasil yang baik terhadap produk yang dihasilkan dengan aktifitas sebesar 94.38 %.

scholarly journals Sintesis dan Karakterisasi CNT (Carbon Nanotube) Berdopan Logam Kobalt

2014 ◽  
Vol 17 (3) ◽  
pp. 80-85
Author(s):  
Nur Dwi Lestari ◽  
Pardoyo Pardoyo ◽  
Agus Subagio
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Carbon Nanotube ◽  
Energy Dispersive ◽  
Gas Sorption ◽  
X Ray ◽  
Infra Red ◽  
Ft Ir ◽  
Scanning Electron

Telah dilakukan penelitian sintesis dan karakterisasi CNT (Carbon Nanotube) dengan doping logam kobalt. Penelitian ini bertujuan untuk menentukan karakter CNT sebelum dan setelah didoping dengan variasi konsentrasi logam 10%, 20%, 30%, 40% dan 50%. Metode yang digunakan pada penelitian ini adalah impregnasi basah yang meliputi perendaman pada larutan logam dan kalsinasi. Hasil impregnasi dianalisis menggunakan Fourier Transform-Infra Red (FT-IR), GSA (Gas Sorption Analysis), Scanning Electron Microscopy (SEM) dan Energy Dispersive X-Ray Spectroscopy (EDS). Analisis FT-IR menunjukkan adanya vibrasi ulur dari ikatan Co-C dan Co-O.  Hasil GSA menunjukkan bahwa CNT loading 30% mempunyai luas permukaan tertinggi yaitu 69,192 m2/g. Hasil SEM-EDS menunjukkan bahwa morfologi permukaan dinding CNT ditutupi aggregat-aggregat kobalt. Pada hasil EDS fraksi kobalt dihasilkan adalah 1,96 % yang nilainya tidak jauh berbeda dari fraksi Fe yaitu 1,49%. Hal ini menunjukkan bahwa CNT doping logam Co menggunakan metode impregnasi basah tidak efektif.

scholarly journals The Characteristics of Padamarang Magnesite under Calcination and Hydrothermal Treatment

2019 ◽  
Vol 29 (2) ◽  
Author(s):  
Mutia Dewi Yuniati ◽  
Feronika Cinthya Mawarni Putri Wawuru ◽  
Anggoro Tri Mursito ◽  
Iwan Setiawan ◽  
Lediyantje Lintjewas
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Hydrothermal Treatment ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Magnesite (MgCO3) is the main source for production of magnesium and its compound. In Indonesia, magnesite is quite rare and can be only found in limited amount in Padamarang Island, Southeast Sulawesi Provence. Thus the properties of magnesite and the reactivity degree of the obtained product are of technological importance. The aim of this work was to analyze the characteristics of Padamarang magnesite under calcination and hydrothermal treatment processes. The processes were carried out at various temperatures with range of 150-900°C for 30 minutes. The solids were characterized with respect to their chemical and physical properties by using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). SEM image indicates that magnesite was formed from thin and flat hexagon sheets. The FTIR and XRD analysis disclose that MgO formed at temperature above 300°C, where as the magnesite sample also lost its mass around 50%. These results demonstrate that Padamarang magnesite decomposes to magnesium oxide and carbon dioxide at high temperature.Magnesit (MgCO3) merupakan sumber utama untuk produksi magnesium dan senyawa-senyawanya. Di Indonesia, magnesit cukup jarang dan hanya dapat ditemukan dalam jumlah yang terbatas di Pulau Padamarang, Propinsi Sulawesi Tenggara. Oleh karena itu sifat magnesit dan derajat reaktivitas dari produk-produk magnesit penting untuk diketahui. Penelitian ini bertujuan untuk menganalisis karakteristik magnesit Padamarang dengan perlakuan kalsinasi dan hidrothermal.  Proses dilakukan pada temperatur yang bervariasi dari 150-900°C selama 30 menit. Sifat kimia dan fisika dari magnesit dikarakterisasi dengan menggunakan scanning electron microscopy dengan energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), dan X-ray diffraction (XRD). Gambar dari analisis SEM menunjukkan bahwa magnesit terbentuk dari lembaran-lembaran heksagonal yang tipis dan datar. Hasil analisis dengan FTIR dan XRD menunjukkan bahwa MgO terbentuk pada temperatur diatas 300°C, dimana sampel magnesit juga kehilangan massanya sekitar 50% pada suhu tersebut. Hal ini menunjukkan bahwa Magnesit Padamarang terdekomposisi menjadi magnesium oksida dan karbon dioksida pada temperatur tinggi.

scholarly journals Analytical and computational study of three coptic icons in Saint Mercurius Monastery, Egypt

2019 ◽  
Vol 9 (6) ◽  
pp. 4685-4698
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Computational Study ◽  
Energy Dispersive ◽  
X Ray ◽  
Varnish Layer ◽  
Binder Material ◽  
Scanning Electron

Three wooden Coptic icons located at Saint Mercurius Monastery in Tamooh, Giza, Egypt were comprehensively investigated in order to determine the possible causes of their deterioration. Samples from every paint used in each icon were collected spanning from the outermost varnish layer down to the ground layer. Investigation was carried out using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), Energy-dispersive X-ray spectroscopy (EDX) and X-ray fluorescence (XRF). For interaction between the icon layers DFT calculations at B3LYP/6-31g(d,p) level were conducted in order to study the effect of humidity on the reactivity of the binder material and its possible role in the deterioration of the icons.

PENGARUH PERBANDINGAN MOLAR Ca/P DALAM PEMBUATAN LAPISAN TIPIS KALSIUM FOSFAT DARI PREKURSOR Ca(NO3)2.4H2O MELALUI METODE SOL-GEL

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Veni Dayu Putri
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Calcium Phosphate ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infra Red ◽  
Scanning Electron

<p><strong>ABSTRAK</strong></p><p><strong> </strong></p><p>Pembuatan lapisan tipis kalsium fosfat dari kalsium nitrat tetrahidrad (Ca(NO<sub>3</sub>)<sub>2</sub>.4H<sub>2</sub>O) sebagai prekursor kalsium dan asam fosfat (H<sub>3</sub>PO<sub>4</sub>) sebagai <em>prekursor</em> fosfat dengan variasi perbandingan mol Ca/P 1.50 , 1.60 , 1.67 , 1.70 dan 1.80 melalui metode sol-gel telah dilakukan. Sol yang didapat dibakar pada suhu 1000<sup>o</sup>C sehingga terbentuk powder kalsium fosfat berwarna putih. Powder yang didapat dianalisis menggunakan Fourier Transform Infra Red Spectroscopy (FTIR), X-Ray Diffraction (XRD) dan Scanning Electron Microscopy (SEM). Analisis FTIR menunjukkan adanya serapan gugus PO<sub>4</sub><sup>3-</sup>, O-H, H<sub>2</sub>O, CO<sub>2</sub>, dan P<sub>2</sub>O<sub>7</sub><sup>4-</sup>. Difraksi sinar-X dari powder yang terbentuk memberikan puncak pada sudut 2θ yang berbeda yaitu <em>Calsium Pyrophospate</em> (Ca<sub>2</sub>P<sub>2</sub>O<sub>7</sub>) dan <em>Hydroxyapatite</em> HAP (Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2 </sub>pada perbandingan molar Ca/P 1.80 . Analisis SEM menghasilkan <em>Hydroxyapatite </em>dan <em>Calsium Pyrophospate </em>dengan distribusi partikel yang tidak merata dan berbentuk <em>spheric</em>. Proses pelapisan dilakukan pada plat kaca yaitu pada perbandingan mol Ca/P 1.80 menggunakan metode dip-coating dan kemudian dipanaskan pada suhu 400<sup>o</sup>C. Hasil analisa XRD pada lapisan kalsium fosfat memperlihatkan bahwa senyawa yang terbentuk berbentuk amorf. Sedangkan analisis menggunakan SEM memperlihatkan bahwa lapisan tipis kalsium fosfat memiliki morfologi permukaan yang halus, rapat, homogen dan berbentuk <em>speric</em>.</p><p> </p><p>         <strong><em>Kata kunci</em></strong> : kalsium fosfat, <em>hydroxyapatite</em>, <em>dip-coating</em>, metode sol-gel</p><p> </p><p><strong>ABSTRACT</strong></p><p align="center"><strong> </strong></p><p><em>Preparation a thin layer of calcium phosphate using tetrahidrad calcium nitrate (Ca(NO<sub>3</sub>)<sub>2</sub>.4H<sub>2</sub>O) as a precursor of calcium and phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) as a precursor of phosphate with a variation of the mole ratio Ca/P 1.50; 1.60, 1.67, 1.70 and 1.80 through the sol-gel method have been done. Sol obtained burned at a temperature of 1000<sup>o</sup>C to form white powder of calcium phosphate. Powder obtained were analyzed using Fourier Transform Infra Red Spectroscopy (FTIR), X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). FTIR analysis showed absorption PO<sub>4</sub><sup>3-</sup> group,  O-H, H<sub>2</sub>O, CO<sub>2</sub>, and P<sub>2</sub>O<sub>7</sub><sup>4-</sup>. X-ray diffraction from powder formed providing a peak at an angle 2θ different namely Calcium Pyrophospate (Ca<sub>2</sub>P<sub>2</sub>O<sub>7</sub>) and Hydroxyapatite HAP (Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub>) at a molar ratio of Ca/P 1.80. Analysis of SEM produces Hydroxyapatite and Calcium Pyrophospate with particle distribution is uneven and shaped spheric. The coating process performed on glass plates with mole ratio of Ca/P 1.80 using a dip-coating and then heated at a temperature of 400<sup>o</sup>C. XRD analysis on a layer of calcium phosphate showed that the compound formed shaped amorphous. While using SEM analysis showed the morphology of thin layer of calcium phosphate are smooth, dense, homogeneous and shaped speric.</em></p><p><em> </em></p><p><em>         <strong>Keywords :</strong> calcium phosphate, hydroxyapatite, dip-coating, sol-gel method</em></p>

Effect of High Temperature on Morphology and Structure of Nano-Hydroxyapatite/Collagen Composite

2009 ◽  
Vol 610-613 ◽  
pp. 1360-1363 ◽  
Author(s):  
Qiang Song ◽  
Kun Hu ◽  
Fu Zhai Cui ◽  
Zhou Ying He
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
High Temperature ◽  
Room Temperature ◽  
Energy Dispersive ◽  
X Ray ◽  
Morphology And Structure ◽  
Scanning Electron

Nano-hydroxyapatite/collagen composite was processed at room temperature, 180°C, 200°C and 220°C under atmosphere for 10 min respectively. The morphology of the samples was characterized by scanning electron microscopy (SEM). The structure and components of the samples were investigated by energy dispersive spectrograph (EDS), X-ray powder diffractometer (XRD) and Fourier transform infrared (FTIR). The results of SEM and EDS for nHAC changed greatly at 200°C and 220°C in comparison with room temperature. The morphology and structure of nHAC at 180°C were similar to those at room temperature. It was demonstrated that nHAC possessed thermal stability in morphology and structure.

scholarly journals PENGARUH PENAMBAHAN ABU SEKAM PADI TERHADAP STRUKTUR DAN SIFAT MEKANIK GEOPOLIMER BERBASIS FLY ASH

2020 ◽  
Vol 16 (2) ◽  
pp. 171
Author(s):  
Wahyuni Wahyuni ◽  
Subaer Subaer ◽  
Nurhayati Nurhayati
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Fly Ash ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infra Red ◽  
Scanning Electron

Telah dilakukan penelitian tentang geopolimer berbasis fly ash dengan penambahan abu sekam padi. Penelitian ini bertujuan untuk mengetahui struktur dan sifat mekanik geopolimer berbasis fly ash dengan penambahan abu sekam padi. Geopolimer berbasis fly ash dibuat dengan penambahan abu sekam padi 0%, 20% dan 40% menggunakan metode aktivasi alkali dan dipanaskan pada suhu 70℃ selama 2 jam. Struktur mikro dari sampel  diketahui dengan menggunakan teknik X-Ray Diffraction (XRD) dan menggunakan Scanning Electron Microscopy (SEM). Gugus fungsi dari sampel diperoleh berdasarkan pengujian Fourier Transform Infra Red (FTIR). Sifat mekanik seperti Kuat tekan dari sampel diuji menggunakan Testing Mechine. Massa jenis, porositas dan kuat lentur dilakukan pengukuran terhadap sampel. Hasil penelitian menunjukkan diperoleh fase trydimate yang tertinggi pada sampel Geo FA+ASP (60+40)%. Hasil karakterisasi Scanning Elektron Microscopy (SEM) menunjukkan material penyusun sampel telah berikatan dengan baik walaupun sebagian kecil pertikel fly ash dan abu sekam padi masih terlihat dengan jelas. Gugus fungsi pembentuk geopolimer diperoleh pada stretching Si-O-Si dengan nilai gelombang antara 478-461cm-1 dan 791-781cm-1. Massa jenis tertinggi diperoleh pada sampel dengan penambahan 40% abu sekam padi dan porositas tertinggi diperoleh pada sampel tanpa penambahan abu sekam padi. Kuat tekan yang terbesar diperoleh dari sampel geopolimer berbasis fly ash tanpa penambahan abu sekam padi sedangkan kuat lentur tertingi diperoleh dari sampel geopolimer berbasis fly ash dengan  penambahan abu sekam padi sebesar 40%.

scholarly journals Analytical Chemistry Methods of Estimating the Original Firing Temperature of Bricks from a 19th Century Convent in the Philippines: Perspective of a Southeast Asian Country | Mga Pamamaraan ng Mapanuring-Kimika sa Pagtantya ng Orihinal na Temperatura ng Pagsunog sa Ladrilyo Mula sa Isang Ika-19 na Siglong Kumbento sa Pilipinas: Pananaw ng Isang Bansa sa Timog-Silangang Asya

SPAFA Journal ◽  
2021 ◽  
Vol 5 ◽  
Author(s):  
Jan-Michael Cayme
Keyword(s):  
Analytical Chemistry ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Ftir Spectroscopy ◽  
Firing Temperature ◽  
Fourier Transform Infrared ◽  
Energy Dispersive ◽  
X Ray ◽  
Scanning Electron

Countries in Southeast Asia have a unique and diverse culture due to its varied ethnic groups having different traditions and beliefs. The process of manufacturing building materials such as brick masonry is one aspect where this distinctiveness is manifested. This study provides a general analytical chemistry method that will estimate the original firing temperature of a historical brick material from a convent in Milaor, Camarines Sur, Philippines. Different instrumental techniques were utilized namely the Energy Dispersive X-ray Fluorescence (EDXRF), Fourier Transform Infrared (FTIR) Spectroscopy and Scanning Electron Microscopy with Energy Dispersive X-ray (SEM-EDX). From these techniques, the chemical and mineralogical composition of the brick was reported. The clay mixture used in the production of the brick is known to be non-calcareous and low refractory, that was fired in an oxidizing atmosphere. The brick’s microstructure is classified within the initial vitrification stage based on the features of the mineral transformations. The results of this study point to an estimated firing temperature range of 650°C to 850°C. An emphasis on the importance of chemical analysis in studying cultural heritage materials in the Southeast Asian region is also highlighted on this paper.  Ang mga bansa sa Timog-Silangang Asya ay may natatangi at magkakaibang kultura sanhi ng iba’t ibang mga pangkat etniko na may magkakaibang tradisyon at paniniwala. Ang pamamaraan ng paggawa sa mga materyales ng lumang gusali tulad ng ladrilyo ay isang aspeto kung saan naipapamalas ang pagkakaiba-iba nito. Ang pagaaral na ito ay nagbibigay ng isang pangkalahatang pamamaraan ng mapanuring-kimika para tantyahin ang orihinal na temperatura ng paggawa sa lumang ladrilyo mula sa isang kumbento ng Milaor, Camarines Sur, Pilipinas. Iba’t ibang mga instrumento ang ginamit tulad ng Energy Dispersive X-ray Fluorescence (EDXRF), Fourier Transform Infrared (FTIR) Spectroscopy at ang Scanning Electron Microscopy na nakakabit sa Energy Dispersive X-ray (SEM-EDX). Mula sa mga intrumentong ito, ang kemikal at mineral na komposisyon ng ladrilyo ay iniulat. Ang mga pinaghalong luad na ginamit sa paggawa ng ladrilyo ay masaasabing hindi gaanong madami ang bilang ng kalsiyo at mababang refractory, na sinunog sa isang kapaligiran na sagana sa hangin. Ang mga pinaka-maliliit na istruktura ng ladrilyo ay masasabing nasa paunang yugto ng pagtunaw ng mga mineral sa luad, batay sa mga pagbabagong anyo ng mga ito. Sa mga resulta ng pagaaral, masasabi na ang tantyang temperatura ng pagsunog ay nasa 650°C hanggang 850°C. Binibigyan ng diin ang kahalagahan ng pagsusuri ng kimika sa pagaaral ng mga materyales na pamanang kultura sa rehiyon ng Timog-Silangang Asya ay naitala din sa pagaaral na ito.

scholarly journals Development of cobalt-doped alumina hybrids for adsorption of textile effluents

2017 ◽  
Vol 36 (1-2) ◽  
pp. 182-197 ◽  
Author(s):  
Kousar Parveen ◽  
Uzaira Rafique
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Methyl Orange ◽  
Azo Dyes ◽  
Congo Red ◽  
Energy Dispersive ◽  
Textile Effluents ◽  
X Ray ◽  
Scanning Electron

The discharge volume and composition of textile effluents gain scientific concern due to hazardous and biotoxic nature of azo dyes. Azo dyes are non-biodegradable due to its complex molecular structure and recalcitrant nature. Serious attempts have been made to synthesize and develop new materials to combat the environmental problems. The present study is designed for removal of azo dyes (Methyl orange, Congo red and Basic fuchsine) from synthetic aqueous solutions and real textile effluents. For this purpose, cobalt-doped alumina hybrids are synthesized and applied as adsorbents in batch experiment. Two different aluminium precursor (aluminium nitrate and spent aluminium foil) and glucose are mixed following sol–gel method to get hybrids. The synthesized hybrids are characterized for surface and bulk properties using Fourier transform infrared, scanning electron microscopy and energy dispersive X-ray techniques. The characterization of materials under Fourier transform infrared revealed that –OH (3487–3504 cm−1), C–H (2935–2985 cm−1), Al–O–C (∼1380 cm−1), Al–O (∼ 800 cm−1), Al–O–Al (659–669 cm−1) and Co–O (583–589 cm−1) groups participate in the binding of dyes onto the surface of hybrids. Amorphous shaped particles and elemental composition (carbon, aluminium and oxygen) are demonstrated in scanning electron microscopy–energy dispersive X-ray micrograph. Time-dependent batch experiments under identical experimental parameters showed 74% of basic fuchsine, 68% of methyl orange and 85% maximum removal of Congo red onto the surface of cobalt-doped alumina hybrids probably through ion exchange mechanism. The experimental data when treated with adsorption models and isotherms, pseudo-second-order kinetic and Freundlich isotherm are found to be best fitted. The present study accomplishes the successful synthesis of novel and efficient cobalt-doped alumina hybrids provides environmental friendly and economical alternative option to the commercial adsorbents for the treatment of textile effluents.

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