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All Journal VALENSI BERKALA FISIKA Jurnal Penelitian Hasil Hutan The Journal of Pure and Applied Chemistry Research Journal of Engineering and Technological Sciences Jurnal Sains Dan Teknologi Lingkungan Jurnal Sains & Teknologi Lingkungan Jurnal Kimia Riset Jurnal Hasil Penelitian Industri INDONESIAN JOURNAL OF ESSENTIAL OIL Al-Kimia ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Biosaintifika: Journal of Biology & Biology Education Jurnal Purifikasi Chemistry Indonesian Journal of Chemical Research ASEAN Journal on Science and Technology for Development Jurnal Jamu Indonesia Jurnal Penelitian Hasil Hutan Milang Journal of Mathematics and Its Applications Analit: Analytical and Environmental Chemistry

Eti Rohaeti

Departemen Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Institut Pertanian Bogor, Indonesia

Author-ID : 2663480

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Other

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A Simple Photometer and Chemometrics Analysis for Quality Control of Sambiloto (Andrographis paniculata) Raw Material Rudi Heryanto; Derry Permana; Aryo Tedjo; Eti Rohaeti; Mohamad Rafi; Latifah Kosim Darusman
The Journal of Pure and Applied Chemistry Research Vol 6, No 3 (2017): Edition of September - December 2017
Publisher : Chemistry Department, The University of Brawijaya

In this paper, we described the use of a light emitting diode (LED)-based photometer and chemometric analysis for quality control of king of bitter or sambiloto (Andrographis paniculata) raw material. The quality of medicinal plants is determined by their chemical composition. The quantities of chemical components in medicinal plants can be assessed using spectroscopic technique. We used an “in house” photometer to generate spectra of sambiloto. The spectra were analyzed by chemometric methods, i.e. principal component analysis (PCA) and partial least square discriminant analysis (PLS-DA), with the aim of herbal quality classification based on the harvesting time. From the results obtained, based on thin layer chromatography analysis, sambiloto with different collection times (1, 2, and 3 months) contained different amounts of active compounds. Evaluation of sambiloto, using its spectra and chemometric analysis has successfully differentiated its quality based on harvesting time. PCA with the first two PC’s (PC-1 = 60% and PC-2 = 35%) was able to differentiate according to the harvesting time of sambiloto. Three models were obtained by PLS-DA and could be used to predict unknown sample of sambiloto according to the harvesting time

Scaling Up of the Pyrolysis Process to Produce Silica from Rice Husk Casnan Casnan; Erliza Noor; Hartrisari Hadjomidjojo; Irzaman Irzaman; Eti Rohaeti
Journal of Engineering and Technological Sciences Vol. 51 No. 6 (2019)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2019.51.6.1

Rice husk is a potential alternative source of silica and silicon. The mechanism of heating (pyrolysis) for the decomposition of rice husk is an important factor in obtaining silica of high purity. Medium-scale pyrolysis to produce silica from rice husk serves as a bridge to connect laboratory-scale production to industrial-scale production. The purpose of this study was to model and scale up the pyrolysis process as a guidance for industrial-scale production. The research method used was experimentally based. An experimental investigation was undertaken in five stages. 1) Analyzing rice husk mass conversion using thermogravimetry analysis (TGA); 2) pyrolysis modeling based on a laboratory investigation using COMSOL Multiphysics version 5.3; 3) medium-scale experiments according to the modeling results; 4) validation of the modeling results by carrying out a medium-scale experiment; 5) silica purity analysis using SEM-EDX. The medium-scale pyrolysis simulation of silica manufacture from rice husk obtained a heating rate of 1.5 °C/min. There was an increase in the heating rate of 1 °C/min when compared to the laboratory-scale process. The pyrolysis of rice husk for the production of silica affects the mass conversion and selectivity of the resulting silica product. The mass conversion produced was 13.33% to 17.87% and the purity of silica produced was 63.99% to 82.74%.

Sintesis Dan Karakterisasi Natrium Silikat (Na2SiO3) Dari Sekam Padi Linda Trivana; Sri Sugiarti; Eti Rohaeti
Jurnal Sains & Teknologi Lingkungan Vol. 7 No. 2 (2015): SAINS & TEKNOLOGI LINGKUNGAN
Publisher : Teknik Lingkungan Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jstl.vol7.iss2.art1

Abu sekam padi umumnya mengandung silika (SiO2) sebesar 86,90-97,30% dan sejumlah kecil alkali dan logam pengotor. Kandungan silika yang tinggi pada abu sekam padi dapat digunakan sebagai alternatif sumber silika yang potensial dalam sintesis natrium silikat. Natrium silikat murni disintesis melalui dua tahap, yaitu isolasi silika dari sekam padi dan sintesis natrium silikat. Isolasi silika terdiri atas proses pengarangan, pengabuan arang sekam pada suhu 600°C, selama 2 jam dan pemurnian silika dengan HCl 3%. Natrium silikat disintesis dengan cara destruksi dengan NaOH yang diikuti dengan peleburan. Natrium silikat yang diperoleh akan dikarakterisasi dengan teknik FTIR untuk analisis gugus fungsional dan EDS untuk analisis komposisi serta kadar unsur yang terkandung dalam sampel. Analisa FTIR sampel natrium silikat membuktikan terjadinya pembentukan SiO2. Pola serapan silika yang muncul umumnya adalah gugus silanol (≡Si-OH) dan siloksan (≡Si-O-Si≡). Pita serapan di 2800-3750 cm-1 menunjukkan gugus –OH silanol dan H2O yang diserap. Bilangan gelombang 682,8 cm-1 menunjukkan ikatan Si-O-Si dan vibrasi ulur Si-O pada silanol (≡Si-OH) pada bilangan gelombang 972,12 cm-1. Hasil EDS menunjukkan bahwa unsur-unsur yang terdapat dalam natrium silikat sintetis, yaitu oksigen 71,89%, natrium 22,63%, dan silikon 5,39%.

Evaluasi Pemberian Unsur Hara Besi pada Kandungan Asam Amino dan Mineral dalam Biji Jagung Deden Saprudin; Citra Ajeng Palupi; Eti Rohaeti
Jurnal Kimia Riset Vol. 4 No. 1 (2019): Juni
Publisher : Universitas Airlangga

Evaluasi pemberian pupuk nanomagnetit (Fe3O4) 25 ppm dan pupuk komersial Fe-kelat 250 ppm terhadap kandungan nutrisi dalam biji jagung seperti kandungan proksimat, asam amino, serta mineral telah dilakukan. Asam amino ditentukan menggunakan kromatografi cair kinerja tinggi (KCKT) dan mineral ditentukan menggunakan spektrofotometri serapan atom (SSA). Pengolahan data melalui uji anova satu arah untuk membandingkan kedua jenis perlakuan. Perlakuan Fe-kelat 250 ppm dapat meningkatkan kandungan total asam amino 32% dan total mineral 86%. Begitupun perlakuan nanomagnetit 25 ppm juga terbukti meningkatkan kandungan total asam amino sebesar 18% dan total mineral 29% pada biji jagung secara signifikan jika dibandingkan dengan kontrol berdasarkan uji anova.

KARAKTERISTIK KARBON AKTIF DARI KULIT BUAH MALAPARI (Pongamia pinnata L. Pierre) Ibrahim Ibrahim; Djeni Hendra; Nur Adi Saputra; Eti Rohaeti
Jurnal Penelitian Hasil Hutan Vol 40, No 1 (2022): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2022.40.1.1-6

Pengolahan minyak nabati buah malapari (Pongamia pinnata L. Pierre) menyisakan limbah kulit buah yang belum dimanfaatkan. Salah satu pemanfaatan kulit buah malapari adalah bahan baku karbon aktif. Penelitian ini bertujuan untuk memanfaatkan limbah kulit buah malapari sebagai bahan baku arang aktif yang menggunakan cara kimia dan fisika. Kondisi optimum pembuatan arang aktif dihasilkan dari bahan baku yang dikarbonisasi pada suhu 400°C, diaktivasi dengan asam fosfat 2% dan pemanasan pada suhu 750°C sambil dialiri uap air selama 60 menit. Proses tersebut merupakan kondisi optimum yang menghasilkan rendemen arang aktif sebesar 54%, kadar air 8,6%, zat terbang 11,85%, abu 24,73%, karbon terikat 63,42%, daya jerap benzena 10,15%, daya jerap biru metilena 93,89 mg/g, dan daya jerap iod 648,62 mg/g serta luas permukaan spesifik 348,11 m2/g. Arang aktif studi ini masih di bawah standar Indonesia, yang dipengaruhi oleh waktu retensi aktivasi yang belum optimal.

PENJERAPAN KROM LIMBAH CAIR PROSES PENYAMAKAN KULIT OLEH ZEOLIT ALAM Eti Rohaeti
Purifikasi Vol 7 No 1 (2006): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

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

Chromium removal and recovery carried out by using precipitation process was reported to become costly at lower cation concentration. Therefore, the use of natural zeolit, as one of mineral abundance in Indonesia, becomes an important ion exchanger and adsorbent for this cation at low concentration. In this research, chromium’s tanning wastewater was first reacted with a precipitating agent, sodium hydroxide 1,5 M. The remaining, chromium in the filtrate, was passed through columns packed with zeolit . Tanning wastewaters are originated from two tanneries, namely Gunung Putri and Citeureup in Kabupaten Bogor. The zeolite used is originated from Cikalong, Cikembar and Lampung. The first two are mordenite type with purity grade 79% and 84% respectively. The zeolite originated from Lampung was clinoptilolite type with 94% purity grade. The capacity of cation exchange of Cikalong zeolite, Lampung and Cikembar were 94,14, 89,62 and 79,70 respectively. The capacity of chromium adsorption of Cikalong zeolit, Lampung and Cikembar under chromium synthetic solution with batch operation were 1710, 1629 and 1150 mg/kg respectively. The capacity of chromium adsorption of Cikalong zeolit Lampung, and Cikembar under chromium synthetic solution with fixed-bed operation were 1350, 1507 and 399 mg/kg respectively. Under spent tanning solution with fixed-bad method the capacity of chromium adsorption of these three zeolit were 82, 160, and 82 mg/kg respectively.

ADSORPSI DAN DESORPSI ION KROMIUM (VI) PADA HDTMA-BENTONIT Eti Rohaeti
Purifikasi Vol 12 No 3 (2011): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Bentonite is naturally negatively charged, and therefore has a high adsorption capacity towards cations such as mirrored by the cation exchange capacity (CEC) is high. This study aims to bentonite also has a high adsorption ability of anions of chromium (VI), as Cr2O72-, through activation by using hexadecyltrimethylammonium cation (HDTMA +). Bentonite origin Leuwiliang-Bogor, reacted with HDTMA + with an equivalent number of 25%, 50% and 100% CEC bentonite. HDTMA-bentonite produced and tested its ability to adsorps and desorps Cr (VI) anion. Optimum conditions of adsorption of Cr (VI) by HDTMA-bentonite carried out at pH, contact time and concentration of Cr (VI) are different. The analysis showed that the bentonite CEC Leuwiliang me/100g decreased from 54.3 to about 20.7 to 45.1 g me/100 after activated by HDTMA +. The acidity of bentonite also decreased from 4.95 me / g in natural bentonite to about 0.60 to 3.62 me / g after activated. Optimum conditions of adsorption of Cr (VI) by bentonite and HDTMA-bentonite occurs in the pH range of 2 to 5, the contact time of 3 to 4 hours and the concentration of Cr (VI) 200 to 500 ppm. Activation of bentonite with HDTMA + increases the adsorption capacity of bentonite to Cr (VI) of 4.44 mg / g to 11.96 to 22.09 mg / g. Desorption of Cr (VI) of HDTMA-bentonite by distilled water, 0.1 N HCl and 1 M CaCl 2 was relatively small, ranging from 0.89-4.15%, which indicates that Cr (VI) strongly bound in the HDTMA-bentonite.

A Brief Review on Fabrication of Screen-Printed Carbon Electrode: Materials and Techniques Wulan Tri Wahyuni; Budi Riza Putra; Achmad Fauzi; Desi Ramadhanti; Eti Rohaeti; Rudi Heryanto
Indonesian Journal of Chemical Research Vol 8 No 3 (2021): Edition for January 2021
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2021.7-wul

Screen-printed carbon electrode (SPCE) is one of the most interesting designs to combine a working (from carbon based material), reference, and counter electrode in a single-printed substrate. SPCE has been used in many electrochemical measurements due to its advantages for analysis in microscale. This paper summarises the main information about SPCE fabrication from the material and fabrication technique aspect on the flat substrate based on the work that has been published in the last 30 years. The success of SPCE fabrication is highly dependent on the composition of conductive ink which consists of conductive materials, binder, and solvents; substrate; and fabrication techniques. Among the carbon-based materials, the most widely used for SPCE fabrications are graphite, graphene, and carbon nanotubes. The frequent binder used are polymer-based materials such as polystyrene, polyaniline, poly 3,4-ethylenedioxythiophene:polystyrene sulfonate (PEDOT:PSS), and polyvinyl chloride. The solvents used for SPCE fabrication are varied including water and various organic solvents. The main characteristics of the SPCE substrate should be inert in order to avoid any interferences during electrochemical measurements. The screen printing and inkjet printing technique are preferred for SPCE fabrication due to easy fabrication and the possibility for mass production of SPCE.

Development of Differential Pulse Anodic Stripping Voltammetry Technique for Cadmium(II) Detection and Its Application in Water Spinach Budi Riza Putra; Manggar Arum Aristri; Eti Rohaeti; Wulan Tri Wahyuni
Indonesian Journal of Chemical Research Vol 9 No 2 (2021): Edition for September 2021
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2020.9-riz

Cadmium is a toxic pollutant that is harmful to the environment and humans. The purpose of this research was to develop a method for cadmium(II) detection using differential pulse anodic stripping voltammetry (DPASV) using a glassy carbon electrode. The developed method was then applied for cadmium detection in the vegetable samples which is water spinach. The developed method was optimized in several parameters such as potential window, deposition potential, deposition time, and scan rate. The developed method for cadmium(II) detection was also investigated in its analytical performance includes linearity, precision, detection limit, and quantitation limit. The optimum conditions for cadmium(II) detection in 0.1 M KCl using DPASV technique obtained such as potential window from -1200 to -100 mV, deposition potential of -1100 mV (vs Ag/AgCl), and deposition time of 360 s. It was obtained good linearity for cadmium(II) detection using the DPASV technique with an R2 of 0.996. The precision was expressed as %SBR with 0.66%. The detection and quantitation limits for cadmium(II) detection were 0.4206 ÂµM~0.0771 ppm and 0.5525 ÂµM~0.1013 ppm, respectively. The developed method was then applied for cadmium(II) measurement in the water spinach sample and the obtained cadmium(II) concentration in water spinach was 0.2399 mg/Kg.

Structural and Electrical Properties of Silica Materials from Rice Husks Casnan; Purnawan; Erliza Noor; Hartrisari Hardjomidjojo; Irzaman; Eti Rohaeti; Aditya Kurniawan
ASEAN Journal on Science and Technology for Development Vol. 38 No. 2 (2021): Repurpose & Redefine
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.697

This study aimed to analyze the structural and electrical properties of silica from rice husks recovered by the process of ashing on a medium-scale furnace with a capacity of 15 kg. Rice husks were burned at a heating rate of 1.5°C/min to a temperature of 900°C, where the temperature was retained for 1 hour each at 400°C and 900°C. The methodology of this research was conducted through the process of ashing, extraction of silica, and characterization of its structural electrical properties. The silica extracted from rice husk ash had a relatively low water content by the low absorption intensity of the group –OH at 3610 cm-1. The silica was dominated more by the siloxane group (Si-O-Si) compared with the silanol group (Si-OH). Based on XRD analysis, the silica structure was confirmed as tetragonal. The silica also had a decreased resistance, impedance, and inductance as the frequency increased. These results indicate that the obstacles contained in silica content decrease with an increase in frequency. The decreasing of dielectric constants was caused by the frequency affecting the capacitance; i.e., increased frequency caused more waves to be transmitted each second. The electric current was turned before the capacitor plate was fully charged, which caused quick charge drainage in the capacitor plate and therefore reduced the ability of a material to store the electric charge.

Co-Authors A. KUSNANTO Achmad Fauzi Aditya Kurniawan Ali Miftahudin Anak Agung Gede Sugianthara Aryo Tedjo Asih Gayatri Budi Riza Putra Budi Riza Putra Budi Riza Putra Casnan, Casnan Citra Ajeng Palupi Deden Saprudin Derry Permana Desi Ramadhanti Djeni Hendra Erliza Noor Hadjomidjojo, Hartrisari Hartrisari Hadjomidjojo Hartrisari Hardjomidjojo Ibrahim Ibrahim Irmanida Batubara Irzaman, Irzaman J. JAHARUDDIN Latifah K Darusman Latifah K Darusman Latifah K. Darusman Latifah K. Darusman Latifah Kosim Darusman Linda Trivana Linda Trivana Linda Trivana, Linda Makmum Syafi’i Manggar Arum Aristri Moh Arif Rohman Nur Hakim Mohamad Rafi Muddathir, Ali Mahmoud N. G. Pamungkas Nur Adi Saputra Nurdiani Nurdiani, Nurdiani Nurhajawarsi Nurhajawarsi Purnawan Purnawan Rahadyanoto Trimulia Reni Febriani Rudi Heryanto Septaningsih, Dewi Anggraini Siahaan, Arnold Patogi Silvi Agusri Putri Sri Sugiarti Tamida Elinda Utami Dyah Syafitri Wulan Tri Wahyuni

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