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All Journal Journal of Applied Chemical Science Indonesian Journal of Chemistry Jurnal Saintek Lahan Kering Molekul: Jurnal Ilmiah Kimia Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Chemistry Notes

Hermania Em Wogo

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Author-ID : 419750

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Energy Environmental Science Public Health

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The Acid-Activated Sand Potentially Ameliorates Water Calcium Content Hermania Em Wogo; Yoseph J. Hema; Suwari
Journal of Applied Chemical Science Volume 2, No. 1 , 2013
Publisher : Journal of Applied Chemical Science

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

The sand activation using three types of acids namely HNO3 0.1 M, H2SO4 1 M, and H3PO4 14 M have been done. The acid-activated sand was used as adsorbent of calcium ions (Ca2+) contained in hard water. The study was firstly determined the chemical contents of the sand using Energy Dispersive Xray Fluorescence instrument and followed by determination of the sand surface area using methylene blue and it’s surface acidity by titration. The experiment conducted with absence of the acid was carried out as an control. The results showed that the sand contained 47.95 % of SiO2 and 18.79% of Fe2O3. The highest surface area was found at the sample activated by H3PO4 14 M (27.73 m2/g). The surface area activated by H2SO4 1 M and HNO3 0.1 M were 26.56 and 25.59 m2/g, respectively. Highest surface acidity was found at the sample activated by H3PO4 14 M (299.60 µmol/gram), while those treated with H2SO4 1 M and HNO3 0.1M were 277.70 and 204.80 µmol/gram, respectively. That was, however, the sample without acid activation had surface acidity of 113.60 µmol/gram. Furthermore, the sand activated by H3PO4 14 M maximally absorbed 892.86 μmol Ca/g sand and those activated by H2SO4 1 M and HNO3 0.1M maximally absorbed 847.46 and 684.93 μmol Ca/g sand, respectively; whereas the sand without activation maximally absorbed 510.20 μmol Ca/g sand. Those results indicate that higher surface area higher surface acidity and higher capability of the calcium ion absorptions. Therefore, the acids-activated sand potentially reduces calcium ions content of hard water.

The Antibacterial Activities of the Extracts Isolated from the Aruda Leaf (Ruta angustifolia) Digested in Polar, Semipolar, and Nonpolar Solvents Windy Taebenu; Febri O. Nitbani; Hermania E. Wogo
Journal of Applied Chemical Science Volume 2, No. 1 , 2013
Publisher : Journal of Applied Chemical Science

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A research has been done to know content of metabolit sekunder and antibacterial activity of polar, semipolar and nonpolar extract aruda leaf (Ruta angustifolia). Aruda leaf extract obtained with method of maceration, while antibacterial activity test carried out by the method of dilution and diffusion agar method against Escherichia coli (gram negative) and Staphylococcus aureus (gram positive). Metabolit sekunder of content implied in aruda leaf (Ceiba pentandra) that is triterpenoid, flavonoid, saponin, polifenol, tanin and alkaloid. The result of research with dilution method that methanol extract have rate value pursue minimum (KHM) equal 20% for the bacterium Escherichia coli of and not have rate value pursue minimum (KHM) for the Staphylococcus aureus bacteria. Ethyl acetate extract have rate value pursue minimum (KHM) equal to 10% of Escherichia Coli and not have of Staphylococcus aureus bacteria, while petroleum ether extract have not rate value pursue minimum (KHM) for the Escherichia Coli bacteria and for the Staphylococcus aureus bacteria. The results showed that the diffusion method with methanol extract have inhibition diameter of bacteria Escherichia coli and Staphylococcus aureus is 1,97 mm and 1,8 mm. Ethyl acetate extract average inhibition diameter is 2,33 mm in the Escherichia coli bacteria and the Staphylococcus aureus bacteria is 1.93 mm while the petroleum ether extract average inhibiton diameter 1,6 mm in Staphylococcus aureus bacteria and of inhibition diameter against the Escherichia Coli bacteria is 1,73 mm.

OPTIMASI VOLUME LARUTAN PREKURSOR NATRIUM SILIKAT HASIL PENGOLAHAN ABU SEKAM PADI TERHADAP KELENTURAN PLASTIK KOMPOSIT SILIKA TERIMOBILISASI EDTA-AG DAN KITOSAN Hermania Em Wogo; Martha C.W Ndoen
Saintek Lahan Kering Vol 3 No 1 (2020): JSLK JUNI 2020
Publisher : Fakultas Pertanian, Universitas Timor

It has been done a study, which it aims to know the volume optimazation of precursor solution sodium silicate as a product of rice husk ash processing to the flexibility of EDTA-Ag and chitosan immobilized silica composite plastics. The silica used in this study was a destruction product of rice husk processing. the silica content in rice husk used in this experiment was 93.608 %. The solution volume of sodium silicate used was 10, 30 dan 50 mL. Meanwhile, the chitosan variations used were 0.3 and 0.7 gram. The test result of surface area with a titration method exhibited that the highest surface acidity of EDTA-Ag immobilized silica is 3,4 mmol/g at the volume of sodium silicate 30 mL. While, the area of optimum surface using a blue methyilene is 17,61131 m2/g for the volume of sodium silicate 30 mL at the contact time 80 minutes. Based on characterization result using FTIR, EDTA-Ag immobilized silica has been synthesized contains Si-OH groups from the gel silica (1083.92 cm-1), -CH2- group (1384.79 cm-1) and –NHCOCH3 group from EDTA (1639.38 cm-1). It was done a for mechanical test of plastics from EDTA-Ag and chitosan immobilized silica composite, the highest elongation percentage was obtained, namely 27,5 % at the chitosan variation 0.3 gram.

LAJU ADSORPSI DAN DESORPSI PARAQUAT PADA TANAH PERTANIAN DESA OESAO KECAMATAN KUPANG TIMUR Sherlly M.F. Ledoh; Hermania Em Wogo; Siti Arianti S.A
Molekul Vol 5, No 1 (2010)
Publisher : Universitas Jenderal Soedirman

The research about determination of kinetic adsorption and desorption rate of paraquat on agriculture area Oesao-east Kupang has been done. The aim of this research was to determine the kinetic of paraquat adsorption before and after saturated and to model the desorption. The research consisted of evaluation of the analitycal procedure for paraquat, pattern of soil kinetic adsorption and paraquat desorption. The result of procedure evaluation showed that reduced paraquat absorbed at λ maximum 606 nm and relative stability at 0-150 minutes. Constant of paraquat kinetic adsorption at natural state bigger than saturated state. k1 value at natural state was 0,011 per minute whereas k1 value at saturated state was 0,003 per minute. Desorption model of paraquat by using three desorbents were ammonium chloride, 29,2% of sea water salinity and aquadest showed the best desorbent was ammonium chloride, followed by sea water and aquadest.

Bioactive Secondary Metabolites from the Mangrove Endophytic Fungi Nigrospora oryzae Antonius Rolling Basa Ola; Titus Lapailaka; Hermania Em Wogo; Julinda Bendalina Dengga Henuk; Agnes Simamora; Lince Mukkun; Peter Proksch; Chong Dat Pham
Indonesian Journal of Chemistry Vol 21, No 4 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.63129

Mangrove forest has a distinctive habitat adapting with marine and terrestrial environment. Chemical investigation of the extract from mangrove endophytic fungi Nigrospora oryzae had resulted in the isolation of sterigmatocystin (1) and pestalopyrone (2). The structure of sterigmatocystin (1) and pestalopyrone (2) were elucidated using mass, UV and NMR spectrometers together with the comparison with the literature data. The study also showed that sterigmatocystin displayed moderate cytotoxicity but it could be further developed as antiviral and antibacterial agent based on the SAR information reported from its analogue and derivatives.

SINTESIS LEMPUNG TERINTERKALASI ANILIN DAN PEMANFAATANNYA SEBAGAI ADSORBEN FENOL Hermania Em Wogo; Febri Odel Nitbani; Putra J.P. Tjitda
Jurnal Sains dan Terapan Kimia Vol 7, No 1 (2013)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Telah dilakukan sintesis lempung terinterkalasi anilin dan pemanfaatannya sebagai adsorben fenol. Penelitian bertujuan untuk mengetahui karakteristik lempung terinterkalasi anilin dan kemampuannya dalam mengadsorpsi fenol. Penelitian meliputi preparasi lempung, pembuatan Na-Lempung dan sintesis lempung terinterkalasi anilin. Produk yang dihasilkan dikarakterisasi menggunakan spektroskopi Fourier Transform-Infrared (FTIR), difraksi sinar-X (XRD) dan luas permukaan menggunakan metode metilen biru. Selanjutnya produk tersebut digunakan untuk mengadsorpsi fenol. Hasil karakterisasi menggunakan FTIR menunjukkan serapan NH pada 3430,22 cm-1, serapan CN pada 2358,01 cm-1 dan terdapat beberapa gugus yang tetap dipertahankan pasca interkalasi. Analisa XRD menunjukkan bahwa interkalasi anilin menurunkan basal spacing 4,81 Ǻ untuk lempung alam menjadi 4,47 Ǻ untuk lempung terinterkalasi anilin diikuti penurunan luas permukaan 816,46 m2/g untuk lempung alam menjadi 789,63 m2/g pada lempung terinterkalasi anilin. Hasil penelitian mengindikasikan bahwa lempung terinterkalasi anilin dapat mengadsorpsi fenol dengan baik dibandingkan lempung alam. Hal ini sejalan dengan nilai kapasitas adsorpsi fenol oleh lempung terinterkalasi anilin yaitu 100,00 μmol/g yang lebih besar dari lempung alam (71,43 μmol/g). Kata Kunci: lempung, anilin, interkalasi, adsorpsi.

TERMODINAMIKA ADSORPSI Ca(II) DAN Cd(II) PADA ADSORBEN AMPAS TAHU Hermania Em Wogo; Luther Kadang; Magdalena A. Mir
Jurnal Sains dan Terapan Kimia Vol 8, No 2 (2014)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Telah dilakukan penelitian untuk mengetahui kemampuan ampas tahu sebagai adsorben dalam mengadsorpsi Ca(II) dan Cd(II) baik secara tunggal maupun simultan. Penelitian ini dilakukan dalam beberapa tahap yaitu preparasi adsorben, karakterisasi adsorben yang meliputi penentuan kadar air, gugus fungsi, keasaman permukaan, dan luas permukaan, serta penentuan kemampuan adsorben dalam mengadsorpsi kedua jenis logam tersebut. Hasil penelitian menunjukkan bahwa kadar air adsorben (6,802%), gugus fungsi yang berperan dalam proses adsorpsi (-NH, -OH, dan C=O), keasaman permukaan (7 μmol/g) dan luas permukaan (7,843 m2/g). Adapun kapasitas adsorpsi Ca(II) lebih besar dari Cd(II) baik tunggal maupun simultan dimana nilai kapasitas adsorpsi Ca(II) tunggal (2.857,143 μmol/g), Ca(II) simultan (2.272,727 μmol/g), Cd(II) tunggal (806,452 μmol/g), Cd(II) simultan (769,231 μmol/g). Namun energi adsorpsi Cd(II) lebih besar dari Ca(II) baik tunggal maupun simultan, dimana nilai energi adsorpsi Cd(II) tunggal (20,995 kJ/mol), Cd(II) simultan (21,439 kJ/mol), Ca(II) tunggal (13,577 kJ/mol) dan Ca(II) simultan (13,761) yang sejalan dengan konsep asam basa keras lunak. Kata kunci: adsorpsi, ampas tahu, tunggal, simultan

SINTESIS SILIKA GEL TERIMOBILISASI DITHIZON MELALUI PROSES SOL-GEL Hermania Em Wogo; Juliana Ofi Segu; Pius Dore Ola
Jurnal Sains dan Terapan Kimia Vol 5, No 1 (2011)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Telah dilakukan penelitian tentang sintesis silika gel terimobilisasi dithizon dari abu sekam padi (yang digunakan sebagai bahan adsorben). Kajian yang dilakukan meliputi sintesis dan karakterisasi silika terimobilisasi dithizon. Metode yang digunakan ialah metode sol-gel. Karakterisasi silika gel dilakukan dengan spektrofotometer inframerah (FTIR), difraktometer sinar-X (XRD), dan penganalisis luas permukaan (SAA). Hasil penelitian menunjukkan bahwa silika terimobilisasi dithizon berhasil dibuat yang ditunjukkan oleh munculnya serapan inframerah dari gugus fungsional –NH, C=N, C-N, -SH, C=S. Data XRD menunjukkan bahwa struktur silika terimobilisasi dithizon bersifat amorf. Hasil SAA menunjukkan bahwa penambahan dithizon menurunkan luas permukaan spesifik silika kecuali untuk penambahan dithizon 2 gram. Kata kunci : silika gel, imobilisasi, dithizon, sekam padi, sol-gel

IDENTIFIKASI SENYAWA ORGANIK EKSTRAK ETIL ASETAT DARI MINYAK SEREH DAPUR (Cymbopogon citratus (Dc.) Stapf) HASIL PEMURNIAN LEMPUNG TERINTERKALASI ANILIN Hermania Em Wogo; Janrigo K Mere; Imanuel Gauru
Jurnal Sains dan Terapan Kimia Vol 10, No 2 (2016)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

The Effect of Rice Varieties on Silica Purification from Rice Husk Ash as Adsorbent for Mn(II) Mersiana Bria Mosa; Hermania Em Wogo; Dodi Darmakusuma
Jurnal Sains dan Terapan Kimia Vol 17, No 1 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i1.12622

The influence of rice types on the purification of rice husk ash was investigated by extracting silica and purifying it with a 12% NaOH solution, followed by the coprecipitation technique. Rice husk samples were from Mbay (Nagekeo Regency) with two different varieties, Ciherang and Inpari 42, and from Soa (Ngada Regency) with Ciherang variety. The silica produced in this research was characterized using UV Vis spectrophotometry to obtain the surface area value. The surface acidity value was calculated using the acid-base titration method. Using XRF, the purity of silica was determined. Ciherang Mbay, Ciherang Soa, and Inpari Mbay had surface area values of 18.397 m2/gram, 18.347 m2/gram, and 18.491 m2/gram, respectively. The surface acidity value of the three samples was 45.1 mmol/gram, 45.5 mmol/gram, and 44.7 mmol/gram, respectively. The purity of silica from rice husk ash Ciherang Mbay, Ciherang Soa, and Inpari Mbay samples based on XRF was 98.6%, 98.3%, dan 99.2%, respectively. Silica with the highest purity (Inpari Mbay variety) was applied as an adsorbent in the adsorption process of manganese (Mn(II)) metal ion with an adsorption capacity of 212.76 µmol/gram and adsorption energy of 38.165 kJ/mol through chemical adsorption. Keywords: purification, rice varieties, silica, adsorption, manganese

Co-Authors Agnes Simamora Antonius R.B. Ola Beti, Milce Y. BILAUT, IDALIA Bokay, Ernawati A. Chong Dat Pham Cunha, Theo Da Dodi Darmakusuma Dodi Darmakusuma, Dodi Gauru, Imanuel Imanuel Gauru Janrigo K Mere Juliana Ofi Segu Julinda Bendalina Dengga Henuk Lapailaka, Titus Lede, Mega O. L. Ledoh, Sherlly M. F. Lerrick, Reinner Ishaq Lince Mukkun Lulan, Theodore Y. K. Luther Kadang Magdalena A. Mir Mali, Ferdianus Martha C.W Ndoen Mersiana Bria Mosa Ndoen, Martha C. W. Nitbani, Febri O. Ola, Pius D. Peter Proksch Pius Dore Ola Pius Dore Ola Putra J.P Tjipta Sabu, Marselina Sherlly Ledoh Siti Arianti S.A Suwari Tawa, Bibiana D. Tjitda, Putra Jiwamurwa Pama Windy Taebenu Yoseph J. Hema

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