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All Journal JURNAL KIMIA SAINS DAN APLIKASI POSITRON Jurnal Kimia Khatulistiwa Jurnal Sains dan Teknologi Alchemy : Journal of Chemistry Jurnal Sains dan Teknologi Kimia SEMIRATA 2015 Biopropal Industri Jurnal Farmasi Sains dan Komunitas Journal Of Chemical Process Engineering (JCPE) ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Indonesian Journal of Pure and Applied Chemistry Chemistry Indonesian Journal of Chemical Research CHEESA: Chemical Engineering Research Articles Jurnal Teknologi Lingkungan Lahan Basah Journal Of Chemical Process Engineering al Kimiya : Jurnal Ilmu Kimia dan Terapan

Imelda Hotmarisi Silalahi

Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Tanjungpura University, Jl. Ahmad Yani, Pontianak 78124, West Kalimantan, Indonesia

Author-ID : 5301149

Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Physics Public Health

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Studi Komparasi Penggunaan TiO2 Anatase dan P25 sebagai Anoda pada Sel Surya Tersensitasi Bixin Septiani Septiani; Uray Amira Naselia; Imelda H Silalahi; Thamrin Usman; Winda Rahmalia
Journal of Chemical Process Engineering Vol 6, No 1 (2021)
Publisher : Universitas Muslim Indonesia

Penelitian ini dilakukan untuk melihat kinerja sel surya yang menggunakan TiO2-anatase TiO2-P25 sebagai anoda. Bixin digunakan sebagai sensitizer. Bixin diekstraksi dan diisolasi dari biji kesumba. Bixin dianalisis menggunakan spektrofotometer UV-Vis dan FTIR. Hasil analisis menggunakan spektrofotometer UV-Vis menunjukkan adanya 3 puncak karakteristik bixin pada 488, 459, 430 nm. Spektra FTIR bixin ditandai dengan adanya serapan pada bilangan gelombang 3183 cm-1 mengindikasikan vibrasi renggang –OH yang berasal dari gugus karboksilat, pada 2955 cm-1; 2924 cm-1; dan 2852 cm-1 vibrasi renggang H-C-H, pada 1716 cm-1 vibrasi renggang C=O, pada 1608 cm-1 vibrasi tekuk O-H, pada 1563 cm-1 dan 1518 cm-1 vibrasi renggang C=C (alkena), pada 1379 cm‑1 vibrasi tekuk C-H, pada 1255 cm-1 vibrasi renggang C-O, pada 1161 cm-1 vibrasi simetri dan asimetri C-O-C (kelompok ester), pada 1012 cm-1 vibrasi renggang C-H. Kinerja sel surya TiO2-antase/Bx/KI-I2+GKS/C menunjukkan efisiensi konversi energi maksimum yang lebih tinggi jika dibandingkan dengan TiO2-P25/Bx/KI-I2+GKS/C masing-masing sebesar (0,027±0,012)% dan (0,006±0,001)% di bawah intensitas cahaya 100 W/m2.

Substitution Reaction of Hydroxy of Citronellol with Chloride Using A Mixture of Ammonium Chloride and Sulphuric Acid Endah Sayekti; Imelda H Silalahi; Titin Anita Zaharah
ALCHEMY Jurnal Penelitian Kimia Vol 11, No 2 (2015): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.11.2.720.135-146

Substitution reaction of hydroxy of citronellol with chloride using a mixture of ammonium chloride (NH4Cl) and sulphuric acid (H2SO4) has been conducted. The citronellol was obtained from the reduction of citronellal using sodium borohydride (NaBH4) at room temperature for 30 minutes. Substitution of hydroxy of citronellol with chloride ion was carried out at 80 oC and molarity ratio of citronellol and NH4Cl 1:1, 1:2; 1:3; and 1:4 respectively. Identification of the product by gas chromatography-mass spectrometry (GC-MS) showed that the substitution reaction produced 2-isopropyl-5-methyl-1-chlorocyclohexane compound with rendemen 64,49 % in mol ratio of 1:4. The infra red (IR) analysis showed that there was a vibration at wave number 763 cm-1 which is a typical C-Cl vibrations.

Performance Improvements of Bixin and Metal-Bixin Complexes Sensitized Solar Cells by 1-Methyl-3-propylimidazolium Iodide in Electrolyte System Winda Rahmalia; Septiani Septiani; Uray Amira Naselia; Thamrin Usman; Imelda Hotmarisi Silalahi; Zéphirin Mouloungui
Indonesian Journal of Chemistry Vol 21, No 3 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.60633

Bixin is one of the potential natural sensitizers used in dye-sensitized solar cells (DSSCs). In this study, bixin was complexed with Cu(II) and Zn(II) to increase its stability. The formation of the complexes was indicated by shifting peaks absorption and the changes in the fine spectral structure observed from the UV-Vis absorption spectra. The metal-bixin complex occurs due to the interaction between the ester groups of bixin and the metal. Bixin, Cu-bixin, and Zn-bixin were used separately as sensitizers in DSSCs. The DSSCs performance was then improved by adding 1-methyl-3-propylimidazolium iodide (MPII) to the electrolyte system. The presence of MPII 0.4 M in KI-I2 electrolyte produced a higher ionic conductivity value (20.44 mS cm–1) than that without MPII (11.14 mS cm–1). This electrolyte system significantly improved DSSCs performance. Under a light intensity of 300 W/m2, the maximum energy conversion efficiencies of DSSC with bixin, Cu-bixin, and Zn-bixin as sensitizers are 0.084, 0.081, and 0.005%, respectively. The Zn-bixin-based DSSC was stable under high light intensity. Under 700 W/m2, its maximum energy conversion efficiency reaches 0.125%. There was a synergistic work observed between the metal-bixin complex and the MPII based electrolyte. This result can open the way for constructing functional materials for solar cell applications.

KARAKTERISASI KOMPONEN DESTILAT MINYAK SEREH WANGI (Cymbopogon nardus l. Rendle) DARI KECAMATAN KUALA BEHE KABUPATEN LANDAK Omarta Omarta; Afghani Jayuska; Imelda Hotmarisi Silalahi
Indonesian Journal of Pure and Applied Chemistry Vol 3, No 3 (2020)
Publisher : Tanjungpura University

Tanaman Sereh Wangi (Cymbopogon nardus l. Rendle) merupakan tanaman dari famili Poaceae yang telah lama dikenal sebagai penghasil minyak atsiri. Pemanfaatan minyak atsiri sereh wangi telah banyak diteliti sebagai pestisida nabati. Penelitian ini bertujuan untuk mengetahui persen rendemen minyak sereh wangi dan mengetahui pengaruh variasi suhu dan waktu fraksinasi terhadap komposisi senyawa yang terkandung dalam minyak sereh wangi. Minyak sereh wangi yang digunakan berwarna kuning pucat jernih dengan dengan berat jenis 0,8662 gram. Hasil identifikasi GC-MS menunjukkan bahwa minyak sereh wangi sebelum didestilasi mengandung 10 puncak senyawa dengan 3 puncak senyawa mayor berdasarkan area dominan yaitu alpha-pinene 79,07%; beta-ocimene 8,80%; dan sitronelal 6,42 %. Hasil fraksi minyak setelah didestilasi yaitu pada destilat pertama luas area alpha-pinene 90,38%; beta-ocimene 5,42%; dan sitronelal 0,47%. Destilat kedua alpha-pinene 88,11%; beta-ocimene 6,88%; dan sitronelal 0,63%. Destilat ketiga alpha-pinene 84,37%; beta-ocimene 9,40%; dan sitronelal 0,98%

SINTESIS DAN TRANSISI ELEKTRONIK SENYAWA KOMPLEKS KLOROFIL DENGAN LOGAM (M = Co2+, Fe3+) Roberta Anjelia; Imelda Hotmarisi Silalahi; Gusrizal Gusrizal
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 3 (2019)
Publisher : Tanjungpura University

Metal complexes of chlorophyll (M = Co2+, Fe3+) have been prepared from a reaction of chlorophyll isolated from cassava leaves and metal precursors (CoCl2.6H2O or FeCl3) in methanol under reflux for 4 hours. FTIR spectra of the products indicated bond changes in chlorophyll structure particularly on absorption peaks with regard to N–H, N=C, C=C and C=O groups as a result of substitution of magnesium ion with cobalt(II) or iron(FE). UV-Vis spectra mainly showed hypsochromic shifts along with an increase in absorption intensity on Soret band area in the two complexes implying electronic effects of chlorin rings due to metal complexation.

KOMPOSISI UNSUR DAN MINERAL DALAM PASIR BESI, RESIDU BAUKSIT DI PT. INDONESIA CHEMICAL ALUMINA (ICA) (ELEMENTAL COMPOSITION AND MINERALS IN IRON SAND, BAUXITE RESIDUE AT PT. INDONESIA CHEMICAL ALUMINA (ICA) Imelda Hotmarisi Silalahi; Nikmatun Khasanah; Titin Anita Zaharah
Indonesian Journal of Pure and Applied Chemistry Vol 4, No 3 (2021)
Publisher : Tanjungpura University

Iron sand is obtained from one of the waste treatments stages of bauxite residue called red mud, operated at PT. Indonesia Chemical Alumina (PT. ICA). Preliminary analysis of the sand indicates that the main element contained in the sand is iron with a percentage of up to 60% and titanium at 10%. This study aims to determine the elemental composition and mineral characteristics of sand that was separated magnetically from the iron sand. Magnetic separation was carried out in two stages, namely separation using a weak magnets and strong magnets. The separation resulted in approximately 71% of strong magnetic sand. The rest was separated using the strong magnet giving almost 70% of weak magnetic sand while the residue is non-magnetic sand. The weak magnetic sand was analyzed using XRF and XRD to determine elemental composition as well as the type of mineral contained in the material. Elemental analysis showed that the weak magnetic sand contains 66.331% of iron, 13,120% of silicone, 9.216% of aluminum and 7.040% of titanium. The XRD analysis presented that crystalline phase in the sand consists of ilmenite, hematite, goethite, quartz and rutile.

KOMPOSISI UNSUR DAN KARAKTERISASI MINERAL MAGNETIK DALAM RED MUD, RESIDU BAUKSIT DI PT. INDONESIA CHEMICAL ALUMINA (ICA) KALIMANTAN BARAT (ELEMENTAL COMPOSITION AND MINERAL CHARACTERISTICS OF MAGNETIC RED MUD, BAUXITE RESIDUE AT PT. INDONESIA CHEMICAL ALUMINA (ICA), WEST KALIMANTAN) Titin Anita Zaharah; Wanda Rossalina; Imelda Hotmarisi Silalahi
Indonesian Journal of Pure and Applied Chemistry Vol 4, No 3 (2021)
Publisher : Tanjungpura University

Red mud or commonly called bauxite residue is solid waste generated from the purification of bauxite into alumina through the Bayer process. The red mud was initially dried under the sun then was magnetically separated to give magnetic sand. The magnetic sand was neutralized using copious of water, refined and then characterized using XRF and XRD methods. The results show that the main elements contained in the magnetic sand from the red mud are silicon, aluminum, iron, titanium, and magnesium. XRD analysis using Search-Match followed by the calculation using Rietveld refinement showed that the sand consisted of ferrosillite (55.3%), hematite (33.9%) and ilmenite (10.7%). Elemental analysis using XRF showed the percentage of Fe 29.15%, Si 22.49%, Ca 3.19%, and Ti 2.92%, followed by other elements with low percentages.

SINTESIS DAN TRANSISI ELEKTRONIK KOMPLEKS TEMBAGA (II)-KLOROFIL Imelda Hotmarisi Silalahi; Julan Julan; Muhammad Yusprianto; Rudiyansyah Rudiyansyah
Indonesian Journal of Pure and Applied Chemistry Vol 3, No 3 (2020)
Publisher : Tanjungpura University

The copper (II)-chlorophyll complex was prepared from the reaction between the chlorophyll isolated from cassava leaves and the metal ion precursor, CuSO4.5H2O in methanol under reflux for four hours. The FTIR spectra of the reaction product compared to the chlorophyll spectra show an indication of a complexation through metal coordination with the N atom from the phyrol ring replacing the magnesium (II) ion in chlorophyll.This assumption is drawn based on changes on FTIR spectra, i.e. vibration absorption originating from the CN and NH groups in the porphyrin ring and the appearance of the distinctive vibration band of nitrogen-metal bonds which is annotated as Cu-N groups at 599.88 cm-1. Another sign is the change in the OH and CO vibration bands which imply changes in aggregate properties that occur through inter-molecular interactions due to the introduction of copper (II) metal into the chlorophyll structure. The formation of copper (II)-chlorophyll compounds is also shown from the results of atomic absorption spectroscopy by recording copper metal in the product and reducing magnesium metal concentration. UV-vis spectra of chlorophyll in methanol show a characteristic band in the dark area (Soret band) at a maximum wavelength of 404 nm and the visible area (Q band) with the strongest intensity at 665 nm. These peaks appear to shift hypsochromically in the copper (II)-chlorophyll compound to 397 nm and 650 nm with higher absorptivity, indicating a change in the electronic transition of the chlorophyll after coordinating with the copper (II) ion. A new peak at 411 nm was also observed which is suggested to indicate that the copper (II) -chlorophyll complex is in an octahedral geometry in the aggregate coordinated via nitrogen atoms in the phyrol ring in place of the magnesium (II) ion.

ISOTERM ADSORPSI FENOL OLEH LEMPUNG ALAM Nelly Wahyuni; Imelda H. Silalahi; Dina Angelina
Jurnal Teknologi Lingkungan Lahan Basah Vol 7, No 1 (2019): Januari 2019
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtllb.v7i1.34363

Abstrak Fenol merupakan polutan yang sangat berbahaya di lingkungan karena bersifat racun dan sulit terdegradasi oleh organisme pengurai. Lempung alam yang berasal dari Kecamatan Capkala, Kabupaten Bengkayang akan dikaji penggunaannya sebagai adsorben fenol. Adsorpsi dilakukan dengan metoda batch pada variasi waktu kontal dan konsentrasi awal fenol. Data kesetimbangan adsorpsi diuji dengan isoterm Langmuir dan Freundlich. Hasil penelitian menunjukkan waktu kontak optimum adsorpsi adalah 4 jam. Proses adsorpsi fenol oleh lempung alam mengikuti model isoterm adsorpsi Langmuir dengan kapasitas adsorpsi sebesar 0,65mg/g. Kata Kunci: fenol, Freundlich, isoterm adsorpsi, Langmuir, lempung alamAbstract Phenol is a pollutant that is very dangerous in the environment because it is toxic and difficult to degrade by decomposing organisms. Natural clay from Capkala District, Bengkayang Regency will be studied as phenol adsorbent. Batch experiments were carried out by varying the parameters like contact time of adsorption and initial phenol concentration. The equilibrium data were tested with Langmuir and Freundlich isotherm. The results showed that the optimum contact time for adsorption was 4 hours. The process of adsorption of phenol by natural clay follows the Langmuir adsorption isotherm model with an adsorption capacity of 0.65mg/g. Keywords: adsorption isotherm, Freundlich, natural clay, phenol, Langmuir.

Bandgap Energy of TiO₂/M-Chlorophyll Material (M=Cu²⁺, Fe³⁺) Muhammad Yusprianto; Titin Anita Zaharah; Imelda Hotmarisi Silalahi
Jurnal Kimia Sains dan Aplikasi Vol 24, No 4 (2021): Volume 24 Issue 4 Year 2021
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

The bandgap energy (Egap) of TiO2 material modified with metal-chlorophyll complex compounds (M = Cu2+, Fe3+) was observed. Chlorophyll (Chl) was isolated from cassava leaves, and its UV-Vis spectra showed absorption peaks in the Soret band region (410 nm) and in the Q band region (665 nm), which is the typical peak of chlorophyll. Copper(II)-chlorophyll complex was prepared from the reaction between chlorophyll and CuSO4.5H2O, while the iron(III)-chlorophyll was synthesized from chlorophyll and FeCl3.6H2O in methanol solvent under reflux at 65°C. The presence of copperand iron metals in the chlorophyll metal complexes was identified using Atomic Absorption Spectroscopy in methanol solution. The absorption of copper measured in Cu2+-Chl was 0.0488 (0.4805 mg/L), while the iron atom in Fe3+-Chl was 0.0050 (0.0195 mg/L). The UV-vis spectra demonstrate the hypsochromic shift of the Soret band to 405 nm (Cu2+-Chl) and 402 nm (Fe3+-Chl). The Infrared spectra of chlorophyll after being complexed with copper(II) shows the increase of vibrational absorption wavenumber of the C=N group from 1225.06 cm-1 to 1241.94 cm-1 indicates the coordination of the metal ion on the N atom in the pyrrole ring. The shift in the absorption band on the Fe3+-Chl spectrum was seen for the C=O ester group from 1720.49 cm-1 to 1721.10 cm-1 indicating the metal ion bonding in the C=O group of esters. The DR-UVis analysis of TiO2/metal-chlorophyll shows a bathochromic shift towards the visible light region. By using the Tauc plot method, it was observed that the Egap of TiO2 reduces from 3.08 eV to 2.89 eV and 2.93 eV in the compound of TiO2/Cu2+-Chl and TiO2/Fe3+-Chl, respectively.

Co-Authors Afghani Jayuska Amanda, Ferdian Rizki Angelina, Dina Anis Shofiyani Ari Widiyantoro Arif Sulaiman Aritonang, Anthoni Batahan Chris Octavianus Dina Angelina Emy Awalliah Endah Sayekti Fabiani, Verry A. Firdaus, Giska Ristianty Gusrizal Gusrizal Harlia Harlia Heni Pujiastuti Henry Martua Tampubolon Henry Martua Tampubolon, Henry Martua Illen Stevani Julan Julan Kartika, Novi Lestari, Agustina Duwan Muhammad Yusprianto Muhammad Yusprianto Naselia, Uray Amira Nelly Wahyuni Nikmatun Khasanah Nurhadini Nurhadini Nurlina, Nurlina Omarta Omarta Peni Peni Peni Peni Puji Ardiningsih Risya Sasri Roberta Anjelia Rudiyansyah Rudiyansyah Sadenta, Deby Pascalia Sari Damayanti Sembiring, Albert Septiani Septiani Septiani Septiani Thamrin Usman Thamrin Usman Thamrin Usman Titin Anita Titin Anita Zahara Titin Anita Zahara, Titin Anita Titin Anita Zaharah Titin Anita Zaharah Titin Anita Zaharah Titin Anita Zaharah Ullica, Dheasi Rani Uray Amira Naselia Uray Amira Naselia Wanda Rossalina Winda Rahmalia Winda Rahmalia Winda Rahmalia Yossy Yossy Zaharah, Titin Anita Zéphirin Mouloungui

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