Garuda - Garba Rujukan Digital

Sintesis Dan Karakterisasi Kompleks Brazilin dari Ekstrak Kayu Secang (Caesalpinia sappan Linn) Serta Aplikasinya dalam Dye Sensitized Solar Cells (DSSC) Zulenda Zulenda; Uray Amira Naselia; Nico Gustian; Titin Anita Zaharah; Winda Rahmalia
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 1, May 2019
Publisher : Syarif Hidayatullah State Islamic University

Secang (Caesalpinia sappan Linn) merupakan tanaman endemik Kalimantan Barat yang mengandung pigmen berwarna merah brazilin. Dalam penelitian ini, brazilin diperoleh melalui proses maserasi dilanjutkan dengan partisi cair-cair, selanjutnya dikomplekskan dengan ion logam Cu, Mg, dan Zn untuk meningkatkan kinerjanya ketika digunakan sebagai sensitizer pada dye sensitized solar cell (DSSC). Pengompleksan dilakukan menggunakan media gliserol-air, sedangkan fabrikasi DSSC dilakukan menggunakan metode doctor blading. Hasil analisis FTIR terhadap ekstrak kayu secang menunjukkan adanya gugus fungsi O-H, C=O, C=C, dan C-H, yang merupakan gugus fungsional khas dari brazilin. Terbentuknya kompleks brazilin-Cu, brazilin-Mg, dan brazilin-Zn ditandai dengan menurunnya intensitas puncak dari C=O pada 1606 cm-1 dan –OH pada 3263 cm-1. Hasil analisis UV-Vis menunjukkan bahwa kompleks memiliki rentang panjang gelombang lebih lebar dan cenderung batokromik. DSSC yang menggunakan kompleks brazilin-Cu, brazilin-Mg, dan brazilin-Zn menghasilkan rendemen konversi energi maksimum pada 200 W/m2, berturut-turut sebesar 0.034 %, 0.030 %, dan 0.013 %, serta DSSC ekstrak kayu secang murni sebesar 0.029 %. Dengan demikian, penggunaan sensitizer berbasis kompleks logam-brazilin dapat meningkatkan efisiensi DSSC. Kata kunci: Brazilin, DSSC, fotosensitizer, kayu secang, kompleks. Secang (Caesalpinia sappan Linn) is an endemic plant in West Kalimantan that contains Brazilin red pigments. In this study, brazilin was obtained through a maceration process carried out by a liquid-liquid partition, then complexed with metal ions to improve the performance of compilation used as a sensitizer on dye-sensitized solar cell (DSSC). Complexation is carried out using glycerol-water media, while DSSC fabrication is carried out using the doctor blading method. The results of FTIR analysis of secang wood extract showed the presence of a functional group O-H, C=O, C=C, and C-H, which are typical functional groups of brazilin. The formation of the brazilin-Cu, brazilin-Mg, and brazilin-Zn complexes is characterized by an increase in peak intensity of C=O at 1606 cm-1 and O-H at 3263 cm-1. The results of the UV-Vis analysis show that the complex has a wider wavelength and uses batochromic. DSSCs that use the brazilin-Cu, brazilin-Mg, and brazilin-Zn complexes that complement each other produce efficiencies of 0.034%, 0.030%, and 0.013%, and DSSC pure secang wood extract of 0.029%. The efficiency of the brazilian metal-complex when compared with brazilin, the efficiency increases, so that the maximum efficiency obtained by the Cu-brazilin sensitizer is equal to 0.034%. Keywords: Brazilin, DSSC, photosensitizer, secang wood, complex.

SINTESIS MAGNETIT DARI LIMBAH TAMBANG BAUKSIT MENGGUNAKAN TEMPLAT CETYLTRIMETHYLAMMONIUMBROMIDE Syaila Nurhayati; Anis Shofiyani; Titin Anita Zaharah
Jurnal Kimia dan Kemasan Vol. 43 No. 2 Oktober 2021
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24817/jkk.v43i2.6516

Red mud dari tailing bauksit memiliki komposisi unsur besi cukup tinggi, yang memungkinkannya dijadikan bahan dasar sintesis magnetit. Pada penelitian ini dilakukan sintesis magnetit dari red mud dengan metode kopresipitasi menggunakan reagen pengendap NH4OH. Untuk mengontrol distribusi ukuran partikel yang dihasilkan, digunakan templat cetyltrimethylammoniumbromide (CTAB) dengan konsentrasi 0, 1 dan 2 mM. Karakterisasi magnetit hasil sintesis dilakukan menggunakan metode spektrofotometri inframerah (FTIR), difraksi sinar-X (XRD), pemindaian dengan mikroskop elektron (SEM), dan analisis ukuran partikel (PSA). Hasil penelitian memperlihatkan keberhasilan sintesis magnetit, yang dikonfirmasi melalui spektrum FTIR dan XRD. Vibrasi gugus Fe-O oktahedral dan tetrahedral dari magnetit (Fe3O4) dikarakterisasi melalui bilangan gelombang sekitar 420 cm-1 dan 550 cm-1 pada spektrum FTIR, yang didukung oleh data XRD pada nilai 2q = 30,29 ; 36,15 dan 63,55, masing-masing untuk bidang kristal (220), (311) dan (440) dari kristal magnetit. Hasil PSA menunjukkan bahwa peningkatan konsentrasi CTAB menurunkan rata-rata ukuran partikel dan nilai indeks polidispersi (PI) partikel magnetit. Hal tersebut mengindikasikan terjadinya peningkatan homogenitas dispersi partikel dalam larutan. Namun, nilai PI yang dihasilkan masih relatif tinggi (>1,68) yang diperkirakan akibat terjadinya aglomerasi. Hal tersebut dikonfirmasi melalui hasil SEM yang memperlihatkan aglomerasi pada morfologi permukaan magnetit.

Kapasitas Adsorpsi Biomassa Paku Air (Lemna minor linn) Teresterifikasi Oleh Asam Sitrat Terhadap Mangan(Ii) Anita Anita; Titin Anita Zaharah; Ajuk Sapar
Al-Kimia Vol 8 No 2 (2020): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v8i2.16144

Research on the adsorption of Mn (II) ions has been carried out using biomass duckweed (Lemna minor linn) with the esterified by citric acid. This study aims to determine the maximum adsorption capacity of Mn (II) ions in using adsorbent biomass of duckweed esterified by citric acid. Water nail biomass adsorbents were characterized using FTIR to determine the functional groups of citric acid esterified adsorbents. The stages of this research include modification of water biomass using citric acid, followed by manganese (II) ion adsorption tests with pH variations in pH, contact time of adsorption and initial concentration variations under optimum conditions. The results showed that optimum adsorption occurred at pH 5, contact time for 10 minutes and the concentration of Mn (II) solution 15 mg / L was measured using atomic absorption spectrophotometry. The equation used in the study follows the Langmuir and Freundlich equations. Based on the Langmuir isotherm equation, the maximum adsorption capacity of Mn (II) ion using citric acid modified water nail biomass is 7,645 mg/ g, the equilibrium constant is 4,317 L/ mol and the adsorption energy is 36,84039 KJ / mol.

SINTESIS MAGNETIT DARI LIMBAH TAMBANG BAUKSIT MENGGUNAKAN TEMPLAT CETYLTRIMETHYLAMMONIUMBROMIDE Syaila Nurhayati; Anis Shofiyani; Titin Anita Zaharah
Jurnal Kimia dan Kemasan Vol. 43 No. 2 Oktober 2021
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24817/jkk.v43i2.6516

Red mud dari tailing bauksit memiliki komposisi unsur besi cukup tinggi, yang memungkinkannya dijadikan bahan dasar sintesis magnetit. Pada penelitian ini dilakukan sintesis magnetit dari red mud dengan metode kopresipitasi menggunakan reagen pengendap NH4OH. Untuk mengontrol distribusi ukuran partikel yang dihasilkan, digunakan templat cetyltrimethylammoniumbromide (CTAB) dengan konsentrasi 0, 1 dan 2 mM. Karakterisasi magnetit hasil sintesis dilakukan menggunakan metode spektrofotometri inframerah (FTIR), difraksi sinar-X (XRD), pemindaian dengan mikroskop elektron (SEM), dan analisis ukuran partikel (PSA). Hasil penelitian memperlihatkan keberhasilan sintesis magnetit, yang dikonfirmasi melalui spektrum FTIR dan XRD. Vibrasi gugus Fe-O oktahedral dan tetrahedral dari magnetit (Fe3O4) dikarakterisasi melalui bilangan gelombang sekitar 420 cm-1 dan 550 cm-1 pada spektrum FTIR, yang didukung oleh data XRD pada nilai 2q = 30,29 ; 36,15 dan 63,55, masing-masing untuk bidang kristal (220), (311) dan (440) dari kristal magnetit. Hasil PSA menunjukkan bahwa peningkatan konsentrasi CTAB menurunkan rata-rata ukuran partikel dan nilai indeks polidispersi (PI) partikel magnetit. Hal tersebut mengindikasikan terjadinya peningkatan homogenitas dispersi partikel dalam larutan. Namun, nilai PI yang dihasilkan masih relatif tinggi (>1,68) yang diperkirakan akibat terjadinya aglomerasi. Hal tersebut dikonfirmasi melalui hasil SEM yang memperlihatkan aglomerasi pada morfologi permukaan magnetit.

Pelatihan Pengolahan Hasil Laut Menjadi Produk Kaya Gizi dan Kekinian di Kub Mina Sejahtera Desa Penjajap Kecamatan Pemangkat Kabupaten Sambas Nelly Wahyuni; Endah Sayekti; Gusrizal Gusrizal; Titin Anita Zaharah; Risa Nofiani
Jurnal Abdimas ADPI Sains dan Teknologi Vol. 3 No. 1 (2022): Jurnal Abdimas ADPI Sains dan Teknologi
Publisher : Asosiasi Dosen Pengabdian kepada Masyarakat Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47841/saintek.v3i1.91

Penjajap Village, Pemangkat District, Sambas Regency, West Kalimantan is located near the sea. Most of the population are fishermen, either small or medium fishermen. Currently, the village has a joint cooperative, namely KUB Mina Sejahtera Penjajap Village. This cooperative fosters fisherwomen who process processed seafood such as meatballs, frozen meatballs, and nuggets. In order to fulfil nutrition and increase the selling value of marine products, it is necessary to diversify into processed products with complete and contemporary nutritional value. This activity aims to provide training on making dim sum that has complete nutritional content, namely protein, fibre, vitamins, and carbohydrates, and is a contemporary food with a high selling value. The implementation of community service is carried out using the community development method, namely community involvement starting from problem identification and program implementation. In addition, educational methods are used, namely socialization, training and mentoring approaches, as a means of knowledge transfer and education for community empowerment. The evaluation of the activities was carried out using a questionnaire which showed that the participants very much awaited the dim sum-making training because this processed food is very popular, easy to work with, can be applied directly both for daily menus that have complete nutritional content, and has the potential to be sold.

Proximate Compositions and Biological Activities of Caulerpa lentillifera Risa Nofiani; Sigit Hertanto; Titin Anita Zaharah; Sutarman Gafur
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

Caulerpa lentillifera is an edible and functional seaweed due to its high nutritional compositions and its biological activities. In this study, C. lentillifera was evaluated for its proximate compositions (moisture, ash, protein, lipid and fiber contents) and its biological activities (antimicrobial, anti-oxidant, and toxicity). Moisture content, crude lipid, crude protein, and crude fiber were determined using oven method, soxhlet extraction, semi-micro Kjeldhal, and hydrolysis, respectively. Fresh C. lentillifera of Natuna Island, Indonesia, showed its higher level content of ash, crude lipid, and crude fiber compared to that of fresh C. lentillifera of Penghu, Taiwan. For its biological activity assays, the extracts were prepared from fresh and dry C. lentillifera (FC and DC). Both of the extracts showed the broad spectrum of weak antimicrobial using well-diffusion agar tests and antioxidant activities using a modified linoleic acid emulsion system. The toxicity for both extracts was determined using brine shrimp lethality test. DC extract showed its very low toxicity level and there was no toxicity for FC. Hemolytic activity was determined using red blood assay. Both extracts showed their low hemolytic activities (about 5-13%) for the concentration of 100 and 150 μg/mL, but the activity increased sharply (about 96%) on the concentration of 200 μg/mL. It was concluded that C. lentillifera has a potency as a functional food due to containing secondary metabolites with various biological activities.

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.

Optimasi dan Validasi Metode Penentuan Kadar Asam Glikolat dan Asam Laktat Dalam Krim Menggunakan Kromatografi Cair Kinerja Tinggi Devi Wulandari; Gusrizal Gusrizal; Titin Anita Zaharah
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 1 (2020): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Telah dilakukan optimasi dan validasi metode penentuan asam glikolat dan asam laktat dalam krim menggunakan kromatografi cair kinerja tinggi. Pemisahan asam glikolat dan asam laktat dilakukan pada kolom fasa balik C-8menggunakan fasa gerak asam ortofosfat 0,1% dengan pH 3,5 dan detektor UV-Visible. Standar asam glikolat dan asam laktat dibuat dengan melarutkannya menggunakan asam ortofosfat 0,1% pH 3,5. Hasil eksperimen menunjukkan bahwa pada rentang konsentrasi 25 â€“ 400 Î¼g/mL, asam glikolat dan asam laktat memiliki kurva yang linear dengan koefisien korelasi masing-masing 0,9997 dan 0,9999. Uji presisi untuk larutan standar berkonsentrasi 100 Âµg/mL menghasilkan simpangan baku relatif sebesar 1,49% untuk asam glikolat dan 1,72% untuk asam laktat. Metode yang telah dioptimasi memberikan akurasi yang baik yang ditunjukkan oleh nilai perolehan kembali dari pengukuran tiga spiked sample dengan konsentrasi berbeda (50, 100, dan 150 Î¼g/mL). Nilai perolehan kembali untuk masing-masing konsentrasi spiked sample adalah 97,12% Â± 0,69; 98,76% Â± 0,43; 100,80% Â± 0,29 untuk asam glikolat dan 97,58% Â± 0,39; 96,20% Â± 0,68; 98,00% Â± 0,38 untuk asam laktat. Batas deteksi dan batas kuantisasi untuk asam glikolat adalah 0,05 dan 0,17 Î¼g/mL, sedangkan untuk asam laktat adalah 1,40 dan 4,67 Î¼g/mL. Nilai kekasaran metode untuk asam glikolat pada hari pertama dan hari kedua adalah 1,43% dan 1,67%, sedangkan untuk asam laktat adalah 1,67% dan 1,25%. Metode yang telah dioptimasi dan divalidasi berpotensi untuk digunakan secara spesifik pada penentuan kadar asam glikolat dan asam laktat dalam krim.Optimization and Validation of Determination Methods of Glycolic Acid and Lactic Acid in Cream Using High-Performance Liquid Chromatography. A high-performance liquid chromatography analytical method for the determination of glycolic acid and lactic acid in creams has been optimized and validated. The separation was performed in a reverse phase Câ€“8 column with a mobile phase of 0.1%, orthophosphoric acid at pH 3.5, and UV-Visible detector. The standard of glycolic acid and lactic acid was dissolved in 0.1% orthophosphoric acid at pH 3.5. The experimental results showed that in the concentration range of 25â€“400 Î¼g/mL, glycolic acid and lactic acid showed a linear curve with a correlation coefficient of 0.9997 and 0.9999, respectively. The precision test for standard solutions containing 100 Âµg/mL resulted in a relative standard deviation of 1.49% for glycolic acid and 1.72% for lactic acid. The optimized method provided good accuracy indicated by the recovery of the measurement of three spiked samples in different concentrations (50, 100, and 150 Î¼g/mL). The recovery for each concentration of the spiked sample was 97.12% Â± 0.69; 98.76% Â± 0.43; 100.80% Â± 0.29 for glycolic acid and 97.58% Â± 0.39; 96.20% Â± 0.68; 98.00% Â± 0.38 for lactic acid. The limit of detection and limit of quantization for glycolic acid was 0.05 and 0.17 Î¼g/mL, and for lactic acid was 1.40 and 4.67 Î¼g/mL. The ruggedness of the method for glycolic acid on the first day and second day was 1.43% and 1.67%, while for lactic acid, it was 1.67% and 1.25%. The method that has been optimized and validated shows the potential to be used specifically for the determination of glycolic acid and lactic acid in the cream.

Characteristics of Chlorella sp Biomass Immobilized on Chitosan (Chlo-Kit) for Adsorption of Chromium(III) Solution Titin Anita Zaharah; Anis Shofiyani; Endah Sayekti
ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.11.1.102.15-28

Properties of biosorbent prepared from biomass of Chlorella sp immobilized on chitosan (Chlo-Kit) have been studied for adsorption of Chromium(III). Chlo-Kit adsorbent prepared by following steps: dissolving chitosan to get hydrogel form, immobilization of biomasson chitosan hydrogel, beads formation and crosslinkingthe adsorbent beads using epichlorohydrin reagent.Characterization using FT-IR spectrophotometry and SEM showed that mechanism of biomass immobilization on chitosan involves electrostatic interactions between the functional groups of such both materials. Biomass immobilized on chitosan (Chlo-Kit) showed the higher stability in acid medium than un-immobilized biomass. Adsorption of Cr(III) metal ion on Chlo-Kit occured at optimum pH of 4-5 and followed well the Langmuir adsorption isotherm model. The adsorption capacity of Cr(III) on Chlo-Kit was 68.965 mg/g, about 91% higher than that on Chlorella biomass

KAJIAN KETAHANAN BETON DENGAN TAMBAHAN CAMPURAN FLY ASH DAN LIMBAH KARBIT DALAM MEDIA ASAM DAN GARAM (DURABILITY STUDY OF SELF COMPACTING CONCRETE WITH ADDED A MIXTURE OF FLY ASH AND CALCIUM CARBIDE WASTE IN ACID AND SALT MEDIUM) Illen Stevani; Titin Anita Zaharah; Imelda Hotmarisi Silalahi
Indonesian Journal of Pure and Applied Chemistry Vol 6, No 2 (2023)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v6i2.62858

Cement is one of the building blocks of concrete. However, it releases about one ton of carbon dioxide (CO2) gas for every ton of cement produced. Therefore, it is necessary to replace cement in the manufacture of concrete. It is known that a mixture of fly ash and calcium carbide waste has a chemical composition that resembles cement containing silica, alumina, and calcium oxide compounds so that it has the potential to replace cement in making self-compacting concrete. This research was conducted by utilising fly ash waste and carbide waste as additional materials to replace the use of cement by 35% in self compacting concrete. The composition of the waste used in the concrete mix in this study consisted of 25% fly ash waste and 10% calcium carbide waste. Analysis of the elemental composition of self-compacting concrete containing fly ash and calcium carbide waste was obtained from XRF data, the compressive strength of self-compacting concrete samples was tested, their resistance in acid and salt media was studied through the results of compressive strength test analysis, then compared with self-compacting concrete containing 100% cement. The XRF results showed that the elemental composition of the mixture of fly ash, calcium carbide waste, and cement was similar to that of cement alone, but the CaO and SiO2 content of the mixture was still higher than that of cement alone. Based on the compressive strength test analysis results, it was found that the compressive strength values of the self-compacting concrete samples were lower than the compressive strength values of the control of self-compacting concrete samples (cement only). Self-compacting concrete samples soaked in acid and salt media for 28 days showed a decrease in compressive strength, both in self compacting concrete containing a mixture of fly ash, calcium carbide waste, and cement, and concrete containing only cement. The compressive strength values of the fly ash and calcium carbide waste on self-compacting concrete samples in this study were at the range of 28 MPa to 29 MPa, still within the SNI 2847-2019 quality standard, which is the normal concrete quality standard with a compressive force of 15-30 MPa, even though they have been exposed to acid or salt. This allows efforts in replacing cement in self compacting concrete by adding the composition of fly ash waste and calcium carbide waste.

Title

Found 10 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 10 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 10 Documents
Search