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ALCHEMY Jurnal Penelitian Kimia
ISSN : 14124092     EISSN : 24434183     DOI : -
ALCHEMY Jurnal Penelitian Kimia is a chemistry journal published by Sebelas Maret University, Surakarta. ALCHEMY Jurnal Penelitian Kimia publishes original research articles or review articles in organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry, and environmental chemistry.
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Articles 139 Documents
PENGARUH PELAPISAN KITOSAN-NISIN TERHADAP KUALITAS IKAN SIDAT (ANGUILLA BICOLOR BICOLOR) SELAMA MASA PENYIMPANAN PADA SUHU RENDAH Kusumaningsih, Triana; Martini, Tri; Utami, Tika Diah
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): Vol 15, No 2 (2019) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (485.078 KB) | DOI: 10.20961/alchemy.15.2.33892.251-271

Abstract

Telah dilakukan penelitian mengenai preparasi dan karakterisasi pelapisan kitosan nisin terhadap kualitas ikan sidat (Anguilla bicolor bicolor) selama penyimpanan pada suhu rendah. Penyimpanan dilakukan selama 8 hari pada suhu 5 ± 2 °C. Nisin sebanyak (0, 2, 4, 6 dan 8 g) ditambahkan ke dalam larutan kitosan 1% (b/v), sehingga diperoleh lima larutan pelapis, yaitu kitosan 1,0% dan kitosan-nisin: 0,2; 0,4; 0,6 dan 0,8% (b/v). Pelapis kitosan-nisin optimal diketahui melalui pengamatan terhadap perubahan fisik daging. Tebal lapisan kitosan-nisin diamati menggunakan analisis SEM. Parameter yang diukur selama penyimpanan adalah nilai pH, nilai jumlah cemaran mikroba dengan metode Total Plate Count (TPC), kadar air, kadar lemak dan kadar protein. Hasil penelitian menunjukkan bahwa berdasarkan perubahan fisik selama penyimpanan, konsentrasi kitosan-nisin sebesar 0,6% (b/v) merupakan konsentrasi optimal untuk mempertahankan kualitas ikan sidat. Tebal lapisan kitosan-nissin adalah (0,529 ? 0,554) mm. Ikan sidat terlapis kitosan-nisin mengalami penurunan kadar proksimat (air, lemak dan protein), peningkatan nilai pH dan jumlah cemaran mikroba yang lebih rendah dibandingkan ikan tanpa pelapisan. Hal tersebut menunjukkan bahwa pelapisan kitosan-nisin pada ikan sidat dapat mempertahankan kualitas ikan sidat selama penyimpanan pada suhu rendah.Effect of Chitosan-Nisin Coating on Quality of Eel (Anguilla bicolor bicolor) during the Storage Period at Low Temperature. The research of the preparation and characterization of chitosan-nisin as a coating layer on the eel (Anguilla bicolor bicolor) were studied. The quality of the eels after coating was observed during storage at low temperatures. The storage was carried out for 8 days at a temperature of 5 ± 2 °C. A various mass of nisin as much as (0, 2, 4, 6 dan 8 g) was added to 1% (b/v) chitosan solution, thus five coating solutions were obtained, namely 1.0% chitosan and chitosan-nissin 0,2; 0,4; 0,6 and 0,8% (w/v), respectively. The optimalization of chitosan-nisin coating was known through the observation of the physical changes of meat. The thickness of chitosan-nisin layer was observed using scanning electron microscopy (SEM) analysis. The parameters measured during storage are pH value, the amount of microbial contamination using the total plate count (TPC) method, water content, fat content and protein content. The results showed that based on the physical changes during storage, the concentration of chitosan-nisin of 0.6% (w/v) was the optimal concentration to maintain the quality of eel. The thickness of the chitosan-nissin layer was observed of 0.529 ? 0.554 mm. Chitosan-nisin coated eel decreased proximate levels (water, fat and protein), increased pH value and lower amount of microbial contamination compared to fish without coating. These phenomena show that the chitosan-nisin coating can maintain the quality of eel during storage at low temperatures.
PENERAPAN DESAIN EKSPERIMEN PLACKETT-BURMAN DAN BOX-BEHNKEN PADA ANALISIS VOLTAMETRI PULSA DIFERENSIAL UNTUK PENENTUAN KADAR SENYAWA KOMPLEKS GD-DTPA Wyantuti, Santhy; Aristantia, Ravenna; Hartati, Yeni Wahyuni; Bahti, Husein H
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 1 (2020): Vol 16, No 1 (2020) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (123.761 KB) | DOI: 10.20961/alchemy.16.1.35166.140-151

Abstract

Gadolinium merupakan salah satu golongan unsur tanah jarang yang menarik karena memiliki sifat paramagnetik yang tinggi. Pengkhelatan gadolinium dengan ligan dietilentriaminpentaasetat (DTPA) menghasilkan senyawa yang berguna dalam bidang kesehatan. Tujuan dari penelitian ini adalah menentukan kandungan unsur tanah jarang gadolinium sebagai kompleks dengan ligan DTPA secara voltametri pulsa diferensial dengan penerapan desain eksperimen Plackett-Burman dan Box-Behnken. Desain eksperimen Plackett-Burman digunakan untuk menyeleksi parameter yang memiliki relevansi positif terhadap respon arus. Parameter yang terpilih kemudian dioptimasi melalui desain eksperimen Box-Behnken sehingga diperoleh kondisi optimum tiap parameter. Parameter yang terseleksi meliputi konsentrasi ligan DTPA, waktu deposisi dan waktu kesetimbangan dengan nilai tiap parameter pada kondisi optimum masing-masing yaitu 150, 13 mgL-1, 60 detik dan 30 detik.  Berdasarkan hasil pengukuran pada kondisi optimum didapat nilai presisi dan akurasi untuk kompleks Gd-DTPA yaitu 99,79% dan 93,42% dengan nilai limit deteksi dan kuantisasi untuk kompleks Gd-DTPA yaitu 3,97 mg/L dan 10,71 mg/L. The Application of Experimental Designs of Plackett-Burman and Box-Behnken in Differential Pulse Voltammetry Analysis for Gd-DTPA Complex Detection. Gadolinium is one of rare earth elements that is interesting because it has high paramagnetic properties. The gadolinium chelating with diethylentriaminpentaacetic acid (DTPA) ligands produces useful compounds in the health field. The purpose of this experiment is to determine amount of gadolinium as complex with DTPA on differential pulse voltammetry by applying Plackett-Burman and Box-Behnken experimental design. The method employed experimental design of Plackett-Burman to select factors, which have positive relevance to response. The selected factors are optimized based on experimental design of Box-Behnken to obtain the optimum condition each factors. The selected factors are ligand concentration, deposition time and equilibrium time with optimum value of 150 mgL-1, 60 s and 30 s, respectively. Based on the result of measurement at optimum condition, the precision and accuracy value for Gd-DTPA complex is 99.79% and 93.42% with detection and quantization limit value for Gd-DTPA complex is 3.97 mg/L and 10.71 mg/L.
IN-VIVO ANTIPYRETIC EFFECT OF EEL (ANGUILLA BICOLOR BICOLOR) OIL ON YEAST-INDUCED FEVER ON MICE Sasongko, Heru; Rahmawati, Aulia Ayu; Farida, Yeni; Sugiyarto, Sugiyarto
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): Vol 15, No 2 (2019) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (271.369 KB) | DOI: 10.20961/alchemy.15.2.27086.219-227

Abstract

Fish oil has been studied for medicinal purposes, including its antipyretic properties. Eel (Anguilla bicolor bicolor) oil, which contains vitamins and fatty acids, including Omega-3 (EPA and DHA), is also expected to have the antipyretic effect. This research aimed to examine the antipyretic activity of eel oil on white mice (Mus musculus L.). An in-vivo study was done on thirty Swiss-Webster strain males mice that previously got 20% yeast-induced fever. Six treatments were applied including normal group (untreated), a negative control group (yeast-treated), a positive control group treated with acetaminophen (1.764 mg/20 g body weight), and three groups treated with eel oil (0.048, 0.096 and 0.192 g/20 g body weight, respectively). The data was analyzed statistically using one way ANOVA then was continued with LSD post hoc test. The results showed that eel oil has significantly reduced yeast-induced hyperthermia on mice five hours after application at doses 0.096 and 0.192 g/20 g body weight. Our finding suggests that eel oil possess antipyretic properties when was applied in certain doses, and this effect is presumably attributed to its high content of fatty acid, including EPA and DHA.
OPTIMASI DAN VALIDASI METODE PENENTUAN KADAR ASAM GLIKOLAT DAN ASAM LAKTAT DALAM KRIM MENGGUNAKAN KROMATOGRAFI CAIR KINERJA TINGGI Wulandari, Devi; Gusrizal, Gusrizal; Zaharah, Titin Anita
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 1 (2020): Vol 16, No 1 (2020) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (434.847 KB) | DOI: 10.20961/alchemy.16.1.34008.10-24

Abstract

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 ? 400 ?g/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 µg/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 ?g/mL). Nilai perolehan kembali untuk masing-masing konsentrasi spiked sample adalah 97,12% ± 0,69; 98,76% ± 0,43; 100,80% ± 0,29 untuk asam glikolat dan 97,58% ± 0,39; 96,20% ± 0,68; 98,00% ± 0,38 untuk asam laktat. Batas deteksi dan batas kuantisasi untuk asam glikolat adalah 0,05 dan 0,17 ?g/mL, sedangkan untuk asam laktat adalah 1,40 dan 4,67 ?g/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 C?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 25?400 ?g/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 µg/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 ?g/mL). The recovery for each concentration of the spiked sample was 97.12% ± 0.69; 98.76% ± 0.43; 100.80% ± 0.29 for glycolic acid and 97.58% ± 0.39; 96.20% ± 0.68; 98.00% ± 0.38 for lactic acid. The limit of detection and limit of quantization for glycolic acid was 0.05 and 0.17 ?g/mL, and for lactic acid was 1.40 and 4.67 ?g/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.
THE TEMPERATURE EFFECT ON ULTRASONIC-ASSISTED OF SYNTHESIS METHYL FERULATE AND ITS ANTIPLATELET ASSAY Ekowati, Juni; Pratama, Rian Putra; Nofianti, Kholis Amalia; Diyah, Nuzul Wahyuning
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): Vol 15, No 2 (2019) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (92.467 KB) | DOI: 10.20961/alchemy.15.2.29914.272-286

Abstract

Ferulic acid (FA) has been reported to have antiplatelet activity through indirectly inhibiting P2Y12 receptor. In order to increase the activity of FA, by improving its lipophilicity, so that it is easier to enter the cell, synthesis methyl ferulate was conducted through Fisher esterification. Ultrasonic waves were utilized as source of energy emitted through water as the medium at two various of temperature, i.e., 55 °C and 65 °C. The purposes of this study are to produce methyl ferulate and to determine the reaction constant rate (k) and its energy activation (Ea), at temperature of 55 °C and 65 °C. Moreover, the biological activity as antiplatelet was investigated at dose 20 mg/kg BW. The antiplatelet assay was conducted by clotting time and bleeding time methods. The results were analyzed by one way ANOVA program (P<0.05). The yield of methyl ferulate are 50.3% and 67.1% at 55 °C and 65 °C, respectively. The k value at 55°C is 4x10-5 cons-1min-1, while that of at 65 °C is 9x10-5 cons-1min-1. The clotting time and bleeding time of methyl ferulate obtained were 265 sec and 175 sec, respectively. The antiplatelet activity of methyl ferulate is better than ferulic acid.
OPTIMASI DAN VALIDASI METODE KROMATOGRAFI CAIR KINERJA TINGGI UNTUK MENETAPKAN KADAR ASAM KLOROGENAT DALAM EKSTRAK ETANOL DAUN YAKON (SMALLANTHUS SONCHIFOLIUS (POEPP. & ENDL.) H. ROBINSON) Aziz, Zuhelmi; Nurhidayati, Liliek; Abdillah, Syamsudin; Yuliana, Nancy Dewi; Simanjuntak, Partomuan
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 1 (2020): Vol 16, No 1 (2020) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4044.619 KB) | DOI: 10.20961/alchemy.16.1.28952.66-76

Abstract

Yakon merupakan tanaman yang dapat digunakan untuk pengobatan dan kebutuhan pangan. Salah satu kandungan zat berkhasiat dalam daun yakon adalah asam klorogenat. Asam klorogenat diketahui memiliki aktifitas sebagai antioksidan, antikanker dan antidiabetes.  Penentuan kadar asam klorogenat dalam matriks yang kompleks diperlukan metode yang selektif dengan ketelitian dan ketepatan yang baik. Pada penelitian ini dilakukan optimasi dan validasi metode kromatografi cair kinerja tinggi (KCKT) fase balik untuk penetapan kadar asam klorogenat. Ekstrak dibuat secara ultrasonikasi menggunakan pelarut etanol 95%. Kondisi optimum diperoleh menggunakan fase gerak asam format 0,1% dalam asetonitril?asam format 0,1% dalam air (gradien); fase diam oktadesilsilan (C18) pada suhu 30 ºC dan detektor UV pada panjang gelombang 328 nm. Metode KCKT ini memberikan hasil yang memiliki ketelitian yang tinggi dengan simpangan baku relatif 0,79% dan ketepatan yang baik dengan perolehan kembali 97,50%. Kadar asam klorogenat yang diperoleh dalam ekstrak etanol 95% daun yakon sebesar 1,02%. Optimization and Validation of High Performance Liquid Chromatography Methods for Determination of Chlorogenic Acid Levels in Ethanol Extracts of Yakon Leaves (Smallanthus sonchifolius (Poepp. & Endl.) H. Robinson). Yacon is a plant that can be used for medication and food needs. One of the bioactive compounds of yacon leaves is chlorogenic acid. Chlorogenic acid has various biological activities, such as antioxidant, anticancer and antidiabetic activities. To determine the chlorogenic acid in such complex matrix, such selective methods with good precision and acuracy are required. In this study, the optimization and validation of reverse phase high performance liquid chromatography (HPLC) method for chlorogenic acid determination were performed. The extract was prepared by ultrasonication in 95% ethanol.The optimized condition for HPLC obtained was by using mobile phase  0.1% formic acid in acetonitrile ? 0.1% formic acid in water with gradient elution, stationary phase octadesylsilane  (C18)  at 30 oC and UV detector at of 328 nm. The result showed that HPLC method had high precicion with relative standard deviation of 0.79% and high accuracy with recovery of 97.50%. The chlorogenic acid in the ethanol 95% extract of Yacon leaves was 1,02%.
THE INFLUENCE OF COATING MATERIAL DIFFERENCE AGAINST ENCAPSULATION EFFICIENCY OF RED GINGER OLEORESIN Jayanudin, Jayanudin; Rochmadi, Rochmadi; Renaldi, M. Kemal; Pangihutan, Pangihutan
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 2 (2017): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (581.881 KB) | DOI: 10.20961/alchemy.13.2.5406.274-286

Abstract

The purpose of this study was to determine the effect of different coating materials on the efficiency of red ginger oleoresin encapsulation and characterization of microcapsule surface. The encapsulation process begins by dissolving chitosan with 1 % (v/v) acetic acid and dissolving sodium alginate using aquadest to be used as a coating material. Red ginger oleoresin alginate included in the solution was stirred. The mixture entered into the chitosan solution and added tween 80 was stirred using a homogenizer to emulsify. The emulsion that forms included in the spray dryer to be converted into a powder of microcapsules, and then analyzes the encapsulation efficiency and surface morphology of microcapsules using scanning electron microscopy (SEM). Differences in the coating material used were chitosan, mixture of chitosan-alginate and mixture of chitosan-alginate-sodium tripolyphosphate (STPP). Weight ratio of red ginger oleoresin and the coating material were 1: 1, 1: 2 and 1: 3. The research results obtained were the highest encapsulation efficiency obtained from the coating material of the chitosan-alginate-sodium tripolyphosphate (STPP) at a ratio of 1: 3, namely by 85 %.
KOMPOSIT POLIANILINA/KITOSAN/PERAK NANOWIRES SEBAGAI ELEKTROKATALIS REAKSI EVOLUSI HIDROGEN DALAM MEDIUM NETRAL Fakhrullah, Fadli; Sugita, Purwantiningsih; Khotib, Mohammad; Akiyoshi, Takeno; Takahashi, Shinya
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): Vol 15, No 2 (2019) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (380.355 KB) | DOI: 10.20961/alchemy.15.2.30460.190-202

Abstract

Studi mengenai elektrokatalis untuk reaksi evolusi hidrogen (HER) dan evolusi oksigen (OER) sangat diperlukan terkait aplikasinya dalam pengembangan energi terbarukan berbasis hidrogen. Komposit perak nanowires (AgNWs) dengan polianilina (PANI) disiapkan dengan metode polimerisasi radikal dalam larutan matriks kitosan untuk menurunkan ukuran partikel PANI. Komposit disintesis dengan 3 perlakuan yang berbeda, yaitu perlakuan suhu ruang, suhu rendah, dan sonikasi. Aktivitas elektrokatalisis diukur dengan voltammetri sapuan linear (LSV). Informasi tentang densitas arus pertukaran dan overpotensial sebagai variabel utama pengukuran aktivitas elektrokatalisis diperoleh dari plot Tafel pada LSV. Semua komposit dengan perlakuan suhu dan sonikasi menunjukkan karakter katodik berdasarkan nilai overpotensialnya yang negatif (aktivitas HER), sedangkan komposit dengan perlakuan suhu rendah memiliki karakter anodik (aktivitas OER).A Composite of   Polyaniline/Chitosan/Silver Nanowires as Hydrogen Evolution Electrocatalyst in Neutral Medium. Study on electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is urgently needed related to its application in hydrogen-based renewable energy development. A composite of silver nanowires (AgNWs) with polyaniline (PANI) was prepared by radical polymerization method in chitosan matrix solution to reduce the PANI particle size. Each composite was synthesized under three different treatment conditions, which are room temperature, low temperature, and sonication. Linear sweeping voltammetry (LSV) was conducted to measure electrocatalytic activity of the composites. Information about exchange current density and overpotential as important variables in this field were obtained from Tafel plot in the LSV. The temperature and sonication-treated composites have cathodic character due to its negative overpotential (HER activity), while low temperature-treated composites have anodic character (OER activity).
UJI EFEKTIVITAS DAN KARAKTERISASI KOMPOSIT TANAH ANDISOL/ARANG TEMPURUNG KELAPA UNTUK ADSORPSI LOGAM BERAT BESI (FE) Pranoto, Pranoto; Martini, Tri; Maharditya, Winda
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 1 (2020): Vol 16, No 1 (2020) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (638.574 KB) | DOI: 10.20961/alchemy.16.1.33286.50-65

Abstract

Penelitian ini untuk mengetahui kapasitas adsorpsi komposit tanah andisol/arang tempurung kelapa sebagai adsorben logam berat besi (Fe) berdasarkan pada kondisi komposisi, pH dan waktu kontak yang optimum. Tanah andisol diaktivasi dengan larutan NaOH 3 M dan arang tempurung kelapa diaktivasi menggunakan larutan HCl 4 M. Komposit tanah andisol/arang tempurung kelapa dibuat dengan mencampurkan tanah andisol dan arang tempurung kelapa pada variasi komposisi 100:0, 75:25, 50:50, 25:75 dan 0:100 (b/b) Uji adsorpsi terhadap logam besi (Fe) dilakukan pada variasi pH larutan 1, 2, 3, 4, 5 dan 6 serta waktu kontak 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, dan 60 menit dengan sistem batch. Pengukuran konsentrasi akhir pada saat kesetimbangan dilakukan dengan menggunakan Atomic Absorption Spectroscopy (AAS).  Hasil karakterisasi adanya proses aktivasi dan pengompositan ditunjukkan pada spektra Fourier Transform Infra Red (FTIR) yang mengalami pergeseran bilangan gelombang. Karakterisasi pola difraksi X-Ray Diffraction (XRD) yang menunjukkan adanya puncak baru. Hasil analisis Scanning Electron Microscope (SEM) komposit menunjukkan bahwa permukaan adsorben telah ditutupi logam besi (Fe). Pembentukan komposit juga menunjukkan adanya peningkatan luas permukaan dan nilai keasaman komposit. Berdasarkan penelitian ini diperoleh bahwa proses adsorpsi terjadi pada kondisi optimum komposisi komposit tanah andisol/arang tempurung kelapa 75:25 (b/b), pH larutan besi (Fe) 5 dan waktu kontak selama 30 menit dengan kapasitas adsorpsi sebesar 0,54 mg/g dan presentase adsorpsi 91,57%. Isoterm adsorpsi mengikuti isoterm Freundlich dengan nilai R2 sebesar 0,9456.Effectiveness Test and Characterization of Andisol Soil/Coconut Shell Charcoal for Adsorption of Iron (Fe). This research aims to determine the adsorption capacity composite of andisol soil and coconut shell charcoal as the adsorbent of iron (Fe) metal based on the composition condition, pH, and optimum contact time. Andisol soil was activated with NaOH 3 M solution, and coconut shell charcoal was activated with HCl 4 M solution. The composites were made under various composition of andisol soil/coconut shell charcoal of 100:0, 75:25, 50:50, 25:75 and 0:100 (w/w). The adsorption test was done on the pH variation of 1, 2, 3, 4, 5, 6 and used the contact time variation of 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 and 60 minutes in a batch method. The concentration analysis of iron (Fe) metal was done by atomic absorption spectroscopy (AAS). The characterization result of the activation process can be shown on the Fourier transform infrared (FTIR) spectra with the shifting peak. Characterization of X-ray diffraction (XRD) diffractogram showed the emergence of a new peak in andisol soil and coconut shell charcoal. The result of scanning electron microscope (SEM) characterization analysis showed that the surface of the adsorbent was covered in iron. The composite formation also showed an increase in surface area and composite acidity value. Based on the result of the research, it can be concluded that the adsorption process happens in the optimum condition in andisol soil/coconut shell charcoal composition of 75:25 (w/w), pH solution iron (Fe) metal of 5 and contact time of 30 minutes. The adsorption capacity was 0.54 mg/g and 91.57% for adsorption percentage. The isotherm adsorption followed Freundlich isotherm with R2 values 0.9456.
SINTESIS KOMPOSIT HIDROKSIAPATIT-LANTANUM OKSIDA (HA-LA2O3) DENGAN METODE HIDROTERMAL SECARA IN-SITU DAN EX-SITU Hutabarat, Geofanny S; Qodir, Dzikri T; Setiawan, Hendri; Akbar, Nur; Noviyanti, Atiek Rostika
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): Vol 15, No 2 (2019) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (246.819 KB) | DOI: 10.20961/alchemy.15.2.32062.287-301

Abstract

Hidroksiapatit (HA) Ca10(PO4)6(OH)2 merupakan senyawa kalsium yang digunakan pada bidang ortopedi dan periodontal karena mineral ini merupakan penyusun utama dalam jaringan tulang dan gigi. Untuk dapat digunakan sebagai graft tulang dan tambal gigi, perlu dilakukan pengaturan kemurninan, kristalinitas dan ukurannya baik sebagai senyawa tunggal (HA) atau kompositnya. Pengaturan tersebut dapat dilakukan melalui proses sintesisnya. Pada penelitian ini HA disintesis dari CaO yang diisolasi dari cangkang telur ayam dengan metode kalsinasi pada suhu 1000 °C selama 5 jam, kemudian ditambahkan diammonium hidrogenfosfat. Sintesis komposit HA-La2O3 dilakukan dengan dua metode hidrotermal dengan dua cara berbeda, yaitu secara in-situ dan ex-situ. Pada sintesis HA dengan metode in-situ dilakukan pencampuran bahan dalam satu tahap yaitu CaO, diammonium hidrogenfosfat dan 5% b/b lantanum oksida dengan perbandingan mol Ca/P=1,67 secara hidrotermal pada 230 °C selama 48 jam. Sintesis HA dengan metode ex-situ dilakukan dengan dua tahap yaitu mencampur CaO dan diammonium hidrogenfosfat untuk membentuk HA. Setelah HA terbentuk kemudian dilakukan sintesis komposit dengan penambahan lantanum oksida. Komposisi bahan dan kondisi reaksi metode ex-situ dilakukan dengan cara yang sama seperti metode in-situ. Hasil XRD dan FTIR menunjukkan terbentuknya komposit HA-La2O3 dari kedua metode yang dilakukan. Namun kemurnian, kristalinitas dan ukuran komposit menunjukan hasil yang berbeda. Karakteristik komposit yang dihasilkan dari metode in-situ lebih baik dibandingkan dengan metode ex-situ.

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