Jurnal Online KIMIA FMIPA (Fakultas Matematika & Ilmu Pengetahuan Alam), Universitas Mulawarman
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ADSORPSI METHYLENE BLUE OLEH ARANG AKTIF KULIT BUAH LAI (Durio kutejensis (Hassk.)Becc.)
No full textResearch has been carried out on the adsorption of methylene blue dye with activated charcoal adsorbent prepared from the peel of Lai fruit (Durio Kutejensis (Hassk.) Becc.). This research aims to determine the adsorption characteristics of activated charcoal prepared by the carbonization method at 450°C for 1 hour in a furnace and activated by soaking and shaking in a 2 M HCl activator solution for 24 hours. Characterization of the functional groups of compounds in activated charcoal was carried out using Fourier Transform Infra-Red (FTIR) spectroscopy. The surface morphology of activated charcoal studied by Scanning Electron Microscopy (SEM) shows a large number of pores. The FTIR spectrum of fruit peel activated charcoal reveals the O-H group at wave number 3425.58 cm-1, the C-H group at wave number 2924.09 cm-1, the aromatic C-H group at wave number 1442.75 cm-1, the C-O group at wave number 1319 .31 cm-1. The optimum conditions for adsorption of methylene blue dye were achieved at optimum pH 9, optimum time 60 minutes, optimum temperature 30°C, maximum adsorption capacity 117.965 mg/g by following the Freundlich isotherm and adsorption occurred physically
PEMBUATAN DAN KARAKTERISASI MEMBRAN ELEKTRODA SELEKTIF ION Cu(II) MENGGUNAKAN IONOFOR Na2S SEBAGAI SENSOR KIMIA
Full text linkPreparation and characterization of Cu(II) ion selective electrode membranes based on polyvinyl chloride (PVC) using sodium sulfide (Na2S) as the ionophore has been done. The use of PVC polymer functions as a material that strengthens the properties of the membrane mixed with Na2S to form a homogeneous membrane and can reduce the risk of leaks in the membrane used. However, PVC has stiff properties, so a plasticizer in the form of DOP was needed to reduce intermolecular forces and make the membrane elastic. The preparation was carried out with the composition Na2S : PVC : DOP, namely 6 : 3 : 1. The membrane was doped with CuSO4 solution for 7 days and the Cu2+ ESI performance was measured to increase the optimal conductivity of the membrane, it is done by doping the membrane, namely by inserting 1 M Cu2+ dopant metal. The ESI Cu2+ performance results show a solution composition of 1:2 CuSO4:KNO3 and works well in the composition range 10-5 - 10-1 M, with a Nernst factor value of 28.9 mV/decade and a detection limit of 1.01×10-5 M. The response time of ESI Cu2+ was 10-60 seconds and can be used for 3 days. ESI Cu2+ works in the pH range 4-6 and the presence of interfering ions Cd2+, Zn2+, Cl-, NO3- and SO42- does not affect the performance of ESI Cu2+
AKTIVITAS AMILASE PENDEGRADASI PATI MENTAH DARI BAKTERI AIR SUNGAI KARANG MUMUS
Full text linkRaw starch degrading amylase (RSDA) is an enzyme that can degrade raw starch into glucose without going through the gelatinization process. This research was conducted to isolate RSDA producing bacteria originating from the Karang Mumus River in Samarinda City. Bacterial isolation was carried out using the spread plate method. Screening for RSDA producing bacteria using nutrient media containing raw starch. The results of bacterial isolation obtained 14 single colonies of bacteria. A total of 5 bacterial colonies out of 14 bacteria were able to produce RSDA. Then the RSDA enzyme from the 5 bacteria was tested for amylase activity quantitatively using the dinitrosalicylic acid (DNS) method. Then, of the 5 bacteria, 1 bacterium with the colony code KM 5 had the highest activity, namely 0,332 U/mL
IMPLEMENTASI PBL-STEAM TERINTEGRASI ETNOSAINS UNTUK MELATIH BERPIKIR KREATIF PADA MATERI ASAM BASA
Full text linkThis research aims to determine the implementation of integrated PBL-STEAM ethno-science to train the creative thinking skills of eleventh-grade students at SMA Negeri 4 Samarinda on the topic of acids and bases, specifically the theory and indicators of acids and bases. This study employs a Quasi-Experimental design with a Posttest Only Control Design type. The population in this research consists of all eleventh-grade students at SMA Negeri 4 Samarinda for the academic year 2023/2024. Sampling was conducted using cluster random sampling techniques. The instrument used to measure students\u27 creative thinking is a post-test questionnaire. Data analysis was performed using a t-test, which yielded a significance (2-tailed) of 0,017 < 0,050 for both classes, indicating that Ha is accepted, with the statement that there is an implementation of integrated PBL-STEAM ethno-science on students\u27 creative thinking skills regarding the topic of acids and bases, specifically the theory and indicators of acids and bases.
Keywords : PBL-STEAM, Ethnoscience, Creative Thinkin
Pembuatan Arang Aktif Kulit Buah Tarap (Artocarpus odoratissimus B.) dan Komposit Fe3O4-Arang Aktif Kulit Buah Tarap Sebagai Adsorben Logam Kadmium (Cd)
No full textTarap (Artocarpus odoratissimus B.) is a species of the genus Artocarpus and belongs to the Moraceae family. In its use, fruit cores, skins, and leaves can become metal adsorbents. This research aims to determine the characteristics and adsorption capacity of tarap fruit skin, which can be an alternative to dealing with cadmium (Cd) metal pollution. Making activated charcoal adsorbent tarap fruit peel was carbonated at a temperature of 450ºC for 1 hour and activated using 2 M HCl, while the Fe3O4-activated charcoal composite tarap fruit peel was made using the coprecipitation method from FeSO4.7H2O and FeCl3.6H2O with a mole ratio of 1:1 and then combined with tarap fruit peel activated charcoal to adsorb cadmium metal using the batch method, which is separated using an external magnet and analyzed using an Atomic Absorption Spectrophotometer. The results of FT-IR characterization on both adsorbents contained C-O and O-H groups and on the Fe3O4-activated charcoal composite of tarap fruit peel, there were Fe-O groups. The XRD difactogram shows that there is a Fe3O4 diffraction pattern with relatively small intensity in the Fe3O4-activated charcoal composite of tarap fruit peel. The results of VSM analysis show that the Fe3O4-activated charcoal composite of tarap fruit peel is paramagnetic. The optimum conditions for the adsorption of cadmium metal on activated charcoal from tarap fruit peel were at pH 7 with a contact time of 60 minutes and on the Fe3O4-activated charcoal composite from tarap fruit peel at pH 6 with a contact time of 45 minutes. The maximum adsorption capacity of activated charcoal from tarap fruit peel is 11.1316 mg/g and for the Fe3O4-activated charcoal composite tarap fruit peel is 22.9510 mg/g
FORMULASI DAN EVALUASI GRANUL EKSTRAK ETANOL RIMPANG KUNYIT (Curcuma longa L.) DENGAN METODE GRANULASI BASAH
Full text linkTurmeric Rhizome (Curcuma longa L.) is a plant from the Zingiberaceae family that is commonly used as a food coloring and fragrance. Turmeric rhizome extract which has the chemical content of turmeric, including curcuminoid compounds, provides benefits as a medicine for body health. This study aims to develop a granule preparation containing turmeric rhizome extract (Curcuma longa L.), determine the physical properties of the resulting granules and determine the level of panelist preference for the turmeric rhizome extract granule preparation. Granules are made using the wet granulation method, the mass of the resulting granules is then evaluated with several tests such as: organoleptic test, flow rate test, angle of repose test, density and compressibility test, water content test, and granule size distribution test. The resulting granules have a slight turmeric odor and a yellowish color from the extract and are in the form of coarse granules. The turmeric rhizome extract formula meets the requirements for flow rate, angle of repose, compressibility, water content, but for the granule size distribution test it does not meet the requirements. Turmeric rhizome extract was formulated into a granular preparation with the results of the flow rate test of 17.85 g/second, angle of repose of 17.21º, compressibility index value of 13.2%, water content of 3.63%, particle size distribution value produced a percentage of fines of 38.18% indicating a percentage of fines that did not meet the requirements. And the level of panelists\u27 preference for the preparation of turmeric rhizome extract granules can be accepted well.
Keywords: Turmeric Rhizome, Wet Granulation, Evaluation of Granular Preparations
BEBERAPA JENIS METABOLIT SEKUNDER YANG BERPOTENSI SEBAGAI ANTI KANKER : A MINI REVIEW
Full text linkCancer is one of the leading causes of death worldwide, including in Indonesia. This review explores the potential of various plants as sources of anticancer compounds through secondary metabolite analysis. Plants such as Rosa damascena, Wild Onion (Scorodocarpus borneensis Becc), and Acalypha Indica have been studied for anticancer activity using in vitro methods. The results showed that extracts from Rosa damascena had varying IC50 values against various types of cancer cells, including 16.28 μg/mL in liver cancer cells (HepG-2) and 18.09 μg/mL in breast cancer cells (MCF-7). In addition, Wild Onion showed very strong anticancer activity with an IC50 value of 1.1061 μg/mL in L1210 leukemia cells. Secondary metabolites such as flavonoids, alkaloids, and tannins were identified as key components contributing to the anticancer effects. These findings highlight the importance of further research to develop more effective and safe plant-based cancer therapies.
Keyword: Anticancer, Cancer, Secondary Metabolites, Plant
ELEKTRODEKOLORISASI LIMBAH CAIR INDUSTRI SARUNG TENUN SAMARINDA MENGGUNAKAN ELEKTRODA PbO2/Pb DARI AKI BEKAS
Full text linkElectrodecolorization of liquid waste from the Samarinda woven sarong industry using PbO2/Pb electrode has been conducted. The purpose of this study was to decolorize woven sarong wastewater samples using the electrodecolorization method using lead dioxide (PbO2) as the anode and lead (Pb) as the cathode. Electrodecolorization is carried out by varying working potential, Na2SO4 electrolyte concentration, time and electrode distance. The dye concentration was determined using a UV-Vis spectrophotometer. The research results showed that the optimum conditions for electrodecolorization of woven sarong wastewater samples were using PbO2/Pb electrodes, namely with a working potential of 6 volts, a Na2SO4 electrolyte concentration of 0.25 M, a time of 60 minutes, and a distance of 1 cm. The percentage of decolorization of Samarinda woven sarong wastewater samples using PbO2/Pb electrodes, at maximum conditions was 98,75%.
 
POTENSI PEMANFAATAN LIMBAH ORGANIK RUMAH TANGGA MENJADI PUPUK ORGANIK CAIR MELALUI PROSES FERMENTASI MENGGUNAKAN BIOAKTIVATOR EM4
Full text linkDesa Girimukti is a village of East Kalimantan, Penajam Paser Utara. According to data for 2021, a privately owned area of around 16,000 ha will have a population of 6,730 persons and 1,908 occupied homes. The rising creation of garbage, especially home organic waste, is being caused by a sizable population. If handled improperly, it will contaminate the environment. Utilizing fermentation to transform trash into liquid organic fertilizer is one solution that is possible. Study In order to produce liquid organic fertilizer, it is necessary to know the ideal ratio of organic waste to bioactivator as well as the best fermentation time to obtain the highest nutritional content. In this research, EM4, water, and sugar are added to a reactor that already has household organic waste present in the form of vegetables. In order to test the macronutrient content, which includes C-organic, N, P, K, and pH, samples were taken on days 5, 10, and 15 of the 15-day fermentation process. In this study, the addition ratio of EM4 to vegetable waste was 30:100, with a lengthy fermentation period of 10 days. This provided the finest liquid organic fertilizer. The best pH, C-organic content, N, P, and K contents are 11.99%, 4.45%, 5.54%, 4.8200%, and 6.82, respectively. The produced liquid organic fertilizer satisfies the requirements for quality of MOA 70 of 2011
