Open Access journal ISSN (Print) 2620-3960 - ISSN (Online) 2615-8582 This journal is no longer being updated because: the publisher no longer provides RSS feeds
Authors:Risna Jupri, St Fauziah, Paulina Taba Pages: 105 - 120 Abstract: Molecularly Imprinted Polymer (MIP) is an intelligent synthetic material because it has the ability to selectively recognize target molecules. This study aims to synthesize, characterize and analyze the performance of MIP. MIP material was synthesized using di-(2-Ethylhexyl) phthalate (DEHP) as a template molecule, methyl methacrylate (MMA) monomer combined with ethylene glycol dimethacrylate (EGDMA) as a crosslinker by precipitation polymerization method. MIP materials were characterized by SEM-EDS instrument, FTIR spectrometer, SAA instrument, and UV-Vis spectrophotometer. The test variables for the adsorption ability of MIP material on DEHP compounds were time and concentration. The results showed that the synthesized MIP was in the form of a coarse white solid with a stiff texture. Characterization with the EDS instrument showed a decrease in the mass percent of C and percent of C atoms which indicated the formation of MIP_DEHP_MMA-co-EGDMA(TE) and the surface morphology characterized by the SEM instrument was composed of small grains that tend to be uniform and have pores. The bonds that affect the formation of polymers characterized by FTIR were –C=C, –C=O, and –CO. Characterization with the SAA instrument was 142,2770 m2/g, the total pore volume was 0,2616 cm3/g and the average pore radius was 7.3562 nm, indicating mesoporous material. The optimum time for adsorption of MIP_DEHP_MMA-co-EGDMA(TE) to DEHP was 120 minutes. MIP_DEHP_MMA-co-EGDMA(TE) followed the pseudo-second-order kinetics model and the adsorption obeyed the Freundlich adsorption isotherm PubDate: 2022-10-31 DOI: 10.26418/indonesian.v5i3.59132 Issue No:Vol. 5, No. 3 (2022)
Authors:Azzizah Laila, Harlia Harlia, Rudyansyah Rudyansyah Pages: 121 - 129 Abstract: The chemical structure of fatty acid compounds in plant parts other than seeds and fruit is still not widely known even though it has various benefits. One of the plants known to contain fatty acid compounds is Langsat. This research was conducted to characterize the structure of fatty acid compounds and the content of secondary metabolites in the roots of the langsat plant. The fatty acid characterization process was carried out by spectroscopy while the secondary metabolite content was analyzed by phytochemical screening test. Based on the spectrum of Proton Nuclear Magnetic Resonance (H-NMR) in acetone-d6 solvent at a frequency of 500 MHz, chemical shift data were obtained at 0.89 ppm (t, 3H), 1.33 ppm (m, 6H), 1.63 ppm (m, 2H), 2.33 ppm (t, 2H) and 8.14 ppm (s, 1H) and the results of phytochemical tests on the methanol extract of langsat root are known to contain alkaloids, terpenoids, flavonoids, phenolics, and saponins. Based on these data and compared with the literature, it is suspected that L1 isolates have similarities with the structure of compounds belonging to the fatty acid group. PubDate: 2022-10-31 DOI: 10.26418/indonesian.v5i3.58016 Issue No:Vol. 5, No. 3 (2022)
Authors:Samira Samira, Warsidah Warsidah, Dwi Imam Prayitno Pages: 130 - 137 Abstract: The waters of Sedanau, Natuna Regency are congested with traffic activities of inter-island transport ships and the construction of docks that have the potential to cause pollution to the aquatic environment. Determination of the levels of heavy metals (Pb) and (Cd) in feather shells (Anadara antiquata) in these waters has been carried out. The purpose of this study was to determine the concentration of heavy metals Pb, Cd in feather shells (Anadara antiquata) which was carried out for 2 time periods, 2020 and 2021 at 2 different sampling stations. Station 1 is close to fishing activities, fishing boat traffic docks and inter-island passenger ships, station 2 is close to fishing boat docks and floating net cages but far from fishing activities and ship traffic. Measurement of the concentration of heavy metals Pb and Cd using the Atomic Absorption Spectrophotometer (SSA) method with reference to the Indonesian National Standard (SNI) Number 06-6992.2-2004 heavy metals Pb and Cd in feather shells (Anadara antiquata). The results of the measurement of heavy metal concentrations of Pb and Cd in feather shells (Anadara antiquata) in the first year were the content of (Cd) at station 1 of 0.0214 g/g, station 2 of 0.0236 g/g and (Pb) of station 1 of 0. 0.0109 g/g, station 2 was not detected, while in the second year the content (Cd) of station 1 was 1.3472 g/g, station 2 was 0.9980 g/g and (Pb) stations 1 and 2 were not detected. heavy metal content. Measurements in the second year of heavy metal content of Pb and Cd were lower than in the first year which had exceeded the threshold allowed in the Indonesian National Standard (SNI) No. 7387 of 2009 concerning the Maximum Limit of Heavy Metal Contamination in Food Lead (Pb) 1.5 mg/kg and Cadmium (Cd) 1.0 mg/kg PubDate: 2022-10-31 DOI: 10.26418/indonesian.v5i3.59125 Issue No:Vol. 5, No. 3 (2022)
Authors:Indra Amin Jaya, Intan Syahbanu, Nelly Wahyuni Pages: 138 - 151 Abstract: The limited source of Lithium (Li) as the main material for battery cathodes has become a problem in the development of the new and renewable energy (EBT) sector. Based on their reduction potential and availability on earth, elements that might be suspected include Potassium (K), Sodium (Na), Magnesium (Mg) and Calcium (Ca). All cannot be obtained from natural ingredients, one of which is blondo. Blondo is a by-product of coconut oil processing that has not been used optimally. This study used the calcination process by varying the time (5, 7, 9 hours) and temperature (450, 550, 650°C) to obtain optimal oxide compounds from blondo. Making the cathode using a mixture of blondo and Polvinyl Alcohol (PVA) with a composition ratio of 20:1 attached to a stainless steel plate. Testing the percentage of oxide compounds was carried out using X-Ray Fluorescence (XRF) which showed that the calcination process caused the percentage levels of oxide compounds to increase K2O, P2O5, MgO and Cl. However, when the calcination time and temperature were increased, it did not give a much different effect on the levels of oxide compounds produced previously. The effect of calcination temperature is known from the results of X-Ray Diffraction (XRD) which shows that the higher the calcination temperature, the smaller the crystal size of the oxide compound. At temperatures of 450, 550 and 650°C the yields are 50.0; 47.5 and 36.4 nm. This is also supported by the results of XRF testing where K2O is the most dominant component of the oxide compound in calcined blondo. The test as a cathode material was carried out for three cycles resulting in an average charge capacity of 14.67 mAh, and an average discharge capacity of 5.34 mAh so that the average efficiency was 55.68%. PubDate: 2022-10-31 DOI: 10.26418/indonesian.v5i3.59225 Issue No:Vol. 5, No. 3 (2022)
Authors:berta juniarty antomy, M Agus Wibowo, Nelly Wahyuni Pages: 152 - 160 Abstract: Magnetic activated carbon (KAM) is used as an absorbent or adsorbent based on coconut shell which has been activated with sodium bicarbonate. The activated carbon is added to the iron composite which produces KAM. The iron composite content in the adsorbent has the ability to absorb and facilitate the separation process on the adsorbate. The purpose of this study was to determine the ability of the adsorbent to absorb the adsorbate, namely the pyrrole monomer compound. The adsorbent was characterized using the Fourier Transform Infra-Red (FTIR) instrument to determine the functional groups present. The adsorption capacity of iodine and methylene blue, adsorption isotherm, and adsorption kinetics were analysis. The adsorption isotherm was determined by varying the pyrrole concentration from the range of 30; 40; 50; 60 and 70 ppm. Determination of time variation was also carried out on adsorption kinetics with a range of 1; 1.5; 2; 2.5 and 3 hours. The FTIR spectrum produces Fe-O functional groups with an absorption peak of 556 cm-1, indicating the presence of a magnetic composite that has been attached to carbon. The adsorption capacity of iodine and methylene blue on magnetic activated carbon are 527 mg/g and 699 mg/g, respectively. The adsorption kinetics on KAM with the first-order model resulted in a value of R2=0.7736 PubDate: 2022-10-31 DOI: 10.26418/indonesian.v5i3.54948 Issue No:Vol. 5, No. 3 (2022)
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