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JKPK (Jurnal Kimia dan Pendidikan Kimia)

jkpk
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Published by Universitas Sebelas Maret

ISSN : 25034146 EISSN : 25034154 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry

The JKPK (Jurnal Kimia dan Pendidikan Kimia) is a national journal, published three times a year in April, August, and December, containing research articles on Chemistry and Chemistry education.

Arjuna Subject : -

Articles 255 Documents

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Gasoline Production from Coconut Oil Using The Ni-MCM-41 and Co/Ni-MCM-41 Catalyst Lailatul Badriyah; Iip Izul Falah
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 1 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Gasoline have been produced from coconut oil using MCM-41, NiMCM-41, and Co/NiMCM-41 catalyst. The acidity of catalyst was analysed by Fourier Transformation Infra-Red Spectroscopy (FTIR). The yields of cracking product were analysed by Gas Chromatography-Mass Spectroscopy (GC-MS). The catalyst of Co/NiMCM-41 has the highest acidity than MCM-41 and NiMCM-41. It is caused by the effect of adding d orbital from Co and Ni. This cracking process is batch system, and the catalyst pellets were made at the temperature of 400 ºC. The highest gasoline product was obtained using the Co/NiMCM-41 catalyst with 89.53 % w/w yield. The major liquid product from the cracking process using MCM-41, NiMCM-41, dan Co/NiMCM-41 catalysts were estimated as 1-octena, octane, nonane; 1-octene, 1-nonene, nonane; 1-octene, octane, nonane, respectively.

Improving Ethanol Permeation Efficiency Using Modified Poly(Vinyl Alcohol) Membrane Ulfa Andayani; Jumina Jumina; Dwi Siswanta; Diah Mardiana
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 3 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

This research is about using blended membrane poly(vinyl alcohol)-pectin that are crosslinked by glutareldehide for ethanol permeation. Poly(vinyl alcohol) or PVA is used as the base membrane, pectin as biopolymers and gluteraldehida (GA) as a crosslinker agent. The objective of this study is improving the efficiency of ethanol permeation using blended PVA membrane with pectin and glutaraldehyde to determine the optimum composition of blended membrane PVA-pectin-GA. Membrane with optimum composition is selected based on the highest flux value. Membrane optimization was obtained by studying the effect of the PVA concentration, the addition of GA and pectin. Moreover, optimization was studied based on membrane permeation rate (flux) of ethanol that passes through the membrane. Membranes with high flux value were selected as the optimum membrane. The results conclude: (1) Addition of gluteraldehide decreased flux values but increased membrane stability. The highest flux value generated from the blended membrane that has cross-linker number (n) 120; (2) Addition of pectin increased flux value but decreased membrane stability. The highest flux value was obtained from blended membrane of PVA-pectin-GA with the optimum composition on mole ratio of PVA: pectin = (1: 2).

Isolation of Ferulic Acid from Leaves of Mindi (Melia azedarach L.) and Its Antioxidant Activity Test Andriyani Budi Listyo; Dewi Kusrini; Enny Fachriyah
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 1 (2018): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Mindi (Melia azedarach L.) is one of a plant from Meliaceae family and has been known for its bioactive compound, such as ferulic acid. On this study, the isolation of ferulic acid and antioxidant activity test has been conducted. The aim of this study was to isolate the ferulic acid on ethanol extract of Melia azedarach L. leaves, determine the ferulic acid content and antioxidant activity test qualitatively. The method used in this research was isolation with hydrolysis (acid and base) and without hydrolysis, determining the phenolic acid content using TLC scanner instrument and antioxidant activity test qualitatively using DPPH radical reduction method. According to the identification using TLC and TLC scanner, the base hydrolysis fraction (HB), acid hydrolysis (HA), and without hydrolysis (HA) of ethanol extract from Melia azedarach L. was suspected contain the ferulic acid compound. The analysis result using TLC scanner was known to have ferulic acid content on HB, HA, and TH fraction of 15.57%,12.17%, and 9.56%, respectively. This study showed that hydrolysis affected the phenolic acid content where the HB fraction produced higher ferulic acid than HA and TH fraction. The antioxidant activity test that has been conducted qualitatively showed that ferulic acid isolates contained on each fraction actively reduce the DPPH radical.

Characteristic Study of the MCM-41 Modified with Zn by Direct Synthesis Nur Hasanah; Sutarno Sutarno; Eko Sri Kunarti
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 3 (2018): JKPK( Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Modification of MCM-41 with zinc (Zn) by direct synthesis has been attempted. The aims of this research were (i) to show morphology of MCM-41, (ii) to know the optimal ratio of Si/Zn in MCM-41 modification, and (iii) to know crystallinity and pore diameter of MCM-41 and MCM-41 modified by Zn. Zn metal added to MCM-41 matrix by direct synthesis used zinc nitrate as precursor with ratio Si/Zn variation. Zn added by direct synthesis to get larger diameter without changing the structure of MCM-41. Characterization of material was used XRD, FTIR, TEM, and N2 adsorption. Characterization of MCM-41 with TEM show that material has spherical shape with uniform pore morphology. The result of XRD show that synthesized MCM-41 has good crystallinity with three peaks observed specific to MCM-41. Ratio of Si/Zn optimal to modification MCM-41 is Si/Zn= 100. Modified MCM-41 show decrease in crystallinity and increase pore diameter that is 35.58 Ǻ compared with MCM-41 with pore diameter 31.42 Ǻ.

Study of Adsorption Capacity of Dibenzotiofen Molecules on Mesoporous Carbon with Pore Geometry Model Maria Ulfa; Farhah Nayla Fawzia
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 2 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Adsorption models in a simple and accurate way to describe the geometry of the pores have been studied and validated experimentally to predict the adsorption capacity dibenzotiofen molecules on mesoporous carbon. The model is designed according to the size of the pore channels of mesoporous carbon and molecular arrangement dibenzotiofen that goes into the pores. To test the accuracy of the model is done by comparation with results of analysis of nitrogen adsorption-desorption to calculate the volume filled. The results showed that the results of the experimental adsorption data are within the range of values of the pore volume of mesoporous carbon. These results indicate that the pore geometry model molecule can accurately predict the adsorption capacity of a molecule in a mesoporous material.

Validation of Atomic Absorption Spectrometry Method for Contamination Determination of Lead (Pb) and Cadmium (Cd) in Methanol Extract and Product of Curcuma xanthorrhiza Roxb. Dedi Hanwar; Devi Eka Nitoviani; Andi Suhendi
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 3 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

The validity of atomic absorption spectrometry method for lead (Pb) and cadmium (Cd) determination in methanol extract and product of Curcuma xanthorrhiza was unknown. The aim of this work is to determine the validity of atomic absorption spectrometry method for Pb and Cd determination in methanol extract and product of Curcuma xanthorrhiza. Digestion process was done by wet digestion method and its results were read by atomic absorption spectrometry at a wavelength 217.0 nm for Pb and 228.8 nm for Cd. Validation results found % recovery of Pb and Cd respectively were 87.16% ± 0.38 (RSD 0.42) and 89.10% ± 0.06 (RSD 0.07) in methanol extract of Curcuma xanthorrhiza, 92.62% ± 0.24 (RSD 0.26) and 100.16% ± 0.07 (RSD 0.07) in Curcuma xanthorrhiza product. Precision test found the RSD value for Pb in the methanol extract and product of Curcuma xanthorrhiza were 0.02 and 0.14 respectively, but the RSD value for Cd were not detected. The linearity test results of Pb and Cd standar solution were 0.9998 and 0.9979. The LOD for Pb and Cd were 0.4 ppm and 0.1 ppm, and the LOQ were 1.3 ppm and 0.5 ppm respectively. Based on the % recovery results, the method of Pb and Cd determination by atomic absorption spectrometry is valid for methanol extract and product of Curcuma xanthorrhiza. The levels of Pb in extract and product of Curcuma xanthorrhiza were 2.10 ± 0.001 mg/kg and 4.34 ± 0.001 mg/kg respectively, but the levels of Cd in both samples did not detected.

Antioxidant Activity of Methanol Extract of the Purun Tikus (Eleocharis dulcis) Leaves Kholifatu Rosyidah; Taufiqur Rohman; Ridhana Fitriani
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 3 (2018): JKPK( Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Purun tikus (Eleocharis dulcis) is a kind of swamp plant, can be found in open water areas, both in swamps and rice fields. Purun tikus is an indicator vegetation of acidic sulfate soil. Chemically, plants that able to adapt to special or extreme conditions, usually produce a compound that are unique and have unique bioactivity as well. This paper reports a phytochemical screening of Purun tikus methanol extract and its antioxidant activity. The results showed that the methanol extract of Purun tikus leaves contained phenolic compounds, flavonoids, tannins and terpenoids. By using DPPH method as an antioxidant test, the methanol extract of purun tikus leaves showed a strong activity, with IC50 value was 58.58 ppm while vitamin C had an IC50 value of 4.50 ppm.

Synthesis of Natural Ni/Zeolite Activated by Acid as Catalyst for Synthesis Biodiesel from Ketapang Seeds Oil Dimas Gilang Ramadhani; Alfiyan Wahyudianto Sarjono; Heri Setyoko; Nur Fitri Fatimah; Nanik Dwi Nurhayati
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 1 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

The purpose of this research are to know the effect of addition Ni on the acidity value of Ni/zeolite catalyst and to know the best combination nickel and Zeolit activated by acid as a catalyst ofthe cracking process during synthesis biodiesel from ketapang seed oil. The Ni/Zeolite catalysts were prepared by immersing the zeolite activated by HCl 4 M into Ni(NO3)2 solution with concentration variation of0%, 5%, and 10%. The catalysts were characterized using XRD, SEM and FTIR. The results showed that the more Ni the more acidity value of the catalyst. The best quality of biodiesel was synthesized using combination catalysts of 5% Ni/Zeolite activated by acid.

Cyclic Voltammetry Study of Mediated Electrochemical Oxidation Using Platinum Wire, Pt/Co(OH)2 and Pt/Co Electrodes In Various Supporting Electrolytes Herlina Herlina; Muhammad Ali Zulfikar; Buchari Buchari
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 2 (2018): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Amoxicillin is one of β-lactam antibiotic in penicillin groups which their presence in surface water and wastewater not only affects water quality but also causes long-term adverse effects on ecosystems and human health due to their resistance to natural biodegradation. The processing of organic waste electrochemically has the advantage of cheap and efficient cost, exhaust gas that does not contain toxic and hazardous materials. We have studied the process of amoxicillin electro-oxidation mediated by a cobalt (III) ion called an electrochemical oxidation process mediated (MEO) in a voltammetry study using a platinum working electrode, Pt/Co(OH)2 and Pt/Co in various supporting electrolytes such as KNO3, NaClO4, Na2SO4 and phosphate buffer solution with concentrations 0.10 M. The results show that the amoxicillin oxidation peaks using the above-mentioned working electrode in various electrolyte solutions are in the potential range of 500-670 mV (Ag/AgCl). The presence of cobalt ions forming complex compounds with amoxicillin causes the oxidation current decreasing that indicates the presence of degradation to amoxicillin.

Strengthening the Competencies of Target Teacher in Assistance of Curriculum 2013 Implementation in Tanggamus Regency - Lampung Province Mohammad Masykuri
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 1 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Development stage of curriculum 2013 has entered the limited-implementation phase to secondary schools. To maintain and improve the sustainability of the understanding and implementation of curriculum 2013, the government has programmed assistance activities for teachers and principals. This programs conducted as reinforcement in understanding the concept of Curriculum 2013 and to help overcome the obstacles that arise during the curriculum implementation. The research objective is to obtain information on the assistance of Curriculum 2013 implementation in accordance with the philosophy, concepts, rules, principles, meaning and procedures included in the elements of the curriculum changes based on Graduate Competence Standard (GCS), Core Competencies (CC) and Standard Competencies (SC) in Tanggamus regency, province of Lampung. The result of the research showed that there are the strengthening competency of target teacher during the mentoring conducted by the core/assistant teacher. The strengthening competencies includes the understanding of: 1) textbooks and teachers' manuals, 2) learning and assessment process, 3) the preparation of lesson plan, 4) learning implementation.

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