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All Journal Reaktor International Journal of Renewable Energy Development JURNAL KIMIA SAINS DAN APLIKASI Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Indonesian Journal of Mathematics and Natural Sciences Jurnal Inovasi Pendidikan Kimia Sainteknol : Jurnal Sains dan Teknologi Jurnal Zeolit Indonesia Phenomenon : Jurnal Pendidikan MIPA Chemistry in Education Indonesian Journal of Chemical Science Indonesian Journal of Physics and Nuclear Applications Jurnal Penelitian Pendidikan IPA (JPPIPA) ALCHEMY Jurnal Penelitian Kimia IQRO: Journal of Islamic Education Journal of Innovative Science Education International Journal of Active Learning Jurnal Litbang Provinsi Jawa Tengah

- Jumaeri

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Author-ID : 293528

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences

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Modification of Magnesium Oxide from Bittern Waste with Strontium Oxide for Palm Oil Transesterification Process Qoyyima, Diana; Jumaeri, Jumaeri
Indonesian Journal of Chemical Science Vol 10 No 2 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v10i2.50033

Bittern has a high magnesium content, so that it can be used as a catalyst in the production of biodiesel through the transesterification process. MgO catalyst has a relatively low basicity, so it is necessary to add metal oxides such as SrO. This study aims to determine the characteristics and catalytic effectiveness of the SrO/MgO catalyst in the transesterification process of palm oil using GC and GCMS tests. Modification of SrO on the MgO catalyst was carried out using the impregnation method with a ratio of 1:3. The presence of SrO diffraction peaks on XRD analysis showed that SrO agglomerated on the MgO surface, this can be attributed to the morphology of the spheres which are homogeneously agglomerated. The result of basicity analysis shows that the addition of SrO can increase the number of moles of base of MgO. In the palm oil transesterification process using an SrO/MgO catalyst, the methyl ester conversion increased by 47.17% at the optimal reaction time of 2 hours, while the MgO catalyst only resulted in a conversion of 2.35%. Based on the results of the study, it was found that the addition of SrO could increase the catalytic effectiveness of MgO.

The Validity of HOTS Assessment Instrument to Measure Ability of Problem-Solving on Thermochemistry Materials Inayati, Ismi; Susilaningsih, Endang; Jumaeri, Jumaeri
International Journal of Active Learning Vol 7, No 1 (2022): April 2022
Publisher : International Journal of Active Learning

Show Abstract | Download Original | Original Source | Check in Google Scholar

This research is motivated by the lack of variety of HOTS questions to measure ability of problem-solving on thermochemistry materials. The objective of this research is to develop a HOTS assessment instrument to measure valid problem-solving abilities on thermochemical materials. The research method used is RD with a 4D model adapted from Thiagarajan that is converted into 3D, that are define, design, and develope. The subjects of this research were 77 students of class XI MIPA SMA Negeri 1 Pemalang. The data collection sources and methods include: interviews, questionnaires, and tests. The analysis results of the content validity of the instrument obtained that the Aiken'S coefficient in all aspects measured was above 0.75. This shows that the HOTS assessment instrument is very valid. The validity of the construct is seen from the value raw variance explained by measures 48.6% has very good criteria so that the question items are valid. The analysis results of the quality of the HOTS questions to measure problem-solving abilities are seen in terms of the validity of the items, it is known that there are 16 items that are said to be valid and 4 items are said to be invalid because they do not meet the requirements outfit MNSQ, Outfit ZSTD, and Point Measure Correlation.

INOVASI PEMURNIAN GARAM (NATRIUM KLORIDA) MENGGUNAKAN ZEOLIT ALAM SEBAGAI PENGIKAT IMPURITAS DALAM PROSE KRISTALISASI Jumaeri, Jumaeri; Sulistyaningsih, Triastuti; Sunarto, Wisnu
Sainteknol : Jurnal Sains dan Teknologi Vol 15, No 2 (2017): December 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v15i2.12403

Garam merupakan salah satu komuditas strategis yang diprioritaskan untuk dikembangkan oleh Kementrian Perindustrian. Kebutuhan garam berkualitas tinggi, utamanya garam industri, masih diimpor dari luar negeri. Penelitian inovasi proses pemurnian garam menggunakan filter zeolit alam sebagai bahan pengikat impuritas dalam proses kristalisasi telah dilakukan. Penelitian bertujuan untuk mengetahui efektifitas dan kondisi optimal proses pemurnian garam (natrium klorida) menggunakan zeolit alam dalam proses kristalisasi dan model proses pembuatan uapan air laut. Penelitian ini dimulai dengan pengambilan sampel garam krosok dan karakterisasinya. Sampel garam krosok selanjutnya dimurnikan dengan menggunakan zeolit alam sebagai pengikat impuritas dalam proses kristalisasi. Efektifitas proses pemurnian ditetukan berdasarkan kualitas garam hasil pemurnian yang diperoleh. Kualitas produk garam hasil pemurnian ditentukan berdasarkan standar kualitas garam baku sesuai SNI Garam 2000, yang meliputi kadar NaCl, air, logam berat, Ca, Mg dan sifat fisik garam (warna, rasa dan bentuk kristal). Kemurnian produk garam juga diuji menggunakan XRD dan hasilnya dibadingkan dengan NaCl standar. Hasil penelitian menunjukkan bahwa garam krosok dengan kadar NaCl 82,37% setelah proses pemurnian kadar NaCl meningkat menjadi 92,64, 92,49 dan 91,80% masing-masing untuk kepekatan awal larutan garam 17, 15 dan 12o Be. Kadar air garam hasil kristalisisasi untuk ketiga larutan garam adalah 1,25, 1,52 dan 1,68%. Hasil penelitian ini menunjukkan bahwa zeolit alam dapat digunakan secara efektif dalam pemurnian garam dapur melalui proses kristalisasi. Aktivasi zeolit dengan larutan HCl 0,1 M dapat meningkatkan kualitas garam hasil rekristalisasi. Garam hasil kristalisasi mempunyai kadar NaCl tertinggi (98,73%) diperoleh dengan menggunakan zeolit lolos ayakan 10/20 mesh yang teraktivasi HCl 0,1 M

Preparation of Magnesium Oxide Nanoparticles from a Sea Water Bittern as an Antibacterial Agent Against Escherichia coli Ningrum, Ananda Nurmalia Kusuma; Jumaeri, Jumaeri
Indonesian Journal of Chemical Science Vol 11 No 1 (2022)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v10i3.51041

Bittern is a by-product of the manufacture of salt which has a high MgCl2 content. Bittern can produce Mg(OH)2 which is one of the important precursors of MgO. MgO compounds can be used as an antibacterial against E. coli that contaminates food. This research aims to synthesize MgO nanoparticles as well as antibacterial testing against E.coli. Synthesis was performed using the wet precipitation method with bittern reaction and technical NaOH with volume ratio 1: 1 which was then calcined at 5000C, 6000C, and 7000C. Characteristic tests using XRD, FT-IR, and SEM and antibacterial activity testing using disc diffusion method with concentrations of 10 mg/mL, 20 mg/mL, and 30 mg/mL. Inhibition is measured based on the size of the diameter of the bacterial growth inhibition area. Based on the results of the XRD test showed the result of pure MgO with a crystalline size of 6.3 nm; 7.2 nm; and 15.8 nm at each calcination temperature, the FT-IR test produced an absorption at a wave <450 cm-1 indicating the presence of MgO clusters and the SEM test produced a nano-structure that was almost round, dense as a cavity in the grains. The results of testing the antibacterial activity of MgO nanoparticles showed inhibitory activity with a diameter range between 5 mm - 8 mm which was interpreted in the medium category. The best inhibition value is 5000C calcination at a concentration of 30 mg/ml of 7.87 mm.

Separation of Cerium, Neodymium, and Lanthanum from Rare Metal Concentrates by Calcining and Leaching Using Hydrochloric Acid Alfawwazi, Abdul Fattah; Setyadji, Much.; Jumaeri, Jumaeri
Indonesian Journal of Chemical Science Vol 11 No 1 (2022)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v11i1.53964

The separation of Ce, La, and Nd elements from rare earth metal (REOH) concentrates from monazite sand processing needs to be done because the uses of La and Nd in the industry are very large. This research was conducted to determine the optimization of leaching in the separation of Ce, La, and Nd. The method used to separate the elements Ce, La, and Nd from the rare earth metal concentrate is through calcination at a temperature of 600°, 800°, 1000°C for 2 hours and without calcination, followed by a leaching process using 0.9 M HCl solvent at a temperature of 75°C. Variations made are the ratio of solid and liquid ratio and variations in time (5, 10, 15, 20, and 25 minutes), and the stirring speed is fixed at 150 rpm. From the results of FT-IR and XRD analysis, it is known that calcination can convert REOH concentrate into REO. Residual analysis of leaching results using XRF showed that the increase in calcination temperature with a solid and liquid ratio and leaching time could affect the leaching efficiency results. The highest leaching efficiency for the element La was obtained at a calcination temperature of 1000°C with a time of 10 minutes, which was 73.20%. Meanwhile, the optimum condition for the best leaching process for Nd is at a calcination temperature of 1000°C with a contact time of 5 minutes with a leaching efficiency of 49.68%.

KARAKTERISASI ABU LAYANG INDUSTRI BAN DAN PEMANFAATANNYA UNTUK PEMBUATAN BATAKO Jumaeri Jumaeri; Woro Sumarni; Latifah Latifah
JURNAL LITBANG PROVINSI JAWA TENGAH Vol 1 No 1 (2003): Jurnal Litbang Provinsi Jawa Tengah
Publisher : Badan Perencanaan Pembangunan, Penelitian dan Pengembangan Daerah Provinsi Jawa Tengah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36762/jurnaljateng.v1i1.22

The use of coal asenergy sources at boiller engine of tire industry can causes fly accumulation. The objective of the research is to study feasibility of fly ash waste from tire industry for concrete brick production, by involve the fly ash/cement, water/(fly ash + cement+ sand) ratio and lime addition. The fly ash characterization carried out by gravimetri methode analysis. The test materials of brick were made by mixed fly ash, cement, sand, lime and water in given weight ratio. The mixture was stirred untuil was found the workable paste. The casting of test material carried out the cubic 7 x 7 x 7 cm in size. The compressive strength was test carried out after 28 days curing. The result show that the major enstituent of fly ash is fol• lowed : Si02 63,01 %, Al203 9,27 %, Fe203 6,31 %, CaO 5, 19 % and Mg 0,05 %. The com• pressive strength of brick to decrease by increasement of the used fly ash. At the ratio of fly ash/cement 20 : 80 and 30 : 70, 600 g sand, the compressive strength of brick is 118, l 5 and 108,08 kg/cm2 respectively. The ratio ofwater/(fly ash+ cement+ sand) influence the compressive strength on concrete brick. The compressive strength reach the maximum value at given point and than to gradually decrease. At the composition of fly/cement= 30: 70 and 20: 80 the compressive strength is maximum at the ratio of water/(fly ash+ cement+ sand) 0, 10 and between 0, 10 - 0, 15 are respestively. The addition of lime at mixture of fly ash, cement and sand is trend to decrease the compressive strength. Addition, in concrete brick production, the addition of fly ash it is preferable if not more than 25 - 30 % of the used cement and mechanically compression.

Effect of pH on Adsorption of Cr(III) and Cr(VI) by zeolite A (from Fly Ash) Modified Surfactant HDTMA Jumaeri Jumaeri; Juari Santosa; Sutarno Sutarno; Ella Kusumastuti
Indonesian Journal of Physics and Nuclear Applications Vol 1 No 3 (2016)
Publisher : Fakultas Sains dan Matematika Universitas Kristen Satya Wacana

Adsorption of Cr(III) and Cr(VI) in aqueous solution by the zeolite A from coal fly ash modified hexadecyltrimethylammonium bromide (HDTMAB) at various pH conditions has been carried out. Zeolite A was synthesized from fly ash through modified alkaline fusion hydrothermal process in a reactor stainless steel. The surface modification was performed using cationic surfactant HDTMAB twice as much as the cationic exchange capacity of the elite A resulted. The surfactant modified zeolite A was then applied to adsorption the metal ion chromium as Cr(III) and Cr(VI) in aqueous solution. The results showed that the acidity (pH) of adsorption conditions, affect the ability of adsorption surfactant modified zeolite A (SMZA) to Cr(III) and Cr(VI) in aqueous solution. The optimum pH conditions for the adsorption of Cr(III) and Cr(VI) on SMZA exist at pH 6. Surfactant modified zeolite A capable to adsorb either cation Cr(III) or anion Cr(VI). Adsorption of SMZA on Cr(III) increased from 36.30% to 97.04% with the increase the acidity of pH of 2 to 6. Adsorption SMZA to Cr(VI) is lower than the adsorption of the Cr3+, adsorption increasing from 19.63 to 64.07% with increase pH of 2 to 6

ANALISIS KOMPOSISI UNSUR, DENSITAS, MAKROSTRUKTUR, DAN FASA PADUAN U-6Zr-xNb PASCA UJI KOROSI Masrukan Masrukan; Deni Mustika; Deninta Andara Perdana; Jumaeri Jumaeri
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 26, No 3 (2020): Oktober, 2020
Publisher : website

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2020.26.3.6051

ANALISIS KOMPOSISI UNSUR, DENSITAS, MAKROSTRUKTUR, DAN FASA PADUAN U-6Zr-xNb PASCA UJI KOROSI. Penelitian mengenai komposisi unsur, densitas, makrostruktur, dan fasa paduan U-6Zr-xNb pasca uji korosi telah dilakukan. Analisis komposisi paduan dilakukan sebelum uji korosi yang meliputi uji kadar uranium dengan titrasi potensiometri, uji kadar pengotor dengan Atomic Absorption Spectroscopy (AAS) serta uji kadar Zr dan Nb dengan X-Ray Fluorescence (XRF). Analisis komposisi paduan bertujuan untuk memastikan bahwa bahan bakar U-6Zr-xNb memenuhi syarat kualitas bahan bakar nuklir. Uji densitas dilakukan untuk menjadi salah satu parameter dalam menghitung laju korosi, sedangkan pengamatan makrostruktur dan fasa paduan dilakukan untuk mengetahui kerusakan atau produk korosi serta lapisan/fasa yang terbentuk setelah terjadi korosi. Hasil uji komposisi paduan U-6Zr-xNb dengan XRF maupun titrasi potensiometri menunjukkan bahwa kadar uranium sudah mendekati kadar yang syaratkan, sedangkan untuk uji pengotor dengan AAS menunjukkan adanya kadar pengotor melebihi yang disyaratkan untuk bahan bakar nuklir antara lain Al, Fe dan Si. Berdasarkan hasil tersebut, bahan bakar U-6Zr-xNb masih memenuhi persyaratan. Dilihat dari sifat neutroniknya, unsur Al, Fe dan Si memiliki tampang serapan neutron yang rendah. Hasil uji densitas sampel U-6Zr, U-6Zr-1Nb, U-6Zr-4Nb, dan U-6Zr-7Nb masing-masing sebesar 16,9798 g/mL, 16,6115 g/mL, 15,594 g/mL, dan 15,3564 g/mL. Pengamatan makrostruktur paduan pasca korosi menunjukkan adanya bercak hitam yang merupakan hasil oksidasi U (IV) menjadi U (VI). Paduan U-6Zr-xNb mengalami korosi paling besar pada media air bebas mineral. Kerusakan pada permukaan paduan semakin menurun seiring bertambahnya presentase berat Nb dalam paduan. Hasil karakterisasi paduan pasca korosi menggunakan XRD menunjukkan bahwa sampel U-6Zr dan U-6Zr-1Nb terbentuk fasa α, sedangkan untuk sampel U-6Zr-4Nb dan U-6Zr-7Nb terbentuk fasa γ. Lapisan oksida protektif Nb2O5 yang terbentuk sangat kecil, sehingga tidak terdeteksi oleh XRD.Kata kunci: Paduan UZrNb, komposisi, pengotor, korosi, densitas, makrostruktur, pembentukan fasa.

Preparasi dan karakterisasi zeolit dari abu laying batu bara secara alkali hidrotermal Jumaeri Jumaeri; w. Astuti; w. T.P. Lestari
Reaktor Volume 11, Nomor 1, Juni 2007
Publisher : Dept. of Chemical Engineering, Diponegoro University

Preparasi zeolit dari abu laying batu bara PLTU Suralaya secara alkali hidrotermal telah dilakukan. Preparasi dilakukan terhadap abu laying yang telah direfluks dengan HCl 1M dan tanpa refluks. Larutan NaOH dengan konsentrasi tertentu (1, 2 dan 3 M) dicampur dengan abu laying batu bara dengan rasio 10 ml larutan tiap 1 gram abu laying, ke dalam tabung Teflon 100 ml dalam suatu auto clave stainless-steel. Autoclave kemudian dipanaskan pada temperatur 80-16 0C selama 3 hari. Zeolit sintesis yang dihasilkan selanjutnya diuji secara kualitatif dengan menggunakan spektroskopi inframerah., dan Difraksi Sinar-X. Hasil penelitian menunjukkan bahwa aktivasi abu laying dengan proses alkali hidrotermal dapat material yang mempunyai struktur mirip zeolit (zeolit-like). Produk hidrotermal terdiri dari campuran zeolit ( Zeolit P, Zeolit Y) serta Kristal sodalit dan mulit. Pada temperatur 160 0C, diperoleh zeolit dengan kristalinitas lebih tinggi daripada 100 0C, baik melalui refluks atau tanpa refluks. Karakteristik zeolit yang terbentuk sangat ditentukan oleh kondisi proses, yang meliputi konsentrasi NaOH, waktu dan temperatur.Kata kunci : abu layang batu bara, alkali hidrotermal, preparasi, karakterisasi, zeolit

THE EFFECT OF NaOH CONCENTRATION AND TEMPERATURE ON ZEOLITE SYNTHETIS FROM FLY ASH BY HIDROTHERMAL ALKALI Jumaeri Jumaeri; Sutarno Sutarno; Eko Sri Kunarti; Sri Juari Santosa
Jurnal Zeolit Indonesia Vol. 8 No. 1 (2009)
Publisher : Jurnal Zeolit Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Zeolite synthesis from coal fly ash PLTU Tanjung Jati Japara was conducted by hydrothermal alkali. Preparation was done on fly-ash that has been refluxed with 1M of HCl and without refluxed. NaOH with certain concentration (2, 3, and 4M) was mixed with coal fly-ash by ratio 10 ml each 1 gram of fly ash into Teflon tube 100 ml at autoclave stainless-steel. Then, autoclave was heated on the oven at temperature of 120-1600C. Synthetic zeolite ouput was qualitative tested by using infrared spectroscopy, X-Ray diffraction, and SEM. The result showed that NaOH concentration, temperature, and hydrothermal alkali period of coal fly ash was affecting characterization of zeolite ouput. The temperature which use for optimally hydrothermal processes exist on range 140 "“160oC. The increase of temperature causes improving crystallization of zeolite products. Hydrothermal synthetic product from fly ash is alumina-silica compound which are a mixture of some crystals such as P zeolite, Y zeolite, sodalite, mullite, and quartz.

Co-Authors Afwah, Apriliani Arifatul Agung Tri Prasetya Agung Tri Prasetya Agung Tri Prasetya Akhsanun Nadiyya Alfawwazi, Abdul Fattah Alighiri, Dante Amique, Iqnatu Nazila Ani Rusilowati Anita Rahayu Annisa, Riska Nurfirda Antonius Tri Widodo Arum Mawar Wati Budhy Kurniawan Cepi Kurniawan Darmadinata, Mariyanti Darmadinata, Mariyanti Darojah, Lia Inarotut Darojah, Lia Inarotut Deni Mustika Deninta Andara Perdana E Kusumastuti, E Edy Cahyono Eko Sri Kunarti Elfrida Ratnawati Ella Kusumastuti Ella Kusumastuti, Ella Endang Susilaningsih Endang Susilaningsih Ersanghono Kusumo, Ersanghono Etty Soesilowati Evalisa Apriliani, Evalisa F Widhi Mahatmanti G, Agnesya Putri Habibah, Febrina Nur Haditya, Ervan Bagus Hakim, Yanuar Hakim, Yanuar Harjito - Harjono Harjono Hastuti, Vidya Dwi Hastuti, Vidya Dwi Holyness Nurdin Singadimedja Isbullah, Isbullah Ismi Inayati, Ismi Istiana, shofa Jayanti, Yeni Fitriana Jayanti, Yeni Fitriana Juari Santosa Kamila, Naila Faza Kasmadi Imam Supardi Khafidhotun Naimah Khasanah, Ni'matul Khasanah, Nimatul Khavilla, Vidya Putri Latifah Latifah Latifah Latifah Lubis, Syafrina Yani Machiril, Dhonirul Machiril, Dhonirul Masrukan Masrukan Megasari, Nofita Megasari, Nofita Mohammad Alauhdin, Mohammad Munazat, Dicky Mutiara Dewi Rukmana, Mutiara Dewi Naila Faza Kamila Nanik Wijayati Ningrum, Ananda Nurmalia Kusuma Ningrum, Lis Setiyo Ningrum, Lis Setiyo Nino Rinaldi nurfainzani, pratiwi nurfainzani, pratiwi Nurhidayah Nurhidayah Patricia, Amelinda Diana Patricia, Amelinda Diana Pratiwi Dwi Jananti, Pratiwi Dwi Putri, Witha Berlian Qoyyima, Diana Rahayu, Endah Fitriani Rahmawati, Septiani Yuni Resti, Ade Riyanto, Ari Fajar Rusiyanto Rusiyanto, Rusiyanto S Mursiti Saadah, Nelis Savitri Savitri, Savitri Setyadji, Much. Sigit Priatmoko Sri Haryani Sri Juari Santosa Sri Juari Santosa Sri Kadarwati Sri Wahyuni SRI WARDANI Sucipto, Lukman Sulistyani, Martin Sulistyaningsih, Triastuti Sunarto, Wisnu Sutarno Sutarno Sutarno Sutarno Triastuti Sulistyaningsih Tunjungsari, Faricha Tunnisa, Tasqia Tunnisa, Tasqia Ulya, Isnaeni Nurul unnes, krisnawati kimia unnes, krisnawati kimia Uswatun Hasanah VH Putranto, VH w. Astuti w. T.P. Lestari Wahyu Rahmawati, Aliftia Wahyu Rahmawati, Aliftia Wahyuni, Promes Sari Wardani, Deta Sri Warlan Sugiyo Wawan Rustyawan Wawan Wawan Widiya Aprilianti Winning Kusuma, Alberto Krishna Ksatria Winning Kusuma, Alberto Krishna Ksatria Wisnu Sunarto Woro Sumarni Zulichatun, Siti - Zulichatun, Siti -

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