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All Journal Jurnal Inovasi Pendidikan Kimia Jurnal Bahan Alam Terbarukan Jurnal Penelitian Pendidikan Sainteknol : Jurnal Sains dan Teknologi JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Indonesian Journal of Chemical Science

Ella Kusumastuti, Ella

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Author-ID : 581083

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Environmental Science Materials Science & Nanotechnology

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Pengaruh Rasio Mol M2O/SiO2 dan M2O/Al2O3 (M: Na dan K) terhadap Karakteristik Geopolimer Abu Layang Batubara Rahman, Ridho Aditya; Kusumastuti, Ella; Widiarti, Nuni
Indonesian Journal of Chemical Science Vol 9 No 1 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i1.29354

Abu layang kelas C telah diteliti mampu menggantikan semen portland karena memiliki kandungan alumino dan silika yang tinggi, sebagai bahan dasar pada beton berbasis geopolimer. Salah satu faktor yang dapat mempengaruhi reaksi geopolimerisasi adalah jenis aktivator yang digunakan yang berperan dalam proses pelarutan alumino dan silika. Semakin banyak kation penyeimbang muatan anion yang terbebaskan, akan meningkatkan kompleksitas geopolimerisasi. Tujuan penelitian ini adalah untuk mengetahui pengaruh rasio mol M2O/SiO2 dan M2O/Al2O3 (M : Na dan K) terhadap kualitas geopolimer yang dihasilkan serta mengetahui pengaruh dua jenis aktivator KOH dan NaOH terhadap kualitas geopolimer berdasarkan uji kuat tekan, analisis fasa mineral XRD dan analisis gugus fungsi FTIR. Sintesis geopolimer dilakukan dengan memvariasi mol aktivator KOH dan NaOH dari variasi massa KOH dan NaOH sebesar (3,5; 4; 4,5; 5 dan 5,5 gram). Hasil penelitian menunjukan bahwa kuat tekan optimum diperoleh pada geopolimer dengan rasio mol K2O/SiO2 sebesar 0,17 dan rasio K2O/Al2O3 sebesar 0,91 pada curing 60 â„ƒ sebesar 34,14 MPa dan rasio mol Na2O/SiO2 0,27 dan rasio Na2O/Al2O3 1,43 memiliki kuat tekan sebesar 31,85 MPa. Hasil suhu curing optimum pada penelitian ini sebesar 60 â„ƒ dimana terjadi penurunan nilai kuat tekan pada perlakuan curing sebesar 75 â„ƒ dan 90 â„ƒ. Karakteristik geopolimer dengan rasio mol M2O/SiO2 dan M2O/Al2O3 (M : K dan Na) terhadap analisis XRD mengakibatkan terbentuknya puncak KAlSiO4 (Ka) dan NaAlSi3O8 (Al) dengan nilai derajat kristalinitas total aktivator K+ 52,14% lebih amorf dari aktivator Na+ 55,32% dan lebih amorf dari prekursor abu layang 58,05%. Analisis gugus fungsi geopolimer dengan FTIR menunjukkan telah terbentuk geopolimer ditandai dengan adanya pita serapan pada 996,01 cm-1dan 987,53 cm-1 mengindikasikan vibrasi ulur asimetri Si-O-Si atau Si-O-Al. Class C fly ash has been studied capable of replacing portland cement because it has a high content of alumino and silica, as a base for geopolymer-based concrete. One of the factors that can influence the geopolymerization reaction is the type of activator used which plays a role in the dissolution process of alumino and silica. The more anion load balancing cations released, will increase the complexity of geopolymerization. The purpose of this study was to determine the effect of mmole ratios M2O/SiO2 and M2O/Al2O3 on the geopolymer quality produced and determine the effect of two types of KOH and NaOH activators on geopolymer quality based on the test compressive strength, XRD mineral phase analysis and FTIR functional group analysis. The geopolymer synthesis was carried out by varying the moles of KOH and NaOH activators from the mass variations of KOH and NaOH for (3.5; 4; 4.5; 5 and 5.5 grams). The results showed that optimum compressive strength was obtained in geopolymers with a mol ratio of K2O/SiO2 of 0.17 and a ratio of K2O/Al2O3 of 0.91 at curing 60 â„ƒ of 34.14 MPa and mol ratio of Na2O/SiO2 0.27 and the ratio of Na2O/Al2O3 1.43 has a compressive strength of 31.85 MPa. The temperature results curing optimumin this study were 60 â„ƒ where the compressive strength decreased in the treatment curing by 75 â„ƒ and 90 â„ƒ. Geopolymer characteristics with mmole ratios M2O/SiO2 and M2O/Al2O3 (M: K and Na) to XRD analysis resulted in the formation of peak KAlSiO4 (Ka) and NaAlSi3O8 (Al) with the degree of crystallinity total K+ 52.14% activator is more amorphous than Na+ activator+ 55.32% and more amorphous than fly ash precursor 58.05%. Analysis of the geopolymer functional group with FTIR showed that geopolymers were formed characterized by the presence of absorption bands at 996.01 cm-1 and 987.53 cm-1 indicating stretching vibrations of Si-O-Si or Si-O-Al asymmetry.

Optimalisasi Konsentrasi Demulsifier pada Proses Demulsifikasi MInyak Mentah dalam Slop Oil Resti, Ade; Kusumastuti, Ella; G, Agnesya Putri; Jumaeri, Jumaeri; Wijayati, Nanik
Indonesian Journal of Chemical Science Vol 9 No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i2.33502

Recovery of the crude oil component in slop oil has the potential to increase the economic value of the slop oil component of the crude oil obtained can be reprocessed, with the demulsification process using two kinds of demulsifiers are Dem-02 and Dem-17. The purpose of this research is to study the variations in demulsifier added to the separated water, and effect of optimum concentration to characterize the crude oil added to viscosity, density, %BS&W, water content, oil content, ash content and metal content (Al, Fe, Ca and Si ) after warming up 24 hours. The results showed the amount of concentration variation of the demulsifier affected the amount of the percentage of water seperation. The more concentrations added the more water water sparation. The optimal demulsifier concentration is at 16.000 ppm. The results of SO-01 and SO-02 slop oil characterization before demulsification each had viscosity of 79.0861 cSt and 408.4904 cSt, density of 0.9842 gr / mL and 0.9806 gr / mL, percentage of BS&W 90% and 80% , ash content 0.9376% and 0.9619%. After demulsification of viscosity 10.2124 cSt and 37.0041, density 0.9052 mg / mL and 0.9119 gr / mL, BS&W percentage 30%, oil content 0.8350% and 1.0505%, water content 19.2% , ash content 1.8869% and 1.8822%. Al, Fe, Ca and Si metal content in slop oil. After demulsification increases with increasing ash content slop from demulsification.

Sintesis Komposit Geopolimer Berbasis Abu Layang-CuO serta aplikasinya sebagai Mortar Antibakteri Mustaqim, Ghozali Akhmad; Kusumastuti, Ella
Indonesian Journal of Chemical Science Vol 9 No 1 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i1.33766

Abu layang sebagai limbah batu bara dapat dimanfaatkan menjadi material fungsional diantaranya geopolimer. Geopolimer sebagai bahan bangunan dapat rusak oleh adanya bakteri. Salah satu cara untuk membuat geopolimer tahan terhadap bakteri adalah dengan menambahkan CuO sebagai agen antibakteri. Tujuan penelitian ini adalah untuk mengetahui pengaruh penambahan CuO terhadap kualitas geopolimer. Sintesis geopolimer dilakukan dengan menambahkan CuO (0;0,25;0,5;1;1,5% b/b abu layang) ke dalam larutan pengaktif (NaOH, H2O dan natrium silikat) pada rasio solid/liquid (S/L) 1,5 dan dilanjutkan dengan penambahkan abu layang. Komposit geopolimer yang dihasilkan dianalisis kuat tekan dan diuji aktivitas antibakterinya menggunakan metode sumuran. Analisis kualitatif juga dilakukan pada geopolimer terbaik yaitu analisis fasa mineral dengan XRD, gugus fungsi dengan FTIR, dan morfologi permukaan dengan SEM. Hasil penelitian menunjukkan bahwa penambahan CuO memberikan peningkatan kuat tekan dan efektivitas antibakteri. Kuat tekan tertinggi diperoleh dari komposit geopolimer-CuO 1% sebesar 37,02 MPa. Efektivitas antibakteri terbaik untuk bakteri Bacillus subtillis (Gram positif) pada penambahan CuO 1% dengan zona hambat 11,75 mm dan untuk bakteri Escherichia coli (Gram negatif) pada penambahan CuO 1,5% dengan zona hambat 8,25 mm. Sedangkan hasil menunjukkan bentuk geopolimer pada fasa amorf dan puncak CuO terlihat dengan intensitas sangat kecil. Hasil analisis gugus fungsi dan morfologi pada komposit geopolimer-CuO tidak menunjukkan perubahan secara signifikan.

Steel Corrosion Protection with Water-Soluble Chitosan Inhibitor in 0,1 M HCl Solution Media Fitria, Reffy Ika; Mahatmanti, F. Widhi; Kurniawan, Cepi; Kusumastuti, Ella
Indonesian Journal of Chemical Science Vol 10 No 1 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v10i1.46015

Corrosion in steel can reduce the steel quality, so it is necessary to have a corrosion inhibitor. Water-soluble chitosan can be an alternative as corrosion inhibitors. This study aims to determine the efficiency of water-soluble chitosan inhibitor (WSC) added to the corrosive HCl solution in the steel protection process, and to determine the maximum concentration of WSC as a steel corrosion protector. Water-soluble chitosan (WSC) has been prepared from chitosan by reacting with H2O2. The products obtained were used as corrosion protection inhibitors in steel in a corrosive solution of 0,1 M HCl. Chitosan and WSC were characterized by their physical properties and functional groups using FTIR and physical tests for yield, viscosity, molecular weight (BM),% DD, solubility, and water content. . The effectiveness of WSC in corrosion protection of steel in corrosive 0,1 M HCl solution was studied by weight loss and potentiodynamic polarization methods. The results obtained by chitosan were a viscosity of 1,4969 cP, BM 8,38 x 104,% DD 77,17%, 10,25% moisture content and 33,48% solubility. Water-soluble chitosan obtained yield 86.325%, viscosity 0,296 cP, BM 6,9 x 103,% DD 79,95%, water content 27,07% and 72,77% solubility. Inhibitor efficiency was found in WSC 2000 ppm and 0,1 M HCl, which was 68,15% EI (weight loss), while the potentiodynamic polarization method obtained an EI of 87,5%.

Iron Extraction from Coal Fly Ash Using HCl Solution Setyo, Slamet Budi; Sulistyaningsih, Triastuti; Prasetya, Agung Tri; Kusumastuti, Ella
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.v10i2.47881

About 780 million tonnes of fly ash are produced annually worldwide. The use of fly ash is still minimal, causing fly ash piles to increase. Based on this, a study was conducted on the extraction of iron from coal fly ash using HCl as a solvent. This study aims to determine the Fe content in fly ash extracted using HCl with variations in HCl concentration and extraction time. This research begins with the preparation of fly ash samples using an oven. Fly ash that has been prepared and extracted using HCl added with MIBK and EDTA was then characterized using XRF, FTIR and AAS. The results showed that the highest Fe content (11.48%) was obtained from the extraction using 9N HCl for 1 minute. The greater the concentration of HCl and the faster the extraction time, the more Fe extracted.

Method Validation on Functional Groups Analysis of Geopolymer with Polyvinyl Chloride (PVC) as Additive Using Fourier Transform Infrared (FT-IR) Sulistyani, Martin; Kusumastuti, Ella; Huda, Nuril; Mukhayani, Feri
Indonesian Journal of Chemical Science Vol 10 No 3 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v10i3.50419

Fourier transform infrared (FT-IR) transmission spectroscopy is a method of analyzing functional groups on a compound that is simple, economical, and non-destructive. Geopolymers with PVC synthetic fiber additives are considered to have complete functional groups representing organic and inorganic compounds. The purpose of this study was to validate the functional group analysis method on geopolymers using FT-IR. To analyze the typical peaks of the spectra of the geopolymer compound, KBr pellets were prepared with 7 sample variations (0.25 mg; 0.50 mg; 0.75 mg; 1.00 mg; 1.25 mg; 1.50 mg; and 1. ,75 mg) on the addition of KBr up to 16 mg interday and intraday for 3 consecutive days. The FT-IR spectroscopy method was validated with the parameters of linearity, detection limit (LoD), quantization limit (LoQ), accuracy, and precision. The analytical method applied is linear with the measured sample concentration range. The absorbance at wave number 986 cm-1 as the Si-O-Si absorption peak was chosen for method validation. From the results of the analysis, the regression coefficient (R2) is 0.9938 for geopolymers and 0.9923 for geopolymers with PVC as an additive. The analytical method that has been carried out shows that FT-IR spectroscopy is precise and accurate for measuring the spectrum of geopolymers and geopolymers with PVC additives.

Acivated Activated Carbon from Kepok Banana Peel (Musa padisiaca L.) as Methyl Orange and Methyl Violet Adsorbent in Aqueous Solution Anindya, Bella Diska; Mahatmanti, F. Widhi; Kusumastuti, Ella; Wahyuni, Sri
Indonesian Journal of Chemical Science Vol 10 No 3 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v10i3.51178

Kepok banana peel is used as raw material for activated carbon for adsorption of methyl orange and methyl violet because it has a high lignocellulose content of 90.7%. Methyl orange and methyl violet are azo dyes that have a benzene structure that is very difficult to degrade. This study aims to determine the characteristics of activated carbon from kepok banana peel waste and to determine the optimum conditions for adsorption of methyl orange and methyl by activated carbon which include pH, contact time, and initial concentration of dye. This study includes the preparation of adsorbents (activated carbon from banana peels activated ZnCl2) and adsorption optimization includes optimization of pH, contact time, and concentrations of methyl orange and methyl violet in solution. The results showed that the characterization of activated carbon using an infrared spectrophotometer contained the presence of O-H, C=O, C-H, and C-O groups on activated carbon without activation, activated ZnCl2, and after adsorption was used. Characterization using a surface area analyzer with the BET method showed that activated carbon without activation had a surface area of 2.278 m2/g and a pore diameter of 2.0548 nm which was included in the mesoporous category. While activated carbon activated ZnCl2 has a surface area of 106.287 m2/g and a pore diameter of 1.5111 nm which is included in the category of micropores. The optimum conditions for methyl orange adsorption were obtained at pH 3, a contact time of 80 minutes, and a concentration of 0.3 mmol/L, while the optimum conditions for methyl violet adsorption were obtained at pH 5, a contact time of 80 minutes, and a concentration of 0.4 mmol/L.

REAKSI ESTERIFIKASI ?-PINENA MENJADI ?-TERPENIL ASETAT DENGAN KATALIS ZEOLIT ALAM Wijayati, Nanik; Purwodiningsih, Ristia; Widarti, Nuni; Kusumastuti, Ella
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.v15i2.12406

Turpentine is one of the oil obtained from pine tree with composition of 82% ?- pinene. Turpentin oil has a high sales value is to make the esterification reaction ?-pinene to get ?-terpinyl. Usually esterification ?-pinene is carried out with homogeneous catalysts are corrosive and unreusable. The purpose of the research are to know the optimum reaction time(2, 3, 4 jam), optimum reaction temperature (30, 40, 60ºC)and optimum mol ratio of reactants (1:5, 1:15, 1:20) between ?-pinene and acetic anhydride for esterification ?-pinene to ?-terpinyl acetate using natural zeolite. Characterization of catalyst involve X- ray Diffraction, spectroscopy IR and Scanning Electron Microscopy. Product of esterification reaction analyzed using spectroscopy IR, gas chromatography, and gas chromatography-mass spectroscopy. Result of the analysis using spectrocopy IR show absorption of C-H at 2923 cm-1, C=O at 1725 cm-1, C=C at 1617 cm-1 and C-O at 1254 cm-1. The reaction time effect the conversion of ?-pinena while reaction temperature and mol ratio of reactants effect on the increased levels of reaction products produced. The optimum conditions for esterification reaction ?-pinene to ?-terpinyl acetate is at temperature of 40ºC during 3 hours with mol ratio of reactants between ?-pinene and acetic anhydride is 1:15 to produce ?-terpenyl acetate amewweounted to 21,40%. Keywords: ?-pinena, esterification, ?-terpinyl acetate

PENGEMBANGAN SOFTSKILL DAN HASIL BELAJAR KIMIA DASAR DENGAN MENGGUNAKAN MODEL PEMBELAJARAN 5-E (ENGAGEMENT, EXPLORATION, EXPLANATION, ELABORATION, EVALUATION) WK,, Samuel Budi; Kusumastuti, Ella; Widiarti, Nuni
Jurnal Penelitian Pendidikan Vol 33, No 2 (2016): October 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpp.v33i2.9103

Tujuan dari penelitian ini untuk mengetahui peningkatan hasil belajar kimia dan Soft skill mahasiswa dengan menggunakan strategi pembelajaran 5-E((Engagement, Exploration, Explanation, Elaboration, Evaluation). Penelitian ini merupakan penelitian pengembangan yang terdiri dari tiga tahap. Tiap tahap terdiri dari perencanaan, pelaksanaan, pengamatan, dan refleksi. Subyek penelitian ini adalah mahasiswa Jurusan Pendidikan Kimia UNNES. Fokus yang diteliti dalam penelitian ini adalah hasil belajar dan pengembangan soft skill mahasiswa. Data yang diperoleh kemudian dianalisis dengan menggunakan metode deskriptif untuk mengetahui peningkatan hasil belajar dan pengembangan soft skill mahasiswa. Hasil belajar mahasiswa jurusan Kimia UNNES meningkat. Rerata hasil belajar tahap I adalah 64,62, tahap II adalah 75,85, dan pada tahap III adalah 79,77. Hasil rerata soft skill mahasiswa yang memenuhi kriteria tinggi dan sangat tinggi meningkat dari tahap 1 (77%), tahap 2 (80%) dan tahap 3 (92%).

Membran Padat Kitosan-Silika-PEG sebagai Membran Pemisah Ion Logam Bivalen dan Rhodamin B pada Limbah Cair Industri Tekstil Widhi Mahatmanti; Ella Kusumastuti; Wara Dyah Pita Rengga
JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Vol 3, No 2 (2019)
Publisher : State University of Malang or Universitas Negeri Malang (UM)

Penggunaan membran padat kitosan-silika-polietilen glikol (Ch/Si/P) sebagai membran pemisah telah dipelajari. Dalam penelitian ini, membran padat kitosan-silika-polietilen glikol digunakan sebagai membran pemisah untuk ion logam bivalen, termasuk Pb(II), Cu(II), Cd II), dan zat warna Rhodamin B dalam limbah cair tekstil. Membran padat Ch/Si/P dibuat dengan mencampurkan kitosan, silika (dengan natrium silikat yang diisolasi dari abu sekam padi sebagai sumber silika) dan polietilen glikol dengan perbandingan 1: 0,8: 0,5 (b/b). Uji kinerja membran padat dilakukan menggunakan metode dead-end. Uji kinerja menunjukkan bahwa selektivitas membran padat Ch/Si/P meningkat dari Cu(II)> Cd(II)> Pb(II)> Rhodamine B. Membran komersial menunjukkan, selektivitas mengikuti urutan Rhodamine B> Pb(II)> Cd(II)> Cu(II). Hasil penelitian menunjukkan bahwa membran padat Ch/Si/P lebih baik sebagai membran pemisah ion logam bivalen dibandingkan membran komersial. Membran komersial lebih baik sebagai membran pemisah Rhodamine B dibandingkan membran padat Ch/Si/P karena memiliki struktur berserat dan berpori.

Co-Authors - Jumaeri A.A. Ketut Agung Cahyawan W Agung Tri Prasetya Amanda Shinta Maylani, Amanda Shinta Anindya, Bella Diska Arum Septiosari, Arum Cepi Kurniawan Darojah, Lia Inarotut Darojah, Lia Inarotut Dina Amalina, Dina Eko Budi Susatyo F Widhi Mahatmanti Farida Nur Aziza, Farida Nur Fitria, Reffy Ika G, Agnesya Putri Ghozali Akhmad Mustaqim, Ghozali Akhmad Hakim, Yanuar Hakim, Yanuar Hisan, Aisyah Khoirotun Hisan, Aisyah Khoirotun Isnaeni, Diana Isnaeni, Diana Kasmui -, Kasmui Latifah Latifah Luluatul Maghfiroh, Luluatul Machiril, Dhonirul Machiril, Dhonirul Moh. Syukur, Moh. Mukhayani, Feri Nanik Wijayati Nuni Widiarti Nurbaeti, Lutfi Nurbaeti, Lutfi Nurdiani, Arida Nuril Huda Persada, Mega Bunga Persada, Mega Bunga Pratiwi Dwi Jananti, Pratiwi Dwi PUJI LESTARI Purwodiningsih, Ristia Rahman, Ridho Aditya Ratri, Irwandari Rahma Nur Ratri, Irwandari Rahma Nur Resti, Ade Rizky Nurarief Anwar, Rizky Nurarief Safitri, Tsania Safitri, Tsania Samuel Budi WK,, Samuel Budi Setyawan, Mohammad Nurul Setyawan, Mohammad Nurul Setyo, Slamet Budi Sofia, Aya Sofia, Aya Sri Roikah, Sri Sri Wahyuni SRI WARDANI Sulistyani, Martin Tri Puspitarini, Tri Triastuti Sulistyaningsih Ulil Albab Chandra Trapsila, Ulil Albab Chandra Umayah, Isponi Umayah, Isponi Wara Dyah Pita Rengga Warlan Sugiyo Widarti, Nuni Widhi Mahatmanti Widhi Mahatmanti Winarni Pratjojo, Winarni Wisnu Sunarto Wulandari, Ari Vitri Wulandari, Ari Vitri Yhuni Karlina, Yhuni Zulichatun, Siti - Zulichatun, Siti -

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