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All Journal JURNAL KIMIA SAINS DAN APLIKASI Abdimas Jurnal Inovasi Pendidikan Kimia Sainteknol : Jurnal Sains dan Teknologi Indonesian Journal of Chemical Science Indonesian Journal of Chemistry Journal of Innovative Science Education JKPK (Jurnal Kimia dan Pendidikan Kimia) International Journal of Active Learning Al Maktabah Jurnal kajian Ilmu dan Perpustakaan Indonesian Journal of Chemistry and Environment Jurnal Puruhita Proceeding of International Conference on Science, Education, and Technology Bulletin of Chemical Reaction Engineering & Catalysis Indonesian Journal of Chemical Science Indonesian Journal of Conservation Sainteknol : Jurnal Sains dan Teknologi

Triastuti Sulistyaningsih

Unknown Affiliation

Author-ID : 391343

Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Library & Information Science Materials Science & Nanotechnology Physics Social Sciences Other

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Conceptual Understanding Analysis Through Two-Tier Model Diagnostic Tests on Acid-Base Materials Sintia Ayu Dewi; Endang Susilaningsih; Triastuti Sulistyaningsih
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

This research aims to organize instrument of computer-based two-tier multiple choices diagnostic test. The research method used was quantitative and qualitative method. This research was conducted in class XI MIPA 3 and XI MIPA 4, Senior High School 1 Ungaran. The research procedure was designed starting from selecting the difficult subjects, arranging test plan, designing two-tier model of diagnostic test, designing web, tryout, analysis of tryout data, diagnostic test, interview, and analysis of concept understanding. The finding of the research that the instrument was valid and reliable. The result of students’ concept understanding of acid-base on implementation class showed that 9 of 35 students (26.86%) understood the concept thoroughly, 4 of 35 students (8.43%) got misconception, 1 of 35 students (3.71%) kept guessing, 12 of 35 students (34.86%) grasped less understanding while 9 of 35 students (26.14%) did not understand the concept of Acid-Base. The inference drawn of this recent study is that computer-based two-tier diagnostic test instrument can be used to analyze students’ concept understanding about acid-base by combined interpretation of students’ answers with several categories of concept understanding, misconception, guessing, less understanding of the concept, and failure to understand the concept.

Adsorption of [AuCl4]– on Ultrasonically and Mechanical-Stirring Assisted Mg/Al-NO3 Hydrotalcite-Magnetite Triastuti Sulistyaningsih; Sri Juari Santosa; Dwi Siswanta; Bambang Rusdiarso
Indonesian Journal of Chemistry Vol 16, No 3 (2016)
Publisher : Universitas Gadjah Mada

It has been examined the application of Mg/Al-NO3 hydrotalcite-magnetite synthesized mechanically (MHT) and ultrasonically (UMHT) by co-precipitation method as adsorbents for [AuCl4]– from aqueous solution. Two techniques of synthesis were conducted to determine the effect on the increase of adsorption ability of the [AuCl4]–. Magnetite and Mg/Al-NO3 hydrotalcite-magnetite synthesized by co-precipitation with modifications hydrothermal treatment at 120 °C for 5 h. The adsorbents were characterized by Fourier Transform Infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and Vibrating sample magnetometer (VSM). Adsorption studies were done by getting the optimum pH, optimum contact time and the optimum concentration. A result of the adsorption study of [AuCl4]– on both adsorbents was optimum at pH 3 and fitted well to Langmuir isotherm and pseudo second-order kinetic models. The adsorption capacity of UMHT (ultrasonic technique) was 66.67 mg g-1 and it was higher than that of MHT (mechanic technique), i.e. 31.25 mg g-1. This shows that the ultrasonic radiation technique can increase the adsorption capacity of the [AuCl4]–. Based on the desorption using 0.5 mol L-1 NaOH solution, more [AuCl4]– was eluted from MHT, indicating that [AuCl4]– was weakly bound on MHT than UMHT.

Perubahan Sistem Pelayanan Bebas Perpustakaan Selama Covid-19 Di Upt Perpustakaan Universitas Negeri Semarang Tri Utami Kusuma Putri; Triastuti Sulistyaningsih; Khrisna Khrisna; M. Furqon Adli
Al Maktabah : Jurnal Kajian Ilmu dan Perpustakaan Vol 7, No 1 (2022): JUNI
Publisher : Pusat Perpustakaan IAIN Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29300/mkt.v7i1.6150

Artikel ini membahas terkait perubahan sistem pelayanan bebas perpustakaan selama masa pandemi covid-19 di UPT Perpustakaaan Universitas Negeri Semarang. Tujuan dari penelitian ini adalah mempermudah pustakawan dalam memberikan pelayanan bebas perpustakaan di masa pandemi, kemudian menganalisisresponpengguna (Pemustaka) terhadap pelayanan bebas perpustakaan yang diberikan oleh UPT Perpustakaan Universitas Negeri Semarang. Metode penelitian yang digunakan adalah mixed method. Objek penelitian ini adalah 508 responden yang merupakan mahasiswa yang mengajukan bebas perpustakaan. Hasil penelitian ini yaitu sejumlah 440 orang menjawabSangatSetuju(86,6%), 60 Setuju(11,8%), 3 orang TidakSetuju(0,6 %)dan 5 orang menjawabSangatTidakSetuju (1,0%). Aspek terhadap layananbebasperpustakaanmendukungpelaksanaan 5M sejumlah 87.8 % ini juga dilihat dari respon responden yang menyatakan sangat setuju dengan pengurusan bebas perpustakaan tanpa tatap muka. Dirasa sangat efisien dan dapat mengurangi penyebaran covid-19.Kesimpulan yang didapatkan dari hasil penelitian ini adalah perubahan sistem layanan bebas perpustakaan di UPT Perpustakaan Universitas Negeri Semarangmempermudah dalam melaksanakan tugas karena dapat dikerjakan dimana saja baik di rumah atau di kantor, sehingga pelayanan bebas perpustakaan di masa pendemi covid-19 tetap dapat berjalan normal.

Preparation of Magnetite-Tannin Guava Leaves as Pb(II) Adsorbent Mochamad Hafiz Ghozali Rusmana; Triastuti Sulistyaningsih
Indonesian Journal of Chemistry and Environment Vol 4, No 2 (2021): DECEMBER 2021
Publisher : Universitas Negeri Yogyakarta

The increasing use of heavy metals in everyday life causes serious environmental pollution, one of which is the Pb(II) metal ion which is toxic to organisms. This study aimed to modify the tannins extracted from guava leaves with magnetite (Fe3O4) by coprecipitation as adsorbent of Pb(II) metal ion. The modified results were characterized using Fourier Transform Infra Red (FTIR), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), and X-Ray Diffraction (XRD). Metal ion levels of Pb(II) before and after adsorption were measured by Atomic Absorption Spectroscopy (AAS). The results showed that the tannins increased the magnetite-tannin crystal size from 85.17 to 155.66 nm. Modification of magnetite (Fe3O4) in guava leaf tannins is able to provide magnetic properties that facilitate post-adsorption separation. The optimum adsorption conditions were reached at pH 7 for magnetite-tannin and magnetite with optimum contact time. The adsorption of magnetite-tannin and magnetite occurred at 90 and 60 minutes. The maximum adsorption capacity of Pb(II) metal ions by magnetite-tannin is smaller than that of magnetite. Both adsorption processes followed the Langmuir isotherm pattern and Pseudo Order Two (Ho) kinetics.

Synthesis of magnetite using petai (Parkia speciosa) peel extract with ultrasonic waves as reusable catalysts for biodiesel production from waste frying oil Maya Rahmayanti; Annisa Nurul Syakina; Triastuti Sulistyaningsih; Budi Hastuti
Jurnal Kimia Sains dan Aplikasi Vol 26, No 4 (2023): Volume 26 Issue 4 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.4.125-132

Magnetite synthesis using petai (Parkia speciosa) peel extract using the sonochemical method (Fe3O4-PPE) has been successfully carried out. Fe3O4-PPE is applied as a catalyst in biodiesel production. This study aimed to determine the physical and chemical characteristics of Fe3O4-PPE and its ability as a reusable catalyst in biodiesel production using waste frying oil as the primary raw material. Characterization of Fe3O4-PPE was carried out using FTIR, XRD, and PSA instruments. Biodiesel was produced in 3 reaction cycles with the same Fe3O4-PPE catalyst. The results of the FTIR characterization showed that the Fe3O4-PPE catalyst had Fe-O bonds from Fe3O4 and -OH phenolic groups, -C-O, -C=C aromatic compounds derived from petai peel extract. The crystal size of the Fe3O4-PPE catalyst based on the results of calculations using Debye-Scherrer from the XRD chromatogram is 9.41 nm. The particle size of the Fe3O4-PPE catalyst based on analysis using PSA was divided into three groups, namely, 5.4 nm, 195 nm, and 2702.6 nm. Fe3O4-PPE was successfully used as a reusable catalyst for three cycles of biodiesel production using waste frying oil as raw material. The characteristics of Fe3O4-PPE before and after being used as a catalyst did not change. Based on GC-MS analysis, the fatty acid methyl ester (FAME) composition of biodiesel is palmitic acid and oleic acid.

PENGOLAHAN EMPON-EMPON PASCAPANEN DALAM UPAYA MENINGKATKAN DAYA JUAL PRODUK UNTUK MENUNJANG KESEJAHTERAAN KELUARGA Triastuti Sulistyaningsih; Sri Mursiti
Jurnal Abdimas Vol 18, No 2 (2014): December 2014
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/abdimas.v18i2.5739

Telah dilakukan kegiatan pengolahan empon-empon pascapanen dalam upaya meningkatkan daya jual produk untuk menunjang kesejahteraan keluarga di Kelurahan Pakintelan Kecamatan Gunungpati Kota Semarang. Masyarakat Pakintelan banyak menanam tanaman empon-empon tetapi belum dapat mengolah menjadi produk yang lebih bernilai ekonomis pasca panennya. Saat ini telah banyak dijual ekstrak kunyit-asam, ekstrak temulawak, ekstrak jahe, dan ekstrak beras kencur yang digunakan sebagai minuman penyegar, dapat diminum dengan air panas ataupun dengan air dingin. Ekstrak-esktrak tersebut merupakan hasil pengolahan rimpang empon-empon dengan metode tertentu. Produk tersebut dikemas dalam kantong plastik yang menarik dan higienis serta memiliki harga jual yang lebih tinggi dibanding bila masih dalam bentuk rimpang, namun kesemuanya ini bukan hasil produksi petani di wilayah Kelurahan Pakintelan Kecamatan Gunungpati Kota Semarang, maka perlu diadakan kegiatan untuk mengolah empon-empon menjadi produk yang lebih bernilai ekonomis yaitu menjadi esktrak bergula. Kerangka pemecahan masalah yang ditempuh adalah: 1) merancang prosedur pengolahan empon-empon; 2) uji coba hasil nomor 1; 3) pengenalan prosedur pengolahannya kepada khalayak sasaran. Metode yang digunakan adalah ujicoba, pelatihan dan diskusi. Para peserta sangat antusias dalam kegiatan ini , terlihat pada acara diskusi dan kehadiran peserta pada pelatihan yang mencapai 90%. Respon peserta sangat positip sehingga jika ada kesempatan lain kegiatan pengadian seperti ini dilanjutkan lagi terutama kegiatan yang langsung dapat dirasakan manfaatnya oleh masyarakat.

Chemistry Practicum Learning During the Covid-19 Pandemic: Determining the pH Scale of Acid-Base Natural Indicators with Semi-Quantitative Analysis Using Spectrum Color Measure Software Siti Herlina Dewi; Sri Haryani; Triastuti Sulistyaningsih
International Conference on Science, Education, and Technology Vol. 7 (2021)
Publisher : Universitas Negeri Semarang

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

Learning in the laboratory or lab course is very crucial and inseparable in studying chemistry. Since the covid-19 pandemic, student's activities wet-laboratories were almost has eliminated. Several methods have been implementing to accomodating laboratory experiences, such as learning videos, virtual laboratories, and practicals using household/kitchen equipment (lab at home). This study aims to analyze the creative thinking skills of first-year chemistry students after implementing a do lab at home lab course. The learning activities embrace students to done, not only qualitative but also quantitative (semi-quantitative) analysis. The research was conducted in 2 classes of first-year chemistry students and focused on the aside-alkalimetry titration material. This study uses a mixed-method with explanatory sequential mixed methods design. The results of data analysis were showed an improvement in student's conceptual understanding, although it was not statistically significant. Even so, the level of student's creative thinking was increasing a lot. It founds that students could provide differents equipment and materials in the same problem, even beyond the goal learning expectation. Some students have high enthusiasm for the project design process. In addition, basic scientific skills, such as observing, formulating hypotheses, collecting data, and data analyze improved a lot too because they do a science lab.

Lampung Natural Zeolite Dopped with of ZnO-TiO2 Metal Oxide as Catalyst for Biodiesel Production Al Muttaqii, Muhammad; Marbun, Maja Pranata; Priyanto, Sugeng; Sibuea, Andreas; Simanjuntak, Wasinton; Syafaat AM, Fuad; Silalahi Raja, Havier Samuel Huttur; Alviany, Riza; Maryani, Tri; Sulistyaningsih, Triastuti; Prasetyo, Erik; Sudibyo, Sudibyo; Yati, Indri
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 1 Year 2024 (April 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20038

Research has been carried out on making biodiesel from palm oil using natural zeolite catalysts impregnated with metal oxides such as zinc oxide and titanium oxide. This research aims to produce biodiesel using natural zeolite and ZnO-TiO2/NZ catalysts. The catalysts were analyzed using X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), Scanning Electron Microscope (SEM), and Brunauer-Emmet-Teller (BET). The catalyst was tested in the transesterification reaction to produce biodiesel. The mole oil and methanol ratio varied from 1:15, 1:18, and 1:20. In addition, the biodiesel product was analyzed using Gas Chromatography-Mass Spectroscopy (GC-MS). The results showed the optimum condition for converting triglycerides to 1:18 variation of oil:methanol was 60.53%using a ZnO-TiO2/NZ catalyst. The ZnO-TiO2/NZ catalyst is very promising for use as a catalyst for converting palm oils into biodiesel.

Immobilization of Bacillus subtilis on Fly Ash-Based Geopolymers with Biochar as a Self Healing Material Kulsum, Ummi; Triastuti Sulistyaningsih; Ella Kusumastuti
Indonesian Journal of Chemical Science Vol. 13 No. 3 (2024): Indonesian Journal of Chemical Science
Publisher : Prodi Kimia

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

Geopolimer merupakan material konstruksi yang ramah lingkungan namun tidak luput dari kerusakan berupa retak. Salah satu upaya untuk memperbaiki dan menutup microcrack pada geopolimer yaitu self healing geopolimer, dengan cara menambahkan healing agent ke dalamnya. Penelitian ini bertujuan untuk mengetahui dampak penambahan bakteri Bacillus subtilis sebagai healing agent terhadap kualitas geopolimer. Sintesis geopolimer dilakukan dengan mencampurkan larutan alkali dan fly ash, selanjutnya Bacillus subtilis dan kalsium laktat dimasukkan dalam biochar dengan variasi tingkat pengenceran bakteri 10-1, 10-2, 10-3, 10-4, 10-5, 10-6 dan ditambahkan ke dalam pasta geopolimer. Kualitas geopolimer yang dihasilkan dianalisis dengan uji UPV (Ultrasonic Pulse Velocity) dan uji kuat tekan. Analisis kualitatif dilakukan pada geopolimer terbaik yaitu analisis gugus fungsi dengan FT-IR, fasa mineral dengan XRD, dan morfologi permukaan dengan SEM-EDX. Hasil penelitian menunjukkan bahwa penambahan healing agent memberikan peningkatan hasil UPV dan nilai kuat tekan. Geopolimer yang memiliki kualias terbaik dalam penelitian ini yaitu geopolimer dengan penambahan bakteri Bacillus subtilis pada pengenceran 10-1 (G-1) dengan nilai kuat tekan sebesar 20,6664 MPa. Hasil analisis gugus fungsi pada sampel geopolimer dengan dan tanpa penambahan healing agent tidak menghasilkan perubahan yang signifikan. Hasil analisis fasa mineral menunjukkan fasa amorf geopolimer. Hasil morfologi menunjukkan terbentuknya matriks geopolimer yang homogen. kata kunci : fly ash, self healing geopolimer, Bacillus subtilis Geopolymer is an environmentally friendly construction material but is not immune to damage in the form of cracks. One effort to repair and close microcracks in geopolymer is self-healing geopolymer, by adding healing agents to it. This research aims to determine the impact of adding Bacillus subtilis bacteria as a healing agent on the quality of geopolymer. Geopolymer synthesis was carried out by mixing alkaline solution and fly ash, then Bacillus subtilis and calcium lactate were added to biochar with varying levels of bacterial dilution 10-1, 10-2, 10-3, 10-4, 10-5, 10-6 and added into geopolymer paste. The quality of the resulting geopolymer was analyzed using the UPV (Ultrasonic Pulse Velocity) test and compressive strength test. Qualitative analysis was carried out on the best geopolymers, namely functional group analysis using FT-IR, mineral phases using XRD, and surface morphology using SEM-EDX. The research results show that the addition of healing agents provides an increase in UPV results and compressive strength values. The geopolymer that has the best quality in this research is geopolymer with the addition of Bacillus subtilis bacteria at a dilution of 10-1 (G-1) with a compressive strength value of 20.6664 MPa. The results of functional group analysis on geopolymer samples with and without the addition of healing agents did not produce significant changes. The results of mineral phase analysis show an amorphous phase of geopolymer. Morphology results show the formation of a homogeneous geopolymer matrix. keyword : fly ash, self healing geopolymer, Bacillus subtilis

Effect of Acid-Base Composition on Physical Characteristicsand Antioxidant Activity of “Beras Kencur” EffervescentTablet Widi Astuti; Radenrara Dewi Artanti Putri; Triastuti Sulistyaningsih; Ghaefira Tasya Azany; Natasya Viona Alexandra; Ria Saputri; Reni Ainun Jannah; Danang Subarkah Hadikawuryan; Zulfa Ajrina Fitri
Sainteknol : Jurnal Sains dan Teknologi Vol. 22 No. 2 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v22i2.20080

This study aimed to evaluate the effect of acid-base ratio on the physical characteristics and antioxidant activity of the beras kencur effervescent tablet formulation. The formulation determination was based on the percentage inhibition value, where the highest value (76.2%) was found in beras kencur at 10 mg/mL, so that 1.5 g is needed to achieve the highest potential of radical scavenging activity. In this case, 1.5 g of sample was then incorporated into three effervescent tablets. The acid-to-base ratios used in this study were 1: 1.25 (F1), 1: 1.50 (F2), and 1: 2.50 (F3). The tablets were evaluated for pH, dissolution time, total phenolic content (TPC), and antioxidant activity. The results showed that a higher proportion of base (F3) improved solubility. Meanwhile, antioxidant activity evaluated using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) test, and total phenolic content determined using Folin-Ciocalteau, showed that tablets with a higher proportion of acid exhibited higher total phenolic content. However, considering that all three samples have very strong antioxidant activity, it can be concluded that F3 is the optimal formulation.

Co-Authors - Jumaeri Agung Tri Prasetya Agustina Dwi Rahmawati Ainul, Ahmad Akhib Al Muttaqii, Muhammad Alawiyah, Nur Amanda Shinta Maylani, Amanda Shinta Anita Rahayu Annisa Nurul Syakina Bambang Rusdiarso Budi Hastuti Danang Subarkah Hadikawuryan Darmadinata, Mariyanti Darmadinata, Mariyanti Dewi, Siti Herlina Dhidik Prastiyanto Dirmanto, Agus Dwi Siswanta Edy Cahyono Eisdiantoro, Sunarko Eko Budi Susatyo Ella Kusumastuti Ella Kusumastuti, Ella Endang Susilaningsih Endang Susilaningsih Erik Prasetyo F Widhi Mahatmanti Ghaefira Tasya Azany Haditya, Ervan Bagus Hidayah, Miftachul Hidayah, Miftachul Isnaeni, Diana Isnaeni, Diana Kasmadi Imam Supardi Khrisna Khrisna M. Furqon Adli Marbun, Maja Pranata MARIA BINTANG Maryani, Tri Maya Rahmayanti Mochamad Hafiz Ghozali Rusmana Mulyasari, Mursalina Mulyasari, Mursalina Murbangun Nuswowati Natasya Viona Alexandra Nugraha, Muhammad Septian Nugraha, Muhammad Septian Nuni Widiarti Nur Imaniah, Nur Prasasti, Hesti Pratomo, Sigit Wahyu Pratomo, Sigit Wahyu PUJI LESTARI Purniawati, Henny Radenrara Dewi Artanti Putri Rahmawati, Lidia Reni Ainun Jannah Ria Saputri Riza Alviany Rochmah, Vinny Rochmah, Vinny Rusadi, Eka Rusadi, Eka S Mursiti Safitri, Tsania Safitri, Tsania Samuel Budi Wardhana Kusuma Sari, Ajeng Arum Sarifa, Zakiyatu Selli Renata Sari, Selli Renata Setyo, Slamet Budi Sibuea, Andreas Silalahi Raja, Havier Samuel Huttur Sintia Ayu Dewi Siti Herlina Dewi Siti Kholipuk, Siti Sri Haryani Sri Haryani Sri Juari Santosa Sri Mantini Rahayu Sedyawati, Sri Mantini Rahayu Sri Martini Rahayu Sedyawati Sri Mursiti SRI WARDANI Subiyanto Hadisaputro, Subiyanto Sudarmin Sudarmin Sugeng Priyanto, Sugeng Syafaat AM, Fuad Tri Utami Kusuma Putri Umayah, Isponi Umayah, Isponi Ummi Kulsum Wahyu Rahmawati, Aliftia Wahyu Rahmawati, Aliftia Warlan Sugiyo Wasinton Simanjuntak Widi Astuti Widi Astuti Wismaningati, Putri Wisnu Sunarto Wulandari, Ari Vitri Wulandari, Ari Vitri Yasmine, Luigy Maurizka yati, indri Yunita, Anfi'na Ilma Zulfa Ajrina Fitri

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