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All Journal Jurnal Biologi Udayana MEDIA KOMUNIKASI TEKNIK SIPIL SAINS DAN MATEMATIKA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Lingkungan Elkawnie Jurnal Noken: Ilmu-Ilmu Sosial Indonesian Journal of Chemistry Pendas : Jurnah Ilmiah Pendidikan Dasar Diglosia: Jurnal Kajian Bahasa, Sastra, dan Pengajarannya Molekul: Jurnal Ilmiah Kimia Journal of Local Government Issues Community Development Journal: Jurnal Pengabdian Masyarakat International Journal of Sustainable Transportation Technology Jurnal Sains dan Edukasi Sains Journal of Science and Science Education Humanism : Jurnal Pengabdian Masyarakat JSIP: Jurnal Studi Ilmu Pemerintahan Greensphere: Journal of Environmental Chemistry jurnal administrasi politik dan sosial SIMBOL : Jurnal Administrasi Publik dan Pemerintahan Jurnal Edukasi dan Pengabdian kepada Masyarakat (JEPKM) Molekul: Jurnal Ilmiah Kimia Bulletin of Chemical Reaction Engineering & Catalysis Journal of Community Empowerment JURNAL REKAYASA KIMIA & LINGKUNGAN Economy Bring Ultimate Information All About Development Journal

Yayuk Astuti

Chemistry Department, Faculty Of Science And Mathematics, Universitas Diponegoro, Jl. Prof. Jacob Rais, Tembalang, Semarang 50275

Author-ID : 3037473

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Transportation Other

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Synthesis of Zeolite from Bagasse and Rice Husk Ashes as Surfactant Builder on Detergency Process: Variation of NaOH Concentration for Silica Isolation Arnelli Arnelli; Bara Yunianto Fathoni; Teguh Iman Prastyo; Ahmad Suseno; Yayuk Astuti
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Zeolite was successfully synthesised from ash bagasse and from rice husk ash as source of silica and applied to surfactant builder. The removal of silica from bagasse ash and from rice husk ash was influenced by NaOH concentration to obtain sodium silicate. This research aimed to synthesize zeolite, determine the optimum concentration of NaOH to synthetic zeolite, identify the zeolite mineral type, morphology, determine cation exchange rate and detergency by using synthesized zeolite as builder. Synthesis of zeolite was undertaken by sol-gel method followed by hydrothermal process. The stages of this study included the production of bagasse and rice husk ashes, isolation of silicate using a variation of NaOH concentration of 1.67, 3.33, 5.00, 6.67 and 8.30 M in the form of sodium silicate. Synthesis of zeolite was carried out by reacting sodium silicate and sodium aluminate using hydrothermal method. The synthesized zeolites were characterized using XRD and SEM. The results of this research indicated the types of zeolite minerals formed, namely, zeolite A, Na-A, Na-Y and sodalite. The morphology of the synthesized zeolites from both samples was quite homogeneous, NaOH concentration used to produce zeolite from bagasse ash was 1.67 M with value of cation exchange capacity (CEC) and detergency were respectively 121.14 mek/100 gram and 92.09% while synthesis zeolite from rice husk ash was generated using 8.3 M NaOH concentration with value of cation exchange capacity (CEC) and detergency were 65,71 mek / 100 gram and 94,313%, respectively.

Effect of LiTFSI Electrolyte Salt Composition on Characteristics of PVDF-PEO-LiTFSI-Based Solid Polymer Electrolyte (SPE) for Lithium-Ion Battery Hasim Muzadi; Nayla Zahra Kamalia; Titik Lestariningsih; Yayuk Astuti
Molekul Vol 18 No 1 (2023)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2023.18.1.6446

A lithium-ion battery with PVDF-PEO synthetic polymer sheet added by LiTFSI electrolyte salt has been made by assembling method. This study aims to determine the effect of LiTFSI salt concentration on the performance of lithium-ion batteries. The composition of LiTFSI electrolyte salts was varied into 5%; 10%; 15%; and 20%. Several characterizations were carried out to determine battery performance, including Electrochemical Impedance Spectrometry (ElS), Cyclic Voltammetry (CV), Charge/Discharge (CD), and Lithium Transference Number (LTN). The results showed that the synthesized separator sheet with a LiTFSI salt composition of 20% producing voltage, ionic conductivity, and lithium-ion transfer number of 0.72 V; 3.94 x 10-8 SCm-1; and 0.895, respectively is potential for lithium-ion batteries application. These results indicate the use of LiTFSI electrolyte salts with a concentration of 20% shows the best performance for PVDF-PEO-LiTFSI-based lithium-ion batteries.

French Fries-Like Bismuth Oxide: Physicochemical Properties, Electrical Conductivity and Photocatalytic Activity Yayuk Astuti; Fauzan Musthafa; Arnelli Arnelli; Iis Nurhasanah
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 1 Year 2022 (March 2022)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.1.12554.146-156

Bismuth oxide synthesis using hydrothermal method has been conducted. This study aims to examine the effect of the hydrothermal reaction time on product characteristics and photocatalytic activity in degrading methyl orange dye. Bismuth oxide synthesis was initiated by dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) and Na2SO4 in a distilled water and added NaOH gradually. The solution formed was transferred into a Teflon-lined autoclave and heated at 120 °C with time variations of 8–16 h. The formation of bismuth oxide was indicated by the vibrations of the Bi−O−Bi and Bi−O groups and the crystal structure consisting of a-Bi2O3, β-Bi2O3, and g-Bi2O3. In addition, the highest photocatalytic activity can be examined through several factors, such as: content of Bi−O−Bi and Bi−OH groups, crystal structure, band gap values, morphology, and surface area, acquired as a result of the effect of hydrothermal reaction time. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Hydrazine-Fueled Solution Combustion Method: Fuel/Oxidizer Ratio Effects on Photocatalytic Performance of Bismuth Oxide Yayuk Astuti; Trie Nanda Mulyana; Brainy Happy Ana Tasiman; Adi Darmawan; Hendri Widyandari
Bulletin of Chemical Reaction Engineering & Catalysis 2023: BCREC Volume 18 Issue 3 Year 2023 (October 2023)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.19943

Bismuth oxide nanoparticles were synthesized through the solution combustion method with a variation of fuel: oxidizer (hydrazine: bismuth nitrate) ratios (ϕ) of ϕ<1, ϕ=1 (stoichiometrically balanced) and ϕ> 1. Bismuth oxide nanoparticles were characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and UV-Visible Diffuse Reflectance Spectroscopy (UV-DRS). The FTIR spectra obtained implies that the bismuth oxide nanoparticles of the three ratios contain Bi-O-Bi and Bi-O groups indicating its successful formation. XRD diffractogram suggests that the synthesized bismuth oxide nanoparticles form the α-Bi2O3 crystalline phase for ϕ<1 and ϕ>1; meanwhile a mixture of α-/β- Bi2O3 phases for ϕ=1. The SEM image illustrates that bismuth oxide nanoparticles form pebble shapes with the ratios in the order of increasing particle sizes of ϕ>1, ϕ=1, and ϕ<1. The UV-DRS results show that the bismuth oxide with ϕ<1, ϕ=1, and ϕ>1 have respective band gap energies of 2.76 eV, 2.72 eV, and 2.78 eV. The evaluation of the photocatalytic activity of the three bismuth oxide samples shows bismuth oxide with ϕ=1 has the highest photocatalytic activity in remazol black B and methyl orange dyes with rate constants 6.744 x 10-5 s-1 and 7.369 x 10-5 s-1, respectively. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Hydrazine and Urea Fueled-Solution Combustion Method for Bi2O3 Synthesis: Characterization of Physicochemical Properties and Photocatalytic Activity Yayuk Astuti; Prisca Putri Elesta; Didik Setyo Widodo; Hendri Widiyandari; Ratna Balgis
Bulletin of Chemical Reaction Engineering & Catalysis 2020: BCREC Volume 15 Issue 1 Year 2020 (April 2020)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.15.1.5483.104-111

Bismuth oxide synthesis using solution combustion method fuelled by hydrazine and urea has been conducted. This study aims to examine the effect of the applied fuels, urea and hydrazine, on product characteristics and photocatalytic activity in degrading rhodamine B dye. Bismuth oxide synthesis was initiated by dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) in a nitric acid solvent. Fuel was added and then stirred. The solution formed was heated at 300 ºC for 8 hours. The product obtained was then calcined at 700 ºC for 4 hours. Bismuth oxide synthesized with urea (BO1) and hydrazine (BO2) as fuels both obtained form of yellow powder. The formation of bismuth oxide is indicated by the vibrations of the Bi–O–Bi and Bi–O groups and the crystal structure of a-Bi2O3 in both products. Photocatalytic activity test showed that BO1 has a photocatalyst activity in degrading rhodamine B higher than that of BO2 with constant values of 3.83×10-5 s-1 and 3.43×10-5 s-1, respectively. The high photocatalytic activity can be examined through several factors, such as: band gap values, crystal structure, morphology, and surface area, acquired as a result of the use of different fuels in the synthesis process. Copyright © 2020 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Effect of Co and Mo Loading by Impregnation and Ion Exchange Methods on Morphological Properties of Zeolite Y Catalyst Didi Dwi Anggoro; Nur Hidayati; Luqman Buchori; Yayuk Mundriyastutik
Bulletin of Chemical Reaction Engineering & Catalysis 2016: BCREC Volume 11 Issue 1 Year 2016 (April 2016)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.11.1.418.75-83

Coal tar can be used as an alternative raw material for the production of liquid fuels, such as: gasoline and diesel through hydrogenation and cracking process. Hydrogenation and cracking process requires a catalyst which has metal components for hydrogenation reaction and acid components for cracking reaction. In this study, the Co/Zeolite Y and Co-Mo/Zeolite Y catalysts were prepared by impregnation and ion exchange methods. Characterizations of the catalysts were carried out by X-Ray Diffraction (XRD) and gravimetric acidity. The catalysts were tested for coal tar conversion to liquid fuel under various temperatures, amount of catalyst and hydrogen flow rates in a fixed bed flow reaction system. Liquid fuels products were analyzed by gas chromatography (GC). The XRD Spectra indicated that the addition of Co and Mo metals did not affect catalysts structure, however it alters the percentage of crystallinity. The addition of Co metal using impregnation method caused reduction in crystallinity, while the addition of Mo caused improvement of crystallinity. The Co-Mo/Zeolite Y catalyst with highest crystallinity was obtained by loading using ion exchange method. The addition of Co and Mo metals caused increasing acidity. However, the increasing composition of Co and Mo loaded on Zeolite Y catalyst decreased the yield of liquid fuels from coal tar. It can be concluded that the yields of liquid fuels and the composition of gasoline fractions from hydrocracking of coal tar were highly dependent on acidity of the catalyst.

Improving the Electrical Conductivity of the Composite Comprising Bismuth Oxide, Activated Carbon, and Graphite for Use as a Battery Anode Yayuk Astuti; Faradina Azahra Zaqia; Aulia Zahra Ekaningsih; Gunawan Gunawan; Adi Darmawan
Indonesian Journal of Chemistry Vol 23, No 6 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.74155

This research is concerned with the synthesis and characterization of a composite material that may be used as a battery electrode. Bismuth oxide (Bi2O3) was synthesized from Bi(NO3)3·5H2O, Na2SO4, and NaOH mixed with commercial activated carbon and graphite. The composite formation process was carried out using the hydrothermal method at 110 °C for 5 h. The characterization data indicated the composites produced contained Bi2O3 with a monoclinic crystal system, and Bi2O3 particles were evenly distributed in the composite. The composites were characterized to be mesoporous, with the electrical conductivity reaching 10−1 S m−1. The development of this composite material has potential applications in the field of energy storage, particularly in the development of battery anode.

Analisis Kualitas dan Tingkat Pencemaran Limbah B3 Terlarut di Aliran Sungai Cideng Nabila Amalia Izaaz Aanisa; Rahmawati Rahmawati; Brainy Happy Ana Tasiman; Yayuk Astuti
Jurnal Ilmu Lingkungan Vol 22, No 1 (2024): January 2024
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.22.1.215-227

Sungai Cideng adalah salah satu sungai yang mengalir di DKI Jakarta. Dengan lokasi berada di tengah kota Sungai Cideng terletak diantara Gedung perkantoran, Rumah sakit, klinik, dan industry dapat menyebabkan tingginya sumber pencemar masuk ke badan air yang menghasilkan limbah dengan kandungan logam berat tinggi seperti limbah yang mengandung merkuri, timbal, cadmium atau bahan kimia beracun berbahaya (B3). Penelitian ini bertujuan untuk menganalisis kualitas air sungai Cideng dilihat dari tingkat pencemaran Limbah B3 (Merkuri (Hg), Timbal (Pb), dan Kadmium (Cd)). Pengukuran lapangan dan pengujian laboratorium merupakan metode yang digunakan pada penelitian ini karena bersifat deskriptif yang disebut sebagai metode observasional. Penelitian dilakukan di Tahun 2021 selama 4 periode yang mewakili musim hujan (Periode 1), musim peralihan-1 (Periode 2), musim kemarau (Periode 3) dan musim peralihan-2 (Periode 4). Sampel diambil pada 3 titik sungai (CDG-5, CDG-6, dan CDG-7). Untuk logam berat timbal (Pb) dan kadmium (Cd) dianalisis dengan Atomic Absorption Spectrophotometer (AAS), sedangkan logam merkuri (Hg) dianalisis dengan Mercury Analyzer. Hasil dari penelitian menunjukkan bahwa kualitas air Sungai Cideng sesuai batas mutu, kandungan logam Hg bernilai <0,00005-0,001 mg/L, kandungan logam Pb menunjukkan nilai <0,02 mg/L, dan kandungan logam cadmium (Cd) bernilai <0,006 mg/L. Hasil ini menunjukan bahwa Sungai Cideng tidak tercemar oleh limbah B3 karena nilainya berada di bawah baku mutu yang ditetapkan menurut PP No. 22 Tahun 2021.

Pengaruh CoO dan TiO2 terhadap Warna Glasir Porselen ZnO Vega Norma Rafika Putri; Nurul Latifah; Yayuk Astuti
Jurnal Kimia Sains dan Aplikasi Vol 20, No 2 (2017): Volume 20 Issue 2 Year 2017
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Telah dilakukan kajian pengaruh penambahan kobalt dan titanium oksida terhadap warna glasir porselen ZnO yang bertujuan untuk menentukan pengaruh jenis dan konsentrasi oksida logam terhadap warna glasir keramik porselen dengan prinsip pergantian atom pada sisi kristal sehingga menghasilkan warna. Metode yang digunakan dalam percobaan ini adalah pembakaran dan spray. Sampel yang diuji adalah glasir kobalt oksida dan titanium dioksida. Berdasarkan percobaan diketahui bahwa oksida logam yang berbeda akan menghasilkan warna glasir yang berbeda pula. Semakin besar konsentrasi oksida logam yang ditambahkan maka warna glasir yang diperoleh juga semakin gelap atau jelas.

Pengaruh Variasi Waktu Hidrotermal terhadap Sintesis dan Karakterisasi Nanokristal Zeolit A dari Abu Sekam Padi Pungki Hanipa; Pardoyo Pardoyo; Taslimah Taslimah; Arnelli Arnelli; Yayuk Astuti
Jurnal Kimia Sains dan Aplikasi Vol 20, No 2 (2017): Volume 20 Issue 2 Year 2017
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Sekam padi merupakan salah satu produk samping dari penggilingan padi. Silika amorf hasil ektraksi dari sekam padi dapat di manfaatkan untuk pembuatan zeolit. Penelitian ini bertujuan untuk memperoleh nanokristal zeolit A dari abu sekam padi dan menentukan karakter dari produk nanokristal zeolit A hasil sintesis. Hasil dari penelitian ini adalah diperoleh zeolit berupa serbuk putih menggunakan metode hidrotermal dengan variasi waktu hidrotermal selama 1, 2, dan 3 hari. Analisis menggunakan XRD menunjukkan bahwa ketiga zeolit hasil sintesis merupakan zeolit A dengan ukuran bulir kristal semakin menurun dengan bertambahnya waktu hidrotermal di mana masing- masing ukurannya adalah 34,321; 34,21; dan 34,144nm dan puncak utama berada pada 2theta 21°, 23°, 27°, 29° dan 34°. Analisis morfologi permukaan zeolit sintesis menunjukkan ketiga zeolit sintesis memiliki morfologi permukaan berupa kubus.

Co-Authors Abdul Gafur Abdul Jabbar Adi Darmawan ADI SANTOSO Agriccia Pangestica Saputry Ahmad Suseno Alfi Saadah Alfiansyah Alfiansyah Amilia Fauziyah Anisyah Anisyah Annisa Syifaurrahma Arnelli Arnelli Arum Dista Wulansari Aswadi Aswadi Aulia Zahra Ekaningsih Azwar Thaib Bara Yunianto Fathoni Brainy Happy Ana Tasiman Brainy Happy Ana Tasiman Brigita Maria Listyani Cut Rahmawati Daniswara, Lufthansyah Dayadi, Dayadi Didi Dwi Anggoro Didik Setyo Widodo Ecca, Suleha Esti Ayu Faisal Syahputra Fandi Nasrun Cholis Faradina Azahra Zaqia Fauzan Musthafa Febrianti, Devi Fitriani Solichah Galih N. R. Pargiman Gaurav A. Bhaduri Geminastiti Sakkir Gunawan Gunawan HARTATI Hartati Hartati Hasanuddin, Fenny Hasim Muzadi Hendri Widiyandari Hendri Widiyandari Hendri Widyandari Hermasnyah, Sam Husnayani, Husnayani Ibrahim, Abdul Gafur Iis Nurhasanah Iis Nurhasanah Irman, Iriani Isumarni, Isumarni Jamaluddin Ahmad Jufri, Al Jafar Jumiati Jumiati Khalik, Suhartini Khoiri, Rahma Lia Handayani Lia Handayani Lia Handayani Linda Suyati Luqman Buchori M. S.H. Yoga S. Majid, Abdul Majid Zainuddin Mega Bara Cahyantari Muh. Fajar, Muh. Muh. Rohady Ramadhan Muhammad Hanafi Muhammad Rusdi Muslim, Agus Mustanir, Ahmad Nabila Amalia Izaaz Aanisa Narita Rizki Nayla Zahra Kamalia Nonci, Nurjannah Noor Afifah Nur Hidayati Nurhayati Nurhayati Nurhayati Nurhayati Nurjannah Nonci Nurlaelah Nurlaelah, Nurlaelah Nurul Latifah Nurwidah, Andi Pandji Triadiyaksa Pardoyo Pardoyo Pardoyo Pardoyo Popi Hadi Wisnu Wardhani Prasetya, Eko Fery Prisca Putri Elesta Pungki Hanipa R Kasau, Nurzin Rahayu, R.A. Yunita Suci Rahayu, Yunita Suci Rahmatul Fazira Rahmawati Rahmawati Ramdan, Ramdan Rasman Ratna Balgis Redi Joko Prasetyo Richard Leonardo Sianturi Rissa Kharismawati Rizka Andianingrum Roni Adi Wijaya Saade, Muhammad Faisal Samratusabri Subehan Siringoringo, Eliezer Patardo Siti Fatimah Siti Nurhayati Siti Susanti, Siti Slamet Priyono Tamrin, Muh Tang, Jusman Taslimah Taslimah Teguh Iman Prastyo Titik Lestariningsih Titik Lestariningsih Tri Windarti Tri Windarti Triadiyaksa, Pandji Trie Nanda Mulyana Trisnasari, Damayanti Ulya Hanifah Henrika Putri Vega Norma Rafika Putri Wijayanti, Septi Yeni Aprilia Yusrianti Yusrianti, Yusrianti Zainuddin, Abdul Majid Zulfahmi Zulfahmi

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