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All Journal Jurnal Bestari Reaktor International Journal of Science and Engineering (IJSE) International Journal of Renewable Energy Development TEKNIK METANA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Bahan Alam Terbarukan Waste Technology Eksergi: Chemical Engineering Journal Techno: Jurnal Penelitian Journal of Engineering and Technological Sciences Majalah Ilmiah MOMENTUM ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika International Journal of Artificial Intelligence Research Jurnal Ekonomi dan Bisnis Indonesian Journal of Chemistry Jurnal Aplikasi Teknologi Pangan Indonesia Journal of Halal PRoMEDIA Journal of Innovation in Business and Economics ULIN: Jurnal Hutan Tropis Andalas obstetrics and gynecology journal ASEAN Journal of Chemical Engineering Budimas : Jurnal Pengabdian Masyarakat Jurnal Teknik Kimia Indonesia Jurnal Pengabdian dan Peningkatan Mutu Masyarakat (JANAYU) Jurnal Ilmu Sosial Indonesia (JISI) Jurnal Energi Baru dan Terbarukan Journal of Bioresources and Environmental Sciences Jurnal Riptek Jurnal Profesi Insinyur Indonesia Journal of Bioresources and Environmental Sciences International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis JURNAL REKAYASA KIMIA & LINGKUNGAN
. Widayat
Chemical Engineering Department, Faculty Of Engineering, Diponegoro University, Jl. Prof. Soedarto, SH, Tembalang, Semarang 50275
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Produksi Hidrogen dengan Memanfaatkan Sumber Daya Energi Surya dan Angin di Indonesia Muhammad Syukri Hasan; Widayat Widayat
Jurnal Energi Baru dan Terbarukan Vol 3, No 1 (2022): Maret 2022
Publisher : Program Studi Magister Energi, Sekolah Pascasarjana, Universitas Diponegoro, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jebt.2022.13374

Abstract

Kebutuhan energi final per jenis masih didominasi oleh penggunaan energi BBM. Sektor transportasi merupakan pengguna energi terbesar diantara sektor-sektor lainnya. Energi yang digunakan pada sektor transportasi hamper mayoritas menggunakan BBM. Oleh karena itu perlu dilakukan subtititusi BBM ke energi hidrogen sebagai energi alternatif untuk sektor transportasi. Besarnya potensi energi surya dan energi angin di Indonesia serta perkembangan teknologinya yang semakin efisien dan murah maka produksi hidrogen dapat dilakukan menggunakan metode elektrolisis yang mudah diterapkan dan murah untuk diproduksi untuk masa depan. Produksi Hidrogen skala besar menggunakan Elektrolisis air membutuhkan banyak supplai air. Oleh karena itu potensi air laut di Indonesia dapat digunakan sebagai bahan baku subtitusi air tawar. Pemanfaatan Hidrogen dengan fuel cell dapat digunakan sebagai sumber energi listrik untuk moda transportasi seperti mobil listrik dan sepeda motor listrik yang saat ini mulai berkembang.
Efek Aerasi terhadap Perubahan Residu H2O2 Air Fermentasi Mocaf (Modified Cassava Flour) Nurul Yaqin; Ahmad Ni'matullah Al-Baarri; Mochamad Arief Budihardjo; Widayat Widayat
Jurnal Aplikasi Teknologi Pangan Vol 9, No 1 (2020): February 2020
Publisher : Faculty of Animal and Agricultural Sciences, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17728/jatp.6181

Abstract

Penelitian ini bertujuan untuk mengetahui perubahan kadar H2O2 yang berpotensi menjadi pencemar lingkungan beserta parameter kualitas air fermentasi mocaf (AFM) lainnya setelah diberikan perlakuan aerasi. Limbah mocaf  yang diberikan perlakuan aerasi mengalami penurunan kadar H2O2 lebih besar dari non aerasi. Berdasarkan uji beda T-test antara perlakuan aerasi dengan non aerasi kadar H2O2 memiliki perbedaan yang signifikan (sig. p= 0,018, p<0,05).  AFM non aerasi mengalami penurunan L* sebesar 5,9%, sedangkan perlakuan aerasi menurun lebih besar dengan persentase penurunan sebesar 15,8%. TDS AFM tidak mengalami perbedaan yang signifikan antara perlakuan aerasi dengan non aerasi (P= 0,226 ,p>0,05) demikian juga dengan pameter turbiditas (P= 0,117, P>0,05) dan OD 610 nm (P= 0,987, P> 0,05). 
Analisis Kadar Etanol dalam Obat Batuk dengan Metode Kromatografi Cair Arianti Nuur Annisa; Handung Nuryadi; Widayat Widayat; Dita Ayu Sofiati
Indonesia Journal of Halal Vol. 2 (1) 2019
Publisher : Pusat Kajian Halal Undip

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (441.377 KB) | DOI: 10.14710/halal.v2i1.5277

Abstract

Etanol merupakan senyawa kimia yang umum digunakan sebagai pelarut dalam obat-obatan. Keberadaan etanol dalam obat dapat diragukan kehalalannya. Diperlukan analisa kandungan etanol dalam suatu produk. Kromatografi cair merupakan metode yang akurat untuk mengetahui keberadaan etanol dalam sampel. Penelitian ini bertujuan untuk menganalisa kandungan etanol dalam obat batuk menggunakan metode HPLC. Metode yang dilakukan terdiri dari persiapan standar etanol dan sampel obat batuk, serta analisa sampel dengan HPLC. Data hasil analisa diolah dengan menggunakan software Lab Solutions. Selanjutnya disusun kurva analitik dan persamaan linear. Hasil analisa menunjukkan sampel obat batuk jenis XXX memiliki kandungan senyawa etanol. Dari hasil yang diperoleh dapat disimpulkan bahwa metode HPLC tepat digunakan untuk menentukan kehalalan suatu produk.
Real Time-Polymerase Chain Reaction (RT-PCR) sebagai Alat Deteksi DNA Babi dalam Beberapa Produk Non-Pangan Widayat Widayat; Tri Winarni Agustini; Meiny Suzery; Ahmad Ni’matullah Al-Baarri; Sylvia Rahmi Putri; Kurdianto Kurdianto
Indonesia Journal of Halal Vol. 2 (1) 2019
Publisher : Pusat Kajian Halal Undip

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (434.043 KB) | DOI: 10.14710/halal.v2i1.5361

Abstract

Bagi seorang muslim status halal suatu produk non-pangan salah satunya kosmetik maupun obat-obatan sangat mutlak yang harus dipenuhi. Produk yang beredar dipasaran harus terbebas dari kandungan babi atau bahan lain yang menyebabkan produk tersebut tidak lagi halal. Metode Real Time Polymerase Chain Reaction (RT-PCR) yang dapat mendeteksi kandungan babi maupun alkohol untuk dapat memastikan kandungan tersebut terbebas dari cemaran babi. Dalam penelitian ini, telah dilakukan analisis kemungkinan adanya kandungan unsur babi dari ke empat produk non-pangan seperti kapsul, kuas roti, day cream dan sabun kecantikan yang dianalisis menggunakan RT-PCR.Penelitian ini dibagi menjadi dua tahap, tahap awal dilakukan ektraksi DNA dan tahap kedua dilakukan analisis RT-PCR. Didapatkan pada tahap awal ekstraksi DNA, hasil pengukuran dan kemurnian dengan nilai konsentrasi kapsul 2,9 ng/µI; kuas roti sebesar 3,4 ng/µI; day cream sebesar 2,4 ng/µI; dan sampel sabun kecantikan sebesar 2,2 ng/µI. Pada tahap kedua, secara keseluruhan dari ke empat produk yang dipilih secara acak sebagai objek penelitian produk kapsul terbebas dari kandungan babi, kecuali pada produk kuas roti sebesar 3,15%; day cream sebesar 3,52%; dan sabun kecantikan sebesar 124,83% positif tercemar kandungan babi.
Hydrocracking of Coconut Oil on the NiO/Silica-Rich Zeolite Synthesized Using a Quaternary Ammonium Surfactant Sriatun Sriatun; Heru Susanto; Widayat Widayat; Adi Darmawan
Indonesian Journal of Chemistry Vol 21, No 2 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.55522

Abstract

NiO/silica-rich zeolite catalysts were used for coconut oil hydrocracking. The catalyst was prepared with a mixture of Na2SiO3, Al(OH)3, NaOH, and quaternary ammonium surfactants. The surfactant was varied of types like as tetrapropylammonium bromide (TPAB) and cetyltrimethylammonium bromide (CTAB). The acidity of the silica-rich sodalite zeolites enhances with the increase in nickel oxide added through a wet impregnation. The hydrocracking process was carried out by a semi-batch method. Liquid products were analyzed using GC-MS. The results showed that the addition of surfactants increased the catalyst surface area and acidity. Meanwhile, the presence of nickel oxide increases the acidity of the catalyst. The hydrocracking results showed an increase in gas products when the surface area was high, i.e., 23.781% in silica-rich sodalite zeolite without template (Z), 32.68% in silica-rich sodalite zeolite with tetrapropylammonium (ZTPA), and 39.673% in silica-rich sodalite zeolite with cetyltrimethylammonium (ZCTA). The presence of NiO increased the liquid product and the selectivity of the bioavtur fraction (C10-C15), where the highest percentage of liquid product was 60.07% at NiO/ZTPA.
Pengaruh Pengurangan Laju Alir Udara Proses pada Unit Secondary Reformer (103-D) terhadap Konsumsi Energi Pada Pabrik Amoniak Pupuk Kaltim 5 Fauzandy Husna Setyanto; Puja Chrisdianto Manapa; Widayat Widayat
Jurnal Energi Baru dan Terbarukan Vol 3, No 2 (2022): Juli 2022
Publisher : Program Studi Magister Energi, Sekolah Pascasarjana, Universitas Diponegoro, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jebt.2022.14160

Abstract

Secondary reformer merupakan alat yang berfungsi untuk mengonversi dari metana (CH₄) menjadi syn gas (H₂). Gas metana akan bereaksi dengan oksigen (O₂) yang berasal dari udara atmosfer untuk membentuk H₂ yang nantinya akan disintesis menjadi amoniak pada unit ammonia converter. Sementara itu gas metana yang tersisa akan dimanfaatkan kembali sebagai secondary fuel pada primary reformer, energi yang dihasilkan dari reaksi pembentukan syn gas pada secondary reformer ini kemudian digunakan untuk membangkitkan saturated steam pada unit waste heat boiler. Studi kasus ini dilakukan untuk mengetahui pengaruh pengurangan laju alir udara pada secondary reformer terhadap jumlah methane leak, energi, amoniak yang dihasilkan, dan optimasi proses suplai secondary fuel ke primary reformer. Penurunan laju alir pada secondary reformer (103-D) akan menyebabkan beberapa hal yaitu naiknya jumlah methane leak pada outlet secondary reformer, adanya peningkatan produk secondary fuel methane, adanya penurunan produk saturated steam pada waste heat boiler (101-C), penurunan pada produk amoniak yang dihasilkan pada ammonia converter (122-C2), dan konsumsi energi yang dibutuhkan per ton amoniak meningkat seiring dengan pengurangan laju alir udara dengan rata-rata peningkatan konsumsi energi sebesar 0,15 MMBTU/ton.
The Effect of NaHCO3 and Mg2+ Addition in Haematococcus pluvialis Cultivation by Carbon Injection Method W. Widayat; Annisa Metantya Maharani; Siti Nur Khairunisa Aroli; Muhammad Hilmazar Hawari
Journal of Bioresources and Environmental Sciences Vol 1, No 3 (2022): December 2022
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jbes.2022.15220

Abstract

The emission of carbon dioxide has been continuously rising year by year. Many efforts that have been used with aim of climate recovery, such as capturing CO2 with the Carbon Capture Storage (CCS) method, which is the CCS technology is one of the effective tactics for reducing carbon emissions by utilizing energy from biomass of microalgae. This research will discuss about carbon capture using microalgae Haematococcus pluvialis in a lab scale photobioreactor (PBR), and resulting the optimum biomass productivity for Haematococcus pluvialis has occurred in the H2 variable (50 ppm Mg2+). This happens because of addition of Mg ions above 50 ppm can decrease the yield of biomass productivity, since Haematococcus pluvialis cannot live in high salinity concentrations. Further research should make a calculation of optimal cost incurred at the optimal carbon concentration that can be captured by microalgae, also the results of increasing value of the microalgae biomass produced for the comprehensive use of the microalgae.
Palm Oil Milling Effluent (POME) Waste Processing by Using Microalgae Chlamydomonas sp. Riky Yonas; Uray Irzandi; Hantoro Satriadi; W. Widayat; Marcelinus Christwardana; H. Hadiyanto
Journal of Bioresources and Environmental Sciences Vol 1, No 2 (2022): August 2022
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jbes.2022.15152

Abstract

Along with the growth in oil palm output, the amount of trash produced will also increase. Every palm oil mill is responsible for the disposal of liquid waste known as palm oil mill effluent (POME). POME includes very high levels of BOD and COD, which may hinder the development of microalgae. Before POME may be utilized as a medium for the growth and development of microalgae, a detailed investigation is required to establish the pretreatment measures necessary to reduce the BOD and COD levels. The purpose of this investigation of POME waste as a substrate for the growth and development of microalgae is to examine the POME processing procedure utilizing wild microalgae. The experimental technique consisted of adding POME and microalgae to the Erlemeyer in accordance with the required proportion. Research demonstrates that POME pond IV waste may be utilized as a substrate for the development of wild microalgae to lower POME waste BOD and COD levels. The variables used were the ratio of POME to microalgae volume and the quantity of nutrients supplied. Microalgae growth at a ratio of 1:4 produced the greatest decreases in BOD and COD, namely 61.66 ppm and 173.33 ppm from 110.6 ppm and 496.67 ppm, respectively. The impact of adding nutrient C at a concentration of 120 ppm led to the greatest decrease of BOD and COD, namely 65.33 ppm and 186.67 ppm, whereas adding nutrient N at a concentration of 40 ppm led to the greatest reduction of BOD and COD, namely 55.41 ppm and 158.33 ppm.
Study of Polymeric Membranes Potential for Eugenol Purification from Crude Clove leaf Oil Tutuk Djoko Kusworo; Danny Soetrisnanto; Widayat Widayat; Budiyono Budiyono; Dani Puji Utomo
ASEAN Journal of Chemical Engineering Vol 18, No 2 (2018)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (496.391 KB) | DOI: 10.22146/ajche.49539

Abstract

Clove oil is an agricultural commodity with economic value. This essential oil can be obtained from flowers, stems, and leaves of clove plants. The quality of clove oil can be evaluated from eugenol levels in oil. An increase in eugenol levels from 70% to 98% can increase oil prices by up to 3 times. Oil obtained from clove leaves has a low eugenol content of 60-70%, therefore the purification is needed to improve the quality of oil. Membrane based separation for eugenol purification was suggested in this paper as new concept in essential oils purification processes. This study aimed to explore the suitable polymer as membrane material for eugenol purification. PES, PA, CA and PI were used in this study, where the membranes were prepared via NIPS technique using manual casting knife to form flat sheet membranes. The membranes were immersed in eugenol to evaluate the solubility. The insoluble membrane was used for purification performance test in membrane filtration cell. The results show that PES and PA membranes were completely dissolved in eugenol in less than 1 minute, while PI and CA membranes were insoluble in eugenol. However, the PI membrane has much lower solvent permeability than CA membrane. The thermal annealed PES membrane for 3 h at 180°C dissolved in eugenol in 30 minutes for complete dissolution. It is concluded that PI and CA membranes can be used as membrane material for eugenol purification but CA more favorable, while PES membrane has a potential for similar purposes after being thermal annealed. However, these findings can offer an important reference for the application of polymeric membranes for clove oil purification through an effective and efficient process.
KINETIC STUDY OF THE UTILISATION OF DIFFERENT SUBSTRATES TO LACTIC ACID USING Lactobacillus delbrueckii Abdullah Abdullah; Hanapi bin Mat; Widayat Widayat
METANA Vol 6, No 01 (2009): April 2009
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5667.593 KB) | DOI: 10.14710/metana.v6i01.1830

Abstract

Abstract   Lactic acid fermentation includes several reactions in association with the microorganism growth.  A kinetic study was performed of the utilisation of multiple substrates to lactic acid using lactobacillus delbrueckii. Batch fermentation was performed to study effect of different substrates such as glucose, fructose and sucrose. The objective of this research is to study kinetics grow microbial. A anaerobic fermentation were studied in 3 litres stirred fermentor ( Biostat B Model) with working volume of 1 liter, temperature : 40 oC, pH = 6.0, inoculums size : 5% , sugar concentration =  20 g/1. During the first hours of fermentation, glucose and fructose accumulated in the medium and the rate of  hydrolysis of sucrose to glucose and fructose was faster than conversion of these substrate. The maximum concentration of glucose and fructose was 5.82 and 5. 14 g/l respectively. The sucrose, glucose, and fructose consumption completely utilized at 56, 68, and 104 hours, respectively. Kinetic parameter for maximum .specific growth rate in glucose, fructose and sucrose is 0.103, 0.0448, and 0.0398 (h-1), respectively. The saturation constant is 2.13, 2.67, and 3.32 g/1.   Key Words: Kinetic Study, Sugars, Lactic Acid, Maximum Specific Growth Rate and Saturation Constant
Co-Authors A Abdullah A Abdurrakhman Abdullah Abdullah Achmad Roesyadi Achmad Roesyadi Achmad Wildan ADE ARTA, MOCHAMAD ZAINUDIN Adi Darmawan Adit Rizky Wicaksono Afriani, Nurfika Agus Suprihanto Ahmad Juanda Ahmad Ni’matullah, Albaari Aini, Apsari Puspita Aji Baharsyah Aji Prasetyaningrum Aji, Satriyo Akbar Asfar, A.M. Iqbal Al-Baari, Ahmad N Al-Baarri, Ahmad Ni'matullah Al-Baarri, Ahmad Ni’matullah Alfareza, Muhammad Ircham Almaas Salwa, Diah Ayu Andi Friadi Andika Pradifan Andrew Bryano Kermite, Andrew Bryano Andri Cahyo Kumoro Andri Cahyo Kumoro Andrianto, Novian Andry Anggoro Arahim Anggra Widhi Anggra Widhi Anik Sarminingsih, Anik Annisa Metantya Maharani Ari Eko Prasetyo Ari Eko Prasetyo Ariadi, Ariadi Arianti Nuur Annisa Arief Budiman Aris Triwiyatno Arwan, Berriandi Aulia, Haris Nu’man B Budiyono Bacthiar, Hafni Bagus Agang Sudrajat Bakti Jos Bambang Cahyono Banowati, Tria Nita Berkah Fajar Tamtomo kiono Bernike Vemmialia Jonfita Budi Warsito Budianto, Irawan Arief Catur Pramono D. Ingrid A D. Soetrisnanto Dani Puji Utomo Danny Soetrisnanto DENNY SANJAYA Devina Ingrid A. Dita Ayu Sofiati Driastuti, Faradilla Dyah Hesti Wardhani Edward, Leonardo Ela, Hulasoh Elijah Syarief Elysia, Alvina Enda Merizki br Ginting Fauzandy Husna Setyanto Ferdy D, Erbert H Hadiyanto H M Rachimoellah H Satriadi H. Satriadi H. Satriadi Hadiyanto Hadiyanto Hanapi bin Mat Hanapi bin Mat Handung Nuryadi Hanifa Zakiyatul Urbach Hantoro Satriadi Hantoro Satriadi Hantoro Satriado Haris Nu'man Aulia Haris Nu’man Aulia Hasanah, Alfi Hendra Try Ardianto Hendro, Andika Heru Susanto Hesti Rahayu I. Hartati Ika Windrianto K. Handono Indah Hartati Iqbal Mubarak Irawan Arif Budianto Irayani, Indah Jafron Wasiq Hidayat Johnner P Sitompul Khoirun Nisa Kurdianto Kurdianto Kurnia, Atik Kusdiantini, Endang Kusmiyati, K Lukman Hakim Firdaus Luqman Buchori Luqman Buchori M. Djaeni M. Hadi M. Hadi M. Hadi Makrufah Hidayah I Marcelinus Christwardana Maria Siahaan Marta Chandra Anikke Putri Masyhad Masyhad Meiny Suzery Melati, Emilla Mhd. Adithia Perdana Arman Mochamad Arief Budihardjo MSK. Tony Suryo Utomo Muchammad Muchammad Muhammad Farizan Praevia Muhammad Hilmazar Hawari Muhammad Rachimoellah Muhammad Rachimoellah Muhammad Syukri Hasan Muhammad Syukri Hasan Nabilla Salma Listyawijayanti Nasir, Yahya Ndaru Okvitarini Ngadiwiyana M.Si. S.Si. Ngurah Widiantara Ni'matuzahroh Ni'matuzahroh Novianti, Khusnul Rofida Noviyanto, Sigit Nur Rokhati Nurjannah, Rifa Nurul Yaqin Pandapotan, Boris Poltak Prakoso, Satrio Budi Prasetyo, Ahmad Wisnu Pratomo, Shendy Eko Priyosetyoko Priyosetyoko, Priyosetyoko Puja Chrisdianto Manapa Putri, Sylvia Rahmi Rahmania, Yusi Luluk Ratnawati Ratnawati Razak, Habibie Riky Yonas Riky Yonas Riva Amrulloh Roz, Kenny S Suherman S Supriyandi Samudra, Makitta Widi Saudale, Jeanette Mutiara Paula Sekarningtyas, Nazifa Seno, Abdi Setia Budi Sasongko Setia Budi Sasongko Setiadi, Muhammad Irfan Sianturi, Aurelia Genesya Silviana Silviana Silviana, S Siti Nur Khairunisa Aroli Sri Nastiti Andharini Sri Puji Lestari Sri Widodo Agung Suedi Sriatun Sriatun Striadi, H. Sugiyanto - Sulardjaka Sulardjaka Sulardjaka Sulardjaka Sulardjaka, S Sulastri, Cucu Sumiati Sumiati Suroso Agus Saputro Sussatrio, Hardito Syafrudin Syafrudin Syaiful . Sylvia Rahmi Putri Tatang H. Soerawidjaja Taufiq, Akbar Teguh Purnomo, Teguh Tri Winarni Agustini Tri Winarni, Agustini Tutuk Djoko Kusworo Uray Irzandi Uray Irzandi Utama, Bobby Indra Vicky Ramadhani, Vicky widodo, anton sri Wira Pinem Yanuar Rifianto YS Darmanto Yudhy Dharmawan Yuliani, Kristina Wulan Yulita Arni Priastiwi Yuliyandjaja, John Philia Yusi Luluk, Rahmania