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All Journal Jurnal Ilmiah Widya PENELITIAN DAN KARYA ILMIAH JOURNAL OF EARTH ENERGY ENGINEERING Agroindustrial Technology Journal Jurnal Teknik Barometer Jurnal Fisika : Fisika Sains dan Aplikasinya Jurnal Sains dan Edukasi Sains Jurnal Sains Teknologi dalam Pemberdayaan Masyarakat Jurnal Jaring SainTek JURNAL PENELITIAN DAN KARYA ILMIAH LEMBAGA PENELITIAN UNIVERSITAS TRISAKTI Bhara Petro Energi Journal of Engineering Environtmental Energy and Science International Journal of Advanced Multidisciplinary Jurnal Penelitian dan Karya Ilmiah Lembaga Penelitian Universitas Trisakti Journal of Biopesticides and Agriculture Technology Energy Justice
Widodo, Hernowo
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Analisis Perhitungan Asam Klorida (HCl) Sebagai Pengontrol pH pada Air Cooling Tower pada Pabrik Pembangkit Listrik Tenaga Sampah (PLTSa) Hernowo Widodo; Rino Dwiatmaja
Jurnal Bhara Petro Energi Vol.1 No.2 (November 2022)
Publisher : Fakultas Teknik Universitas Bhayangkara Jakarta Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31599/26fznf34

Abstract

The Garbage Power Plant (PLTSa) has a water cycle in which heat transfer occurs in the cooling tower. This study looked for the pH level of the hot ratio using samples from hydrochloric acid (HCl) tanks and cooling tower (CT) output water samples. The results obtained by several comparisons of testing and analysis were obtained by 3.6 Liters of adding hydrochloric acid (HCl) to the tank so that the heat transfer that runs on the cooling tower has a pH level of 7. If the pH level is already 7 the possibility for acids or bases to be small and can preventing and maintaining heat transfer flows.process.
Development of Coconut Oil Fermentation MethodS (Cocos Nucifera) Using Rhizopus SP Microbe Wulandari, Retno; Hernowo Widodo
International Journal of Advanced Multidisciplinary Vol. 1 No. 1 (2022): International Journal of Advanced Multidisciplinary (April-June 2022)
Publisher : Green Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (231.62 KB) | DOI: 10.38035/ijam.v1i1.23

Abstract

Generally, the manufacture of coconut oil still uses high temperatures so it requires a lot of energy or fuel. In this study, the manufacture of coconut oil was developed using the help of Rhizopus sp microbes with the fermentation method. The aim is to save fuel, little residue, low rancidity level, fragrant aroma, free of cholesterol-inducing compounds and to study the effect of microbial weight, fermentation time. The results obtained from the organoleptic test of coconut oil produced a savory taste, fragrant aroma and clear color, in accordance with SNI 7381:2008. The results of the chemical analysis test were pH 4, the free fatty acid value was 0.15%, the peroxide number was 2.97 mekO2/Kg and the saponification number was 246 MgKOH/gr in accordance with SNI 01-2902-1992. Then the microbial test was found Kapang of 1 and Khamar of < 1, in accordance with the standard SNI ISO 2157-1 (BPOM).
Pengaruh Penambahan Ekstrak Daun Mangga ( Mangifera indica L.) Terhadap Sifat Fisik Sampo Anti Ketombe Mardiana; Widodo, Hernowo; Dewi Nolisa, Winda
Journal of Engineering Environtmental Energy and Science Vol. 2 No. 1 (2023): January 2023
Publisher : LPPMP Universitas Bhayangkara Jakarta Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31599/jkwv6694

Abstract

Candida albicans adalah salah satu jamur yang dapat menyebabkan infeksi candidiasis. Infeksi yang disebabkan oleh Candida dikenal dengan Candidiasis. Salah satu obat alami dari ekstrak tanaman yang berpotensi sebagai antijamur adalah ekstrak daun mangga (Mangifera indica L.). Penelitian ini bertujuan untuk mengetahui penambahan ekstrak daun mangga (Mangifera indica L.) terhadap sifat fisik shampo anti ketombe. Daun mangga diekstraksi secara maserasi menggunakan pelarut etanol 70%, kemudian dilanjutkan pembuatan shampo Setelah itu tambahkan ekstrak daun mangga (Mangifera indica L.) dan aduk ad homogen. Pada penelitian ini menggunakan 3 formula shampo, dengan variasi konsentrasi ekstrak daun mangga sebesar 0%, 1% dan 2%. Uji sifat fisik sediaan meliputi pengukuran pH, uji tinggi busa, uji viskositas, uji mikrobiologi dan uji fungi. Pengaruh pH dan tinggi busa menunjukkan semakin tinggi konsentrasi ekstrak maka pH bersifat asam, dan pada tinggi busa mempengaruhi stabilitas busa shampo. Pengaruh mikrobiologi menunjukkan dengan penambahan ekstrak semakin sedikit mikrobiologi yang tumbuh dan tidak ada fungi. Dari hasil pengujian didapatkan F1 (2%) ph 6,33, tinggi busa 13,5 cm, viskositas 2658 cp, hasil uji mikrobiologi dan uji fungi menujukkan penambahan ekstrak daun mangga dapat mengurangi pertumbuhan jamur.
Ekstraksi dan uji aktivitas antioksidan ekstrak etanol batang bintangur (calophyllum soulattri) Fatimah, Siti; Widodo, Hernowo; Kustiyah, Elvi
Journal of Biopesticides and Agriculture Technology Vol. 1 No. 2: (Agustus) 2024
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/jbiogritech.v1i2.2024.1184

Abstract

Background: Cigarette smoke, fried and grilled foods, excessive exposure to sunlight, motor vehicle fumes, certain drugs, toxins and air pollution are some sources of free radical compounds. As a result of homolytic breakdown, a molecule will break down into free radicals that have unpaired electrons. Electrons need a partner to balance their spin value, so that radical molecules become unstable and easily react with other molecules, forming new radicals. Findings: To prevent or reduce chronic diseases due to free radicals, antioxidants are needed. Antioxidants can slow down or inhibit the oxidation of substances that are easily oxidized even in low concentrations. Antioxidants can neutralize free radicals by donating one proton atom, making free radicals stable and non-reactive. Methods: Extraction is carried out by the maceration method, which is to soak the simplicia with ethanol solvent. This maceration process is carried out for 24 hours, then the solution containing the extract is filtered using filter paper. This maceration process is carried out three times. Conclusion: Ethanol extract of bintangur stem has quite high antioxidant activity, this can be proven by the IC50 value obtained of 3.05 ppm, this value is almost close to the IC50 value of vitamin C, which is 2.9 ppm, and by the appearance of spots in the Thin Layer Chromatography test.
Sintesis dan Karakterisasi Nanopartikel TiO2, Al, dan Zn dengan Metode Hydrothermal Samsuri, M; Widodo, Hernowo; Wulandari, Retno; Putra, Erlambang Yogaswara Gusti; Farida, Inul Lestari; Ramadhania, Vika Shalsa; Priyatna, Eddy Nana
Jurnal Sains dan Edukasi Sains Vol. 8 No. 1 (2025): Jurnal Sains dan Edukasi Sains
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/juses.v8i1p1-6

Abstract

Penelitian ini dilakukan sintesis nanopartikel menggunakan metode hydrothermal. Metode hydrothermal adalah proses pembentukan material dengan penggunaan air pada suhu rendah dan tekanan tinggi untuk merubah struktur kristal dan membentuk material nano-struktur. Penelitian ini bertujuan untuk mengetahui morfologi permukaan karakteristik nanopartikel TiO2, Al, dan Zn yang disintesis menggunakan metode hydrothermal.  Sejumlah senyawa Co(NO3)2.6H2O dan Ni(NO3)2.6H2O digunakan pada penelitian ini. Setelah tahap dispersi sampel akan dimasukan ke dalam reaktor autoclave. Penelitian ini dilakukan dengan metode hydrothermal yaitu dengan pemanasan tinggi dengan suhu 150 ℃ dalam waktu 24 jam. Selanjutnya sampel akan dikarakterisasi dengan metode pengujian SEM untuk mengetahui morfologi permukaan nanopartikel. Hasil pengujian SEM sampel TiO2 memiliki bentuk seperti bongkahan yang tidak teratur dan memiliki ukuran yang cukup bervariasi. Pengujian SEM sampel nanopartikel Al menunjukan bentuk yang teratur serta berukuran kecil. Morfologi nanopartikel Zn memiliki bentuk yang sangat kecil dan halus terdapat beberapa partikel yang memiliki ukuran lebih besar dan kurang teratur. Dengan salah satu yang dapat disimpulkan Nanopartikel TiO2, Al, dan Zn, berhasil disintesis dengan metode hydrothermal dan menggunakan Zn(NO3)2.6H2O, Al(NO3)3.9H2O, serta TiO2  sebagai bahan baku dan terjadinya perubahan warna pada sampel pada setiap tahap yang dilakukan. Sampel memiliki warna yang beragam sehingga pada tahap awal menjadi larutan berwarna kuning pekat dan setelah menjadi nanopartikel menjadi hitam.
Pembentukan hidrogen dari koh menggunakan katalis aluminium foil dari limbah bungkus rokok Safitry, Deska Eka; Widodo, Hernowo
Energy Justice Vol. 1 No. 2: (Agustus) 2024
Publisher : Institute for Advanced Social, Science, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/enjust.v1i2.2024.1187

Abstract

Background: As we know, at this time the State of Indonesia is experiencing an energy crisis due to the increasing number of population which has a direct effect on fuel consumption. Hydrogen is very likely to be an alternative fuel for the future. Findings: The hydrogen production process can be carried out biologically or chemically. Chemical production of hydrogen is to use alkaline aluminum to be used as an alkaline aluminum fuel cell. An alkaline-air aluminum fuel cell is a series of aluminum anodes in an alkaline solution and oxygen gas in the cathode that will produce electrical energy. Methods: This research tries to utilize aluminum foil waste (Cigarette Wrapper) as a source of aluminum for hydrogen production. For this reason, research into the production of hydrogen gas from aluminum foil waste using a KOH catalyst. Hydrogenation is done by the process of Hydrognation with temperatures of 25 ° C, 30 ° C, and 40 ° C, with the activator used is Potassium Hydroxide with concentrations of 1M, 2M, 3M, and 4M. Conclusion: The results showed that at 25 ° C with a concentration of 1M there was a volume weight of 286.04 ml. The 2M concentration contained a volume weight of 165.31. 3M concentrations have a volume weight of 118.80 ml. The 4M concentration contained a volume weight of 112.90 ml. At a temperature of 30 ° C with a concentration of 1M there is a volume weight of 217.19 ml. The 2M concentration contained a volume weight of 271.22 ml. 3M concentration contained a volume weight of 273.48 ml. 4M concentration was 272.79 ml. At 40 ° C with a concentration of 1M there is a volume weight of 927 ml. The 2M concentration contained a volume weight of 640.9 ml. 3M concentration contained a volume weight of 453.6 ml. and the 4M concentration contained a volume weight of 299.7 ml. The best results are shown in KOH Activator temperature 40 ° C with a volume weight of 299.7 ml and a concentration of 4M.
Katalis bimetalk CuCo/AI203 dalam reaksi hidrolisis sodium borohydride sebagai reaksi penghasil hidrogen Husna, Huriyatul; Widodo, Hernowo
Energy Justice Vol. 1 No. 2: (Agustus) 2024
Publisher : Institute for Advanced Social, Science, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/enjust.v1i2.2024.1191

Abstract

Background: Sodium Borohydrida is an inorganic compound with the chemical formula NaBH4, this compound is soluble in alcohol and some ether has not been added to air into hydrogen gas containing a catalyst. Findings: In this way it can be produced safely for fuel cells. Methods: Producing catalytically H2 from solution, NaBH4 has gained many advantages, NaBH4 is not flammable, environmentally friendly reaction products, the rate of generation of H2 is easily controlled, H2 can be produced at low temperatures. Conclusion: The catalyst used in the hydrolysis of sodium borohydride is Cu and Co which acts as a heterogeneous catalyst. The limited surface area of heterogeneous catalysts causes lower catalytic activity because catalyst activity is directly related to its surface area. Thus, the use of Cu and Co with large surfaces provides a potential route for increasing catalytic activity. For this reason, we use CuCo / Al2O3 as a catalyst in the hydrolysis of sodium borohydride.
Co-Authors Ahmad Fauzi Ahmad Fauzi Amaliah Annisa Amaliah Annisa Ananda Siti Choirunnisa Andhy Andhy Annisa, Amaliah Bungaran Saing, Bungaran Cecep Kusmana Dewi Nolisa, Winda Eka Fhauziah Elvi Kustiyah Elvi Kustiyah Elvi Kustiyah, Elvi Everlita Sabrina Everlita Sabrina Farida, Inul Lestari Fhauziah, Eka Husna, Huriyatul Ilham Santoso Ismaniah Ismaniah Joniwarta Laras Andria Wardani Laras Andria Wardani Laras Andria Wardani Lisa Adhani Lisa Adhani lisa adhani M Samsuri M Samsuri, M M. Samsuri Maesaroh, Elsa Mardiana MARDIANA Maria Ulfah Mohamad Prastya Mohamad Prastya Mohammad Riyadi Setyarto Piti, Viriya Priyatna, Eddy Nana Putra, Erlambang Yogaswara Gusti Ramadhania, Vika Shalsa Rehab Laila Retno Wulandari Rino Dwiatmaja Rino Dwiatmaja Safitry, Deska Eka Samsul Ma’rif Santoso, Ilham Siswanto, Budiarto Djono Siti Fatimah Siti Setiawati Solihatun Solihatun Vicky Anderesta Kuswoyo Viriya Piti Widyantoro, Murwan Winda Dewi Nolisa Yustinus Trihusodo