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All Journal EKSAKTA: Journal of Sciences and Data Analysis Majalah Ilmiah Peternakan Reaktor International Journal of Renewable Energy Development Jurnal Ilmu Lingkungan Jurnal Kesehatan Masyarakat Abdimas Jurnal Kompetensi Teknik Jurnal Bahan Alam Terbarukan Lembaran Ilmu Kependidikan Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran Sainteknol : Jurnal Sains dan Teknologi Eksergi: Chemical Engineering Journal JURNAL INTEGRASI PROSES IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Journal of Economic Education Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Journal Of Chemical Process Engineering (JCPE) Indonesian Journal of Chemistry Journal of Teaching and Learning in Elementary Education Jurnal Pascapanen dan Bioteknologi Kelautan dan Perikanan AMALIAH: JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Ternak ASEAN Journal of Chemical Engineering Jurnal Pembelajaran Pemberdayaan Masyarakat (JP2M) Jurnal Pengabdian Masyarakat Khatulistiwa Jurnal At-Taghyir : Jurnal Dakwah dan Pengembangan Masyarakat Desa REACTOR : Journal of Research On Chemistry And Engineering Cokroaminoto Journal of Primary Education International Journal of Research Innovation and Entrepreneurship Prosiding Seminar Nasional Pengabdian Kepada Masyarakat International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Journal Of Chemical Process Engineering JURNAL REKAYASA KIMIA & LINGKUNGAN Journal of Vocational and Career Education Sainteknol : Jurnal Sains dan Teknologi Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran Jurnal Panjar : Pengabdian Bidang Pembelajaran
Wara Dyah Pita Rengga
Chemical Engineering Department, Fakultas Teknik, Universitas Negeri Semarang, Kampus Sekaran Gunung Pati, Semarang 50229, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Public Health Social Sciences Veterinary Other

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COMMUNITY EMPOWERMENT TO PURIFY USED COOKING OIL FROM ACTIVE CARBON BANANA PEELS IN PAKINTELAN VILLAGE Gustaman, Fulia Aji; Putri, Radenrara Dewi Artanti; Rengga, Wara Dyah Pita; Damarjati, Haris; Sukma, Irawan
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.26560

Abstract

Conditions The people of the Pakintelan area in village locations have a livelihood of selling cat rice, meatballs, and selling fried food. The repeated use of used cooking oil for frying is damaging human health to cause cancer. The availability of banana peel waste can be found at fried food sellers. This activity aims to increase the cooking oil user community's understanding and purify cooking oil by adsorption of activated carbon, and it can be reused. Increase public knowledge that banana peels can activate charcoal as a cooking oil purifier in the adsorber column. The method used is the socialization and education of conservation on the manufacture of activated carbon and the adsorption of cooking oil with a specific acid number. The results are by SNI and can be reused. Checking the results of purification and evaluation is carried out. Understanding the population using new cooking oil at week 4 reaches 83% of the samples tested. Cooking oil that is used at least five times is adsorbed with an acid number of 0.6. Products can benefit people's health, reduce cooking oil spending and increase knowledge and skills in purifying used cooking oil.
Synthesis and Characterization of Graphene Using Coconut Shell Charcoal Sholehah, Amalia; Vinanza, Naufal Eka; Huda, Nurul; Rengga, Wara Dyah Pita
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 1 (2020): July
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i1.22952

Abstract

Coconut shell waste has great potential as a source of carbon in the future. Graphite is one of the carbon allotropes with layers of planar layered carbon atoms. One layer of graphite is called graphene with hexagonal carbon atomic structure. In this study, the Hummers method was used to obtain graphene from coconut shell waste. This method breaks the bonding graphite layer into graphene by utilizing the process of mixing a mixture of graphite and HCl solution with the addition of KMnO4 and NaNO3. Raman Spectroscopy characterization shows the formation of multilayer graphene with D, G, and 2D values in 1365, 1585, and 2865 cm-1. The Fourier Transform Infrared Spectroscopy characterization confirmed the bonds of C-O, C = C and C = O at 1220, 1580, and 1700 cm-1. Meanwhile, X-Ray Diffraction characterization showed a peak of diffraction of graphene at 2θ at 11.6o; 23.9o; and 43.5o. The graphene produced becomes more transparent with the length of time of stirring, and the smaller the size of the graphite particles results in the irregularity of the graphene crystal structure.
PENINGKATAN KESEJAHTERAAN PENGRAJIN MINYAK CENGKEH DENGAN MENINGKATKAN KUALITAS PRODUK Handayani, Prima Astuti; Rengga, Wara Dyah Pita; Widayat, Widi
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 11, No 1 (2013): Juli 2013
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v11i1.10331

Abstract

Teknik penyulingan yang dilakukan pengrajin minyak cengkeh di Kecamatan Ungaran Barat belum baik sehingga minyak atsiri yang dihasilkan masih berkualitas crude. Minyak yang dihasilkan terlihat gelap dan berwarna kehitaman sedikit kehijauan akibat kontaminasi logam Fe dan Cu, yang akan berpengaruh terhadap sifat fisika kimia minyak. Adanya bahan-bahan asing akan merusak mutu minyak atsiri, yang menyebabkan harga jual minyak cengkeh turun. Permasalahan yang ada adalah kualitas produk berwarna kehitaman sehingga diperlukan teknik pemurnian untuk menghasilkan minyak cengkeh murni serta pengetahuan pengrajin minyak cengkeh perlu ditingkatkan mengenai teknik pengolahan minyak cengkeh. Tujuan spesifik kegiatan Ipteks bagi Masyarakat ini adalah pengrajin minyak cengkeh dapat memproduksi minyak cengkeh dengan kualitas murni (purified) melalui perbaikan dari alat suling yang digunakan dan melalui pemurnian minyak cengkeh dengan metode adsorbsi. Sehingga dapat meningkatkan pendapatan keluarga melalui peningkatan nilai jual dari minyak cengkeh yang dihasilkan. Hasil dari kegiatan ini menunjukkan pengrajin minyak cengkeh dapat memproduksi minyak cengkeh murni (purified) melalui teknik penyulingan yang benar dan melalui proses pemurnian dengan metode adsorbsi. Perlu dilakukan inovasi dan kreativitas bahan atsiri yang akan disuling sehingga akan meningkatkan produktivitas.
Konservasi Kotoran Sapi untuk Mendukung Desa Wisata Dyah Pita Rengga, Wara; Wulansarie, Ria; Wijayatim, Nanik; Tunggul Pawenang, Eram
Jurnal Abdimas Vol 23, No 1 (2019): June 2019
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/abdimas.v23i1.11979

Abstract

In Nongkosawit village, district Gunungpati, Semarang, the availability of livestock are very abundant in the presence of 60 cows. Cowshed has been allocated respectively integrated with cattle owners in accordance with its cows. The work program carried out by Tim IbM is the extension of energy conservation from cow manure into biogas energy and fertilizer plants, an environmental sanitation in the cowshed construction of biogas digester installation and provision of water pumps and packing of organic fertilizer in the tourist village. Biogas energy can be used for lighting and cooking while its by-products can be used as fertilizer. Gain on sale of fertilizers is four times the price than cow dung. The fertilizer contains elements N, P, and K atoms that can nourish plants in sufficient quantities.
Optimization of Terpenoid Extraction from Bay (Syzygium polyanthum) Leaves using Ethanol as a Solvent by an Ultrasonic Wave Technology Kusumaningrum, Maharani; Prasetiawan, Haniif; Setiyorini, Nurul; Dewanti, Astiara Anis; Rengga, Wara Dyah Pita
International Journal of Research Innovation and Entrepreneurship Vol 1 No 1 (2020): June 2020
Publisher : Universitas Negeri Semarang

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

Abstract

Bay is one of the medicinal plants. Bay leaves have been used in the pharmaceutical and food industry as an antimicrobial. The chemical compounds in the leaves that served as an antimicrobial were terpenoids. This study aims to determine the optimum extraction conditions of bay leaves using a response surface methodology (RSM). Ten grams of dried and mashed bay leaves was extracted for 60 minutes using ethanol as a solvent. The extraction was conducted at various temperatures (60, 70, 80 oC) and various ratios of the starting material to solvent (1: 8, 1:10, 1:12 g/g) for 60 min. The optimum extraction condition based on the RSM results was achieved at 70 °C with a ratio of the starting material to solvent of 1:12 g/g resulting in the extract yield of 9.69%. The results of the GC-MS analysis on the obtained extracts showed that 33% of terpenoids was obtained from the extraction at the optimum condition.
Pemanfaatan Daun Sirsak (Annona Muricata): Obat Tradisional dan Lampu Hias dari Tulang Daun Rengga, Wara Dyah Pita; Eko, Sutino
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 11, No 2 (2013): Desember 2013
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v11i2.10313

Abstract

Daun Sirsak banyak ditemukan di Kelurahan Mangunsari, Semarang. Daun ini mempunyai kegunaan sebagai obat kanker. Keunggulan daun sirsak dapat meningkatkan sistem kekebalan tubuh dan menjadi suplemen antioksidan bagi kesehatan. Masyarakat belum banyak tahu tentang manfaat daun sirsak  terlebih sebagai obat tradisional dan lampu hias meja di rumah. Tujuan dari kegiatan ini adalah sosialisasi manfaat daun sirsak sebagai obat untuk kesehatan, melatih aplikatif cara membuat lampu hias dari daun sirsak. Cara pembuatan daun sirsak menjadi lampu hias adalah daun sirsak berwarna hijau tua direndam dalam air bilasan beras, selama 3-4 minggu terfermentasi sehingga daging daun bisa terlepas dan tinggal tulang daunnya. Selanjutnya tulang daun sirsak dikeringkan dirangkai dan tulang daun disusun menjadi kelopak bunga dan dilengkapi dengan fitting, bola lampu, dan kawat serta kabel. Setelah itu batang diisolatif warna hijau dan diberi daun. Beberapa rangkaian bunga dipadukan jadi satu dilengkapi saklar dan pot, sehingga menjadi lampu hias.
Synthesis and Characterization of Graphene Using Coconut Shell Charcoal Sholehah, Amalia; Vinanza, Naufal Eka; Huda, Nurul; Rengga, Wara Dyah Pita
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 1 (2020): July
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i1.22952

Abstract

Coconut shell waste has great potential as a source of carbon in the future. Graphite is one of the carbon allotropes with layers of planar layered carbon atoms. One layer of graphite is called graphene with hexagonal carbon atomic structure. In this study, the Hummers method was used to obtain graphene from coconut shell waste. This method breaks the bonding graphite layer into graphene by utilizing the process of mixing a mixture of graphite and HCl solution with the addition of KMnO4 and NaNO3. Raman Spectroscopy characterization shows the formation of multilayer graphene with D, G, and 2D values in 1365, 1585, and 2865 cm-1. The Fourier Transform Infrared Spectroscopy characterization confirmed the bonds of C-O, C = C and C = O at 1220, 1580, and 1700 cm-1. Meanwhile, X-Ray Diffraction characterization showed a peak of diffraction of graphene at 2θ at 11.6o; 23.9o; and 43.5o. The graphene produced becomes more transparent with the length of time of stirring, and the smaller the size of the graphite particles results in the irregularity of the graphene crystal structure.
PENINGKATAN KESEJAHTERAAN PENGRAJIN MINYAK CENGKEH DENGAN MENINGKATKAN KUALITAS PRODUK Handayani, Prima Astuti; Rengga, Wara Dyah Pita; Widayat, Widi
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 11, No 1 (2013): Juli 2013
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v11i1.10331

Abstract

Teknik penyulingan yang dilakukan pengrajin minyak cengkeh di Kecamatan Ungaran Barat belum baik sehingga minyak atsiri yang dihasilkan masih berkualitas crude. Minyak yang dihasilkan terlihat gelap dan berwarna kehitaman sedikit kehijauan akibat kontaminasi logam Fe dan Cu, yang akan berpengaruh terhadap sifat fisika kimia minyak. Adanya bahan-bahan asing akan merusak mutu minyak atsiri, yang menyebabkan harga jual minyak cengkeh turun. Permasalahan yang ada adalah kualitas produk berwarna kehitaman sehingga diperlukan teknik pemurnian untuk menghasilkan minyak cengkeh murni serta pengetahuan pengrajin minyak cengkeh perlu ditingkatkan mengenai teknik pengolahan minyak cengkeh. Tujuan spesifik kegiatan Ipteks bagi Masyarakat ini adalah pengrajin minyak cengkeh dapat memproduksi minyak cengkeh dengan kualitas murni (purified) melalui perbaikan dari alat suling yang digunakan dan melalui pemurnian minyak cengkeh dengan metode adsorbsi. Sehingga dapat meningkatkan pendapatan keluarga melalui peningkatan nilai jual dari minyak cengkeh yang dihasilkan. Hasil dari kegiatan ini menunjukkan pengrajin minyak cengkeh dapat memproduksi minyak cengkeh murni (purified) melalui teknik penyulingan yang benar dan melalui proses pemurnian dengan metode adsorbsi. Perlu dilakukan inovasi dan kreativitas bahan atsiri yang akan disuling sehingga akan meningkatkan produktivitas.
COMMUNITY EMPOWERMENT TO PURIFY USED COOKING OIL FROM ACTIVE CARBON BANANA PEELS IN PAKINTELAN VILLAGE Gustaman, Fulia Aji; Putri, Radenrara Dewi Artanti; Rengga, Wara Dyah Pita; Damarjati, Haris; Sukma, Irawan
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.26560

Abstract

Conditions The people of the Pakintelan area in village locations have a livelihood of selling cat rice, meatballs, and selling fried food. The repeated use of used cooking oil for frying is damaging human health to cause cancer. The availability of banana peel waste can be found at fried food sellers. This activity aims to increase the cooking oil user community's understanding and purify cooking oil by adsorption of activated carbon, and it can be reused. Increase public knowledge that banana peels can activate charcoal as a cooking oil purifier in the adsorber column. The method used is the socialization and education of conservation on the manufacture of activated carbon and the adsorption of cooking oil with a specific acid number. The results are by SNI and can be reused. Checking the results of purification and evaluation is carried out. Understanding the population using new cooking oil at week 4 reaches 83% of the samples tested. Cooking oil that is used at least five times is adsorbed with an acid number of 0.6. Products can benefit people's health, reduce cooking oil spending and increase knowledge and skills in purifying used cooking oil.
Adsorption Studies of Rice Husk-Based Silica/Carbon Composite Wara Dyah Pita Rengga; Wahyudi Budi Sediawan; Nadya Alfa Cahaya Imani; Harianingsih Harianingsih; Kega Amalania Salsabiil
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 1, ISSUE 2, August 2020
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol1.iss2.art1

Abstract

Rice husk as a by-product of the rice milling process is a material that can still be processed to be a product that can be used in various applications. The potential for the commercialization ofrice husks is still hampered by its low economic value. By using the heating method using an inert gas, rice husk can be converted into a composite which contains mostly silica and carbon, a wellknown component with excellent adsorbent properties. This aimed to study the preparation of rice husk-baased silica/carbon composite and its adsorption behavior. In this research, the utilization of rice husk into silica/carbon composites was done by using three different methods. Common heating under temperature of 800 oC, heating process under temperature of 800 oC using furnace equipped with inert gas, and heating process under temperature of 800 oC using furnace equipped with inert gas with addition of glucose solution were carried out in order to obtain three different kinds of composite. Analysis and characterization using were performed to observe the properties of the composites. As the result, from Fourier Transform Infra-Red and X-Ray diffraction characterizations, silica/carbon composites were successfully made as both of carbon and amorphous silica spectra appeared in the result. Furthermore, composite made under temperature of 800 oC using furnace equipped with inert gas with addition of glucose solution has the highest adsorption capacity and Langmuir’s model adsorptive behavior with R2 value of 0.935.
Co-Authors Achmad Chafidz Agung Feinnudin Agung Feinnudin AGUS PURWANTO Agustin, Eny Widhia Ajeng, Asriningtyas Akhmad Sutrisno Aldias Bahatmaka Alifyan Syauqi Amalia Sholehah, Amalia Amir Mahmud Andrian Satria Oktafandy4 Angga Pratama Anne Zulfia Anwaruddin Hisyam Apriliani, Enni Ardianto, Dwi Wahyu Ardik Erwanto Arie Yufitasari, Arie Ashar Shidqi Asnafi, Agus Asriningtyas Ajeng Athiya Rihadatul 'Aisy Qothrun Nada Bahlawan, Zuhriyan Ash Shiddieqy Bayu Tri Wibowo Bayu Triwibowo Budi Cahyono Budi Cahyono Cahyarini, Nindy Septian Cantika, Citra Cahya Cepi Kurniawan Chafidz, Achmad Damarjati, Haris Dani Muhtada Daniel Setiyo Nugroho Dewanti, Astiara Anis Dewi Selvia Fardhyanti Dewi Trisnani Dhimas Setiawan Dhoni Hartanto Dino Alfian, Rangga Diyah Ayu Utami, Kiki Duhita Driyah Suprapti Dwi - Hartanto Dwi Wahyu Ardianto Eko Nurjanah, Eko Eko Setyawan Eko, Sutino Ella Kusumastuti, Ella Erika Wijayanti Ernawati, Rosidah Erlis Erwanto, Ardik F Widhi Mahatmanti Fardhyanti , Dewi Selvia Fulia Aji Gustaman, Fulia Aji Godham Eko Saputro Handoko, Pratama Senapati Bagus Haniif Prasetiawan Hapsari, Widya Prita Harianingsih Harianingsih, Harianingsih Harianingsih, Harianingsih Hartoyo, Adhita Meizaldi Hibatullah, Ridwan Dani Hidayah, Fauziyah Nurul Hidayah, Uswatun Nur Ichwan, Rizky Ihsani, Ade Nurul Imani, Nadya Alfa Cahaya Irawan Sukma, Irawan Irawaty Irawaty Irene Nindita Pradnya Izza Arinanda, Miftakhul Jumari, Arif Juniawan, Eko Rahmad Karnowo - Kega Amalania Salsabiil Khosiatun Khosiatun Laksana, Mochamad Brian Latifah Latifah Lilis Hartati M Nasikin M Nasikin M. Sudibandriyo M. Sudibandriyo Maghfiroh, Anik Maharani Kusumaningrum Maharani Rani Maheswari, Asiyah Dita MALIKHANA, A. Mardita, Meza Maulana, Dea Maulida Zakia Mellysa Wandasari Miftakhul Izza Arinanda Mohammad Setiawan Mubarok, Muhammad Afnan Muhammad Arsa A D Muhammad Fajrul Rohman Muhammad Rozaq Muna, Laili Nailil Nabil, Nisrina Hasna' Nada, Athiya Rihadatul ‘Aisy Qothrun Nadya Alfa Cahaya Imani Nanggala, Pragusti Lintang Adhi Nanik Wijayati Natalia Desy Putriningtyas, Natalia Desy Nelson Saksono Nirwan Syarif Nur Qudus Nurazizah, Nilasari Nurdian Susilowati Nurjanah, Eko Nurul Huda Pandhu Putratama Pangestu, Indra Sakti Prasetiawan , Haniif Prasetya , Agung Tri PRASETYO, R. Prayoga, Ade Bintang Prima Astuti Hand, Prima Astuti Prima Astuti Handayani Putratama, Pandhu Radenrara Dewi Artanti Putri, Radenrara Dewi Artanti Rahmah, Ladunia Rahmalia, Berliana Putri Ratna Dewi Kusumaningtyas RAYDITYA, R. Retno Wulandari Ria Wulansarie Ria Wulansarie, Ria Ridwan Dani Hibatullah Risanti, Tiara Bunga Rizki Ria Ramadhani Rosidah Erlis Ernawati Rusiyanto Rusiyanto Rusiyanto, Rusiyanto S. Anis, S. Salsabila , Vira Hanisa Santi Wijayanti, Dwi Gansar Saputra, Danang Dwi Septiningsih, Tri Setijo Bismo Setiyorini, Nurul Setyawan, Eko Shakin Ervita Oktaviyani Shidqi, Ashar Shochifah Diyah Puspitasari Siami, Desy Hikmatul Sri Haryani Sri Kadarwati Sri Kadarwati Sri Roikah, Sri Sri Susilogati Sucihatiningsih Dian Wisika Prajanti Suharyo - Sunyoto Sunyoto Suryani, Parsy Wulan Syabaniah, Nyimas Febrika Tiara Khalifah Permani Triwibowo , Bayu Tunggul Pawenang, Eram Tunggul Pawenang, Eram Ulfah Mediaty Arief Vinanza, Naufal Eka Wahyudi Budi Sediawan Wahyudi Wahyudi Waliyuddin Sammadikun Wati, Safna Rahma Widhi Mahatmanti Widi Widayat Widiastuti, Amelia Putri Widya Hary Cahyati Widya Prita Hapsari Wijayatim, Nanik Wismoyo Adi, Wismoyo yoga agung prabowo Yoris Adi Maretta Yudha, Cornelius Satria Zakaria, Zainal