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All Journal Reaktor International Journal of Renewable Energy Development TEKNIK METANA JURNAL KIMIA SAINS DAN APLIKASI JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Kimia dan Kemasan Majalah Ilmiah MOMENTUM ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Jurnal Inovasi Teknik Kimia Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Jurnal Teknik Kimia Indonesia Jurnal Kimia dan Kemasan Jurnal Pengabdian Vokasi Jurnal Profesi Insinyur Indonesia International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis

Aprilina Purbasari

Departemen Teknik Kimia, Fakultas Teknik, Universitas Diponegoro

Author-ID : 348885

Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Transportation

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PEMBUATAN NATA BERBAHAN DASAR ALANG-ALANG SECARA FERMENTASI SEBAGAI KAJIAN AWAL PEMBUATAN EDIBLE FILM Agnesia Permatasari; Hafsah Fajrin Aprilianti; Aprilina Purbasari
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 1, Nomor 1, Tahun 2012
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

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Nata is a kind of food fermented by Acetobacter xylinum bacteria, which is forming a gel which floats on the surface of the media or places that contain sugar. Reed plants contain glucose ± 6.8% so it can be used nata. Nata can be harnessed into goods that have a higher economic value, among which are the edible film. Purpose of this study was to determine the effect of concentration of the added starter (Acetobacter xylinum) and influence the level of acidity (pH) in the process of making nata, furthermore nata can be used for manufacture of edible film. Major in this prosedur there are two steps, first fermentation nata and the second is the manufacture of edible main film. Variable in this study are the variation of pH of 3, 4 and 5 and starter concentration of 10%, 20% and 30%. Optimal result from this study at pH 4 and concentration 30%. This means the addition of 30% of the activity of bacteria Acetobacter xylinum are on optimal conditions in which the starter to the maximum 30% sufficient for the formation of nata. From the results of experiments conducted, the resulting edible film with a thickness of 0.05 mm, tensile strength of 6.635 N/mm2, edible films can be used as food packaging materials with tensile strength values ranged from 2.89 to 27.26 N/mm2 making edible films nata produced from reeds can be used for food packaging materials.

PENGARUH PERBANDINGAN JUMLAH STARTER TERHADAP PROSES FERMENTASI WINE APEL MENGGUNAKAN NOPKOR MZ-11 Rini Kusumawati; Muhammad Adi Irawan; Aprilina Purbasari
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 2, Nomor 2, Tahun 2013
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

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Based on Department of Agriculture and Forestry Batu, Malang, in the 2010, the number of apple productions are 2,574,852 trees with productivity reaching 17 kg / tree. From all of trees only 60-70% of apples that can be harvested and sold in the market. The apple that doesn’t sell in the market, named reject apple. Until now, this apple could not be fully utilized. NOPKOR MZ 11 is multicultural is the main constituent microbes with S. Cerevicea Bolognesis that can convert sugar to alcohol, such as others S. Cerevicea. The advantages of this NOPKOR is its durability very high so it does not die easily. The main objective from this research is to determine the effect of the starter substrate ratio the growth of biomass and the resulting alcohol. The method which used are starter that added and the time of fermentation. And then from the data of refractive index result the phenomena of fermentation process. From the refractive index and using a standard curve, the data is converted. So that the refractive index is known and the amount of biomass levels of alcohol contained in the wine. Based on the research results, alcohol and optimal growth obtained in the ratio of 10% starter volume, it can able because a balanced amount of nutrients obtained by microbes thus more optimal growth and the amount of alcohol that produced is also higher. The longer of fermentation time, the amount of alcohol obtained and the number of microbes continued to increase, until the end of fermentation the increase was not too rapidly and tends to approach a constant, this is because the microbes have entered the stationary phase so that growth is not as fast as the previous phase.

PENINGKATAN KADAR EUGENOL PADA MINYAK ATSIRI CENGKEH DENGAN METODE SAPONIFIKASI-DISTILASI VAKUM Machmud Lutfi H; Wisnu Jati N; Aprilina Purbasari
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 2, Nomor 2, Tahun 2013
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

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The purpose of this research is to study the saponification and vacuum distillation process to isolate eugenol from clove essential oils and get the optimum condition from this process.Eugenol is a compound that is used in many industries, such as perfume, flavouring, pesticides and anesthetic. In this era, the clove essential oils are available in market including 70% of eugenol. But the industry needs more than 90% eugenol included. So, we need the efficience process to increase its purity. And the process we use in this research is saponification-vacuum disltilation. The experimental design used in this research is the variation of NaOH normality and the temperature operation of distilllation.The NaOH normalities are from 0,3 to 1,2 N, and the temperature operation of distilllation are 170 o, 195 o, 220o C. The procedure of this research is mixing 70% clove essential oils with NaOH . After the solution has became homogeneous, let it stand into two layers, water and Na-eugenol. Separate the organic layer, and add HCl to the Na-eugenol till the pH down into 3-4. And then separate them. The higher layer that is 80 % eugenol is entered to the distilation tube. Run the distilation process with fixed temperature and vacuum pressure (6x10-2 kPa). After distillation process we got the weightest mass of eugenol at the temperature 220o C that the mass is 33,13 grams and the percentages of the mass is 89,65%.

PEMBUATAN BIOETANOL DARI SINGKONG KARET (Manihot glaziovii) UNTUK BAHAN BAKAR KOMPOR RUMAH TANGGA SEBAGAI UPAYA MEMPERCEPAT KONVERSI MINYAK TANAH KE BAHAN BAKAR NABATI Mira Amalia Hapsari; Alice Pramashinta; Aprilina Purbasari
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 2, Nomor 2, Tahun 2013
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

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Manihot glaziovii is a tuber that non-food corps, because it contains cyanide acid (HCN) which are toxic. Carbohydrate content in cassava tubers is 98,5% so it is worth to be converted to bioethanol. Bioethanol is a product of hydrolysis of starch to glucose, followed by enzymatic fermentation of glucose using yeast Saccharomyces cereviceae to ethanol. The purpose of this study is to find the optimum time and mass effect on of yeast to produced ethanol as a fuel household stoves. The research was carried out in several stages, including the enzymatic hydrolysis of cassava starch to glucose and continued fermentation of glucose to ethanol. Bioethanol purification is done by distillation process. The main tool that used is fermentor and distillation tower as a means of separating ethanol from water. Analysis of glucose levels is done by titration using Fehling A and B, while the ethanol concentration measurements with alkoholmeter. The results showed that the optimum volume was 3 mL enzyme that produces glucose level of 18% which is good for fermentation. The results that have been achieved for the fermentation time variable 144, 168 and 192 hours earned the highest ethanol content is 94% at 168 hours fermentation time, while for variable mass 5.10 yeast, and 15 g obtained the highest ethanol content is 94% in mass yeast 15 gr.

PROSES PEMBUATAN BIODIESEL DARI DEDAK DAN METANOL DENGAN ESTERIFIKASI IN SITU Wulandari Dharsono; Y. Saptiana Oktari; Aprilina Purbasari
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 2, Nomor 2, Tahun 2013
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

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Kandungan asam lemak bebas (Free Fatty Acid (FFA)) yang tinggi menyebabkan minyak dedak padi dapat dikonversi menjadi Fatty Acid Methyl Ester (biodiesel) dengan esterifikasi. Tujuan dari penelitian ini adalah memanfaatkan dedak sebagai bahan baku pembuatan biodiesel dengan proses esterifikasi in situ serta mempelajari pengaruh jumlah solvent (metanol) dan waktu operasi dalam pembuatannya. Kandungan asam lemak bebas dalam dedak padi dapat meningkat cepat karena adanya enzim lipase aktif dalam dedak padi setelah proses penggilingan. Metode yang digunakan untuk pembuatan biodiesel pada penelitian ini adalah proses esterifikasi in situ. Di dalam proses ini, dedak dicampur dengan metanol dan katalis asam (H2SO4) di mana metanol berfungsi sebagai solvent sekaligus reaktan. Pada proses ini asam lemak bebas dapat terekstrak dari dedak dan selanjutnya bereaksi dengan metanol membentuk metyl ester (biodiesel). Variabel tetap yang digunakan adalah berat dedak 50 gram, kecepatan pengadukan dengan skala 4, jumlah katalis H2SO4 1% volume. Variabel berubahnya pada proses esterifikasi in situ adalah jumlah methanol 150, 200, 250 ml dan waktu reaksi 1;2;3;4 jam. Proses esterifikasi in situ dedak padi mampu menghasilkan biodiesel,dengan waktu operasi optimum adalah 60 menit dan penambahan jumlah methanol sebesar 200 ml menghasilkan konversi paling tinggi

PENGENALAN TEKNOLOGI PEMBUATAN KOMPOS DARI LIMBAH RUMAH TANGGA DI KELURAHAN BENDAN NGISOR KECAMATAN GAJAH MUNGKUR Dessy Ariyanti; Aprilina Purbasari; Slamet Priyanto; Purwanto Purwanto; Setia Budi Sasongko
Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Vol 3, No 3 (2021)
Publisher : Fakultas Teknik Universitas Diponegoro

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Hingga saat ini masyarakat secara luas dan warga di kelurahan Bendan Ngisor, Kecamatan Gajah Mungkur, Kota Semarang khususnya masih belum memiliki pengetahuan yang cukup mengenai sampah, terutama manfaat dari program reuse, reduce, recycle dari sampah maupun kemudahan dari penerapan metode 3R dalam kehidupan sehari-hari. Termasuk diantaranya pengetahuan mengenai kompos dari sampah rumah tangga dan teknologi pembuatannya. Kegiatan pengabdian masyarakat ini diselenggarakan untuk mendukung upaya pemerintah dalam mensosialisasikan program Reuse, Reduce and Recycle untuk mengatasi permasalahan sampah di Kota Semarang dengan memberikan pelatihan tentang pengetahuan dan keterampilan dalam mengelola secara mandiri serta memanfaatkan sampah rumah tangga terutama sampah organik menjadi kompos. Pasca pelatihan, 90% peserta mendapatkan pengetahuan tentang pembuatan kompos, dan 10% warga masyarakat mulai menerapkan teknologi pengomposan dirumahnya masing-masing.

The Effect of Alkaline Activator Types on Strength and Microstructural Properties of Geopolymer from Co-Combustion Residuals of Bamboo and Kaolin Aprilina Purbasari; Tjokorde Walmiki Samadhi; Yazid Bindar
Indonesian Journal of Chemistry Vol 18, No 3 (2018)
Publisher : Universitas Gadjah Mada

Geopolymer as a Portland cement substitute had been synthesized from alkaline activation of co-combustion residuals of bamboo and kaolin. Types of used alkaline activators were NaOH solution, KOH solution, a mixture of NaOH solution-water glass, and a mixture of KOH solution-water glass. Geopolymer with NaOH solution as activator had a compressive strength which was higher compared to geopolymer with KOH solution as an activator. However, geopolymer with NaOH solution-water glass as activator had a compressive strength which was lower compared to geopolymer with KOH solution-water glass as activator either at room temperature curing or at a curing temperature of 60 °C. The use of water glass with NaOH or KOH solution as activator could increase the compressive strength of geopolymer and yielded geopolymer having more dense and more homogeneous microstructure seen from SEM images. XRD patterns revealed the presence of sodium aluminosilicate hydrate in geopolymer with NaOH solution and NaOH solution-water glass as activators, and potassium aluminosilicate hydrate in geopolymer with KOH solution and KOH solution-water glass as activators. Furthermore, FTIR spectra indicated asymmetrical vibration of Si(Al)-O at around 1008 cm-1 related to geopolymer product.

SINTESIS GEOPOLIMER DARI METAKAOLIN DAN ABU BAMBU UNTUK APLIKASI SEMEN: KAJIAN WAKTU IKAT DAN MIKROSTRUKTUR Aprilina Purbasari; Tkokorde Walmiki Samadhi
Jurnal Inovasi Teknik Kimia Vol 4, No 2 (2019)
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v4i2.3020

Geopolimer merupakan polimer anorganik dengan ikatan polimerik Si-O-Al yang dapat dimanfaatkan sebagai pengganti semen Portland karena proses produksinya berlangsung pada suhu rendah dibandingkan produksi semen Portland dengan bahan baku material alumino-silikat yang dapat berasal dari mineral alam dan limbah padat. Pada penelitian ini geopolimer dibuat dari campuran metakaolin dan abu bambu dengan aktivator alkali campuran larutan KOH 10 N dan larutan Na-Silikat serta campuran larutan NaOH 10 N dan larutan Na-Silikat. Waktu ikat pembentukan geopolimer dan mikrostruktur geopolimer yang dihasilkan telah dikaji pada penelitian ini. Waktu ikat awal dan akhir pembetukan geopolimer dengan aktivator alkali campuran larutan KOH 10 N dan larutan Na-Silikat lebih pendek dibandingkan dengan aktivator alkali campuran larutan NaOH 10 N dan larutan Na-Silikat. Hasil analisis SEM menunjukkan bahwa pada kedua geopolimer terbentuk fase kontinyu. Untuk hasil analisis XRD, pada geopolimer dengan aktivator alkali campuran larutan KOH 10 N dan larutan Na-Silikat terdapat leucite dan quartz, sedangkan pada geopolimer dengan aktivator alkali campuran larutan NaOH 10 N dan larutan Na-Silikat terdapat hydrosodalite dan quartz. Pada kedua geopolimer menunjukkan adanya struktur amorf. Kata kunci: abu bambu, geopolimer, metakaolin, mikrostruktur, semen, waktu ikat Kata kunci: abu bambu, geopolimer, metakaolin, mikrostruktur, semen, waktu ikat

Penyuluhan dan Pelatihan Pembuatan Hand sanitizer kepada Dawis Cendrawasih Manyaran Semarang Noer Abyor Handayani; Aprilina Purbasari; Dessy Ariyanti; Heny Kusumayanti
Jurnal Pengabdian Vokasi Vol 2, No 1 (2021): Juni 2021
Publisher : Sekolah Vokasi Universitas Diponegoro

Covid 19 is a disease that can be transmitted through droplet droplets produced when talking, coughing or sneezing. Currently, a clean lifestyle is a demand in socializing, one of which is washing your hands frequently. However, people are constrained to wash their hands frequently when doing activities outside the home. Therefore, people need hand sanitizers as a substitute for soap and water that can be used instantaneously. At the beginning of the pandemic, the number of hand sanitizers on the market dropped sharply because people experienced mass panic, so they made purchases in very large quantities and in a short time. Therefore, training for the community regarding the manufacture of hand sanitizers is necessary. This community service aims to provide training in making handsanitizers to Dawis Cendrawasih mothers in Manyaran Village, West Semarang District, Semarang City. With this training, the community in Dawis Cendrawasih can make their own hand sanitizers so that a healthy lifestyle is maintained.

TiO2-PDMS Super Hydrophilic Coating with Self-Cleaning and Antimicrobial Properties Dessy Ariyanti; Afiatin Afiatin; Pury Diana Shintawati; Aprilina Purbasari
Jurnal Kimia Sains dan Aplikasi Vol 24, No 6 (2021): Volume 24 Issue 6 Year 2021
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

In this paper, self-synthesized TiO2 nanoparticle was used as a coating material with the addition of polydimethylsiloxane (PDMS) on the surface of the glass and ceramic substrate via spray coating. The self-cleaning properties of the coating with photocatalytic activity mechanism were observed under irradiation of black lamp as well as surface wettability. The antimicrobial properties and the morphology under a scanning electron microscope were also investigated. The results showed that the coating exhibited self-cleaning properties, as demonstrated by the photocatalytic degradation of methylene blue up to 80% and wettability as a super hydrophilic layer with a water contact angle less than 10° for both glass and ceramic substrate. The coating also shows an antimicrobial property by extending the radius of microbial growth up to 67% compared to the uncoated sample. 3% TiO2 addition with 50% w/w PDMS is the optimum coating ratio for maximum photocatalytic activity, super hydrophilic, and antimicrobial properties.

Co-Authors . Suherman Afiatin Afiatin Afri Yenni Agnesia Permatasari Alice Pramashinta Anissa Ardanti Wulandari Ariestya Meta Devi Arif Fajar Utomo Aulia Beta Safira Budi Ismadi Budiyono Budiyono Darmaji, Timothius Adrian Christantyo Dessy Ariyanti Dessy Ariyanti Didi Dwi Anggoro Ekky Febri Ariani Erwan Adi Saputro Faleh Setia Budi Farida Diyah Hapsari Fikri Mudzakir Marasabessy Hafsah Fajrin Aprilianti Hamzah, Fazlena Hargono Hargono Heny Kusumayanti Heny Kusumayanti Herry Santosa Heru Susanto Kristinah Haryani Kusmiyati Kusmiyati Laeli Kurniasari Lesdantina, Dina Lukman Atmaja Lulluil Mahsunnah Luqman Buchori M. Djaeni Machmud Lutfi H Margaretha Praba Aulia Mira Amalia Hapsari Muhammad Adi Irawan Muslim, Aristianto Nita Aryanti Nita Aryanti Noer Abyor Handayani Noer Abyor Handayani Nungki Primastuti Pratama, Pambudi Pajar Purwanto Purwanto Purwanto Purwanto Pury Diana Shintawati Raizka Kharisma Mediani Ratnawati Ratnawati Restu Kusumawardani Rini Kusumawati Samadhi, T Walmiki Saputra, Erwan Adi Sary, Cindy Nella Setia Budi Sasongko Shalahudin Nur Ayyubi Shalahudin Nur Ayyubi Silviana Silviana Silviana Silviana Siswo Sumardiono Slamet Priyanto Sri Rukiyawati Suherman , Suherman Suherman Titik Istirokhatun Tjokorde Walmiki Samadhi Tjokorde Walmiki Samadhi Tjokorde Walmiki Samadhi Tkokorde Walmiki Samadhi Tutuk Djoko Kusworo Vitus Dwi Yunianto Vitus Dwi Yunianto Budi Ismadi Wahyu Zuli Pratiwi Wei Gao Wisnu Jati N Wulandari Dharsono Y. Saptiana Oktari Yazid Bindar Yazid Bindar Yustina Linasari

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