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Journal of Vocational Studies on Applied Research
Published by Universitas Diponegoro
ISSN : -     EISSN : 26848090     DOI : -
Core Subject : Engineering,
Engineering
Journal of Vocational Studies on Applied Research [e-ISSN 2684-8090] is an open access peer reviewed journal published by Vocational School Diponegoro University Semarang Central Java Indonesia. Journal of Vocational Studies on Applied Research is an Journal publishing academic and industrial topics which covers area of interest on applied research as well as vocational studies. Research papers on Engineering, Science and Vocational Studies are welcomed. The Journal is double-blind reviewed which accepts Original Research Paper, Short Communication and Review Articles.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "Volume 4, Issue 1, Year 2022 (April 2022)" : 6 Documents clear
The Optimization of Additional of Glycerol on the Biodegradable Foam from Corn Husk Syefrin Syahadatia Gani; Heny Kusumayanti
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14303

Abstract

Biodegradable foam is one of the packaging food friendly nature the environment. In process, biodegradable foam is still have low water absorpstion and low tensile strength. Biofoam made from raw starch and fiber have low tensile strength. Addition plasticizer material of glycerol can increase tensile strength on the biofoam. This research uses the baking process method. Based on research, biofoam with addition glycerol can affect the physical and mechanical characteristics of the biofoam produced. The optimum conditions for biofoam present in concentration 7% glycerol with value of the tensile strength 0.42 Mpa and value of power absorb water 35.07% and bidegradibility value in is 27.76% in 14 days. Glycerol can increase elasticity, because capable in reduce bond internal hydrogen so can decrease distance intermolecular, so that can increase value of the thensile strength. Variation condition operation influential on visuals and textures the resulting biofoam with optimum conditions 135℃ for 50 minutes. Temperature gelatinization starch sago 73 – 79℃. On this research, using variation temperature 115℃ and 135℃. And analysis result morphology show biofoam with high temperature have a high water absoprtion because if already pass temperature gelatinization starch so starch will form a paste and dissolve in water.
Optimization of Pb(II) Metal Adsorption on Pomelo Peel Biosorbent by Immobilization in Ca-Alginate Zulfa Wulandari Rasyid; Vita Paramita
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14624

Abstract

Industrial wastewater is a source of water pollution that dominates today. Wastewater is known to cause damage to the environment, health and threatens the availability of clean water. Industrial wastewater is a problem because it contains a lot of dangerous heavy metals, one of which is Lead or Pb(II).' Adsorption technology has become one of the most exciting technologies because of its good performance. Adsorption media currently popular for the study is adsorption using agricultural waste. One of the agricultural wastes that can be used as biosorbent is grapefruit peel (Citrus maxima). The functional groups in grapefruit peel are ether, pedophilic, carboxyl, carbonyl, and hydroxyl. These functional groups are essential in binding heavy metals from the aquatic environment. In this study, grapefruit peel was modified into a Ca-alginate immobilized biosorbent. The analyzes that will be carried out include the characteristics of the biosorbent, namely the water content and ash content test, the FTIR test to determine the functional groups contained in the biosorbent, the SEM-EDX test to assess the appearance of the biosorbent, as well as analysis of the initial and final levels of Pb(II). Based on the results obtained, the best percentage decrease in Pb(II) levels was obtained with operating conditions of pH 4.7, contact time of 90 minutes, and Pb(II) concentration of 100 mg/L with a percentage decrease in Pb(II) levels of 89%.
Reducing COD Levels of Batik Waste Using Chicken Egg Shells and Tea Dregs Anggrek Sinar Puspita; Zulaikhah Fatmawati; Vita Paramita
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14622

Abstract

In the last ten years, the batik industry has experienced very rapid growth. This provides benefits but also has adverse effects on humans and the environment because the sector generates waste. Batik liquid waste contains chemical compounds that can increase the COD value. Alternative treatment of liquid waste from batik factories is the biosorption process using biosorbent from chicken egg shells and tea dregs. This study aimed to investigate the effect of variations in the biosorbent ratio, contact time, and initial pH of the sample on changes in COD. In this study, the acid activation method was used to increase the ability of the biosorbent to absorb the COD content in the batik industry wastewater. This research method uses the Response Surface Methodology (RSM) method, where the biosorbent made is then contacted with batik wastewater to determine the decrease in COD levels contained in it. The critical value was achieved when the material ratio was 12.3270 grams of eggshell, with a contact time of 47.1281 at a pH of 1.71281. The best results were obtained in sample 5 with a biosorbent ratio of 11.25:3.75, contact time of 50 minutes, and initial pH 2 with a decrease in COD levels of 77%.
Optimization and Characterization of Physical–Mechanical Properties of Biodegradable Edible Films Based on Pectin from Breadfruit Peel for Food Packaging Andi Hidayatullah Mappamadeng; Rizka Amalia
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14175

Abstract

Abstract - This study aims to determine the characteristics and optimization of biodegradable films based on pectin from breadfruit peel. The study was employed using a factorial design with multiple variables: pectin (2 and 4 grams), sorbitol concentration (10% and 20%) and drying temperature (1200C and 1400C) were studied. The results obtained from eight samples showed that the water vapor transmission rate was in the range of 3.525 - 6.952 g/m2.day. The best-achieved water vapor transmission rate (3,525 g/m2.day) was obtained at specific operating conditions, namely 4 grams of pectin, 20% of sorbitol concentration and drying temperature of 1400C. In this study, the most influential factor for water vapor transmission rate is pectin weight with the value effect of -1.238. The highest tensile strength test and percentage elongation were 116.55 kgf/cm2 and 10%, respectively. The FTIR analysis showed that the pectin from breadfruit peel was according to commercial pectin standard, by the presence of OH and ester (COOH) groups. The SEM Analysis showed  that the molecular structure of edible films did not look porous, dense, but not flat on its surface, thus less permeable to air.Keywords - Bioedible film, Breadfruit peel, Pectin, Food packaging
Formulation of Antibacterial Liquid Soap Based on Virgin Coconut Oil with Various Concentrations of Carica Concentrate and Potassium Hydroxide Volume Siti Dianti; Heny Kusumayanti
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14140

Abstract

Carica is one of the main commodities in Dieng, Central Java. It contains vitamin A, vitamin C, and antibacterial substances such as flavonoid, polifenol, and tannin. Due to its content, carica can be used as an additive for soap products.  Soap is one of the cosmetic products, produced from the saponification reaction between alkali and fatty acids. Carica liquid soap was carried out by  reacting KOH with virgin coconut oil that contains fatty acids, then adding carica fruit juice and other ingredients. The product of liquid soap will be analyzed including pH, density, free fatty acids content, organoleptic test, and antibacterial activity. The research method used is a factorial design. Research has shown that the carica liquid soap were in accordance with SNI 06-4075-1996 and SNI 06-3532-1994. The best quality of  carica liquid soap obtained at pH 11, density 1,0266, and free fatty acid content of 0,082%. Antibacterial activity was carried out using the paper disk method, showing that the antibacterial activity of the soap has a weak performances with an inhibition zone of 1,25 mm. The organoleptic test showed that panelist’s preference for carica liquid soap was low.
Optimization of Manufacturing liquid Soap Based on Virgin Coconut Oil with a Combination Potassium Hydroxide and Ammonium Hydroxide Yesi Kurniawati; Vita Paramita
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14463

Abstract

Virgin coconut oil has a better saponification effect than coconut oil in general. It has a high lauric acid content of 46%, suitable for skin moisture; it is good to be used as a primary ingredient for making natural liquid soap; hydrolysis is carried out on VCO to get free fatty acids ingredient raw material for making soap. This study will use a combination of KOH and NH4OH bases to produce more soluble soap in water. This study aims to determine the quality of natural liquid soap from the saponification process between VCO hydrolysis and base, whether by applicable quality standards, and determine the effect of base concentration, time, and temperature of mixing on the quality of the soap produced. The method in this study uses the Response Surface Methodology, where the resulting soap product is tested for physicochemical tests. The critical value for optimizing liquid soap is obtained at the KOH base ratio of 8, time 140 minutes, and temperature 92oC, and the critical value of FFA is 0, 21%. The best soap results are sample 6, which complied with SNI 06-4085-1996 and SNI 3532-2016.

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