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All Journal Jurnal Kebidanan Jurnal Penelitian dan Evaluasi Pendidikan Reaktor Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains AVERROUS: Jurnal Kedokteran dan Kesehatan Malikussaleh Unri Conference Series: Community Engagement Jurnal Kesehatan Amanah Al-'Adad: Jurnal Tadris Matematika Karakter: Jurnal Riset Ilmu Pendidikan Islam
Komalasari Komalasari
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Model Kesetimbangan Pada Adsorpsi Ion Logam Timbal (Pb2+) Menggunakan Hidroksiapatit Dhamala Shobita Chandra; Ahmad Fadli; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The needs for industrial wastewater treatment for heavy metal have been a concern. Adsorption using hydroxyapatite (HAp) as adsorbent is one of the choice to remove heavy metal content economically and efficiently. The objective of this research is to study the effect of temperature and weight of adsorbent in adsorption as well as determine adsorption equilibrium model in the lead ion adsorption using Langmuir, Freundlich, and Temkin model. Lead (Pb2+) solution of 5 ppm was added with 0.9 gram, 1.0 gram, and 1.2 gram of HAp in a beaker glass and stirred with stirring rate of 300 rpm and temperature variation of 30°C, 40°C, dan 50°C. Solution samples was taken every 10 minutes until equilibrium and and analyzed for the remaining Pb2+ using ICP-OES instrument. The results showed that the increase of temperature reduce the rate of Pb2+ adsorption and increased of the weight of adsorbent increase the percentage of adsorption. The equilibrium time of lead ion adsorption is 50 minutes, with optimum condition obtained on 30°C and hydroxyapatite adition 1.2 gram. Equilibrium model describes the heat of adsorption and thermodynamics parameter of adsorption process, ∆H = -0.53 kJ/mole, ∆G < 0, ∆S = -144.1406 kJ/mole). Keywords: hydroxyapatite, adsorption, adsorpsion equilibrium model, lead (Pb2+)
Pengendalian Laju Korosi Baja Karbon Menggunakan Inhibitor Ekstrak Daun Jambu Biji (Psidium Guajava, Linn) Dengan Metode Maserasi Kartono Kartono; Komalasari Komalasari; Rozanna Sri Irianty
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Guava leaf extract has a considerable influence in decreasing the corrosion rate of a metal, because it contains tannin compounds which can be used as corrosion inhibitors. The purpose of this study was to determine the effect of addition of guava leaf extract inhibitors on the corrosion rate of carbon steel with variations in immersion time and determine the inhibition efficiency of variations in the concentration of guava leaf extract on carbon steel in corrosive media. The parameters varied in this study were the immersion time of the maceration process, the inhibitor concentration added in the corrosive solution of hydrochloric acid, namely 0; 0.5; 1.0 and 1.5 g/L as well as variations in the time of corrosion testing at 12, 24, 36 and 48 hours. The time of maceration process shows that the longer the contact time, the greater the concentration of crude tannin, while the time of immersion of steel shows the longer the immersion time, the corrosion rate tends to decrease with the addition of inhibitors and the higher the value of inhibitory efficiency. The best crude tannin concentration was obtained during the maceration process for 6 days with crude tannin concentration of 86.46 mg/L. The lowest corrosion rate was obtained on the addition of 1.5 g/L inhibitors with a 48 hours immersion time of 7.36 mm/year. The highest corrosion rate is without the addition of an inhibitor with a 36 hours immersion time of 26.09 mm/year. The results showed the best inhibition efficiency values using guava leaf extract inhibitors on the addition of 1.5 g/L inhibitors in soaked for 48 hours in 0.5 M hydrochloric acid corrosive media with an efficiency value of 70.31%.Keywords: carbon steel, corrosion rate, guava leaves, inhibitors, maceration
Kinetika Adsorpsi Ion Logam Cu2+ Menggunakan Tricalciumphosphate Sebagai Adsorben Dengan Variasi Kecepatan Pengadukan Dan Temperatur Mustika Canra; Ahmad Fadli; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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One of the heavy metals can pollute the waters is metal ions Cu2+. The purposes of this research are to observe the effect of stirring rate and temperature on the adsorption of metal ions Cu2+ using adsorbents tricalciumphsphate (TCP) and determine a suitable adsorption kinetics model. The procedure was begun by adding 1 gram of TCP into Cu2+ solution with a concentration of 3 ppm at stirring speed of 100 rpm, 200 rpm, and 300 rpm and a temperature of 30oC, 40oC, and 50oC. Samples were taken every 2 minutes, filtered and analyzed by atomic absorption spectrophotometer (AAS). The result demonstrated that the suitable kinetic model for adsorption of metal ions Cu2+ using TCP adsorbent is pseudosecond order kinetic model with adsorption kinetics constant value of 3,125 g/mg.min. The increased the stirring rate and temperature increase adsorption rat . Type of this adsorption is physics adsorption with activation energy value of 25,016 kJ / mol.Keywords: Adsorption kinetics model, the metal ion Cu2+, tricalciumphosphate, stirring rate and temperature.
Hidrolisis Daun Sawit Menjadi Glukosa Dengan Variasi Konsentrasi Asam Fosfat (H3PO4) Dan Rasio Substrat-Pelarut Boy Jansen Roberto Manik; Sri Rezeki Muria; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Indonesia, especially Riau is a palm oil producing region. The increase of plantation and palm oil production is directly proportional to the amount of waste produced. Increasing waste is not offset by the treatment of such waste as oil palm leaves waste. Oil palm leaves is a lignocellulosic material which can be used to make products, one of them is glucose which can be used to make bioethanol and others. This research is aims to determine the best concentration of phosporic acid (H3PO4) and substrate-solvent ratio in the oil palm leaves hydrolysis to produce high glucose levels. The process of glucose production from oil palm leaves is carried out in various stages, namely preparation of raw materials, acid pretreatment process, analysis of raw materials and pretreatment, hydrolysis and results analysis. Acid pretreatmentwas carried out at temperature of 80ᴼC, within 60 minutes using sulfuric acid 0,5%. Hydrolysis is done by mixing sulfuric acid 60% and phosphoric acid in ratio 30:70, which is the concentration of phosphoric acid (60%,65% and 70%) and substrate ratio (product of pretreatment) with solvent (1:3 and 1:4) becomes the independent variable. Hydrolysis process is done by mixing solvent and substrate and left during 16 hours at room temperature, then added distilled water and cooked at 100 ᴼC during 2 hours. The result of this research obtained the best condition of oil palm leaves hydrolysis is the ratio of substrate-solvent 1:2 and phosporic acid 70% with a glucose level is 1977,8619 mg/L.Keywords : Glucose, hydrolysis, phosphoric acid, oil palm leaves, sulfuric acid
Bahan Bakar Padat Dari Pelepah Sawit Menggunakan Proses Karbonisasi Dengan Variasi Ukuran Bahan Baku Dan Suhu Qurotullaili Qurotullaili; Komalasari Komalasari; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Palm frond so far only used as a source of raw materials for animal feed, compost and organic fertilizer in the plantation. Palm frond has a calorific value of 15,184.05 kJ/kg. Utilization of palm frond as main material of solid fuel production with carbonization process can reduce the problem of oil palm plantations waste and can be increased the calorific value of product. The aims of this study is to produce solid fuel from palm fronds by using carbonization process and analyze solid fuel quality from palm frond with variation of raw material size and temperature. Variation of carbonization temperature were 450°C, 500°C and 550°C. Variation of raw material size 1.68 – 2.38 mm (-8 +10 mesh), 0.84 – 1 mm (-16 +20 mesh) and 0.42 – 0.5 mm (-32 +35 mesh). Water content were 3.66 – 4.86%, ash were 9.39 – 16.17%, volatile were 9.45 – 28.60% and fixed carbon were 57.26 – 70.01%. The highest caloric value was 28,410.94 kJ/kg for 550°C of carbonization temperature and 0.42 – 0.5 mm (-32 +35 mesh) of raw material size.Keywords : biomass, caloric value,carbonization, palm frond
Pengendalian Laju Korosi Baja Dalam Air Laut Dengan Menggunakan Proteksi Katodik Metoda Anoda Korban Ayu Annisya Tri Adriana; Komalasari Komalasari; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Cathodic protection is a metal surface protection system against corrosion by direct current (DC ) from an external source to protect metal surfaces from corrosion. In this study, which the protection was employed of voltaic series sacrificial anode method, where the metal has a lower potential is used as sacrificial anodes in order to controlling carbon steel of corrosion. This research was conducted by using ASTM A36 steel in Bengkalis seawater with immersion lengths of 15, 20 and 25 days by using sacrificial anode of Al. The purpose of this research was to study the effect of cathodic protection in controlling the corrosion rate of carbon steel, determine the effectiveness of the sacrificial anode, and determine the best distance from the anode to the cathode. The design of the study was done by varying the type of anode in the form of Al , the anode to cathode distance 1 cm, 2 cm, 3 cm. Data was processed by using weight loss method with unit (mpy). The best protection occured at 15 days immersion, by using Al anode, the lowest corrosion rate is 1.448 mpy. In this study, the anode Al proved efective to protected carbon steel at a distance of 1 cm, and with an effectiveness of 69.06%.Key words: cathodic protection, corrosion rate, seawater, sacrificial anode
Dekolorisasi Kitin Menggunakan Aseton Putri Rahmadani; Ahmad Fadli; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Chitin is a biopolymer that can be used in the biomedical field. Chitin can be isolated from shrimp waste using chemical methods through deproteination and demineralization processes. To reduce color in chitin required decolorization stage. The purpose of this study was to study the effect of stirring rate and acetone concentration on the decolorization stage on the characteristics of chitin produced and to make mathematical modeling of carotenoid reduction from inside chitin using acetone in the decolorization stage. The research procedure begins with reducing the size of ebi waste into powder sizes. The powder was then reacted with 3.5% NaOH (deproteination), 1:10 (w / v) ratio for 2 h and stirring speed of 150 rpm. The deproteination product is reacted with HCl 1 N (demineralization), 1:15 (w / v) ratio for 1 h and stirring speed of 150 rpm. The demineralization product was decolourized using 60%, 80%, and 100% acetone, a ratio of 1:10 (w / v) at 70 ° C with a stirring rate of 0.150, and 300 rpm for 720 min. Samples were taken every 60 min increments of 5 mL, the solidified yield of the decolorization filtered and dried. The addition of carotenoids in acetone was analyzed using a UV-Vis spectrophotometer. The results showed that the increase of stirring speed and concentration of acetone, carotenoid content in the solvent also increased. The results of colorimeter test for chitin before decolorization had percentage whiteness of 53.2%, while for chitin at 100% acetone concentration with stirring rate 0 rpm and 300 rpm had a whiteness percentage of 57.9% and 70.3 %.Keywords: acetone, decolorization, carotenoid, chitin, shrimp waste
Ekstrak Kulit Pisang (Musa Paradisiaca) Sebagai Green Corrosion Inhibitor Pada Baja Karbon Rendah Dalam Larutan Hcl 0.5 M Dan 1 M Sry Utami Pardede; Komalasari Komalasari; Zultiniar Zultiniar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Corrosion has been identified as one of the major problems in the chemical industry, especially in the pipeline’s system. The inhibitor is the most effective way to protect the metal against corrosion. The natural corrosion inhibitor is chosen as an alternative because it’s safe, widely available, low cost, biodegradable and environmentally friendly. This study aims to know the corrosion rate and the inhibition efficiency of banana peel extract for low carbon steel. Banana peel extract was obtained by soxhlet extraction using ethanol-water as the solvent. Corrosion rate were determined by using the weight loss method. Low carbon steel was immersed in HCl 0.5 m and 1 M with and without banana peel extract 0 g/L, 0.5 g/L, 1 g/L, 1.5 g/L and 2 g/L by immersion time 24 h. The result showed that corrosion rate decreases on increasing of concentration of the extract and increases the inhibition efficiency. The maximum efficiency was obtaining at 2 g/L of corrosion inhibitor in HCl 0.5 M with inhibition efficiency 82.19%.Keywords: banana peel extract, corrosion, HCl, inhibitor, low carbon steel
Sintesis Biodiesel Dari Minyak Biji Nyamplung (Calophyllum Inophyllum) Menggunakan Katalis Geopolimer Berbasis Kaolin Al Qarni Putra; Edy Saputra; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Biodiesel is one of alternative energy which replace the fossil fuel as the product of transesterification of vegetable plants. Whole this time, the process of making biodiesel using homogeous catalyst NaOH or KOH which produce soap and hard to separate biodiesel product using catalyst as its disadvantages. Therefore, by using heterogen catalyst, researcher start to develop it using catalyst geopolymer in the oil of calophylluminophyllum seed. The objective of this research is making biodiesel from the oil of calophylluminophyllum seed, knowing the influence of geopolimer ctalyst toward the number of biodiesel that has been produced, knowing the best condition of making biodiesel and also identifying the charateristics of calophylluminophyllum seed oil. This research starts from raw material preparation which include mixing, heating, and refinement. Furthermore, degumming the calophylluminophyllum seed oil to remove impurities contained in the oil. The transesterification process of oil has done in different level of speed i.e 200, 300, 400 rpm respectively and various catalyst concentration i.e 1%, 2%, 3% respectively at methanol of oil mole ratio 9: 1 and the reaction temperature of 60 °C and a reaction time of 120 minutes. From the result was obtained that the highest biodiesel of 92,14% at the stiring speed 400 rpm with 2% concentration geopolymercatalyst. Physical characterization have done such as density 878 kg/m3, kinematic viscosity3,67 mm2/s, acid number 0,46mg-KOH/g biodiesel and flash point 137°C respectively according to the standard of Indonesian biodiesel (SNI 7182:2015).Keywords :Biodiesel, calohyllum inophyllum seed oil, geopolymer
Pengaruh Waktu Dan Suhu Pretreatment Ampas Tebu Menggunakan Asam Sulfat Encer Astri Gusrita; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Currently, Indonesian is still relies on non-renewable energy sources (fossil). One of alternative to replace fossil fuel is with bioenergy such as bioethanol. Bioethanol can be produced from lignocellulose biomass such as sugarcane bagasse. Sugarcane bagasse is lignocellulose biomass with 39,26% cellulose, 7,49% hemicellulose, and 23,48% lignin. To take cellulose contained in sugarcane bagasse, a pretreatment process is needed. Pretreatment process is the process of removing lignin from cellulose. The purpose of this study is to determine the optimum conditions of the pretreatment process with time and temperature variation. The stages that carried out in this study are raw material preparation, pretreatment, and analysis. Preparation of raw materials is cutting bagasse up to 0,5 cm and dry it at room temperature. The pretreatment process used acid solvent with low concentrations of H2SO4 0,5 M with time variations of 30 minutes, 60 minutes, 90 minutes, and temperature variations of 60oC, 80oC, 100oC. Pretreatment analysis was performed using the Chesson-Datta method. The optimum pretreatment conditions in this study were at time variation of 60 minutes and temperature of 80oC, with 62,84% cellulose and 19,88% residual lignin. The temperature used in the pretreatment affects the length of time needed for the process to get optimum results. Keywords: cellulose, lignin, pretreatment, sugarcane bagasse
Co-Authors A. Fadli Abdul Hafiz Hidayat Abdul Rahman Marwis Karim Abdullah Agung Hayyuka Adela Shofia Addabsi Adha Widoni Agung Prabowo Ahmad Fadli Al Qarni Putra Amun Amri Astri Gusrita Asyraful Akbar Ayu Annisya Tri Adriana Boy Jansen Roberto Manik d R. Sari Dani Pradana Desi Heltina Dhamala Shobita Chandra Dimas Nofriyan Drastinawati Drastinawati Edy Saputra Eferius Mendrofa Evelyn Evelyn Fachry Abda El Rahman Fadhila Ulfa Farhan Hidayatullah Farida Farida Fauzia Mulyana Fikri Miftahul Shiddiq Firman Tampubolon fitriyanti fitriyanti Getra Anugrah Hadrian Yonas Sebastian Napitupulu Harfiah Faradila Ian Desi Rosalina Situmeang Ida Zahrina Ilham Habib Ines Indriyani Jimmy Anderson Kartono Kartono Kendro Prasetyo M. S. Amir Mardianti Mardianti Mastiar Krisdayanti Sinaga Muhammad Alfin Khairullah Muhammad Khairil Amri Muhammad Rivaldiansyah Mustika Canra Oding Sitorus Paian Harianja Primadevi, Inggit Putri Rahmadani Qurotullaili Qurotullaili Rahmat Ilham Rajuddin Rajuddin rima siburian Rina Maryenti Riona Sanjaya Roin Nuretha Rozanna Sri Irianty Roziana Roziana Saefudin Zuhri Siska Siska Siti Chotijah Sri Rezeki Muria Sry Utami Pardede Syelvia Putri Utami Teuku Azhari Hassan Tubagus Maruf Ansori Vina Sutratul Putri Viona Aulia Rahmi Wahyu Hidayat Yelmida Azis Zuchra Helwani Zultiniar Zultiniar