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ERWAN ADI SAPUTRO
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International Journal of Eco-Innovation in Science and Engineering (IJEISE)
Published by Universitas Pembangunan Nasional Veteran Jawa Timur
ISSN : -     EISSN : 27218775     DOI : https://doi.org/10.33005/ijeise
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Industrial & Manufacturing Engineering Mechanical Engineering
International Journal of Eco-Innovation in Science and Engineering (IJEISE) covers all topics of Eco-Innovation in Science and technology related research from Chemical Engineering, Environment Engineering, Civil engineering, Industrial Engineering, Food Technology, Agrotechnology and others science and engineering field. IJEISE publish 2x a year (May and November).
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 9 Documents
 1 
Search results for , issue "Vol. 3 No. 1 (2022): IJEISE" : 9 Documents clear
Kinetic models of candle shell alkaline hydrolysis in obtaining oxalic acid Siswanto; Wahyusi, Kindriari Nurma; Panjaitan, Renova; Nurmawati, Ardika; Najakha, Ellen Oktavia Hanim
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 3 No. 1 (2022): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v3i01.41

Abstract

The kinetic reaction of alkaline hydrolysis of candlenut shells to produce oxalic acid was investigated. It was performed for the non-catalyzed solid-liquid heterogeneous reaction in a range time of 30 to 90 minutes and temperature of 60oC to 90oC. This study showed that the reaction fitted the pseudo-first-order model, confirmed from the determinant coefficient value of 0.9182 to 0.9751, and the kinetic constant, evaluated using Arrhenius' law, was k= 0.034751 e^(-140.23⁄T). The rate control mechanism based on the shrinking core model was diffusion control, validated from determinant coefficient near one, from 0.9246 to 0.9766.
Kinetic models of candle shell alkaline hydrolysis in obtaining oxalic acid Siswanto; Kindriari Nurma Wahyusi; Renova Panjaitan; Ardika Nurmawati; Ellen Oktavia Hanim Najakha
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 3 No. 1 (2022): IJEISE
Publisher : International Journal of Eco-Innovation in Science and Engineering (IJEISE)

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

Abstract

The kinetic reaction of alkaline hydrolysis of candlenut shells to produce oxalic acid was investigated. It was performed for the non-catalyzed solid-liquid heterogeneous reaction in a range time of 30 to 90 minutes and temperature of 60oC to 90oC. This study showed that the reaction fitted the pseudo-first-order model, confirmed from the determinant coefficient value of 0.9182 to 0.9751, and the kinetic constant, evaluated using Arrhenius' law, was k= 0.034751 e^(-140.23⁄T). The rate control mechanism based on the shrinking core model was diffusion control, validated from determinant coefficient near one, from 0.9246 to 0.9766.
IMPROVING ENGLISH LEARNING FOR KINDERGARTEN STUDENTS THROUGH COMMMA APPLICATION IN NEW NORMAL ERA Kinanti R. Hayati; Afita D. Prastiwi; Dwi S. Donoriyanto; Tranggono; Zinedine A. Sasmito
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 3 No. 1 (2022): IJEISE
Publisher : International Journal of Eco-Innovation in Science and Engineering (IJEISE)

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

Abstract

English is one of international languages for connecting and sharing knowledge throughout the world. As regulated in the national standards of early childhood education (PAUD), language is one of the measurement criteria in the early childhood education system. The aim of this research is to assist schools in improving human resources by providing training on English teaching methods with the Total Physical Response (TPR) method and English teaching applications with the android-based application called Comma. we collaborated with partners to design and create Comma application concept and system. The aim of this program is improving the quality of human resources in terms of teaching English for kindergarten students. The test results state that all operations can be performed on this Comma application which shows the system operated as expected or it can be said that the system testing is successful so that the Comma application is ready to be released and used by users who need this application to improve their English skills through the TPR method. With the Comma application, it can be used to improve understanding of the English language, especially in early childhood education and can be used as a good alternative in teaching English in the early childhood education environment.
Corrosion Inhibition Effect of the Essential Oil of Dried and Fresh Crystal Seedless Guava Leaves (Psidium guajava) in Acid Medium Lilik Suprianti; Nove Kartika Erliyanti; Caecilia Pujiastuti
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 3 No. 1 (2022): IJEISE
Publisher : International Journal of Eco-Innovation in Science and Engineering (IJEISE)

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

Abstract

This research studied the corrosion inhibition activities of the essential oil of crystal seedless guava leaves (Psidium guajava) in an acid medium. The essential oil (EO) was extracted from the different treatments of raw materials (fresh and dried leaves) using the microwave hydrodistillation method with a power of 600 Watt. Water was used as the solvent, with the ratio of feed to solvent (w/v) 1:7. The extraction duration was over 3 hours. The extraction process was done at atmospheric pressure and 100oC. Different raw material treatments result in different yields, where the highest yield was obtained from the dried leave, with the value reaching 1.08%. The essential oil chemical compound was determined by GC-MS analysis. The main component obtained were caryophyllene (44.98%) and Caryophyllene oxide (14.96%). The essential oil was applied as a corrosion inhibitor for carbon steel in a 1 M Hydrochloric acid (HCl) medium. The inhibition efficiency (IE) was 67% at a concentration of 0.3g/L, while the fresh leaves essential oil was only 63%. The dried leave EO performs a higher anti-corrosion effect than the fresh leaves EO. These results show crystal seedless guava leaves' essential oil has anti-corrosion activities on carbon steel in an acid medium.
Analysis of bio-briquette preparation from teak tree (Tectona grandis Linn. f) Renova Panjaitan; Ian Yusuf Syaputra; Cintaka Natanaelli; Lucky Indrati Utami; Kindriari Nurma Wahyusi
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 3 No. 1 (2022): IJEISE
Publisher : International Journal of Eco-Innovation in Science and Engineering (IJEISE)

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Abstract

The government has taken energy deflation seriously and is trying to find solutions by implementing energy efficiency and utilizing renewable energy sources. That action also supports the procedure to save the world from the ongoing climate crisis. One of Indonesia’s potential renewable energy sources is biomass, which can be in the form of plantation waste such as teak branches. Based on the analysis results, charcoal made from teak branches had a carbon content about 62.5968%, so it was pretty potential to be used as raw material for bio-briquettes. In this research, bio-briquette from teak branches' charcoal using tapioca binder has been successfully carried out. The manufacture of bio-briquettes was studied by observing the effect of the size parameters of teak charcoal and binder ratio on the heating value and water content of briquettes. The analysis results showed that these two parameters significantly affected the quality of teak branches' bio-briquette. In the ranking, the particle size was much more significant in influencing the calorific value of bio-briquettes, while the binder ratio had more influence on the water content value. The obtained bio-briquettes' calorific value and water content have met the established standards.
A brief review of C-Dots preparation using top-down and bottom-up approaches Nur Aini Fauziyah
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 3 No. 1 (2022): IJEISE
Publisher : International Journal of Eco-Innovation in Science and Engineering (IJEISE)

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Abstract

This review paper aimed to reveal several methods that have been used in the preparation of carbon dots (C-Dots). C-Dots were principal to be studied because they have luminous properties that can be used in photocatalyst processes, heavy metal sensors, glowing paints, and nanoparticles for biomedical applications such as bio-tagging. The methods that have been developed were also varied using the two principal approaches, i.e., top-down and bottom-up. Here, we tried to reveal the arc-discharge, laser ablation techniques for top-down approaches, while simple heating methods (simple hydrothermal methods), and microwave for bottom-up. Furthermore, the microwave method was excellent because of the vibration process which caused the carbon chains to undergo rearrangement so that the result was not much reducing the water content in the solution.
Optimization ZnO Properties for Electron Transport Layer (ETL) of Hybrid Solar-cell Prepared with Sol-gel Method Combined with Reflux Treatment Pardi Sampe Tola
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 3 No. 1 (2022): IJEISE
Publisher : International Journal of Eco-Innovation in Science and Engineering (IJEISE)

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Abstract

Electron-hole pair (exciton) generation and extraction from solar-cell photoactive layer is the main parameters determined solar-cell performance. Generally solar-cell consists of a photoactive layer sandwiched between electron transport layer (ETL) and hole transport layer (HTL). Exciton separation and extraction from photoactive layer depend on several properties: energy level match of photoactive layer and charge transport layer, surface contact area of photoactive layer and charge transport layer, and charge transport properties of charge transport layer. ETL and HTL should meet several characteristic e.g.: high transparency in UV-visible light region, high degree of crystallization to minimize charge lose and high electron or hole mobility. In this study we try to fabricate ZnO as an ETL of hybrid solar-cell with sol-gel method combined with reflux treatment. The quality of ZnO ETL highly effected by precursor solution properties; solution homogeneity, viscosity and stability. These precursor solution properties depend on chemical composition and reaction condition, reflux treatment designed to enhance precursor solution reaction time and increase solution stability. Previous study shown low solution stability of ZnO precursor prepared with sol-gel without reflux treatment which resulting on low ETL quality. Visible observation of the resulting precursor solution showed that reflux treatment enhances solution stability, while solution prepared without reflux treatment easily formed precipitation phase. Furthermore, ZnO powder prepared with reflux treatment exhibit preferable crystallization and small ZnO crystallite size. Low-temperature crystallization of ZnO prepared with sol-gel method combined with reflux treatment, make it is possible to fabricate thin film with small particle size therefore able to enhance surface contact area of photoactive layer and ETL.
Synthesis and Modification of Nano-Precipitated Calcium Carbonate (PCC) with Addition of Ethylene Glycol Sani; Mega Rosilina; Mochamad Titus Maulana; A.R Yelvia Sunarti; Srie Muljani; Dwi Hery Astuti; Isni Utami
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 3 No. 1 (2022): IJEISE
Publisher : International Journal of Eco-Innovation in Science and Engineering (IJEISE)

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Abstract

ZA fertilizer waste (Ammonium sulfate) is waste generated from the industrial process of producing ZA fertilizer. The waste contains very high calcium and has the potential to be used as a raw material in the manufacture of Precipitated Calcium Carbonate (PCC). PCC with certain qualities can be developed in the field of advanced materials, with size modification into nanoparticles. One method to produce nanoparticles is using the coprecipitation method, with the help of a polymer solution. This study aims to produce Nano-PCC by finding the best conditions of CaCl2: Ethylene Glycol mole ratio and stirring speed. Nano-PCC is synthesized by reacting fertilizer waste with HCl to form a CaCl2 solution. Then, the solution is mixed with ethylene glycol to prevent particle agglomeration so that the size obtained will be smaller. The mixture is then reacted with Na2CO3 to form precipitated calcium carbonate (PCC). In this study, the variables were the mole ratio of CaCl2: ethylene glycol (1:12, 1:14, 1:18, 1:20) and stirring speed (350, 500, 650, 800, and 950 rpm). Based on PSA analysis, the Nano-PCC obtained at the smallest CaCl2: ethylene glycol ratio 1:12, stirring speed 950 rpm was 51.83 nm. Based on Scherrer’s calculations with XRD, the particle size obtained was 48.25 nm. SEM analysis showed that the crystals formed were dominated by vaterite crystals, with a size range of 55.71-607.79 nm.
Catalytic Decomposition of Azo Dye Using ZnO in Sunlight Ram Babu Pachwarya; Euis Nurul Hidayah; Dr. Rekha Kashyap; A.L. Ramanathan; R.C. Meena; Pramod Kumar Meena; Syadzadhiya Q.Z. Nisa
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 3 No. 1 (2022): IJEISE
Publisher : International Journal of Eco-Innovation in Science and Engineering (IJEISE)

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Abstract

The degradation of azo is a challenge for environmentalists. Catalytic decomposition of azo dyes by ZnO heterogeneous photocatalysis and the influence of operating parameters such as light intensity, temperature, amount of ZnO catalyst, solution pH and amount of pollutants. It has been observed that ZnO catalysts is quite capable of removing azo dyes in the presence of sunlight. We can use the same catalyst over and over, and it works well every time. We recovered 99% clear water within a few hours of exposure to sunlight.

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