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All Journal International Journal of Renewable Energy Development CALYPTRA : Jurnal Ilmiah Mahasiswa Universitas Surabaya Jurnal Bahan Alam Terbarukan
Teguh Ariyanto
Chemical Engineering Department, Universitas Gadjah Mada, Jl. Grafika, No. 2, Yogyakarta 55281
Chemistry Education Energy Materials Science & Nanotechnology

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EVALUASI MANAGEMENT CONTROL SYSTEM DALAM MENINGKATKAN CONTROL PADA AKTIVITAS OPERASIONAL PADA CV “X” DI SURABAYA Ariyanto, Teguh
CALYPTRA : Jurnal Ilmiah Mahasiswa Universitas Surabaya Vol 3, No 2 (2014): CALYPTRA : Jurnal Ilmiah Mahasiswa Universitas Surabaya
Publisher : University of Surabaya

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Abstract

Bisnis Keluarga merupakan badan usaha yang sering kali dijumpai dibanyak negara. Bisnis keluarga sendiri merupakan sumber penciptaan kekayaan pribadi dan juga merupakan perekonomian regional khususnya wilayah asia. Bisnis keluarga sendiri tidak terlepas dari suatu masalah. Adapun masalah yang dihadapi antara bisnis keluarga antara satu dan yang lain berbeda-beda. Oleh karena itu diperlukan sebuah sistem pengendalian manajemen untuk mengatasi suatu masalah tersebut. Pada penelitian ini obyek yang digunakan adalah CV “X” yang dimana juga merupakan bisnis keluarga yang bergerak pada bidang jasa yang khususnya jasa perbaikan kapal serta kontraktor. Penelitian juga merupakan applied research yang bertujuan untuk memberikan rekomendasi pada CV “X” Surabaya mengenai sistem pengendalian manajemen dalam upaya untuk meningkatkan kontrol pada aktivitas operasionalnya. Pendekatan pada penelitian ini adalah pendekatan secara kualitatif. Temuan yang didapatkan selama observasi atau masa penelitian  adalah masih lemahnya kontrol pada aktivitas operasional pada CV “X” yang dimana berdampak pada penyelesaian pekerjaan serta kualitas hasil yang tidak sesuai dengan harapan dari seorang pemilik. Dalam hal ini CV “X” perlu memperbaiki sistem pengendalian manajemen agar control yang ada dalam CV “X” meningkat dan pekerjaan dapatterselesaikan sesuai tepat pada waktunya dan kualitas hasil pekerjaan sesuai dengan apa yang diharapkan.
MODIFICATION OF IRON OXIDE CATALYSTS SUPPORTED ON THE BIOMASS BASED ACTIVATED CARBON FOR DEGRADATION OF DYE WASTEWATER Amelia, Shinta; Sediawan, Wahyudi Budi; Mufrodi, Zahrul; Ariyanto, Teguh
Jurnal Bahan Alam Terbarukan Vol 7, No 2 (2018): December 2018 [Nationally Accredited]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v7i2.17174

Abstract

Methylene blue is one of the dyes in textile industries which has a negative impact on the environment. This compound is very stable, so it is difficult to degrade naturally. Methylene blue can be harmful to the environment if it is in a very large concentration, because it can increase the value of Chemical Oxygen Demand (COD) which can damage the balance of environment ecosystem. Adsorption method by using activated carbon as the adsorbent is one of the most efficient and effective techniques in dye removal due to its large adsorption capacity. However, the adsorption method using activated carbon only removes the pollutant compounds to other media or phases. Other method that can be used includes Advanced Oxidation Processes (AOPs). This method has the advantage of being able to degrade harmful compounds in the waste through oxidation (oxidative degradation) processes. One method of AOPs is the process by using Fenton reagents. This study was aimed to prepare and characterize iron oxide/porous activated carbon catalyst. The type of porous activated carbon used was carbon from biomass derived carbon with microporous character. This biomass carbon is obtained from renewable natural products, namely coconut shell.The kinetics and adsorption models in the material will be derived and evaluated from the research data. Based on the research, it can be concluded that catalytic degradation is very effective for degradation of dye wastewater. Methylene blue degradation increases with the use of Fe2O3/activated carbon catalyst and the addition of hydrogen peroxide as the Fenton reagent. In addition, the pore structure difference in the catalyst also had a significant effect on the methylene blue degradation reaction resulting in increased capacity of methylene blue degradation reactions.
The Effect of Amine Types on Breakthrough Separation of Methane on Biogas Masruroh, Kuni; Cahyono, Rochim Bakti; Prasetyo, Imam; Ariyanto, Teguh
International Journal of Renewable Energy Development Vol 10, No 2 (2021): May 2021
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2021.33514

Abstract

Methane (CH4) and carbon dioxide (CO2) are the main components of a renewable energy source of biogas. Separation of CO2 from biogas is significantly important to improve biogas performance, due to heating value in biogas depends on the concentration of methane. One of the gas separation technologies that has been widely used in chemical industries is carbon molecular sieve (CMS). This research explores the potential of CMS for biogas purification. CMS was prepared by modification of palm kernel shell-derived porous carbon using amine groups such as monoethanolamine (MEA), 2-amino-2-methyl-1-propanol (AMP), and diethanolamine (DEA). The effect of amine types on the separation parameters was studied by using a breakthrough experiment to obtain the most potential CMS materials. The methods of this research include the process of carbon oxidation using hydrogen peroxide, impregnation with an amine group, characterization of the CMS material obtained, CO2 and CH4 gas separation testing with a breakthrough system. The CMS was characterized by using N2 sorption analysis, fourier transform infrared spectroscopy, and scanning electron microscopy. The breakthrough experiment showed that CMS-MEA had the highest performance for separating CO2 and CH4 gases. In addition, the results also showed that loading of amine groups on carbon caused an increase in the uptake capacity of CO2, and the highest capacity was achieved by CMS-MEA of 13.2 mg/g.
Co-Authors Amelia, Shinta Cahyono, Rochim Bakti Imam Prasetyo Masruroh, Kuni Wahyudi Budi Sediawan Zahrul Mufrodi, Zahrul