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Publisher: Diponegoro University   (Total: 27 journals)   [Sort by number of followers]

Showing 1 - 27 of 27 Journals sorted alphabetically
Bulletin of Chemical Reaction Engineering & Catalysis     Open Access   (Followers: 2, SJR: 0.2, CiteScore: 1)
Geoplanning : J. of Geomatics and Planning     Open Access   (Followers: 1)
ILMU KELAUTAN : Indonesian J. of Marine Sciences     Open Access   (Followers: 1)
Indonesian Historical Studies     Open Access   (Followers: 2)
Intl. J. of Renewable Energy Development     Open Access   (Followers: 6)
Intl. J. of Waste Resources     Open Access   (Followers: 4)
Izumi : Jurnal Bahasa, Sastra dan Budaya Jepang     Open Access  
J. of Biomedicine and Translational Research     Open Access  
J. of Coastal Development     Open Access   (Followers: 2)
J. of the Indonesian Tropical Animal Agriculture     Open Access   (SJR: 0.126, CiteScore: 0)
Jurnal Anestesiologi Indonesia     Open Access  
Jurnal Gizi Indonesia / The Indonesian J. of Nutrition     Open Access   (Followers: 1)
Jurnal Ilmu Lingkungan     Open Access   (Followers: 1)
Jurnal Pengembangan Kota     Open Access  
Jurnal Presipitasi     Open Access   (Followers: 1)
Jurnal Reaktor     Open Access  
Jurnal Sistem Komputer     Open Access   (Followers: 2)
Jurnal Teknologi dan Sistem Komputer     Open Access  
Jurnal Wilayah dan Lingkungan     Open Access   (Followers: 1)
Kapal     Open Access   (Followers: 1)
Media Komunikasi Teknik Sipil     Open Access  
Nurse Media : J. of Nursing     Open Access   (Followers: 1)
Parole : J. of Linguistics and Education     Open Access  
Politika : Jurnal Ilmu Politik     Open Access  
Tataloka     Open Access  
Teknik     Open Access  
Waste Technology     Open Access   (Followers: 3)
Journal Cover
Jurnal Reaktor
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0852-0798 - ISSN (Online) 2407-5973
Published by Diponegoro University Homepage  [27 journals]
  • Front Mattter Vol 17 No. 4 December 2017

    • Authors: w Widayat
      Abstract: Cover, list of contents , Preface and editorial board
      PubDate: 2018-02-28
      Issue No: Vol. 17, No. 4 (2018)
       
  • Back Matter Vol 17 No. 04 December 2017

    • Authors: W Widayat
      Abstract: List of Author, indexing and Author Guidelines
      PubDate: 2018-02-28
      Issue No: Vol. 17, No. 4 (2018)
       
  • Identification of Compounds Released During Pyrolysis of Palm Kernel Shell
           (PKS) Using Pyrolysis-GC/MS

    • Authors: Dieni Mansur, Sabar Pangihutan Simanungkalit
      Pages: 185 - 190
      Abstract: Pyrolysis is one of thermochemical conversion to convert biomass into bio-oil. The higher energy content in bio-oil suggests its potential as a raw material in the production of energy, bio-fuels, and other chemicals. Pyrolysis of PKS and the chemicals released were studied using pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS) at 400-600°C. Prior to pyrolysis, thermogravimetry experiments were carried out to monitor the degradation temperature of hemicellulose, cellulose, and lignin in the PKS. Degradation of hemicellulose occurred within a temperature range of 150-330°C, whereas the cellulose was degraded in temperatures range between 330-400°C. Degradation of lignin took place within a broad range of temperatures, which reached maximum at temperatures range of 200-500°C. Based on the Py-GC/MS results, pyrolysis of PKS at 400°C produced bio-oil that can be used as biofuel due to its high aromatic compounds but low carboxylic acids contents. Keywords: bio-oil; chemical; palm kernel shell; Py-GC/MS; thermogravimetry .
      PubDate: 2018-02-19
      DOI: 10.14710/reaktor.17.4.185-190
      Issue No: Vol. 17, No. 4 (2018)
       
  • Ultrasound-Assisted Ultra-Mild-Acid Hydrolisis of -Carrageenan

    • Authors: Ratnawati Ratnawati, Nita Indriyani
      Pages: 191 - 196
      Abstract: The low molecular weight fraction of κ-carrageenan is useful in biomedical applications. An ultrasound-assisted acid hydrolysis of κ-carrageenan has been studied. κ-carrageenan with an initial number-average molecular weight of 629 kDa was dispersed in distilled water to form a 5 g/l solution. The pH (3 and 6) of the solution was adjusted by adding HCl solution. The depolymerization reaction was carried out in an ultrasonic device at various temperatures (30, 40, 50, and 60°C) and times (8, 16, 24, and 32 min). The experimental results showed that ultrasound positively contributed to acid hydrolysis process. The number-average molecular weight of the treated k-carrageenan was lower or the percentage of reduction was higher at lower pH, longer reaction time, and higher temperature. The lowest number-average molecular weight (14 kDa) or the highest percent of molecular weight reduction reduction (97.7%) was achieved after ultrasonic irradiation at 60°C and pH 3 for 32 min. Keywords: depolymerization; midpoint scission; ultrasonication

      PubDate: 2018-02-02
      DOI: 10.14710/reaktor.17.4.191-196
      Issue No: Vol. 17, No. 4 (2018)
       
  • KINETIC STUDY OF OIL PALM EMPTY FRUIT BUNCH ENZYMATIC HYDROLYSIS

    • Authors: Diah Meilany, Efri Mardawati, Made Tri Ari Penia Kresnowati, Tjandra Setiadi
      Pages: 197 - 202
      Abstract: As  lignocellulosic biomass, Oil Palm Empty Fruit Bunch (OPEFB) can be used as the source of xylose that can be further utilized as the raw material for xylitol production. The processing of OPEFB to xylose comprises of pretreatment and hydrolysis that can be performed enzymatically. This process offers the advantages of moderate operation conditions and more environmentally friendly. This article describes the kinetic study of enzymatic hydrolysis process of OPEFB for producing xylose using self-prepared and commercial xylanase enzymes. Despite the possible mass transfer limitation, the Michaelis Menten kinetics was hypothesized. The results indicated that the reaction at pH 5 and 60°C followed the Michaelis Menten kinetics,  with Vm of 0.84 g/L-h and Km of 48.5 g/L  for the commercial enzyme, and Vm of 0,38 g/L-h and Km of 0,37 g/L for the self-prepared enzyme. The reaction is affected by temperature, with Ea of 8.6 kcal/gmol. The performance of self-prepared xylanase enzyme was not yet as good as the commercial enzyme, Cellic Htec 2. Keywords: enzymatic hydrolysis; kinetics parameter; OPEFB; xylanase; xylose
      PubDate: 2018-02-02
      DOI: 10.14710/reaktor.17.4.197-202
      Issue No: Vol. 17, No. 4 (2018)
       
  • A Study of Compost as an Adsorbent for Congo Red Dye Removal Process

    • Authors: Gabriel Andari Kristanto, Ariessyawtra Raindra Lamurvie, William Koven
      Pages: 203 - 209
      Abstract: The human population continues to grow annually, and so does the number of textile industries. In textile industry, synthetic dye is one of the most polluting substance in its wastewate which the conventional treatment processes are usually ineffective. Another option is using activated carbon to remove the dye, but carbon is an expensive material. It is is interesting that  material that is rich in carbon, such as compost, may become an alternative solution. The objective of the present study was to assess the capability of compost in treating wastewater dye by determining the optimum compost dosage, particle size, and column height, while considering dye percentage removal and adsoprtion capacity. The optimum compost dosage was 8g/L and the optimum particle size was 1–2 mm in treating the 200 ppm Congo Red dye molecule, resulting in 20.49% removal and a 5.33 mg/g adsorption capacity. The optimum compost column height was 60 cm with 90% removal, and the adsorption capacity was 0.38 mg/g. The dye molecule wore off tthe compost, therefore fresh compost must be introduced in order to maintain its percentage removal level. The compatibility of isotherm model developed in this study with the Freundlich model is similar with previous studies.    Keywords: compost; congo red dye;adsorbent, batch, column 
      PubDate: 2018-02-02
      DOI: 10.14710/reaktor.17.4.203-209
      Issue No: Vol. 17, No. 4 (2018)
       
  • The Design of ACE (Aluminum Corrosion and Electrolysis) Reactor and Its
           Performance to Produce Hydrogen from Beverage Cans

    • Authors: Ahmad Zikri, Erlinawati ., Lety Trisnaliani, Daya Wulandari
      Pages: 210 - 214
      Abstract: Abstract
      The reaction of aluminum (Al) with an alkaline solution in producing hydrogen gas has been known for a long time. This aluminum corrosion reaction has a major obstacle in the passivation phenomenon, a formation of aluminum oxide coating on the metal surface that prevents aluminum from collapsing. Integration of electric current to the potassium hydroxide solution could result in electrolysis of water which increases the production of hydrogen. This process was carried out continuously in an ACE (aluminum corrosion and electrolysis) reactor of water. This reactor design enabled to produce hydrogen and oxygen in separating chamber. The use of 10 g of cans, 0.02 M gallium, 12 VDC, and 0.8 M KOH obtained the maximum production rate of hydrogen 162.58 ml/s with a purity of 79.83%. Keywords: aluminum corrosion; hydrogen; water electrolysis
      PubDate: 2018-02-02
      DOI: 10.14710/reaktor.17.4.210-214
      Issue No: Vol. 17, No. 4 (2018)
       
  • Encapsulation Rutin with Chitosan-NATPP Using Coaservation Method

    • Authors: Bambang Cahyono, Meiny Suzery, H Hadiyanto, Sestri Bela Pratiwi
      Pages: 215 - 220
      Abstract: Abstract This study aims to make microparticles of rutin compounds at various concentrations with NaTPP-chitosan as matrix. Encapsulation is done by coaservation method. The success of encapsulation was identified by UV-Vis spectrophotometry, Fourier Transform Infra-Red (FTIR) spectroscopy and Scanning electron microscopy (SEM). Based on UV-Vis spectrophotometry analysis, the efficiency of encapsulation (EE) and loading capacity (LC) was obtained at 62,43-94,36 and 1,73% -32,1%, at rutine concentration 0,625-11,25 mM. The success of rutin encapsulation is demonstrated by the rutin characteristics of the product seen with the presence of peaks of aromatic rings, indicating the presence of rutin compounds contained in the chitosan matrix. SEM analysis shows rough and porous surface morphology in microcapsules. The rutin release profile of the microcapsules is described as two phase processes, burst release at the initial discharge in the first 30 min followed by slow release. At the highest LC (11.25 mM concentration), it provides greater discharge rates for both synthetic fluid simulations 77.53 ± 3.59% and 78.76 ± 4.00% after 3h of discharge. The controlled release data showed high discharge rates at acidic pH than alkaline pH. Keywords: Rutin, encapsulation, citosan, coaservation
      PubDate: 2018-02-19
      DOI: 10.14710/reaktor.17.4.215-220
      Issue No: Vol. 17, No. 4 (2018)
       
  • THE EFFECTS OF WATER ADDITION AND STEAMING DURATION ON STARCH COMPOSITION
           OF WHEAT POLLARD

    • Authors: Cahya Setya Utama, Bambang Sulistiyanto, Sri Kismiati
      Pages: 221 - 225
      Abstract:  The objective of the study was to determine the effects of water addition and steaming duration on starch composition of wheat pollard including starch, amylose, amylopectin and starch resistant. Water was added towheat pollard (0, 30 and 60%) and autoclaved at 121°C (15 and 30 min) afterward. The pollard then was oven-dry at 70°C. The study used a complete randomized design of  3x2 factorial with 3 replications. The addition of water and steaming duration showed a very significant (p<0.001) impact on the amylose and starch resistant parameters but not the starch and amylopectin. The addition of water increased the starch content from 38.71+0.10%. The starch content of a 15-min autoclave was higher (44.54+11.34%) than that of a 30-min (43.43+11.16%).  The amylose levels decreased with addition of water and duration of autoclave. The amylose decrease from 5.23+0.10%  to 4.03+0.32%. Addition of water increased the amylopectin level from 33.50+0.10 to 52.90+0.70% while the amylopectin level was heated at 15 minutes (39.79+11.76%) and decreased to 39.20 + 11.44% after treatment with steam for 30 minutes. Addition of water increased the starch resistant level from 8.75+1.06% to 15.40+ 1.51% while heating for15 minutes had the highest starch resistant of 16.65+0.04% compare to the longer steaming deration. This result concluded that the addition of water and the duration of steam greatly affects the content of starch, amylose, amylopectin and starch resistant of the wheat pollard. The best results of this study was the addition of 30% moisture content with a steam duration of 15 minutes which results in the highest starch resistant of 16.65+ 0.04%. Keywords: wheat pollard; steam; moisture content; starch; amylose; starch resistant
      PubDate: 2018-02-19
      DOI: 10.14710/reaktor.17.4.221-225
      Issue No: Vol. 17, No. 4 (2018)
       
  • Synthesis of Titanium Dioxide (TiO2) Fine particle by Flame Spray
           Pyrolysis (FSP) Method using Liquid Petroleum Gas (LPG) as Fuel

    • Authors: Hendri Widiyandari, Agus Purwanto, Vincensius Gunawan, Susilo Adi Widyanto
      Pages: 226 - 230
      Abstract: This study aims to obtain titanium dioxide (TiO2) fine particle with a narrow size distribution by one step production via flame spray pyrolysis (FSP) using LPG (liquid petroleum gas) as a fuel source. The TiO2 particles were synthesized from the aqueous based precursor from dissolving of titanium (IV) isopropoxide to the acidic distilled water solvent. The effect of precursor concentration to the crystalline structure, morphology and size distribution of the TiO2 particles were systematically investigated. There were observed that the TiO2 has a uniform spherical shape with particle size around 200 – 500 nm. Increasing the precursor concentration resulted the size distribution shifted toward the bigger size. The crystalline structure of produced TiO2 showed the mixed phase of anatase and rutile and has a large specific surface area ~ 850,343 m²/g.
      PubDate: 2018-02-18
      DOI: 10.14710/reaktor.17.4.226-230
      Issue No: Vol. 17, No. 4 (2018)
       
  • Corrosion Characteristics of Carbon Steel upon Exposure to Biodiesel
           Synthesized from Used Frying Oil

    • Authors: Adhi Setiawan, Nora Amelia Novitrie, Agung Nugroho, W Widiyastuti
      Pages: 177 - 184
      Abstract: The use of biodiesel leads to corrosion of automotive material, which can potentially shorten engine lifetime. The study aims to investigate the effect of temperature and contact time on the corrosion characteristics of carbon steel upon exposure to biodiesel synthesized from used frying oil. The corrosion rate of carbon steel was analyzed based on weight loss measurement according to the standard of ASTM G31 as affected by temperature and contact time. The immersion temperatures used in this study were 30oC, 40oC, and 70o, respectively. The contact times studied were 30 days, 40 days, and 50 days respectively. The results show that the increase of temperature and contact time of biodiesel on carbon steel surface speeds up the corrosion rate. Maximum corrosion rate (0.083 mmy) was observed on the carbon steel contacted to biodiesel at 70oC for 50 days. The SEM results showed an irregular shape of the corroded carbon steel surface. XRD / FTIR analysis of carbon steel samples show the presence of peaks, detected as Fe2O3, FeO(OH) and Fe2O2CO3, as the corrosion products. Keywords: biodiesel; carbon steel; corrosion; FAME; used frying oil

      PubDate: 2017-12-02
      DOI: 10.14710/reaktor.17.4.177-184
      Issue No: Vol. 17, No. 4 (2017)
       
 
 
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