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72 results on '"Suprapto"'

3. Preliminary study on tandem electrostatic accelerator for the ion accelerator facility at the research center for accelerator technology, ORTN BRIN

Author

Pudjorahardjo, Djoko Slamet, primary, Kambali, Imam, additional, Sujitno, Tjipto, additional, Suprapto, Suprapto, additional, Andriyanti, Wiwien, additional, Febrianto, Isdandy Rezki, additional, Saputra, Angga Dwi, additional, Kartika, Bayu Mahdi, additional, and Harumningtyas, Anjar Anggraini, additional

Published
2024
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5. An optimization of irradiation vessel for RVNRL using ARJUNA 1.0 electron accelerator

Author

Adabiah, Suhadah Rabi’atul, primary, Nuraini, Elin, additional, Andriyanti, Wiwien, additional, Saefurrochman, Saefurrochman, additional, Prabasiwi, Devi Swasti, additional, Arini, Dewi Puspa, additional, Sukaryono, Sukaryono, additional, Wijayanto, Agus, additional, Dwiatmaja, Agus, additional, Anggraeni, Karina, additional, Sutadi, Sutadi, additional, Poernomo, Herry, additional, Suprapto, Suprapto, additional, and Darsono, Darsono, additional

Published
2024
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44. Extraction and purification of bromelain enzyme from queen pineapple

Author

A. Elyfianti Kholifatur, Odina Nadya Sari, Lily Pudjiastuti, Wahyu Tri Amaliah Provito, Warlinda Eka Triastuti, Suprapto Suprapto, and Achmad Ferdiansyah Pradana Putra

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Ammonium sulfate, Chromatography, Ethanol, Membrane, chemistry, Bromelain (pharmacology), Extraction (chemistry), Ultrafiltration, Salt (chemistry), Ammonium
Abstract

The purpose of this study is to produce bromelain powder from extract of pineapples. Bromelain enzyme extracted by enzyme isolation method then purified by ammonium sulphate salt, ethanol and ultrafiltration membranes. Then filtering and drying is done using a vacuum dryer. The variables of ammonium sulfate salt concentrations are 10%, 15%, 20%, 25%, and 30%. The properties and bromelain activity of the pineapple extract was determined. The best result of bromelain enzyme powder from pineapple were precipitated by ammonium sulphate 15%, and ethanol 5% using membranes with activity enzyme are 0,658 U / gr and protein content were 2,03%.

Published
2021

45. Synthesis and characterization of thermosensitive-ionic based gel in various temperatures

Author

Eva Oktavia Ningrum, Achmad Dwitama Karisma, Suprapto Suprapto, Ely Agustiani, and Hikmatun Ni’mah

Subjects
Cationic polymerization, chemistry.chemical_element, Metal, Chromium, Nickel, Adsorption, chemistry, Chemical engineering, Polymerization, visual_art, Copolymer, medicine, visual_art.visual_art_medium, Swelling, medicine.symptom
Abstract

The rapid development of technology in industry produces heavy metals waste which identified as B3 waste, thus management is needed to maintain the ecosystem and life around it. One of the industries which needs B3 waste management is electroplating industry. The acidic effluent from electroplating industrial contains heavy metals like chromium, nickel, and cadmium. Waste containing heavy metals can be regenerated through varied methods, one of them is by utilizing zwitterion betaine gel. However, the weakness of this method is the presence of intra-intra chain association so that the ionic group ability to adsorb the ion is inhibited by the charge group interaction. Therefore, in this research, the intra-intra chain of these gels were minimalized by synthetizing anionic and cationic gel separately using NIPAM-co-Chi and NIPAM-co-AAc copolymer. NIPAM-co-Chi and NIPAM-co-AAc gels were synthetized through polymerization reaction using N,N’-methylenebisacrylamide (MBAA) as the cross linker with NIPAM-co-Chi and NIPAM-co-AAc concentration ratio of 8:2 at various syntesis temperatures. Heavy metal adsorbed simultaneously by the charge group in gel. Several analysis were done to investigate the characteristic of the gel produced, including FTIR, swelling degree, gel morphology through SEM. Based on the FTIR analysis result on NIPAM-co-Chi and NIPAM-co-AAc gels, only a few vinyl group seen on its functional group, so that it can be conclude that the synthesis of the gel copolymer was successfully carried out. The highest swelling degree on NIPAM-co-Chi was at synthesis temperature of 10 °C, while on NIPAM-co-AAc was at synthesis temperature of 30 °C. The lowest swelling degree on NIPAM-co-Chi was at synthesis temperature of 70 °C, while on NIPAM-co-AAc was at synthesis temperature of 70 °C. Furthermore, based on SEM result, porous was found on both gels at synthesis temperatures of 30 °C, 50 °C, and 70 °C.

Published
2021

46. The optimization of Sumbawa manganese ore beneficiation using response surface method (RSM)

Author

Alfikri Khair, Yatim Lailun Ni’mah, Suprapto Suprapto, and Haryudini Arsa Putri

Subjects
inorganic chemicals, Materials science, Metallurgy, technology, industry, and agriculture, chemistry.chemical_element, Beneficiation, Sulfuric acid, Manganese, equipment and supplies, complex mixtures, Lithium-ion battery, chemistry.chemical_compound, chemistry, Yield (chemistry), Lithium manganese oxide, Leaching (metallurgy), Response surface methodology
Abstract

The beneficiation of manganese ore from Sumbawa, West Nusa Tenggara, Indonesia has been carried out by leaching method using sulfuric acid (H2SO4). The effects of sulfuric acid concentration, leaching temperature, and reaction time were optimized. The leaching parameters were set based on Box-Behnken Design and optimized using Response Surface Methodology (RSM). The beneficiation product was prepared for the synthesis of lithium manganese oxide (LiMn2O4) that will be applied as lithium ion battery cathode material. X-Ray Flouroscense (XRF), X-Ray Diffraction (XRD) and Atomic Absoption Spectroscopy (AAS) were performed for characterization of manganese ore and lithium manganese oxide that obtained. The optimum of manganese ore leaching yield was 79.57%. The optimum yield was produced by leaching of manganese ore in sulfuric acid 2.5 M, leaching temperature of 70 °C and leaching time of 9 hours.

Published
2021

48. The adsorption of remasol, indigosol and naphtol yellow mixed dyes using activated carbon

Author

Ita Ulfin, Suprapto Suprapto, Fredy Kurniawan, Djarot Sugiarso, Hendro Juwono, Harmami Harmami, Yatim Lailun Ni’mah, and Ivva Rohmawati

Subjects
021110 strategic, defence & security studies, Contact time, Chemistry, 0211 other engineering and technologies, 02 engineering and technology, Water stream, 021001 nanoscience & nanotechnology, Adsorption, Adsorption method, medicine, Response surface methodology, 0210 nano-technology, Activated carbon, medicine.drug, Nuclear chemistry
Abstract

The adsorption of remasol yellow, indigosol yellow, and naphtol yellow using activated carbon has been carried out. Batik dye poses some environmental problem when disposed directly to the water stream. The adsorption method is one of the effective methods that can decrease the concentrations of batik dyes such as remasol yellow, indigosol yellow, and naphtol yellow. These dyes were mixed as an artificial solution to investigate the adsorption conditions that can be applied in the processing of batik dye waste before disposed to the environment. The parameters that optimized in the adsorption of the dyes were variations in contact time, adsorbent dosage, and initial concentration. The preliminary study was conducted using Response Surface Methodology (RSM) with Box-Behnken design to optimize the adsorption parameters. The optimum contact time, adsorbent dosage, and initial concentrations obtained from RSM were 47.5-60 minutes; 8.5-12 mg; and 50-100 mg/L, respectively. The optimum condition for adsorption in this research were obtained at contact time 50 minutes with %Removal of each dye were 74.73%; 90.57%; and 93.50%; adsorbent dose 16 mg with %Removal of each dye was 74.61%; 89.22%; 92.32%; and the initial concentration of each dye was 25 mg/L with %Removal of each dyes 69.48%; 69.15%; and 75.08%. The maximum adsorption capacity of each dye was 40.38; 54.18; and 83.12 mg/g.

Published
2020

49. Optimization of aluminum recovery from aluminum smelting waste using the surface response methodology

Author

Harmami Harmami, Fredy Kurniawan, Ita Ulfin, Gayu Septiandini, Suprapto Suprapto, Yatim Lailun Ni’mah, Djarot Sugiarso, Kiki Cahayati Hidayatulloh, and Hendro Juwono

Subjects
inorganic chemicals, Liquid ratio, Materials science, Aluminium smelting, Metallurgy, 0211 other engineering and technologies, chemistry.chemical_element, Environmental pollution, 02 engineering and technology, 010501 environmental sciences, complex mixtures, 01 natural sciences, Corrosion, chemistry, Aluminium, Smelting, Surface response methodology, Response surface methodology, 021102 mining & metallurgy, 0105 earth and related environmental sciences
Abstract

The aluminum smelting process produces a large number of by-products, known as slags that can be reused for landfill or dumped into landfills. Smelting waste contains aluminum in the form of alumina at high concentration (around 30%). Direct disposal of this waste into the environment can cause environmental pollution. Aluminum in the waste can react with water and produce corrosion products. Therefore, this study explores the potential for recovering aluminum from smelting waste using an acid leaching process. The efficiency evaluation of aluminum recovery was carried out by optimizing using Response Surface Methodology (RSM) with Box-Behnken Design. Optimization results show that aluminum recovery increases with increasing temperature and heating time. The acid concentration and the ratio of solid to liquid showed an initial increase followed by a reduction in recovery with an increase in concentration and a solid- liquid ratio. RSM predicts that aluminum recovery can reach optimum when heated at 50 °C for 6 hours and 1.5 ratio of solid/liquid using 2 M acid concentration.

Published
2020

50. Monitoring the quality of the cooking oil and raw foods used in canteens in Sepuluh Nopember Institute of Technology to achieve health stalls

Author

Ita Ulfin, Siti Safira Nur, Fredy Kurniawan, Hendro Juwono, Djarot Sugiarso, Dwa Desa Warnana, Hana Yosinta Maria, Tiara Mahendra Kurniawati, Harmami Harmami, Yatim Lailatul Ni’mah, and Suprapto Suprapto

Subjects
Agricultural science, Cooking oil, Healthy food, media_common.quotation_subject, Geomatics engineering, Quality (business), media_common
Abstract

Sepuluh Nopember Institute of Technology (ITS) has 4 canteens that are managed by the ITS Public Facilities Unit to fulfill the food and drink needs of students, lecturers, and other employees. There are Biology canteen, Information System canteen, Geomatics Engineering canteen, and Central canteen that have many foods and beverages stalls. To ensure the quality of food in the canteen, the quality of the foods’ raw materials will be tested. Some parameters tested are free fatty acid value analysis (FFA), peroxide value analysis (PY), and formaldehyde qualitative test. The analysis results are compared with the national standards (SNI 01-3741-2013). From 28 stalls that were sampled, only 9 stalls passed the test. Later, the stalls that passed the test has been labeled Healty Food Stalls Built By LPPM ITS (Warung Sehat Binaan LPPM ITS) in the form of stickers and those who have not passed will be given training in how to process healthy food and retest after training.

Published
2020

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