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All Journal Reaktor International Journal of Renewable Energy Development TEKNIK Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan DIPOIPTEKS: Jurnal Ilmiah Mahasiswa Undip Bulletin of Chemical Reaction Engineering & Catalysis Seminar Nasional Teknik Kimia Kejuangan Prosiding Semnastek Jurnal Penelitian Pertanian Terapan Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Jurnal Civil Engineering Study International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis
Titik Istirokhatun
Department Of Environmental Engineering, Faculty Of Engineering, Diponegoro University, Jl. Prof. Soedarto, Kampus UNDIP Tembalang, Semarang 50275
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Preparation and Characterization of Zeolite Membrane for Bioethanol Purification Aprilina Purbasari; Titik Istirokhatun; Ariestya Meta Devi; Lulluil Mahsunnah; Heru Susanto
Bulletin of Chemical Reaction Engineering & Catalysis 2013: BCREC Volume 8 Issue 1 Year 2013 (June 2013)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.8.1.4062.47-53

Abstract

The use of bioethanol as an alternative fuel with a purity of more than 99.5% wt has prompted research on bioethanol purification. One of the promising methods used for bioethanol purification is pervaporation membrane. This research is aimed to prepare and characterize zeolite membranes for pervaporation membrane. The membrane preparation consisted of two stages, namely support preparation and zeolite deposition on the support. In support preparation, α- alumina and kaolin with specific composition (50:30; 40:40; 50:30) was mixed with additives and water. After pugging and aging process, the mixture became paste and extruded into tubular shape. The tube was then calcined at temperature of 1250 °C for 3 hours. After that, zeolite 4A was deposited on the tubes using clear solution made of 10 %wt zeolite and 90 %wt water and heated at temperature of 80 °C for 3 hours. Furthermore, the resulting zeolite membranes was washed with deionized water for 5 minutes and dried in oven at temperature of 100 °C for 24 hours. Characterization of zeolite membranes included mechanical strength test, XRD, and SEM. In the mechanical strength test, the membrane sample with α- alumina:kaolin = 50:30 (membrane A) has the highest mechanical strength of 46.65 N/mm2. Result of XRD analysis for the membrane A indicated that mullite and corundum phases were formed, which mullite phase was more dominant. Meanwhile the result of SEM analysis shows that zeolite crystals have been formed and covered the pores support, but the deposition of zeolite has not been optimal yet. The performance examination for bioethanol purification showed that the membrane could increase the purity of bioethanol from 95% to 98.5% wt. © 2013 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0)
Pengaruh Kapasitas Penampungan Air terhadap Hasil Pengomposan Sampah Pasar Organik Destiasari, Ajeng; Sumiyati, Sri; Istirokhatun, Titik
Jurnal Penelitian Pertanian Terapan Vol 23 No 4 (2023)
Publisher : Politeknik Negeri Lampung.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25181/jppt.v23i4.3263

Abstract

The increasing volume of market waste that continues to occur makes people think negatively of waste, but on the other hand waste can provide positive things by composting. The purpose of this research is to analyze the content of Water Holding Capacity (WHC) in organic compost made from market waste. The composting process uses the Open Windrow method with aerobic Composting Bag container media. Composting was carried out for fifteen days with variations in the addition of bioactivators to accelerate the maturation of different composts are 50 ml, 75 ml, 100 ml, 125 ml, and 150 ml with one control compost. The bioactivator used is a type of local microorganism (MOL) made from market waste. Based on the results of this study, compost with a variation of 150 ml bioactivator addition produced an optimal WHC content of 75%, the best water content of 49.24%, C/N 15.57%, temperature 32.29°C, and pH 7.
An Overview of the Utilization of PET Plastic Bottle Waste for Membrane Fabrication Istirokhatun, Titik; Siahaan, Samuel Ezra; Gonzales, Ralph Rolly; Andarani, Pertiwi; Susanto, Heru; Filardli, Abdullah Malik Islam
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 22, No 1 (2025): March 2025
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v22i1.15-37

Abstract

Plastic use, in this case including plastic drinking water bottles particularly polyethylene terephthalate (PET) has resulted in significant environmental, social, economic, and health repercussions. It will ultimately be deposited in landfills, requiring up to 1,000 years for each individual bottle to degrade. This review begins by briefly introducing the composition and characteristics of PET. It then details the methods for converting waste PET into valuable materials for diverse applications. The review emphasizes advanced uses of these materials in water treatment, highlighting the development of robust, organic solvent-resistant membranes. The primary aim of this review is to evaluate recent studies of PET bottle recycling to membrane technologies, membrane fabrication from PET waste, applications of PET-based membranes, advantages and challenges of using PET waste for membrane fabrication.
Kajian Desain Fender Di Pelabuhan Benoa Bali Sesuai British Standart 6349-2014 Budiono Joko Nugroho; Istirokhatun, Titik; Sumardi
Jurnal Civil Engineering Study Vol. 5 No. 01 (2025): Jurnal Civil Engineering Study
Publisher : Civil Engineering of Universitas Islam Nahdlatul Ulama Jepara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34001/ces.v5i01.1304

Abstract

Fenders in dock buildings are damage prevention when ships dock at the dock. The fender design must be appropriate so that it can absorb impact energy. The amount of energy absorbed and the maximum force transmitted to the dock structure are used to determine the type and size of the fender. At Benoa Pier Bali where long cruise ships are anchored, a larger fender design is required. There are various methods for determining fender design, one of which uses British Standard 6349-2014 part 4: Code of practice for design of fendering and mooring systems. PT. Pelabuhan Indonesia as a port operator in Indonesia has historically used various fender design methods. The use of British Standard 6349 - 2014 has various advantages in designing a fender, where various factors influence the selection of fenders such as wave conditions, currents, wind, ship size, speed and direction of the ship when anchored at the dock. The SSCnF Cone 1100 + Frontal Frame fender is used according to the calculation results using BS 6349 - 2014.
Microplastics Removal Strategies in Aquatic Environments Widiyanto, Edhi; Istirokhatun, Titik; Andarani, Pertiwi; Susanto, Heru; Desiriani, Ria; Apriliana, Pamella
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 22, No 3 (2025): November 2025
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v22i3.688-711

Abstract

Microplastics (MPs) have been globally detected in aquatic environments. The abundance of MPs contributed to the negative effects on aquatic ecosystems. Thus, it’s critical to create effective solutions for removing MPs from water. In this review, we compared several methods, including physical, physicochemical, and biological approaches, towards membrane filtration. The physical filtration technology is the simplest way in comparison with other methods. However, the removal ability of physical filtration against smaller MPs than 20 ?m becomes a crucial concern. Then, the other option is an adsorption method. Although the adsorption option is an inexpensive method, the undesirable aspect during adsorbent usage may not be environmentally friendly in aquatic systems. The similar problem is also demonstrated by chemical approaches in terms of coagulation and electrocoagulation treatment. Consequently, the biological methods were found to be less toxic to the environment. Even though it provides safe conditions to the environment, the biological approach needs a long time to degrade MPs. To overcome their disadvantages, the membrane technology offers efficient removal of MPs and no addition of chemical usage. However, the main point to pay attention to is that each technology has benefits and drawbacks. Therefore, the application of multiple technologies for MPs removal is considered. 
Co-Authors Akhmad Masykur Hadi Musthofa Ananda Dwi Utomo Apriliana, Pamella Aprilina Purbasari Apriyanti, Dwi Titik Ariestya Meta Devi Asep Muhamad Samsudin Asep Muhamad Samsudin, Asep Muhamad Aulia, Mustika Azaria Primelya Bambang Pramudono Berkah Fajar Budiono Joko Nugroho Desiriani, Ria Destiasari, Ajeng Dwi Titik Apriyanti Dyah Ayu Kresnianingrum Elaeis Noviani R. Elaeis Noviani R. Elaeis Noviani Ratnasari, Elaeis Noviani Endro Sutrisno Fajar S. S Nur Filardli, Abdullah Malik Islam Fiorentina Sinurat Gonzales, Ralph Rolly Hamada, Nur ?Aini Haryono Setiyo Huboyo Heny Kusumayanti Heru Susanto I Nyoman Widiasa Irawan Wisnu Wardhan Ita Tetriana A. Ita Tetriana A. Ita Tetriana Agustini Kiki Ramayana L. Tobing Kiki Ramayana L. Tobing Lidiya Novelendah Lulluil Mahsunnah Luqman Buchori Luthfi Kurnia Dewi M Husen Senoaji Mohammad Sulchan Nur Rokhati Nur Rokhati Nur ‘Aini Hamada Nurandani Hardyanti Nurfaiz, Agus Oktiawan Wiharyanto Pertiwi Andarani Purwono Purwono, Purwono Ramadan, Bimastyaji Surya Reisa Novita Marpaung Siahaan, Samuel Ezra Siswo Sumardiono Sri Sumiyati Sudarno Sudarno Sudarno utomo Sumardi Widiyanto, Edhi Wiharyanto Oktiawan Winardi Dwi Nugraha