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All Journal Reaktor International Journal of Science and Engineering (IJSE) International Journal of Renewable Energy Development METANA JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Waste Technology World Chemical Engineering Journal Indonesian Journal of Biotechnology Jurnal Aplikasi Teknologi Pangan Syntax Literate: Jurnal Ilmiah Indonesia Indonesian Journal of Chemistry ASEAN Journal of Chemical Engineering ASEAN Journal of Community Engagement Journal of Vocational Studies on Applied Research

Siswo Sumardiono

Department Of Chemical Engineering, Diponegoro University, Jl. Prof. Soedarto SH, Tembalang, Semarang 50275, Central Java, Indonesia

Author-ID : 391954

Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Public Health Social Sciences Other

Published : 31 Documents Claim Missing Document

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Title

Effect of Esterification on Cassava Starch: Physicochemical Properties and Expansion Ability Siswo Sumardiono; Listiyana Riska; Bakti Jos; Isti Pudjiastuti
Reaktor Volume 19 No. 1 March 2019
Publisher : Dept. of Chemical Engineering, Diponegoro University

In this study, the characteristic of cassava starch have been developed through esterification reaction using ethyl lactate. Commercial cassava starch was modified by using (0.5; 0.75; 1.00; 1.25; 1.50 % v/v) ethyl lactate solution with pH 6, 7, 8, 9 for 15, 25, 35, 45, 55 minutes and the drained starch was dried with sun drying. The cassava starch which has been esterified with 1.5% ethyl lactate for 15 minutes pH 6 gave highest volume expansion of 2,438.9 %. For swelling power, the highest value was 19.32 swelling power at variable concentrations of 1.5% ester, esterification period of 15 minutes, and pH 6. The lowest amylose content was 15.68 % in ester concentration of 1.5 %. From the scanning electron micrograph, shows that the cassava starch after and before modification has not changed since the modifications performed under the gelatinization temperature. FTIR spectra of native cassava starch and ester cassava starch shown shift of the carboxyl group of starch from 1072.37 to 1087.80 cm-1 and a decrease in the OH group is from 3452.53 to 3417.81 cm-1. Bond formed indicates that the esterification reaction occurs between cassava starch with ethyl lactate esters. Keywords: volume expansion, cassava starch, ester starch, ethyle lactate, modified starch

ULTRAFILTRATION AS PRETREATMENT OF REVERSE OSMOSIS: LOW FOULING ULTRAFILTRATION MEMBRANE PREPARED FROM POLYETHERSULFONE–AMPHIPHILIC BLOCK COPOLYMER BLEND Heru Susanto; Luqman Buchori; Siswo Sumardiono; Berkah Fajar; Titik Istirokhatun; I Nyoman Widiasa
Reaktor Volume 12, Nomor 4, Desember 2009
Publisher : Dept. of Chemical Engineering, Diponegoro University

This paper demonstrates the preparation of polyethersulfone (PES) ultrafiltration (UF) membranes via wet phase inversion method using either poly(ethylene oxide)-b-poly(propylene oxide)-b- poly(ethylene oxide) (Pluronic®, Plu) or polyethylene glycol (PEG) as hydrophilic modifier. Their effects on membrane structure as well as the resulting membrane performance and their stability in membrane polymer matrix were systematically investigated. The investigated membrane characteristics include surface hydrophilicity (by contact angle), surface chemistry (by FTIR spectroscopy) and water flux measurement. Visualization of membrane surface and cross section morphology was also done by scanning electron microscopy. The membrane performance was examined by investigation of adsorptive fouling and ultrafiltration using solution of bovine serum albumin as the model system. The stability of additive was examined by incubating the membrane in water (40oC) for up to 10 days. The results show that modification effects on membrane characteristic and low fouling behavior were clearly observed. Further, amphiphilic Pluronic generally showed better performance than PEG.

Adsorption Photocatalytic Removal of Rhodamine B using Dodecyl Dimethyl Betaine (BS12) Intercalated Silver Tetratungstate-Bentonite composites: Effect of Ag and Surfactant Loading, pH, and its Subsequent Economic Feasibility Sumardiono, Siswo; Setiawan, Fajar Kasih; Jos, Bakti; Cahyono, Heri
Reaktor Volume 25 No.1 April 2025
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.25.1.%p

The potential of silver tetratungstate-doped bentonite intercalated with zwitterionic surfactant for removing Rhodamine B (RhB) was evaluated by comparing three composites, namely, AB (acid-activated bentonite), AB impregnated with Ag8W4O16 photocatalyst (Ag@AB), and Ag@AB intercalated with dodecyl dimethyl betaine (BS12) surfactant (Ag@OAB) with respect to their photocatalytic adsorption performance. The AB composite was prepared by treating natural bentonite with hydrochloric acid (HCl). Next, Ag@AB was synthesized by wet impregnation of Ag₈W₄O₁₆ onto AB. Lastly, the Ag@OAB was formed by intercalating the BS12 surfactant onto the Ag@AB composite. The morphology of the composite structures was characterized using Scanning Electron Microscopy (SEM). The addition of 4% Ag (w/w) tetratungstate W4O16 and 50% CEC BS12 to AB produced RhB removal percentages of 66% and 59%, respectively, compared to 65% for AB. The maximum removal percentage was achieved at pH 4 for the AB, Ag@AB, and Ag@OAB composites with RhB removal percentages of 67%, 71%, and 44%, respectively. The AB composite showed the highest regenerative ability compared to Ag@AB and Ag@OAB, with AB maintaining RhB removal at 70% after five regeneration cycles, while Ag@AB and Ag@OAB only reached four and three regeneration cycles. The total production cost of AB is fourteen to sixteen times lower than that of Ag@AB and Ag@OAB composites. In summary, the impregnation of the Ag₈W₄O₁₆ photocatalyst onto AB, resulting in the Ag@AB composite, increases the RhB removal efficiency compared to pristine AB. In contrast, the intercalation of the BS12 surfactant in Ag@OAB composite led to a decrease in RhB removal efficiency, resulting in the lowest performance among the three composites.

Co-Authors A Abdullah Abdullah Farhan Agus Hadiyarto Andhika Cahaya Titisan Sukma Annisa Kusumaningrum Annisa Kusumaningrum Aulia Rahman Majid Awaliyah, Fiky Zakiyatul B Budiyono Bakti Jos Bakti Jos Berkah Fajar Budiyono Budiyono Desti Permata Sari Devi Marietta Siregar Dhiya’ulhaq, Syaikha Butsaina Edy Supriyo Fahmi Arifan Fauzi, Ihwan Ferry Nanda Ardhianto Fofana, Fadillah Fathir Mahmud Gita Permana Putra Herawati Oktavianty Heri Cahyono Heri Cahyono Hermawan Dwi Ariyanto Heru Susanto I Nyoman Widiasa Ilmi, Nurika Nazilatul Iqbal Syaichurrozi Isti Pudjiastuti Isti Pudjihastuti Ivan Aditya Gunawan Listiyana Riska Listiyana Riska Luqman Buchori Maria Octoviane Dyan Mayang Gitta Pawitra Meganingtyas, Wahyudita Muchlis Riki Darmawan Nearya Sondang Novitasari, Arsy Patrick Andreas Prihatmoko, Widi Purwoko, Agus R.P. Djoko Murwono Rahim Arlanta S Rizka Amalia Rizki B Rakhmawati Setiawan, Fajar Kasih Siswanto, Anggun Puspitarini Sunarso . Titik Istirokhatun Tutuk Djoko Kusworo Y Yufidani

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