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All Journal Reaktor Jurnal Teknik ITS Jurnal Sains dan Seni ITS IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Afkaruna: Indonesian Interdisciplinary Journal of Islamic Studies Alchemy : Journal of Chemistry Jurnal Riset Kimia Indonesian Journal of Chemical Science Indonesian Journal of Chemistry Halal Research Journal Automotive Experiences Sewagati

Lukman Atmaja

Department Of Chemistry, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS, Keputih, Sukolilo, Surabaya, 60111

Author-ID : 236535

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Other

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Pembuatan dan Karakterisasi Film Pati Kulit Ari Singkong/Kitosan dengan Plasticizer Asam Oleat Wahyuningtyas, Meliana; Atmaja, Lukman
Indonesian Journal of Chemical Science Vol 5 No 1 (2016)
Publisher : Indonesian Journal of Chemical Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Penelitian tentang pembuatan dan karakterisasi film pati kulit ari singkong/kitosan dengan plasticizer asam oleat telah dilakukan. Pada penelitian ini, pati kulit ari singkong bertindak sebagai matriks, kitosan sebagai biopolimer pencampur dan asam oleat sebagai lipida. Formulasi larutan yang digunakan diberi nama sebagai berikut: CS75 OA 0%, CS60/CH15/OA 0%, CS45/CH30/OA 0%, CS37,5/CH37,5/OA 0%, CH75/OA 0%, CS75/OA 1%, CS60/CH15/OA 1%, CS45/CH30/OA 1%, CS37,5/CH37,5/OA 1%, dan CH75/OA 1%. CS merupakan pati kulit ari singkong, CH merupakan kitosan dan OA merupakan asam oleat. Asam oleat ditambahkan hingga mencapai konsentrasi akhir larutan sebesar 0% dan 1% (v/b). Film yang dibuat dikarakterisasi dengan Fourier Transform Infra Red (FTIR), Tensile Strenght dan analisa water uptake. Adapun hasil yang diperoleh dari penelitian ini adalah bahwa film kulit ari singkong/kitosan dengan plasticizer asam oleat memiliki penampakan visual transparan dan homogen. Hal ini mengindikasikan bahwa pati kulit ari singkong, kitosan dan asam oleat mampu berinteraksi dengan baik. Penambahan asam oleat hingga mencapai konsentrasi akhir larutan 1% (v/b) mempengaruhi sifat fisik film pada variasi tertentu, yaitu meningkatkan % elongasi, namun menurunkan nilai stress, nilai Modulus Young dan nilai water uptake secara signifikan.

Effect of Phosphotungstic Acid toward Composite Membrane for DMFC Application Suharini, Sri Endang; Permana, Dian; Atmaja, Lukman
IPTEK Journal of Proceedings Series No 1 (2015): 1st International Seminar on Science and Technology (ISST) 2015
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23546026.y2015i1.1152

Fuel cell consists of an electrolyte, which connected to the anode and cathode through a polyelectrolyte membrane in which the membrane is capable of delivering protons from the anode toward the cathode. The aim of this study is to know the effect of acid on the membrane composite phosphotungstic chitosan/montmorillonite-silane 10% of the ion exchange capacity, proton conductivity and methanol permeability using a variation of the 0; 0.5; 1.0; 1.5%, respectively. The additions of phosphotungstic acid increased the proton conductivity and ion exchange capacity. However, in this study, the highest proton conductivity on chitosan/ montmorillonite-silane 10%/1.0% phosphotungstic acid caused by a strong hydrophilic nature phosphotungstic acid.

Fabrication and Characterization of Chitosan/N-Phthaloyl Composite Membrane for DMFC Application Nugraeni, Christine Dyta; Atmaja, Lukman; Hayati, Nur; Purwanto, Mochammad; Santoso, Mardi; Kusumawati, Yuli
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.408

Modified chitosan membrane is one of the promising membranes for polymer electrolyte membrane. Chitosan/N-phthaloyl chitosan composite membranes were fabricated to obtain high proton conductivity and low methanol permeability. Membranes were fabricated by casting method and solvent evaporation. Surface morphology, mechanical analysis, methanol permeability, and proton conductivity were used to characterize the overall properties. FT-IR spectra exhibited the presence of interaction of chitosan and n-phthaloyl/chitosan. SEM analysis showed that the surface roughness of composite membrane increases as the n-phthaloyl loading increases. The highest proton conductivity of synthesized membrane is at 2.4 mS.cm-1 and is higher than pristine chitosan membrane at 1.6 mS.cm-1. Moreover, with n-phthaloyl/chitosan addition, the methanol permeability was also improved. The correlation between proton conductivity and methanol permeability in composite membranes suggests that the blend has its potential in DMFC application.

Metaphysics in the Epistemology : A Critical Analysis of Islamic and Western Philosophical tradition Lukman Atmaja; Ridho Ramazani Bin Cecep Mustopa
Afkaruna: Indonesian Interdisciplinary Journal of Islamic Studies Vol 16, No 1: June 2020
Publisher : Fakultas Agama Islam Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/AIIJIS.2020.0111.22-39

Western epistemology was greatly influenced by Greek philosophical ideas. In the course of history, Epistemology has been dominated by patterns of thought that are rational, secular and free from religious values and beliefs. History shows that the Western Epistemology turned into a large school that became dominant: in the form of rationalism, empiricism, criticism, and intuition. Although it has various methods and approaches to acquire knowledge, in principle the building and its foundation have the same way of thinking that comes from a philosophy that upholds the mind and also relies on human sensory abilities. The West denies revelation as a source of knowledge and for Islam, revelation is the highest source of knowledge. Authentic revelation is the Qur'an and Hadith. The result of this paper shows Western epistemology has a foundation and roots that are based on philosophical thinking that is far from the touch of religious values. Western epistemology in its manifestations is then limited to the acquisition of knowledge about the visible world such as sensory nature and not touching on other realms. Western epistemology focuses more on reason and senses as the main source of science, dichotomization, anthropocentrism, opposition to the spiritual dimension, relentless uncertainty, secularization, desacralization, and empiricism. While tthe Islamic epistemology views both sensory and metaphysical objects and recognizes the three sources of knowledge at once namely senses, reason, intuition. Each of these sources has different levels of ability so they cannot be separated and must be used proportionally. The object of knowledge in Islam is not only empirical, but also metaphysical. The source of knowledge in Islam is also different from Western epistemology. If the West only recognizes the senses and ratios, then in the Muslim view, knowledge comes from God obtained through: the senses are healthy, khabar sadiq, and intuition.

Physical and Chemical Properties of Gelatin from Red Snapper Scales : Temperature Effects Meliana Wahyuningtyas; Nurul Jadid; Perry Burhan; Lukman Atmaja
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

The extent of applications in various fields makes the need for gelatin continue to increase in the global market. Fish gelatin is an alternative to mammalian gelatin and its use is more universal because it can be consumed by all religious followers. The high variability of fish gelatin properties is caused by the availability of many extraction methods to obtain it. This preliminary study was carried out to find the optimum range of gelatin extraction procedures using Red Snapper scales because it had not been widely studied, although it was reported that gelatin yield was not significantly different from the bone and skin part. The optimum condition of the extraction procedure was obtained by pre-treatment using 5 % CH3COOH with extraction temperature of 60 °C which produces 58.19% swelling of fish scales and yield of gelatin is 8.76% with the moisture quality of 6.68%, pH of 6.225, viscosity of 15.54 cP and the melting point of 60 °C. The functional groups of gelatin was also successfully confirmed by FT-IR spectra.

Development of Activated Carbon Material from Oil Palm Empty Fruit Bunch for CO2 Adsorption Irsandi Dwi Oka Kurniawan; Randy Yusuf Kurniawan; Nurul Widiastuti; Lukman Atmaja; Anis Shofiyani
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

This study aims to determine the CO2 adsorption capacity of activated carbon doped with nitrogen. Activated carbon is carbonized from oil palm empty fruit bunches (OPEFB). The results of lignocellulose analysis from OPEFB, 42.87 wt% of hemicellulose, 27.31 wt% of lignin, 23.02 wt% of cellulose and 6.80 wt% of ash. Potassium hydroxide is used as an activating agent and urea as a nitrogen precursor with an OPEFB mass: urea is 1: 1 to 1: 5. The method used is single-step, where carbonization-activation-doping is made into one process. Activated activated carbon is characterized by Fourier-Transform Infrared (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) isotherm, and scanning electron microscope (SEM) with energy dispersive X-ray. Infrared spectra showed that N-doped activated carbon was successfully synthesized. Diffractogram shows an amorphous structure with graphitic plane (002) and (100). ACN11 produces the highest surface area of 1309.47 m2 g-1. The results of gravimetric CO2 adsorption at 30 °C and 1 atm conditions resulted in the largest CO2 adsorption capacity of ACN14 at 15.02 wt%. The ACN11 and ACN14 adsorption kinetics models followed the intraparticle diffusion model with R2 values of 0.95 and 0.97.

Pengaruh Konsentrasi Katalis Kalium Karbonat pada Proses Depolimerisasi Limbah Botol Plastik Polietilen Tereftalat (PET) Rosidatul Mahmudah Setyowati; Lukman Atmaja
Jurnal Sains dan Seni ITS Vol 1, No 1 (2012): Jurnal Sains dan Seni ITS (ISSN 2301-928X)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Proses depolimerisasi limbah botol plastik polietilen tereftalat (PET) berhasil dilakukan dengan melalui metode glikolisis dengan pereaksi etilen glikol dan katalis kalium karbonat. Glikolisis dilakukan selama 8 jam pada suhu 196°C. Katalis kalium karbonat divariasi melalui perbandingan mol PET:katalis. Perbandingan mol PET(unit berulang):katalis yang digunakan adalah sebesar 88:1, 78:1, 68:1, 58:1, 48:1, 38:1, 28:1 dan 18:1. Hasil PET yang berhasil terkonversi maksimal menjadi bis(hidroksietil) terftalat (BHET) dilaporkan pada perbandingan mol PET:katalis 28:1 yaitu sebesar 55,95%. BHET dari perbandingan mol 28:1 tersebut diidentifikasi menggunakan FTIR untuk mengkonfirmasi gugus-gugus OH–, C-O dan C=O. Titik leleh BHET sebesar 109,98°C didapatkan melalui analisis DSC/TGA.

Pengaruh Variasi Konsentrasi Metanol Terhadap Sifat Permeabilitas Metanol Membran Komposit Kitosan/ Monmorillonit Termodifikasi Silan 10% Diah Ayu Wulansari; Lukman Atmaja
Jurnal Sains dan Seni ITS Vol 5, No 2 (2016)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Membran komposit yang terdiri dari kitosan sebagai matriks dan monmorillonit sebagai telah berhasil dibuat. Kitosan yang digunakan dalam pembuatan membran memiliki derajat deasetilasi (DD) sebesar 70,225 %. Monmorillonit yang digunakan telah dimodifikasi dengan silan 10 %. Membran komposit tersebut dibuat untuk mengetahui sifat permeabilitas metanol pada lima variasi konsentrasi metanol yang digunakan. Konsentrasi metanol yang digunakan dalam penelitian ini adalah 1, 2, 3, 4, dan 5 M. Sifat – sifat membran yang dikarakterisasi yaitu gugus fungsi, water uptake, dan methanol uptake, sedangkan uji kinerja membran dilakukan dengan pengukuran permeabilitas metanol. Nilai permeabilitas yang diperoleh semakin menurun seiring dengan meningkatnya konsentrasi metanol yang digunakan. Permeabilitas metanol tertinggi yang diperoleh sebesar 4,7771 x 10-5 cm2/s pada konsentrasi 1 M dan 2 M, sedangkan nilai permeablitas metanol terendah sebesar 1,9108 x 10-5 cm2/s pada konsentrasi metanol 5 M.

Fabrication and Characterization of Chitosan/N-Phthaloyl Composite Membrane for DMFC Application Christine Dyta Nugraeni; Lukman Atmaja; Nur Hayati; Mochammad Purwanto; Mardi Santoso; Yuli Kusumawati
Jurnal Riset Kimia Vol. 12 No. 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.408

Valorisation of Shrimp Waste into Chitosan/Montmorillonite-Sulfosuccinic Acid Composite Membrane for DMFC Application Shalahudin Nur Ayyubi; Lukman Atmaja; Aprilina Purbasari
Reaktor Volume 21 No.4 December 2021
Publisher : Dept. of Chemical Engineering, Diponegoro University

Composite membranes have been synthesized from biopolymer chitosan (CS) and nanosized montmorillonite (MMT) filler crosslinked with sulfosuccinic acid (SSA) as an alternative membrane electrolyte for direct methanol fuel cell (DMFC) application. All prepared membranes were obtained by solution casting technique. Prepared membranes were systematically characterized in terms of water uptake, methanol uptake, and methanol permeability as membrane performance parameter for DMFC applications. Fourier transform infrared spectroscopy was used to confirm the structures of the CS/MMT-SSA composite electrolyte membranes. The addition of sulfosuccinic acid evidently decreased the value of methanol permeability with the lowest value of 2.9973 × 10-7 cm2/s was obtained from CS/MMT-SSA 16% membrane. The addition of sulfosuccinic acid also decreased the absorption of methanol with the lowest value of 45.9459% while the water absorption of 53.6424% occurred in the membrane with the addition of 16% sulfosuccinic acid. As a result, the CS/MMT-SSA composite membrane appears to be a potential candidate for the DMFC applications.Keywords: direct methanol fuel cell; proton exchange membrane; methanol permeability; chitosan

Co-Authors Abdul Wafi Adityo Pratomo Putro Afifah Rosyidah Ananda Krisna Aldianita Anggaria Maharani Anisa Rahma Maharani Aprilina Purbasari Ardi Lukman Hakim Aunurohim Aunurohim Ã–zer, Salih Bambang Sudarmanta Bambang Sudarmanta, Bambang Cicilia Puspa Rini Dheva Noveilya Diah Ayu Wulansari Dian Permana Dian Permana Dian Permana Didik Prasetyoko Fiqey Indriati Eka Sari Hamzah Fansuri Hendro Juwono Herdayanto Sulistyo Putro Herianus Manimoy Imelda Priskila Simanjuntak Irsandi Dwi Oka Kurniawan Irsandi Dwi Oka Kurniawan Kusumawati, Yuly La Ode Ahmad Nur Ramadhan Lina Eka Arizka Linda Wati Oktavia M Daffa Aditya Mardi Santoso Meliana Wahyuningtyas Meliana Wahyuningtyas, Meliana Mochammad Purwanto Muhammad Nur Kholis Muhammad Nur Kholis Muhammad Purwanto Nabilah Dita Anaqah Nanik Ismi Oktavianti Ni Kadek Githa Kartika Gunadyani Nor Farida Nugraeni, Christine Dyta Nur Hadi Nur Hayati Nur Hayati Nur Izzati Abu Bakar Nurul - Widiastuti Nurul Jadid Purwanto, Mochammad R.Y. Perry Burhan, R.Y. Perry Randy Yusuf Kurniawan Retno Rahayu Dinararum Ridho Ramazani Bin Cecep Mustopa Rosid Rosid Rosid Rosid, Rosid Rosidatul Mahmudah Setyowati Ruzain Rafie Sukma Putra Salih Özer Shalahudin Nur Ayyubi Shofiyani, Anis Sudir Umar Suharini, Sri Endang Susi Agustina Wilujeng Susy Budi Astuti Taslim Ersam Vanuella Tresnaning Budi Yaqdhan Nufal Rafi Yatim Lailun Ni’mah Yuli Kusumawati Yuli Kusumawati

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