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All Journal Jurnal Matematika & Sains Molekul: Jurnal Ilmiah Kimia Nusantara Science and Technology Proceedings Prosiding University Research Colloquium Gunung Djati Conference Series Jurnal Kimia dan Rekayasa West Science Nature and Technology
Hamid Hamid
Universitas Muhammadiyah Surakarta
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Other

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Sintesis dan Karakteristik Membran Komposit Akrilonitril Butadiena Stirena (ABS)-Kitosan Tersulfonasi untuk Direct Metanol Fuel Cell (DMFC) Hidayati, Nur; Mujiburohman, Muhammad; Abdillah, Hamid; Harmoko, Tri; Arimurti, Rizki Dyah
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

Direct Methanol Fuel Cell (DMFC) is a type of fuel cell that converts methanol directly into electrical energy. The commercialization constraints of fuel cells in Indonesia is due to the high cost of manufacturing, including the expensive electrolyte membrane which is one of the important components of fuel cells. Utilization of cheap and abundant local materials such as acrylonitrile butadiene styrene (ABS) and chitosan can reduce the fuel cell manufacturing cost burden. The membrane currently used for DMFC is the Nafion® membrane. The superiority of Nafion® membrane has high ionic conductivity and membrane stability, while Nafion® membrane deficiency is a very expensive price and has a high enough methanol permeability that can lead to a decrease in overall cell voltage performance. This study studied the characteristics of ABS-sulfonated Chitosan membrane membrane with ratio (20:80) and (40:60) prepared on 6-hour, 12 hour, 18 hour, 24 hour sulphonation time variation. The experimental results show a sulfonation time of 24 hours, in the ratio of ABS: Chitosan (20:80 wt) provides membrane characteristics such as water uptake 48.50%, swelling degree 25%, ion exchange chamber 2.030 meq / g, and methanol permeability 2,9336x10 -6 cm2 / s.
Pyrolysis Process of Mixed Polypropylene (PP) and High-Density Polyethylene (HDPE) Waste with Natural Zeolite as Catalyst Emi Erawati; Hamid Hamid; Annisa Ayu Ilma
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1280 KB) | DOI: 10.20884/1.jm.2018.13.2.400

Abstract

The reactor of the experiment was made from stainless steel with the diameter of 25 cm and the height of 30 cm.  The liquid petroleum gas was used as a fuel in the reactor. The reactor was connected by the thermocouple that controls temperature variations at 410, 420, 430, and 450ºC. Raw material contained plastic bottles and waste caps, while the natural zeolite as a catalyst was dried and cut in dimensions of 3x3 cm. A gas as the reacted product was condensed using the first condenser, then the liquid product was collected. Uncondensed gaswas condensed again in the second condenser, then the liquid product was collected again. The volume of gas was calculated based on the water volume coming out of the gallon. Thiswas repeated with varied ratios of plastics to natural zeolite (67:33; 75:25; 80:20; and 83:17 wt%). Pyrolysis was run for two hours and every 20 minutes the sample was weighed to gauge the change inmass of gas and liquid. After 120 minutes, the solid sample was examined to identify the mass of final solid. Based on the research, at the temperature of 440ºC, the highest liquid yield was 68.42%. On the other hand, with the ratio of raw material to zeolite at 83:17 wt%, the largest yield of liquid was 87.31%. The liquid product in various temperature and comparisons of percentage of raw material to catalyst was found to meet diesel specifications based on The Decree of Director General of Fuels and Gas Year 200,8 Number 14,496 K/14/DJM/2,008.
Effect of Surfactant Type Modifications, Glucose Inducer Concentrations, and Mineral Sources towards Lipase Enzyme Activity of Aspergillus niger ITBCC L74 on Rice Bran Substrate Ajeng Ardani; Shinta Rismayanti; Hamid Abdillah
Nusantara Science and Technology Proceedings Join Proceeding "Basic and Applied Science Conference (BASC) 2021 & 1st Education Research and Appli
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2021.1101

Abstract

A surface-active agent is a substance added to a liquid to increase its spreading properties by lowering the surface tension. On the other hand, an inducer is a substance to triggers the production of lipase enzymes from bacteria. This study aims to formulate the microbial growth medium to produce high activity of lipase through modification of surfactant type, glucose inducer concentrations, and mineral sources using Aspergillus niger as a microbial starter and rice bran as substrate. A solid fermentation was built and prepared in this study for lipase production. The titrimetric method using NaOH solution was used to determine mol of free fatty acids per minute, type of surfactant, the optimal glucose concentration, and mineral sources on lipase enzyme activity. Tween 80 and Tween 20 are lipid-based surfactants used in this experiment. The best type of surfactant was Tween 80 with 1% of glucose inducer. It produced a lipase activity of 2.53 U/mL. In contrast, Tween 20 with 0.75% glucose inducer produced a lipase activity of 2.27 U/mL. FeSO4 and CaCl2 were the inorganic mineral sources used in this study. The best result was found at 0.6% of FeSO4, it can generate enzyme activity of 2.13 U/mL.
Optimisasi Sumber Nutrisi dan Waktu Inkubasi untuk Meningkatkan Aktivitas Enzim Lipase dari Aspergillus niger ITBCC L74 pada Substrat Dedak Padi Hamid Abdillah; Ilham Caresa Wardana; Naba Dalayuma Maryama; Muktiari Hasbullah
Prosiding University Research Colloquium Proceeding of The 11th University Research Colloquium 2020: Bidang MIPA dan Kesehatan
Publisher : Konsorsium Lembaga Penelitian dan Pengabdian kepada Masyarakat Perguruan Tinggi Muhammadiyah 'Aisyiyah (PTMA) Koordinator Wilayah Jawa Tengah - DIY

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Abstract

Enzim lipase didefinisikan sebagai enzim yang menghidrolisis asam lemak rantai panjang. Substrat alami enzim lipase terdiri dari trigliserida yang tersusun dari asam lemak rantai panjang. Di Indonesia permintaan enzim untuk memenuhi kebutuhan industri dalam proses fermentasi mengalami peningkatan secara signifikan yang mencapai angka kebutuhan 2500 ton dengan nilai impor sekitar 200 miliar, diperkirakan akan terus meningkat antara 5% hingga 7% setiap tahunnya. Penelitian ini bertujuan untuk menentukan nutrisi optimum pada proses fermentasi padat menggunakan substrat dedak padi dan strain Aspergillus niger karena sudah terbukti cukup baik untuk memproduksi enzim lipase. Variasi penelitian yang digunakan adalah sumber nutrisi berupa sumber nitrogen, sumber mineral anorganik, kadar air substrat dan waktu inkubasi agar menghasilkan enzim lipase dengan aktivitas tertinggi. Hasil penelitian menunjukkan sumber nitrogen terbaik adalah urea 4% dengan aktivitas enzim lipase 1,07 U/mL dan NH4NO3 6% sebesar 1,60 U/mL. Sumber mineral anorganik terbaik adalah FeSO4 0,6% dengan aktivitas enzim lipase tertinggi 3,47 U/mL dan MgSO4 2 mmolar sebesar 0,67 U/mL. Kadar air terbaik adalah 55%, dengan aktivitas tertinggi 1,07 U/mL, sedangkan waktu inkubasi terbaik Aspergillus niger adalah 6 hari dengan aktivitas tertinggi sebesar 1,47 U/mL.
Synthesis of Antimicrobial Silver Nanoparticle Varnish using Moringa Leaf Bioreductor (Moringa Olifiera): Sintesis Pernis Nanopartikel Perak Anti Mikroba dengan Bioreduktor Daun Kelor (Moringa Olifiera) Hamid Abdillah; Muhammad Baharits; Rijal Abidin; Firdaus Rizki Biantoro
Jurnal Kimia dan Rekayasa Vol. 2 No. 2 (2022): Jurnal Kimia dan Rekayasa Edisi Januari 2022
Publisher : Program Studi S1 Teknik Kimia, Fakultas Teknik, Universitas Setia Budi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31001/jkireka.v2i2.38

Abstract

Silver nanoparticles have stable properties and potential applications especially as anti-microbial agents. The growth of fungi and bacteria on the wood surface can be inhibited by varnishing with silver nanoparticles. The nano-silver particles were prepared by synthesizing silver nitrate at concentration of 1, 3, and 5 mM with Moringa oleifera as a bioreductant. PVA (Polyvinyl Alcohol) as a stabilizer was varied at the levels of 0.5%, 1%, and 2%. In the UV-Vis test, the wave peaks are in the range 395-515 nm, this is in accordance with the characteristics of silver nanoparticles. The addition of 1% PVA to silver nanoparticles provided the best stability among the four concentrations provided by evidence of low maximum wavelength shift after storing. Particle size examination using the Particle Size Analyzer (PSA) showed silver nanoparticles had a size of 75.6 nm. Then the silver nanoparticle solution was applied to the resin varnish. The solution of silver nanoparticles has an effect on the antimicrobial properties of resin varnish, as evidenced by the absence of mold growth in the media with silver nanoparticles added. Abstrak Nanopartikel perak memiliki sifat yang stabil dan aplikasi yang potensial khususnya sebagai agen anti-mikroba. Pertumbuhan jamur dan bakteri pada permukaan kayu dapat dihambat dengan pernis yang diberi bahan nanopartikel perak. Partikel nano-perak dibuat melalui sintesis perak nitrat konsentrasi 1, 3, dan 5 mM dengan bioreduktor daun kelor (Moringa oleifera). PVA (Polivinil Alkohol) sebagai stabilsator divariasikan pada kadar 0,5, 1, dan 2%. Pada pengujian UV-Vis, puncak gelombang berada pada rentang 395-515 nm yang sesuai dengan karakteristik nanopartikel perak.  Penambahan PVA 1% pada nanopartikel perak memberikan kestabilan paling baik diantara keempat konsentrasi karena pergeseran panjang gelombang maksimal yang rendah. Pemeriksaan ukuran partikel menggunakan Partikel Size Analyzer ( PSA ) menunjukkan nanopartikel perak memiliki ukuran 75,6 nm. Selanjutnya larutan nanopartikel perak tersebut diaplikasikan pada pernis damar.  Larutan nanopartikel perak berpengaruh terhadap sifat anti mikroba pada pernis damar, dibuktikan dengan tidak tumbuhnya jamur pada media yang ditambahkan nanopartikel perak.
Effect of Lactic Acid Bacteria Concentration on Modification of Banana Humble Flour by Fermentation Sito Luthfi Gunawan; Hamid Hamid
West Science Nature and Technology Vol. 1 No. 01 (2023): West Science Nature and Technology
Publisher : Westscience Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58812/wsnt.v1i01.231

Abstract

Banana weevil is a waste that has not been used much, however banana weevil has content lots of nutrition. So that need effort for utilise the banana weevil so that it can beneficial for society. This study used lactic acid bacteria fermentation method which aims to analyze the characteristics of modified banana weevil flour. Then thinly sliced banana weevil soaked for 2 hours inside sodium metabisulfite solution then soaked again use finished solution mixed with bacteria sour lactate with concentration 0;0,02;0,025;0,03 ml/L. After that hump dried and ground for become flour and tested characteristics. The results showed that the swelling power test level was highest at a concentration of 0.03 ml/L, which was 13.39 grams, the % solubility test was highest at a concentration of 0.03 ml/L with a value of 0.12%, the results of the viscosity test after being modified had the same value, namely of 1.4 mPa.s, for the results of reducing sugar content after being modified it decreased and a result of 4% was obtained.
Pengaruh Fraksi Volume Ampas Tebu (Bagasse) dan Resin Epoksi dengan Pelapisan menggunakan Larutan Vinyltrimethoxysilane Terhadap Karakteristik Komposit Nova Tria Prihartini; Sinta Sulastri; Hamid Abdillah
Gunung Djati Conference Series Vol. 44 (2024): Seminar Nasional (SEMNAS) Kimia Tahun 2024
Publisher : UIN Sunan Gunung Djati Bandung

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Abstract

Pemanfaatan ampas tebu (bagasse) sebagai bahan baku material selulosa masih terlalu jarang. Selain pengolahan gula untuk diambil airnya, pemanfaatan tebu hanya sebatas dijadikan bahan bakar industri atau limbah buangan saja. Pada penelitian ini ampas tebu (bagasse) akan dimanfaatkan sebagai bahan baku pembuatan komposit. Komposit adalah kombinasi dari dua bahan yang mana salah satu bahan disebut fase penguat (serat, lembaran, dan partikel) tertanam dalam bahan lainnya yang disebut fase matriks. Matriks yang harus digunakan pada komposit harus bersifat compatible dengan seratnya karena formulasi resin yang dipilih akan menentukan siklus polimerisasi (curing). Resin thermosetting adalah suatu polimer yang ketika dipanaskan akan mengeras dan tidak dapat dibentuk kembali. Epoxy merupakan salah satu jenis resin thermosetting yang terbaik. Pembuatan komposit akan ditambahkan pelapisan larutan berupa silane coupling agent (SCA) pada serat bagasse. Vinyltrimethoxysilane digunakan sebagai bahan pengikat antara serat alam dan matriks. Metode yang digunakan pada penelitian ini yaitu metode hand lay up. Metode tersebut adalah metode sederhana dengan proses terbuka dari proses fabrikasi komposit.
Pengaruh Rasio Epoksi-Serat Sabut Kelapa, Arah Susunan, Volume dan Konsentrasi Vinyltrimethoxysilane terhadap Kekuatan Tarik Komposit Fera Nur Puspita Sari; Lutfia Bunga Fatimah; Hamid Abdillah Abdillah
Gunung Djati Conference Series Vol. 44 (2024): Seminar Nasional (SEMNAS) Kimia Tahun 2024
Publisher : UIN Sunan Gunung Djati Bandung

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Abstract

Sabut kelapa merupakan salah satu limbah yang diperoleh dari tempat pengolahan buah kelapa yang menghasilkan jumlah limbah yang cukup besar, sehingga dalam upaya untuk mengurangi limbah sabut kelapa sekaligus meningkatkan nilai ekonominya yaitu dengan membuatnya menjadi material penguat komposit dengan mengambil serat sabut kelapa. Namun, ketahanan komposit polimer berpenguat serat alam memiliki ikatan yang lemah antara pengisi (filler) dengan matriks polimer, sehingga penggunaan agen pengikat juga dibutuhkan yaitu vinyltrimethoxysilane (VTMS). Pada penelitian ini, proses pembuatan komposit epoksi-serat sabut kelapa dibuat menggunakan metode cetakan terbuka (Hand Lay Up) dan pengujian sesuai dengan standar ASTM D638 menggunakan alat Universal Testing Machine (UTM). Hasil pengujian kuat tarik komposit epoksi-serat sabut kelapa berdasarkan pengaruh rasio dan arah susunan epoksi-serat sabut kelapa mengalami kenaikan seiring dengan penambahan volume serat serta berpengaruh signifikan karena arah susunan serat. Diperoleh komposit yang memiliki kuat tarik tertinggi adalah pada variasi rasio 14%:86%/90° dengan nilai sebesar 18,619 MPa. Hasil pengujian kuat tarik komposit epoksi-serat sabut kelapa berdasarkan pengaruh konsentrasi dan volume vinyltrimethoxysilane (VTMS) mengalami peningkatan seiring dengan tinggi volume dan konsentrasi vinyltrimethoxysilane (VTMS). Diperoleh komposit yang memiliki kuat tarik tertinggi adalah pada spesimen dengan konsentrasi vinyltrimethoxysilane (VTMS) 8% dan volume 4 ml kuat dengan nilai sebesar 21,43 MPa. Dapat diketahui juga pengaruh penambahan larutan vinyltrimethoxysilane (VTMS) pada komposit epoksi-serat sabut kelapa mampu meningkatkan jumlah ikatan kovalen antara resin epoksi dan serat sabut kelapa sehingga dapat meningkatkan kuat tarik komposit yang dibentuk.
Co-Authors Ajeng Ardani Anak Agung Istri Sri Wiadnyani Annisa Ayu Ilma Arimurti, Rizki Dyah Emi Erawati Fera Nur Puspita Sari Firdaus Rizki Biantoro Harmoko, Tri Ilham Caresa Wardana Lutfia Bunga Fatimah Muhammad Baharits Mujiburohman, Muhammad Muktiari Hasbullah Naba Dalayuma Maryama Nova Tria Prihartini Rijal Abidin Shinta Rismayanti Sinta Sulastri Sito Luthfi Gunawan