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All Journal Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Rekayasa Mesin Teknika: Jurnal Sains dan Teknologi JST ( Jurnal Sains Terapan ) Journal of Community Based Environmental Engineering and Management Specta Journal of Technology Jurnal Inovasi Pengabdian dan Pemberdayaan Masyarakat

Ainun Zulfikar

Institut Teknologi Kalimantan

Author-ID : 5411726

Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Public Health Social Sciences Other

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Studi Pengaruh Waktu Alkalisasi pada Ekstraksi Selulosa Berbasis Serat Eceng Gondok (Eichhornia crassipes) Ainun Zulfikar; Ni Putu Sriniti Novi Kartika Putri; Gusti Umindya Nur Tajalla
SPECTA Journal of Technology Vol. 4 No. 2 (2020): SPECTA Journal of Technology
Publisher : LPPM ITK

This study uses fiber from water hyacinth as the object of research, which is a plant that contains lignocellulose which consists of cellulose, lignin, and hemicellulose. Cellulose extraction is needed to obtain purer cellulose. The cellulose extraction method used was alkalization, using a 17.5% NaOH solution in a mass: volume ratio of 1: 100 with a variation of alkalization time for 20 minutes, 40 minutes and 60 minutes and the alkalization method uses the reflux heating method. Tests used in this study were include gravimetric methods namely Chesson Datta, Fourier Transform Infrared (FTIR), and Scanning Electron Microscope (SEM). Chesson Datta is used to determine the quantitative lignocellulose content by reducing the initial mass and final mass of the sample from the process. FTIR is used to determine the functional groups that lignocellulose has from each sample. SEM was conducted to determine the morphology of the water hyacinth fibers before and after the alkalization treatment. The results obtained by Chesson Datta, with the most optimal alkalization time were 20 minutes with 53.3% cellulose content, 27.6% hemicellulose, and 0.3% lignin. FTIR shows the functional groups C = O, C = C, and C-H belonging to lignocellulose along with the shifting of the wave number and the change in absorbance in each variable. SEM shows morphological differences in the fibers undergoing the process of alkalization with those without treatment. So that the alkalization affects the morphology of the water hyacinth fiber.

Sifat Mekanik Produk Metalurgi Serbuk dari Proses Ball Milling dengan Bahan Baku Al7075 Terhadap Variasi Temperatur Sinter dan Tekanan Kompaksi Hizkia Alpha Dewanto; Muhammad Zaini Abdi; Achmad Maulana; Ainun Zulfikar; Gusti Umindya Nur Tajalla
SPECTA Journal of Technology Vol. 5 No. 2 (2021): SPECTA Journal of Technology
Publisher : LPPM ITK

Powder metallurgy samples, made from Al7075 powder from ball milling, were produced and investigated. Samples were subjected to two different variables, those were compaction pressure and sintering temperatur. Compaction pressure variables were 250, 300, and 350 MPa with constant sintering temperatur of 505oC. Sintering temperatur variations were 425, 465, and 505oC with constant compaction pressure of 350 MPa. The results of density measurement and hardness test were directly proportional to both of research variables, whereas the porosity was inversely proportional. The properties of sample with variables of 350 MPa compaction pressure and 505oC sintering temperatur were the closest one to conventional Al7075, with density of 2.173 g/cm3, 22.2% porosity, and 12.56 VHN hardness. The properties of conventional Al7075 sample were 2.8 g/cm3 density, 0.26% porosity, and 12.68 VHN hardness. The abrupt increase of hardness between 465oC and 505oC sintering temperatur was similar in pattern of its porosity decrease. This means optimum porosity decrease was started between 465oC and 505oC which affecting hardness increase. Highest hardness of powder metallurgy Al7075, which was 99% of conventional Al7075 and porosity of 22.2%, suggested wide application potential of Al7075 produced by powder metallurgy.

Pengaruh Penambahan H2O2 sebagai Foaming Agent pada Karakteristik Batu Bata Ringan Tahan Api Berbahan Dasar Fireclay dan Fly Ash PLTU Teluk Balikpapan Adrian Gunawan; Amelia Anggraini Pangestu; Etty Rahmayanti; Andika A.I. Saputra; Intan Dwi Wahyu Setyo Rini; Ainun Zulfikar; A. I. Arobi
SPECTA Journal of Technology Vol. 6 No. 1 (2022): SPECTA Journal of Technology
Publisher : LPPM ITK

Total kebutuhan material refractory di Indonesia mencapai 200.000 ton per tahun, sedangkan kapasitas produksi mencapai 50.000 ton per tahun. Untuk memenuhi kebutuhan tersebut, diperlukan bahan baku alternatif selain bahan baku utama yakni fireclay yang berasal dari tanah liat, yakni Fly Ash (FA) dari sisa pembakaran batu bara di PLTU. Jenis material refractory dalam penelitian ini adalah batu bata ringan tahan api, dengan menggunakan zat Hidrogen Peroksida (H2O2) sebagai foaming agent. Fly Ash digunakan berasal dari PLTU Teluk Balikpapan dengan tingkat substitusi fireclay sebesar 5% s.d 25%, serta H2O2 dengan variasi 5 ml s.d 9 ml. Analisis yang dilakukan adalah XRF untuk FA, serta kuat tekan, densitas, penyerapan, porositas, dan shrinkage untuk specimen batu bata ringan tahan api. Hasil kuat tekan terbaik adalah 0,549 Mpa dengan linier shrinkage 2%, penyerapan 37,46%, 2%, densitas 1,44 g/cm3, dan porositas 50%

Co-Authors A. I. Arobi Achmad Maulana Ade Wahyu Yusariarta Putra Parmita Adrian Gunawan Al-Shehan, Khulafaur Nawaf Amelia Anggraini Pangestu Andika A.I. Saputra Anggie Melinda Handayani Ariani, Ismi Khairunnissa Asrilsyah Asrilsyah Basyaruddin Basyaruddin Dewanto , Hizkia Alpha Etty Rahmayanti Harfadli, Muhammad Ma'arij Hizkia Alpha Dewanto Idhil Ismail, Andi Intan Dwi Wahyu Setyo Rini Jatmoko Awali Marita Wulandari Marita Wulandari Marpaung, Kevin Muhammad Akram Muhammad Zaini Abdi Muthia Putri Darsini Lubis Ni Putu Sriniti Novi Kartika Putri Nia Sasria Prasaningtyas, Asri Rifqi Aulia Tanjung Rohimsyah, Fikan Mubarok Sabrina Humaira Tajalla, Gusti Umindya Nur Wulandari, Marita Yorika, Rahmi Yunita Triana, Yunita Yusuf, Chiara

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