Article Per Year (5 Year)
p-Index From 2021 - 2026
5.19
P-Index
This Author published in this journals
All Journal Reaktor Jurnal Bahan Alam Terbarukan Jurnal Pengabdian Kepada Masyarakat Sakai Sambayan Indonesian Journal of Chemical Science Jurnal Teknologi Prosiding Seminar Nasional Hasil Penelitian Sains, Teknik dan Aplikasi Industri Fakultas Teknik Universitas Lampung Journal Of Chemical Process Engineering JURNAL REKAYASA KIMIA & LINGKUNGAN Jurnal Teknologi dan Inovasi Industri Nemui Nyimah
Yuli Darni
Jurusan Teknik Kimia, Fakultas Teknik, Universitas Lampung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Other

Published : 50 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 50 Documents
Search

 1   2   3   4   5 
Sodium Hydroxide Treatment for Cellulose Fiber Accessibility from Corncobs under Microwave Assistive Hanif, Muhammad; Krisanti, Aknasasia Virginia; Salfitri, Selvy; Darni, Yuli; Utami, Herti; Azwar, Edwin; Gunawan, Poernomo
Jurnal Rekayasa Kimia & Lingkungan Vol 16, No 2 (2021): Jurnal Rekayasa Kimia & Lingkungan (December, 2021)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v16i2.20061

Abstract

Corncob is abundantly available lignocellulosic biomass resources obtained from crops harvesting and found to be solid waste accumulation on a field. Less corncob is used as a solid fuel for cooking, and a more significant portion is vanished on the field by burning. Promisingly, corncob contains considerable cellulose as one value-added component potentially utilized as biomaterial or biofuel feedstock. However, the presence of lignin in natural lignocellulosic biomass results in recalcitrant structure and hinders cellulose accessibility. This study aimed to investigate microwave-assisted alkaline treatment to retain cellulose in the solid product while removing other impurities in corncob, especially hemicellulose and lignin. Sodium hydroxide was selected as a chemical with some variations in concentration. The chemical treatment was carried out under 400 W microwave power with various residence times and a 1:10 solid to liquor ratio. The cellulose content upgraded from 26.97% to 71.26% while reducing hemicellulose and lignin from 38.49% to 18.15% and 19.28% to 6.4%, respectively, on chemical treatment using 8% sodium hydroxide concentration for 20 minutes residence time. Scanning electron microscope (SEM) and Fourier transform infrared (FTIR) analysis also confirmed the results. The treated corncob also increased its crystallinity from 30.11% to 52.91%.
The Leaching of Natural Dyes from Avocado (Persea Americana Mill) Seeds Using the Ultrasonic-Assisted Extraction Method and Its Application to Cellulose Fibers Utami, Herti; Agustin, Veni Tri; Novirianti, Luthfiah; Darni, Yuli; Lesmana, Donny; Takagi, Ryosuke
Jurnal Rekayasa Kimia & Lingkungan Vol 16, No 2 (2021): Jurnal Rekayasa Kimia & Lingkungan (December, 2021)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v16i2.20140

Abstract

The textile industry uses synthetic dyes because they are cheaper and easier to obtain. Moreover, the color availability is guaranteed and more varied. However, these synthetic dyes have a negative impact on health and the environment. The natural dye from avocado (Persea Americana Mill) seeds can become an alternative for synthetic dyes. Polyphenol compounds, such as tannins and flavonoids, are natural color sources found in avocado seeds. The extraction of natural dyes from avocado seeds is carried out by using a non-conventional method, namely ultrasonic-assisted extraction which has great efficiency and short operating time. In this study, researchers examined the parameters that affect the yield of dye extraction from avocado seeds, namely solvent concentration and extraction time. In addition, researchers also conducted qualitative analysis on the pigment content in the yield of extraction using UV-Visible Spectrophotometry and GC-MS tests. The results indicated that the highest yield obtained from avocado seeds was 16.6742% with 90 minutes extraction time using 70% ethanol solvent. Furthermore, if the dye is applied to cellulose fibers, such as the cotton cloth, the color will change depending on the fixator added. Based on the result of the UV-Visible Spectrophotometry test, the avocado seeds contain flavonoids. Meanwhile, from the result of the GC-MS test, the compound with the largest percentage detected in avocado seeds is the 13-Tetradecynoic acid, methyl ester (C15H26O2). The compound contains a chromophore, such as a carbonyl group (C = O) which is a common feature of flavonoids.
Aplikasi Mikrofibril Selulosa Dari Batang Sorgum Sebagai Pengisi Pada Sintesis Film Bioplastik Darni, Yuli; Lestari, Hilda; Lismeri, Lia; Utami, Herti; Azwar, Edwin
Jurnal Rekayasa Kimia & Lingkungan Vol 13, No 1 (2018): Jurnal Rekayasa Kimia & Lingkungan (June, 2018)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v13i1.8647

Abstract

Pada penelitian ini telah disintesis bioplastik dengan penambahan mikrokristalin selulosa dari batang sorgum sebagai pengisi. dengan formulasi pati sorgum-gelatin dan pemplastis gliserol. Formulasi pati sorgum-gelatin yang digunakan yaitu 10:0 ; 9,5:0,5 ; 8,5:1,5 ; 7,5:2,5 ; 6,5:3,5 dan 5,5:4,5 (gr/gr). Penambahan mikrokristalin selulosa sebesar 0 %, 1%, 2%, dan 3% dari total berat kering campuran pati dan gelatin. Suhu gelatinisasi yang digunakan pada 95oC dan konsentrasi gliserol 10% berat berdasarkan persen berat kering dari total berat campuran 10 gram pati dan gelatin. Kecepatan pengadukan sebesar 375 rpm dengan temperatur pengeringan yang digunakan adalah 60oC selama 11 jam. Ukuran granula pati yang digunakan yaitu lolos ayakan 60 mikron dan waktu pengadukan selama 35 menit. Mikrokristalin selulosa sebagai pengisi dihasilkan dengan metode alkali-mekanik dan berukuran 8 mikron. Penggunaan mikrokristalin selulosa dapat meningkatkan kuat tarik sebesar 3,65-10,47 MPa, dan menurunkan perpanjangan putus sebesar 2,14-14,32%.
Produksi Gula Reduksi dari Batang Ubi Kayu dengan Hidrolisis Menggunakan Asam Encer dan Induksi Medan Elektromagnetik Lismeri, Lia; Utami, Rhiki Sekti; Darni, Yuli; Hanif, Muhammad; Riyanto, Agus
Jurnal Rekayasa Kimia & Lingkungan Vol 13, No 1 (2018): Jurnal Rekayasa Kimia & Lingkungan (June, 2018)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v13i1.8840

Abstract

Batang ubi kayu yang dihasilkan dari limbah pertanian merupakan biomassa lignoselulosa dengan komposisi selulosa 39,30%, hemiselulosa 24,34% dan lignin 13,42%. Penelitian ini bertujuan untuk mengkonversi limbah batang ubi kayu menjadi gula reduksi. Proses konversi lignoselulosa menjadi gula reduksi secara hidrolisis umumnya dilakukan pada temperatur dan tekanan tinggi dengan menggunakan katalis asam. Pada penelitian ini, digunakan induksi medan elektromagnetik pada proses hidrolisis lignoselulosa dengan menggunakan asam encer sehingga proses hidrolisis dapat berlangsung pada kondisi yang rendah. Hasil penelitian menunjukkan komponen gula reduksi yang dihasilkan berupa xylosa, arabinosa dan glukosa. Kadar gula reduksi sebesar 10 mg/ml menggunakan pelarut HCl 5%, induksi medan elektromagnetik sebesar 7,1810-4 Tesla, pada temperature 100C selama 60 menit. Hasil ini sebanding dengan penelitian serupa yang berlangsung pada suhu lebih tinggi dengan menggunakan asam kuat. Parameter operasi yang lunak dapat mengatasi degradasi gula reduksi menjadi komponen HMF dan furfural, sehingga proses hidrolisis menjadi lebih efektif.
Modification of Sorghum Starch-Cellulose Bioplastic with Sorghum Stalks Filler Darni, Yuli; Dewi, Febrina Yohana; Lismeri, Lia
Jurnal Rekayasa Kimia & Lingkungan Vol 12, No 1 (2017): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v12i1.5410

Abstract

This study evaluated the feasibility of bioplastics production by various ratio of sorghum starch and cellulose from red seaweed Eucheuma spinossum, and the use of glycerol as plasticizer and sorghum stalks as filler. Solid-liquid matrix transition should be far over the operating temperature of gelatinization and extracted at 95oC in order to avoid the loss of conductivity. The analyzed variables were starch and cellulose seaweed Eucheuma spinossum and the addition of variation of filler. Sorghum stalk could be expected to affect the mechanical and physical properties of bioplastics. A thin sheet of plastic (plastic film) was obtained as a result that have been tested mechanically to obtain the best condition for the formulation of starch-cellulose 8.5:1.5 (g/g). From the result of morphological studies, the fillers in the mixture composites were more randomly in each product and the addition of filler can increase mechanical properties of bioplastics. Chemical modication had a major effect on the mechanical properties. The phenomena of degradation and thermoplasticization were visible at chemical changes that can be observed in FTIR spectrum test results.
Sintesis Selulosa Asetat dari Limbah Batang Ubi Kayu Lismeri, Lia; Zari, Poppy Meutia; Novarani, Tika; Darni, Yuli
Jurnal Rekayasa Kimia & Lingkungan Vol 11, No 2 (2016): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v11i2.5407

Abstract

Salah satu hasil pertanian terbesar di Indonesia adalah tanaman ubi kayu. Selama ini batang ubi kayu tersedia dalam jumlah yang cukup besar namun belum dimanfaatkan secara optimal. Batang ubi kayu memiliki kandungan lignoselulosa yaitu selulosa 39,29%, hemiselulosa 24,34%, dan lignin 13,42%. Penelitian ini bertujuan untuk memanfaatkan limbah batang ubi kayu yang akan dijadikan sebagai bahan baku pembuatan selulosa asetat. Proses pembuatan selulosa asetat dilakukan dalam 2 tahap yaitu tahap isolasi selulosa (proses pretreatment, delignifikasi, dan bleaching) dan tahap sintesis selulosa asetat. Pelarut yang digunakan pada proses pretreatment yaitu asam fosfat, asam asetat, dan asam klorida. Hasil penelitian menunjukkan bahwa larutan asam fosfat 3% menghasilkan densitas terkecil yaitu 0,833 g/mL yang menunjukan bahwa telah terjadinya swelling. Pada proses delignifikasi digunakan variasi waktu dan rasio bahan terhadap pelarut. Kadar selulosa terbesar yang diperoleh yaitu 56,92% dengan waktu pemasakan 2 jam dan rasio sampel terhadap pelarut 1:12 (v/v). Identifikasi gugus fungsi FTIR terhadap selulosa asetat menunjukkan adanya serapan gugus karbonil (C=O) dan gugus ester (C-O), masing-masing terlihat pada bilangan gelombang 1738,47 cm-1 dan 1224,39 cm-1. Kadar asetil selulosa asetat yang dihasilkan sebesar 41,01% dan termasuk jenis selulosa diasetat yang dapat dimanfaatkan lebih lanjut dalam pembuatan membran, film topografi, dan benang.
Produksi Bioplastik dari Sorgum dan Selulosa Secara Termoplastik Darni, Yuli; Sitorus, Tosty Maylangi; Hanif, Muhammad
Jurnal Rekayasa Kimia & Lingkungan Vol 10, No 2 (2014): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v10i2.2420

Abstract

Produksi bioplastik dari sorgum dan selulosa hasil ekstraksi rumput laut eucheuma spinosum dengan gliserol sebagai pemplastis secara termoplastik telah diteliti. Variabel yang diteliti adalah perbandingan massa pati sorgum dengan selulosa sebesar 10:0; 9,5:0,5; 8,5:1,5; 7,5:2,5; 6,5:3,5; 5,5:4,5 (w/w). Partikel pati sorgum dan selulosa berukuran lolos ayakan 63 ?m. Proses sintesis diawali dengan sonifikasi selama 60 menit pada suhu 80oC, dilanjutkan dengan gelatinisasi yang dijalankan di dalam reaktor batch berpengaduk pada kecepatan 916 rpm dan suhu 95oC selama 35 menit. Hasilnya dikeringkan di dalam oven bersuhu 60oC selama 8 jam. Hasil penelitian menunjukkan bahwa karakteristik bioplastik terbaik diperoleh ketika perbandingan massa pati-selulosa sebesar 6,5:3,5 (w/w). Bioplastik ini memiliki kuat tarik 11,53 kPa, perpanjangan 32,75%, Modulus Young 46,946 kPa, dan densitas 150 kg/m3. Film bioplastik ini dapat diaplikasikan untuk pengemas makanan dan industri obat-obatan.
Penentuan Kondisi Optimum Ukuran Partikel dan Bilangan Reynold Pada Sintesis Bioplastik Berbasis Sorgum Darni, Yuli
Jurnal Rekayasa Kimia & Lingkungan Vol 8, No 2 (2011): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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

Abstract

The article reported the laboratory experiment to obtain the optimal condition of particle size and Reynold Number of bioplastic film based on the plastic package standard of High Density Polyethylene (HDPE). Particle sizes of starch were varied at 63, 90, 106, 600, and 1000 micron, and the mixing rate were changes at 190, 252, 313, 375, and 437 rpm. The concentration of chitosan and gliserol added to solution were set as constant variable as 20 and 10 wt %, respectively. The temperature of gelatinitation was also fixed at 95OC. The fabricated of bioplastic film were characterized for mechanical property such as tensile strength, elongation at break and Modulus Young by using a Universal Testing Machine. The morphology of film sheets were observed by using a scanning electron microscopy (SEM). Moreover, the obtained film was also investigated for water uptake parameter. The result showed that the mechanical properties were improve by increasing mixing rate at smallest particle sizes of starch. The water uptakes shows decrease at hight mixing rate. SEM images showed that the morphology of bioplastic was almost simmilar to the morphology of HDPE. The optimum condition was found that the best film was obtained at particle size of starch 63 micron, Reynold Number of 959, with mixing rate of 375 rpm. The mechanical value at best condition was 19.27%, 757.046 Mpa, and 142.875 for elongation, Modulus Young, and tensile strength, respectively.Keywords: bioplastic, reynold Number, starch, sorgum
Studi Pembuatan dan Karakteristik Sifat Mekanik dan Hidrofobisitas Bioplastik dari Pati Sorgum Darni, Yuli; Utami, Herti
Jurnal Rekayasa Kimia & Lingkungan Vol 7, No 2 (2009): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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

Abstract

This research investigated the utilization of sorghum starch and chitosan as basic material for preparation of biodegradble plastic. The optimum conditions for the formation of biodegradble plastic and the effect of starch-chitosan formulation on mechanical properties of the biodegradable plastic were studied. The experiments were conducted by varying concentration sorbitol as plasticizer (i.e. 20%, 25%, 30%, and 40% dry weight), ratio starch to chitosan (i.e. 6:4, 7:3, 8:2, 9:1, 10:0 g/g) and at ranging gelatinuous temperature of 65-95oC. The results showed that the optimum conditions were obtained at starch:chitosan mass comparison of 7:3 and sorbitol concentration of 20%. The mechanical properties of the biodegradable plastic produced at gelatinuous temperature of 95oC were: tensile strength of 6,9711 Mpa, elongation percentage of 16,48, modulus young of 42,48 Mpa, and water resistance of 36,825%.Keywords: bioplastic, chitosan, plasticizer, sorgum, sorbitol
Pengelolaan Sampah Plastik Di SMAN 8 Bandar Lampung Untuk Meningkatkan Kesadaran Masyarakat Terhadap Pelestarian Lingkungan Darni, Yuli; Utami, Herti; Lismeri, Lia; Ginting, Simparmin Br; Lesmana, Donny; Rustamaji, Heri; Rustamaji, Galuh S
Nemui Nyimah Vol. 4 No. 1 (2024): Nemui Nyimah Vol.4 No.1 2024
Publisher : FT Universitas Lampung

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

Abstract

Pengabdian di SMAN 8 Bandar Lampung ini bertujuan meningkatkan dan mengembangkan usaha pengelolaan sampah plastik melalui Bank Sampah untuk menghasilkan produk dengan nilai ekonomis lebih tinggi. Dengan adanya Bank Sampah, siswa di SMAN 8 dapat belajar bagaimana memilah dan mengelola sampah plastik di lingkungan sekolahnya. Kegiatan ini akan memberi dampak langsung terhadap usaha penanganan sampah plastik. Metode yang dilakukan dalam pengabdian ini meliputi sosialisasi dan pelatihan pengelolaan bank sampah. Dalam sosialisasi akan dijelaskan secara singkat tentang pemanfaatan dan penanganan sampah plastik. Pelatihan diberikan kepada guru-guru dan siswa/i SMAN 8 tentang cara pengelolaanj Bank Sampah. Bank sampah yang dibangun oleh tim pengabdian nantinya akan diserahkan kepada mitra. Kegiatan akan dilakukan di SMAN 8, dengan sasaran khususnya adalah guru dan siswa/i, kemudian dari mereka akan disebarkan kepada masyarakat sekitarnya. Hasil akhir yang diharapkan Mitra dapat mengelola bank sampah untuk meningkatkan efesiensi penanganan sampah plastik dan meningkatkan nilai ekonomisnya, dalam hal ini Mitra TPST unila akan membantu sebagai penampung sampah plastik yang telah dikumpulkan. Hal ini dapat dikatakan sebagai kegiatan dukungan positif terhadap salah satu program pemerintah dalam menjaga lingkungan hidup dan upaya minimasi limbah.
Co-Authors Abrar, Azzami Agus Riyanto Agustin, Veni Tri Akbar, Muhammad Rafli Amalia, Faza Anandati, Ghea Maulidaco Anggraeni, Pangesti Aris Setiawan Aryanti, Annisa Asmara, Panji Azhar Azhar Azhar Azizah, Ara Annastasya Azwar, Edwin Azzahra, Syifa Damayanti, Sri Ismiyati Darmansyah DARMANSYAH . Dewi, Febrina Yohana Donny Lesmana Eltri, Amandha Putri Feerzet Achmad Fikrah, Faizatul Gomiyati, Nada Afifah Gunawan, Poernomo Hakim, Rifqi Amirul Harahap, Fahmi Alif Utama Harahap, Katrina Herdiana, Novita Heri Rustamaji Herry Wardono Herti Utami Heru, Heru Immadudin, Muhammad Iqbal Irfan, Muhammad Muslim Krisanti, Aknasasia Virginia Lestari, Hilda Lismeri, Lia M. Haviz Marlina, Arlin Marlina, Titi Mayanti, Eva Miranda, Thalya Muhammad Hanif Nandi Haerudin Nandini, Ni Putu Ariessa Novarani, Tika Novirianti, Luthfiah Novri Tanti, Novri Nugrahini, Panca Oktapia, Sri Panca Nugrahini Febriningrum Pandiangan, Kamisah Delilawati Pebriyanti, Dita Persada, Citra Pista, Annisa Fitria Putri, Erisha Qorimah, Akhlatul Rahmi, Hertantri Yulia Rianto, Yoga Rifqi Fadhilah Irsa Riyadi, Lutfia Rahma Rizky, Agita Amy Rustamaji, Galuh S Salfitri, Selvy Sanjaya, Mitra Dimas Sapitri, Refia Saputra, Muhammad Galuh Simanjuntak, Ecclesya Agata Simparmin br Ginting Solly Aryza Sri Ratna Sulistiyanti Sri Ratna Sulistyanti Sudibyo Sudibyo Sulha, Mutia Takagi, Ryosuke Tasry, Nazwa Aulia Tosty Maylangi Sitorus, Tosty Maylangi Utama, Swarna Dharma Utami, Rhiki Sekti Zari, Poppy Meutia