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Sri Redjeki
Program Studi Teknik Kimia, Fakultas Teknik, Universitas Pembangunan Nasional ”Veteran” Jawa Timur
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KERTAS ANTI RAYAP BERBAHAN LIMBAH KULIT KACANG TANAH DAN BULU AYAM DENGAN PENAMBAHAN EKSTRAK DAUN SIRSAK Nurmalitasari, Aldila Laksmi; Angelina, Maya; Redjeki, Sri
JURNAL INTEGRASI PROSES Vol 14, No 1 (2025)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v14i1.32347

Abstract

Kertas dengan bahan baku selulosa kerap kali dijadikan santapan oleh rayap, dalam mencegah hal tersebut tercipta sebuah inovasi berupa kertas anti rayap. Daun sirsak memiliki kandungan senyawa acetogenin 49% yang berfungsi sebagai racun perut untuk membunuh rayap. Tujuan penelitian ini adalah membuat kertas anti rayap dari kulit kacang tanah dan bulu ayam dengan penambahan ekstrak daun sirsak sesuai dengan standar SNI 01.7207-2006, meliputi parameter penurunan berat kertas, lethal time, dan mortalitas rayap. Pembuatan kertas anti rayap dilakukan dengan penambahan ekstrak daun sirsak konsentrasi 2, 4, 6, 8, dan 10 % dengan waktu pengamatan terhadap kematian rayap selama 1 hingga 5 hari. Penelitian menunjukkan bahwa penambahan ekstrak daun sirsak pada kertas efektif meningkatkan ketahanan terhadap rayap sesuai standar SNI. Konsentrasi 8% menunjukkan hasil terbaik, dengan mortalitas rayap 100% dalam empat hari dan LT₅₀ tercapai dalam tiga hari pada konsentrasi 6%, 8%, dan 10%. Analisis RSM menunjukkan titik optimum pada konsentrasi 8% dan waktu 5 hari, dengan mortalitas 95,22% dan penurunan berat kertas 0,23%. Ekstrak daun sirsak terbukti efektif sebagai bahan anti rayap dalam pembuatan kertas dengan konsentrasi optimal 8%.
KINETIKA REAKSI HIDROLISIS ENZIMATIS SELULOSA MENJADI GLUKOSA DARI KULIT DURIAN (DURIO ZIBETHINUS RUMPH) MENGGUNAKAN ENZIM SELULASE Maharani, Eka Ferdinda Putri Ayu; Agustina, Meri; Redjeki, Sri; Muljani, Srie; Pujiastuti, Caecilia
Jurnal Teknik Kimia Vol 19, No 2 (2025)
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v19i2.5155

Abstract

The production of durian in Indonesia causes pollution of the environment by durian skin waste, so it is necessary to utilize durian skin. Durian skin contains 50-60% cellulose, 5% lignin, 5% starch, and other compounds.  The cellulose content in durian peel is utilized for making glucose by enzymatic hydrolysis method carried out under pH 5 conditions, 10% cellulase enzyme concentration, 50oC temperature, and 160 rpm stirring speed. Optimization of the enzymatic hydrolysis process depends on understanding the reaction kinetics that provide information about the reaction rate and conversion efficiency. This study aims to determine the reaction kinetics equation of enzymatic hydrolysis of cellulose to glucose from durian peel using cellulase enzyme and determine the effect of substrate concentration and hydrolysis time on product concentration. Substrate concentration and hydrolysis time have a directly proportional relationship to product concentration. At 5% substrate concentration and 180 minutes, the highest product concentration of 1.7% was obtained. This study was conducted with hydrolysis times of 60, 90, 120, 150, and 180 minutes and variations in substrate concentrations of 1%, 2%, 3%, 4%, and 5%. The conversion of enzymatic hydrolysis of cellulose to glucose at 1% substrate concentration was 69.43% with a reaction rate equation of
The Effect of H₂SO₄ Catalyst and Electric Voltage on Hydrogen Gas Production via the Electrolysis of Distilled Water Siti Kotijah; Difa Adanisa; Sri Redjeki
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i3.6880

Abstract

Hydrogen is an environmentally friendly alternative energy source with great potential in the renewable energy sector. One efficient method for hydrogen production is water electrolysis, which can be influenced by catalyst concentration and applied electric voltage. This study aims to analyze the effect of varying H₂SO₄ concentrations and electric voltage on hydrogen production via water electrolysis. The concentrations used were 0.05 M, 0.075 M, 0.1 M, 0.25 M, and 0.5 M, while the applied voltages were 16 V, 18 V, 20 V, 22 V, and 24 V. Constant parameters included 500 mL of distilled water and a 2-minute hydrogen collection time. Gas analysis using Gas Chromatography-Thermal Conductivity Detector (GC-TCD) showed hydrogen detection at a retention time of 2.88 minutes. The highest hydrogen content, 11.143% mol, was achieved at 0.075 M H₂SO₄ and 24 V, with a maximum gas volume of 0.000659 m³. Based on RSNI ISO 14687:2019, the minimum fuel-grade hydrogen requirement is 50% mol. Therefore, further optimization is necessary to improve efficiency. Future studies are recommended to explore alternative catalysts, extend electrolysis time, or modify electrodes, as well as include tests without catalysts to evaluate reaction sustainability and compare hydrogen yields with and without catalytic influence.
Co-Authors Abdullah, Achyar Abdullah, Muhammad Adam Agustina, Meri Angelina, Maya Benito Heru Purwanto Difa Adanisa Dwitama, Santa Kristi Ely Kurniati Erni Romansyah Hawa Aritma Sunarko Putri Iriani Iriani Krisnanto, Ardo M. Hadid Muhaimin Maftukhah, Rizki Maharani, Eka Ferdinda Putri Ayu Muchtadi, Dimas Faizal Akbar Nur Halizah Hadi Nur Hapsari Nurmalitasari, Aldila Laksmi Pujiastuti, Caecilia Putra, Muhamad Reza Arief Rahmi Oktarini SIGIT SUPADMO ARIF Siti Kotijah SRIE MULJANI Syuaibatul Islamiyah Yogaswara, Rachmad Ramadhan