https://jurnaltekkim.upnjatim.ac.id/index.php/jurnaltekkim/issue/feed 2025-06-30T12:47:03+00:00 Prof. Dr. Ir. Sri Redjeki., M.T. jurnaltekkim@upnjatim.ac.id Open Journal Systems <p>Welcome to the new official website of the <em>Jurnal Teknik Kimia </em> (previously accessible at <a href="http://ejournal.upnjatim.ac.id/index.php/tekkim/index">http://ejournal.upnjatim.ac.id/index.php/tekkim/index</a></p> <p>Starting from Volume 20, Issue 1 (2025), all publication processes will be carried out through this site.</p> <p><em>Jurnal Teknik Kimia </em>is an international open-access journal published three times a year—in February, June, and October. The journal accepts original research articles and literature reviews that aim to contribute significantly to the field.</p> https://jurnaltekkim.upnjatim.ac.id/index.php/jurnaltekkim/article/view/6 2025-02-27T04:26:05+00:00 Danila Rorenzya Ardana 21031010094@student.upnjatim.ac.id Aurel Oktaviola Anggraeni 21031010109@student.upnjatim Sri Redjeki sri4tk@yahoo.com

<p><em>Bittern is waste from seawater evaporation in the salt industry. Bittern waste contains various ions, some of which are macro and micro nutrients such as Mg²⁺, Na^+, K^+, Ca²⁺ and Cl^- ions. The Na⁺ ions contained in bittern can be used to produce Sodium Hydroxide (NaOH). To reduce the negative impact of waste on the environment and increase the economic value of liquid waste from the salt making process, bittern is processed into NaOH through a membrane cell electrolysis process. The electrolysis process is carried out using a cation membrane. This method is carried out using two operating conditions that are varied, namely voltage (voltage) 6 volts; 8 volts; 10 volts; 12 volts; and 14 volts and electrolysis time is 1 hour; 1.5 hours; 2 hours; 2.5 hours; and 3 hours. The Na⁺ ion content in bittern is 25933.5 mg/L. The best result of this study was the formation of NaOH deposits with a content of 15.53% at a voltage of 12 volts and an electrolysis time of 1 hour.</em></p>

2025-06-30T00:00:00+00:00 Copyright (c) 2025 Jurnal Teknik Kimia https://jurnaltekkim.upnjatim.ac.id/index.php/jurnaltekkim/article/view/45 2025-06-30T12:47:03+00:00 Anggiany Rizky Kosim 21031010275@student.upnjatim.ac.id Az-zahara Adelia 21031010231@student.upnjatim.ac.id Isni Utami isniutami@yahoo.com Caecilia Pujiastuti caecilia.tk@upnjatim.ac.id Suprihatin ibu.suprihatin@yahoo.com Renova Panjaitan renova.p.tk@upnjatim.ac.id

<p>The removal of Ni²⁺ from electroplating process wastewater can be effectively accomplished using chitosan modified with activated carbon through an adsorption process. This research aims to develop adsorbents with varying mass ratios of chitosan to activated carbon and assess their efficacy in reducing Ni²⁺concentrations, the impact of contact time on this reduction. Adsorbents were prepared by crosslinking protonated chitosan with tripolyphosphate and incorporating activated carbon in the following ratios: 0.5:1.5, 0.75:1.25, 1:1, 1.25:0.75, and 1.5:0.5 grams per gram. The adsorption process involved contacting 500 milliliters of electroplating process wastewater with 2 grams of adsorbent for various durations of 15 to 75 minutes. Ni²⁺ concentration in the filtrate was analyzed using Atomic Absorption Spectroscopy (AAS), and the adsorbent was characterized with Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy (SEM-EDX). The optimal conditions for Ni²⁺ removal occurred with a chitosan/activated carbon mass ratio of 0.5:1.5 grams per gram and a contact time of 60 minutes, resulting in a final Ni²⁺ concentration of 2.17 mg/L, an adsorption efficiency of 98.92%, and an adsorption capacity of 49.46 mg/g. These findings demonstrate the effectiveness of chitosan/activated carbon composites in treating Ni²⁺ contamination in electroplating wastewater, offering a sustainable environmental solution.</p>

2025-06-30T00:00:00+00:00 Copyright (c) 2025 Jurnal Teknik Kimia