Ambarwati, Eka Ayu Lintang (2026) Penurunan Kadar Logam Cr (VI) dan Zat Warna dari Limbah Batik Menggunakan Adsorben Zeolit Terimpregnasi Fe2(SO4)3 dengan Metode Adsorpsi. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
This study investigates the treatment of batik wastewater containing Cr(VI) and dyes using impregnated natural zeolite in a fixed-bed column system. The study was motivated by the presence of heavy metals and dyes in batik wastewater, which have the potential to cause environmental pollution, while natural zeolite has relatively limited adsorption capacity and therefore requires modification. Impregnation was performed to introduce Fe-based active sites onto the zeolite surface, thereby enhancing its adsorption capacity toward anionic contaminants. The zeolite was initially activated using 2 M HCl and subsequently impregnated using 0.5 M Fe₂(SO₄)₃. The experimental variables included flow rates ranging from 400 to 1400 mL/min and adsorbent masses ranging from 350 to 550 g. Adsorbent characterization was performed using BET and SEM-EDS, while Cr(VI) and dye concentrations before and after adsorption were analyzed using UV-Vis spectrophotometry. The BET characterization results showed that HCl activation increased the specific surface area of the zeolite from 99.07 to 128.08 m²/g and the pore volume from 0.14 to 0.16 cm³/g, while the pore diameter remained relatively unchanged. The SEM-EDS results also confirmed the successful impregnation process, as the Fe content increased from 3.73 wt% in the activated zeolite to 9.12 wt% after impregnation, corresponding to an increase of approximately 144.5%. Adsorption performance showed that lower flow rates resulted in higher removal efficiencies of Cr(VI) and dyes due to the longer contact time between the wastewater and adsorbent. In contrast, increasing the adsorbent mass increased the number of available active sites, thereby enhancing the adsorption capacity. The optimum condition was obtained at an adsorbent mass of 550 g and a flow rate of 400 mL/min. Under these conditions, the Cr(VI) concentration decreased from 3.69 to 0.75 mg/L, while the dye concentration decreased from 978 to 198.8 Pt-Co. Therefore, under the optimum conditions, the concentrations of Cr(VI) and dyes met the quality standards applied in this study, namely 1 mg/L for Cr and 200 Pt-Co for color.
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > TP Chemical technology > TP155 Chemical engineering | ||||||||
| Divisions: | Faculty of Engineering > Departement of Chemical Engineering | ||||||||
| Depositing User: | EKA AYU LINTANG AMBARWATI | ||||||||
| Date Deposited: | 01 Sep 2026 03:27 | ||||||||
| Last Modified: | 01 Sep 2026 03:41 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/59448 |
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