Akmal, Muhammad Fairuz (2026) Analisis Efektivitas Adsorpsi Kromium Limbah Cair Laboratorium Menggunakan Adsorben Komersial Dengan Pendekatan Kinetika. Undergraduate thesis, Universitas Pembangunan Nasional "Veteran" Jawa Timur.
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Abstract
Laboratories are important contributors to hazardous and toxic (B3) liquid waste, often containing chemical residues such as chromium, while Hexavalent Chromium (Cr(VI)) contamination poses a significant environmental risk because of its toxic and carcinogenic characteristics. This study evaluated the effectiveness of Cr(VI) adsorption using three natural-based adsorbentsnZeolite, Silica, and Clay Ceramics activated with hydrochloric acid (HCl), with experiments carried out in a batch system at pH 5 under varying contact times. The results demonstrated that Zeolite achieved the highest removal efficiency at 56.28%, followed by Silica at 54.98% and Clay Ceramics at 53.03%, with an optimum contact time of 75 minutes. Kinetic analysis showed that adsorption for all adsorbents followed the Pseudo-Second-Order (PSO) model, indicating that the rate was controlled by the availability of active surface sites, while Gibbs free energy values were calculated at −16.18 kJ/mol for Zeolite, −16.16 kJ/mol for Silica, and −15.85 kJ/mol for Clay Ceramics. These findings were further supported by slight shifts in FTIR wavenumbers (from 1084 to 1052 cm⁻¹ for Zeolite), leading to the conclusion that the adsorption mechanism was dominated by physisorption through electrostatic interactions and ion exchange between the protonated adsorbent surface and chromate anions, without the formation of permanent covalent bonds.
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > TD Environmental technology. Sanitary engineering | ||||||||
| Divisions: | Faculty of Engineering > Departement of Environmental Engineering | ||||||||
| Depositing User: | Muhammad Fairuz Akmal | ||||||||
| Date Deposited: | 26 Feb 2026 04:58 | ||||||||
| Last Modified: | 26 Feb 2026 04:58 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/49837 |
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