Tiara , Zalfa Nur'alifah (2025) KAJIAN ADSORPSI ZAT WARNA CONGO RED DAN METIL ORANYE OLEH BIOMASSA Nannochloropsis sp. TERMODIFIKASI SURFAKTAN KATIONIK. FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM , UNIVERSITAS LAMPUNG .
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Abstract
Pada penelitian ini telah dilakukan adsorpsi zat warna congo red (CR) dan metil oranye (MO) oleh adsorben alga Nannochloropsis sp. yang telah dimodifikasi dengan CaCl2 dan surfaktan kationik HDTMA-Br. Adsorben hasil modifikasi dikarakterisasi menggunakan spektrometer Fourier Transform Infrared (FTIR) untuk mengidentifikasi gugus fungsi dan Scanning Electron Microscopy with Energi Dispersive X-Ray (SEM-EDX) untuk menganalisis morfologi permukaan dan komposisi unsur dalam adsorben. Kadar zat warna CR dan MO dianalisis dengan menggunakan spektrofotometer UV-Vis. Adsorpsi zat warna CR dan MO optimum terjadi pada dosis Alga-N, Alga-N-Ca dan Alga-N-HDTMA sebanyak 0,2 g dan konsentrasi 400 ppm. Lebih lanjut pH optimum adsorpsi CR dari adsorben Alga-N, Alga-N-Ca dan Alga-N-HDTMA masing-masing adalah 8, 10 dan 7 sedangkan untuk MO adalah 9, 10 dan 8. Waktu kontak optimum untuk Alga-N dan Alga-N-Ca adalah 30 menit sedangkan untuk Alga-N-HDTMA 45 menit. Isoterm adsorpsi Alga-N dan Alga-N-Ca cenderung mengikuti model isoterm Freundlich, sementara Alga-N-HDTMA mengikuti model isoterm Langmuir. Adsorben Alga- N-HDTMA dapat digunakan secara berulang untuk adsorpsi CR hingga 3 siklus sedangkan untuk adsorpsi MO hingga 6 siklus dengan % teradsorpsi >50%. Kata kunci: alga, Nannochloropsis sp., adsorpsi, desorpsi, surfaktan kationik. In this study, the adsorption of the dyes Congo Red (CR) and Methyl Orange (MO) was carried out using Nannochloropsis sp. algae modified with CaCl2 and the cationic surfactant HDTMA-Br as adsorbents. The modified adsorbents were characterized using Fourier Transform Infrared Spectroscopy (FTIR) to identify functional groups and Scanning Electron Microscopy with Energy Dispersive X- Ray (SEM-EDX) to analyze surface morphology and elemental composition. The concentrations of CR and MO dyes were determined using a UV-Vis spectrophotometer. Optimal adsorption of CR and MO occurred with 0.2 g of Alga- N, Alga-N-Ca, and Alga-N-HDTMA adsorbents at a dye concentration of 400 ppm. Furthermore, the optimum pH for CR adsorption using Alga-N, Alga-N-Ca, and Alga-N-HDTMA was 8, 10, and 7, respectively, while for MO it was 9, 10, and 8. The optimum contact time for Alga-N and Alga-N-Ca was 30 minutes, whereas for Alga-N-HDTMA it was 45 minutes. The adsorption isotherms of Alga-N and Alga- N-Ca tended to follow the Freundlich isotherm model, while Alga-N-HDTMA followed the Langmuir isotherm model. The Alga-N-HDTMA adsorbent could be reused for up to three cycles for CR adsorption and up to six cycles for MO adsorption, with an adsorption efficiency > 50%. Keywords: algae, Nannochloropsis sp., adsorption, desorption, cationic surfactant.
| Item Type: | Other |
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| Subjects: | ?? 540 ?? |
| Divisions: | Fakultas MIPA > Prodi Kimia |
| Depositing User: | UPT . Siswanti |
| Date Deposited: | 23 Oct 2025 04:44 |
| Last Modified: | 23 Oct 2025 04:44 |
| URI: | http://digilib.unila.ac.id/id/eprint/91811 |
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