SINTESIS NANOMATERIAL MAGNETIT TERMODIFIKASI EKSTRAK LIMBAH KULIT JERUK MANIS (Citrus sinensis) DAN APLIKASINYA SEBAGAI MEDIA FILTER AIR LIMBAH DENGAN KOMBINASI ARANG AKTIF DAN ZEOLIT

Rini Maulida, NIM.: 22106030026 (2026) SINTESIS NANOMATERIAL MAGNETIT TERMODIFIKASI EKSTRAK LIMBAH KULIT JERUK MANIS (Citrus sinensis) DAN APLIKASINYA SEBAGAI MEDIA FILTER AIR LIMBAH DENGAN KOMBINASI ARANG AKTIF DAN ZEOLIT. Skripsi thesis, UIN SUNAN KALIJAGA YOGYAKARTA.

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Abstract

Household laundry waste contains various pollutants that can be measured using COD, TSS, TDS, surfactants, pH, and temperature parameters, thus potentially polluting the environment. This study aims to synthesize Fe₃O₄-CS nanomaterials through the reverse coprecipitation method, characterize them, and apply them as a wastewater filtration medium with a combination of activated charcoal and zeolite. The synthesis of Fe₃O₄-CS was carried out by mixing FeCl₃·6H₂O and FeSO₄·7H₂O into NaOH and adding orange peel extract as a stabilizer and capping agent. The synthesis results were characterized using FTIR, XRD, and SEM-EDX. The FTIR spectrum results showed the presence of typical absorption peaks of magnetite and organic groups of orange peel extract. The XRD diffractogram showed the formation of a pure magnetite phase in accordance with JCPDS No. 19-0629 with an average crystal size of 7.09 nm. The SEM results showed irregular particle morphology with a size of 833 nm with a rough surface, while EDX confirmed the elemental composition of Fe, O, and C which indicated the successful coating of organic compounds from orange peel. The application of Fe₃O₄-CS as a filtration medium showed improved performance compared to filter media without Fe₃O₄- CS. COD decreased from 1300 mg/L to 855 mg/L, TSS decreased from 292 mg/L to 197 mg/L, and detergent content decreased from 260 mg/L to 140 mg/L. Meanwhile, TDS decreased relatively slightly from 909 mg/L to 855 mg/L. The pH and temperature of the wastewater after filtration remained within the safe range according to quality standards. The interaction mechanism between pollutants and Fe₃O₄-CS is thought to involve electrostatic interactions, hydrogen bonds, and π–π interactions. Regeneration tests of up to five cycles showed that filtration efficiency fluctuated but was not significant, indicating that the Fe₃O₄-CS media still has potential for reuse.

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