Kinerja Adsorben nZVI dan SiO2 Dalam Proses Penyisihan Antibiotik Enrofloxacin

Azzahra, Maharesmi Listya (2026) Kinerja Adsorben nZVI dan SiO2 Dalam Proses Penyisihan Antibiotik Enrofloxacin. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kontaminasi residu antibiotik dalam limbah cair, khususnya dari sektor peternakan seperti enrofloxacin (ENR), menjadi masalah lingkungan serius karena sifatnya yang stabil secara kimia, sulit terurai secara alami, serta berpotensi menyebarkan gen resistensi antibiotik. Metode adsorpsi merupakan teknologi pengolahan yang unggul, di mana nanoscale zero valent iron (nZVI) sering digunakan sebagai media remediasi karena reaktivitasnya yang tinggi dan luas permukaan yang besar. Namun, nZVI murni memiliki keterbatasan berupa kecenderungan agregasi dan oksidasi cepat. Penelitian ini mengusulkan penggunaan silika (SiO2) sebagai adsorben alternatif yang berasal dari pemanfaatan limbah sandblasting dan juga penggunaan nZVI untuk dievaluasi kinerjanya dalam penyisihan ENR dari larutan.
Tujuan dari penelitian ini adalah untuk menganalisis karakterisasi material, menilai efektivitas penyisihan ENR, serta mengevaluasi pengaruh pH dan waktu kontak dalam proses adsorpsi. Karakterisasi material dilakukan melalui uji Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray (EDX), Fourier Transform Infrared (FTIR), dan Brunauer Emmett Teller (BET). Pengujian adsorpsi dilakukan menggunakan batch sistem dengan variasi pH (3, 4, dan 5), konsentrasi ENR (2, 5, dan 10 mg/L), dan waktu pengambilan sampel hingga 60 menit. Analisis performa fotokatalisis dilakukan dengan spektrofotometri UV-Vis dan dikonfirmasi menggunakan High Performance Liquid Chromatography (HPLC) untuk memberikan ketelitian yang lebih tinggi.
Hasil pengamatan fisik menunjukkan bahwa silika (SiO2), nZVI, dan komposit nZVI-SiO2 yang berhasil disintesis berwarna putih, coklat tua, dan hitam pekat. Hasil dari uji karakteristik baru dilakukan untuk material Silika (SiO2). Hasil dari uji SEM diketahui ukuran rata-rata partikel SiO2, nZVI, dan komposit nZVI-SiO2 masing-masing sebesar 47366 nm, 1630 nm, dan 10940 nm. Pada material silika (SiO2) luas permukaan spesifik 278,721 m2/g dan diameter pori 0,76 cm3/g. Removal efficiency silika (SiO2) terhadap larutan ENR optimal pada konsentrasi 5 mg/L dengan nilai 96,18%. Sedangkan pada material nZVI memiliki removal efficiency sebesar 77,82% pada konsentrasi 5 mg/L pada pH 3. Plot isotermal adsorpsi pada material silika mengikuti model isotermal Freundlich yang menunjukkan bahwa adsorpsi berlangsung pada permukaan heterogen. Kinetika adsorpsi pada material silika mengikuti model pseudo second order, yang mengindikasikan bahwa proses adsorpsi dikendalikan oleh mekanisme kimia (chemisorption).
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Antibiotic residue contamination in wastewater, particularly from the livestock sector such as enrofloxacin (ENR) poses a serious environmental problem due to its chemical stability, resistance to natural degradation, and potential to spread antibiotic resistance genes. Adsorption is a superior treatment technology, in which nanoscale zero valent iron (nZVI) is often used as a remediation medium due to its high reactivity and large surface area. However, pure nZVI has limitations in the form of a tendency to aggregate and undergo rapid oxidation. This study proposes the use of silica (SiO₂) as an alternative adsorbent derived from sandblasting waste, as well as the use of nZVI, to evaluate their performance in removing ENR from solutions.
The objectives of this study are to analyze material characterization, assess the effectiveness of ENR removal, and evaluate the effects of pH and contact time on the adsorption process. The research methods included the synthesis of nanocomposites using an in-situ technique. Material characterization was performed using Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray (EDX), Fourier Transform Infrared (FTIR), and Brunauer-Emmett-Teller (BET). Adsorption testing was conducted using a batch system with variations in pH (3, 4, and 5), ENR concentration (2, 5, and 10 mg/L), and sampling time up to 60 minutes. Photocatalytic performance analysis was performed using UV-Vis spectrophotometry and confirmed using High-Performance Liquid Chromatography (HPLC) to ensure higher precision.
Physical observations showed that the successfully synthesized silica (SiO₂), nZVI, and nZVI-SiO₂ composite were white, dark brown, and jet black, respectively. New characterization tests were conducted on the silica (SiO₂) material. SEM test results revealed that the average particle sizes of SiO₂, nZVI, and the nZVI-SiO₂ composite were 47,366 nm, 1,630 nm, and 10,940 nm, respectively. For the silica (SiO₂) material, the specific surface area was 278.721 m²/g and the pore volume was 0.76 cm³/g. The removal efficiency of silica (SiO₂) for ENR solutions was optimal at a concentration of 5 mg/L, with a value of 96.18%. Meanwhile, nZVI exhibits a removal efficiency of 77.82% at a concentration of 5 mg/L at pH 3. The adsorption isotherm plot for silica follows the Freundlich isotherm model, indicating that adsorption occurs on a heterogeneous surface. The adsorption kinetics of the silica material follow the pseudo-second-order model, indicating that the adsorption process is controlled by a chemical mechanism (chemisorption).

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Adsorpsi, ENR, Komposit, Nanoscale Zero-Valent Iron (nZVI), Silika Oksida (SiO2) Adsorption, ENR, Composite, Nanoscale Zero-Valent Iron (nZVI), Silicon Dioxide (SiO2)
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD420 Water pollution
Divisions:	Faculty of Civil Engineering and Planning > Environment Engineering > 25201-(S1) Undergraduate Thesis
Depositing User:	Maharesmi Listya Azzahra
Date Deposited:	28 Jul 2026 07:31
Last Modified:	28 Jul 2026 07:31
URI:	http://repository.its.ac.id/id/eprint/138733

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