Pengaruh Variasi pH pada Proses Adsorpsi Mikroplastik Polystyrene Menggunakan Komposit Activated Hydrochar/Zeolite-A dengan Metode Hidrotermal

Rabbani, Muhammad Hilmi and Nadila, Lisa Lailatul (2026) Pengaruh Variasi pH pada Proses Adsorpsi Mikroplastik Polystyrene Menggunakan Komposit Activated Hydrochar/Zeolite-A dengan Metode Hidrotermal. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pencemaran mikroplastik polystyrene (PS) menjadi salah satu masalah lingkungan karena bersifat persisten dan sulit terdegradasi. Penelitian ini bertujuan mensintesis komposit Activated Hydrochar/Zeolite-A (AHC-Z) sebagai adsorben, mengkarakterisasi sifat fisika-kimianya, mengevaluasi pengaruh pH terhadap adsorpsi mikroplastik PS, menganalisis kinetika adsorpsi menggunakan model Bohart–Adams, Thomas, dan Yoon–Nelson, serta mengkaji pengaruh regenerasi adsorben terhadap kinerjanya. Komposit disintesis dengan metode hidrotermal dan dikarakterisasi menggunakan FTIR, XRD, SEM, BET, serta Dynamic Light Scattering melalui pengukuran zeta potential. Kinerja adsorpsi diuji pada sistem continuous fixed-bed column dan dianalisis menggunakan spektrofotometri UV–Vis. Hasil menunjukkan bahwa komposit AHC-Z berhasil disintesis dengan luas permukaan spesifik 540,768 m²/g dan kristalinitas 71,45%, yang mendukung peningkatan kemampuan adsorpsi. Variasi pH memberikan pengaruh nyata, dengan kondisi optimum pada pH 3 yang menghasilkan kapasitas adsorpsi sebesar 8,571 mg/g. Nilai zeta potential mengindikasikan bahwa protonasi permukaan adsorben pada kondisi asam meningkatkan interaksi elektrostatik dengan mikroplastik PS. Ketiga model kinetika mampu menggambarkan kurva breakthrough dengan baik (R² = 0,901–0,989). Setelah regenerasi melalui pirolisis, adsorben masih mempertahankan kinerja adsorpsinya meskipun kapasitas adsorpsi menurun sebesar 40,247% dibandingkan adsorben awal.
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Polystyrene (PS) microplastic pollution has become a major environmental concern due to its persistent nature and resistance to degradation. This study aimed to synthesize an Activated Hydrochar/Zeolite-A (AHC-Z) composite as an adsorbent, characterize its physicochemical properties, evaluate the effect of pH on PS microplastic adsorption, analyze adsorption kinetics using the Bohart–Adams, Thomas, and Yoon–Nelson models, and investigate the effect of adsorbent regeneration on its adsorption performance. The composite was synthesized using the hydrothermal method and characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area analysis, and Dynamic Light Scattering (DLS) through zeta potential measurements. Adsorption performance was evaluated using a continuous fixed-bed column system and analyzed by UV–Vis spectrophotometry. The results showed that the AHC-Z composite was successfully synthesized, exhibiting a specific surface area of 540.768 m²/g and a crystallinity of 71.45%, which contributed to its enhanced adsorption performance. The solution pH significantly affected adsorption, with the optimum condition achieved at pH 3, resulting in an adsorption capacity of 8.571 mg/g. Zeta potential analysis indicated that surface protonation under acidic conditions enhanced electrostatic interactions between the adsorbent and PS microplastics. The Bohart–Adams, Thomas, and Yoon–Nelson models successfully described the breakthrough curves, with coefficients of determination (R²) ranging from 0.901 to 0.989. Following regeneration by pyrolysis, the adsorbent retained its adsorption capability, although the adsorption capacity decreased by 40.247% compared with the fresh adsorbent.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Activated Hydrochar/Zeolite-A, pH, Metode Hidrotermal, Adsorpsi Mikroplastik, Polystyrene Activated Hydrochar/Zeolite-A, pH, Hydrothermal Method, Microplastic Adsorption, Polystyrene.
Subjects:	T Technology > TP Chemical technology > TP155.7 Chemical processes.
Divisions:	Faculty of Vocational > 24305-Industrial Chemical Engineering
Depositing User:	Muhammad Hilmi Rabbani
Date Deposited:	28 Jul 2026 06:59
Last Modified:	28 Jul 2026 06:59
URI:	http://repository.its.ac.id/id/eprint/138578

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