Sintesis Hijau Tembaga-Aluminium-Asam Galat Bimetalik Metal-Organic Framework pada Suhu Ruang untuk Adsorpsi Metilen Biru dan Kongo Merah

Haezer, Ariel Seanhan (2026) Sintesis Hijau Tembaga-Aluminium-Asam Galat Bimetalik Metal-Organic Framework pada Suhu Ruang untuk Adsorpsi Metilen Biru dan Kongo Merah. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pencemaran air oleh pewarna tekstil kationik dan anionik sulit ditangani secara efektif karena perbedaan muatan, ukuran molekul, dan stabilitas kimianya. Penelitian ini bertujuan mensintesis adsorben berpori CuAl–GA bimetallic metal–organic framework (BMOF) berbasis ligan asam galat melalui aqueous synthesis pada suhu ruang serta mengevaluasi karakteristik dan kinerjanya. Variasi rasio Cu:Al (1:0 hingga 0:1) menunjukkan bahwa komposisi ekuimolar (1:1) memberikan pengaruh signifikan terhadap integritas struktur dengan mencegah distorsi kristal dan pembentukan fasa amorf, menghasilkan indeks kristalinitas tertinggi (75,02%). Selanjutnya, optimasi agen deprotonasi NaOH (0–1,1 M) mengungkapkan bahwa konsentrasi 0,825 M adalah titik kritis untuk mencapai yield optimum sebesar 55,56%. Karakterisasi material optimum menunjukkan morfologi agregat nanokristalin dengan stabilitas termal tinggi hingga 352,5°C. Analisis tekstural mengonfirmasi struktur mesopori dengan luas permukaan spesifik (SBET) sebesar 122,18 m2/g, volume pori 0,258 cm3/g, dan diameter pori rata-rata 8,44 nm (pHpzc 3,81). Evaluasi performa adsorpsi terhadap metilen biru (MB) dan kongo merah (CR) menunjukkan kondisi optimum tercapai pada pH 11 (MB) dan pH 3 (CR). Studi adsorpsi mengonfirmasi mekanisme mengikuti kinetika pseudo-second order dan model isoterm Sips dengan kapasitas maksimum (qmax) sebesar 1733,16 mg/g untuk CR dan 347,58 mg/g untuk MB. Tinjauan termodinamika menunjukkan proses adsorpsi berlangsung secara spontan, bersifat endotermis untuk MB dan eksotermis untuk CR. Uji regenerasi lima siklus membuktikan stabilitas material dengan efisiensi yang tetap tinggi (MB 96,13%; CR 99,06%), menegaskan potensi CuAl–GA BMOF sebagai adsorben yang efektif dan dapat digunakan kembali.
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Water pollution caused by cationic and anionic textile dyes is challenging to treat effectively due to differences in charge, molecular size, and chemical stability. This study aims to synthesize a porous CuAl–GA bimetallic metal–organic framework (BMOF) adsorbent based on gallic acid ligand via room-temperature aqueous synthesis and evaluate its characteristics and performance. Variations in Cu:Al ratios (1:0 to 0:1) demonstrated that the equimolar composition (1:1) significantly influenced structural integrity by preventing crystal distortion and amorphous phase formation, yielding the highest crystallinity index (75.02%). Furthermore, optimization of the deprotonating agent NaOH (0–1.1 M) revealed that a concentration of 0.825 M was the critical point to achieve an optimum yield of 55.56%. Characterization of the optimum material exhibited nanocrystalline aggregate morphology with high thermal stability up to 352.5°C. Textural analysis confirmed a mesoporous structure with a specific surface area (SBET) of 122.18 m2/g, pore volume of 0.258 cm3/g, and average pore diameter of 8.44 nm (pHpzc 3.81). Evaluation of adsorption performance for Methylene Blue (MB) and Congo Red (CR) showed optimum conditions were reached at pH 11 (MB) and pH 3 (CR). Adsorption studies confirmed the mechanism followed pseudo-second-order kinetics and the Sips isotherm model with maximum capacities (qmax) of 1733.16 mg/g for CR and 347.58 mg/g for MB. Thermodynamic review indicated the adsorption process occurred spontaneously, being endothermic for MB and exothermic for CR. Five-cycle regeneration tests proved material stability with retained high efficiencies (MB 96.13%; CR 99.06%), confirming the potential of CuAl–GA BMOF as an effective and reusable adsorbent.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	CuAl-GA BMOF, Asam galat, Metilen biru, Kongo merah, Adsorpsi CuAl-GA BMOF, Gallic acid, Methylene blue, Congo red, Adsorption
Subjects:	Q Science > QC Physics > QC162 Adsorption and absorption Q Science > QD Chemistry T Technology > TP Chemical technology
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Chemical Engineering > 24101-(S2) Master Thesis
Depositing User:	Ariel Seanhan Haezer
Date Deposited:	03 Feb 2026 02:38
Last Modified:	03 Feb 2026 02:38
URI:	http://repository.its.ac.id/id/eprint/131649

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