Update Artikelilmiah: 54194

HANUM YUNITA

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Abstrak (Bhs. Indonesia)

Limbah zat warna malachite green (MG) merupakan salah satu pencemar yang sulit terdegradasi dan berpotensi membahayakan lingkungan. Adsorpsi menggunakan adsorben berbasis bahan alam menjadi salah satu metode yang efektif dan ramah lingkungan. Penelitian ini bertujuan mengisolasi asam humat dari tanah gambut Rawa Pening, ambarawa memodifikasinya dengan α-selulosa melalui metode kopresipitasi menggunakan ion Ca²+ dan Fe3+, serta mengevaluasi karakteristik dan kemampuan adsorpsinya terhadap malachite green. Karakterisasi dilakukan menggunakan Fourier Transform Infrared (FTIR) dan Scanning Electron Microscopy (SEM). Studi adsorpsi meliputi variasi komposisi adsorben, pH, waktu kontak, dan konsentrasi awal larutan, sedangkan analisis kinetika dan isoterm dilakukan menggunakan model Pseudo First Order (PFO), Pseudo Second Order (PSO), Langmuir, dan Freundlich. Asam humat hasil isolasi memiliki rendemen 4,8%, keasaman total 680 cmol/kg, gugus karboksilat 150 cmol/kg, dan gugus hidroksil fenolat 530 cmol/kg. Kondisi optimum adsorpsi diperoleh pada komposisi asam humat/ α-selulosa 1:0,5 dan pH 7 dengan efisiensi adsorpsi 89,7072% serta kapasitas adsorpsi 22,5152 mg/g. Proses adsorpsi mengikuti model kinetika Pseudo Second Order (R2 = 0,99887) dan isoterm Freundlich (R² = 0,9867), dan energi adsorpsi sebesar -6,07 kJ/mol yang menunjukkan interaksi adsorpsi cenderung berlangsung secara spontan dengan adsorpsi fisisorpsi pada permukaan heterogen. Komposit asam humat termodifikasi α-selulosa berpotensi sebagai adsorben ramah lingkungan untuk menghilangkan malachite green dari larutan.

Abtrak (Bhs. Inggris)

Malachite green (MG) is a synthetic dye that poses environmental risks due to its persistence and toxicity. Adsorption using natural-based adsorbents is considered an effective and environmentally friendly treatment method. This study aimed to isolate humic acid from Rawa Pening peat soil, modify it with α-cellulose through a coprecipitation method using Ca²⁺ and Fe³⁺ ions, and evaluate its characteristics and adsorption performance toward malachite green. The adsorbent was characterized using Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Adsorption experiments were conducted by varying the adsorbent composition, solution pH, contact time, and initial dye concentration, while the adsorption kinetics and isotherms were analyzed using the Pseudo-First-Order (PFO), Pseudo-Second-Order (PSO), Langmuir, and Freundlich models. The isolated humic acid showed a yield of 4.8%, total acidity of 680 cmol/kg, carboxyl group content of 150 cmol/kg, and phenolic hydroxyl group content of 530 cmol/kg. The optimum adsorption conditions were obtained at a humic acid/α-cellulose ratio of 1:0.5 and pH 7, achieving an adsorption efficiency of 89.7072% and an adsorption capacity of 22.5152 mg/g. The adsorption process followed the Pseudo-Second-Order kinetic model (R² = 0.99887), and the Freundlich isotherm model (R² = 0.9867), and an adsoption energy of -6,04 kJ/mol, indicating that the adsorpption process tends to occur spontaneusly through physisorption on a heterogeneous surface. The α-cellulose-modified humic acid composite has potential as an environmentally friendly adsorbent for removing malachite green from aqueous solutions.

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