Update Artikelilmiah: 36799

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Abstrak (Bhs. Indonesia)

Perkembangan industri tidak hanya berdampak positif namun juga berdampak negatif seperti munculnya permasalahan limbah logam berat Pb (II). Tujuan penelitian ini yaitu untuk mengetahui kemampuan karboksimetil kitosan magnetik (CMCts-M) sebagai adsorben dalam mengadsorpsi logam berat Pb (II). CMCts-M disintesis dengan mereaksikan karboksimetil kitosan (CMCts) dan magnetit (Fe3O4) yang divariasikan pada perbandingan mol Fe2+/Fe3+ yaitu (1:2) dan (1:3). CMCts-M1 adalah hasil sintesis CMCts dengan Fe3O4 (1:2) sedangkan CMCts-M2 hasil sintesis CMCts dengan Fe3O4 (1:3) Hasil sintesis CMCts, CMCts-M1, dan CMCts-M2 akan dikarakterisai menggunakan instrumen FTIR sedangkan Fe3O4 menggunakan XRD. Adsorben CMCts-M1 dan CMCts-M2 kemudian dilakukan studi adsorpsi dengan memvariasikan pH, waktu kontak, dan konsentrasi ion awal. Adsorben dengan kapasitas adsorpsi terbesar yaitu CMCts-M1 kemudian dikarakterisasi menggunakan BET dan XRD. Senyawa CMCts-M1 dan CMCts-M2 yang dihasilkan berupa padatan berwarna hitam dengan nilai rata-rata rendemen berturut-turut sebesar 50,5 dan 47,3%. Analisis spektrum IR pada CMCts-M1 dan CMCts-M2 menunjukkan adanya serapan pada bilangan gelombang 3422 dan 1594 cm-1 yang menunjukkan adanya gugus -OH dan C=O serta serapan eter atau vibrasi ulur C-O pada bilangan gelombang 1000-1300 cm-1. Selain itu, terdapat serapan pada bilangan gelombang disekitar 569 cm-1 dan 469 cm-1 yang merupakan serapan Fe-O dan Si-O. Analisis XRD menunjukkan hasil sintesis merupakan Fe3O4 dengan struktur kubik. Hasil studi adsorpsi diperoleh kondisi optimum adsorpsi ion logam Pb (II) oleh CMCts-M1 dan CMCts-M2 pada pH 3, waktu kontak 10 menit, dan mengikuti kinetika adsorpsi psudo orde dua. Kapasitas adsorbsi maksimum (qmaks) CMCts-M1 dan CMCts-M2 berturut-turut sebesar 239 dan 42,12 mg/g mengikuti model isoterm adsorpsi Langmuir. Hasil desorpsi CMCts-M1 dan CMCts-M2 dengan lima kali pengulangan berada pada rentang 29-12% dan 43-16%. Analisis XRD CMCts-M1 memiliki sudut difraksi yang sama dengan Fe3O4 (1:2) namun pada CMCts-M1 muncul peak fase amorf yang mengindikasikan Fe3O4 diselimuti oleh CMCts. menunjukkan hasil sintesis merupakan Fe3O4 dengan struktur kubik. Berdasarkan analisis BET luas permukaan, ukuran pori, volume total pori CMCts-M1 masing-masing sebesar 84,382 m2/g; 6,0 nm; dan 2,518x10-1 cm3/g.

Abtrak (Bhs. Inggris)

Industrial development not only have positive and negative impact such as the emergence of the problem of Pb (II) heavy metal waste. The purpose of this study was to determine the ability of magnetic carboxymethyl chitosan (CMCts-M) as an adsorbent to adsorb heavy metal Pb (II). CMCts-M was synthesized by reacting carboxymethyl chitosan (CMCts) and magnetite (Fe3O4) with various mole ratios of Fe2+/Fe3+ (1:2) and (1:3). CMCts-M1 is the result of the synthesis of CMCts with Fe3O4 (1:2) while CMCts-M2 is the result of the synthesis of CMCts with Fe3O4 (1:3) The results of the synthesis of CMCts, CMCts-M1, and CMCts-M2 will be characterized using an FTIR instrument while Fe3O4 will be characterized by XRD. The adsorbents CMCts-M1 and CMCts-M2 were then studied by varying the pH, contact time, and initial ion concentration. The adsorbent with the largest adsorption capacity, namely CMCts-M1 was then characterized using BET and XRD. The CMCts-M1 and CMCts-M2 compounds produced were black solids with an average yield value of 50.5 and 47.3%, respectively. IR spectrum analysis on CMCts-M1 and CMCts-M2 showed absorption at wave numbers 3422 and 1594 cm-1 which indicated the presence of -OH and C=O groups as well as ether absorption or C-O stretching vibrations at wave numbers 1000-1300 cm-1. In addition, there are absorptions at wave numbers around 569 cm-1 and 469 cm-1 which are Fe-O and Si-O absorptions. XRD analysis showed that the synthesis result was Fe3O4 with cubic structure. The results of the adsorption study obtained the optimum conditions for the adsorption of Pb (II) metal ions by CMCts-M1 and CMCts-M2 at pH 3, a contact time of 10 minutes, and followed the second-order pseudo adsorption kinetics. The maximum adsorption capacity (qmax) of CMCts-M1 and CMCts-M2 were 239 and 42.12 mg/g, respectively, following the Langmuir adsorption isotherm model. The results of desorption of CMCts-M1 and CMCts-M2 with five repetitions were in the range of 29-12% and 43-16%. XRD analysis of CMCts-M1 has the same diffraction angle as Fe3O4 (1:2) but in CMCts-M1 an amorphous phase appears which indicates Fe3O4 is covered by CMCts. showed that the result of the synthesis was Fe3O4 with a cubic structure. Based on BET analysis, the surface area, pore size, and total pore volume of CMCts-M1 were 84,382 m2/g, respectively; 6.0 nm; and 2.518x10-1 cm3/g.

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