Kinetika Adsorpsi Mikrokapsul Kitosan Taut Silang Kalium Persulfat terhadap Zat Warna Methyl Orange

https://doi.org/10.22146/jrekpros.50634

Endang Sulistyawati(1*), Wibiana Wulan Nandari(2), Arifa Rahma Nurchasanah(3), Kurnia Kumala Dewi(4)

(1) Program Studi Teknik Kimia, FTI, UPN “Veteran” Yogyakarta, Jl. SWK 104 (Lingkar Utara), Condongcatur, Yogyakarta – 55283
(2) Program Studi Teknik Kimia, FTI, UPN “Veteran” Yogyakarta, Jl. SWK 104 (Lingkar Utara), Condongcatur, Yogyakarta – 55283
(3) Program Studi Teknik Kimia, FTI, UPN “Veteran” Yogyakarta, Jl. SWK 104 (Lingkar Utara), Condongcatur, Yogyakarta – 55283
(4) Program Studi Teknik Kimia, FTI, UPN “Veteran” Yogyakarta, Jl. SWK 104 (Lingkar Utara), Condongcatur, Yogyakarta – 55283
(*) Corresponding Author

Abstract


Dyes, typically available in textile and paper industries, can cause an aesthetical issue in their wastewater stream even in its low concentration Some colors are considered toxic to the environment and even carcinogenic. In that sense, the adsorption using chitosan, might be an alternative method offering better environmental quality by its capability for eliminating the dyes from the waste stream. This research was aimed to study the adsorption kinetics of methyl orange dyes in the presence of chitosan microcapsules, employing the measurement of concentration concerning time over several measured temperatures of 40, 50, and 60 °C. Chitosan microcapsules originated from abundantly available organic materials, have been synthesized by the support of potassium persulfate as a cross-linker through ionic gelation and solvent evaporation method. The microcapsules were subjected to Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) characterizations, while UV-Vis was utilized for observing dye concentration changes. The results showed that chitosan microcapsules had been successfully prepared with a deacetylation degree of 53.92 % and a grain diameter of 1246 μm. The adsorption adapted the chemisorption mechanism with endothermic behavior. Besides, its kinetics seemed to follow the Lagergren pseudo-second-order equation with the value of the kinetic constant suitable for the tested temperature, following the Arrhenius equation.

 

A B S T R A K

Zat pewarna yang banyak ditemukan di industri tekstil dan kertas, cenderung menyebabkan masalah estetika dalam aliran air limbah meskipun dalam jumlah rendah. Beberapa zat pewarna bersifat racun bagi lingkungan dan bahkan ada yang tergolong zat karsinogen. Adsorpsi, terutama dengan memanfaatkan kitosan, dapat digunakan sebagai metode alternatif yang memberikan kualitas lingkungan yang lebih baik dalam menghilangkan zat warna dari aliran limbah. Penelitian ini bertujuan untuk mempelajari kinetika adsorpsi pewarna metil oranye menggunakan kitosan dalam bentuk mikrokapsul, dengan mengamati perubahan konsentrasi sebagai fungsi waktu pada beberapa suhu teruji yaitu 40, 50, dan 60 °C. Mikrokapsul kitosan berasal dari bahan organik yang tersedia berlimpah dan disintesis dengan bantuan kalium persulfat sebagai penaut silang dengan menggunakan metode gelasi ionik dan metode penguapan pelarut. Karakteristik mikrokapsul dianalisis menggunakan spektroskopi Fourier transform infrared (FT-IR) dan scanning electron microscopy (SEM), sedangkan UV-Vis digunakan untuk mengamati perubahan konsentrasi zat warna. Hasil penelitian menunjukkan, mikrokapsul kitosan yang berhasil disintesis mempunyai derajat deasetilasi 53,92% dan diameter butir sekitar 1246 μm. Adsorpsi mengikuti mekanisme kemisorpsi dengan perilaku endotermik. Persamaan kinetik mengikuti persamaan Lagergren orde dua-semu dengan nilai konstanta kinetik untuk suhu yang diuji mengikuti persamaan Arrhenius.


Keywords


khemisorpsi; kitosan; Lagergren; mikrokapsul; orde dua semu; taut silang

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DOI: https://doi.org/10.22146/jrekpros.50634

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