Malaysian Journal of Analytical Sciences Vol 24 No 1 (2020): 21 - 32

 

 

 

 

KINETIC STUDIES AND ABSORPTION ISOTHERMAL OF METHYLENE BLUE BY USING N,O-CARBOXYMETHYL CHITOSAN

 

(Kajian Kinetik dan Isoterma Serapan Metilena Biru Menggunakan N,O-Karboksimetil Kitosan)

 

Putri Amirah Solehin Sulizi and Nadhratun Naiim Mobarak*

 

Department of Science Chemistry, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

*Corresponding author:  nadhratunnaiim@ukm.edu.my

 

 

Received: 11 June 2019; Accepted: 11 December 2019

 

 

Abstract

The potential of carboxymethyl chitosan as a low-cost and effective adsorbent for removal of methylene blue (MB) from aqueous solution has been investigated. N,O-carboxymethyl chitosan (N,O-CMCTS) was synthesized by reacting chitosan with monochloroacetic acid. The presence of a carboxymethyl group on carboxymethyl chitosan structure was demonstrated by Fourier Transform Infrared (FTIR) spectroscopy, with the presence of peaks at 1587 cm^-1 and 1408 cm^-1 assigned to the asymmetrical and symmetrical stretching vibrations of carboxylate anions (-COO^-). ¹H nuclear magnetic resonance (NMR) results confirm that O-, N- substituted carboxymethyl chitosan was synthesized, as the presence of peaks at 3.987 and 3.275 ppm that represent the substitution of carboxymethylation occurred at both hydroxyl and amino groups of chitosan. The influence of parameters such as initial dye concentration, sorbent dosage and sorption time on the sorption capacity were studied using the batch method. The results showed that maximum sorption capacity N,O-CMCTS was 0.549 mg/g.  The concentration of methylene blue and the quantity of N,O-CMCTS were important in the absorption process, as the kinetic data followed pseudo second order. The sorption of methylene blue on N,O-CMCTS was via chemisorption, as in the isothermal studies, it followed Freundlich model.

 

Keywords:  N,O-carboxymethyl chitosan, methylene blue, isotherms, kinetic

 

Abstrak

Potensi karboksimetil kitosan sebagai penjerap kos rendah dan efektif untuk menyingkirkan metilena biru (MB) dalam larutan akueus telah dikaji. N,O-karboksimetil kitosan (N,O-CMCTS) telah di sintesis melalui tindak balas kitosan dengan asid monokloroasetik. Kehadiran kumpulan karboksimetil pada struktur karboksimetil kitosan telah dibuktikkan dengan keputusan spektroskopi inframerah transformasi Fourier (FTIR) di mana kehadiran puncak pada 1587 cm^-1 dan 1408 cm^-1 yang menunjukkan getaran regangan asimetri dan simetri bagi anion karboksilat (-COO^-). Keputusan ¹H resonans magnet nukleus (NMR) mengesahkan penggantian O-, N- karboksimetil kitosan telah di sintesis dengan kehadiran puncak pada 3.987 dan 3.275 ppm yang menunjukkan penggantian pengkarboksimetil terjadi pada kedua-dua kumpulan hidroksil dan amino pada kitosan. Parameter yang mempengaruhi seperti kepekatan awal pewarna, dos penjerap dan masa erapan terhadap kapasiti erapan telah dikaji menggunakan kaedah kelompok. Keputusan menunjukkan kapasiti erapan maksima N,O-CMCTS adalah 0.549 mg/g. Dari kajian ini, kepekatan metilena biru dan kuantiti N,O-CMCTS adalah penting bagi proses serapan di mana data kinetik mengikut tertib pseudo kedua. Selain itu, erapan metilena biru pada N,O-CMCTS secara jerapan kimia serta ujian isoterma mengikut model Freundlich.  

 

Kata kunci:  N,O-karboksimetil kitosan, metilena biru, isoterma, kinetik

 

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