Malaysian Journal of Analytical Sciences Vol 25 No 5 (2021): 848 - 857

 

 

 

 

CHITOSAN-LIGNIN COMPOSITE FOR RECOVERY OF LANTHANUM (III) IONS FROM AQUEOUS SOLUTIONS

 

(Kitosan-Lignin Komposit untuk Perolehan Semula Lanthanum (III) Ion Dari Larutan Akueus)

 

Shariff Ibrahim¹*, Nur Shuhaidah Shamsul Kamal¹, Megat Ahmad Kamal Megat Hanafiah², Noorul Farhana Md Ariff¹, Sabiha Hanim Saleh¹

 

¹School of Chemistry and Environment, Faculty of Applied Sciences,

Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

²Faculty of Applied Sciences,

Universiti Teknologi MARA, 264000 Jengka, Pahang, Malaysia

 

*corresponding author:  sha88@uitm.edu.my

 

 

Received:  5 July 2021; Accepted: 6 October 2021; Published:  25 October 2021

 

 

Abstract

A chitosan-lignin composite was prepared, characterised, and applied as an effective adsorbent to recover precious rare earth La(III) ions. The characterisation studies revealed that the chitosan-lignin composite consisted of slightly acidic groups, as both pH_ZPC and pH of the slurry were 6.17 and 5.47, respectively. The specific surface area of the composite was found to be 1.41 m² g^-1 using Brunauer Emmett Teller (BET), which was lower than the raw chitosan surface area. The FTIR spectrum showed the disappearance of the primary amine peak of chitosan at 1648 cm^-1 due to interaction with the benzene ring in lignin. Factors influencing La(III) adsorption behaviour include the pH of the solution, adsorbent dosage, concentration, and contact time. The maximum adsorption of La(III) was at pH 4 with an adsorbent dosage of 0.5 g L^-1. The Langmuir isotherm model fitted well to the experimental isotherm data, with R² = 0.99. The maximum adsorption capacity of the chitosan-lignin composite was 500 mg g^-1 at 300 K. A competitive ion experiment revealed Ce(III) ions, another lanthanide group member, adsorbed more than La(III) when both metal ions were mixed in a binary system. Maximum desorption of 90% La(III) was noted with Na₂EDTA as the desorbing agent.

 

Keywords:  adsorption, composite, chitosan, lignin, kinetics

 

Abstrak

Komposit kitosan-lignin disediakan, dicirikan, dan digunakan sebagai penjerap yang berkesan untuk pengambilan semula ion La(III) nadir bumi. Kajian pencirian menunjukkan bahawa komposit kitosan-lignin terdiri daripada kumpulan yang sedikit berasid kerana kedua-dua pH_zpc dan pH buburan masing-masing adalah 6.17 dan 5.47. Luas permukaan komposit yang spesifik didapati 1.41 m² g^-1 menggunakan Brunauer Emmett Teller (BET), iaitu lebih rendah daripada luas permukaan kitosan mentah. Spektrum FTIR menunjukkan hilangnya puncak kitosan amina primer pada 1648 cm^-1 kerana interaksi dengan cincin benzena di lignin. Faktor-faktor yang mempengaruhi tingkah laku penjerapan La(III) termasuk pH larutan, dos penjerap, kepekatan, dan masa sentuhan. Penjerapan maksimum La(III) berlaku pada pH 4 dengan dos penjerap 0.5 g L^-1. Model isoterma Langmuir sesuai dengan data isoterma eksperimen dengan pekali regresi R² = 0.99. Kapasiti penjerapan maksimum komposit kitosan-lignin ialah 500 mg g^-1 pada 300 K. Eksperimen persaingan ion mendedahkan Ce(III), iaitu ahli kumpulan lantanida lain, dijerap lebih banyak berbanding La(III) ketika kedua-dua ion logam tersebut bercampur dalam sistem binari. Nyahjerapan maksimum La(III) mencatatkan 90% dengan Na₂EDTA sebagai agen penyahjerapan.

 

Kata kunci:  penjerapan, komposit, kitosan, lignin, kinetik

 

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