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Vol. 12, No 3 (2020) Trang: 54-65
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Article info.



Received 11 Aug 2020
Revised 08 Oct 2020

Accepted 30 Nov 2020


In this study, coconut coir pith (cellulose-lignin compound) was first treated with water and sodium hydroxide solution to remove lignin and impurities, then lignin-extracted coir pith was calcined at 200°C for 6 h. The obtained adsorbent was applied to remove Cr(IV) ions by using adsorption method. Some analytical methods such as thermal gravimetric analysis (TGA), Fourier Transform Infrared Spectroscopy (FT-IR), Brunauer–Emmett–Teller analysis (BET), X-ray powder diffraction analysis (XRD), pHpzc analysis, Boehm titration, and potentiometric titration were employed to characterize structure, specific surface area, functional groups, and surface charge of the adsorbent. Adsorption results showed that 95.23% of Cr(IV) was removed from solution of 100 mg.L-1 by using a certain amount of adsorbent at pH 2.0 within 20 min at room temperature. Kinetics of Cr(VI) adsorption from aqueous solution on adsorbent fit to Pseudo-second-order kinetic equation and adsorption isotherm of Cr(IV) followed to the Freundlich model.


Adsorbent, adsorption, Cr(VI) ion, coir pith

Cited as: Thanh, L.H.V., Lan, T.N.P., Quyen, T.T.B., Nam, H.Q. and Hanh, C.L.N., 2020. Adsorption of chromium (VI) ion using adsorbent derived from lignin extracted coir pith. Can Tho University Journal of Science. 12(3): 54-65.

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