Adsorption Performance of Methylene Blue and Lissamine Green B. Dyes by Areca Catechu Nuts (Buah Pinang) Husk

Aina Sabrina Binti Sait, - (2022) Adsorption Performance of Methylene Blue and Lissamine Green B. Dyes by Areca Catechu Nuts (Buah Pinang) Husk. [Final Year Project Report] (Submitted)

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Abstract

Areca Catechu L., often known as betel nut, was applied as an alkali-treated adsorbent to reduce the adsorption of methylene blue (MB) and Lissamine green b. (LGB) dyes in aqueous solution. Moreover, using the final concentration data obtained from Ultraviolet-Visible (UV-Vis) spectrophotometer, the dye removal percentage of all parameters, including adsorbent dosage, initial dye concentration and temperature, was calculated. For MB dye, the optimal parameters were 1.0 g, 5 mg/L and 50 °C for adsorbent dosage, initial MB concentration and temperature, respectively. Whereas, for LGB dye, the optimal parameters were 1.0 g, 25 mg/L and 40 °C for adsorbent dosage, initial LGB concentration and temperature, respectively. The surface structure of the areca nut husk adsorbents was examined using a Scanning Electron Microscope with Energy Dispersive X-Ray (SEM-EDX). It was discovered that the areca nut husk surface before treated with NaOH was rough and uneven in terms of pores dimension, as opposed to the post treated surface. The presence of functional groups such as -C=O, -O-H, -C-O and -C-H were determined using Fourier Transform Infrared (FTIR) and KBr disc. Last but not least, isothermal studies on the adsorption performance of MB and LGB dyes by areca nut husk adsorbent, incorporating Langmuir and Freundlich models. The Freundlich model was found to suit the MB and LGB dye adsorption reactions with regression coefficients (R2 ) of 0.946 and 0.945, respectively. Therefore, the study revealed the NaOH-treated areca nut husk adsorbent can be used as a long-term adsorbent for the removal of MB and LGB dyes from contaminated wastewater.

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