Adsorption of Methylene Blue onto Acid Modified Raphia Taedigera Seed Activated Carbon
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Date
2020-04-19
Journal Title
Journal ISSN
Volume Title
Publisher
Advanced Journal of Chemistry
Abstract
In this work, the possibility of using Raphia taedigera seed as a low-cost
adsorbent to remove methylene blue (MB) dye from aqueous solutions
was investigated. The activated carbon was prepared by carbonization
and chemical treatment of the seed with sulphuric acid to produce acidmodified Raphia taedigera seed activated carbon (RTAC). The surface
morphology and bond arrangement of the RTAC were evaluated using
the scanning electron microscopy (SEM) and Fourier transforms
infrared spectroscopy (FTIR), respectively. The SEM analysis results
revealed that the prepared adsorbent had aggregated and rough surface
structure with pores and FTIR revealed the presence of several
functional groups such as –C=O, –OH, –C=C–, –N=O and –C=N–. The
adsorption efficiency of the RTAC for the removal of the MB dye was
assessed under different experimental conditions including, contact
time, temperature, pH, adsorbent dosage, and dye initial concentration.
The results gave the performances of 99.611% after 15 min, 99.635% at
303 K, 99.894% at pH 9, 99.256% with 0.9 g, and 99.743% for 40 mg/L
for evaluating the effect of the contact time, temperature, pH, adsorbent
dosage, and dye solutions initial concentration, respectively. The
adsorption of the MB dye onto the RTAC conformed to Langmuir
isotherm and fit best to pseudo-second-order kinetic models.
Thermodynamic studies indicated a spontaneous, endothermic, feasible,
and physisorption nature of the RTAC and MB dye interactions. The
present study found the acid-modified Raphia taedigera seed activated
carbon to be a promising low-cost adsorbent for the removal of MB dye
from aqueous solution.
Description
Staff Publication
Keywords
Raphia taedigera, Methylene blue, Adsorption isotherm, Kinetics
Citation
Olasehinde, E., Abegunde, S. (2020). Adsorption of Methylene Blue onto Acid Modified Raphia Taedigera Seed Activated Carbon. Advanced Journal of Chemistry-Section A, 3(5), 663-679. doi: 10.22034/ajca.2020.106326