Statical Process Optimization on Adsorption of Phenol from Water Using Activated Carbon Prepared from False Banana (Enseteventricosum) Leaf
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Date
2023-10
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Addis Ababa University
Abstract
The reason for this current study was to examine the potential of an adsorbent produced from EL
to recover phenol from wastewater. Using agricultural wastes as valuable resources to create
ACs from biomass wastes is one of the greenest resolutions. The main objective of this study was
to use a chemical activation technique to produce ACs from readily available waste EL. An
essential property for the synthesis of AC is the EL's cellulose concentration (18.4%), lignin level
(10.3%), MC of 8.35%, VM of 71.09%, AC of 3.28%, FCC of 17.28%, and yield of 49.30% at
400°C. With a nitrogen flow rate of 150ml/min, the process of carbonization was conducted for
30, 60, and 90minutes at 400, 500, and 600°C. The char product was treated with 37%
phosphoric acid (H3PO4) at diverse impregnation ratios (0.5, 1 and 1.5). It was found that
500°C, a 60-minute contact period, and an impregnation ratio of 1 in AC5 were ideal for the
production of AC. With respect to surface area (1023m2/g), iodine number (984mg/g), and total
pore volume (0.45cm3/g), AC5 was the largest. Scanning electron microscopy (SEM) analysis
showed that the samples' uneven surface structure. Several functional groups that aid in
adsorption was found when Fourier Transform Infrared Spectroscopy (FTIR) was examined.
Using phenol as a separate adsorbate and the ideal conditions (PH=6, adsorbent dosage=0.4g,
initial concentration=10mg/l, and contact time=120min) at room temperature, the adsorption
capacity of generated activated carbon (AC5) was investigated. It was demonstrated that as
initial concentration increased, the capacity of adsorption increased. The maximal phenol
elimination capability of the AC5 adsorbent is 95%. With the aid of the model, a relationship
between the three experimental variables and the percentage of elimination was constructed. It
looked into the phenol adsorption equilibrium isotherms utilizing the Freundlich, Temkin, and
Langmuir isotherm models. For the concentration range of 10-150 mg/L, the monolayer
adsorption capacity was 5.80mg/g, according to equilibrium data that followed the Langmuir
model. There were kinetic analyses done. It was discovered that the data fit a pseudo-second
order model. The best phenol elimination was obtained with an initial phenol PH of 6 and
contact duration of 80 minutes. The study concluded that phenol could be effectively removed
from aqueous solutions using activated carbon obtained from discarded Enset leaves.
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Keywords
activated carbon, Enset leaf, phenol, surface area, adsorption, and chemical activation.