Abstract:
Dyes removal by adsorption using modified activated carbon is by far the most common
and effective method for wastewater contaminants removal. The aim of this study was to
remove MB dye from aqueous solution using modified mango seed kernels as adsorbent.
The lignocellulosic-based dried mango seed kernel modified with 50% H2SO4 and 40%
H3PO4 was followed by heating in an electrical furnace at 500ºC for 2 hr for enhancement
of MB adsorption from the aqueous solution. The surface characterization of raw MSK and
MKAC before and after adsorption was carried out by proximate analysis, FTIR, XRD and
SEM analysis. FTIR results showed different functional groups like aldehydes, ester, amide
group and carboxylic acid were observed at different wave numbers. The batch adsorption
studies were also carried out at optimum condition: adsorbent dose 0.2 g/L, initial MB
concentration 10 mg/L, contact time 60 min, pH 8 and shaking speed 150 rpm . It was
observed that the maximum adsorption efficiencies of the MKAC with 50% H2SO4 and
40% H3PO4 were found to be 91.5% and 89.3% at room temperature, respectively. UV-Vis
spectrophotometer technique was used for the measurement of concentration of dye before
and after adsorption of MB at maximum wave length (λmax) of 665 nm.. The linear form
of Langmuir and Freundlich models were applied to represent adsorption isotherm. The
calculated equilibrium data of MB fitted Langmuir isotherm models with maximum
adsorption capacity (qmax) for 50% H2SO4 and 40% H3PO4 were 10 mg/g and 5.8 mg/g
respectively. Pseudo second-order kinetic model was found to be well fitted to the data
obtained from R2
value
