Dyes from several industry effluents are major
concern of environmental pollution. In this study, the
efficiency of a cost-effective natural adsorbent
Strychnos potatorum
Linn (Fam: Loganiaceae) seeds on removing
reactive orange-M2R dye from aqueous solution was
investigated using batch adsorption isotherms at 30 ± 1 ºC
and 120 rpm. The efficacy of the adsorbent system was
also studied at various parameters viz. contact time, pH,
adsorbent dosage and initial dye concentration. Maximum
adsorption (
qe = 9 mg/g) was observed at pH 2.0, equilibrium
time 6 h, initial dye concentration of 100 mg/L and
adsorbent dosage of 0.2 g/100 mL. The unit adsorption of
dye,
qe (mg/g) increased with increase in contact time and
initial dye concentration, while it decreased with increase
in adsorbent dosage. The adsorption kinetic studies
revealed that it follows pseudo-second-order reaction
model. Equilibrium adsorption data followed both Langmuir
and Freundlich isotherms with good agreement. These
investigations suggest that
Strychnos potatorum Linn seeds
(SPS) could be used as a low-cost adsorbent in treating
textile effluents for dye removal applications. The adsorbent
(SPS) was also characterized using Fourier transform
infrared spectroscopy, powder X-ray diffraction, and
scanning electron microscopic technique.
