Adsorption Studies On The Removal Of Pb(II), Cd(II) Ani) Cr(VI) Ions From Aqueous Solutions Using Elephant Grass (Pennisetum Purpureurn)
ABSTRACT
The removal of Pb(II), Cd(II) and Cr(VI) ions from aqueous solutions using elephant grass
was studied using batch adsorption process. Reaction conditions such as the effect of particle
size, adsorbent dosage, pH, contact time, initial metal ion concentration and temperature were
evaluated. The results obtained indicated that the amount of metal ions adsorbed decreased
with increase in particle size of the adsorbent. The amount of metal ions adsorbed was also
found to increase with increase in dosage of adsorbent and the trend of adsorption follows the
order: Pb(II) > Cr(VI) > Cd(II). The adsorption process was found to be pH dependent and
the results obtained indicate that the optimum pH for the sorption of Pb(II), Cd(II) and Cr(VI)
were 7.0, 6.0 and 6.0 respectively. The rate of adsorption was also found to increase with
increase in the contact time. Application of pseudo first-order and pseudo second-order
models as well as intraparticle diffusion model to the adsorption data indicated that the
adsorption data followed pseudo-second order kinetics. Adsorption characteristics of the
adsorbent were investigated by fitting data into different equilibrium adsorption models viz:
Langmuir, Freundlich, Flory-Huggins and Dubinin-Radushkevich isotherms. and the result
showed that Dubinin-Radushkevich adsorption isotherm best describe the adsorption data.
Hence, the mechanism of physical adsorption was proposed. Also thermodynamic
considerations indicated that the adsorption is endothermic, spontaneous and progressed with
increasing degree of orderliness.
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OGBUNDIOGU, C (2021). Adsorption Studies On The Removal Of Pb(II), Cd(II) Ani) Cr(VI) Ions From Aqueous Solutions Using Elephant Grass (Pennisetum Purpureurn). Repository.mouau.edu.ng: Retrieved May 11, 2024, from https://repository.mouau.edu.ng/work/view/adsorption-studies-on-the-removal-of-pbii-cdii-ani-crvi-ions-from-aqueous-solutions-using-elephant-grass-pennisetum-purpureurn-7-2
CHIMAMKPAM, OGBUNDIOGU. "Adsorption Studies On The Removal Of Pb(II), Cd(II) Ani) Cr(VI) Ions From Aqueous Solutions Using Elephant Grass (Pennisetum Purpureurn)" Repository.mouau.edu.ng. Repository.mouau.edu.ng, 09 Jun. 2021, https://repository.mouau.edu.ng/work/view/adsorption-studies-on-the-removal-of-pbii-cdii-ani-crvi-ions-from-aqueous-solutions-using-elephant-grass-pennisetum-purpureurn-7-2. Accessed 11 May. 2024.
CHIMAMKPAM, OGBUNDIOGU. "Adsorption Studies On The Removal Of Pb(II), Cd(II) Ani) Cr(VI) Ions From Aqueous Solutions Using Elephant Grass (Pennisetum Purpureurn)". Repository.mouau.edu.ng, Repository.mouau.edu.ng, 09 Jun. 2021. Web. 11 May. 2024. < https://repository.mouau.edu.ng/work/view/adsorption-studies-on-the-removal-of-pbii-cdii-ani-crvi-ions-from-aqueous-solutions-using-elephant-grass-pennisetum-purpureurn-7-2 >.
CHIMAMKPAM, OGBUNDIOGU. "Adsorption Studies On The Removal Of Pb(II), Cd(II) Ani) Cr(VI) Ions From Aqueous Solutions Using Elephant Grass (Pennisetum Purpureurn)" Repository.mouau.edu.ng (2021). Accessed 11 May. 2024. https://repository.mouau.edu.ng/work/view/adsorption-studies-on-the-removal-of-pbii-cdii-ani-crvi-ions-from-aqueous-solutions-using-elephant-grass-pennisetum-purpureurn-7-2