Adsorption, kinetics and thermodynamic studies of Lead (II) ions from aqueous solutions onto bio-adsorbent prepared from locust bean seed shell
30 Jun 2019-Vol. 4, Iss: 3, pp 43-53
TL;DR: In this paper, locust bean seed shell powder prepared from locust been seed shell (LBSS) was used as an adsorbent for the removal of heavy metals from waste water.
Abstract: Adsorption has been widely used for the removal of heavy metals from waste water due to its availability, efficiency, profitability and its low cost of operation. In this study, locust bean seed shell powder prepared from locust been seed shell (LBSS) was used as adsorbent. Batch adsorption experiments were carried out in order to study the effect of process variables such as; adsorbent dosage, time, concentration, and temperature. The adsorbents both unmodified and modified were characterized using SEM, XRF, and FTIR. The results showed structural modification of the modified locust bean seed shell powder (MLBSSP). The adsorption equilibrium data of MLBSSP perfectly conform to Freundlich adsorption model based on its high correlation coefficient which is close to unity (0.9738). However, the kinetic studies showed that the process fit in well into pseudo second order due to its higher R2 (0.9662) in MLBSSP. The positive values obtained for change in enthalpy indicate that the adsorption process is endothermic in nature while the negative values obtained for change in entropy of the process reveal decrease in the randomness of the process and the positive values of change in Gibb’s free energy suggest non spontaneity of the adsorption process. The adsorbent (MLBSSP) shows excellent performance in removing Pb (II) ions from aqueous solutions and can be used as a substitute to the available expensive adsorbents since it is cheap, non-toxic and abundantly available.
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TL;DR: In this article, the results of the best-fit model of the Langmuir and Freundlich models of adsorption were calculated and the results are discussed and the dimensionless factor, R L revealed the favorable nature of the isotherm of the dye-activated carbon system.
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Additional excerpts
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TL;DR: In this article, the effect of temperature on the removal of Pb 2+ and Cd 2+ in aqueous effluent using C. bicolor biomass in a batch sorption process was investigated.
379 citations
30 May 2007
TL;DR: In this article, the removal of poisonous Pb (II) from wastewater by different low-cost and abundant adsorbents was investigated and the adsorption efficiencies were found to be pHdependent, increasing by increasing the solution pH in the range from pH 2.5 to 6.5.
Abstract: The removal of poisonous Pb (II) from wastewater by different low-cost
abundant adsorbents was investigated. Rice husks, maize cobs and
sawdust, were used at different adsorbent/metal ion ratios. The
influence of pH, contact time, metal concentration, adsorbent
concentration on the selectivity and sensitivity of the removal process
was investigated. The adsorption efficiencies were found to be pH
dependent, increasing by increasing the solution pH in the range from
2.5 to 6.5. The equilibrium time was attained after 120 min and the
maximum removal percentage was achieved at an adsorbent loading weight
of 1.5 gm. The equilibrium adsorption capacity of adsorbents used for
lead were measured and extrapolated using linear Freundlich, Langmuir
and Temkin isotherms and the experimental data were found to fit the
Temkin isotherm model.
282 citations
"Adsorption, kinetics and thermodyna..." refers result in this paper
...This is similar to studies reported by Abdel-Ghani et al. (2007), Teker et al. (1999) and Mittal (2006)....
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TL;DR: In this article, the removal of poisonous Pb (II) from wastewater by different low-cost abundant adsorbents was investigated and the adsorption efficiencies were found to be pH dependent, increasing by increasing the solution pH.
Abstract: The removal of poisonous Pb (II) from wastewater by different low-cost abundant adsorbents was investigated. Rice husks, maize cobs and sawdust, were used at different adsorbent/metal ion ratios. The influence of pH, contact time, metal concentration, adsorbent concentration on the selectivity and sensitivity of the removal process was investigated. The adsorption efficiencies were found to be pH dependent, increasing by increasing the solution pH in the range from 2.5 to 6.5. The equilibrium time was attained after 120 min and the maximum removal percentage was achieved at an adsorbent loading weight of 1.5 gm. The equilibrium adsorption capacity of adsorbents used for lead were measured and extrapolated using linear Freundlich, Langmuir and Temkin isotherms and the experimental data were found to fit the Temkin isotherm model.
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...Also, other bio-adsorbents that have been investigated include pillared clay (Vinod and Anirudhan, 2001), cassava waste (Abia et al., 2003), caladium bi colour (Horsfall and Spiff, 2004, Horsfall and Spiff, 2005), maize cob and husk (Igwe and Abia 2003)....
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