Biosorption of Pb(II) from Aqueous Solution Using Cow Hooves: Kinetics and Thermodynamics

Abstract

Biosorption of Pb(II) ions from aqueous solution by cow hooves (CHs) was investigated as a function of initial pH, contact time, and biosorbent dosage through batch studies. Equilibrium experiments were performed at three different temperatures (298, 308, and 318 K) using initial Pb 2+ concentration ranging from 15 to 100 mgg −1 . This study revealed that maximum uptake (96.2% removal) of Pb 2+ took place within 30 minutes of agitation, and the process was brought to equilibrium within 60 minutes of equilibration. The equilibrium data were modelled using Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models. The Langmuir isotherm model fitted the data best at all temperatures considered. The Lagergren second-order kinetic model fitted the biosorption process better than the first-order model. The negative values obtained for both Gibb's free energy change and enthalpy change are an indication of the spontaneous and exothermic nature of the sorption of Pb 2+ onto CH. A study of the FTIR spectral obtained before and after Pb 2+ sorption showed that carbonyl, hydroxyl, amino, and carboxyl groups were involved in the sorption process.

Isotherm Studies of Adsorption of Cr (Vi) Ions onto Coconut Husk

“…Therefore, an equilibrium time of 90 minutes was used for further experiments. The initial high biosorption rate may be linked to the abundance of free binding sites on the biosorbent which become saturated resulting in decreased biosorption rate [14].…”

“…The low price of the Biosorbent is an additional assets, this renders the whole method cheap and allows for combining with other sequestering processes [13]. Recent studies have shown that several Biosorbents like cow hooves [14], egg shell [15], Msasa Tree (brachystegia spiciformis) Leaf Powder [1], chick and Duck Feather [16], pseudomonas aeruginosa DSGPM4 species [17], treculia africana [18], roasted date pits [19], shrimp peel [20], were used for remediation of heavy metals from wastewater.…”

Equilibrium, Kinetics, and Thermodynamics of the Removal of Nickel(II) from Aqueous Solution Using Cow Hooves

“…Heavy metal pollution is a global menace that has threatened the existence of lives for decades. Heavy metals are particularly injurious to plants and animals because of their nonbiodegradability, persistency, and bioaccumulation tendency [1,2]. Nickel can be introduced to the aquatic environment through raw wastewater streams from industrial activities such as mineral processing, paint formulation, electroplating, porcelain enameling, copper sulphate manufacture, manufacture of alloys, silver refining, zinc base casting and storage battery industries, and mining [3][4][5].…”

Estudo da remoção de Sr²⁺ de soluções aquosas utilizando fibras de coco bruta e ativada com peróxido de hidrogênio em meio básico

“…Em um processo de adsorção de íons metálicos o ΔG < 0 indica que o processo de adsorção é espontâneo. Essas reações ditas espontâneas ocorrem em um processo exotérmico, na qual há liberação de energia (OSASONA et al, 2013;NUHOGLU E MALKOC, 2009). Por outro lado, em sistemas não espontâneos, ΔG > 0, ocorre a absorção de energia, ou seja, é necessário um fornecimento de energia ao sistema para ocorrer a reação química de maneira a vencer a energia de ativação para a formação de produtos.…”