Uptake of Pb(II) Ions from Simulated Aqueous Solution via Nanochitosan

Abstract

In this work, nanochitosan (NC) was prepared through ionic gelation using low molecular weight chitosan and maleic acid (MA). The synthesized NC was characterized by atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). During preparation, the particle size of the material depended on parameters such as concentration of chitosan and pH of the aqueous solution. After controlling the mentioned parameters, NC smaller than 100 nm was prepared. The chitosan and prepared NC were employed for the adsorption of Pb(II) from an aqueous solution in the form of a batch system. Among the sorption parameters, pH showed the strongest effect on the sorption process and removal of the maximum number of Pb(II) ions was obtained at pH value of 6. Pseudo-first-order and pseudo-second-order models were used to track the kinetics of the adsorption process. Langmuir and Freundlich’s isotherms were subjected to the absorption data to evaluate absorption capacity. NC proved to be an excellent adsorbent with a remarkable capacity to eliminate Pb(II) ions from aqueous solutions at multiple concentrations. The NC also showed better performance with a comparatively easier preparation process than in other reported work.

Adsorption Studies of Volatile Organic Compound (Naphthalene) from Aqueous Effluents: Chemical Activation Process Using Weak Lewis Acid, Equilibrium Kinetics and Isotherm Modelling

“…The surface properties, as well as affinity, of the adsorbent materials towards the adsorbate can be predicted by analyzing the equilibrium data using different isotherm models, mainly Langmuir, Freundlich and Temkin isotherm models [ 35 , 36 ].…”

“…In this work, the Langmuir isotherm showed better R 2 values than the other two models. This suggests that the adsorption of C 10 H 8 onto DSP and CDP was a monolayer, and the homogenous interaction dominated the adsorption process [ 10 , 35 , 36 , 37 ]. The magnitude of n obtained for the Freundlich model was greater than 1, reflecting the strong affinity between C 10 H 8 with DSP and CDSP samples both ( Table 1 ).…”

Evaluation of the role of chitosan and chitosan nanoparticles on reducing or removing heavy metals in the Nile tilapia, Oreochromis niloticus

“…Thus, it is more efficient to supplement fishmeal-based diet with CSNP that has higher effective chelation capacity for heavy metal compared to CS. Small size, large surface and high stability may be the reasons for CSNP high ability of chelation (Seyedmohammadi et al, 2016;Zareie et al, 2019). The higher density of adsorption sites of CSNP increases the probability of coordinate bond formation between the CSNP functional group and heavy metals compared to CS (Yu et al, 2013).…”