Lead removal onto cross-linked low molecular weight chitosan pyruvic acid derivatives

Removal of cadmium from aqueous solution using low molecular weight chitosan derivative

“…1401 Da) was prepared in accordance with the literature described previously (Boamah et al, 2014;Zhang, 2009), pyruvic acid (PA), glutaraldehyde (GLA) and all other chemicals and reagents were of analytical grade. Distilled water was used to prepare solutions.…”

“…The adsorption capacity (2.27 mg/g) of cross-linked low molecular weight chitosan pyruvic acid derivative was probably due to both secondary amine and carboxyl groups which were evident in the FTIR analysis. Also, the molecular weight of the chitosan in the present study contributed to the adsorption capacity value because small intermolecular distance enhances intermolecular interactions (Boamah et al, 2014;Zhou, Yang, Guo, & Chen, 2003).…”

“…In our previous work (Boamah et al, 2014), chitosan was degraded into two kinds of low molecular weight chitosan (CS 8 and CS 11 ), modified with pyruvic acid (PA) and then cross-linked with glutaraldehyde (GLA) to obtain CS 8 PA-GLA and CS 11 PA-GLA. The adsorbents were characterized with FTIR.…”

Combination of carboxymethyl chitosan-coated magnetic nanoparticles and chitosan-citrate complex gel beads as a novel magnetic adsorbent

“…However, a disadvantage of this adsorbent is its weak acid resistance properties. Cross-linking methods are commonly employed to reduce the solubility of chitosan in acids (Mi, Kuan, Shyu, Lee, & Chang, 2000;Mi, Shyu, & Peng, 2005), thereby extending the applicability of this adsorbent (Boamah et al, 2014;Laus, Costa, Szpoganicz, & Favere, 2010;Osifo et al, 2008). However, the traditionally-used cross-linking agent, glutaraldehyde, is extremely toxic and can easily cause substantial environmental damage (Ballantyne, Myers, & Blaszcak, 1997).…”

Biosorptive Removal of Zinc from Aqueous Solution by Algerian <i>Calotropis procera</i> Roots

“…Also, the data in Table 1 indicated that the maximum adsorption capacity of CP roots for Zn(II) was calculated as 9.69 mg/g. It can be mentioned that the surface of CP roots is homogeneous and the adsorption of Zn(II) formed a monolayer on its outer surface [24]. Agouborde et al [25] also, found the adsorption of some heavy metals such as Zn(II) onto sawdust and Brine sediments followed Langmuir model and formed monolayer with monolayer capacity (q m ) of 2.58 mg/g and 4.85 mg/g respectively.…”