Affordable Access

Publisher Website

Removal of cadmium(II) from aqueous solutions by chemically modified maize straw

Authors
Journal
Carbohydrate Polymers
0144-8617
Publisher
Elsevier
Identifiers
DOI: 10.1016/j.carbpol.2014.08.041
Keywords
  • Maize Straw
  • Succinylation
  • Adsorption
  • Cadmium

Abstract

Abstract A new regenerable adsorbent was successfully prepared by modifying maize straw (MS) with succinic anhydride in xylene. The succinylated-maize straw (S-MS) was characterized by FTIR, solid-state MAS 13C NMR spectroscopy, SEM-EDX and point of zero charge analysis. NaS-MS was successfully obtained after deprotonating the carboxylic acid groups of S-MS by Na2CO3 solution. Batch experiments were carried out with NaS-MS for the removal of Cd(II). The effects of pH, adsorbent dosage, contact time, initial concentration and temperature were investigated. The experimental data were best described by a pseudo-second-order kinetics and Langmuir adsorption models. Thermodynamic parameters (ΔG, ΔH, and ΔS) were also calculated from data obtained from experiments performed to study the effect of temperatures. NaS-MS could be regenerated at least five times in saturated NaCl solution without any loss. Furthermore, ∼97% of adsorbed Cd(II) ions could be recovered as the metal oxide. Finally, the adsorption mechanism of NaS-MS was discussed.

There are no comments yet on this publication. Be the first to share your thoughts.