Removal of Cd(ӀӀ) and phenol using novel cross-linked magnetic EDTA/chitosan/TiO2 nanocomposite

Bahareh Alizadeh; Mohammad Delnavaz; Alireza Shakeri

doi:10.1016/j.carbpol.2017.11.095

Removal of Cd(ӀӀ) and phenol using novel cross-linked magnetic EDTA/chitosan/TiO₂ nanocomposite

Carbohydr Polym. 2018 Feb 1:181:675-683. doi: 10.1016/j.carbpol.2017.11.095. Epub 2017 Nov 27.

Authors

Bahareh Alizadeh¹, Mohammad Delnavaz², Alireza Shakeri³

Affiliations

¹ Faculty of Engineering, Civil Engineering Department, Kharazmi University, Tehran, Iran.
² Faculty of Engineering, Civil Engineering Department, Kharazmi University, Tehran, Iran. Electronic address: delnavaz@khu.ac.ir.
³ Faculty of Chemistry, Tehran University, Tehran, Iran.

PMID: 29254022
DOI: 10.1016/j.carbpol.2017.11.095

Abstract

In the present study, a novel cross-linked magnetic EDTA/chitosan/TiO₂ (MECT) was prepared as eco-friendly and efficient bioadsorbent for the removal of Cd(II) ions and phenol from aqueous solution. Magnetic chitosan was improved by surface functionalization and cross-linking of it with EDTA and photocatalytic with TiO₂. The nanocomposite was characterized by FE-SEM, EDX, FTIR and XRD techniques and Cd(II) ions adsorption and phenol degradation under varied experimental conditions were investigated. Results revealed that MECT nanoparticle with an average diameter of 40nm had the best performance in adsorption of Cd(II) and degradation of phenol at optimum pH values of 5-6. Moreover, the adsorption kinetics proceeded according to the mechanism of the pseudo-second-order model. The maximum adsorption capacity of Cd(II) obtained from Langmuir model was 209.205mgg^-1 and phenol degradation efficiency was up to 90%. Reusability of MECT was tested and the adsorption and degradation capacities were not affected after five cycles. The paper suggests that the MECT is a promising recyclable nanocomposite for the removal of hazardous pollutants from contaminated water.

Keywords: Cd(ӀI); Magnetic chitosan; Phenol; TiO(2); Wastewater.