Application of magnetic chitosan nanocomposites modified by graphene oxide and polyethyleneimine for removal of toxic heavy metals and dyes from water

A new type of magnetic chitosan nanocomposites modified with graphene oxide and polyethyleneimine (MCS/ GO-PEI) was synthesized, which was used as an adsorbent to remove the toxic heavy metals of As and Hg as well as anionic azo dyes of congo red and amaranth in environmental water. In this experiment, MCS/GO-PEI was first synthesized and the structure and morphology characterized by scanning electron microscopy (SEM), trans-mission electron microscopy (TEM), Fourier-transform infrared spectrometry (FT-IR), X-ray diffractometer (XRD), vibrating sample magnetometry (VSM) and X-ray photoelectron spectroscopy (XPS). The adsorption performance of the material for four analytes was investigated through adsorption experiments. The kinetic and isothermal results showed that the adsorption process was well described by pseudo-second-order kinetic and Langmuir isotherm model. Besides, the important parameter pH in the adsorption process was investigated and optimized. The maximum adsorption capacities of the nanocomposites for arsenic, mercury ions, congo red, amaranth were 220.26, 124.84, 162.07, 93.81 mg g(-1) under optimum adsorption conditions, respectively. The adsorption-desorption showed that the adsorbents were presented adequate reusability. The as-prepared MCS/ GO-PEI nanocomposite could serve as promising adsorbent for arsenic, mercury, congo red and amaranth in environmental water samples treatment technology.

Automated summary

A new type of magnetic chitosan nanocomposites modified with graphene oxide and polyethyleneimine (MCS/ GO-PEI) was synthesized and used as an effective adsorbent for removing toxic heavy metals and anionic azo dyes in environmental water. The adsorption experiments showed that the material had strong adsorption performance for the four analytes, with the adsorption process following pseudo-second-order kinetic and Langmuir isotherm model. pH was investigated and optimized as an important parameter in the adsorption process. The prepared MCS/ GO-PEI nanocomposite demonstrated promising reusability as an adsorbent for arsenic, mercury, congo red, and amaranth in environmental water samples.