Phosphorus Materials Research Articles

Integrating chloroethyl phosphate with biopolymer cellulose and assessing their potential for absorbing brilliant green dye

Cellulose is vastly used in the adsorption of dyes. It can be used in its natural formor with modified surface. This present study aimed at integrating phosphate cellulose with chloroethyl phosphate, value their potential as adsorbents of brilliant green dye, and compare suchresults to those of pure cellulose (Pure-Cel). The phosphatic material (Phosp-Cel) was characterized by XRD, where it was found that the crystallinity of the material was kept; by IV, which showedtwo bands in 1059 and 1027cm−1 that indicated the presence of the COP link; by 31P NMR, which showed a broad signal in 1.86ppm indicating the presence of a single species of phosphorus in material (POC); and by thermogravimetry, where Phosp-Cel proved to be more thermally stable than cellulose forerunner. A time of 20 and 120min was obtained to reach the equilibrium, through the tests of adsorption, for Pure-Cel and Phosp-Cel, respectively. In both cases the system follows the pseudo second order model. The largest removal occurred at pH 10 and the maximum adsorption was 46.7, 58.42 and 90.5mgg−1for Pure-Cel, and 113.6, 114.2 and 112.1mgg−1 for Phosp-Cel at 25°C, 35°C and 45°C, respectively. Pure-Cel experimental isotherms were best fit to the Langmuir model, and Phosp-Cel at 25°C best fit the Langmuir model; while at 35°C and 45°C it best fit the Freundlich model.