Chitin hydrogel reinforced with TiO2 nanoparticles as an Arsenic sorbent

M. L. PERALTA RAMOS; J. A. GONZÁLEZ; S. ALBORNOZ; C. J. PÉREZ; M. E. VILLANUEVA; S. A. GIORGIERI; G. J. COPELLO

CHEMICAL ENGINEERING JOURNAL

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2016 vol. 285 p. 581 - 587

1385-8947

p { margin-bottom: 0.21cm; direction: ltr; color: rgb(0, 0, 0); line-height: 115%; widows: 2; orphans: 2; }p.western { font-family: "Calibri",sans-serif; font-size: 11pt; }p.cjk { font-family: "SimSun","宋体"; font-size: 11pt; }p.ctl { font-family: "Cordia New",sans-serif; font-size: 14pt; }a:link { color: rgb(0, 0, 255); }Inthis work chitinhydrogels werereinforced with TiO2nanoparticlesactingasfillers.Themechanicaland physicochemical characteristics of these hydrogelswere studiedby oscillatoryrheology, Infrared spectroscopy (FTIR),ScanningElectronMicroscopy(SEM)andSmallAngleX-ray Spectroscopy(SAXS).Adsorption showedto be higher at pHs below the TiO2point of zero charge (pH≈6.9).Theequilibrium was achieved within 4 h following an Elovich kineticmodel. The equilibrium assay showed a maximumcapacity of3.1 mg/g with better fitting for theLangmuirmodel. Moreover,thehomogeneity/heterogeneityparameters of the Sips, Toth and Redlich-Peterson models werecloseto a value of 1, indicatinga homogeneous sorbent/sorbate interaction. Typicalnatural water ions competedwith As(V) for the sorption sites, beingsulphate the most relevant interference.This interference was also evidenced in As(V) adsorption from naturalwater samples where the sorption capacity varied depending the anioncomposition of the sample. Thereutilization of the hybrid gel was assessed up tofive adsorptioncycles.p { margin-bottom: 0.21cm; direction: ltr; color: rgb(0, 0, 0); line-height: 115%; widows: 2; orphans: 2; }p.western { font-family: "Calibri",sans-serif; font-size: 11pt; }p.cjk { font-family: "SimSun","宋体"; font-size: 11pt; }p.ctl { font-family: "Cordia New",sans-serif; font-size: 14pt; }a:link { color: rgb(0, 0, 255); }