Synthesis And Characterization And Adsorptive Property Research On Arsenic Of Hydrated Ferrous Oxide-loaded Resin

Ferrous oxide loaded polymeric composite (Ferrous Oxide-Loaded Polystyrene Diethanolamine Resin, designated as PDR-HFO) was developed on the basis of researches of hydrated ferrous oxide (HFO) loadness for enhanced removal of arsenic species from waters and security control of water quality. Arsenic removal by the composite was examined in batch and column adsorption tests, and the underlying mechanisms were initially revealed. The main conclusions available were as follows:Synthesis process of a new composite adsorpent of hydrated ferrous oxide loaded polystyrene resin through reaction of 201×7 resin and diethanolamine was successfully developed. 201×7 resin was chosen as the resin matrix for its better sorption capacity than D301 resin after their synthesis as composite. Within certain time, quantity of hydrated ferrous oxide increased with concentration of FeCl3 in composite and maxcimum proportion was 2.4% in mass. quantity of hydrated ferrous oxide kept stable after 8 hours'reactive time. Sorption process on arsenic of composite can be operated at normal temperature because of little effection on its'sorption capacity by time.Researches of sorption and desorption-regeneration of arsenic, the optimum pH is from 5 to 9. Sorption capacity of composite would decline when pH was too low or too high. At normal temperature, sorption isothermy fitted Freundlich equation, presented as qe = 0.238Ce0.575, and correlation coefficient was 0.998; composite reached sorption equilibrium within 60 minute and its sorption kinetic fitted pseudosecond-order model with sorption kinetic equation and correlation coefficient were t/qt = 0.9922 + 0.2675 t and 0.994 respectively. In column experiment, it exhibited low sorption capacity under high velocity with arsenic concentration of 12.85 mg/L in influent; arsenic concentration of effluent exceeded 0.01 mg/L and reached sorption equilibrium when effluent volume amounted 195 BV (BV, bed volume.1 BV=27 ml)and 415 BV respectively. It exhibited good sorption property with arsenic concentration of 0.502 mg/L in influent under velocity of 10 BV/h,15 BV/h; arsenic concentration in effluent increased gradually and exceeded 0.01 mg/L after 450 BV. The working layer moved downward smoothly. Desorption can be conducted by 10%(v/v) HCl and after regeneration rate can reach over 96% with regeration velocity of 7 BV/h exausting 300 ml, arsenic concentration of desorption solution reached 326.78 mg/L and 78.69 mg/L by two kinds of arsenic concentrarion in influent and accumulation concetration were 25.43 and 156.75 times moer than that of influent.