[Adsorption kinetics of phosphate from aqueous solutions onto modified corn residue].
The adsorption kinetics of phosphate from aqueous solutions onto modified corn residue was studied in a hatch reactor. The influence of initial pH, concentration and temperature to adsorption effect were investigated. In addition, the kinetic data were fitted by pseudo-first-order equation, pseudo-second-order equation, modified pseudo-first-order equation and intra-particle diffusion model, and the respective characteristic rate constants were presented. The results showed that the adsorption data fitted Freundlich isotherm model, and the maximum adsorption capacity of phosphate would decrease with the temperature increasing. Furthermore, the adsorption process could reached equilibrium in 30 minutes, and the pseudo-second-order equation and intra-particle diffusion model generated the best agreement with the experimental data for the adsorption systems. The intra-particle diffusion was the main rate-controlling step. With increasing initial concentration, the rate constant of pseudo-second-order equation decreases and that of intra-particle diffusion model increases. The adsorption kinetic analyses could be of a great practical value for the technological applications of phosphate removal from aqueous solutions.
Wang
Yu
Y
School of Environmental Science and Engineering, Shandong University, Ji' nan 250100, China. wy@sdein.gov.cn
Gao
Bao-Yu
BY
Yue
Wen-Wen
WW
Xu
Xiu-Ming
XM
Xu
Xing
X
Pan
Shu-Ying
SY
D000327:Adsorption; D001673:Biodegradation, Environmental; D007700:Kinetics; D010710:Phosphates / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D018547:Plant Stems / Q000737:chemistry / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D003313:Zea mays / Q000737:chemistry / Q000378:metabolism*
D010710:Phosphates; D014874:Water Pollutants, Chemical