| 沙漠与沙漠化 |
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| Adsorption Kinetics of Phosphate on Desert Particles |
| LI Bei-gang, BAI Xiao-ling, MA Qin |
| College of Chemistry and Environmental Science, Inner Mongolia Normal University, Hohhot 010022, China |
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Abstract The adsorption kinetics and influencing factors, and adsorption-desorption equilibrium mass concentration (EPC0) of phosphate(P) on desert particles taken from the Ulan Buh Desert and the Kubuqi Desert were investigated, respectively. Results showed that: (1) adsorption of P on different desert particles was different, but the adsorption rates were faster within the 0—8th hour time, then gradually get slow at 8—48th hour time and basically tended to a dynamic equilibrium at the 48th hour; Both initial P concentration and desert particle concentration had some impact on P adsorption; (2) The adsorption of P on different desert particles followed the pseudo-secend order adsorption kinetic model and the Weber-Morris diffusion equation, and the adsorption process was mainly controlled by the P diffusion process in particles; and (3) Adsorption-desorption balance point of P on desert particles in the Yellow River were different and their EPC0 were in the range of 0.010 to 0.042 mg·L-1, which were higher than the P concentration in the Yellow River. The study indicates that there is release of P for desert particles to the Yellow River.
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Received: 03 June 2010
Published: 20 November 2011
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2011, Vol. 31 
