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中国沙漠 ›› 2011, Vol. 31 ›› Issue (6): 1388-1392.

• 沙漠与沙漠化 • 上一篇    下一篇

沙漠颗粒物对磷酸盐的吸附动力学研究

李北罡, 白晓玲, 马 钦   

  1. 内蒙古师范大学 化学与环境科学学院, 内蒙古 呼和浩特 010022
  • 收稿日期:2010-06-03 修回日期:2010-09-29 出版日期:2011-11-20 发布日期:2011-11-20

Adsorption Kinetics of Phosphate on Desert Particles

LI Bei-gang, BAI Xiao-ling, MA Qin   

  1. College of Chemistry and Environmental Science, Inner Mongolia Normal University, Hohhot 010022, China
  • Received:2010-06-03 Revised:2010-09-29 Online:2011-11-20 Published:2011-11-20

摘要: 研究了乌兰布和沙漠和库布齐沙漠颗粒物在黄河水体中对磷酸盐(P)的吸附动力学及其影响因素和吸附/解吸平衡质量浓度(EPC0值)。结果表明:①不同沙漠颗粒物对P的吸附能力各不相同,但吸附速率均在前 8 h内较快,以后逐渐趋缓,在48 h时基本达到吸附平衡。磷初始浓度和颗粒物浓度均对颗粒物吸附P有一定影响;②颗粒物对P的吸附过程均符合准二级吸附动力学模型及Weber-Morris扩散方程,吸附过程主要由P在颗粒物内的扩散过程控制;③入河沙漠颗粒物在黄河水体中对P的吸附过程存在一个吸附/解吸平衡点,该点对应的不同颗粒物对P的EPC0值为0.010~0.042 mg·L-1,且其值均大于相应黄河水体中的P浓度,说明沙漠颗粒物入河后有向水体释磷的趋势。

关键词: 沙漠颗粒物, 黄河, 磷酸盐, 吸附

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.

Key words: desert particles, phosphate, adsorption, the Yellow River

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