磷促进水铁矿胶体迁移及离子阻滞效应:实验与模型计算

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Abstract The cotransport of FHC with P and P/Na(Ca) in the saturated sand columns was investigated. The results showed that P adsorbed on the FHC provided a negative charge to the FHC, which enhanced the transport of FHC in the quartz sand columns. The enhanced effect mainly occurred at pH 6.0 and 8.0, while it was hardly discovered at pH 4.0. A high concentration of P (10mg/L) had a stronger ability to enhance the transport of FHC. Both Na⁺(1 and 10mmol/L) and Ca²⁺ (0.5mmol/L) could promote the deposition of P-FHC. The retarded effect of Na⁺ on P-FHC transport was owing to ionic strength, and the retarded effect was relatively weak. However, Ca²⁺ retarded FHC transport in multiple ways, including ionic strength, increase in the heterogeneity of charge distribution in the colloidal system, and heteroaggregation between generated precipitate and FHC at high pH. Therefore, retarded effect of Ca on P-FHC transport was strong. The results provided support for further investigation of the environmental behavior of anion-facilitated transport of colloid and nanoparticle.

Key words： ferrihydrite colloids phosphorus partical size zeta potential DLVO transport

Received: 11 January 2023

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X131

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	Articles by authors
	MA Jie
	FENG Bing-cong
	LIU Yong
	CHEN Ya-li
	WENG Li-ping
	LI Yong-tao

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MA Jie,FENG Bing-cong,LIU Yong等. Phosphorus-facilitated transport of ferrihydrite colloid and retardation effect of ion:Experiment and model calculations[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4239-4246.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/4239

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