数字农科院2.0

Facilitated transport of ferrihydrite with phosphate under saturated flow conditions

文献类型： 外文期刊

作者： Tufail Shah;Kang Zhao;Ai Chen;Atif Muhmood;Syed Atizaz Ali Shah;Muhammad Kashif Irshad;Yuji Arai;Jianying Shang

作者机构：

关键词： Adsorption;Facilitated transport;Ferrihydrite;Phosphate;Porous media

期刊名称： Journal of Contaminant Hydrology

ISSN： 0169-7722

年卷期： 2024 年 265 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： With increasing phosphate (P) entering the environment during agricultural application, the subsurface flow of particular P has been recently discussed as a vital P transport pathway. Iron (oxyhydr)oxide colloid-facilitated P transport is critical for iron and P biogeochemical processes in the subsurface. This study investigated the ferrihydrite colloid-facilitated P transport through adsorption and column experiments under different P concentrations and three pH conditions. Increased P loading on ferrihydrite colloids decreased the transport of ferrihydrite colloids (< 8.0%) under acid conditions through pore straining and irreversible attachment. Under neutral and alkaline conditions, ferrihydrite colloids exhibited more negative surfaces and smaller diameters with increasing P, which further enhanced ferrihydrite colloid transport (maximum to 95.6%). Ferrihydrite colloid-facilitated P transport was limited under acid conditions, and it was 10% - 57% enhancement under neutral and alkaline conditions with increasing P adsorption. Under neutral conditions, ferrihydrite colloid-facilitated P transport was strongest (maximum to 68.84%) because of its stronger ferrihydrite colloid transport than under acid conditions and larger P adsorption capacity than under alkaline conditions. Our findings indicate that the facilitated transport of ferrihydrite colloids in the presence of P may be appreciable in iron and phosphate-rich soil and subsurface systems, which is essential for evaluating the fate of iron and iron-facilitated P and potential environmental risks of P transport in the subsurface.

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