Transport and retention of phosphorus in soil with addition of Mg-Al layered double hydroxides: Effects of material dosage, flow velocity and pH
作者： Xiaoqian Jiang , Binggang Yan , Jiayu Chen , Wenyan Li , Jiawei Hu
DOI: 10.1016/J.CEJ.2019.122154
关键词: Layered double hydroxides 、 Inorganic chemistry 、 Soil water 、 Soil mixing 、 Chemistry 、 Soil pH 、 Flow velocity 、 Solid phases 、 Phosphorus 、 Lower velocity
摘要: Abstract Mg-Al layered double hydroxides (LDHs) were applied to soils control phosphorus (P) loss. Column experiments conducted with soil and LDHs under saturated conditions investigate the retention release of P various dosages, flow velocity, pH. The retardation breakthrough in enhanced increasing dosages pH as well decreasing velocity. was successfully analyzed using a two kinetic sites model that accounted for irreversible reversible retentions. Increasing bring greater maximum retained concentration on solid phases (Smax1, i.e. retention) LDHs-soil system. For retention, rate from site 2 (k2d) than first-order coefficient (k2) most reflects rapid process near equilibrium transport behavior It is worth noting change (8–5) Darcy velocity (0.17–0.65 cm min−1) has little influence mixing LDHs. stability increases higher pH, lower
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