1.Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University,Yichang 443002,Hubei,China
2.College of Basic Medical Science,China Three Gorges University,Yichang 443002,Hubei,China
3.College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang 443002,Hubei,China
Corn straw ash (CSA) and corn straw biochar (CSB) were produced from agricultural waste corn straw through natural incineration and oxygen separation pyrolysis techniques. CSA and CSB were added to the soil (S) at a mass fraction of 1% to form S-CSA and S-CSB, respectively. A comprehensive investigation was conducted to analyze the adsorption performances and mechanisms of glyphosate by absorbents (S, S-CSA, S-CSB). The results show that the adsorption capacity of glyphosate by S-CSA decreases, while the adsorption capacity of glyphosate by S-CSB increases compared with S. Notably, the adsorption capacity of S-CSB is 15.22 times as higher as that of S-CSA by the same mass of corn straw, and the return of corn straw to the field in the form of biochar is more conducive to the adsorption of glyphosate by the soil. The adsorption processes of glyphosate by adsorbents conform to the quasi-second-order kinetic model and Langmuir monolayer chemisorption model, and the adsorption process is spontaneous and endothermic. The increase in glyphosate adsorption by S-CSB is due to the amplified specific surface area and oxygen-containing functional groups. In contrast, the decrease in glyphosate adsorption by S-CSA is attributed to the enhancement of electrostatic repulsion and phosphate competition.
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