In order to solve the phosphorus pollution caused by organic phosphorus in industrial wastewater and realize the resource utilization of agricultural waste,agricultural waste biochar (wheat straw,corn straw and peanut shell powder) was impregnated and modified with MgCl2 and CeCl3 solution.The adsorption properties of modified biochar on hydroxyethylidene diphosphonic acid (HEDP) in water were investigated.The results showed that wheat straw biochar WS-2Mg/Ce with a molar ratio of MgCl2 and CeCl3 of 2∶1 had the best removal effect on HEDP in water,with an adsorption capacity of (3.48±0.06)mg/g and a removal rate of (84.56±1.43)%.When the dosage of WS-2Mg/Ce was 2.5g/L,pH=6 and the initial HEDP concentration was 10mg/L,the removal rate of HEDP was the highest.The reaction was basically equilibrated after 2880min,and the coexisting anions had little effect on the adsorption.The adsorption results were more consistent with the pseudo-second-order kinetic equation,indicating that the adsorption process was dominated by chemical adsorption.Isothermal adsorption experiments revealed that Freundlich model had a higher correlation coefficient,the adsorption process was multi-layer adsorption,and raising the temperature was beneficial to the reaction.
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基金资助
重庆市科技局项目(CSTB2022NSCQ-MSX1438;CSTB2022TIAD-KPX0201;cstc2017shmsA20011)
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