Removal performance and mechanism of aqueous methylene blue by green synthesized iron nanoparticles supported on corn straw biochar
Cherry plum iron nanoparticles-loaded biochar(ZY-FeNPs@BC)was synthesized using cherry plum leaf extract as the reducing agent.The synthesis method was optimized in terms of the ratio of leaf to ethanol,ratio of iron to carbon,and synthesis temperature.The ZY-FeNPs@BC was characterized by SEM-EDS,FTIR,XRD,and XPS.Experiments were conducted to study the effects of time,temperature,initial methylene blue(MB)concentration,initial pH,co-existing anions,and real water on the removal of MB.And the removal mechanisms were analyzed with the combination of adsorption isotherms and kinetics.The results show that the removal efficiency rose with the increase of pH or adsorption temperature.Under the conditions of 2 m mol·L-1 coexsiting anions,river water or tap water,ZY-FeNPs@BC could still had a good performance on the removal of MB with low concentration.The removal of MB followed quasi-second-order kinetics and the Langmuir model,and the removal process was spontaneous and endothermic.At natural pH and the temperature of 60 ℃,the maximum adsorption amount to MB was 287.7 mg·g-1.After 4 regeneration and recycles,ZY-FeNPs@BC still had a good performance on MB removal.The MB removal mechanisms by ZY-FeNPs@BC included electrostatic adsorption,C=N hydrogenation,co-precipitation,etc.This study not only contributes to the reuse of plant solid waste but also provides an environmentally friendly method for removing MB pollution.
iron nanoparticlescherry plum leafbiocharmethylene bluegreen synthesis
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