Removal of methylene blue from aqueous solutions using biochar derived from a fallen leaf by slow pyrolysis: Behavior and mechanism

Add time:07/24/2019    Source:sciencedirect.com

Biochar made by slow pyrolysis of a fallen leaf of Magnolia Grandiflora L. was prepared for hazardous methylene blue adsorption. The maximum adsorption capacity could reach 101.27 mg/g at 303 K, pH = 12, and 0.1 M ionic strength (NaCl). The elevated pH and ionic strength could increase the adsorption capacity. The characterization results of Brunauer-Emmett-Teller (BET), the scanning electron microscopy (SEM) and Fourier transform infrared spectrum (FT-IR) indicated that the biochar had a superficially porous structure with a high specific surface area and rich in functional groups on the surface. The adsorption fitted the Langmuir model and the adsorption kinetics accorded with pseudo-second-order kinetics model. Thermodynamic analysis proved that the process of methylene blue adsorption was spontaneous and endothermic. Hence, as a novel, excellent and potential material for biochar preparation, the fallen leaf of Magnolia Grandiflora L. could be used for dyes wastewater removal.

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