Adsorption of Phenanthrene and Pyrene in Water by Modified Biochar
We modified the biochar prepared from rice husk,characterized the surface structure and functional group properties of the modified biochar with infrared spectroscopy analysis,scanning electron microscopy analysis and specific surface area analysis and carried out the adsorption kinetic and adsorption isothermal test for phenanthrene and pyrene by applying MBC.It was shown that(1)compared with BC,MBC increased the N-H functional group,the specific surface area increased 5.34 times,and the number of adsorption sites increased;(2)the results of the adsorption tests indicated that the use of quasi-secondary kinetics was more suitable for describing the adsorption process;through the adsorption isotherm tests,it was found that the Freundlich model could describe the adsorption process of MBC on phenanthrene and pyrene more accurately.(3)The dosage of MBC had a large influence on the adsorption effect;the initial pH range was 3-11,and acidic or alkaline conditions had little effect on the adsorption effect.Therefore,ammonia modified biochar is expected to be a new adsorption material for removing polycyclic aromatic hydrocarbon pollution from water.
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