Preparation of macroalgae biochar and its application in removal of phenanthrene from aqueous solution
To investigate the removal of phenanthrene(Phe)from aqueous solutions,four macroalgae(Enteromorpha prolifera,Eucheuma,Gracilariopsis lemaneiformis,Laminaria japonica)were selected to prepare biochar at different temperatures(300,500 and 700 ℃).Structural characterization,including elemental analysis,Brunauer-Emmett-Teller(BET),Thermogravimetry(TG),Scanning Electron Microscopy(SEM),and Fourier Transform Infrared Spectroscopy(FTIR)analyses,were carried out to compare the differences among the four biochars.Eucheuma biochar(EBC500)had the highest specific surface area(271.51 m2·g-1)and the highest Phe removal rate(96.36％).Kinetic model fitting showed that the adsorption of EBC500 was determined by a combination of chemical and physical adsorption and intraparticle diffusion.EBC500 was fitted,using the Langmuir and Freundlich equations.The fitted R2 values were greater than 0.93.EBC500 exhibited both monolayer and multilayer adsorptions.Regeneration experiments showed that the removal rate of Phe was higher than 98％.
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万方数据
维普
