Synergistic adsorption mechanism of aqueous Cu(Ⅱ)and TC by N and S co-doped biochar
The co-pollution of water environment containing heavy metals and antibiotics has received extensive attention and research.Magnetic biochar(Fe-BC)owns fine adsorption performance for multiple pollutants in water,but that was limited by the structure of primary biochar.The doping of heteroatoms(N,S,etc.)is one of the ideal methods to change their internal structure and effectively improve their adsorption performance.Based on this,N and S co-doped magnetic biochar(Fe/N/S-BC)was synthesized with FeCl3·6H2O as magnetic precursor,bagasse fiber as carbon source,while urea,thiourea and ammonium sulfate as doping materials,and compared its structure and performance with undoped and monodoped magnetic biochar(Fe-BC,Fe/N-BC,Fe/S-BC).The maximum adsorption capacity of Fe/N/S-BC for Cu(Ⅱ)and TC mono polluted systems reached at 230.70mg/g and 93.63mg/g,respectively,and the adsorption models were more accorded with the pseudo-secondary-order and Langmuir models.In the binary polluted system,the addition of TC promoted the adsorption of Cu(Ⅱ),while the addition of Cu(Ⅱ)had the effect from promotion to suppression for TC adsorption.The adsorption of Fe/N/S-BC to Cu(Ⅱ)and TC mainly involved cation-π interaction,complexation,hydrogen bonding,electrostatic attraction,pore diffusion(filling),etc.Due to the co-doping of N and S,Fe/N/S-BC had a better adsorption performance than others and realized the synergistic adsorption for Cu(Ⅱ)and TC binary pollutants,which had potential application as a kind of good water environment remediation material.
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