Modified biochar(NPBC)was prepared with phosphoric acid-ammonia modification method,and its phase,morphology and elements were characterized with X-ray diffraction,field emission scanning electron microscopy and X-ray spectrometer.The effects of SDZ concentration,NPBC dosage and seawater components(NaCl,MgCl2,Na2SO4,CaCl2,KC1)on the adsorption performance of biochar were studied,and the adsorption kinetics of the adsorption process were explored.The results showed that the adsorption effect was best when the concentration of SDZ was 10 mg·L-1 and the addition of NPBC was 0.4 g·L-1.The substances in seawater hindered adsorption and the effects of NaCl,MgCl2 and GaCl2 accounted for 21.62％,15.72％and 14.94％,respectively.The adsorption experiment reached equilibrium within 120 min,and the maximum adsorption capacity was 6.71 mg·g-1 which was more in line with the quasi-second-order kinetic equation.A new way for the removal of sulfonamide antibiotics from seawater is provided.
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