Using cattail-sludge biochar and polyethylene to prepare structured biochar as adsorbents

KH2PO4 and NH4Cl as adsorbents

the preparation of structured biochar and its adsorption performance to nitrogen and phosphorus in water were studied. The single factor experiment method was used to screen and characterize the optimal parameters of structural biochar. The research results show that: structured biochar is prepared with 60% sizing amount

5 N·cm-2 molding pressure

160℃ molding temperature

and 95 min molding time; the adsorption of nitrogen and phosphorus by the structured biochar conforms to the Langmuir model

which is simple Molecular layer adsorption

has higher affinity for phosphorus than nitrogen

and the adsorption of nitrogen and phosphorus on structural biochar is spontaneously beneficial; structural biochar is better than cattail-sludge biochar

which improves the hydrophobicity and stability of structural biochar. The surface particles are tightly bound

and the adsorption mechanism of nitrogen and phosphorus can be attributed to pore filling

electrostatic adsorption

and hydrogen bonding.