. SEM images of BC700 (a) and BC700-PB (b), and TEM images of BC700 (c) and BC700-PB (d)

. N₂ adsorption-desorption curves (a) and pore size distributions (b) of BC700 and BC700-PB

. XRD patterns (a) and FT-IR spectra (b) of BC700-PB and BC700

. Full XPS spectra (a) of BC700 and BC700-PB, core-level XPS spectra of the elemental C1s (b, c) and O1s (d, e) of BC700 (b, d) and BC700-PB (c, e), and N1s (f) of BC700-PB

. Effect of dosage on the removal of NH₃-N by of BC700 and BC700-PB (pH 8, C₀=50 mg/L, t=60 min) (a), effects of pH (dosage=5 g/L, C₀=50 mg/L, t=60 min) (b), initial concentration and coexisting ions (C₀=50 mg/L, dosage=5 g/L, pH 8, t=60 min) (c), and reaction time(dosage=5 g/L, pH 8, C₀=50 mg/L) (d) on the removal of NH₃-N by BC700-PB

. Schematic diagram of adsorption and catalysis removal of ammonia nitrogen by BC700-PB

. Langmuir (a) and Freundlich models (b) of NH₃-N on BC700-PB, and pseudo-first-order kinetic (c) and pseudo-second-order kinetic (d) models of NH₃-N on BC700-PB

. Recycling removal property of BC700-PB (pH 8, dosage=5 g/L, C₀=50 mg/L)

. Effects of adsorbents and additive on the removal efficiency for mixed solution of NH₃-N and HA(pH 2, dosage=5 g/L, C₀=50 mg/L) (a), and EPR spectra of DMPO-OH (b) adducts in the systems of BC700-PB