In this study, a lanthanum(La)-loaded biochar was prepared by impregnating, loading, and carbonizing La oxide nanoparticles with biochar derived from corn stalk and was used to study its removal of As(Ⅴ) from aqueous solutions. The prepared La-biochar was characterized by scanning electron microscopy(SEM)and X-ray photoelectron spectra(XPS). The effects on As(Ⅴ)adsorption by various factors, including adsorbent rate, contact time, solution p H, and initial As(Ⅴ)concentrations, were investigated. The removal...