关键词: 退化土壤, 鹅绒萎陵菜, 克隆生长, 生物量分配

Abstract: Taking activated carbon as a carrier, an activated carbon-loaded nano zero-valent iron (NZVI/AC) adsorbent was prepared for arsenate (As(V)) removal. With the removal rate of As(V) as the target, an optimization was conducted on the particle size of activated carbon, the species and concentrations of iron salts, the reaction temperature and reaction rate, the marinated duration of iron salts in activated carbon, and the equilibrium time of reaction. In considering of the As(V) removal rate and the practical utilization of NZVI/AC, the prepared NZVI/AC could have the best efficacy (98% removal of As(V)) when the particle size of activated carbon was 20-40 mesh, KBH₄ drop-addition speed was 1 ml·min^-1, the marinated duration of ferrous sulfate with a mass concentration 6.9% in activated carbon at 25 ℃ was 30 min, and the equilibrium time of reaction was 30 min.

Key words: Degraded soil, Potentilla anserina, Clonal growth, Biomass allocation