作者： Yu Yang, Zhongbo Wei, Xiaolong Zhang, Xu Chen, Dongmei Yue, Qian Yin, Lin Xiao, , Liuyan Yang

State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210023, PR China

School of the Environment, Nanjing University, Nanjing 210023, PR China

摘要：A novel bio-adsorbent was successfully synthesized by pyrolyzing Alternanthera philoxeroides (AP), one of the most widely used hydrophytes for eutrophic lake ecological restoration under O2-limited condition at 600 °C. Compared with commercially active carbon (AC), the initial solution pH had a weak effect on the adsorption of Pb(II) by AP biochar (APB). The maximum adsorption capacity of APB for Pb(II) was 257.12 mg/g, which was 5.3 times of that of the AC. The adsorption process was fast, with only 2.5 h to reach adsorption equilibrium. The adsorption mechanism of Pb(II) by APB involves the precipitation and complexation of Pb(II) with free carboxyl/hydroxyl functional groups and mineral carbonates of APB as well as ion replacement between Pb(II) and alkaline earth cations. These results suggest that using a low-cost APB adsorbent for heavy metals contaminated water treatment may have great ecological and environmental significance.

关键词：Alternanthera philoxeroides; Biochar; Pb(II); Adsorption