a School of Applied Meteorology , Nanjing , China.
b Collaborative Innovation Center of Atmospheric Environment and Equipment Technology , Nanjing , China.
Int J Phytoremediation. 2019;21(2):145-151. doi: 10.1080/15226514.2018.1488806. Epub 2019 Jan 18.
Four biochars were made via pyrolysis at 500 °C using different waste plant materials, including tree branches from Cinnamonum campora (L.) Pres (CCP), Eriobotrya japonica (Thunb.) Lindl (EJL), Rohdea roth (RR) and bamboo shoots (Phyllostachys sulphurea) (PS). Phosphorus sorption capacities of the biochars were studied by isothermal experiments on their sorption kinetics. Results show that P sorption to the three wood biochars (CCP, EJL, and RR) fitted well with Lagergren pseudo second order model. However, P release was found in the PS biochar and sand amended with the PS biochar treatments during the isothermal sorption experiment. Phosphorus sorption capacity of the CCP biochar, EJL biochar and RR biochar was 4,762.0, 2, 439.0 and 1, 639.3 mg/kg, respectively. The CCP biochar showed the highest P sorption capacity due to its higher pH, lower dissolved P content, larger surface area (23.067 m/g) and pore volume (0.058 cm/g). The PS biochar showed the lowest P sorption due to its higher dissolved P content, more carboxyl groups, and smaller surface area (2.982 m/g) and pore volume (0.017 cm/g). Results suggest that the CCP biochar could be a potential alternative adsorbent for P sorption, such as removing P in wastewater treatment by constructed wetlands.
四种生物炭是通过在 500°C 下用不同的植物废料热解制成的，包括肉桂（Cinnamomum campora（L.）Pres）树枝（CCP）、桔（Eriobotrya japonica（Thunb.）Lindl）（EJL）、罗氏岩菖蒲（Rohdea roth）（RR）和竹笋（Phyllostachys sulphurea）（PS）。通过等温实验研究了生物炭对磷的吸附动力学，结果表明，三种木质生物炭（CCP、EJL 和 RR）对磷的吸附符合 Lagergren 伪二级动力学模型。然而，在等温吸附实验中，发现 PS 生物炭和添加 PS 生物炭的沙子中存在磷释放。CCP 生物炭、EJL 生物炭和 RR 生物炭的磷吸附容量分别为 4762.0、2439.0 和 1639.3 mg/kg。由于 CCP 生物炭的 pH 值较高、溶解态磷含量较低、比表面积（23.067 m/g）和孔体积（0.058 cm/g）较大，因此对磷的吸附能力最高。PS 生物炭的磷吸附能力最低，因为它的溶解态磷含量较高、羧基较多、比表面积（2.982 m/g）和孔体积（0.017 cm/g）较小。结果表明，CCP 生物炭可能是一种潜在的磷吸附剂替代品，例如在人工湿地处理废水中去除磷。
