School of Environment and Resources, Xiangtan University, Xiangtan, 411100, China.
Environ Sci Pollut Res Int. 2022 Apr;29(19):28984-28994. doi: 10.1007/s11356-021-17335-3. Epub 2022 Jan 7.
The surface properties of the adsorbents and the acidic environment have an influence effect on Pb adsorption. In order to further improve the adsorption performance of biochar, we herein reported an effective method to synthesize high-adsorbed biochar by co-doping with nitrogen and phosphorus. After atom doping, the N/P co-doped biochar (NP-BC) showed the enhanced adsorption capacity for lead ion (Pb). The adsorption kinetics, isotherm, pH value, and influencing factors were studied. The results show that the synthesized NP-BC has high Pb adsorption capacity in aqueous solution, and can be maintained with various environmental interference factors including pH, natural organic matter, and other metal ions. High adsorption performance shows that the material may be well used to remove Pb in various water bodies. Various characterization experiments prove that surface properties contribute to Pb adsorption, and the high performance of NP-BC is mainly due to the surface complexation between functional groups and Pb. This work demonstrates that the surface functional groups of biochar are critical to the development of high-performance heavy metal adsorbents.
吸附剂的表面性质和酸性环境对 Pb 吸附有影响作用。为了进一步提高生物炭的吸附性能，我们在此报道了一种通过氮磷共掺杂合成高吸附性生物炭的有效方法。原子掺杂后，N/P 共掺杂生物炭（NP-BC）对铅离子（Pb）表现出增强的吸附能力。研究了吸附动力学、吸附等温线、pH 值以及影响因素。结果表明，合成的 NP-BC 在水溶液中具有高的 Pb 吸附能力，并且可以在包括 pH 值、天然有机物和其他金属离子在内的各种环境干扰因素下保持。高吸附性能表明，该材料可能很好地用于去除各种水体中的 Pb。各种特征化实验证明表面性质有助于 Pb 吸附，而 NP-BC 的高性能主要归因于官能团与 Pb 之间的表面络合。这项工作表明生物炭的表面官能团对开发高性能重金属吸附剂至关重要。
