Sugawara Kazuki, Ichio Kouhei, Ichikawa Yumiko, Ogawa Hitoshi, Suzuki Seiichi
Faculty of Science and Technology, Seikei University, Tokyo 1808633, Japan.
Faculty of Engineering, Tokyo University of Science, Tokyo 1258585, Japan.
Int J Environ Res Public Health. 2022 Apr 25;19(9):5226. doi: 10.3390/ijerph19095226.
Phytoremediation can be applied successfully to solve the serious worldwide issue of arsenic (As) and cadmium (Cd) pollution. However, the treatment of biomass containing toxic elements after remediation is a challenge. In this study, we investigated the effective use of biomass resources by converting the As hyperaccumulator into biochar to adsorb toxic elements. Plant biomass containing As was calcined at 600, 800, and 1200 °C, and its surface structure and adsorption performances for As(V) and Cd were evaluated. Pyrolysis at 1200 °C increased the specific surface area of the biochar, but it did not significantly affect its adsorption capacity for toxic elements. The calcined biochar had very high adsorption capacities of 90% and 95% for As(V) and Cd, respectively, adsorbing 6000 mmol/g-biochar for As(V) and 4000 mmol/g-biochar for Cd. The As(V) adsorption rate was improved by FeCl treatment. However, the adsorption capacity for Cd was not significantly affected by the NaOH treatment. In conclusion, it was found that after phytoremediation using biomass, it can be effectively used as an environmental purification material by conversion to biochar. Furthermore, chemical modification with FeCl improves the biochar's adsorption performance.
植物修复能够成功应用于解决全球范围内严重的砷（As）和镉（Cd）污染问题。然而，修复后含毒元素生物质的处理是一项挑战。在本研究中，我们通过将砷超富集植物转化为生物炭以吸附有毒元素，来探究生物质资源的有效利用。将含砷植物生物质在600、800和1200℃下煅烧，并评估其表面结构以及对As(V)和Cd的吸附性能。1200℃下的热解增加了生物炭的比表面积，但对其对有毒元素的吸附能力没有显著影响。煅烧后的生物炭对As(V)和Cd的吸附容量非常高，分别为90%和95%，对As(V)的吸附量为6000 mmol/g-生物炭，对Cd的吸附量为4000 mmol/g-生物炭。FeCl处理提高了As(V)的吸附率。然而，NaOH处理对Cd的吸附容量没有显著影响。总之，研究发现利用生物质进行植物修复后，通过转化为生物炭可将其有效地用作环境净化材料。此外，用FeCl进行化学改性可提高生物炭的吸附性能。
