College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, PR China; Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.
Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, PR China.
Bioresour Technol. 2020 May;303:122947. doi: 10.1016/j.biortech.2020.122947. Epub 2020 Feb 3.
Enhanced macroalgal biochars with large specific surface areas (up to 399 m g), partly graphitized structure, high nitrogen doping (up to 6.14%), and hydrophobicity were fabricated by co-carbonization of macroaglae, ferric chloride, and zinc chloride. These biochars were used as sorbents for the removal of polycyclic aromatic hydrocarbons from water. The sorption capacity of polycyclic aromatic hydrocarbons onto macroalgal biochars was high (up to 90 mg g), and recycling by thermal desorption was practicable. We revealed the physical-dominated multilayer sorption process, based on results from characterization and sorption experiments. Pore filling, mass transfer, π-π stacking, and the partition effect were found to be possible sorption mechanisms. This study suggests that porous graphitized nitrogen-doped biochars may be synthesized from macroalgae with simple one-pot carbonization and display promising applicability for sorption removal of organic pollutants from water.
通过将大型藻类、三氯化铁和氯化锌共碳化，制备出具有大比表面积（高达 399 m2/g）、部分石墨化结构、高氮掺杂（高达 6.14%）和疏水性的增强型大型藻类生物炭。这些生物炭可用作从水中去除多环芳烃的吸附剂。多环芳烃在大型藻类生物炭上的吸附容量很高（高达 90mg/g），并且通过热解吸进行回收是可行的。我们通过表征和吸附实验的结果揭示了物理控制的多层吸附过程。发现孔填充、质量传递、π-π堆积和分配效应是可能的吸附机制。本研究表明，多孔石墨化氮掺杂生物炭可能是由大型藻类通过简单的一锅碳化合成的，并且对于从水中吸附去除有机污染物具有广阔的应用前景。
