ABSTRACT

Biochar has received continuous attention in recent years due to its high specific surface area, rich micropores, and many types of functional groups. In this study, the migration behavior of modified micro-nano biochar (MMNBC) in heterogeneous media under the influence of ionic strength and flow rate was studied by column experiments. The results showed that the mobility of MMNBC could be increased by increasing the flow rate and decreasing IS. The retention of MMNBC in quartz sand coated with clay minerals was higher than that of pure quartz sand, and the difference existed due to the surface properties. The main reason is that the clay mineral coating adds cations on the surface of quartz sand, which generates electrostatic interaction with MMNBC, which promote the adsorption of MMNBC on the medium. This study provides a theoretical basis for effectively controlling the groundwater environment problems caused by the migration of biochar.

摘要

生物炭由于具有高比表面积、丰富的微孔和多种官能团等特点，近年来受到持续关注。本研究通过柱实验研究了改性微纳生物炭（MMNBC）在离子强度和流速影响下在异质介质中的迁移行为。结果表明，增加流速和降低 IS 可以增加 MMNBC 的流动性。MMNBC在粘土矿物包覆石英砂中的保留率高于纯石英砂，且由于表面性质不同而存在差异。主要原因是粘土矿物涂层在石英砂表面添加了阳离子，与MMNBC产生静电相互作用，促进了MMNBC在介质上的吸附。