MRGO-FMBO原位修复砷污染含水层

为了探究磁性氧化石墨烯负载铁锰氧化物复合材料（MRGO-FMBO）修复砷污染地下水的可行性，通过一维模拟柱和二维模拟槽实验探讨了MRGO-FMBO在含水层的迁移和分布情况，分析了材料注入浓度和注入速度对其迁移的影响，研究了MRGO-FMBO在注入模拟地下水含水层后反应带的形成及演化过程.结果表明，MRGO-FMBO在饱和多孔介质中迁移性能良好，在设定的浓度范围（1~8g/L）内，升高注入浓度能减少材料在介质中的残留百分比，增强其迁移性能.当注入速度为0.023~0.057cm/s时，存在一个速度临界值，当注入速度小于此值时，改变速度对MRGO-FMBO在含水层中的迁移性影响显著；当注入速度大于此值时，速度不再是影响迁移的主要因素.MRGO-FMBO在注入地下含水层后能够形成稳定的反应带，反应带在20d内对砷的去除效率达到70.6%，在整个反应带的发展过程中可去除7.79mg As.MRGO-FMBO在砷污染含水层原位修复中具有较好的应用前景.

In-situ remediation of arsenic contaminated aquifer by MRGO-FMBO

To explore the feasibility of magnetic graphene oxide based Fe-Mn composite oxides (MRGO-FMBO) for remediation of As(III) polluted groundwater, simulation column experiments and two-dimensional sand box experiments were conducted to discuss the migration and distribution of MRGO-FMBO in aquifers. The effects of injection rate and concentration on the migration were explored and the development and evolution of reaction zone after the injection of MRGO-FMBO into the aquifer were studied. MRGO-FMBO presented good mobility in saturated porous media. Within the concentration range set in this study(1~8g/L), higher injection concentration led to better material mobility and less residue in simulated columns. A critical velocity value between 0.023~0.057cm/s existed that the change of injection velocity had a significant impact on the migration when it was under the critical value. However, the velocity was not the main factor affecting migration when the value was higher than the critical velocity. Besides, MRGO-FMBO could form a stable reaction zone after being injected into the underground aquifer with As remediation efficiency of 70.6% in 20days. During the whole development of the reaction zone, 7.79mg of As could be removed totally. Therefore, these results indicated that MRGO-FMBO had a good application prospect in in-situ remediation of arsenic-contaminated aquifers.