图 1 Fe3+浸渍膨润土对砷酸物种的吸附机理[21]
Figure 1. Adsorption mechanism of As(Ⅴ) onto the montmorillonite layer of Fe(Ⅲ)-impregnated bentonite[21]
图 2 金属物种支撑的生物碳表面改性[31]
Figure 2. Biochar surface modification by impregnating metals and providing metal element support[31]
图 3 改性生物碳固定砷的潜在机制[32]
Figure 3. Graphical representation of potential mechanisms for the immobilization of As on modified biochar surface[32]
图 4 磁铁矿表面吸附(缺氧)和干燥(氧化)过程中的氧化还原反应示意图[80]
Figure 4. Schematic of proposed redox reactions on magnetite surface during adsorption (anoxic) and drying (oxic) processes[80]
图 5 柱实验装置简图
Figure 5. Schematic diagram of column experimental equipment
图 6 (a)地下水中的砷浓度等值线;(b)试验区试点PRB和监测井的位置;(c)PRB周围和内部的监测井地图[91]
Figure 6. (a) arsenic concentrations in groundwater; (b) locations of pilot-PRB and monitoring wells in the test area; (c) maps of monitoring wells around and inside the PRB[91]
图 7 试点1、试点2和PRB的位置[92]
Figure 7. Location of Pilot 1, Pilot 2 and full-scale PRB[92]
图 8 PRB横截面中的岩芯样品位置[93]
Figure 8. Core sample location in PRB cross section[93]
图 9 PRB位置图[94]
Figure 9. PRB position map[94]