In this study, batch and column experiments were conducted to investigate the effect of MgO nanoparticles (NPs), humic acid and biochar for boron (B) immobilization in contaminated soil. Results showed that the fate and mobility of B was controlled by adsorption reactions and the amount of B adsorption increased in soil treated with MgO at 2% wt while the amount of B adsorption declined in presence of humic acid and biochar treatments. Maximum adsorption on the basis of isothermal curves was 85.9, 94.0, 50.9 and 83.6 mg kg⁻¹ for control, MgO, humic acid and biochar treatments, respectively. Fractionation of isotherm experiments in soil treated by MgO NPs, humic acid and biochar indicated that compared to control soil the exchangeable fractions decreased in all treatment at initial B concentration of 2 mg L⁻¹ while an increase was observed at initial B concentration of 10 mg L⁻¹. Boron in organic fraction has also enhanced by biochar and humic acid application while this fraction reduced in presence of MgO NPs. Residual fraction showed an increase in presence of MgO NPs and biochar at low initial concentration of B while it reduced in soil treated with humic acid. Column breakthrough testing indicated the outlet concentration becomes equal to the inlet concentration after pore volumes of 4, 26, 3 and 1 for soil control, soils treated by MgO NPs, humic acid and biochar, respectively.

在这项研究中，进行了分批和柱实验，以研究MgO纳米颗粒（NPs），腐殖酸和生物炭对于将硼（B）固定在污染土壤中的作用。结果表明，硼的去向和迁移受吸附反应控制，在2％wt的MgO处理下，土壤中B的吸附量增加，而在腐殖酸和生物炭处理下B的吸附量下降。根据等温曲线，对照，MgO，腐殖酸和生物炭处理的最大吸附分别为85.9、94.0、50.9和83.6 mg kg ^-1。用MgO NPs，腐殖酸和生物碳处理的等温线实验的分馏表明，与对照土壤相比，在初始B浓度为2 mg L的情况下，所有处理中可交换分数均降低^-1，而在初始B浓度为10 mg L ^-1时观察到增加。施用生物碳和腐殖酸还增强了有机级分中的硼，而当存在MgO NP时，该级分中的硼也降低了。残留分数表明，在较低的B初始浓度下，MgO NPs和生物碳的存在增加，而在腐殖酸处理的土壤中则减少。色谱柱穿透测试表明，对于土壤控制，分别由MgO NP，腐殖酸和生物炭处理过的土壤，孔浓度分别为4、26、3和1后，出口浓度等于入口浓度。