Batch adsorption experiments were performed to investigate the effect of different biochars (corn straw biochar (S-CSB), wheat straw biochar (S-WSB), rice husk biochar (S-RHB) and licorice root pulp biochar (S-LRB) each at 3% w/w) application on the kinetics, isotherms and thermodynamic parameters of nickel (Ni) adsorption onto a calcareous soil. The kinetics of Ni adsorption as a function of time was evaluated by seven different kinetic models. Also, the equilibrium adsorption data of Ni were analyzed by the Freundlich, Langmuir, and Temkin adsorption models. Two-constant rate model was best for the description of Ni adsorption kinetic and the S-CSB had the greatest adsorption rate of Ni (a ₌ 841.5 (mg Ni kg⁻¹ h⁻¹)^b and b₌ 0.030 [(mg Ni kg⁻¹)]⁻¹) among all the soil treatments. The Freundlich isotherm model had the best fit for the Ni equilibrium adsorption data, indicating multilayer adsorption. The maximum adsorption capacity of Ni (Q_m) was increased by the addition of all the biochars to the soil and the highest amount was observed in S-CSB treatment (1.683 mg Ni g⁻¹). This was mainly attributed to the CSB properties such as high amounts of CaCO₃ and phosphorus. The Ni adsorption process onto the calcareous soil was endothermic, spontaneous and irreversible in nature according to the thermodynamic parameters (ΔG, ΔH and ΔS). In conclusion, it seems that the S-CSB was the best treatment for Ni immobilization in the calcareous soil.

进行分批吸附实验以研究不同生物炭（玉米秸秆生物炭（S-CSB），小麦秸秆生物炭（S-WSB），稻壳生物炭（S-RHB）和甘草根浆生物炭（S-LRB）的影响含量为3％w / w）应用于石灰质土壤上镍（Ni）吸附的动力学，等温线和热力学参数。通过七个不同的动力学模型评估了镍吸附动力学随时间的变化。而且，Ni的平衡吸附数据通过Freundlich，Langmuir和Temkin吸附模型进行了分析。二恒定速率模型最好地描述了Ni的吸附动力学，S-CSB具有最大的Ni吸附率（a ₌ 841.5（mg Ni kg ^-1  h ^-1）^b和。 在所有土壤处理中，b _＝ 0.030 [（mg Ni kg ^-1）]- ¹）。Freundlich等温模型最适合Ni平衡吸附数据，表明多层吸附。通过向土壤中添加所有生物炭增加了Ni（Q _m）的最大吸附能力，在S-CSB处理中观察到最大量（1.683 mg Ni g ^-1）。这主要归因于CSB特性，例如大量的CaCO ₃和磷。根据热力学参数（ΔG，ΔH和ΔS），在钙质土壤上的Ni吸附过程是吸热的，自然的和不可逆的。总之，似乎S-CSB是钙质土壤中固氮的最佳方法。