ABSTRACT

This study aimed to investigate the effects of cypress cone biochar (RB) and its modifications (chitosan-coated biochar (CB), acid-modified biochar (AB), alkali-modified biochar (ALB), humic acid-coated biochar (HB), walnut shell residue extraction-coated biochar (WB), ball-milled biochar (BMB)) on the behavior of nickel (Ni) in Ni-spiked calcareous soil. The biochars were added separately to the soil at the rates of 1.5% and 3%, and the Ni behavior was investigated using methods of desorption kinetics and sequential extraction. The modification process significantly changed the specific area and functional groups of BMB, CB and HB compared to RB. Application of CB (26.3%), HB (28.7%), ALB (28.8%), BMB (30.7%), AB (31.9%) and RB (32.6%) showed the most effects on reduction of Ni mobility factor compared to control soil sample (38.8%). The results of Ni desorption showed high effectiveness of CB, BMB, ALB and HB, in reducing the Ni release compared to the control soil sample. Overall, our findings indicated that among the modified biochars, BMB, CB and HB showed a good performance in Ni stabilization, due to the simple and low-cost process of physical modification. BMB can be suggested as a suitable amendment for soil Ni immobilization.

摘要

本研究旨在探讨柏木生物炭（RB）及其改性剂（壳聚糖涂层生物炭（CB）、酸改性生物炭（AB）、碱改性生物炭（ALB）、腐植酸涂层生物炭（HB））的效果。 , 核桃壳渣提取涂层生物炭 (WB), 球磨生物炭 (BMB)) 对镍 (Ni) 在加镍钙质土壤中的行为的影响。将生物炭以 1.5% 和 3% 的比例分别添加到土壤中，并使用解吸动力学和顺序提取的方法研究 Ni 的行为。与RB相比，修饰过程显着改变了BMB、CB和HB的特定区域和功能组。与对照相比，CB (26.3%)、HB (28.7%)、ALB (28.8%)、BMB (30.7%)、AB (31.9%) 和 RB (32.6%) 对降低 Ni 迁移率因子的影响最大土壤样品（38.8%）。Ni 解吸结果表明，与对照土壤样品相比，CB、BMB、ALB 和 HB 在减少 Ni 释放方面的有效性很高。总体而言，我们的研究结果表明，在改性生物炭中，由于物理改性过程简单且成本低，BMB、CB 和 HB 在 Ni 稳定方面表现出良好的性能。BMB 可以作为土壤镍固定的合适改良剂。