Mohamed Elnour, Ren Jun, Tao Ling, Mala Azizza
Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou, 730070, P.R. China.
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, P.R. China.
Sci Rep. 2025 Apr 11;15(1):12505. doi: 10.1038/s41598-024-75359-4.
This study aims to evaluate the effectiveness of palygorskite (PAL) modified with various chlorides (PMNaCl), (PMCaCl), (PMMgCl), (PMFeCl) and (PMAlCl) in stabilizing Cu and Ni in contaminated soils. Characterization methods involving Scanning Electron Microscopy (SEM), X-ray deflection (XRD and Fourier Transform Infrared Spectroscopy (FT-IR) were used to characterize the effects of palygorskite on the chemical functional groups of chloride stick and the construction of stabilizers. The Diethylene Triamine Pentaacetic Acid ("DTPA extraction") and Toxicity Characteristic Leaching Procedure (TCLP) were conducted to assess the bioavailability and mobility of Cu and Ni in soil with PAL-modified chlorides. The germinated index (GI) was employed to examine and analyze the microstructure and physico-chemical properties of the contaminated soil. The residue speciation concentration enhanced substantially, illustrating that the heavy metal speciation had stabilized after being with PAL-modified chloride. After the amendment of the PAL-modified chlorides the soil pH was enhanced by 1.33 units, whereas Electrical Conductivity (EC) increased significantly (P < 0.05) from 2.61 to 4.95 µS cm, Cation Exchange Capacity (CEC) increased significantly (P < 0.05) from 11.50 to 13.00 cmol/kg, while the available potassium (K) was significantly (P < 0.05) increased from 51.67 to 69.30, and the available phosphate (P) was significantly (P < 0.05) increased from 0.38 to 0.63. The most significant Sequential Extraction Procedure (BCR) in residual fraction for Cu and Ni in soil treated by PMFC and PMMC were significantly (P < 0.05) increased by 37.37% and 39.33%, respectively. Our findings indicate that PAL-modified chlorides significantly stabilize heavy metals in soil, making them promising candidates for soil remediation.
本研究旨在评估用各种氯化物（PMNaCl、PMCaCl、PMMgCl、PMFeCl和PMAlCl）改性的坡缕石（PAL）在稳定污染土壤中铜和镍方面的有效性。采用扫描电子显微镜（SEM）、X射线衍射（XRD）和傅里叶变换红外光谱（FT-IR）等表征方法来表征坡缕石对氯化物棒化学官能团和稳定剂结构的影响。进行二乙烯三胺五乙酸（“DTPA提取”）和毒性特性浸出程序（TCLP）以评估经PAL改性氯化物处理的土壤中铜和镍的生物有效性和迁移性。采用发芽指数（GI）来检查和分析污染土壤的微观结构和理化性质。残渣形态浓度大幅提高，说明重金属形态在与PAL改性氯化物作用后已稳定。添加PAL改性氯化物后，土壤pH值提高了1.33个单位，而电导率（EC）从2.61显著增加（P < 0.05）至4.95 μS/cm，阳离子交换容量（CEC）从11.50显著增加（P < 0.05）至13.00 cmol/kg，有效钾（K）从51.67显著增加（P < 0.05）至69.30，有效磷（P）从0.38显著增加（P < 0.05）至0.63。用PMFC和PMMC处理的土壤中，铜和镍在残渣态的最显著连续提取程序（BCR）分别显著（P < 0.05）增加了37.37%和39.33%。我们的研究结果表明，PAL改性氯化物能显著稳定土壤中的重金属，使其成为土壤修复的有前途的候选材料。
