Effect of Binding Agent Removal on Aggregation of Lou Soil Nanoparticles

YAN Yuyang; ZHANG Xinran; TANG Yao; HU Feinan; GENG Zengchao; XU Chenyang

doi:10.13870/j.cnki.stbcxb.2024.04.002

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Effect of Binding Agent Removal on Aggregation of Lou Soil Nanoparticles

更新时间：2025-03-12

- Effect of Binding Agent Removal on Aggregation of Lou Soil Nanoparticles
- Vol. 38, Issue 4, Pages: 382-390(2024)
- 作者机构：
  
  1. 西北农林科技大学资源环境学院, 陕西杨凌,712100
  2. 西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌,712100
  3. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
  4. 西北农林科技大学西北农业部植物营养与农业环境重点实验室, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2024.04.002
  CLC： S153.3
- Published：2024
- 稿件说明：
移动端阅览
YAN Yuyang, ZHANG Xinran, TANG Yao, et al. Effect of Binding Agent Removal on Aggregation of Lou Soil Nanoparticles[J]. 2024, 38(4): 382-390.
DOI：

YAN Yuyang, ZHANG Xinran, TANG Yao, et al. Effect of Binding Agent Removal on Aggregation of Lou Soil Nanoparticles[J]. 2024, 38(4): 382-390. DOI： 10.13870/j.cnki.stbcxb.2024.04.002.

摘要

[目的] 为探究胶结物质对土壤胶体颗粒凝聚的影响

明确其分别促进土壤团聚体结构形成的微观机理。[方法] 采用超声分散结合高速离心法从土中提取3种土壤纳米颗粒

分别是土提取得到的土壤纳米颗粒(NP-Lou)、去除有机碳土中的纳米颗粒(NP-OCR)和去除无机碳土中的纳米颗粒(NP-ICR)。采用动态光散射仪测定3种土纳米颗粒在Na+、Ca2+和La3+体系中的凝聚动力学过程、临界聚沉浓度(CCC)及表面电位值

结合Derjauin-Landau-Verwey-Overbeek(DLVO)理论计算土纳米颗粒的Hamaker常数及相互作用能变化。[结果] 在相同溶液化学条件下

与NP-Lou相比

NP-OCR和NP-ICR凝聚速率减小

CCC值增大。NP-OCR和NP-ICR的zeta电位绝对值低于NP-Lou

导致纳米颗粒间静电排斥势能降低。DLVO理论计算表明

NP-OCR和NP-ICR的Hamaker常数也低于NP-Lou;即去除无机碳或有机碳后

土壤纳米颗粒的范德华引力也随之降低。合力计算结果表明

去除无机碳或有机碳后土壤纳米颗粒间相互作用的总势能高于NP-Lou

所以CCC值更大。NP-ICR和NP-Lou的CCC差值大于NP-OCR和NP-Lou的CCC之差

因此土壤无机碳对土纳米颗粒凝聚的影响更大。[结论] 无机碳和有机碳通过增大土土粒间相互作用的Hamaker常数来增强吸引势能

这是胶结物质促进土壤团聚体稳定的重要原因。

Abstract

[Objective] To investigate the effect of binding agent on the aggregation of soil colloidal particles and to clarify the microscopic mechanism of the formation of soil aggregate structures. [Methods] Soil nanoparticles (NP) were obtained from Lou soil

namely NPs from original Lou soil (NP-Lou)

NPs from organic carbon-removed soil (NP-OCR)

and NPs from inorganic carbon-removed soil (NP-ICR). The aggregation kinetics

critical coagulation concentrations (CCCs) and surface electricity of three kinds of Lou soil nanoparticles in Na+

Ca2+ and La3+ systems were determined by dynamic light scattering. The Hamaker constant and interaction energy of soil nanoparticles were calculated by Derjauin-Landau-Verwey-Overbeek (DLVO) theory. [Results] In the same solution chemistry condition

the aggregation rate of NP-OCR and NP-ICR decreased and the CCCs value increased compared with NP-Lou. The absolute value of zeta potential of NP-OCR and NP-ICR was lower than that of NP-Lou

which resulted in the decrease of electrostatic repulsive potential energy between nanoparticles. The theoretical calculation of DLVO showed that the Hamaker constant of NP-OCR and NP-ICR was also lower than that of NP-Lou. That was

the attractire van der Waals potential energies of soil nanoparticles also decreased after the removal of inorganic carbon and organic carbon. The combined force calculation results showed that the total potential energy of the interaction between soil nanoparticles after removing inorganic carbon or organic carbon was higher than NP-Lou

so the CCC value was larger. The CCCs difference between NP-ICR and NP-Lou was larger than the CCC difference between NP-OCR and NP-Lou

therefore

soil inorganic carbon affected Lou soil NP aggregation more strongly. [Conclusion] Inorganic carbon and organic carbon enhance the attractive potential energy by increasing the Hamaker constant of the interaction between soil particles

which is important for cementing materials to promote the stability of soil aggregates.

关键词

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