对废水和土壤中的稳定性研究,通过改性煤基酸残留物进行稳定
Yingnan Wang1, Hui Liu2, Weike Wang1
1Yellow River Institute of Hydraulic Research, YRCC, Zhengzhou, 450003, China.
Environmental pollution (Barking, Essex : 1987)
|January 10, 2025
概括
酸改性酸残留物 (N-HAS) 有效地从污染的土壤和水中去除 (Hg2+). 这种可持续材料减少了农作物和土壤中的,证明了其对环境修复的潜力.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 土壤科学 土壤科学
背景情况:
- 基于煤炭的湿酸残留物 (HAS) 是一种具有吸附污染物潜力的废物.
- 土壤和水中的 (Hg2+) 污染对环境和健康构成重大风险.
- 提高HAS对重金属的吸附能力对于其有效利用至关重要.
研究的目的:
- 为了制备酸改性酸残留物 (N-HAS),提高了Hg2+的吸附能力.
- 通过N-HAS研究Hg2+的吸附机制,动力学和异温.
- 通过实地试验,评估N-HAS在降低玉米中的Hg含量和土壤中可用的Hg方面的有效性.
主要方法:
- 使用水热方法对HAS进行酸盐修饰,以产生N-HAS.
- 使用SEM,FTIR和XRF进行HAS和N-HAS的表征.
- 批量吸附实验以确定Hg2+吸附能力,动力学和异热量.
- 实地试验评估N-HAS对玉米和土壤中含量的影响.
主要成果:
- 根据伪二次动力学和兰格穆尔异温模型,N-HAS的最大Hg2+吸附能力为124.20 mg/g.
- 在5个吸附-脱附周期后,N-HAS表现出稳定的循环吸附性能,超过80%的Hg2+被去除.
- 实地试验显示,N-HAS显著降低了玉米核中的Hg含量 (27.44%-72.09%) 和可用的土壤Hg (50.00%-82.80%),同时增加了生物质.
结论:
- 酸修饰显著提高Hg2+吸附能力和酸残留的性能.
- N-HAS是对Hg2+污染水和土壤的整治有前途的材料,可利用废物的资源.
- 在实地试验中,N-HAS的最佳应用率被确定为0.4 kg/m2.
相关概念视频
00:46Bioremediation
18.2K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.2K
01:06Coagulation
264
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
264
04:01Factors Affecting Solubility
33.0K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.0K