通过直接应用粘土性石灰岩,对Cr (III) 和Cd (II) 的共吸附行为
Yonglin Liu1, Shuran He2, Hanfei Gao1
1School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266525, China.
Journal of chromatography. A
|October 11, 2025
概括
在二进制系统中,粘土石灰石有效地去除 (Cr) 和 (Cd). 虽然增强了的去除,但抑制了的吸附,其机制包括沉和离子交换.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
背景情况:
- 重金属污染对环境和健康构成重大风险.
- 天然矿物质,如质石灰岩 (AL) 是成本效益高的吸附剂,用于去除污染物.
- 了解二元金属吸附对于有效的水处理至关重要.
研究的目的:
- 在二进制系统中研究 (Cr(III)) 和 (Cd(II)) 通过质石灰岩 (AL) 的吸附.
- 为了阐明吸附机制和动力学.
- 为了确定pH值和离子强度对吸附的影响.
主要方法:
- 进行了批量吸附实验,使用AL用于Cr (III) 和Cd (II).
- 在不同的pH值和离子强度下分析了吸附能力和动力学.
- 吸附数据与动态和异热模型相匹配.
主要成果:
- 的Cr (III) 吸附能力被Cd (II) 增强,而Cd (II) 吸附能力被Cr (III) 降低.
- 吸附机制包括沉,化和离子交换,最好用伪二阶模型来描述.
- 单次Cr(III) 和Cd(II) 清除的最佳pH分别为7.0和8.0;在二进制系统中,最佳pH转移到Cr(III) 的6.0和Cd(II) 的7.0.
- 增加的离子强度 (Na+,Ca2+) 降低了吸附效率.
结论:
- 状石灰岩在二元金属系统中表现出复杂的吸附行为.
- 这些发现为使用天然矿物质同时进行重金属修复提供了洞察力.
- 这项研究支持AL在环境污染控制中的实际应用.
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