用Mg/Fe双金属氧化物加载的污泥衍生生物炭去除和:批量吸附,动力学和机制
Weixiong Lin1, Jiali Zhou2, Shuiyu Sun2,3
1School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing, 526061, China. linweixiong@zqu.edu.cn.
概括
这项研究用Mg/Fe双金属氧化物增强了污水污泥生物炭,用于优质的重金属去除. 修改后的生物炭实现了 (Pb) 和 (Cd) 的高吸附能力,主要是通过矿物沉.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 水处理 处理水的方法
背景情况:
- 生物炭是一种有前途的吸收剂,可以从水中去除重金属.
- 提高生物炭的吸附能力对于有效的水处理至关重要.
- 来自污水污泥的生物炭为吸附剂开发提供了可持续的资源.
研究的目的:
- 为了提高污水污泥衍生生物炭的重金属吸附能力.
- 为了研究Mg/Fe双金属氧化物加载生物炭对Pb (II) 和Cd (II) 的吸附性能.
- 阐明改性生物炭的吸附机制和物理化学特性.
主要方法:
- 用Mg/Fe双金属氧化物加载的污泥衍生生物炭 ((Mg/Fe) LDO-ASB) 的制备.
- 对于Pb (II) 和Cd (II) 的去除进行批量吸附实验.
- 使用SEM-EDS,FTIR,XRD和XPS分析吸附动力学,异热和物理化学特性.
主要成果:
- (Mg/Fe) LDO-ASB的最大吸附能力为Pb (II) 的408.31 mg/g和Cd (II) 的270.41 mg/g.
- 吸附是自发化学吸附和异质多层吸附之后的,薄膜扩散是限制速度的步骤.
- 主要的吸附机制包括矿物沉,离子交换,金属-π相互作用和功能组复杂化.
结论:
- Mg/Fe双金属氧化物加载显著提高了生物炭的重金属吸附能力.
- 矿物沉是Pb (II) 和Cd (II) 吸附的主要机制,其次是离子交换.
- (Mg/Fe) LDO-ASB是一种高效的吸附剂,用于从污染水中去除Pb (II) 和Cd (II).
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