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来自城市固体废物焚烧飞灰的层状双氧化物合成,用于重金属吸附

Qionghao Wang¹, Yaqi Peng¹, Min Chen²

¹State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China.

The Science of the total environment

|December 22, 2023

概括

城市固体废物焚烧飞灰 (MSWI FA) 可以通过水热方法转化为有价值的分层双氧化物 (LDH). 这些合成的LDH有效地从废水中去除Cd2+和Cu2+等重金属.

科学领域:

环境化学环境化学
材料科学材料科学材料科学
废物管理废物管理

背景情况:

城市化推动了城市固体废物焚烧飞灰 (MSWI FA) 产量的增加.
有效地处置和利用MSWI FA是关键的环境挑战.
开发MSWI FA的增值应用程序对于可持续的废物管理至关重要.

研究的目的:

通过水热方法从MSWI FA合成CaAl层状双氧化物 (LDHs).
为了研究合成参数对LDH晶度的影响.
评估废水中重金属合成LDH的吸附性能.

主要方法:

使用MSWI FA作为前体的LDHs的热水合成.
通过BET,SEM,XRD,FT-IR和XPS合成的LDHs的表征.
吸附实验以确定重金属去除效率 (Cd2+,Cu2+).

主要成果:

从MSWI FA成功合成了CaAl LDHs,确定了Ca和Al离子以及Cl-, SO42-,和CH3COO-离子.
在LDH中,Cd2+ (730 mg·g-1) 和Cu2+ (446 mg·g-1) 的吸附能力高.
吸附机制包括等态替代,复杂化和沉.

结论:

热水合成为MSWI FA在LDHs中的价值化提供了一条有效的途径.
合成的LDHs作为MSWI FA液净化中的高效吸附剂起作用.
这种方法为从废物中制造环保吸附剂提供了一种新的方法.

关键词:

吸附方式吸附方式吸附方式重金属是一种重金属.的 LDHs 的 LDHs.在MSWI飞灰飞行.

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