钢铁泥的重新利用:无溶剂制备α-Fe
Zekun Zhao1, Suqin Li1, Yabin Zhang1
1School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Journal of environmental management
|June 3, 2023
概括
这项研究从钢铁泥中开发出具有成本效益的alpha-Fe2O3纳米颗粒,以从废水中去除 (As(III) /As(V)). 这种新方法提供了出色的经济效益和高吸附能力和稳定性的高效去除.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 纳米技术 纳米技术
背景情况:
- 钢泥 (SRS) 是一种富含铁的工业副产品,需要再利用.
- 废水中的污染对环境和健康构成重大风险.
- 开发有效和经济的吸附剂来去除是至关重要的.
研究的目的:
- 通过一种新的无溶剂方法,从SRS中合成具有成本效益的alpha-Fe2O3纳米粒子.
- 研究这些纳米颗粒用于处理含有 (III) 和 (V) 的废水的应用.
- 为了评估合成吸附剂的吸附性能,机制和稳定性.
主要方法:
- 来自SRS的α-Fe2O3纳米颗粒的无溶剂合成.
- 纳米粒子形态,晶体大小和表面积的表征.
- 批量吸附实验,以确定最佳的pH值,动力学和异热量,以去除 (III) / (V).
- 通过循环吸附试验,研究吸附机制和吸附剂稳定性.
主要成果:
- 成功合成了具有小晶体大小 (12.58 nm) 和高表面积 (145.03 m2/g) 的球形α-Fe2O3纳米粒子.
- 吸附剂在广泛的pH范围内表现出有效的去除,在pH为4.0-9.0的As (III) 和pH为2.0-4.0的As (V) 处表现最佳.
- 最大吸附容量 (qm) 为75.67 mg/g的 (III) 和56.07 mg/g的 (V),在5个吸附-脱周期中具有很高的稳定性.
- 吸附遵循伪二次动力学和兰迈尔异热模型,其中As (III) 移除涉及内部球体复合体的形成和As (V) 移除通过静电吸附.
结论:
- 来自SRS的α-Fe2O3纳米颗粒的无溶剂合成为废物回收提供了一个经济可行的途径.
- 合成的纳米颗粒是废水处理中的As (III) 和As (V) 两种高度有效的吸附剂.
- 这种方法符合环境可持续性目标和废物价值技术的发展.
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