通过使用一种新型的多价铁源,将原始氧化作为斯科罗迪特利用的丰富废水固定起来
Zanlang Tang1, Xincun Tang1, Haonan Liu1
1College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.
Chemosphere
|August 9, 2023
概括
一种新型的多价铁源有效地将丰富废水 (A-EW) 固定到无害的scorodite中. 这种方法克服了pH值的波动,实现了99.60%的沉,用于安全处理工业废物.
科学领域:
- 环境科学与工程环境科学与工程
- 无机化学 无机化学
- 材料科学 材料科学 材料科学
背景情况:
- 来自阳极粘土金工业的含丰富废水 (A-EW) 构成重大环境风险.
- 传统的固定方法受到离子 (H+) 积累的阻碍,这破坏了酸盐合成的稳定性.
- 在scorodite形成期间的pH值波动阻碍了有效的固定.
研究的目的:
- 开发一种使用多价值铁源来固定A-EW的新方法.
- 为了克服pH不稳定的局限性,在传统的scorodite合成中.
- 评估拟议方法的热力学可行性和实验有效性.
主要方法:
- 和铁物种之间的共降反应的热力学分析.
- 使用混合铁源 (Fe(OH) 3和FeSO4·7H2O) 进行A-EW的实验固定.
- 使用扫描电子显微镜 (SEM) 和X射线光电谱 (XPS) 进行合成的scorodite的表征.
- 使用毒性特征漏程序 (TCLP) 评估的漏能力.
主要成果:
- 热力学计算证实了与△rGm,Tθ值在 -111.10 到 -33.53 kJ mol-1.1 之间的scorodite共降的可行性.
- 经过优化实验条件 (pH 2.0,Fe:As 比率 1.2,Fe:II:Fe:III 比率 4:6,40 g/L As,95°C) 的测试结果显示,沉比率为99.60%.
- 合成的scorodite通过TCLP表现出正规的八面体微观形态 (5-10微米) 和低可泄漏性 (0.41毫克/升),表明无危害性质.
- 多价铁源通过平衡H+消耗和生成,有效地稳定了溶液pH值为2.0.
结论:
- 拟议的多价铁源有效地将A-EW固定到稳定,无害的scorodite中,克服pH不稳定性问题.
- 合成的石显示出出色的固和低透性,符合环境标准.
- 该方法为含的工业废水,包括来自有色金属工业的废水安全处置提供了有希望的解决方案.
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