纤维支持防止由酸吸附剂的溶解沉引起的合物促进污染
Eleazer L Vivas1, Keon-Woo Kim1, Yong Jae Suh2
1Department of Environmental Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Republic of Korea.
Journal of environmental management
|June 13, 2023
概括
聚烯二烯酸纤维 (PANFs) 防止有毒合物在用二酸二酸水 (DCPD) 清除危险金属时形成. 这种方法通过促进异质核化而不是有害的同质核化来抑制二次污染.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 稀溶性吸附剂的溶解沉可以导致有毒的合体悬浮物,在去除危险金属过程中引起二次污染.
- 酸二 (DCPD) 是一种稀溶性吸附剂,用于去除金属污染物.
- (Cd2+) 是一种危险的金属污染物,可以形成有毒的合物.
研究的目的:
- 在使用DCPD和Cd2+的模型吸附系统中调查合物促进污染的预防.
- 探索使用聚烯酸纤维 (PANFs) 作为支基质来抑制有毒合物的形成.
主要方法:
- 建立了一个模型吸附系统,使用DCPD粉末和500毫克L-1Cd2+溶液,pH约7.0.
- 研究了带有Cd的亚微粒的形成,并没有添加PANFs.
- 分析了粒子大小,体积和相位,以了解核和生长机制.
主要成果:
- 在没有PANF的情况下,通过溶解沉形成的球形Cd载体初级颗粒 (0.040-0.95μm) 聚合物,其亚微米颗粒体积为10.8%.
- PANFs抑制了Cd载体合体的同质核化,促进了异质核化,并形成了一个新阶段的六边形柱状微粒 (Cd5H2(PO4) 4·4H2O).
- 虽然PANFs将Cd吸附能力降低到DCPD的56.7%,但它们有效地防止了有毒Cd载体聚合物的形成.
结论:
- PANF上的异质核化是一种有效的策略,可以防止危险金属吸附期间的合物促进的二次污染.
- PANFs改变了核和生长过程,导致形成更大,更无害的微粒,而不是有毒的亚微粒合物.
- 将其他稀溶性吸附剂与PANF结合,为减轻环境修复中的二次污染提供了一个有希望的方法.
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