用绿色合成修改的多壁碳纳米管上吸:pH,动力和平衡研究
Marcela Pires Spaolonzi1, Mariana Gomes Oliveira1, Mariana Cardoso Barros Ribeiro1
1School of Chemical Engineering, Universidade Estadual de Campinas, Av. Albert Einstein, 500, Campinas, São Paulo, Brazil.
Environmental science and pollution research international
|December 8, 2023
概括
功能绿色碳纳米管 (MWCNT-B) 有效地从水中吸附甲醇 (PROP). 这种吸附剂可重复使用四个周期,在水处理应用中显示出有前途的潜力.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 吸附科学 吸附科学
背景情况:
- 醇 (PROP) 是一种广泛使用的β-阻断剂,其在水生环境中的存在带来了生态风险.
- 传统的废水处理方法可能无法有效地去除像PROP.这样的药品.
- 开发新型吸附剂,以有效地去除药物,对于环境保护至关重要.
研究的目的:
- 调查功能绿色碳纳米管 (MWCNT-B) 的吸附性能,以从水溶液中去除醇 (PROP).
- 评估pH,动力学,平衡,热力学和可重复使用性对MWCNT-B.PROP吸附的影响.
- 确定PROP吸附的最佳条件,并评估MWCNT-B作为可持续吸附剂的潜力.
主要方法:
- 关于MWCNT-B的特征,包括零电荷点 (pHPZC = 3.31) 和PROP的特征 (pKa = 9.67).
- 在各种pH值下进行的吸附实验,随后进行动力,平衡和热力学分析.
- 通过多个吸附再生循环评估吸附剂的可重复使用性.
主要成果:
- MWCNT-B证明了在pH值范围3-9的有效PROP去除,在pH值11的去除减少.
- 吸附动力学遵循伪第一阶 (PFO) 模型,在30-90分钟之间达到平衡.
- 兰慕尔模型准确地描述了吸附等温度 (R2>0.95),表明了自发的,有利的和外热吸附 (ΔG < -20 kJ mol-1 , ΔH = -33 kJ mol-1).
- 在四个重复使用周期中,MWCNT-B吸附剂保持了令人满意的性能.
结论:
- 功能化绿色碳纳米管 (MWCNT-B) 是一种高效且可重复使用的吸附剂,用于提取普拉诺洛尔.
- 吸附过程是高效的,自发的和外热的,使MWCNT-B成为处理药物污染水的有希望的材料.
- MWCNT-B提供了一种可持续和有吸引力的解决方案,用于从水生母体中去除醇.
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