不同的修改方法对的吸附的影响,由来自草,子和竹子的生物炭吸附
Guoliang Chen1,2, Khamphouvanh Viengvilay1, Weijian Yu1,2
1School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
ACS omega
|August 14, 2023
概括
用氧化 (NaOH) 修改生物炭显著提高其吸附 (II) (Mn(II)) 的能力. 最佳吸附取决于选择合适的生物质原料和NaOH修饰方法.
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:
- 纯粹的生物炭通常对重金属具有有限的吸附能力.
- 来自各种生物质来源 (大米,子,竹子) 的生物炭是一种潜在的吸附剂.
- 表面修饰对于提高生物炭吸附性能至关重要.
研究的目的:
- 评估不同修改方法 (HNO3,NaOH,Na2S) 对来自各种生物质原料的生物炭对Mn2吸附的有效性.
- 确定最佳的修改策略和生物质来源,以最大限度地减少Mn2的去除.
- 用同热模型研究吸附行为.
主要方法:
- 通过在气下在600°C下对草,子和竹子进行热解来生产生物炭.
- 使用酸 (HNO3),氧化 (NaOH) 和硫化 (Na2S) 的生物炭的化学修饰.
- 批量吸附实验以评估Mn2的吸收,然后将平衡数据与Langmuir,Freundlich和Temkin等热模型相匹配.
主要成果:
- 与HNO3和Na2S修饰相比,以NaOH修饰的生物炭显示出更高的Mn(II) 吸附能力.
- 在不同生物质原料中,NaOH修饰的有效性各不相同,米,子和竹子生物炭表现出明显的最佳性能.
- 兰穆尔等温模型最好地描述了Mn(II) 在pH 5和30°C时对优化生物炭样本 (R-C,C-NaOH-C,B-NaOH-C) 的吸附.
结论:
- 氧化的修饰在增强生物炭的Mn2吸附能力方面非常有效.
- 选择合适的生物质原料和改造方法对于开发高性能生物炭吸附剂至关重要.
- 优化的生物炭吸附剂显示出从水溶液中去除Mn (II) 的巨大潜力.
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