关于二甲基酸盐修饰吸附剂的稳定性的洞察:二甲基酸盐的氧化
Keisuke Nakakubo1, Foni B Biswas2, Tsuyoshi Taniguchi3
1National Institute of Advanced Industrial Science and Technology (AIST), Department of Energy and Environment, Environmental Management Research Institute, 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan.
随着时间的推移,单二硫酸盐修饰纤维素 (DMC) 由于硫化硫酸的形成而失去金属吸附能力. 这影响了重金属去除应用,突出了对稳定吸附剂的需求.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 分析化学 分析化学
背景情况:
- 单二甲基碳酸盐改性纤维素 (DMC) 对各种重金属具有很高的吸附性.
- 在环境条件下储存后,DMC对酸盐的吸附能力显著下降.
研究的目的:
- 为了研究DMC在储存后吸附多重金属的稳定性.
- 阐明观察到吸附性能下降背后的机制.
主要方法:
- 在DMC储存之前和之后对金属吸附的比较分析.
- 里埃变换红外光谱 (FTIR) 用于识别存储的DMC中的结构变化.
- 测试金属吸附的dialkyl thiuram二硫化物,以确认该机制.
主要成果:
- 在储存后,DMC显示了PbII,AgI,PtIV和PdII的吸附率降低.
- AuIII和CdII的吸附在很大程度上没有受到影响.
- FTIR分析和吸附试验证实了从dithiocarbamate组中形成thiuram二硫化物.
结论:
- 储存的DMC吸附能力降低的主要原因是硫化硫酸的氧化形成.
- 这一发现对于理解dithiocarbamate基吸附剂在金属整治中的长期性能至关重要.
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