纤维素水热碳化过程中的镍转化和水碳特性

IF 6.7 1区 工程技术 Q2 ENERGY & FUELS
Fuel Pub Date : 2024-11-23 DOI:10.1016/j.fuel.2024.133772
Peng Zhao , Shijie Yu , Ye Shui Zhang , Heng Cheng , Xiaoxiao Yang , Qinghai Li , Yanguo Zhang , Hui Zhou
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引用次数: 0

摘要

重金属因其毒性大、易在人体内积累、难降解等特点,对环境和人类健康的危害已成为人们关注的焦点。其中,镍被广泛应用于各种工业和消费品中,是一种对人类和环境危害极大的有毒污染物。水热碳化在降低重金属的生态毒性方面具有广阔的前景。然而,热液碳化条件对重金属稳定化的影响和机理仍有待进一步探索。本研究旨在探讨镍在整个热液碳化过程中在纤维素内的迁移和转化。结果表明,由于生成了表面结构复杂的水合碳,水热碳化促进了重金属的固定化。此外,水热碳化过程显著减少了镍的弱结合部分,从而降低了镍的环境风险。添加了镍的纤维素水热碳化过程的最佳条件是 250 ℃ 和 90 分钟。然而,进一步提高反应温度或延长停留时间对镍固定化的影响微乎其微,甚至会产生负面影响。总之,本研究提出了水热碳化对重金属迁移和固定化影响的可能机制,为处理生物质中的重金属提供了启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ni transformation and hydrochar properties during hydrothermal carbonization of cellulose

Ni transformation and hydrochar properties during hydrothermal carbonization of cellulose
The harm of heavy metals to the environment and human health has become a major concern due to their high toxicity, ease of accumulation in the human body, and resistance to degradation. In particular, Ni is widely used in various industrial and consumer products, which is a toxic pollutant posing great harm to humanity and the environment. Hydrothermal carbonization has broad prospects for reducing the ecological toxicity of heavy metals. However, the effects and mechanisms of hydrothermal carbonization conditions on the stabilization of heavy metals still need to be further explored. This research aimed to explore Ni migration and transformation within cellulose throughout the hydrothermal carbonization process. The results indicated that hydrothermal carbonization facilitated the immobilization of heavy metals due to the generation of hydrochars with complex surface structures. In addition, the hydrothermal carbonization process significantly decreased the weakly bound parts of Ni, thereby reducing the environmental risk of Ni. The optimal conditions for the hydrothermal carbonization process of cellulose added with Ni were 250 ℃ and 90 min. However, further increasing the reaction temperature or retention time resulted in negligible or even negative effects on Ni immobilization. In general, this study proposed possible mechanisms for the effects of hydrothermal carbonization on the migration and immobilization of heavy metals, which may provide insights into handling heavy metals in biomass.
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来源期刊
Fuel
Fuel 工程技术-工程:化工
CiteScore
12.80
自引率
20.30%
发文量
3506
审稿时长
64 days
期刊介绍: The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.
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