二氧化锰同时诱导溶解有机物的转化和保护:结晶度的意义

IF 11.3 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Zhiqiang Wang, Haoran Zhao, Zihan Shi, Haokai Zhao, Shu Chen, Zhuoyan Chen, Yuntao Yuan, Chi Zhang, Bin Jia and Hanzhong Jia*, 
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引用次数: 0

摘要

二氧化锰(MnO2)与溶解有机物(DOM)之间的相互作用一直是科学探究的主题。然而,MnO2结晶度对DOM命运的影响尚不清楚。本文全面研究了不同结晶度(结晶度顺序:γ-30 <;γ-90 & lt;γ-120)。结果表明:DOM吸附与MnO2的比表面积(SSA)呈正相关;SSA最大的γ-30对DOM的吸附量最高,起到保护DOM的作用。而SSA较小的γ-90和γ-120可诱导美拉德反应,从而促进地聚合有机物的形成,导致DOM的生物利用度降低。MnO2矿化DOM的能力以γ-120 >的数量级递减;γ-90比;γ-30,由Mn4+和羟基自由基(·OH)的含量决定。其中,γ-30、γ-90和γ-120的自由基基氧化对DOM矿化的贡献分别为64.8%、47.4%和23.7%。我们提出二氧化锰的结晶度可能对地质时期的全球碳循环具有重要但迄今未被探索的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Manganese Dioxides Induce the Transformation and Protection of Dissolved Organic Matter Simultaneously: A Significance of Crystallinity

Manganese Dioxides Induce the Transformation and Protection of Dissolved Organic Matter Simultaneously: A Significance of Crystallinity

Interactions between manganese dioxides (MnO2) and dissolved organic matter (DOM) have long been the subject of scientific inquiry. However, the effect of MnO2 crystallinity on the DOM fate remains unclear. Herein, we comprehensively investigate the adsorption, protection, and mineralization of DOM by MnO2 with various crystallinities (order of crystallinity: γ-30 < γ-90 < γ-120). The results show that DOM adsorption is positively correlated with the specific surface area (SSA) of MnO2; γ-30 with the largest SSA adsorbs the highest amount of DOM, resulting in DOM protection. However, γ-90 and γ-120 with a smaller SSA could induce the Maillard reaction and thereby promote the formation of geopolymerized organic matter, leading to reduced bioavailability of DOM. Furthermore, the capability of MnO2 to mineralize DOM decreases in the order γ-120 > γ-90 > γ-30, and it is determined by both Mn4+ and hydroxyl radical (·OH) content. In particular, the contribution of radical-based oxidation of ·OH to DOM mineralization is 64.8, 47.4, and 23.7% for γ-30, γ-90, and γ-120, respectively. We propose that crystallinity of MnO2 may have a significant but hitherto unexplored influence on the global carbon cycle over geological time.

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来源期刊
环境科学与技术
环境科学与技术 环境科学-工程:环境
CiteScore
17.50
自引率
9.60%
发文量
12359
审稿时长
2.8 months
期刊介绍: Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.
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