检索结果-南通市图书馆

Distinct roles of pH and organic ligands in the dissolution of goethite by cysteine

Journal of Environmental Sciences 2022年第3期34卷 260-268页

作者： Ji Li Chenlu Shi Wenbin Zeng Yaru Wang Zebin Hong Yibing Ma Liping Fang Faculty of Material Sciences and Chemistry China University of GeosciencesWuhan 430074China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Institute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangzhou 520650China Macao Environmental Research Institute Macao University of Science and TechnologyTaipa 999078MachaoChina

Electron shuttles such cysteine play an important role in Fe cycle and its availability in soils,while the roles of pH and organic ligands in this process are poorly understood.Herein,the reductive dissolution process of goethite by cysteine were explored in the presence of organic ligands.Our results showed that cysteine exhibited a strong reactivity towards goethite-a typical iron minerals in paddy soils with a rate constant ranging from 0.01 to0.1 hr^(-1).However,a large portion of Fe(Ⅱ) appeared to be "structural species" retained on the surface.The decline of pH was favorable to generate more Fe(Ⅱ) ions and enhancing tendency of Fe(Ⅱ) release to solution.The decline of generation of Fe(Ⅱ) by increasing pH was likely to be caused by a lower redox potential and the nature of cysteine pH-dependent adsorption towards goethite.Interestingly,the co-existence of oxalate and citrate ligands also enhanced the rate constant of Fe(Ⅱ) release from 0.09 to 0.15 hr-1;nevertheless,they negligibly affected the overall generation of Fe(Ⅱ) in opposition to the pH effect.Further spectroscopic evidence demonstrated that two molecules of cysteine could form disulfide bonds(S-S) to generate cystine through oxidative dehydration,and subsequently,inducing electron transfer from cysteine to the structural Fe(Ⅲ) on goethite;meanwhile,those organic ligands act as Fe(Ⅱ) "strippers".The findings of this work provide new insights into the understanding of the different roles of pH and organic ligands on the generation and release of Fe induced by electron shuttles in soils.

关键词： Electron transfer Reductive dissolution iron cycling Organic ligands

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Intracellular biomineralization in bacteria

Intracellular biomineralization in bacteria

引用

中国科学院地质与地球物理研究所2014年度（第14届）...

作者： Wei Lin Karim Benzerara Damien Faivre Yongxin Pan Biogeomagnetism Group Paleomagnetism and Geochronology LaboratoryKey Laboratory of Earth and Planetary PhysicsInstitute of Geology and GeophysicsChinese Academy of Sciences France-China Bio-Mineralization and Nano-Structures Laboratory Chinese Academy of Sciences Department of Biomaterials Max Planck Institute of Colloids and Interfaces

Microorganisms have populated the Earth for billions of years and their activities are important forces shaping our planetary environments through biogeochemical cycles.In particular,microbial biomineralization that selectively take up environmental elements and deposit minerals either intracellularly or extracellularly is of great interest,because these processes play vital roles in the global cycles of numerous elements,such as Fe,Mn,Ca,As,O,S,and P,etc.Biominerals,the products of

关键词： microbial biomineralization magnetotactic bacteria magnetosome magnetotaxis iron cycling biosignature ancient environment

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：