Carbonate-Enhanced Transformation of Ferrihydrite to Hematite

铁酸盐 赤铁矿 碳酸盐 针铁矿 化学 无机化学 矿物学 有机化学 吸附
作者
Ying Li,Meijun Yang,Martin Pentrák,Hongping He,Yuji Arai
出处
期刊:Environmental Science & Technology [American Chemical Society]
卷期号:54 (21): 13701-13708 被引量:41
标识
DOI:10.1021/acs.est.0c04043
摘要

An elevated activity of (bi)carbonate in soils and sediments (pCO2, ∼2%) above current atmospheric CO2 (∼0.04%) could influence the iron cycling in mineral-water interfacial chemistry. However, the impact of (bi)carbonate on mineral transformation is unclear. Here, a model short range-ordered iron oxyhydroxide, two-line ferrihydrite, was used to evaluate the impact of (bi)carbonate on mineral transformation at near-neutral pH using experimental geochemistry, X-ray diffraction, X-ray absorption spectroscopy, transmission electron microscopy, and Fourier transform infrared spectroscopy. Results showed that (bi)carbonate promoted the transformation of ferrihydrite to hematite and retarded the goethite formation. As pCO2 increased from 408 to 20,000 ppmv at 40 °C, the transformation efficiency of ferrihydrite increased from 53 to 95%, and the formation of hematite increased from 13 to 76%. During the formation of hematite, a terminal ligand on a Fe(III)O6 octahedral monomer such as a hydroxyl or water was displaced to form Fe(III)O6 octahedral dimers and/or polymers. Because the Fe–O bond of ≡(Fe–O)2–CO is much weaker than that of ≡Fe–O–H, the −O2CO group can be more easily replaced by two terminal −OH groups; the dehydration/rearrangement between Fe(III)O6 octahedral monomers was enhanced under high pCO2. Results suggest that high carbonate activity is an important geochemical parameter controlling the occurrence of hematite in oxic environments and, in turn, iron cycling in the critical zone.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
澡雪发布了新的文献求助10
1秒前
耶耶耶完成签到,获得积分20
2秒前
左丘万怨完成签到,获得积分10
3秒前
wt1123发布了新的文献求助10
3秒前
打打应助张达采纳,获得10
4秒前
5秒前
Muhammad发布了新的文献求助10
5秒前
左丘万怨发布了新的文献求助10
6秒前
区区完成签到,获得积分10
7秒前
8秒前
piers完成签到,获得积分10
8秒前
小二郎应助咩咩咩采纳,获得10
8秒前
10秒前
10秒前
11秒前
RYAN发布了新的文献求助10
13秒前
量子星尘发布了新的文献求助10
13秒前
SSS发布了新的文献求助10
13秒前
Steven发布了新的文献求助10
14秒前
小蘑菇应助fuje采纳,获得10
15秒前
ding应助fuje采纳,获得10
15秒前
Jasper应助fuje采纳,获得10
15秒前
灵巧的傲丝完成签到,获得积分10
15秒前
16秒前
pyg完成签到,获得积分10
16秒前
gujianhua发布了新的文献求助10
16秒前
16秒前
515完成签到,获得积分20
17秒前
17秒前
18秒前
19秒前
20秒前
21秒前
21秒前
arui发布了新的文献求助10
21秒前
咩咩咩发布了新的文献求助10
23秒前
23秒前
24秒前
zeroZWY完成签到,获得积分10
24秒前
刘佳会完成签到,获得积分20
26秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 700
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
Indomethacinのヒトにおける経皮吸収 400
Effective Learning and Mental Wellbeing 400
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3976126
求助须知:如何正确求助?哪些是违规求助? 3520340
关于积分的说明 11202586
捐赠科研通 3256847
什么是DOI,文献DOI怎么找? 1798509
邀请新用户注册赠送积分活动 877645
科研通“疑难数据库(出版商)”最低求助积分说明 806516