Humic substances mediated superior photochemical pollutant conversion on defective TiO2 in environmentally relevant matrices: The key roles of oxygen vacancy in surface interactions, oxidant activation and radical generation

化学 光化学 吸附 氧化还原 氧气 污染物 电子转移 腐植酸 活性氧 激进的 配体(生物化学) 化学工程 无机化学 有机化学 肥料 生物化学 工程类 受体
作者
Song Hu,Lyumeng Ye,Bing-Jie Tian,Jiaying Li,Ai-Yong Zhang,Lu Zhao,Chi Zhang,Chu Jiang,Zhixian Lin,Da Wei,Qixin Wei
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:921: 171145-171145 被引量:3
标识
DOI:10.1016/j.scitotenv.2024.171145
摘要

Ubiquitous humic substances usually exhibit strong interfering effects on target pollutant removal in advanced water purification. This work aims to develop a photochemical conversion system on the nonstoichiometric TiO2 for pollutant removal in environmentally relevant matrices. In this synergistic reaction system, the redox-reactive humic substances and defective oxygen vacancies can serve as the organic electron transfer mediator and the key surface reactive sites, respectively. This system achieves a superior pollutant degradation in real surface water at low oxidant concentrations. Reactive oxygen vacancies on the TiO2 surface and sub-surface are of considerable interest for this photochemical reaction system. By engineering defective oxygen vacancies on high-energy {001} polar facet, the surface and electronic interactions between tailored TiO2 and humic substances are greatly strengthened for the promoted electron transfer and oxidant activation. Rendered by the strong surface affinity and molecular activation, defective oxygen vacancies thermodynamically and dynamically promote reactive chain reactions for free radical formation, including the selective O2 reduction to ·O2− and the H2O2 activation to ·OH. Our findings take new insights into environmental geochemistry, and provide an effective strategy to in-situ boost the humic substances-mediated water purification without secondary pollution. Humic substances are widely distributed in aquatic environment, thus playing important roles in environmental geochemistry. For example, humic substances can achieve good surface adsorption through electrostatic adsorption, ligand exchange and electronic interactions with typical TiO2 to form reactive ligand-metal charge transfer complexes for pollutant degradation. Inspired by the unique properties of surface and sub-surface oxygen vacancies, the defective TiO2 was designed to refine the humic substances-mediated photochemical reactions. A superior reactivity was measured for pollutant degradation. Our findings provide an effective strategy to boost naturally photochemical decontamination in environmentally relevant matrices.
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
脸小呆呆完成签到 ,获得积分10
2秒前
michaelxia发布了新的文献求助10
2秒前
zhilianghui0807完成签到 ,获得积分10
6秒前
满天星辰独览完成签到 ,获得积分10
11秒前
白月光完成签到,获得积分10
12秒前
张大侠完成签到,获得积分20
13秒前
echo发布了新的文献求助20
13秒前
eee完成签到,获得积分10
20秒前
ybheart完成签到,获得积分0
21秒前
单纯乘风完成签到 ,获得积分10
22秒前
蔡从安完成签到,获得积分20
23秒前
且歌行完成签到,获得积分10
24秒前
cp3xzh完成签到,获得积分10
25秒前
哈哈哈完成签到 ,获得积分10
32秒前
咯咯咯完成签到 ,获得积分10
34秒前
活泼初之完成签到 ,获得积分10
36秒前
一个小菜鸡完成签到,获得积分10
37秒前
阿泽完成签到 ,获得积分10
43秒前
tt完成签到 ,获得积分10
44秒前
青黛完成签到 ,获得积分10
45秒前
后陡门的夏天完成签到 ,获得积分10
46秒前
月夕完成签到 ,获得积分10
48秒前
优秀的芯完成签到,获得积分10
51秒前
于洋完成签到 ,获得积分10
51秒前
小刘哥加油完成签到 ,获得积分10
53秒前
熊雅完成签到,获得积分10
57秒前
斯文败类应助一个小胖子采纳,获得10
1分钟前
laohu完成签到,获得积分10
1分钟前
1分钟前
夏日香气完成签到 ,获得积分10
1分钟前
方方完成签到 ,获得积分10
1分钟前
鲜于雁芙完成签到 ,获得积分10
1分钟前
彭于晏应助科研通管家采纳,获得10
1分钟前
完美世界应助科研通管家采纳,获得10
1分钟前
华仔应助科研通管家采纳,获得10
1分钟前
1分钟前
chloe完成签到 ,获得积分10
1分钟前
忐忑的草丛完成签到,获得积分10
1分钟前
何博发布了新的文献求助10
1分钟前
1分钟前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
Immigrant Incorporation in East Asian Democracies 600
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
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 3968559
求助须知:如何正确求助?哪些是违规求助? 3513391
关于积分的说明 11167370
捐赠科研通 3248808
什么是DOI,文献DOI怎么找? 1794465
邀请新用户注册赠送积分活动 875116
科研通“疑难数据库(出版商)”最低求助积分说明 804664