Silver single atoms and nanoparticles on floatable monolithic photocatalysts for synergistic solar water disinfection

IF 15.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Nature Communications Pub Date : 2025-01-24 DOI:10.1038/s41467-025-56339-2

Jian Wang, Jiahe Zhang, Yang Li, Xinghui Xia, Hengjing Yang, Jae-Hong Kim, Wen Zhang

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Abstract

Photocatalytic water disinfection technology is highly promising in off-grid areas due to abundant year-round solar irradiance. However, the practical use of powdered photocatalysts is impeded by limited recovery and inefficient inactivation of stress-resistant bacteria in oligotrophic surface water. Here we prepare a floatable monolithic photocatalyst with ZIF-8-NH₂ loaded Ag single atoms and nanoparticles (Ag_SA+NP/ZIF). Atomically dispersed Ag sites form an Ag−N charge bridge, extending the lifetime of charge carriers and thereby promoting reactive oxygen species (ROS) generation. The photothermal effect of the plasmonic Ag nanoparticles reduces the bacterial resistance to ROS and impairs DNA repair capabilities. Under sunlight irradiation, the synergistic effect of Ag single atoms and nanoparticles enables 4.0 cm² Ag_SA+NP/ZIF to achieve over 6.0 log inactivation (99.9999%) for the stress-resistant Escherichia coli (E. coli) in oligotrophic surface water within 30 min. Furthermore, 36 cm² Ag_SA+NP/ZIF is capable of disinfecting at least 10.0 L of surface water, which meets the World Health Organization (WHO) recommended daily per capita drinking water allocation (8.0 L). This study presents a decentralized and sustainable approach for water disinfection in off-grid areas.

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银单原子和纳米粒子在可浮式单片光催化剂上的协同太阳能水消毒

由于离网地区全年太阳辐照度丰富，光催化水消毒技术在离网地区具有很大的应用前景。然而，粉末光催化剂的实际应用受到低营养地表水中抗逆性细菌的有限回收和低效失活的阻碍。本文制备了一种负载ZIF-8- nh2的Ag单原子和纳米粒子（AgSA+NP/ZIF）的可浮式单片光催化剂。原子分散的Ag位形成Ag−N电荷桥，延长载流子的寿命，从而促进活性氧（ROS）的产生。等离子体银纳米粒子的光热效应降低了细菌对活性氧的抵抗力，损害了DNA修复能力。在阳光照射下，Ag单原子和纳米粒子的协同作用使4.0 cm2 AgSA+NP/ZIF在30分钟内对寡营养地表层水中的抗逆性大肠杆菌（E. coli）实现超过6.0 log（99.9999%）的失活。此外，36平方厘米的AgSA+NP/ZIF能够对至少10.0升的地表水进行消毒，达到世界卫生组织（世卫组织）建议的每日人均饮用水分配（8.0升）。本研究提出了一种分散和可持续的方法，用于离网地区的水消毒。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.