Water microdroplets: A catalyst-free source of reactive oxygen species for pollutants removal

被引:4
作者
Wang, Shuanglong [1 ,5 ]
Yang, Jian [4 ,5 ]
Liu, Feng [1 ]
Xiao, Shan [3 ]
Xiao, Fangrong [1 ]
Dong, Xiaofeng [1 ]
Shan, Shan [2 ]
机构
[1] East China Univ Technol, Jiangxi Key Lab Mass Spectrometry & Instrumentat, 418 Guanglan Rd, Nanchang 330013, Peoples R China
[2] Jiangxi Normal Univ, Coll Life Sci, Natl R&D Ctr Freshwater Fish Proc, 99 Ziyang Ave, Nanchang 330022, Peoples R China
[3] East China Univ Technol, Chem Anal & Phys Testing Ctr, Nanchang 330013, Peoples R China
[4] China Acad Chinese Med Sci, Natl Resource Ctr Chinese Mat Med, State Key Lab Qual Assurance & Sustainable Use Dao, Beijing 100700, Peoples R China
[5] Evaluat & Res Ctr Dao Di Herbs Jiangxi Prov, Nanchang 330000, Peoples R China
关键词
Water microdroplets; ROS; Catalytic degradation; Organic pollution; Multi-nozzle device; ADVANCED OXIDATION PROCESSES; PEROXYMONOSULFATE ACTIVATION; HETEROGENEOUS CATALYST; DEGRADATION;
D O I
10.1016/j.jclepro.2023.138444
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Reactive oxygen species (ROS) formation occurs frequently under ambient conditions in enzymatic or nanomaterial-based catalysis and is vitally important during advanced oxidation processes (AOPs). In this work, we demonstrated a spontaneous formation ROS of & BULL;OH, H2O2 and & BULL;O2- in water microdroplets under ambient conditions without any catalysts presenting a real green source of ROS. Control experiments revealed that at the interface of water microdroplets electrons were transferred from OH- to O2, leading to the formation of & BULL;OH (230.25 & mu;M/min), H2O2 (152.5 & mu;M/min) and 1O2 (& BULL;O2- ) (0.11 & mu;M/min), respectively. The generation of the ROS was applied for the oxidative removal of organic pollutants, such as rhodamine B (RhB), methylene blue, nile blue, and fluorescein. A multi-nozzle spraying of water produced large amounts of ROS capable of removing 2 mL RhB solution at 100 & mu;g/mL in 4 h. In sum, compared to the previous works, although this strategy is limited by the production of the ROS, water microdroplets also will be a significant and real green source of ROS without any additives (catalysts, nanomaterials, irradiation UV light, especially chemical reagents) at all. And we believe the limitation will be greatly improved by the designing spray array in the future.
引用
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页数:10
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