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Abstract
Photocatalytic water purification is important for the degradation of organic pollutants, attracting intensive interests. Photocatalysts are preferred to be immobilized on a substrate in order to reduce the laborious separation and recycling steps. To get uniform irradiation, the photocatalysts are preferred to be even/uniform on the substrate without aggregation. Generally, the “coffee ring effect” occurs on the substrate during solvent evaporation, unfortunately resulting in the aggregation of the photocatalysts. This aggregation inevitably blocks the exposure of active sites, reactant exchange, and light absorption. Here, we reported a paper-based photocatalyst immobilization method to solve the “coffee ring” problem. We also used a “drop reactor” to achieve good photocatalytic efficiency with the advantages of large surface area, short diffusion lengths, simple operation, and uniform light absorption. Compared with the coffee ring type, the paper-based method showed higher water purification efficiency, indicating its potential application value in the future.
Highlights
Water pollution is a serious problem especially in modern industrial cities, which is a bad by-product of the prosperity of industry
Li et al proposed an optofluidic microreactor with staggered micropillars in the reaction microchamber to mainly enlarge the surface area for loading catalysts and increase the active surface area [17]
The color of methylene blue in the paper-based method showed obvious lightening after 6 min, which can be clearly distinguished by the naked eye
Summary
Water pollution is a serious problem especially in modern industrial cities, which is a bad by-product of the prosperity of industry. Li et al proposed an optofluidic microreactor with staggered micropillars in the reaction microchamber to mainly enlarge the surface area for loading catalysts and increase the active surface area [17] In these works, the photocatalysts were all immobilized in different ways because photocatalysts are preferred to be immobilized on a substrate in order to reduce the laborious separation and recycling steps [18]. In our previous work [19], we developed a drop reactor method, which showed the merits of large surface areas, short diffusion lengths, simple operation, as well as higher efficiency than the traditional slurry method. The color of methylene blue in the paper-based method showed obvious lightening after 6 min, which can be clearly distinguished by the naked eye This simple and highly efficient method with the advantages of being “coffee ring effect-free” and uniform light absorption offers a convenient tool for both photocatalytic water purification and self-cleaning paper development
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