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Paper-based Photocatalysts Immobilization without Coffee Ring Effect for Photocatalytic Water Purification

Authors :
Ruiming Wang
Xiaowen Huang
Hongxia Zhang
Xiaoning Zhang
Qingwei Li
Maocui Lyu
Huichao Lin
Source :
Micromachines, Micromachines, Vol 11, Iss 3, p 244 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

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.

Details

ISSN :
2072666X
Volume :
11
Database :
OpenAIRE
Journal :
Micromachines
Accession number :
edsair.doi.dedup.....b70f4621dc831323ef6972b119002e07
Full Text :
https://doi.org/10.3390/mi11030244