Abstract
To suppress the agglomeration of a photocatalyst, facilitate its recovery, and avoid photolysis of dyes, various support materials such as ceramic, carbon, and polymer have been investigated. However, these support materials pose the following additional challenges: ceramic supports will settle down at the bottom of their container due to their high density, while the carbon support will absorb the UV-vis light for its black color. Herein, we propose a floatable, UV transmitting, mesoporous bleached wood with most lignin removal to support P25 nanoparticles (BP-wood) that can effectively, recyclable, three dimensional (3D) photocatalytic degrade dyes such as methylene blue (MB) under ambient sunlight. The BP-wood has the following advantages: (1) The delignification makes the BP-wood more porous to not only quickly transport MB solutions upstream to the top surface, but is also decorated with P25 nanoparticles on the cell wall to form a 3D photocatalyst. (2) The delignification endows the BP-wood with good UV transmittance to undergo 3D photocatalytic degradation under sunlight. (3) It can float on the surface of the MB solution to capture more sunlight to enhance the photodegradation efficiency by suppressing the photolysis of MB. (4) It has comparable or even better photocatalytic degradation of 40 mg/L and 60 mg/L MB than that of P25 nanoparticles suspension. (5) It is green, recyclable, and scalable.
Highlights
IntroductionCost-effectively remove dyes from industrial waste water [1], various technologies, such as physical adsorption [2], photocatalytic degradation, chemical oxidation, and membrane filtration, have been implemented, among which photocatalytic degradation has been demonstrated to be of high efficiency [3,4,5]
In order to rapidly, efficiently, and cost-effectively remove dyes from industrial waste water [1], various technologies, such as physical adsorption [2], photocatalytic degradation, chemical oxidation, and membrane filtration, have been implemented, among which photocatalytic degradation has been demonstrated to be of high efficiency [3,4,5]
As for the control group (P25 nanoparticles are directly added to the methylene blue (MB) solution), shown in Scheme 1c
Summary
Cost-effectively remove dyes from industrial waste water [1], various technologies, such as physical adsorption [2], photocatalytic degradation, chemical oxidation, and membrane filtration, have been implemented, among which photocatalytic degradation has been demonstrated to be of high efficiency [3,4,5]. There are some disadvantages in the use of TiO2 nanoparticle suspension during photocatalytic processes: it tends to agglomerate at high concentrations, and is difficult to separate and recycle from the solution [18,19]. To overcome these disadvantages, TiO2 can be supported on a material that suppresses the agglomeration and facilitates its further recovery. TiO2 can be supported on a material that suppresses the agglomeration and facilitates its further recovery In this context, various support materials, such as ceramic
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