Constructing porous beads with modified polysulfone-alginate and TiO2 as a robust and recyclable photocatalyst for wastewater treatment

Ch Tahir Mehmood; Ziyi Zhong; Hua Zhou; Yeyuan Xiao

doi:10.1016/j.jwpe.2020.101601

Constructing porous beads with modified polysulfone-alginate and TiO₂ as a robust and recyclable photocatalyst for wastewater treatment

Ch Tahir Mehmood, Ziyi Zhong, Hua Zhou, Yeyuan Xiao^*

^*Corresponding author for this work

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

The availability of suitable support material for immobilizing photocatalyst, without loss of photoactivity, is a bottleneck for photocatalytic wastewater treatment in real-world applications. Here we report a facile method for the preparation and pore structure modification of highly stable and porous polymer composite consisting of polysulfone (PSF) and alginate (Alg) for immobilizing TiO₂ nanoparticles. Compared to its constituents alone, this newly identified polymer composite has much higher stability as well as adsorption capacity towards the pollutant molecules, acting as an ideal matrix for immobilizing the photocatalyst. Various combinations of PSF, Alg, and TiO₂ were tested in the form of beads, with the final ratio of 10:6:12, for the best adsorption and photodegradation capacity. With surface modification, these beads (denoted as PAT-12 M) showed superior photocatalytic activity toward methylene blue (MB) and the two pharmaceuticals – triclosan (TCS) and diclofenac (DCF), which were almost completely removed within 50, 40 and 120 min, respectively. The reactive oxygen species scavenging experiments confirmed the ^[rad]OH radicals played the primary role in photodegradation. The robustness of these beads allowed their use for at least 25 cycles under batch mode and 30 days in continuous mode with over 99% MB degradation. Thanks to the large size (3 mm) and excellent mechanical stability, these beads can be effortlessly dispersed in polluted solutions, in interswitchable suspended or floating form, and easily recovered. With these advantageous properties, PAT-12 M beads could be effectively employed for a wide range of applications at large scales.

Original language	English
Article number	101601
Journal	Journal of Water Process Engineering
Volume	38
DOIs	https://doi.org/10.1016/j.jwpe.2020.101601
State	Published - Dec 2020

Keywords

Methylene blue
Pharmaceuticals
Photocatalysis
Polysulfone-alginate beads
TiO nanoparticles

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10.1016/j.jwpe.2020.101601

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title = "Constructing porous beads with modified polysulfone-alginate and TiO2 as a robust and recyclable photocatalyst for wastewater treatment",

abstract = "The availability of suitable support material for immobilizing photocatalyst, without loss of photoactivity, is a bottleneck for photocatalytic wastewater treatment in real-world applications. Here we report a facile method for the preparation and pore structure modification of highly stable and porous polymer composite consisting of polysulfone (PSF) and alginate (Alg) for immobilizing TiO2 nanoparticles. Compared to its constituents alone, this newly identified polymer composite has much higher stability as well as adsorption capacity towards the pollutant molecules, acting as an ideal matrix for immobilizing the photocatalyst. Various combinations of PSF, Alg, and TiO2 were tested in the form of beads, with the final ratio of 10:6:12, for the best adsorption and photodegradation capacity. With surface modification, these beads (denoted as PAT-12 M) showed superior photocatalytic activity toward methylene blue (MB) and the two pharmaceuticals – triclosan (TCS) and diclofenac (DCF), which were almost completely removed within 50, 40 and 120 min, respectively. The reactive oxygen species scavenging experiments confirmed the [rad]OH radicals played the primary role in photodegradation. The robustness of these beads allowed their use for at least 25 cycles under batch mode and 30 days in continuous mode with over 99% MB degradation. Thanks to the large size (3 mm) and excellent mechanical stability, these beads can be effortlessly dispersed in polluted solutions, in interswitchable suspended or floating form, and easily recovered. With these advantageous properties, PAT-12 M beads could be effectively employed for a wide range of applications at large scales.",

keywords = "Methylene blue, Pharmaceuticals, Photocatalysis, Polysulfone-alginate beads, TiO nanoparticles",

author = "Mehmood, {Ch Tahir} and Ziyi Zhong and Hua Zhou and Yeyuan Xiao",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

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AU - Mehmood, Ch Tahir

AU - Zhong, Ziyi

AU - Zhou, Hua

AU - Xiao, Yeyuan

PY - 2020/12

Y1 - 2020/12

N2 - The availability of suitable support material for immobilizing photocatalyst, without loss of photoactivity, is a bottleneck for photocatalytic wastewater treatment in real-world applications. Here we report a facile method for the preparation and pore structure modification of highly stable and porous polymer composite consisting of polysulfone (PSF) and alginate (Alg) for immobilizing TiO2 nanoparticles. Compared to its constituents alone, this newly identified polymer composite has much higher stability as well as adsorption capacity towards the pollutant molecules, acting as an ideal matrix for immobilizing the photocatalyst. Various combinations of PSF, Alg, and TiO2 were tested in the form of beads, with the final ratio of 10:6:12, for the best adsorption and photodegradation capacity. With surface modification, these beads (denoted as PAT-12 M) showed superior photocatalytic activity toward methylene blue (MB) and the two pharmaceuticals – triclosan (TCS) and diclofenac (DCF), which were almost completely removed within 50, 40 and 120 min, respectively. The reactive oxygen species scavenging experiments confirmed the [rad]OH radicals played the primary role in photodegradation. The robustness of these beads allowed their use for at least 25 cycles under batch mode and 30 days in continuous mode with over 99% MB degradation. Thanks to the large size (3 mm) and excellent mechanical stability, these beads can be effortlessly dispersed in polluted solutions, in interswitchable suspended or floating form, and easily recovered. With these advantageous properties, PAT-12 M beads could be effectively employed for a wide range of applications at large scales.

AB - The availability of suitable support material for immobilizing photocatalyst, without loss of photoactivity, is a bottleneck for photocatalytic wastewater treatment in real-world applications. Here we report a facile method for the preparation and pore structure modification of highly stable and porous polymer composite consisting of polysulfone (PSF) and alginate (Alg) for immobilizing TiO2 nanoparticles. Compared to its constituents alone, this newly identified polymer composite has much higher stability as well as adsorption capacity towards the pollutant molecules, acting as an ideal matrix for immobilizing the photocatalyst. Various combinations of PSF, Alg, and TiO2 were tested in the form of beads, with the final ratio of 10:6:12, for the best adsorption and photodegradation capacity. With surface modification, these beads (denoted as PAT-12 M) showed superior photocatalytic activity toward methylene blue (MB) and the two pharmaceuticals – triclosan (TCS) and diclofenac (DCF), which were almost completely removed within 50, 40 and 120 min, respectively. The reactive oxygen species scavenging experiments confirmed the [rad]OH radicals played the primary role in photodegradation. The robustness of these beads allowed their use for at least 25 cycles under batch mode and 30 days in continuous mode with over 99% MB degradation. Thanks to the large size (3 mm) and excellent mechanical stability, these beads can be effortlessly dispersed in polluted solutions, in interswitchable suspended or floating form, and easily recovered. With these advantageous properties, PAT-12 M beads could be effectively employed for a wide range of applications at large scales.

KW - Methylene blue

KW - Pharmaceuticals

KW - Photocatalysis

KW - Polysulfone-alginate beads

KW - TiO nanoparticles

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ER -

Constructing porous beads with modified polysulfone-alginate and TiO₂ as a robust and recyclable photocatalyst for wastewater treatment

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Keywords

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