Immobilizing a visible light-responsive photocatalyst on a recyclable polymeric composite for floating and suspended applications in water treatment

TY - JOUR

T1 - Immobilizing a visible light-responsive photocatalyst on a recyclable polymeric composite for floating and suspended applications in water treatment

AU - Mehmood, Ch Tahir

AU - Zhong, Ziyi

AU - Zhou, Hua

AU - Zhang, Chenchen

AU - Xiao, Yeyuan

N1 - Publisher Copyright: © The Royal Society of Chemistry.

PY - 2020/10/1

Y1 - 2020/10/1

N2 - A visible light responsive TiO2/Ag3PO4 (10 : 1) nanocomposite was prepared and successfully immobilized (12 wt%) in a spherical polymeric matrix consisting of polysulfone and alginate (10 : 6). The resulted beads featured a sponge-like structure with interconnected macrovoids and micropores, and showed high adsorption and visible-light photocatalytic activity towards various wastewater pollutants, including the widely used dye-methylene blue (k = 0.0321 min-1), and two emerging pharmaceutical contaminants-diclofenac (k = 0.018 min-1) and triclosan (k = 0.052 min-1). As determined, the OH radical and h+ are the primary reactive oxygen species responsible for the photodegradation. The composite photocatalytic beads are also effective in bacterial inactivation and degradation of acyl-homoserine lactones (AHLs), the bacterial quorum sensing autoinducers triggering biofilms, thus exhibiting a promising future in wastewater disinfection and biofilm retardation. Additionally, these beads could be used in inter-switchable suspended or buoyant forms, and be effectively regenerated by H2O2 treatment, and used for multiple cycles without any significant loss in photoactivity. With these unique features, the prepared visible-light photocatalytic beads could be easily applied in large-scale water and wastewater treatment systems.

AB - A visible light responsive TiO2/Ag3PO4 (10 : 1) nanocomposite was prepared and successfully immobilized (12 wt%) in a spherical polymeric matrix consisting of polysulfone and alginate (10 : 6). The resulted beads featured a sponge-like structure with interconnected macrovoids and micropores, and showed high adsorption and visible-light photocatalytic activity towards various wastewater pollutants, including the widely used dye-methylene blue (k = 0.0321 min-1), and two emerging pharmaceutical contaminants-diclofenac (k = 0.018 min-1) and triclosan (k = 0.052 min-1). As determined, the OH radical and h+ are the primary reactive oxygen species responsible for the photodegradation. The composite photocatalytic beads are also effective in bacterial inactivation and degradation of acyl-homoserine lactones (AHLs), the bacterial quorum sensing autoinducers triggering biofilms, thus exhibiting a promising future in wastewater disinfection and biofilm retardation. Additionally, these beads could be used in inter-switchable suspended or buoyant forms, and be effectively regenerated by H2O2 treatment, and used for multiple cycles without any significant loss in photoactivity. With these unique features, the prepared visible-light photocatalytic beads could be easily applied in large-scale water and wastewater treatment systems.

UR - http://www.scopus.com/inward/record.url?scp=85093094160&partnerID=8YFLogxK

U2 - 10.1039/d0ra06864k

DO - 10.1039/d0ra06864k

M3 - 文章

AN - SCOPUS:85093094160

SN - 2046-2069

VL - 10

SP - 36349

EP - 36362

JO - RSC Advances

JF - RSC Advances

IS - 60

ER -