TY - JOUR
T1 - Role of self-assembly coated Er3+
T2 - YAlO3/TiO2 in intimate coupling of visible-light-responsive photocatalysis and biodegradation reactions
AU - Dong, Shanshan
AU - Dong, Shuangshi
AU - Tian, Xiadi
AU - Xu, Zhengxue
AU - Ma, Dongmei
AU - Cui, Bin
AU - Ren, Nanqi
AU - Rittmann, Bruce
N1 - Funding Information:
The authors greatly thank the financial supporting of Open Project of State Key Laboratory of Urban Water Resource and Environment ( QA201418 ), HIT, China and State Key Laboratory of Urban Water Resource and Environment ( 20140101159JC ).
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2016/1/25
Y1 - 2016/1/25
N2 - Conventionally used ultraviolet light can result in dissolved organic carbon (DOC) increasing and biofilm damage in intimate coupling of photocatalysis and biodegradation (ICPB). Visible-light-responsive photocatalysis offers an alternative for achieving ICPB. In this study, composite-cubes were developed using self-assembly to coat a thin and even layer of visible-light-responsive photocatalyst (Er3+: YAlO3/TiO2) on sponge-type carriers, followed by biofilm cultivation. The degradations of phenol (50mgL-1) were compared for four protocols in circulating beds: adsorption (AD), visible-light-responsive photocatalysis (VPC), biodegradation (B), and intimately coupled visible-light-responsive photocatalysis and biodegradation (VPCB). The phenol and DOC removal efficiencies using VPCB in 16h were 99.8% and 65.2%, respectively, i.e., higher than those achieved using VPC (71.6% and 50.0%) or B (99.4% and 58.2%). The phenol removal of 96.3% could be obtained even after 3 additional cycles. The 6.17-min intermediate detected by HPLC, continuously accumulated for VPC, appeared at 1-6h and then was completely removed for VPCB in 10h. ICPB was further illustrated in that most of the biofilm was protected in the carrier interiors, with less protection on the carrier exterior in VPCB. A self-regulation mechanism that helped photocatalyst exposure to visible-light irradiation was identified, promoting the combined photocatalysis and biodegradation.
AB - Conventionally used ultraviolet light can result in dissolved organic carbon (DOC) increasing and biofilm damage in intimate coupling of photocatalysis and biodegradation (ICPB). Visible-light-responsive photocatalysis offers an alternative for achieving ICPB. In this study, composite-cubes were developed using self-assembly to coat a thin and even layer of visible-light-responsive photocatalyst (Er3+: YAlO3/TiO2) on sponge-type carriers, followed by biofilm cultivation. The degradations of phenol (50mgL-1) were compared for four protocols in circulating beds: adsorption (AD), visible-light-responsive photocatalysis (VPC), biodegradation (B), and intimately coupled visible-light-responsive photocatalysis and biodegradation (VPCB). The phenol and DOC removal efficiencies using VPCB in 16h were 99.8% and 65.2%, respectively, i.e., higher than those achieved using VPC (71.6% and 50.0%) or B (99.4% and 58.2%). The phenol removal of 96.3% could be obtained even after 3 additional cycles. The 6.17-min intermediate detected by HPLC, continuously accumulated for VPC, appeared at 1-6h and then was completely removed for VPCB in 10h. ICPB was further illustrated in that most of the biofilm was protected in the carrier interiors, with less protection on the carrier exterior in VPCB. A self-regulation mechanism that helped photocatalyst exposure to visible-light irradiation was identified, promoting the combined photocatalysis and biodegradation.
KW - Intimate coupling
KW - Phenol
KW - Self-assembly
KW - Self-regulation mechanism
KW - Visible-light-responsive photocatalysis
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U2 - 10.1016/j.jhazmat.2015.10.007
DO - 10.1016/j.jhazmat.2015.10.007
M3 - Article
C2 - 26489913
AN - SCOPUS:84944710305
SN - 0304-3894
VL - 302
SP - 386
EP - 394
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -