Removal of Crotamiton from Reverse Osmosis Concentrate by a TiO2/Zeolite Composite Sheet

Reverse osmosis (RO) concentrate from wastewater reuse facilities contains concentrated emerging pollutants, such as pharmaceuticals. In this research, a paper-like composite sheet consisting of titanium dioxide (TiO2) and zeolite was synthesized, and removal of the antipruritic agent crotamiton fro...

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Bibliographic Details
Published in:Applied sciences 2017-07, Vol.7 (8), p.778
Main Authors: Xiang, Qun, Fukahori, Shuji, Yamashita, Naoyuki, Tanaka, Hiroaki, Fujiwara, Taku
Format: Article
Language:English
Subjects:
Adsorption
Drugs
Feasibility studies
Immobilization
inhibitory effect
intermediate
Intermediates
Irradiation
Oxidation
paper-like composite sheet
pharmaceutical
Photocatalysis
Pollutants
Reclamation
Reverse osmosis
reverse osmosis concentrate
Titanium dioxide
Ultraviolet radiation
Wastewater
Wastewater reuse
Water pollution
Water purification
zeolite
Zeolites
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Summary:Reverse osmosis (RO) concentrate from wastewater reuse facilities contains concentrated emerging pollutants, such as pharmaceuticals. In this research, a paper-like composite sheet consisting of titanium dioxide (TiO2) and zeolite was synthesized, and removal of the antipruritic agent crotamiton from RO concentrate was studied using the TiO2/zeolite composite sheet. The RO concentrate was obtained from a pilot-scale municipal secondary effluent reclamation plant. Effective immobilization of the two powders in the sheet made it easy to handle and to separate the photocatalyst and adsorbent from purified water. The TiO2/zeolite composite sheet showed excellent performance for crotamiton adsorption without obvious inhibition by other components in the RO concentrate. With ultraviolet irradiation, crotamiton was simultaneously removed through adsorption and photocatalysis. The photocatalytic decomposition of crotamiton in the RO concentrate was significantly inhibited by the water matrix at high initial crotamiton concentrations, whereas rapid decomposition was achieved at low initial crotamiton concentrations. The major degradation intermediates were also adsorbed by the composite sheet. This result provides a promising method of mitigating secondary pollution caused by the harmful intermediates produced during advanced oxidation processes. The cyclic use of the HSZ-385/P25 composite sheet indicated the feasibility of continuously removing crotamiton from RO concentrate.
ISSN:2076-3417
2076-3417
DOI:10.3390/app7080778