Clinical wastewater treatment: Photochemical removal of an anionic antibiotic (ciprofloxacin) by mesostructured high aspect ratio ZnO nanotubes

Mesostructured ZnO/Au nanoparticle composites with enhanced photocatalytic activity

“…[31] The reduced performance of ZnO/Au_15 and ZnO/Au_26 also indicates that thermal effects due to the strong localized surface plasmon resonance absorption of Au NPs can be neglected, as in this case a higher activity would be expected for composites with higher Au contents. In comparison to previous studies on the degradation of ciprofloxacin with neat ZnO nanotubes, [30] the ZnO/Au_12 composite material shows a ca. 40% improved performance, as with the ZnO nanotubes a conversion of only 12% could be achieved under identical reaction conditions (Fig.…”

“…Details on the synthesis and characterization of the used monodisperse ZnO NPs can be found elsewhere. [30] To investigate the effect of the Au content on the photocatalytic degradation of antibiotics (ciprofloxacin and levofloxacin), four different ZnO/Au hybrid materials (8 , 12 , 15 and 26 wt-% Au with respect to the overall amount of inorganic material in the hybrid) were synthesized. The notation ZnO/Au_x, with x denoting the Au content in wt-%, will be used in the following.…”

“…[28,29] The resulting nonwoven structures provide sufficient mechanical stability to be used in continuous flow cells, while at the same time offering a high accessible surface area. [30] Herein, we report the synthesis of mesostructured ZnO/Au NP composites for the efficient detoxification of hospital wastewater, exemplified on the photocatalytic degradation of ciprofloxacin and levofloxacin. To this end, cationic CPBs, consisting of a cross-linked polybutadiene (PB) core and a quaternized poly(2-vinylpyridine) (P2VP) corona, were used as template for the simultaneous mesostructuring of ZnO and Au NPs.…”

Construction of stable core–shell imprinted Ag-(poly-o-phenylenediamine)/CoFe2O4 photocatalyst endowed with the specific recognition capability for selective photodegradation of ciprofloxacin

“…[10][11][12][13] In this context, photocatalysis, as a green technology which uses light energy and degrades pollutants to non-toxic harmless substances, has aroused great interest among many researchers. [14][15][16][17][18] Recently, TiO 2 , CdS, ZnO and other materials have been extensively studied and widely used as photocatalysts. [19][20][21][22][23] They each have their respective advantages; however, their common shortcomings are also evident, such as poor selectivity, namely, these common photocatalysts cannot selectively remove specic pollutants in the presence of other pollutants.…”

Synthesis of ZnO photocatalyst modified with activated carbon for a perfect degradation of ciprofloxacin and its secondary pollutants

“…In other words, CIP has two ionizable functional groups including 6‐carboxylic group and the N 4 of the piperazine substituent. A carboxylic acid has more acidity power than the ammonium group, since pKa 1 is related to deprotonation of carboxyl group while pKa 2 is that of N 4 in the piperazinyl group . Then, at pH < 6.09 the surface of CIP is positively charged and at pH > 6.09, negatively charged.…”