Solar light efficient photocatalytic activity degradation of emergent contaminants by coated TiO₂ nanoparticles

Abstract

The photocatalytic degradation of different emergent contaminants in aqueous solutions has been studied by using oligomer-coated TiO2 nanoparticles under solar light irradiation.

Dual adsorbent-photocatalytic keratin–TiO2 nanocomposite for trimethoprim removal from wastewater

“…They were assigned to the stretching vi bra tions of the O-H (3322 cm -1 ) a nd the bending vi brations of the a ds orbed water molecules, (1605 cm -1 ). 39,40 In the hydrogel spectra kera tin characteristic bands could be found: peaks were observed a t 1636 cm −1 , whi ch corresponded to the vi bration of the C=O bond (Ami de I band), and a t 1524 cm −1 , which corresponded to a combi nation of the C-N s tretching and N-H deformation vi brations (Ami de II) 9 . The lack of TiO2 related bands may be due to the low concentration of the nanoparticles a nd the l ow infrared a bsorption of the Ti O2 groups.…”

“…57 The photoluminescence emission spectrum of the TiO2 was reported in a previ ous s tudy of the group. 9 The l uminescence spectrum of TiO2 obta ined using a n excitation wavelength of 320 nm exhibits one ma i n emission peaks a t 375 nm. The emission band a t 375 nm was due to the direct band to band transitions.…”

“…The a pparent fi rst-order kinetic model that was derived from the La ngmuir-Hinshelwood kinetic equation was used in this study to determine the photocatalyti c degradability of the tri methoprim and was described i n the Supplementary Information. 9 The a pparent fi rs t-order ra te constant (kapp in h -1 ), equivalent to the slope of the l i near regression was applied to evaluate the photocatalytic degra dation ra tes of K-Ti O2 10%. In Figure S8 (Supplementary Informationn) the plotting l n C0/C a s a function of reaction time yi el ded a straight line for the s econd cycl e demonstrating that the degra dation follows the a pparent fi rst-order kinetic law a nd confi rming trimethoprim decomposition due to photocatalysis.…”

“…[5][6][7] In this context, the development of economical and efficient advanced water treatment technologies is cruci a lly needed. In recent years, a dvanced oxidation technologies (AOT), i ncluding photocatalytic degradation in heterogeneous phase, became a ttra cti ve and i mportant as they have great potential to contribute to wa s tewater remediation [8][9][10] . The photocatalyti c process can compl etely mineralize organic compounds to wa ter, carbon dioxide a nd other inorganic compounds without causing secondary conta mination.…”

“…One of the most i mportant aspects of photocatalysis is the s election of materials. Semi conductors s uch as TiO2 a re usually used a s a photocatalys t in the l i terature, since they a re relatively i nexpensive and highly effective 9,15,16 . The photocatalytic a ctivi ty of TiO2 depends on s everal parameters, such as the crys tal forms, percent crys tallinity, dopi ng materials, surface a rea, and the density of s urface h ydroxyl groups.…”