Abstract
Immobilization of photocatalysts in porous materials is an approach to significantly minimize the hazards of manipulation and recovery of nanoparticles. Inorganic materials, such as zeolites, are proposed as promising materials for photocatalyst immobilization mainly due to their photochemical stability. In this work, a green synthesis method is proposed to combine TiO2-based photocatalysts with commercial ZY zeolite. Moreover, a preliminary analysis of their performance as photocatalysts for the abatement of organic pollutants in waters was performed. Our results show that the physical mixture of TiO2 and zeolite maintains photocatalytic activity. Meanwhile, composites fabricated by doping TiO2–zeolite Y materials with silver and palladium nanoparticles do not contribute to improving the photocatalytic activity beyond that of TiO2.
Highlights
The global water demand is expected to grow about 20–30% by 2050 compared to the demand in 2010 [1,2]
While ozone and hydrogen peroxide require a continuous supply of the oxidant agent as it is consumed during the water treatment, semiconductor-based Advanced oxidation processes (AOPs) need no additional chemicals
Wodka et al [27] found that TiO2 –P25 and TiO2 –Ag composites presented, respectively, 1.5 and 2.4 times higher photoactivity for oxalic acid than for humic acid, as the results reported in the present study for dimensionless concentration ofofdichloroacetic acid (DCA) and SDBS solutions
Summary
The global water demand is expected to grow about 20–30% by 2050 compared to the demand in 2010 [1,2]. Hydrogen peroxide and ultraviolet (UV) irradiation, either individually or combined, are typically used in commercialized systems Several other materials, such as Fe2+ , Mn3+ , and semiconductors, are studied to promote the degradation of organics in water [9,10]. While ozone and hydrogen peroxide require a continuous supply of the oxidant agent as it is consumed during the water treatment, semiconductor-based AOPs need no additional chemicals. Combining TiO2 and zeolites was reported to enhance the degradation of organics in water [14,15]. While polymer dense membranes are still the only type of membranes accomplishing sufficient rejection of small molecular weight compounds, polymers are highly sensitive to radical oxidation Their protection by a photocatalytic inorganic (i.e., ceramic) layer was already proposed in the literature [22]. The new photocatalytic materials were evaluated with several organic molecules of different nature
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