Enhanced photocatalytic activity of nickel oxide supported on clinoptilolite nanoparticles for the photodegradation of aqueous cephalexin

Kinetic Adsorption Study of Silver Nanoparticles on Natural Zeolite: Experimental and Theoretical Models

“…These minerals present a great porosity and a significant cation-exchange capacity [1,2]. Because of this, natural zeolites offer a wide range of applications, and one of the most notable is the removal of contaminant ions in water and soil [3][4][5]. It is reported that natural zeolites, specifically clinoptilolite, have been used in the removal of Mn, Cu, Ar, Pd, Cd, and Zn [4][5][6].…”

“…Because of this, natural zeolites offer a wide range of applications, and one of the most notable is the removal of contaminant ions in water and soil [3][4][5]. It is reported that natural zeolites, specifically clinoptilolite, have been used in the removal of Mn, Cu, Ar, Pd, Cd, and Zn [4][5][6]. However, it is important to study the rate of adsorption of these species, in order to provide the optimum conditions for the adsorption process.…”

As-synthesized ZSM-5 zeolite as a suitable support for increasing the photoactivity of semiconductors in a typical photodegradation process

“…Many authors [18,30] have confirmed that the reaction rate of a photocatalytic degradation depends to the catalyst dosage. Hence, a series of experiments were carried out to assess the optimum catalyst dosage by varying the amount of the catalyst from 0.2 to 1.0 g L À 1 as suspension in a 20 mg L À 1 MG solution.…”

“…This prevents from aggregation of NiO particles and hence provides more accessible active sites for absorption of arrived photons. In other point of view, the photoxcited electrons in conductance band of NiO can distribute into the zeolite network hence prevent to recombination of electron-hole pairs [30]. This in turn leads to increase in the photodegradation efficiency.…”

“…Thus, they decrease the number of active sites on the surface. Light scattering by the particles and the increase in opacity may be other reason for the decrease in the degradation rate [30].…”