Enhancement of Photocatalytic Efficiency of TiO₂ by Supporting on Clinoptilolite in the Decolorization of Azo Dye Direct Yellow 12 Aqueous Solutions

Abstract

Structure and physico-chemical properties of a photocatalyst, especially surface area and absorption ability, were correlated to catalytic activities in photodegradation of dye pollutants in water. In this investigation photocatalytic degradation of azo dye Direct yellow 12 (Chrysophenine G) in water was studied. Titanium(IV) oxide was supported on Clinoptilolite (CP) (Iranian Natural Zeolite) using solid-state dispersion (SSD) method. The results show that the TiO 2 /Clinoptilolite (SSD) is an active photocatalyst. The maximum effect of photo degradation was observed at 10 wt.% TiO 2 , 90 wt.% Clinoptilolite. A first order reaction with k = 0.0108 min -1 was observed. The effects of some parameters such as pH, amount of photocatalyst, initial concentration of dye were examined.

Removal of Emerging Organic Pollutants by Zeolite Mineral (Clinoptilolite) Composite Photocatalysts in Drinking Water and Watershed Water

“…Apart from the characteristics of semiconductor catalysts and supports, the synthesis method also has a significant influence on the composition and photocatalytic activity of the obtained composite photocatalysts. Up until now, multiple synthetic routes have been carried out to prepare semiconductor-based photocatalysts supported by CP such as hydrothermal [100], photochemical reduction [101], TiCl 4 hydrolysis [102], sol-gel [103], ion exchange [104], physical mixing [105], and SSD [106]. Herein, different methods to prepare TiO 2 /CP composites and their photocatalytic efficiencies in decomposing pollutants are summarized in Table 2, and typical synthetic methods are introduced as follows in detail.…”

“…The massive emission of wastewater containing TC antibiotics caused a serious threat to the environment, ecosystem, and public health owing to their degradation resistance, long half-life, and poor metabolism [129,130]. An Ag/g-C3N4/CP composite with high photoactivity was prepared by ultrasound energy and was used to remove the TC under simulated solar light irradiation [106]. DRS analysis demonstrated that the deposition of Ag NPs could improve the absorption intensity in the simulated solar light region owing to the surface plasmon resonance, and decrease the bandgap resulting in more solar spectrum utilization.…”

Adsorption of Strontium from an Aqueous Solution by TiO2-Pillared Zeolite

“…The mixture was then dried at 120°C for 5 h in a drying oven and calcined in a furnace at 500°C for 5 h. Then, the obtained TiO2-pillared zeolite was characterized using SEM, XRD, and FTIR spectroscopy. According to Nikazar et al (2007), the proposed incorporation of TiO2 into the zeolite is as shown in Figure 1. (Nikazar et al, 2007)…”

“…According to Nikazar et al (2007), the proposed incorporation of TiO2 into the zeolite is as shown in Figure 1. (Nikazar et al, 2007)…”