Studies on Photodegradation Kinetics of Rhodamine B by Titanium Dioxide - Carbon Composite Materials

Abstract

The composite materials were prepared with high-viscosity clay as carrier, activated carbon as adsorbent, and titanium dioxide as photocatalyst.Kinetic process of photocatalytic degradation of rhodamine B was investigated at different reaction conditions using the composite materials.The results shown that : rhodamine B was the maximum catalytic activity when the initial reaction solution concentration is 5mg/L,pH=6,and composite material dosing quantity is 5g/L.The kinetics of photocatalytic degradation reaction can be expressed by the first-order reaction kinetic model.

Functionalized Activated Carbon Derived from Biomass for Photocatalysis Applications Perspective

“…The organic pollutants are supposed to be small to be adsorbed in microspores. In most of the AC amounts, a large group of micropores exists over the broad surface of the substantial pores, mesopores, and macropores; a large amount of toxic particles is well balanced due to physical adsorption [247][248][249][250]. Instead, only a little number of pollutant particles are adsorbed on the surface of TiO 2 .…”

“…Though these radicals will take birth over the surface of TiO 2 molecules and they are in the access of ultraviolet radiations and do not locate on the surface in the same radicals, they cannot diffuse through long distances and are limited to an area close to the active centers in TiO 2 [231][232][233][234][235]251] (Figure 9). Adsorbed pollutant particles are photocatalytically demoted; they have to move along the surface of AC and TiO 2 molecules with the surface are not necessarily interacted to ultraviolet radiations [249].…”