Characterization and Optimization of Photocatalytic Activity of Sol Gel-Synthesized TiO2 and Ag-doped TiO2 through Degradation of Synthetic Textile Effluent by UV Lamp-Assisted Experimental Setup

Abstract

The textile industry is one of the largest producers of harmful effluent, and this has become a serious threat to the environment when disposed of into water bodies, which may lead to high pollution risk -especially in developing countries. There are several treatment methods ranging from conventional to advanced for treating textile effluent before disposal in the environment. Photocatalytic oxidation (AOPs) is the most sophisticated process among all other advanced oxidation processes. In this study, TiO 2 and Ag-doped TiO2 were used for the photcatalytic degradation of synthetic textile effluent. TiO 2 and Ag-doped TiO 2 catalyst were synthesized through two routes of sol-gel method (M1 and M2 reported in our previous study) for mobilized and immobilized utilization purposes [1], and characterization of the catalysts was carried out through X-ray diffrectrometric analysis. XRD patterns showed that catalysts synthesized by both routs of sol-gel method were initially found in amorphous form as no peak appeared in an X-ray diffractrogram at 0ºC calcination (catalyst without calcinations), whereas with an increase of temperature the amorphous form of catalyst turned into crystalline. Results showed that TiO 2 synthesized by the sol-gel route showed anatase phase at 350ºC, and peaks kept growing until 550ºC. Furthermore, at 650-750ºC anatase and rutile co-exist, while in Ag-doped TiO 2 , anatase appeared at 350-450ºC and at 550ºC anatase phase/silver co-existed, whereas at 650-750ºC anatse-silver-rutile co-existed. An X-ray diffractrogram showed that catalyst synthesized through the 2 nd sol-gel route also possessed an amorphous nature at 350ºC and peaks of anatase phase of TiO 2 appeared at 450ºC and kept growing sharper as temperature increased from 450-750ºC, whereas anatase peaks detected at 350ºC in Ag-TiO 2 , and anatase-silver co-existed at 450ºC and 550ºC. Hence, anatase disappeared *

Continuous Tubular Photoreactor with TiO2 Nanoparticles Catalyst for Batik Industrial Wastewater Treatment

“…• Efficiency: 94.29% (COD) and 98.44% (Color), for the immobilized catalyst [37] • Characteristics: continuous type of reactor which is named CS4PR and built using a glass vessel • Efficiency: 85%; 49% and 96% [39] Table 2.…”