Photocatalytic Degradation of Nitro and Chlorophenols Using Doped and Undoped Titanium Dioxide Nanoparticles

Abstract

Pure and Ag-TiO2nanoparticles were synthesized, with the metallic doping being done using the Liquid Impregnation (LI) method. The resulting nanoparticles were characterized by analytical methods such as scanning electron micrographs (SEMs), Energy Dispersive Spectroscopy (EDS), and X-ray diffraction (XRD). XRD analysis indicated that the crystallite size ofTiO2was 27 nm to 42 nm while the crystallite size of Ag-TiO2was 11.27 nm to 42.52 nm. The photocatalytic activity of pureTiO2and silver dopedTiO2was tested by photocatalytic degradation ofp-nitrophenol as a model compound. Ag-TiO2nanoparticles exhibited better results (98% degradation) as compared to pureTiO2nanoparticles (83% degradation) in 1 hour for the degradation ofp-nitrophenol. Ag-TiO2was further used for the photocatalytic degradation of 2,4-dichlorphenol (99% degradation), 2,5-dichlorophenol (98% degradation), and 2,4,6-trichlorophenol (96% degradation) in 1 hour. The degree of mineralization was tested by TOC experiment indicating that 2,4-DCP was completely mineralized, while 2,5-DCP was mineralized upto 95 percent and 2,4,6-TCP upto 86 percent within a period of 2 hours.

Bisphenol A Removal through Low-Cost Kaolin-Based Ag@TiO2 Photocatalytic Hollow Fiber Membrane from the Liquid Media under Visible Light Irradiation

“…The aggregation amplified with increasing the concentration of Ag loading from 0.5 g to 1.4 g, as confirmed by EDX analysis. The aggregation is more prominent in the P-4 (1.4 g Ag@TiO 2 ) sample, and this may tremendously reduce the band gap of TiO 2 and consequently improved photocatalytic removal efficiency [23]. The EDX analysis of P-4 (Figure 2) demonstrated that Ag is not uniformly dispersed on the surface of TiO 2 , which is in accordance with previous works [24,25].…”

PREPARAÇÃO DE NANOCOMPÓSITOS DE DIÓXIDO DE TITÂNIO COM PRATA (Ag/TiO2) PARA FOTODEGRADAÇÃO E DIMENSIONAMENTO DE UM REATOR BATELADA

“…As imagens obtidas por MEV evidenciam aglomerados de escala micrométrica e pequenas partículas pontuais na escala nanométrica, conforme observado na Figura 2. De acordo com Ilyas et al, (2011), infere-se que os pequenos pontos esféricos isolados na Figura 2-b são nanopartículas de TiO2, e as partículas em formato filamentoso correspondem à prata. Conforme mostra a Figura 3, a análise do EDS reafirma a composição do nanocompósito, uma vez que titânio, oxigênio e prata estão presentes com uma porcentagem mássica coerente, em relação às massas de AgNO3 e TiO2 utilizadas no processo de dopagem.…”

Investigation of photocatalytic activity of pure strontium hydroxyapatite and its Ti-substituted and TiO2 loaded forms

“…WanJum et al reported enhanced photodegradation of Cu-porphyrin modified TiO 2 (13.9 ppm of p-nitrophenol in 66 mins) [39]. Ilyas et al have reported better catalytic activity for the degradation of p-nitrophenol (4 ppm) using Ag-doped TiO 2 under UV irradiation (98%) compared to that of pure TiO 2 (83%) in 1 h [40]. Photodegradation using surface modified TiO 2 with salicylic acid resulted in 91.1% of degradation of 1 ppm of p-nitrophenol in 180 mins [28].…”