TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

Abstract

2-methylisoborneol (2-MIB) is a common taste and odor compound caused by off-flavor secondary metabolites, which represents one of the greatest challenges for drinking water utilities worldwide. A TiO2-coated activated carbon (TiO2/PAC) has been synthesized using the sol-gel method. A new TiO2/PAC photocatalyst has been successfully employed in photodegradation of 2-MIB under UV light irradiation. In addition, the combined results of XRD, SEM-EDX, FTIR and UV-Vis suggested that the nano-TiO2 had been successfully loaded on the surface of PAC. Experimental results of 2-MIB removal indicated that the adsorption capacities of PAC for 2-MIB were higher than that of TiO2/PAC. However, in the natural organic matter (NOM) bearing water, the removal efficiency of 2-MIB by TiO2/PAC and PAC were 97.8% and 65.4%, respectively, under UV light irradiation. Moreover, it was shown that the presence of NOMs had a distinct effect on the removal of MIB by TiO2/PAC and PAC. In addition, a simplified equivalent background compound (SEBC) model could not only be used to describe the competitive adsorption of MIB and NOM, but also represent the photocatalytic process. In comparison to other related studies, there are a few novel composite photocatalysts that could efficiently and rapidly remove MIB by the combination of adsorption and photocatalysis.

Enhanced Ponceau‐4R and Brilliant Blue Degradation using Mesoporous TiO2 Nanoparticles with Activated Carbon as Support Material

“…Figure 2(a) shows the qualitative analysis of the surface functional groups of AC samples to investigate the interaction between AC and TiO 2 based on the recorded FTIR spectra. Referring to the absorption bands, we noticed (a) at 3,486 cm À 1 , the OÀ H stretching of the hydroxyl group was likely due to the absorbed moisture, [36] (b) at 2,936 cm À 1 , the carbon-hydrogen interaction stretching was because of CÀ H groups, [37] (c) at 1,644 and 1,452 cm À 1 , the carbon-hydrogen interaction stretching was because of CH 2 and CH 3 deformation, [38] (d) at 1,622 cm À 1 , the peak was likely due to the elongation of titanium carboxylate from the by-product of TTIP and ethanol used in the sol-gel-mediated synthesis process, [39] (e) at 1,056 cm À 1 , the ring vibration in an aromatic compound was mainly present in carbonaceous materials like AC, [40] (f) at 812 cm À 1 , the peak represents the stretching of the TiÀ OÀ Ti bond, matching the characteristic attribute of the formation of TiO 2 particles, [41] and (g) at 484 cm À 1 , the TiÀ OÀ Ti stretching vibration reflects the characteristic of the TiO 2 crystal structure. [42] We also observed several other peaks at different wavenumbers for the prepared AC/TiO 2 composites.…”

Coconut Fiber Decorated with Bismuth Vanadate for Enhanced Photocatalytic Activity

“…This result corresponds with the finding of Guo et al 29 The result was investigated by modifying TiO 2 on powdered activated carbon (TiO 2 /PAC) for 2-methylisoborneol (2-MIB) waste treatment. The decolorizations of such a pollutant collected from a river were obtained with adsorption experiments, followed by photodegradation experiments under UV light.…”

TiO2/Karaya Composite for Photoinactivation of Bacteria

“…The diffraction peaks at 25• , 38• , 48 • , 54• , 55• , 63• , 69•, and 70 • , indexed to the (101), (004), (200), (105), (211), (204), (116), and (220) planes, respectively, belonged to the anatase phase of TiO 2 and were identified by the Crystallographic Open Database (reference code: 96-101-0943), while the emerging peak at 31 • was associated with the brookite (121) phase (reference code: 96-900-4138). For the compound synthesized from natural reagents with a calcination temperature of 400 • , the XRD pattern suggested the formation of a crystalline structure due to the narrow and well-defined peaks' presence[32][33][34][35][36]. Using the Williamson and Hall equation, the average crystallite size (D) and lattice strain (ε) were calculated for the majority anatase phase.…”