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XRD spectra of: (a) pure titanium dioxide, (b) cobalt-doped-titanium dioxide, (c) nickel-doped titanium dioxide, and (d) zinc-doped titanium dioxide.
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Dyes being a major pollutant of water worldwide needs special attention to be effectively degraded. The photochemical technique among the applied treatment methods is considered to be the most
valuable technique involving oxidative degradation processes. In this study catalytic oxidation of toluidine blue and methyl orange dyes was studied under UV...
Contexts in source publication
Context 1
... diffraction (XRD) pattern of un-doped and doped titanium dioxide is shown in Fig. 2. Strong diffraction peaks at 2θ = 25.3°, 37.2°, 47.4°, 53.3°, and 62.4° are exhibited by titanium dioxide. All the peaks were comparable to the standard spectrum. It is clear from Fig. 2 that all the samples show the anatase phase regardless of the metal content. XRD patterns of metal-doped titanium dioxide samples do not exhibit any ...
Context 2
... diffraction (XRD) pattern of un-doped and doped titanium dioxide is shown in Fig. 2. Strong diffraction peaks at 2θ = 25.3°, 37.2°, 47.4°, 53.3°, and 62.4° are exhibited by titanium dioxide. All the peaks were comparable to the standard spectrum. It is clear from Fig. 2 that all the samples show the anatase phase regardless of the metal content. XRD patterns of metal-doped titanium dioxide samples do not exhibit any diffraction peaks of metals. This is probably due to low metal ions doping contents 1% and also the metals are well dispersed within the titanium crystal phase ...
Citations
... Recent works on the subject are virtually countless, indeed, and are periodically reviewed [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][54][55][56]. Plenty of papers make a claim for very satisfactory (>90%) [10,[57][58][59] or even almost complete (>97%) [60][61][62][63][64][65] apparent removal of all the substrates considered herein. Again, it is important to stress that, unlike most reports, our data take into account the correction for the amount of undegraded substrate possibly adsorbed onto the photoactive material. ...
Some composite materials have been prepared, constituted by a cyclodextrin-bis-urethane-based nanosponge matrix in which a reduced graphene oxide/silver nanoparticles photocatalyst has been dispersed. Different chain extenders were employed for designing the nanosponge supports, in such a way as to decorate their hyper-cross-linked structure with diverse functionalities. Moreover, two different strategies were explored to accomplish the silver loading. The obtained systems were successfully tested as catalysts for the photodegradation of emerging pollutants such as model dyes and drugs. Enhancement of the photoactive species performance (up to nine times), due to the synergistic local concentration effect exerted by the nanosponge, could be assessed. Overall, the best performances were shown by polyamine-decorated materials, which were able to promote the degradation of some particularly resistant drugs. Some methodological issues pertaining to data collection are also addressed.
Dyes as one of the majority critical environmental pollutants from industrial wastewaters, have caused many concerns for researchers. In this research an effective photocatalyst based on La2O3-SiO2 nanocomposite was prepared and evaluated for degradation of toluidine blue (TB) dye. The prepared photocatalyst was illustrated impressive performance in degradation of TB equal to 97% by visible light irritation. Accuracy of synthesized nanocomposite was studied by some technics including FE-SEM, FT-IR, EDX and mapping analysis. Also the effective parameters in degradation percent of TB such as pH, temperature, time, concentration and the amount of nanocomposite were investigated and optimized equal to amounts of 8.0, 25℃, 80 min, 3.0 µg/mL and 0.04 mg respectively.
Advanced oxidation processes (AOPs) have been used as an alternative and effective option for treatment of wastewaters especially in case of non-biodegradable compounds. It is well known that bismuth vanadate shows photocatalytic activity. In the present work, bismuth vanadate-MWCNT composite was used for degradation of toluidine blue. The degradation was monitored spectrophotometrically. Effect of different operational parameters like pH, concentration, amount of composite, light intensity, etc. was studied on the rate of degradation. A suitable mechanism for the photocatalytic degradation of toluidine blue dye has been proposed. It is an eco-friendly method for the treatment of polluted water. The catalyst can be recycled and used again.
