Synthesis of iron-doped TiO2 for degradation of reactive Orange16

Abstract

In this study the optimum conditions for preparing the iron-doped TiO2 nanoparticles were investigated. Samples were synthesized by sol–gel impregnation method. Three effective parameters were optimized using Taguchi method, consisted of: (i) atomic ratios of Fe to Ti; (ii) sintering temperature; (iii) sintering time. The characterization of samples was determined using X-ray diffraction, BET- specific surface area, UV- Vis reflectance spectra (DRS) and scanning electron microscope (SEM). The XRD patterns of the samples indicated the existence of anatase crystal phase in structure. UV- Vis reflectance spectra showed an enhancement in light absorbance in the visible region (wavelength > 400 nm) for iron-doped samples. The photocatalytic activity of samples was investigated by the degradation of RO 16 (RO 16) dye under UV irradiation. The results illustrated that the photocatalytic activity of iron-doped TiO2 was more than pure TiO2, because of the smaller crystal size, grater BET surface area and higher light absorption ability.

Removal of Cd(II) ion from wastewater by adsorption onto treated old newspaper: kinetic modeling and isotherm studies

“…The development of economy and industrialization, caused water contamination especially those contained organic dye due and phenolic compounds to its toxic and harmful, has made people take it into a serious consideration [1][2][3][4][5]. 4-Chlorophenol (4-CP) is toxic and non-biodegradable, and is present in wastewater as by-products of pulp and paper, petrochemical industries, dyestuff, and pharmaceutical [6][7][8][9].…”

Optimization of Atrazine Degradation in the Aqueous Phase Using Titanium Catalyst Doped With Iron (Fe+3-TiO2) Processes

“…In recent decades, the unique properties of titanium dioxide (TiO 2 ), such as its high photocatalytic activity, high chemical stability, and low toxicity, have made it a suitable photocatalyst (19). …”

“…Safari and his coworkers showed that the photocatalytic activity of irondoped TiO 2 was greater than TiO2, because of the smaller crystal size, and higher light absorption ability (19). Moreover, Mirovic et al showed that during 2 hours of irradiation of atrazine solution (1 mg/L) with 5 g TiO 2 (0.05%) alginate (1.5%) micro-beads, it was observed that by the end of the experiment, atrazine was being degraded up to 98%, and that the highest level of degradation was attained after 45 minutes (21).…”

“…Over the last decade, the improvement of the TiO 2 catalyst has received a great deal of attention. Several research attempts have involved doping it with a small amount of expensive metals and metal ions, after which it exhibited higher absorbance in visible irradiation (18,19).…”

“…It can only make use of 3% -5% of the solar spectrum that reaches the earth because of its large band gap (Ebg, anatase ∼ = 3.2 ev, rutile ∼ = 3.0 ev) (7); thus, it is essential to produce visible lightresponsive (VLR) TiO 2 , not only to use visible light but also to reduce the recombination of photogenerated electrons and holes (19,20).…”