Photodecomposition Of Methylene Blue Research Articles

Outstanding performance of Co-doped ZnS nanoparticles used as nanocatalyst for synthetic dye degradation

In this work, fabrication of pure and cobalt (Co) doped zinc sulfide (ZnS) nanoparticles were carried out via facile co-precipitation technique using thioglycolic acid as a surfactant. The synthesized nano powders were employed to characterize using various techniques like X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and UV–Vis spectroscopy, to elucidate the alterations in the structure and morphology of nanomaterials. The XRD analysis revealed wurtzite phase of fabricated nanoparticles. Inclusion of Co dopants failed to modify the lattice structure of host material. Analysis of UV–Vis spectroscopy indicates intensive absorption in the visible region upon doping. FTIR spectroscopy was employed to identify functional groups affiliated with molecular vibrations. The photoactivity and kinetics of photo-products were evaluated by monitoring degradation of methylene blue (MB) by solar irradiation. Photodecomposition of MB was significantly increased when Co doped ZnS was employed relative to pristine ZnS. This novel technique of doped ZnS nanoparticles provide an effectual and sustainable route for treatment of wastewater.

Enhancing photodecomposition of cationic organic dyes of rhodamine and methylene blue employing the Ta2O5–CdS composite driven by visible light irradiation

The Ta2O5–CdS composites with the various ratios of Ta2O5/CdS were synthesized to study their employment in the photodecomposition of RhB (rhodamine B)/MB (methylene blue). The samples characterized by XRD, FESEM, EDS, and TEM proved the formation of the Ta2O5–CdS with cauliflower morphology. According to DRS analysis, Ta2O5–CdS exhibited redshifts, and their band-gaps (2.00 eV and 2.10 eV for Ta2O5/CdS = 1 and 3) decreased in contrast to pure CdS (2.18 eV). The BET-specific surface areas (9.221 m2/g) of the Ta2O5–CdS composite (Ta2O5/CdS = 1) measured by N2 adsorption-desorption isotherms were enhanced in contrast to pure CdS (1.817 m2/g). Moreover, MB photodecomposition by Ta2O5–CdS with the weight ratios of Ta2O5/CdS = 3 and 1 improved to 90% and 99%, respectively, in contrast to pure CdS (80%). Besides, the Ta2O5–CdS composite (Ta2O5/CdS = 1) exhibited the highest RhB decomposition (97%). Hence, for the first time, this study has surveyed the photodecomposition of the cationic dyes by the Ta2O5–CdS with excellent photocatalytic performance. The role of active species was detected through species quenching tests. A reliable mechanism was suggested to reveal how the RhB/MB decomposition was promoted compared to CdS. The photodecomposition results corresponded to the pseudo first order kinetic model.

Kinetic analysis of p-rGO/n-TiO2 nanocomposite generated by hydrothermal technique for simultaneous photocatalytic water splitting and degradation of methylene blue dye.

In this study, the nanocomposites of reduced graphene oxide/TiO2 (rGO/TiO2 with different percentages) have been synthesized using a modified Hummers' method followed by hydrothermal treatment. The morphology and bonding structure of the prepared samples have been characterized by Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffractometry (XRD), and X-ray photoelectron spectroscopy (XPS). The photo-characteristic aspects of the prepared samples have been indicated by photoluminescence (PL) emission spectroscopy and ultraviolet-visible diffuse reflection spectroscopy (DRS). The photocatalytic performance of rGO/TiO2 demonstrated that it is an effective photocatalyst for methylene blue (MB) dye decomposition through illumination by a mercury lamp. Within 60 min of continuous irradiation, the nanocomposite-induced MB decomposition reached a rate of over 99%. Different MB concentrations and optimal percent loadings in catalysts have been investigated. Furthermore, the results showed that as the amount of catalyst increased, the decomposition of MB enhanced. Finally, the loading percentage of rGO with TiO2 has been studied, and an empirical equation relating the reaction rate constant until the mass of the photocatalyst and dye concentration has been proposed. The results showed that the prepared nanocomposites had good photocatalytic activity toward water splitting and photo-decomposition of MB.

In situ self-assembled preparation of mesoporous Ag/TiO2-MCM-41@LGCN with excellent applications of photocatalysis-adsorption

For environmental sanitization, the synthesis of highly active electro/photocatalysts has piqued attention. Even so, due to the limited ability of visible light absorption and electron-hole pair recombination, the efficacy of electro/photocatalysts is still poor. Keep in mind the advantages of layered graphitic carbon nitride and mesoporous silica electronic structural design (LGCN). Hydrothermal treatment was used to develop a new material, Ag/TiO2[email protected] heterostructure. The mesoporous silica greatly disseminated on the surface of graphitic carbon nitride consequently therefore, increased surface area per unit volume. To increase the number of active sites, silver and titanium dioxide were riveted on [email protected] exterior. The manufactured nanostructure catalyst was used to remove Cr (VI) and reduce methylene blue (MB) photocatalytically. By varying the contact duration, material amount, and solution pH, the removal efficiency of Cr (VI) was determined. Consequently, 100 % removal efficacy was noted using 0.15 g adsorbent (Ag/TiO2[email protected]) and at pH 2, 200 mg/L adsorbate (Cr (VI), with a contact time of 220 min and a temperature of 25 °C, 2nd order kinetics and isotherm tracked Langmuir model for Cr (VI). The Flory–Huggins model data revealed that the adsorption process is a spontaneous response. For photocatalytic reduction of MB, the said nanostructure was irradiated with visible light. Using 5.0 g of Ag/TiO2[email protected], 95 % of the MB was reduced in 10 min, and the reaction followed 1st order kinetics. The proposed nanostructure is shown to be a potential choice for Cr (VI) adsorption and MB photodecomposition in this work.

SnO2 nanoparticles embedded onto MoS2 nanoflakes - An efficient catalyst for photodegradation of methylene blue and photoreduction of hexavalent chromium

In this work, a molybdenum disulfide/tin oxide (MoS2/SnO2) composite was successfully prepared via a hydrothermal method. The MoS2/SnO2 composite was used as a photocatalyst for photoreduction of hexavalent chromium and photodecomposition of methylene blue. It exhibited higher photocatalytic performance under simulated solar light irradiation than MoS2 itself. The obtained material was characterized by several spectroscopic and microscopic techniques, namely X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). TEM images of the MoS2/SnO2 revealed that SnO2 nanoparticles were embedded into MoS2. Furthermore, photodegradation mechanism and the role of adsorption were discussed. The enhanced photocatalytic performance of MoS2/SnO2 composite can be directly attributed to the presence of SnO2, which may increase the separation efficiency of the electron-hole pairs. The 99.5% of MB removal was achieved after 5 minutes of illumination. To the best of our knowledge, it is one of the most photoactive MoS2-based photocatalysts for methylene blue (MB) photodecomposition. Moreover, the obtained composite was highly active against chromium (VI) photo-reduction. This work provides evidence that the MoS2/SnO2 composite possesses enormous potential in photocatalytic applications.

A new Cu(II) metal–organic architecture driven by ether-bridged dicarboxylate: Photocatalytic properties and Hirshfeld surface analysis

A new Cu(II) coordination polymer with formula {[Cu(L)(bbi)(H2O)]•H2O}n (1) (H2L = 1,3-bis(3ˊ-carboxylatophenoxy)benzene, bbi = 1,1′-(1,4-butanediyl)bis(imidazole)), has been prepared and characterized using microanalysis, single crystal and powder X-ray diffraction techniques. The polymer 1 possess 1D double chain, which further extends into 2D layer through packing and hydrogen bond interactions. The polymer has been used as an effective photocatalyst for the photodisintegration of aromatic dyes viz. methyl violet (MV), Rhodamine B (Rh B) and methylene blue (MB). The results suggest that 1 is best photocatalyst for MB and decomposed 84.14% MB in 100 min following pseudo-first order reaction with rate constant k 0.01873 min−1. Furthermore, the possible photocatalytic mechanism exhibited by 1 for the catalytic degradation of MB was proposed using the trapping experiments and LC-MS methodology which suggested that ·OH is the main reactive oxygen species involved in photodecomposition of MB. In addition, band gap calculations and Hirshfeld surface analysis have been done to substantiate the photocatalytic mechanism.

Preparation of superhydrophobic Ag/Fe2O3/ZnO surfaces with photocatalytic activity

ABSTRACT Combining photocatalytic and superhydrophobicity characteristics on the same surface remains a challenge. In this work it was overcome that challenge by fabricated Ag/Fe2O3/ZnO heterostructure surfaces via using a simple precipitation method; stearic acid (SA) was then employed to improve the roughness and increase the water contact angles (WCA) of the surfaces. The effects of SA and Ag/Fe2O3 on superhydrophobicity and photocatalytic characteristics were investigated. The wettability measurements confirmed that the WCA of the surfaces increased from 60 ± 2° to 154 ± 2° after modification with SA due to the formation of a hierarchical structure. To evaluate the photocatalytic performance of samples, methylene blue (MB) dye was irradiated under visible light with quick photodecomposition of MB after 80 min of irradiation. Finally, this innovative approach can be utilized to develop scaled-up self-cleaning applications.

TiO2 Co-doped with Zr and Ag shows highly efficient visible light photocatalytic behavior suitable for treatment of polluted water.

The objective of this study is to analyze the effects of zirconium (Zr) and silver (Ag) doping on the photoactivity of titania (TiO2). Zr–Ag (ZA) co-doped TiO2 products were fabricated via sol–gel technique and their properties (structural and chemical) were characterized. The weight ratio of TiO2 was fixed, while weight ratios of Zr and Ag were varied from 2 to 4, 6 and 8 wt% while synthesized samples were calcined at 400 °C for 3 h. The XRD results demonstrated that the incorporation of metal doping agents failed to alter the host material's lattice structure, however, its crystallite size was reduced from 13.54 to 5.05 nm with increasing Zr4+ and Ag+ concentrations. FTIR spectroscopy was used to examine various functional groups. In the attained spectra, an ample absorption peak between 500 and 1000 cm−1 was recorded, which was ascribed to Ti–O–Ti linkage vibration mode present within TiO2. Surface morphology, microstructure, SAED patterns and elemental composition were examined with FE-SEM, HR-TEM and EDX, which served to confirm the ZA-doped TiO2 product. Band gap energy of the co-doped material was significantly reduced as indicated by a higher wavelength redshift in the spectra. The photoactivity and kinetics of photo-products were investigated by observing photo-decolorization of methylene blue (MB) under a radiation source. Photodecomposition of MB was dramatically enhanced when titania co-doped with Zr and Ag was employed compared to un-doped or mono-doped TiO2. The ZA (8 wt%) co-doped TiO2 photocatalyst depicted the maximum MB removal efficiency (∼93%) within 90 min under a light source.

One-pot hydrothermal synthesis and characterization of magnetic nanocomposite of titania-deposited copper ferrite/ferrite oxide for photocatalytic decomposition of methylene blue dye

The pure titania (TiO2) and the heterogeneous ternary magnetic nanocomposite of copper ferrite/ferrite oxide (CuFe2O4/Fe2O3) deposited by titanium dioxide (TiO2) were fabricated using a facile one-pot hydrothermal synthesis for the photocatalytic decomposition of methylene blue (MB) dye, under visible light. The nanocomposite was encoded as TCF in this work, where T stands for TiO2, C for CuFe2O4 and F for Fe2O3. Various techniques such as powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy, diffuse reflectance spectroscopy, nitrogen physisorption, and vibrational sample magnetometry (VSM) were used to characterize the prepared samples. The PXRD data showed that the samples had pure anatase structure and the average crystal size of anatase TiO2 in the pure titania and ternary nanocomposite were calculated 147 Å and 135 Å, respectively. The nitrogen physisorption analysis data showed that the pore diameter was increased from 10.6 nm in pure titania to 16.0 nm in TCF. The pore volume was also increased from 0.316 in titania to 0.383 cm3/g in TCF sample. It also increased the typical magnitude of the mesopores’ diameter and volume per weight but it reduced the specific surface area of the samples. The VSM analysis of the ternary nanocomposite showed a considerable magnetic property of the sample (1.99 emu/g), qualifying it as a paramagnetic material. The photocatalytic decomposition efficiency of MB reached 77% and 68% in the presence of pure titania and TCF ternary nanocomposite, after 240-min exposure by the visible light. Active species trapping experiments showed that the major active species responsible for the photodecomposition of MB in the presence of TCF are {text{O}}_{2}^{ cdot - } radicals and holes (h+).

Effect of N and F content on structural, optical and photocatalytic methylene blue degradation properties of TiO2

Photocatalytic systems based on fluorine- and nitrogen-doped titanium dioxide were obtained via the sol–gel method. Titanium tetraisopropoxide and ammonium fluoride were used as precursors. Transmission electron microscopy and measurement of Brunauer–Emmett–Teller surface area and porosity were used to establish that the concentration of ammonium fluoride has an impact on the structural parameters of titanium dioxide produced in the sol–gel process. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy revealed that the dopants (F and N) are not incorporated into the crystal lattice of titanium dioxide, but affect the optical properties of titanium dioxide due to the emergence of additional bands in the absorption spectra in the range of 380–450 nm. Sorption and photoactivity were found using methylene blue photodecomposition under visible light. It was found that dopant introduction increases both sorption ability and photoactivity of the materials.

Synthesis and Characterization of Ag-Ag2O/TiO2@polypyrrole Heterojunction for Enhanced Photocatalytic Degradation of Methylene Blue

Hybrid multi-functional nanomaterials comprising two or more disparate materials have become a powerful approach to obtain advanced materials for environmental remediation applications. In this work, an Ag-Ag2O/TiO2@polypyrrole (Ag/TiO2@PPy) heterojunction has been synthesized by assembling a self-stabilized Ag-Ag2O (p type) semiconductor (denoted as Ag) and polypyrrole (π-conjugated polymer) on the surface of rutile TiO2 (n type). Ag/TiO2@PPy was synthesized through simultaneous oxidation of pyrrole monomers and reduction of AgNO3 in an aqueous solution containing well-dispersed TiO2 particles. Thus synthesized Ag/TiO2@PPy was characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and UV-Vis diffuse reflectance spectroscopy (UV-vis DSR). The photocatalytic activity of synthesized heterojunction was investigated for the decomposition of methylene blue (MB) dye under UV and visible light irradiation. The results revealed that π-conjugated p-n heterojunction formed in the case of Ag/TiO2@PPy significantly enhanced the photodecomposition of MB compared to the p-n type Ag/TiO2 and TiO2@PPy (n-π) heterojunctions. A synergistic effect between Ag-Ag2O and PPy leads to higher photostability and a better electron/hole separation leads to an enhanced photocatalytic activity of Ag/TiO2@PPy under both UV and visible light irradiations.

UV-cured polymeric films containing ZnO and silver nanoparticles with UV–vis light-assisted photocatalytic activity

Hybrid polymer composites incorporating preformed ZnO alone or its mixture with Ag nanoparticles created during UV irradiation of some urethane acrylic monomers including trietoxysilylpropyl carbamoyloxyethyl methacrylate were synthesized and characterized by spectroscopic (1H (13C) NMR, FTIR, UV–vis, fluorescence, X-ray diffraction) and microscopic (AFM, ESEM/EDX, TEM) techniques. The results confirmed that the double bond conversion measured through FTIR spectroscopy varied in the range of 57–90% (after 60s of irradiation), exhibiting formulation composition dependence. In the crosslinked polymer networks the existence of individual nanoparticles with primarily spherical shape and sizes between 5 and 15nm for ZnO, and around 3nm for in situ photogenerated silver nanoparticles was evidenced. Additionally, the photocatalytic effect of the photopolymerized hybrid films was investigated by determining the decomposition rate of the methylene blue (MB) in ethanol (over 90%) under UV (2.7×10−2s−1) and visible irradiation (2.9×10−2min−1). It was found that the composite films containing a higher amount of ZnO-Ag nanoparticles placed in water induced the photodecomposition of MB (∼87% after 100min of visible irradiation; k=2.1×10−2min−1). The good efficiency of the NPs from these polymer films make them attractive for applications in photocatalysis of organic dye molecules.

Photocatalytic properties of TiO2/ZnO thin film

ABSTRACTTiO2, ZnO and ZnO/TiO2 thin films have been prepared by radio frequency magnetron sputtering method under different temperatures. Their photo catalytic activities have been investigated. The structural of the thin films were characterized by X-ray diffraction and Raman spectroscopy. The photo catalytic activities of TiO2 and ZnO/TiO2 samples were evaluated by the photo decomposition of methylene blue. We note that the structural proprieties of the thin films showed a perfect crystallization along the (002) for ZnO, Rutile (110) for TiO2 and Anatase (101) for TiO2. The experimental results show that the bilayer ZnO/TiO2 were the most efficient photo catalysts compared to the layer of TiO2. This increased catalytic effect can attributed to the interface between the ZnO layer and the TiO2 one, which modify significantly the chemical potential of the bilayer.

Facile in situ hydrothermal synthesis of BiVO4/MWCNT nanocomposites as high performance visible-light driven photocatalysts

Visible-light responsive monoclinic BiVO4/MWCNT nanocomposites were facilely prepared via an in situ hydrothermal method by using sodium dodecyl sulfonate (SDS) as a guiding surfactant. The as-prepared BiVO4/MWCNT nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), the Fourier transform infrared spectroscopy (FTIR) and UV–vis diffuse reflectance spectroscopy. The results showed that the hydrothermal temperature and adding SDS had significant influence on the morphology and size of BiVO4. The photocatalytic activities of BiVO4/MWCNT nanocomposites were investigated by degrading methylene blue (MB) under visible-light irradiation. Remarkable enhancement in photodecomposition of MB was observed with BiVO4/MWCNT composite compared with bare BiVO4 particles. This improvement of photocatalytic was attributed to the effective charge transfer from BiVO4 nanocrystals to MWCNT, which promoted the migration efficiency of photogenerated electron–hole. Furthermore, a possible mechanism for the photocatalytic oxidative degradation was also discussed.

Core/shell CdS/ZnS nanoparticles: Molecular modelling and characterization by photocatalytic decomposition of Methylene Blue

Core/shell CdS/ZnS nanoparticles were modelled in the Material Studio environment and synthesized by one-pot procedure. The core CdS radius size and thickness of the ZnS shell composed of 1–3 ZnS monolayers were predicted from the molecular models. From UV–vis absorption spectra of the CdS/ZnS colloid dispersions transition energies of CdS and ZnS nanostructures were calculated. They indicated penetration of electrons and holes from the CdS core into the ZnS shell and relaxation strain in the ZnS shell structure. The transitions energies were used for calculation of the CdS core radius by the Schrödinger equation. Both the relaxation strain in ZnS shells and the size of the CdS core radius were predicted by the molecular modelling.The ZnS shell thickness and a degree of the CdS core coverage were characterized by the photocatalytic decomposition of Methylene Blue (MB) using CdS/ZnS nanoparticles as photocatalysts. The observed kinetic constants of the MB photodecomposition (kobs) were evaluated and a relationship between kobs and the ZnS shell thickness was derived. Regression results revealed that 86% of the CdS core surface was covered with ZnS and the average thickness of ZnS shell was about 12% higher than that predicted by molecular modelling.

CdS/TiO2 composite films for methylene blue photodecomposition under visible light irradiation and non-photocorrosion of cadmium sulfide

AbstractCadmium sulfide/titanium dioxide (CdS/TiO2) composite films were grown on glass by the chemical bath deposition (DBQ) and sol-gel/dip coating methods, respectively, in order to increase the photocatalytic activity of TiO2 in photodegradation processes. The influence of the CdS deposition time on the morphology, optical absorption, and phononic modes of the composites were examined. Scanning electron microscopy (SEM) images showed clearly the CdS deposit on the TiO2 surface. The absorbance spectra indicated that the absorption of composites depends on the CdS deposition time and the absorption edges are shifted to the visible range. Micro Raman spectra exhibited the phonons associated with the TiO2 anatase and the longitudinal optic (LO) phonon of CdS whose intensity increases with the CdS deposition time. Photodegradation of methylene blue (MB) under visible light irradiation was observed in all films and the results were compared with those obtained with TiO2 films. The decomposition is higher for the composite with the CdS deposition time of 15 min. This optimal deposition time allows maximal enhancement of the charge carriers transfer to TiO2 involved in the photocatalysis. No signal associated with cadmium was detected by the atomic absorption spectroscopy (AAS), which means that the CdS photocorrosion does not occur since trap centers such as OH-Cd-S and Cl−, which trap holes and inhibit the photocorrosion, are produced during the growth process.

Photocatalytic activity of phthalocyanine-sensitized TiO2–SiO2 microparticles irradiated by visible light

Zinc phthalocyanine (ZnPc) modified by cyanuric chloride was supported on TiO2–SiO2 microparticles (ZnPc–SiO2–TiO2) by covalent bonds to produce a novel photosensitizer, ZnPc–SiO2–TiO2. ZnPc sensitized TiO2 to light in the visible range, while the TiO2 acted as an acceptor of electrons generated by the photon irradiation; thus, this material can absorb low-energy photons to emit photons of higher energy. The as-prepared ZnPc–SiO2–TiO2 was characterized using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and UV–vis diffuse reflectance spectroscopy (DRS). The results of photodecomposing methylene blue (MB) revealed that ZnPc–SiO2–TiO2 had great photocatalytic activity under visible-light irradiation (λ>400nm). By analyzing electron paramagnetic resonance (EPR) spectra, we proposed a possible mechanism for the photodecomposition of MB by ZnPc–SiO2–TiO2.

Visible Light Photocatalytic Activity of N-Ion Implanted TiO<SUB>2</SUB> Thin Films Prepared by Oblique Incident Electron-Beam Evaporation Method

TiO2 thin films were prepared using electron-beam evaporation method with various oblique angles of 0 degrees, 30 degrees, 60 degrees and 75 degrees. All samples were annealed at 600 degrees C for 1 hour in air and their visible light photocatalytic properties were characterized after nitrogen implantation. The photocatalytic activity of the thin films was evaluated by the photodecomposition of methylene blue. The photocatalytic activity of N-ion implanted TiO2 film deposited with the oblique angle of 60 degrees was considerably enhanced due to high visible light absorption and low charge carrier recombination by sufficient N-ion implantation.

Photocatalytic Activity of TiO<sub>2</sub>-Calcium Phosphate Nanocomposite on the Removal of Methylene Blue in Aqueous Suspension

The TiO2-calcium phosphate (TiO2/CP) nanocomposites with different ratios were prepared by precipitation of calcium phosphate in the presence of nano-sized TiO2. The products were characterized by BET, XRD, SEM and EDX techniques. Photocatalytic activity of the nanocomposites was evaluated as a rate constant of decomposition reaction of methylene blue (MB) in aqueous suspensions under UVA irradiation. It was observed that all of the nanocomposites showed higher photocatalytic activity in comparison to pure TiO2 catalyst. In particular, the rate constant photodecomposition of MB on TiO2/CP composite at 9:1 ratio (w/w) was above five times higher than on pure TiO2.

Photodecomposition of Methylene Blue by the S, Al Doped TiO<sub>2</sub> Mesoporous Materials

Mesoporous sulfur, aluminium doped TiO2 materials (S-Al-TiO2, S-TiO2, Al-TiO2) have been synthesized by solid-state reaction route. The textural properties of the samples are monitored by the X-ray diffraction (XRD), Scanning electron micrography (SEM), Fourier transform infrared spectroscopy (FT-IR), ultraviolet visible light spectroscopy (UV-Vis) and N2-physisorption. Moreover, compared with the pure TiO2, the photodecomposition properties of methylene blue (MB) irradiated with ultraviolet and visible light are presented on the doped TiO2 materials. It is shown that TiO2 doped by sulfur and /or aluminium are mesoporous materials, and the S and Al enter into the crystal lattice of TiO2. At 298K, the rule of pseudo-first-order reaction and excellent visible light catalytic activity are obtained in the photodecomposition of MB on the S-Al-TiO2, S-TiO2, Al-TiO2 and pure TiO2 materials. Interestingly, the reaction rate constant of MB on the S-Al-TiO2 meso- porous nanomaterial is 11.40 times irradiated with the ultraviolet than that with visible light irradiation. But there is 1.42 times corresponding to the pure TiO2. Within 50 min, ultraviolet degradation rate of MB over the S-Al-TiO2 is 98.5%.