The synthesis of ZnS/TiO 2 nanocomposite was successfully performed by a chemical deposition method. The structure and morphology of the prepared catalyst were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and FT-IR spectroscopy. The activity of the photocatalyst was evaluated for the removal of Acid Blue 113 (AB113) dye in aqueous solution under UV-A radiation. Response surface methodology (RSM) based on the central composite rotatable design (CCRD) was applied to study and optimize the photodegradation process. The effects of three experimental parameters including pH, irradiation time, and the catalyst dose on the AB113 removal were studied. A high dye removal (99.0%) was obtained by using minimum amount of the catalyst (37 mg) at the optimal conditions of 27.32 min and pH 6.18. Compared with pure nano-sized TiO 2 and ZnS, the synthesized nanocomposite exhibited a higher photocatalytic activity. The kinetics of AB113 adsorption on the surface of ZnS/TiO 2 nanocomposite could be described by the pseudo second order and parabolic-diffusion models.

To improve the hot section metallic parts durability in advanced gas-turbine operating in power generation and aircraft, thermal barrier coating (TBCs) are extensively utilized to increase their lifetime. The reason for applying coatings on these components is the improvement of their physical properties, mechanical properties, and outer look. The self-repairing ability of materials is very promising due to expanding the service time of materials and it is also beneficial in terms of human safety and financial aspects. In this review article, structure, properties, limitations, and the modification approaches of TBCs were studied. In addition, self-healing agents for TBCs including SiC, MoSi 2 , TiC were introduced, which release their oxide by reaction with air and O 2 that are able to heal the pores/cracks in the coatings. In this regard, their coating methods, mechanism, and applications in TBCs were reviewed.

‫ﺳﻄﺢ‬ ‫روش‬ ‫از‬ ‫اﺳﺘﻔﺎده‬ ‫ﺑﺎ‬ ‫ﭘﺎﺳﺦ‬‫ﺳﺠﺎد‬ ‫ﻃﺎﻟﺒﯽ‬ ، ‫ﺑﺨﺶ‬ ‫ﭼﺎﺋﯽ‬ ‫ﻧﺎز‬ ‫ﻟﻨﮕﺮودي‬ * ، ‫ﻣﺮادي‬ ‫زﯾﻨﺐ‬ ‫ﺷﻮﺋﯿﻠﯽ‬ ‫اﯾﺮان‬ ‫رﺷﺖ،‬ ‫ﮔﯿﻼن،‬ ‫داﻧﺸﮕﺎه‬ ‫ﭘﺎﯾﻪ،‬ ‫ﻋﻠﻮم‬ ‫داﻧﺸﮑﺪه‬ ‫ﺷﯿﻤﯽ،‬ ‫ﮔﺮوه‬ ‫ﺗﺎرﯾﺦ‬ ‫درﯾﺎﻓﺖ‬ ‫ﻣﻘﺎﻟﻪ‬ : 7 / 7 / 1395 ‫؛‬ ‫ﺗﺎرﯾﺦ‬ ‫ﭘﺬﯾﺮش‬ : 12 / 11 / 1395 ‫ﮐﻠﻤﺎت‬ ‫ﮐﻠﯿﺪي‬ : ‫ﻓﻮﺗﻮﮐﺎﺗﺎﻟﯿﺰور‬ ‫رﻧﮓ،‬ ‫ﺗﺨﺮﯾﺐ‬ ، ‫ذرات‬ ‫ﻧﺎﻧﻮ‬ ‫ﺗﺎز‬ ‫آﻧﺎ‬ TiO 2 ، ‫ﺑﻠﻮ‬ ‫اﺳﯿﺪ‬ 113 ‫ﻃﺮاﺣﯽ‬ ، Box-Behnken ‫ﺑﻬﯿﻨﻪ‬ ‫رﻧﮓ‬ ‫ﻧﻮري‬ ‫ﺗﺨﺮﯾﺐ‬ ‫ﺳﺎزي‬ ‫ﺑﻠﻮ‬ ‫اﺳﯿﺪ‬ ‫زاي‬ 113 ‫ﻧﺎﻧﻮ‬ ‫روي‬ ‫ﺑﺮ‬ ‫ﺗﺎز‬ ‫آﻧﺎ‬ ‫ﮐﺎﺗﺎﻟﯿﺰور‬ TiO2 ‫اﺳﺘﻔﺎده‬ ‫ﺑﺎ‬ ‫ﭘﺎﺳﺦ‬ ‫ﺳﻄﺢ‬ ‫روش‬ ‫از‬ 150 ♦ ‫ﻣﺤﯿﻂ‬ ‫ﺑﻬﺪاﺷﺖ‬ ‫ﻣﻬﻨﺪﺳﯽ‬ ‫ﻣﺠﻠﻪ‬ ، ‫ﺷﻤﺎره‬ ‫ﭼﻬﺎرم،‬ ‫ﺳﺎل‬ 2 ‫زﻣﺴﺘﺎن‬ ، 1395 ‫ﺑﻬﯿﻨﻪ‬ ‫رﻧﮓ‬ ‫ﻧﻮري‬ ‫ﺗﺨﺮﯾﺐ‬ ‫ﺳﺎزي‬ ‫ﺑﻠﻮ‬ ‫اﺳﯿﺪ‬ ‫زاي‬ 113 ‫ﻧﺎﻧﻮ‬ ‫روي‬ ‫ﺑﺮ‬ ‫ﺗﺎز‬ ‫آﻧﺎ‬ ‫ﮐﺎﺗﺎﻟﯿﺰور‬ TiO2 ‫اﺳﺘﻔﺎده‬ ‫ﺑﺎ‬ ‫ﭘﺎﺳﺦ‬ ‫ﺳﻄﺢ‬ ‫روش‬ ‫از‬ ‫ﺑﻬﯿﻨﻪ‬ ‫رﻧﮓ‬ ‫ﻧﻮري‬ ‫ﺗﺨﺮﯾﺐ‬ ‫ﺳﺎزي‬ ‫ﺑﻠﻮ‬ ‫اﺳﯿﺪ‬ ‫زاي‬ 113 ‫ﻧﺎﻧﻮ‬ ‫روي‬ ‫ﺑﺮ‬ ‫ﺗﺎز‬ ‫آﻧﺎ‬ ‫ﮐﺎﺗﺎﻟﯿﺰور‬ TiO2 ‫اﺳﺘﻔﺎده‬ ‫ﺑﺎ‬ ‫ﭘﺎﺳﺦ‬ ‫ﺳﻄﺢ‬ ‫روش‬ ‫از‬ 160 ♦ ‫ﻣﺤﯿﻂ‬ ‫ﺑﻬﺪاﺷﺖ‬ ‫ﻣﻬﻨﺪﺳﯽ‬ ‫ﻣﺠﻠﻪ‬ ، ‫ﺷﻤﺎره‬ ‫ﭼﻬﺎرم،‬ ‫ﺳﺎل‬ 2 ‫زﻣﺴﺘﺎن‬ ، 1395ABSTRACT Background: Over the last decades, many efforts have been made to improve the wastewater purification by developing suitable treatment methods for various pollutants removal. Most studies in this field have focused on heterogeneous photocatalysis which use semiconductor oxides, such as titanium dioxide (TiO2). This useful technique is based on the pollutant decomposition by means of a chemical reaction occurring on a photocatalytic surface activated by light with a specific wavelength. The efficiency for removing of persistent organic pollutants such as azo dyes, photostability and inertness to chemical environment has made TiO2 an important photocatalytic material. In this study, the photodegradation of an industrial textile dye Acid blue 113 (AB113), using anatase TiO2 nanoparticles and ultraviolet (UV-A) radiation, has been performed in an aqueous heterogeneous medium. Methods: The photocatalytic process was monitored by the UV-visible spectrometry, and different dosages of catalyst (10.00-60.00 mg), pH conditions (3-8), contact time (2-30 min), at the dye concentration of 25 mg/L were used. In addition, response surface methodology based on a threevariable three-level Box-Behnken design was employed to study and optimize the photocatalytic process. The interactive effects of three operational parameters including irradiation time, pH, and the catalyst amount on the dye degradation were analyzed. Results: The dye degradation efficiency was accurately modeled by a quadratic equation with an R 2 of 0.9649. The optimum conditions for the dye removal were found at 29.78 min, pH 6.56 and catalyst dose of 42 mg in 100 mL of the solution. At this condition, 95.3% of the dye was removed. Conclusion:The results show that anatase TiO2 nanoparticles present excellent photocatalytic activity on the degradation of AB113 under UV irradiation. Therefore, the photodegradation of dyes using anatase TiO2 nanoparticlesas can be efficiently used under optimum conditions for treatment of dyecontaining industrial effluents.