NOX degradation

(AAM) is copyrighted and published by Elsevier. It is posted here by agreement between Elsevier and the University of Turin. Changes resulting from the publishing process-such as editing, corrections, structural formatting, and other quality control mechanisms-may not be reflected in this version of the text. The definitive version of the text was subsequently published in CHEMICAL ENGINEERING

Nitric oxide generated from various sources like car combustion is one of the most surrounding pollutants. Titanium dioxide considered an environmentally friendly active photocatalytics that can be used with building materials safely and effectively to react with nitric oxides in the presence of UV radiation from sunlight. To study the possibility for the reduction of air pollutants two strategies were adopted. First one included mixing of micro particles of TiO2 with cement paste in two percentages: 3% and 6%. In the second one mortar substrates were coated with micro TiO2 (mT) aqueous solution by either dipping or spraying coating method. A laboratory test procedure was adopted to assess the performance of the prepared photoactive specimens. The specimens were subjected to NO gas and there efficiency in gas removal was monitored with time. Results showed that coating strategy was more effective than mixing strategy in term of gaseous pollutants removal. The comparison between the ...

Nitric oxide generated from various sources like car combustion is one of the most surrounding pollutants, which can be transferred from one form to another in the presence of sunlight. Titanium dioxide considered one of the most environmentally friendly active photocatalytics that can be used with building materials safely and effectively to react with nitric oxides. To study the possibility for the reduction of air pollutants like nitric oxides, two types of substrates coatings were prepared. First, mixing nano particles of TiO2 with cement paste in two percents 3% and 6%. Second, mortar substrates coated with nano TiO2 aqueous solution. Two coating methods have been used dip and spray. A laboratory test procedure was adopted to assess the performance of the prepared photoactive specimens. The specimens were subjected to NO gas and there efficiency in gas removal was monitored with time. Results showed the effectivity of coating building materials with titanium dioxide, the remova...

This article describes a laboratory study on the compressive strength of windblown sand by stabilizing it with ordinary Portland cement (OPC) and polypropylene fibers (PPF). Along with index property tests, laboratory test used for investigating the using of polypropylene fiber as an additive to increase the compressive strength of windblown sand-cement mixture is Compressive Strength of Hydraulic Cement Mortars (CSCM) test (Using 2-in. or [50-mm] Cube Specimens). Test specimens were prepared with varying admixtures of cement content (5%, 10%, 15% and 20% by weight) and polypropylene fibers (0.05%, 0.10%, 0.20%, 0.40% and 0.80% by weight). Compressive strength tests were carried out after 7 and 28-day curing periods. The results show that when polypropylene fibres are mixed in windblown sand-cement mortar, they will be evenly distributed in a matrix, relax the stress concentrations around crack tips, prevent crack expansion and enhance windblown sand-cement mortar mechanical propert...

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit:

(AAM) is copyrighted and published by Elsevier. It is posted here by agreement between Elsevier and the University of Turin. Changes resulting from the publishing process-such as editing, corrections, structural formatting, and other quality control mechanisms-may not be reflected in this version of the text. The definitive version of the text was subsequently published in CHEMICAL ENGINEERING

(AAM) is copyrighted and published by Elsevier. It is posted here by agreement between Elsevier and the University of Turin. Changes resulting from the publishing process-such as editing, corrections, structural formatting, and other quality control mechanisms-may not be reflected in this version of the text. The definitive version of the text was subsequently published in CHEMICAL ENGINEERING

This work evaluated the photocatalytic activity of 3D-printed cementitious mortar specimens functionalized with TiO2 nanoparticles to obtain a multifunctional and smart concrete. This research aims to assess the influence of different parameters related to the functionalization process such as adsorption, coating time gaps, and coating rates on the degradation efficiency of the functionalized cementitious specimens. Each specimen was evaluated under the degradation of Rhodamine B (RhB) in an aqueous solution using a sun-light simulation. The obtained results showed a decrease in adsorption (under dark condition) with increasing the sample curing age. The highest photocatalytic efficiency was observed for coated samples aged 7 days. By increasing the coating rates, the photocatalytic efficiency is enhanced. Nonetheless, regardless of the coating rates, all the specimens showed an increase in photocatalytic efficiency for longer time periods of light exposition, i.e., after 8 h of irr...

The experimental work is divided in two parts, in the first part was prepared the mortar samples and mixing proportions cement\sand (1:3)they were mixing these samples with nano scale ceramic powders (ZrO 2 and TiO 2) respectively the percentages by weight are taken from cement ratio (0.1, 1, 2.5, 5, and 10%) at particle size (50nm) and curing time (28day). The second part has included the preparation of mortar samples and then coated with a mixture of methanol alcohol, cement and ceramic nano-powders by cold spray technique by using compressed air at room temperature with pressure (8bar) and the spray distance (20Cm) and heating of the samples at (75C°), and then study mechanical thermal physical and structural properties for prepared samples. The results of mechanical and physical tests showed large and significant improvement for all mixed and coated samples with nanoparticles, and that the highest value of the mechanical and physical properties obtained from cement coated samples with (%5ZrO 2), reaching the rate of increase in values of Vickers hardness by (%54), and wear resistance increased by (%66), while reaching the rate of decrease in values of total water absorption by (%79), The porosity has decreased at a rate of (%65), With regard to the dry density has increased at a rate of (%2.3). The higher values for the mixed samples reaching the rate of increase in values of Vickers hardness by (%38), and wear resistance increased by (%58), while reaching the rate of decrease in values of total water absorption by (%67), The porosity has decreased at a rate of (%51.68), With regard to the dry density has increased at a rate of (%1.9). The thermal conductivity test results have shown that there is a marked decrease in values conductivity for all mixed and coated samples with nanoparticles and that the minimum value of conductivity obtained from coated and mixed samples with (%5TiO 2) as the value decreases conductivity for coated samples by (%64), while the lowest value for conductivity to the mixed samples by (%49). Results of Characterizations tests showed images of all of (SEM and AFM) Mortar reference sample that a high roughness as well as having to structure Ca(OH) 2 a needle shaped structures with the presence of large pores, while after adding and coating by nanoparticles shows the disappearance of structures needle and produce a homogeneous structure of compounds (C-S-H) and the disappearance of the pores and gaps further decrease in surface roughness this explains the clear improvement in the properties.

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit:

This work evaluated the photocatalytic activity of 3D-printed cementitious mortar specimens functionalized with TiO2 nanoparticles to obtain a multifunctional and smart concrete. This research aims to assess the influence of different parameters related to the functionalization process such as adsorption, coating time gaps, and coating rates on the degradation efficiency of the functionalized cementitious specimens. Each specimen was evaluated under the degradation of Rhodamine B (RhB) in an aqueous solution using a sun-light simulation. The obtained results showed a decrease in adsorption (under dark condition) with increasing the sample curing age. The highest photocatalytic efficiency was observed for coated samples aged 7 days. By increasing the coating rates, the photocatalytic efficiency is enhanced. Nonetheless, regardless of the coating rates, all the specimens showed an increase in photocatalytic efficiency for longer time periods of light exposition, i.e., after 8 h of irr...

h i g h l i g h t s TiO 2 and ZnO nanoparticles protected against fungal fouling of calciferous materials. Light exposure was not necessary for antifungal activity. ZnO was more effective than TiO 2. Commercial nanoparticle suspensions contained microparticles over 100 nm.

At present, the photocatalytic properties of TiO2 are known worldwide. Research on cement composites materials achievement with self-cleaning properties (using the photocatalytic character of TiO2) is a field of real interest. The purpose of this article was to present a synthesis of the research results reported in the specialty literature. The results of the theoretical analysis have shown that the properties of the concrete are positively influenced as long as the amount of nanoparticles is not in excess. In the case of an excess of TiO2 nanoparticles, or their insufficiency, the effect on the concrete property is inversely.

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit:

Concrete has been used as a construction material for building roads and housing structures since early as 6500 BC. It has been modified from the volcanic ash compound used in the early ages to the compound using in the modern era a mixture with cement, aggregates, additives, accelerators and retarders. The aim of this study is to investigate the effect of chemically modified concrete with titanium dioxide (TiO2) and zinc oxide (ZnO) micro particles on compressive strength, tensile strength and workability. The particle sizes used are 0.22-0.23 μm titanium dioxide (TiO2) particles and 1-8 μm zinc oxide (ZnO). The ratios for M25 concrete is 1: 1: 2 the metal oxides are added in 1%, 2%, and 5% in respective to the cement weight to test its properties. Test cubes are casted to test the compressive strength from 7 days curing and 28 days curing. Experiments reveal that the compressive strength of the chemically enhanced M25 concrete is much higher than conventional M25 concrete is much ...

This work evaluated the photocatalytic activity of 3D-printed cementitious mortar specimens functionalized with TiO2 nanoparticles to obtain a multifunctional and smart concrete. This research aims to assess the influence of different parameters related to the functionalization process such as adsorption, coating time gaps, and coating rates on the degradation efficiency of the functionalized cementitious specimens. Each specimen was evaluated under the degradation of Rhodamine B (RhB) in an aqueous solution using a sun-light simulation. The obtained results showed a decrease in adsorption (under dark condition) with increasing the sample curing age. The highest photocatalytic efficiency was observed for coated samples aged 7 days. By increasing the coating rates, the photocatalytic efficiency is enhanced. Nonetheless, regardless of the coating rates, all the specimens showed an increase in photocatalytic efficiency for longer time periods of light exposition, i.e., after 8 h of irr...

In this paper a lower ratio of nano powder were used from (Al2O3 and ZrO2) (0.5, 1.5and 2. 5 wt %) from cement weight, the average particle size of nano-powder were (20nm). These powders were used in fabrication of Concrete with recycle fine aggregate was replaced Natural fine aggregate(sand) in order to be used in construction application and studies the effect on the concrete. Investigation were done on the concrete including dry density, water absorption%, porosity%, compression strength, and wear rate. The results shows that The nano-Al2O3, nano-ZrO2, and recycle aggregate were adding causes difference effect in the physical and mechanical properties of concrete. Compared with control concrete specimens (Co) results for same curing time, the density, and compression strength of concrete were decreased with addition recycle fine aggregate(RFA), while wear rate, water absorption, and porosity % were increased, the lower values of density, compression strength were decreased by (2....

This work evaluated the photocatalytic activity of 3D-printed cementitious mortar specimens functionalized with TiO2 nanoparticles to obtain a multifunctional and smart concrete. This research aims to assess the influence of different parameters related to the functionalization process such as adsorption, coating time gaps, and coating rates on the degradation efficiency of the functionalized cementitious specimens. Each specimen was evaluated under the degradation of Rhodamine B (RhB) in an aqueous solution using a sun-light simulation. The obtained results showed a decrease in adsorption (under dark condition) with increasing the sample curing age. The highest photocatalytic efficiency was observed for coated samples aged 7 days. By increasing the coating rates, the photocatalytic efficiency is enhanced. Nonetheless, regardless of the coating rates, all the specimens showed an increase in photocatalytic efficiency for longer time periods of light exposition, i.e., after 8 h of irr...

In this work, MgO nanoparticles were synthesized via the combustion method using glutamine and L-arginine as fuels for the first time. Also, the synthesized MgO products were identified utilizing FT-IR, XRD, HR-TEM, FE-SEM, UV-Vis, and PL techniques. Besides, the synthesized MgO samples were used for the photochemical degradation of orange G dye as well as biological activity against some bacterial (Staphylococcus aureus and Escherichia coli) and fungal (Candida albicans and Aspergillus flavus) strains. The XRD confirmed that the average crystallite size of MgO products, which were produced using glutamine and L-arginine fuels, is 35.19 and 26.45 nm, respectively. Also, The FE-SEM images confirmed that the MgO products, which were produced using glutamine and L-arginine fuels, is comprised of irregular and flaky shapes with an average size of 13.16 and 9.02 µm, respectively. Additionally, the greatest percent of degradation of orange G dye was 92.30 and 96.60% after 120 min using the MgO samples which were synthesized using glutamine and L-arginine fuels, respectively. Furthermore, the MgO samples show moderate biological activity against bacterial strains whereas they show no biological activity against fungal strains.

Concrete has been used as a construction material for building roads and housing structures since early as 6500 BC. It has been modified from the volcanic ash compound used in the early ages to the compound using in the modern era a mixture with cement, aggregates, additives, accelerators and retarders. The aim of this study is to investigate the effect of chemically modified concrete with titanium dioxide (TiO2) and zinc oxide (ZnO) micro particles on compressive strength, tensile strength and workability. The particle sizes used are 0.22-0.23 μm titanium dioxide (TiO2) particles and 1-8 μm zinc oxide (ZnO). The ratios for M25 concrete is 1: 1: 2 the metal oxides are added in 1%, 2%, and 5% in respective to the cement weight to test its properties. Test cubes are casted to test the compressive strength from 7 days curing and 28 days curing. Experiments reveal that the compressive strength of the chemically enhanced M25 concrete is much higher than conventional M25 concrete is much ...

This work evaluated the photocatalytic activity of 3D-printed cementitious mortar specimens functionalized with TiO2 nanoparticles to obtain a multifunctional and smart concrete. This research aims to assess the influence of different parameters related to the functionalization process such as adsorption, coating time gaps, and coating rates on the degradation efficiency of the functionalized cementitious specimens. Each specimen was evaluated under the degradation of Rhodamine B (RhB) in an aqueous solution using a sun-light simulation. The obtained results showed a decrease in adsorption (under dark condition) with increasing the sample curing age. The highest photocatalytic efficiency was observed for coated samples aged 7 days. By increasing the coating rates, the photocatalytic efficiency is enhanced. Nonetheless, regardless of the coating rates, all the specimens showed an increase in photocatalytic efficiency for longer time periods of light exposition, i.e., after 8 h of irr...

In this work, MgO nanoparticles were synthesized via the combustion method using glutamine and L-arginine as fuels for the first time. Also, the synthesized MgO products were identified utilizing FT-IR, XRD, HR-TEM, FE-SEM, UV-Vis, and PL techniques. Besides, the synthesized MgO samples were used for the photochemical degradation of orange G dye as well as biological activity against some bacterial (Staphylococcus aureus and Escherichia coli) and fungal (Candida albicans and Aspergillus flavus) strains. The XRD confirmed that the average crystallite size of MgO products, which were produced using glutamine and L-arginine fuels, is 35.19 and 26.45 nm, respectively. Also, The FE-SEM images confirmed that the MgO products, which were produced using glutamine and L-arginine fuels, is comprised of irregular and flaky shapes with an average size of 13.16 and 9.02 µm, respectively. Additionally, the greatest percent of degradation of orange G dye was 92.30 and 96.60% after 120 min using the MgO samples which were synthesized using glutamine and L-arginine fuels, respectively. Furthermore, the MgO samples show moderate biological activity against bacterial strains whereas they show no biological activity against fungal strains.

This work evaluated the photocatalytic activity of 3D-printed cementitious mortar specimens functionalized with TiO2 nanoparticles to obtain a multifunctional and smart concrete. This research aims to assess the influence of different parameters related to the functionalization process such as adsorption, coating time gaps, and coating rates on the degradation efficiency of the functionalized cementitious specimens. Each specimen was evaluated under the degradation of Rhodamine B (RhB) in an aqueous solution using a sun-light simulation. The obtained results showed a decrease in adsorption (under dark condition) with increasing the sample curing age. The highest photocatalytic efficiency was observed for coated samples aged 7 days. By increasing the coating rates, the photocatalytic efficiency is enhanced. Nonetheless, regardless of the coating rates, all the specimens showed an increase in photocatalytic efficiency for longer time periods of light exposition, i.e., after 8 h of irr...

In this work, the nano magnesium oxide was incorporated in the cement to study about its photocatalytic property. GGBS was partially replaced in cement by 30% to impart durability. The photocatalytic property was studied for organic pollutant as well as gaseous pollutant. The organic pollutant used to study about self-cleaning property is methyl violet dye solution and the gaseous pollutant used was vehicular emission to study about the degradation of NOX gases. Then the strength and durability aspects of the cement composite was studied from the mortar cubes and tiles specimens. The results show good with the photocatalytic property and durability of incorporated cement composite.

In this work, the nano magnesium oxide was incorporated in the cement to study about its photocatalytic property. GGBS was partially replaced in cement by 30% to impart durability. The photocatalytic property was studied for organic pollutant as well as gaseous pollutant. The organic pollutant used to study about self-cleaning property is methyl violet dye solution and the gaseous pollutant used was vehicular emission to study about the degradation of NOX gases. Then the strength and durability aspects of the cement composite was studied from the mortar cubes and tiles specimens. The results show good with the photocatalytic property and durability of incorporated cement composite.