NO  removal of mortar mixed with titania produced from Ti-salt flocculated sludge

Park, Se Min; Chekli, Laura; Kim, Jong Beom; Shahid, Mohammad Hasan; Shon, Ho Kyong; Kim, Phan Seok; Lee, Woon-Seek; Lee, Woong Eui; Kim, Jong-Ho

doi:10.1016/j.jiec.2013.12.090

Cited by 17 publications

(15 citation statements)

References 18 publications

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“…From Figures 5 and 6, it is clear that the prepared A-TiO 2 was found to be inferior to photodegrade acetaldehyde and NO x as compared with P25. The aforementioned is in contrary with most of the previous studies, where TiO 2 NPs produced from Ti-based flocculation were found to be either superior or almost similar to P25 with regards to the photodegradation of volatile organic compounds [6,43,44]. The following postulates may explain the reduced photocatalytic activities of the prepared A-TiO 2 :…”

Section: Photocatalytic Activity Of Prepared A-tio 2 Npscontrasting

confidence: 70%

“…On the other hand, particles present in A-Residue were partially agglomerated, and the average particle size was approximately 50 nm. The particles of the prepared A-TiO2 corresponds well with the TiO2 NPs that were prepared by Park et al [43] and El Saliby et al [44] through flocculation of dye wastewater and biologically treated sewage effluent, respectively, while using Ti-based coagulant. In contrast, TiO2 prepared from secondary sewage effluent and paper mill wastewater showed a smaller (<20 nm) particle size [21,22].…”

Section: Physicochemical Properties Of the Prepared A-tio2supporting

confidence: 64%

“…Similarly, following ISO 22197-1, the NOx removal efficiency of A-TiO2 was compared with P25 ( Figure 6). At the beginning of UV irradiation, A-TiO2 and P25 both exhibited a rapid reduction of NO, probably due to the combined effect of adsorption and photodegradation [43]. Moreover, the maximum removal of NO achieved under UV irradiation was 57.10% and 78.22% for A-TiO2 and P25, respectively.…”

Section: Photocatalytic Activity Of Prepared A-tio 2 Npsmentioning

confidence: 96%

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Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

et al. 2020

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The purpose of the study was to effectively treat algae bloomed water while using a Ti-based coagulant (TiCl4) and recover photoactive novel anatase TiO2 from the flocculated sludge. Conventional jar tests were conducted in order to evaluate the coagulation efficiency, and TiCl4 was found superior compared to commercially available poly aluminum chloride (PAC). At a dose of 0.3 g Ti/L, the removal rate of turbidity, chemical oxygen demand (COD), and total phosphorus (TP) were measured as 99.8%, 66.7%, and 96.9%, respectively. Besides, TiO2 nanoparticles (NPs) were recovered from the flocculated sludge and scanning electron microscope (SEM), energy dispersive X-ray spectroscope (EDX), and X-ray diffraction (XRD) analysis confirmed the presence of only anatase phase. The recovered TiO2 was found to be effective in removing gaseous CH3CHO and NOx under UV-A lamp at a light intensity of 10 W/m2. Additionally, the TiO2 mixed mortar blocks that were prepared in this study successfully removed atmospheric nitrogen oxide (NOx) under UV irradiance. This study is one of the first to prepare anatase TiO2 from flocculated algal sludge and it showed promising results. Further research on this novel TiO2 concerning internal chemical bonds and shift in the absorbance spectrum could explore several practical implications.

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Section: Photocatalytic Activity Of Prepared A-tio 2 Npscontrasting

confidence: 70%

Section: Physicochemical Properties Of the Prepared A-tio2supporting

confidence: 64%

Section: Photocatalytic Activity Of Prepared A-tio 2 Npsmentioning

confidence: 96%

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Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

et al. 2020

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“…P-25 is a commercial TiO 2 preparation which, if incorporated into large civil buildings, is extremely expensive. It is essential to produce low-cost TiO 2 , for example from the coagulant-containing sludge of wastewater treatment [27,28,29]. The NP-400 form of TiO 2 manufactured in Korea is equivalent to P-25 in terms of mechanical and catalytic properties, but is only half the price.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Oxides Mitigation Efficiency of Cementitious Materials Incorporated with TiO2

et al. 2018

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We explored the photocatalytic capacities of cementitious materials (cement paste and mortar) incorporating titanium dioxide (TiO2). P-25 is a commercial TiO2 preparation which, if incorporated into large civil buildings, is extremely expensive. It is essential to produce low-cost TiO2. A cheap anatase form of TiO2 powder, NP-400, manufactured under relatively low burning temperature, was considered in this paper. Addition of NP-400 to 0, 5, 10, and 20 wt % did not significantly affect the compressive strengths of mortar or cement paste. However, the compressive strengths of P-25-containing specimens were more consistent than those of NP-400-containing materials. The nitrogen oxide (NO) removal efficiencies by mortar with 5 and 10 wt % TiO2 were similar at ca. 14–16%; the removal efficiency by mortar with 20 wt % NP-400 was ca. 70%. Although the NP-400 cluster size was almost halved by ultrasonication, NO removal efficiency was not enhanced. Removal was enhanced by the presence of accessible surface area: NP-400 dispersed in these surfaces readily adsorbed NO, aided by the large surface areas of the top and bottom faces. Scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM–EDX) confirmed that NP-400 tended to sink when added to cement, fine aggregates, and water because the true densities of P-25, NP-400, and cement powder differed (3.41, 3.70, and 3.15 g/mL). The true density of NP-400 was thus the highest of all ingredients. The relatively low apparent density of P-25 compared to that of NP-400 was associated with a more bulky distribution of P-25 within cementitious materials. Nevertheless, NP-400 could be a viable alternative to the definitive product, P-25.

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“…Compounds of titanium, especially TiO 2 , are being used as pigment in the dyeing industry and as catalysts of chemical reactions. Due to the catalysing properties of reduction in nitric oxides, TiO 2 is used as an additive in asphalt surfaces, concrete, mortars (Park 2014) and exterior paint. Titanium compounds emitted by anthropogenic point sources are understood as pollutants.…”

Section: Discussionmentioning

confidence: 99%

Titanium compounds and their impact on the transformation of air pollutants

Bok¹,

Bożym²

2015

geol

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Titanium, as a transition metal, demonstrates a high mechanical strength. It is light and corrosion resistant. The estimation of the environmental impact of the use of machine parts that grains are freed from and contact the surface of titanium alloys by wear is buffing. Due to its catalytic action, TiO 2 is nowadays added to asphalt, concrete, exterior paints for elevation, self-cleaning glass and protective coatings. It is also present in clothes, food (E171), cosmetics (CI 77891) and textiles. The research on the toxicity of titanium and its compounds points towards their neutral character, however an adverse impact is also observed in nature. TiO 2 may affect air quality. It promotes free radicals and ozone origination. The properties and direction of the use of titanium compounds and their influence on the circulation of pollutants are described below.

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NO removal of mortar mixed with titania produced from Ti-salt flocculated sludge

Cited by 17 publications

References 18 publications

Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

Nitrogen Oxides Mitigation Efficiency of Cementitious Materials Incorporated with TiO2

Titanium compounds and their impact on the transformation of air pollutants

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