Possible Impact of Heterogeneous Photocatalysis on the Global Chemistry of the Earth's Atmosphere

Zamaraev, K. I.; Khramov, M. I.; Parmon, Valentin N.

doi:10.1080/01614949408013930

Cited by 61 publications

(39 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Photoreduced metal compounds may further act as effective chemical reductants (Ola and Maroto-Valer, 2015;Xu et al, 2015), and the oxidized compounds such as hydroxyl radicals or chlorine atoms can further act as effective oxidants. Zamaraev et al (1994) proposed the decomposition of reducing atmospheric components such as CH 4 by the photolytically induced oxidation power of the oxides of iron, titanium and some other metal oxide containing mineral dust components. Accordingly, Zamaraev designated the dustgenerating deserts of the globe as "kidneys of the earth" (Zamaraev, 1997) and the atmosphere as a "giant photocatalytic reactor" where numerous physicochemical and photochemical processes occur (Zamaraev et al, 1994).…”

Section: Oxidation Of Methane and Other Ghgsmentioning

confidence: 99%

“…Zamaraev et al (1994) proposed the decomposition of reducing atmospheric components such as CH 4 by the photolytically induced oxidation power of the oxides of iron, titanium and some other metal oxide containing mineral dust components. Accordingly, Zamaraev designated the dustgenerating deserts of the globe as "kidneys of the earth" (Zamaraev, 1997) and the atmosphere as a "giant photocatalytic reactor" where numerous physicochemical and photochemical processes occur (Zamaraev et al, 1994). Researchers have proposed giant photocatalytic reactors to clean the atmosphere of several GHGs, such as N 2 O (de Richter et al, 2016b), CFCs and HCFCs (de Richter et al, 2016a) and even CO 2 after direct air capture (Kiesgen de Richter et al, 2013), as almost all GHGs can be transformed or destroyed by photocatalysis (de Richter and Caillol, 2011;de Richter et al, 2017).…”

Section: Oxidation Of Methane and Other Ghgsmentioning

confidence: 99%

See 1 more Smart Citation

Climate engineering by mimicking natural dust climate control: the iron salt aerosol method

et al. 2017

View full text Add to dashboard Cite

Abstract. Power stations, ships and air traffic are among the most potent greenhouse gas emitters and are primarily responsible for global warming. Iron salt aerosols (ISAs), composed partly of iron and chloride, exert a cooling effect on climate in several ways. This article aims firstly to examine all direct and indirect natural climate cooling mechanisms driven by ISA tropospheric aerosol particles, showing their cooperation and interaction within the different environmental compartments. Secondly, it looks at a proposal to enhance the cooling effects of ISA in order to reach the optimistic target of the Paris climate agreement to limit the global temperature increase between 1.5 and 2 • C.Mineral dust played an important role during the glacial periods; by using mineral dust as a natural analogue tool and by mimicking the same method used in nature, the proposed ISA method might be able to reduce and stop climate warming. The first estimations made in this article show that by doubling the current natural iron emissions by ISA into the troposphere, i.e., by about 0.3 Tg Fe yr −1 , artificial ISA would enable the prevention or even reversal of global warming. The ISA method proposed integrates technical and economically feasible tools.

show abstract

Section: Oxidation Of Methane and Other Ghgsmentioning

confidence: 99%

Section: Oxidation Of Methane and Other Ghgsmentioning

confidence: 99%

Climate engineering by mimicking natural dust climate control: the iron salt aerosol method

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In the past, several physical techniques like photo degradation, coagulation, flocculation, reverse osmosis, adsorption on the activated carbon, ion exchange method ultrafiltration and chemical methods like photosensitized oxidation, adsorption [15], have been used to reduce the toxic dye effluents from waste water [9][10][11][12] though methods are fairly effective in removing pollutants. However the main drawback of these techniques is formation of secondary waste product which cannot be treated again and dumped as such [13,14].…”

Section: Introductionmentioning

confidence: 99%

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Kumar

Gajanan

ey³

2017

MSEIJ

219

124

View full text Add to dashboard Cite

The oxidation rates and efficiency of the photocatalytic system are highly dependent on a number of operational parameters that govern the photodegradation of the organic molecule. Several study have been reported the significance of operational parameter. The photodegradation depends on the some basic parameters which are concentration of substrate, amount of photocatalyst, pH of the solution, temperature of reaction medium, time of irradiation of light, the intensity of light, surface area of photocatalyst, dissolve oxygen in the reaction medium, nature of the photocatalyst, nature of the substrate, doping of metal ions and non metal and structure of photocatalyst and substrate. The photodegradation of organic compound have been studied by the several scientists and conclude the optimum conditions for the photodegradation of organic compound.The photodegradation of organic compounds was found maximum at low concentration of organic substrate with optimum amount of photocatalyst. The pH of the solution is also affect the photodegradation of organic substrate. The Titania show the maximum adsorption at low pH hence the photodegradation also found maximum at low pH. The surface area is the crucial factor for the photodegradation of organic substrate. If we are increasing the surface area of photocatalyst, the photodegradation of organic substrate increase. This is because that the number of active site increased with increasing the surface area. The amount of photocatalyst is the primary requirement of any photocatalysis process. The amount of photocatalyst should be optimum, if we take the high amount of photocatalyst the photodegradation is decreased, if we take the low amount of photocatalyst the photodegradation also decreased. The doping of metal ions and non-metal ions affect the photodegradation of organic substrate. Therefore, we have to use the metal ions which increased the positive charge on the surface of photocatalyst. The temperature and irradiation of light also affect the photodegradation of organic substrate. For the maximum photodegradation, the photocatalytic reaction should perform at room temperature not greater than 80 °C. The light of irradiation should be used which exit the electron easily from valence band to conduction band or equal to band gap energy. Keywords: A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials 2/10Copyright: ©2017 Kumar et al. for the removal of pollutants at high concentrations. The biological treatments are very slow, dispose large amount of sludge and required strict control of proper pH and temperature [21]. In this regard photo catalytic processes have advantages for the removal of pollutants even at low concentration for industrial waste water [22]. Moreover in photo oxidation, complete oxidation of organic pollutants take place within few hours, even at ppb level, without formation of secondary hazardous products using highly active and cheap catalysts which can be used in specially design reactor systems [23].Ti...

show abstract

“…Atmospheric aerosols that occur above heavily polluted areas are complex materials that have the potential to accelerate important ozone-forming reactions photocatalytically and possibly thermocatalytically (Zamaraev, et al,1994). In addition, there is abundant evidence for deleterious health effects from inhaled particles in this size range (Chemical and Engineering News, 1997).…”

Section: Journal Of Hazardous Substance Research Volume 1 1-6mentioning

confidence: 99%

“…The general role that photocatalytic particles play in global atmospheric chemistry has been reviewed by Zamaraev, et al (1994). The presence of a photocatalyst permits photoreactions to occur within the main spectral range of available sunlight.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric Nanoparticles in Photocatalytic and Thermal Production of Atmospheric Pollutants

Chianelli¹,

Yacamán²,

Arenas³

et al. 1998

Journal of Hazardous Substance Research

View full text Add to dashboard Cite

Atmospheric aerosols which occur above heavily polluted areas such as Mexico City, are characterized and found to be complex materials that have the potential to accelerate important ozone-forming reactions photocatalytically and thermocatalytically. In addition, because the particles are respirable, they may represent a considerable health hazard. The aerosols consist of two intermixed components. The first component consists of amorphous carbonaceous materials of variable composition with "fullerene like" materials dispersed throughout. The second component is an inorganic material consisting of nanoparticles of oxides and sulfides "supported" on clay minerals. This inorganic component has all of the characteristics of an airborne photocatalyst.Nanoparticles of Fe 2 O 3 , MnO 2 and FeS 2 have demonstrated catalytic properties, particularly when they occur in the nanoparticle range, as they do in the subject aerosol materials. These materials have band-gaps that occur in the broad solar spectrum enhancing the photocatalytic adsorption of solar radiation beyond that of the wider bandgap aluminosilicate and titanate materials, which also occur in aerosols. In addition, the materials are acidic and probably are coated with moisture when suspended in air, further enhancing their catalytic ability to crack hydrocarbons and create free radicals.

show abstract

Possible Impact of Heterogeneous Photocatalysis on the Global Chemistry of the Earth's Atmosphere

Cited by 61 publications

References 36 publications

Climate engineering by mimicking natural dust climate control: the iron salt aerosol method

Climate engineering by mimicking natural dust climate control: the iron salt aerosol method

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Atmospheric Nanoparticles in Photocatalytic and Thermal Production of Atmospheric Pollutants

Contact Info

Product

Resources

About