Removal of Color and Organic Matter in Industrial Phosphoric Acid by Ozone: Effect on Activated Carbon Treatment

Belfadhel, H.; Ratel, A.; Ouederni, Abdelmottaleb; Bès, René; Mora, J.

doi:10.1080/01919512.1995.10555775

Cited by 6 publications

(2 citation statements)

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“…The brown color of the powder after X‐ray radiation may indicate phosphoric acid (H 3 PO 4 ) formation. Pure phosphoric acid is a colorless compound, turning brown in media with organic compounds (in our case methylamine group) …”

Section: Resultsmentioning

confidence: 99%

Deciphering the Role of Impurities in Methylammonium Iodide and Their Impact on the Performance of Perovskite Solar Cells

Levchuk

Hou

Gruber

et al. 2016

Adv Materials Inter

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Solution‐based perovskite solar cell fabrication typically involves rather complex processing sequences to yield highest performance. While most studies concentrate on the exploration of processing conditions, the purity levels of common perovskite precursor solutions have been investigated and a number of impurities that are critically important toward controlling the crystallization of perovskites are found. In this study, an in‐depth chemical study of the possible impurities formed during CH3NH3I preparation is presented and their relevance on solar cell processing is revealed. A primary consideration is the chemical transformation of hypophosphorous acid, which plays the role of the stabilizer for HI. The detrimental role of the impurities is best demonstrated by comparing perovskite solar cell devices fabricated from impurity‐free precursors versus precursors containing different concentrations of impurities. Most interestingly, it is revealed that a certain concentration of impurities is detrimental to the growth of large‐grained crystals. PbHPO3 nanoparticles, which are formed after hypophosphorous acid transformation, actually cause crystal domain growth through serving as a nucleation center. This study gives valuable insight into the rate determining steps of perovskite crystal growth and further provides the basis for developing reliable and reproducible high‐performance recipes for perovskite solar cell processing.

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Section: Resultsmentioning

confidence: 99%

Deciphering the Role of Impurities in Methylammonium Iodide and Their Impact on the Performance of Perovskite Solar Cells

Levchuk

Hou

Gruber

et al. 2016

Adv Materials Inter

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“…It is only through absorption on activated carbon that the level of OM could be reduced to 80 % per 25 g/kg P 2 O 5 . The ozonation prior to adsorption enhances the efficiency of the activated carbon effect and decreases its specific consumption [159].…”

Section: Inorganic Productionsmentioning

confidence: 99%

Fields of Ozone Applications

Rakovsky¹,

Anachkov²,

Заиков³

2009

ChChT

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The powerful oxidative action of ozone provides basis for development of novel or improved technologies which are widely used in ecology and industry. Special attention is paid to purification of waste gases, water, and soils. The disinfection and cleaning of drinking and process water are considered in detail. Applications of ozone in chemical, pharmaceutical and perfume industries, cosmetics, cellulose, paper and sugar industries, flotation, microelectronics, and many others are also examined in the review

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Ozone Applications

Заиков

Rakovsky

Anachkov

2008

Kirk-Othmer Encyclopedia of Chemical Technology

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Ozone applications are based on the powerful oxidative action of ozone. The ozonolysis of chemical and biochemical compounds, as a rule, takes place with high rates at low temperatures and activation energies. This result provides a basis for the development of novel and improved technologies, which find wide application in ecology, chemical, pharmaceutical, cosmetics, cellulose, paper and sugar industries, microelectronics, and many others. This article focuses on technologies for purification of waste gases, water and soils, manufacture of polymer and inorganic materials, cleanup and preparation of surfaces for electronics, superconductors, and more.

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Removal of Color and Organic Matter in Industrial Phosphoric Acid by Ozone: Effect on Activated Carbon Treatment

Cited by 6 publications

References 0 publications

Deciphering the Role of Impurities in Methylammonium Iodide and Their Impact on the Performance of Perovskite Solar Cells

Deciphering the Role of Impurities in Methylammonium Iodide and Their Impact on the Performance of Perovskite Solar Cells

Fields of Ozone Applications

Ozone Applications

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