Studies in surface chemistry of carbon blacks part III. Interaction of carbon blacks and aqueous bromine

✍ Scribed by Balwant Rai Puri; R.C. Bansal

• Publisher: Elsevier Science
• Year: 1966
• Tongue: English
• Weight: 501 KB
• Volume: 3
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(66)90039-x

✦ Synopsis

AM-Interaction

of carbon black and aqueous bromine involve8 conversion of the halogen into hydrobromic Acid a8 well a8 chemkorption or "iixation" by the carbon black. The amount converted varies with surface acidity of the black while the amount fixed varies with the amount of CO,-complex elimimsted during the history of formation of the black. Treatment of carbon black with nitric acid followed by evacuation increases bromine fixation capacity. It appear8 that the fixation of bromine take8 place at the aite8 vacated by the CO,-complex ; one molecule of b romine is fixed for every two moleculea of the complex eliminated. The degree of urmsturation in carbon black 8e.ems to be a definite quantity. Bromine is fkd 80 firmly that only about half of it is deaorbed as hydrobromic acid when the treated sample is outgaseed at 1200". The presence of bromine in carbon black8 raises sorption of moisture at all relative vapour pressures, the increase being about one molecule of water per atom of bromine. It also r&es the heat of immersion of carbon black in water.