30 research outputs found
Transformationen von N-Heteroarylformamidinen und N-Heteroarylformamidinoximen. Neue Synthesen und Transformationen von Oxazolo[5,4—c]pyridazinen
The relevance of bisphenol A adsorption during Fenton's oxidation
The aim of this research was to assess the efficiency of Fenton's
oxidation for degradation of endocrine disruptor bisphenol A (BPA) with
emphasis on extent of accompanying adsorption. Adsorption on the waste
sludge resulting from the Fenton's oxidation could represent a
significant impact on the final removal efficiency of BPA. Fenton's
oxidation was accomplished at two con- centrations of BPA (0.228 and
22.8 mg L-1); both at the selected molar ratio of reagents
Fe2+:H2O2(1:10), as a function of reaction time. The kinetics of
adsorption of BPA on waste sludge was determined for the same two
concentrations of BPA at two concentrations of waste sludge (0.1 and
6.0 g L-1). In addition to changing concentrations of BPA and sludge,
the adsorption process was also influenced by parameters such as
temperature, pH and contact time. Adsorption isotherms were determined.
Oxidation and adsorption were monitored by gas chroma- tography
combined with mass spectrum. It has been con- firmed that BPA is not
completely oxidized in Fenton's oxidation, because it is adsorbed to
formed waste ferric sludge and thus necessary precautions for sludge
deposition must be observe