Abstract
Frequency detection and environmental risk of Tetrabromobisphenol A （TBBPA）in aqueous system attracted many concerns. Nevertheless, mutual interactions between TBBPA and natural or synthetic chemical materials has not be clearly revealed. In this study, influential factors, adsorption behavior and mutual dynamism of active carbon (AC) and TBBPA were comprehensively explored. It was found that chemical sorption efficiency of AC reached more than 90%. The adsorption behavior can be depicted by Langmuir and Freundlich isotherms, whose kinetic could be well described by pseudo-first-order kinetic model. The chemisorption of AC is mainly single molecular layer mode for TBBPA adsorption, during which presence of SO42-, HCO3- and humic acid significantly inhibited TBBPA sorption capability. Proper temperature and pH promoted the adsorption efficiency of TBBPA. The obtained results demonstrated that AC adsorption is one feasible and effective technique for enhanced treatment technique for TBBPA containing wastewater.
Highlights
Considerable attention has been paid to Tetrabromobisphenol A (TBBPA, C15H12Br4O2, CAS Registration No.79-94-7), as its occurrence and transportation in water environment
TBBPA is one typical brominated flame retardants (BFRs) that has been widely used in the manufacture of printed circuit board (PCB), due to its advantages, eg. less additive dosage, good flame retardancy and thermal stability[1]
With the increase of temperature, the higher the adsorption efficiency and the faster the removal rate of TBBPA on the active carbon (AC) are, indicating that the adsorption of TBBPA on the AC is more favorable at mediumhigh temperature
Summary
Considerable attention has been paid to Tetrabromobisphenol A (TBBPA, C15H12Br4O2, CAS Registration No.79-94-7), as its occurrence and transportation in water environment. An effective treatment method for TBBPA removal in water is highly expected. After the wastewater containing TBBPA was treated by the wastewater treatment system, there are still many residues with rather low concentration (generally less than 10 ng L-1), which could not be effectively removed by traditional biological method and advanced oxidation process. Adsorption behavior of TBBPA by AC was explored and the effect of initial concentration, dosage of AC, system temperature, pH value, coexisting substances were examined. The results may insight that adsorption of TBBPA by AC is a feasible and effective technique and give technical support for the removal of typical BFRs in the existing wastewater treatment facilities and their upgrading
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