scholarly journals Oxidation of bisphenol-A by ozone microbubbles: Effects of operational parameters and kinetics study

2022 ◽  
pp. 102271
Author(s):  
Abdisa Jabesa ◽  
Pallab Ghosh
Keyword(s):  
Bisphenol A ◽  
Kinetics Study ◽  
Operational Parameters

Degradation of Bisphenol-A by Ozonation

2009 ◽  
Vol 12 (2) ◽  
Author(s):  
Isil Gultekin ◽  
Valko Mavrov ◽  
Nilsun H. Ince
Keyword(s):  
Bisphenol A ◽  
Mass Transfer Rate ◽  
Degradation Process ◽  
Bimolecular Reaction ◽  
Reaction Rate Constant ◽  
Operational Parameters ◽  
Endocrine Disrupting Compound ◽  
Ozone Addition ◽  
Endocrine Disrupting ◽  
Addition Rate

AbstractThe study reports the degradation of an endocrine disrupting compound- bisphenol A (BPA) by ozonation at slightly acidic pH with emphasis on the operational parameters (e.g. BPA concentration, ozone addition and mass transfer rate, contact time), reaction kinetics, rate constants and oxidation byproducts. It was found that the rate of BPA decay (pseudo-first order with respect to concentration) was accelerated with increased ozone addition rate and decreased BPA initial concentration. The profile of aqueous ozone concentration was such that it remained constant during 1-3 min of contact and increased thereafter. The bimolecular reaction rate constant was estimated using the steady state concentration of ozone and the value found was in good agreement with those reported in the literature for similar pH. Total mineralization was most rapid before complete conversion of BPA and much slower thereafter, implying low reactivity of the intermediate products with ozone. Mineralization was enhanced by alkalinization to pH 10.8, which facilitated the overall degradation process via the formation of radical species that were less selective than ozone. Byproducts of oxidation in successive order of formation were p-tert-butylphenol, hydroquinone, methyl-dihydrobenzofuran and n-butyl acetate, none of which are classified as endocrine disruptors.

scholarly journals Modeling and kinetics study of Bisphenol A (BPA) degradation over an FeOCl/SiO2 Fenton-like catalyst

2016 ◽  
Vol 276 ◽  
pp. 85-96 ◽  
Author(s):  
Xue-jing Yang ◽  
Xi-meng Xu ◽  
Xin-chao Xu ◽  
Jing Xu ◽  
Hua-lin Wang ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Kinetics Study

scholarly journals Sonochemical degradation of bisphenol A using persulfate activated by hematite nanoparticles (HNPs/PS)

2020 ◽  
Author(s):  
Mahboobeh Dehvari ◽  
Farshid Ghanbari ◽  
Mehdi Ahmadi
Keyword(s):  
Electron Microscopy ◽  
Bisphenol A ◽  
Oxygen Demand ◽  
Inhibitory Effect ◽  
Ultrasonic Power ◽  
Operational Parameters ◽  
Hematite Nanoparticles ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Mineralization Degree

Abstract In this study, hematite nanoparticles were used as persulfate activator for sonocatalytic degradation of bisphenol A (BPA). The physicochemical properties of the synthesized nanoparticles were investigated by X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM) analysis. The effect of different operational parameters such as pH, nanoparticle dosage, persulfate concentration, and ultrasonic power on catalytic activity were evaluated. The BPA degradation rate was improved when US irradiation was used simultaneously with HNPs for activating PS. According to the results, 98.94% of BPA (10 mg/L) was degraded within 15 min reaction time at 4 mM persulfate and 0.01 g/L α-Fe2O3 under ultrasonic irradiation of 250 W. The mineralization degree of BPA was determined by chemical oxygen demand (COD). 36.98% mineralization of BPA was achieved under optimum conditions. The quenching tests were done in the presence of different scavenger compounds. The results showed that both hydroxyl and sulfate radicals were reactive species in BPA degradation. According to the results of reusability test, the degradation efficiency was decreased to 86.34% indicating that HNPs can be recycled several times. Based on the results, all of the anions had the inhibitory effect on BPA degradation and most of the effect was related to hydrogen phosphate ions. The results showed that ultrasonic/hematite/ persulfate (US/HNPs/PS) process is an effective process for degradation of the organic pollutants.

Degradation of Bisphenol A by ozonation in rotating packed bed: Effects of operational parameters and co-existing chemicals

Chemosphere ◽  
2021 ◽  
Vol 274 ◽  
pp. 129769
Author(s):  
Lei Wang ◽  
Jimmy Yun ◽  
Hanxiao Zhang ◽  
Jianmeng Si ◽  
Xihong Fang ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Packed Bed ◽  
Operational Parameters ◽  
Rotating Packed Bed ◽  
Existing Chemicals

scholarly journals Anodic oxidation of Bisphenol A (BPA) by different dimensionally stable (DSA) electrodes

2021 ◽  
Author(s):  
Orhan T. Can ◽  
Muhammed M. Tutun ◽  
Ramazan Keyikoglu
Keyword(s):  
Bisphenol A ◽  
Current Density ◽  
Specific Energy Consumption ◽  
Mixed Metal Oxide ◽  
Operational Parameters ◽  
Boron Doped Diamond ◽  
Bdd Anode ◽  
Toc Removal ◽  
Boron Doped ◽  
A Current

Abstract Bisphenol A (BPA) is a known endocrine disrupter and was detected in surface waters. We investigated the mineralization of BPA by electrochemical oxidation. Six different types of electrodes including the boron-doped diamond (BDD), platinum (Pt), and mixed metal oxide (MMO) electrodes; RuO2-IrO2, RuO2-TiO2, IrO2-Ta2O5, and Pt-IrO2 were compared as the anode material. Total organic carbon (TOC) was performed to monitor the mineralization efficiency of BPA. BDD achieved 100% BPA mineralization efficiency in 180 min and at a current density of 125 mA/cm2. Whereas the TOC removal efficiency of Pt was 60.9% and the efficiency of MMO electrodes ranged between 48 and 54%. BDD exhibited much lower specific energy consumption (SEC), which corresponds to a lower energy cost (63.4 $/kg TOC). The effect of operational parameters showed that the BDD anode was much more affected by the current density, initial BPA concentration, and electrolyte concentration than the other parameters such as the stirring speed and interelectrode distance.

Probing the Chemistry and Spectroscopy of Radiation-Sensitive Polymers by Parallel-Detection EELS

1990 ◽  
Vol 48 (2) ◽  
pp. 34-35
Author(s):  
E. G. Rightor ◽  
G. P. Young
Keyword(s):  
Electron Beam ◽  
Bisphenol A ◽  
Energy Loss ◽  
Parallel Detection ◽  
Commercial Grade ◽  
Incident Electron Beam ◽  
Ptfe Sample ◽  
Spectroscopic Information ◽  
Edge Features ◽  
Electron Energy Loss

Investigation of neat polymers by TEM is often thwarted by their sensitivity to the incident electron beam, which also limits the usefulness of chemical and spectroscopic information available by electron energy loss spectroscopy (EELS) for these materials. However, parallel-detection EELS systems allow reduced radiation damage, due to their far greater efficiency, thereby promoting their use to obtain this information for polymers. This is evident in qualitative identification of beam sensitive components in polymer blends and detailed investigations of near-edge features of homopolymers.Spectra were obtained for a poly(bisphenol-A carbonate) (BPAC) blend containing poly(tetrafluoroethylene) (PTFE) using a parallel-EELS and a serial-EELS (Gatan 666, 607) for comparison. A series of homopolymers was also examined using parallel-EELS on a JEOL 2000FX TEM employing a LaB6 filament at 100 kV. Pure homopolymers were obtained from Scientific Polymer Products. The PTFE sample was commercial grade. Polymers were microtomed on a Reichert-Jung Ultracut E and placed on holey carbon grids.

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