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Nemat Jaafarzadeh,Farshid Ghanbari,Mahsa Moradi 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.3
We investigated the simultaneous application of peroxymonosulfate (PMS) and electrogenerated H2O2 inpresence of ultra violet (UV) to decolorize Acid Brown 14 (AB14). The effects of various operating parameters wereevaluated on performance of the hybrid system for decolorization and degradation of AB14. The results showed thatthe optimal conditions were at UV light intensity of 2.08mW/cm2, pH=4, 200 mA applied current and 3mM PMS. Moreover, presence of transitional metals (Co2+, Fe2+ and Cu2+) increased decolorization of AB14 significantly. Decolorizationwas promoted from 80.9% to 97% by addition of Fe2+ within 20 min reaction time. First-order model was fittedfor this system in absence and presence of Fe2+ with rate constants of 1.937×10−3 and 3.595×10−3 s−1 respectively. Scavengingexperiments confirmed that sulfate and hydroxyl radicals were equally effective in degradation of AB14. Thishybrid process increased the average oxidation state (AOS) from 0.2 to 2.3.
Ahmad Jonidi Jafari,Babak Kakavandi,Nemat Jaafarzadeh,Roshanak Rezaei Kalantary,Mehdi Ahmadi,Ali Akbar Babaei 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
Fenton-like catalytic degradation of tetracycline (TC) was studied by using ferro–ferric oxide (Fe3O4)nanoparticles coated on activated carbon (AC@Fe3O4) which acts as a peroxidase mimetic and persulfate(PS) as a green oxidant. Adsorption and degradation experiments were carried out in a batch system asfunctions of pH, PS, catalyst and TC concentrations. Kinetic and pathway of TC degradation by AC@Fe3O4/PS system was also investigated. Under the optimum conditions, the removal efficiency of TC and totalorganic carbon (TOC) were 99.8 and 50.6%, respectively. AC@Fe3O4 retained its activity and degradationefficiency remained even afterfive concessive cycles of use