Optimisation of photo‐Fenton‐like degradation of aqueous polyacrylic acid using Box‐Behnken experimental design

Abstract

The effectiveness of photo-Fenton-like process to degrade aqueous polyacrylic acid (PAA) is investigated in a batch recirculation system using two photoreactors in series. The response surface methodology (RSM) using the Box-Behnken experimental design combined with quadratic programming is employed for the experimental design, the statistical analysis and the optimisation. The effects of the initial concentration of PAA, the initial concentration of H 2 O 2 :Fe 3þ , pH and the recirculation rate on the percent removal of total organic carbon (TOC)and the 'pseudo'-second order rate constant as the process responses are studied. The statistical analysis of the results indicates a satisfactory prediction of the system behaviour by the developed quadratic models. Optimum operating conditions to maximise the percent TOC removal are also determined.

Investigations on the dynamics of particle clouds in stagnant water using response surface methodology

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“…in Table 3 and estimated by trial and error, were found to be 1 Â 10 4 and 1 Â 10 2 1/(M s), respectively. [32] R4 [33] R5 [34] R6 10 1/(M s) [35] R7 [35] R8…”

“…AOPs produce highly reactive intermediates, mainly hydroxyl radicals ( . OH), which are able to oxidize most organics in water . During the UV photolytic process, the UV light with the wavelength energy of more than the bond energy can break the chemical bonds directly.…”

“…OH), which are able to oxidize most organics in water. [9][10] During the UV photolytic process, the UV light with the wavelength energy of more than the bond energy can break the chemical bonds directly. On the other hand, in the UV/H 2 O 2 process, the UV light at the wavelengths of 185 or 245 nm is combined with H 2 O 2 to generate .…”

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