Phenol degradation by Fenton-like process

Abstract

The main objective of this study was to investigate the optimum conditions for the Fenton-like process on phenol degradation, using Mn(2+) as a supporting catalyst in the Fenton reaction. The effect of the independent factors [H2O2], [Fe(2+)], [Mn(2+)] and t (reaction time) was evaluated on the efficiency of phenol degradation at two pHs (3 and 5). The experimental arrangement adopted was the Box-Behnken delineation, with the phenol concentration after the treatments suggested as response variable. At less acidic pH (5), regardless of [Mn(2+)], it was observed that the conventional Fenton process was the most efficient alternative, considering the optimum condition: 2.65 mmol L(-1) for [H2O2], 0.36 mmol L(-1) for [Fe(2+)], and 90 min for t. It was observed that the addition of Mn(2+) helped the phenol degradation at more acidic pH (3), obtaining the optimum condition: 6.17 mmol L(-1) for [H2O2], 0.36 mmol L(-1) for [Fe(2+)], 1.09 mmol L(-1) for [Mn(2+)], and 90 min for t.

Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid

“…The whole process was reversible and easy to regenerate [ 39 , 52 , 53 ]. The separation and degradation method of the degraded products of phenol, p-isopropyl phenol, and BPA had been widely studied, such as photocatalytic degradation [ 54 , 55 ], Fenton process [ 56 , 57 ], sonochemical degradation [ 58 ], and so on. The mechanism of these reactions was advanced oxidation reactions, which has some similarities with the electrocatalytic reaction mechanism of heteropoly acid.…”

Investigating crystal plane effect of Co3O4 with various morphologies on catalytic activation of monopersulfate for degradation of phenol in water

“…For instance, hexamethylenetetramine was employed here for preparing Co3O4-NP as hexamethylenetetramine is a strong chelating ligand and has been unveiled as a molecular building block for self-assembled molecular crystals, facilitating the growth of sheet-like morphology [9]. In the case of Co3O4-NB, ethylene glycol was particularly used as ethylene glycol serves as a rate-controlling agent, producing a rod-like precursor of cobalt hydroxide carbonate [10]. On the other hand, an oxidant, H2O2, was particularly added in the case of Co3O4-NC as H2O2 would oxidize Co 2+ into Co 3+ , anions in solutions would be then intercalated into the inter-layered space to compensate the extra positional charge inferred by Co 3+ cations, resulting the nanoscale cubic morphology [11].…”

“…However, due to its low biodegradability and toxicity [3], elimination of phenol would usually necessitate more intensive physico-chemical processes to avoid adverse effects of phenol on the environment and ecology. Therefore, several techniques have been proposed to eliminate phenol from polluted water, including membrane filtration [2], adsorption [4], photo-degradation [5], and chemical oxidation [6][7][8][9][10]. Among these techniques, chemical oxidation appears as the most useful one because chemical oxidation can rapidly oxidize organic pollutants, leading to decomposition of phenol, and thus chemical oxidation receives growing interests for phenol degradation.…”

Degradation of BTEX in groundwater by nano-CaO2 particles activated with L-cysteine chelated Fe(III): enhancing or inhibiting hydroxyl radical generation

“…The main reason was that the initial pH of the actual groundwater was nearly neutral (7.31 + 0.2) and it had a strong buffer capacity which could maintain the pH without large change during the reaction. As the Fenton reaction is affected by the pH of the solution (Sarmento et al 2016), the effect of initial solution pH on BTEX degradation was investigated and the results are shown in the Supplementary Materials (Fig. S3a).…”