http://publicationslist.org/data/meng.chong/ref-18/sdarticle.pdf

Recent Developments in Photocatalytic Water Treatment Technology: A Review

Decontamination and disinfection of water by solar photocatalysis: Recent overview and trends

Advanced oxidation processes (AOP) for water purification and recovery

Combination of Advanced Oxidation Processes and biological treatments for wastewater decontamination—A review

Advanced oxidation processes (AOPs) constitute a promising technology for the treatment of wastewaters containing non-easily removable organic compounds. Chlorophenols (CPs) are a group of special interest due to their high toxicity and low biodegradability. Data concerning the degradation of CPs by means of AOPs reported during the period 1995–2002 are evaluated in this work. Among the AOPs, the following techniques are studied: processes based on hydrogen peroxide (H2O2+UV, Fenton, photo-Fenton and Fenton-like processes), photolysis, photocatalysis and processes based on ozone (O3, O3+UV and O3+catalyst). Half-life times and kinetic constants for CP degradation are reviewed and the different mechanistic degradation pathways are taken into account.

Degradation of chlorophenols by means of advanced oxidation processes: a general review

Use of Fenton reagent to improve organic chemical biodegradability.

The existence or presence of diverse hydrocarbons and persistent pollutants in seawater or saline wastewater due to different industrial activities is considerable. The photo-Fenton process is suggested as a possible treatment, but the effect of salinity must be explored. An experimental design is carried out to elucidate the influence of NaCl on the efficiency of the process. According to the results, the global TOC removal is not influenced by the presence of chloride, but the process becomes much slower, even more than 10 times in some of the operating conditions. If solar irradiation is possible, photo-Fenton seems a good option to treat polluted water with high salinity.

Effect of Salinity on the Photo-Fenton Process

The degradation of nitrobenzene, a recalcitrant compound, using the combination of ozone with UV radiation and UV+Fe(III) has been carried out in a 21 L reactor and compared with results obtained from single ozonation. Whereas TOC elimination was not improved by using UV radiation, the addition of Fe(III) (O3/UV/Fe(III)) enhanced the mineralization rate. The principal effect of Fe(III) on the photolytic ozonation is attributed to the photodecarboxilation of ferric ion complexes.

UV- and UV/Fe(III)-enhanced ozonation of nitrobenzene in aqueous solution

The treatment of aqueous phenol (100 mg l −1 ) and nitrobenzene (50 mg l −1 ) solutions using iron(III) and UV radiation has been carried out. The quantum yield of photodegradation of both compounds has been determined ( φ phenol =11.2±2.0 mmol einstein −1 , φ NB =6.0±0.5 mmol einstein −1 ). The effect of the amount of ferric ion in the degradation rate has been studied in the range of molar iron(III) to organic compound ratios from 0 to 6. The reaction rate showed to follow a first-order kinetic with respect to the substrate and the kinetic constant depends on the Fe(III)/organic ratio. Optimal values of these kinetic constants have been found.

Iron(III) photoxidation of organic compounds in aqueous solutions

The influence of H 2 O 2 and Fe(III) in the degradation of nitrobenzene in aqueous solutions combined with UV radiation has been studied. A major efficiency is achieved when UV is combined with H 2 O 2 or Fe(III). Likewise, H 2 O 2 and Fe(III) concentration has an important effect on the degradation. Nitrophenol isomers are detected as the major intermediate products.

Esther Chamarro

Papers

Use of Fenton reagent to improve organic chemical biodegradability.

Effect of Salinity on the Photo-Fenton Process

UV- and UV/Fe(III)-enhanced ozonation of nitrobenzene in aqueous solution

Iron(III) photoxidation of organic compounds in aqueous solutions

Influence of H2O2 and Fe(III) in the photodegradation of nitrobenzene