Photochemical fate of a mixture of emerging pollutants in the presence of humic substances

Carlos, Luciano; Mártire, Daniel O.; González, Mónica C.; Gomis, J.; Bernabeu, A.; Amat, Ana M.; Arqués, A.

doi:10.1016/j.watres.2012.06.022

Cited by 124 publications

(61 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Its elucidation promotes development of effective and ecological methods for remediation of contaminated waters involving photoinduced detoxification of complex solutions (Carlosa et al 2012;Tchaikovskaya et al 2008Tchaikovskaya et al , 2007Chaikovskaya et al 2008;Bryantseva et al 2008).…”

Section: Humic Substances As Natural Detoxifying Agentsmentioning

confidence: 99%

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

Kudryasheva

Tarasova

2014

Environ Sci Pollut Res

View full text Add to dashboard Cite

The paper considers mechanisms of detoxification of pollutant solutions by water-soluble humic substances (HSs), natural detoxifying agents. The problems and perspectives of bioassay application for toxicity monitoring of complex solutions are discussed from ecological point of view. Bioluminescence assays based on marine bacteria and their enzymes are of special attention here; they were shown to be convenient tools to study the detoxifying effects on cellular and biochemical levels. The advantages of bioluminescent enzymatic assay for monitoring both integral and oxidative toxicities in complex solutions of model pollutants and HS were demonstrated. The efficiencies of detoxification of the solutions of organic oxidizers and salts of metals (including radioactive ones) by HS were analyzed. The dependencies of detoxification efficiency on time of exposure to HS and HS concentrations were demonstrated. Antioxidant properties of HS were considered in detail. The detoxifying effects of HS were shown to be complex and regarded as 'external' (binding and redox processes in solutions outside the organisms) and/or 'internal' organismal processes. The paper demonstrates that the HS can stimulate a protective response of bacterial cells as a result of (1) changes of rates of biochemical reactions and (2) stabilization of mucous layers outside the cell walls. Acceleration of auto-oxidation of NADH, endogenous reducer, by HS was suggested as a reason for toxicity increase in the presence of HS due to abatement of reduction ability of intracellular media.

show abstract

Section: Humic Substances As Natural Detoxifying Agentsmentioning

confidence: 99%

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

Kudryasheva

Tarasova

2014

Environ Sci Pollut Res

View full text Add to dashboard Cite

show abstract

“…Taking into consideration the results of the preliminary ultrafiltration runs (Table 1), the increased removal rate of ATR is likely due to the enhanced TiO 2 photocatalytic activity in the presence of HA in the feed solution. According to the literature, irradiated HA solutions can generate photochemical reactive intermediates (solvated electrons, hydroxyl radicals, singlet oxygen or substances in triplet states) which can also react with the target pollutants (Carlos et al, 2012). Moreover, the acceleration of ATR degradation may occur through a photosensitising THE EFFECT OF HUMIC ACIDS ON THE REMOVAL OF ATRAZINE 521 process mediated by the dissolved HA (Konstantinou et al, 2001).…”

Section: Resultsmentioning

confidence: 99%

The effect of humic acids on the removal of atrazine from water in a continuous photocatalytic membrane reactor

2014

Issue 3

View full text Add to dashboard Cite

This paper examines the effect of humic acids (HA) and other solution constituents (Ca 2+ , Mg 2+ , Na + ), frequently encountered in potable water sources, on the removal of a well-known herbicide, atrazine (ATR), by a laboratory-scale pilot Photocatalytic Membrane Reactor (PMR) system. Experimental results with different HA concentrations, in the presence (or not) of background cations, demonstrate the attainment of steady-state operation with constant degradation efficiencies and controlled membrane fouling phenomena. The excellent performance of the system is attributed to the efficient photocatalytic degradation of the dissolved organics, which is enhanced by steric interactions between the HA-ATR pseudo-complexes and the membrane. The successful laboratory tests hold promise for practical water treatment applications of the proposed PMR system.

show abstract

“…The decrease in the concentration of CAF on the other hand, (from an initial value of 3500 ppt; Fig. 5) may be attributed to photo-degradation (Carlos et al, 2012;Jacobs et al, 2012). For example, Jacobs et al (2012) reported that at environmentally relevant concentrations caffeine (CAF) photolysis was significantly increased by the presence of nitrate and dissolved humic materials resulting in a half-life for CAF of only 15-25 h. No defined trend was observed for SMX (Fig.…”

Section: Discussionmentioning

confidence: 96%

Puddles – A trigger for heterogeneous chemical influx into the unsaturated zone

et al. 2015

View full text Add to dashboard Cite

Photochemical fate of a mixture of emerging pollutants in the presence of humic substances

Cited by 124 publications

References 42 publications

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

The effect of humic acids on the removal of atrazine from water in a continuous photocatalytic membrane reactor

Puddles – A trigger for heterogeneous chemical influx into the unsaturated zone

Contact Info

Product

Resources

About