Destruction of microcystins by conventional and advanced oxidation processes: A review

Sharma, Virender K.; Triantis, Theodoros M.; Antoniou, Maria G.; He, Xuexiang; Pelaez, Miguel; Cui, Han; Song, Weihua; Ο'Shea, Kevin Ε.; Cruz, Armah A. de la; Kaloudis, Triantafyllos; Hiskia, Anastasia; Dionysiou, Dionysios D.

doi:10.1016/j.seppur.2012.02.018

Cited by 193 publications

(94 citation statements)

References 123 publications

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“…Advanced oxidation processes are based on the production in situ of free oxidizing radical species mainly hydroxyl radicals (HO • ). These radicals can be generated by chemical (Fenton (H 2 O 2 /Fe 2+ ) [11] [12], ozonation at alkaline medium [13], peroxonation (O 3 /H 2 O 2 ) [14], photochemical UV/TiO 2 [15] [16] UV/H 2 O 2 [17] [18], UV/O 3 [19], photo-Fenton UV/H 2 O 2 /Fe 2+ [20] [21], and electrochemical (anodic oxidation, electro-Fenton) [22] [23]. Hydroxyl radicals are powerful oxidants (E˚ = 2.80 V/NHE), which react immediately and non-selectively with organic pollutants in water which leads in most cases to a complete mineralization these compounds or to transform them into readily biodegradable compounds.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Degradation of Triazine Herbicides in Water by Photo-Fenton Process

Dbira¹,

Boutarfaïa²,

Bensalah³

2014

AJAC

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In this work, the degradation of 2-chloro-4,6-diamino-1,3,5-triazine in aqueous solutions by photo-Fenton process has been investigated. The preliminary results have shown that the degradation of 2-chloro-4,6-diamino-1,3,5-triazine by photo-Fenton process is more rapid and more effective than Fenton and UV/H2O2 processes. The effects of certain experimental parameters on kinetics and efficiency of the degradation of 2-chloro-4,6,-diamino-1,3,5-triazine by photo-Fenton process, have been evaluated. Under optimal conditions, photo-Fenton process achieved more than 90% of chloride release and about 30% of nitrate formation. The results of total organic carbon (TOC) and total Kjeldahl nitrogen (TKN) analyses have shown that no carbon dioxide and ammonia are formed during photo-Fenton treatment of aqueous solutions containing 40 mg/L triazine. These results indicate that only substituent groups of triazine ring are released; however, nitrogen atoms of triazine ring remain unaffected. A simple mechanism of degradation of 2-chloro-4,6-diamino-1,3,5-triazine has been proposed. The degradation starts by a rapid release of chlorine atoms as chloride ions to form 2-hydroxy-4,6-diamino-1,3,5-triazine. The amino groups of 2-hydroxy-4,6-diamino-1,3,5-triazine undergo are oxidized into nitro groups by hydroxyl radicals to form 2-hydroxy-4,6-dinitro-1,3,5-triazine which undergoes a slow release of nitro groups and their substitution with hydroxyl groups to form cyanuric acid and nitrate ions. The degradation of cyanuric acid by photo-Fenton process has also been investigated. The results of TOC and TKN analyzes show that no carbon dioxide is formed during the treatment.

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Section: Introductionmentioning

confidence: 99%

Investigations on the Degradation of Triazine Herbicides in Water by Photo-Fenton Process

Dbira¹,

Boutarfaïa²,

Bensalah³

2014

AJAC

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“…The tremendous promise of AOPs has resulted in a major demand of nanophotocatalysts because photocatalysis is among the most popular AOPs [61][62][63][64].…”

Section: Photo-degradation Of Pollutants and Hazardous Compoundsmentioning

confidence: 99%

“…The main industrial applications of TiO 2 -based photocatalysts is for the degradation of dyes used in the textile industry [64], expired pharmaceutical compounds (drugs) [65], spills of toxic compounds like pesticides [66], natural toxins like cyanobacterial toxin microcystin-LR [61], and personal care products (such as a series of parabens) [67]. Such nanophotocatalysts have also been used for the treatment of winery wastewater using a photocatalytic reactor [68].…”

Section: Photo-degradation Of Pollutants and Hazardous Compoundsmentioning

confidence: 99%

Industrial synthesis and characterization of nanophotocatalysts materials: titania

Ramos-Delgado

Gracia-Pinilla

Mangalaraja

et al. 2016

Nanotechnology Reviews

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Despite the recent synthesis and identification of a diverse set of new nanophotocatalysts that has exploded recently, titanium dioxide (TiO 2 ) remains among the most promising photocatalysts because it is inexpensive, non-corrosive, environmentally friendly, and stable under a wide range of conditions. TiO 2 has shown excellent promise for solar cell applications and for remediation of chemical pollutants and toxins. Over the past few decades, there has been a tremendous development of nanophotocatalysts for a variety of industrial applications (i.e. for water purification and reuse, disinfection of water matrices, air purification, deodorization, sterilization of soils). This paper details traditional and new industrial routes for the preparation of nanophotocatalysts and the characterization techniques used to understand the physical chemical properties of them, like surface area, ζ potential, crystal size, and phase crystallographic, morphology, and optical transparency. Finally we present some applications of the industrial nanophotocatalysts.

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“…A more recent MC contamination event in the public water system of Toledo, OH (USA), caused a drinking water crisis that impacted about a half million residents (reported by NBC News). Over 90 variants of MCs have been identified so far (3,5), among which microcystin-LR (MC-LR) is the most common and toxic. MC-LR accounts for 45.5 to 99.8% of the MCs in bloom-impacted natural waters (6) and 57% of MCs produced by Microcystis aeruginosa cultures (7).…”

mentioning

confidence: 99%

“…MC-LR accounts for 45.5 to 99.8% of the MCs in bloom-impacted natural waters (6) and 57% of MCs produced by Microcystis aeruginosa cultures (7). Therefore, MC-LR often serves as the model for studies related to microcystin production, degradation, and toxicity (2,(4)(5)(6)(7)(8).…”

mentioning

confidence: 99%

Algicidal Activity of Streptomyces eurocidicus JXJ-0089 Metabolites and Their Effects on Microcystis Physiology

Zhang

Ding

et al. 2016

Appl Environ Microbiol

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Copper sulfate (CuSO 4 ) has been widely used as an algicide to control harmful cyanobacterial blooms (CyanoHABs) in freshwater lakes. However, there are increasing concerns about this application, due mainly to the general toxicity of CuSO 4 to other aquatic species and its long-term persistence in the environment. This study reported the isolation and characterization of two natural algicidal compounds, i.e., tryptamine and tryptoline, from Streptomyces eurocidicus JXJ-0089. At a concentration of 5 g/ml, both compounds showed higher algicidal efficiencies than CuSO 4 on Microcystis sp. FACHB-905 and some other harmful cyanobacterial strains. Tryptamine and tryptoline treatments induced a degradation of chlorophyll and cell walls of cyanobacteria. These two compounds also significantly increased the intracellular oxidant content, i.e., superoxide anion radical (O 2 ؊ ) and malondialdehyde (MDA), but reduced the activity of intracellular reductants, i.e., superoxide dismutase (SOD), of cyanobacteria. Moreover, tryptamine and tryptoline treatments significantly altered the internal and external contents of microcystin-LR (MC-LR), a common cyanotoxin. Like CuSO 4 , tryptamine and tryptoline led to releases of intracellular MC-LR from Microcystis, but with lower rates than CuSO 4 . Tryptamine and tryptoline (5 g/ml) in cyanobacterial cultures were completely degraded within 8 days, while CuSO 4 persisted for months. Overall, our results suggest that tryptamine and tryptoline could potentially serve as more efficient and environmentally friendly alternative algicides than CuSO 4 in controlling harmful cyanobacterial blooms. IMPORTANCECyanobacterial harmful algal blooms (CyanoHABs) in aquatic environments have become a worldwide problem. Numerous efforts have been made to seek means to prevent, control, and mitigate CyanoHABs. Copper sulfate (CuSO 4 ), was once a common algicide to treat and control CyanoHABs. However, its application has become limited due to concerns about its general toxicity to other aquatic species and its long-term persistence in the environment. There is a great need for algicides with higher specificity and low environmental impacts. This study reports the isolation and characterization of two natural algicidal compounds from a streptomycete strain, Streptomyces eurocidicus JXJ-0089. Our results suggest that the identified algicides could potentially serve as more efficient and environmentally friendly alternative algicides than CuSO 4 in controlling harmful cyanobacterial blooms. Harmful cyanobacterial blooms (CyanoHABs) have become a global phenomenon and are occurring with increasing intensity, area of infection, and frequency (1). One danger that CyanoHABs have posed to the environment and human health is the production and release of cyanotoxins. The most frequently detected cyanotoxins in freshwater systems are microcystins (MCs), a group of potent liver toxins (2, 3). An MC contamination incident in 1996 caused the death of 53 patients in Caruaru, Brazil (4). A more recent MC c...

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Destruction of microcystins by conventional and advanced oxidation processes: A review

Cited by 193 publications

References 123 publications

Investigations on the Degradation of Triazine Herbicides in Water by Photo-Fenton Process

Investigations on the Degradation of Triazine Herbicides in Water by Photo-Fenton Process

Industrial synthesis and characterization of nanophotocatalysts materials: titania

Algicidal Activity of Streptomyces eurocidicus JXJ-0089 Metabolites and Their Effects on Microcystis Physiology

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