Removal of an anionic dye (Acid Blue 92) by coagulation–flocculation using chitosan

Szygula, Agata; Guibal, Eric; Palacín, María Ariño; Ruiz, Magda; Sastre, Ana Marı́a

doi:10.1016/j.jenvman.2009.04.002

Cited by 251 publications

(135 citation statements)

References 41 publications

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“…[1][2][3] The conventional wastewater treatment applied for the degradation of these pollutants led to the transfer of one form of pollutant to another form, which are more toxic than that of the parent molecule. [4][5][6] Taking into account of the above problems, there is a need to develop a method that could signicantly degrade the pollutants present in wastewater. In this regard, the use of semiconductor based advanced oxidation processes (AOPs) has achieved signicant acceptance owing to their potential applicability to mineralize organic pollutants in aqueous suspensions.…”

Section: Introductionmentioning

confidence: 99%

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

et al. 2018

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Rare earth metal doping into semiconductor oxides is considered to be an effective approach to enhance photocatalytic activity due to its ability to retard the electron-hole pair recombination upon excitation.Herein, we report the synthesis of different rare earth metal (La, Nd, Sm and Dy)-doped ZnO nanoparticles using a facile sol-gel route followed by evaluation of their photocatalytic activity by studying the degradation of methylene blue (MB) and Rhodamine B (RhB) under UV-light irradiation.Different standard analytical techniques were employed to investigate the microscopic structure and physiochemical properties of the prepared samples. The formation of the hexagonal wurtzite structure of ZnO was established by XRD and TEM analyses. In addition, the incorporation of rare earth metal into ZnO is confirmed by the shift of XRD planes towards lower theta values. All metal doped ZnO showed improved photocatalytic activity toward the degradation of MB, of which, Nd-doped ZnO showed the best activity with 98% degradation efficiency. In addition, mineralization of the dye was also observed, indicating 68% TOC removal in 180 min with Nd-doped ZnO nanoparticles. The influence of different operational parameters on the photodegradation of MB was also investigated and discussed in detail.Additionally, a possible photocatalytic mechanism for degradation of MB over Nd-doped ZnO nanoparticles has been proposed and involvement of hydroxyl radicals as reactive species is elucidated by radical trapping experiments.

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Section: Introductionmentioning

confidence: 99%

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

et al. 2018

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“…It was procured from Sigma Aldrich, India. Many scientists were successfully utilized Chitosan as coagulant (Roussy et al, 2005;Szygla et al, 2009), adsorbent (Minamisawa et al, 2004;Gibbs et al, 2004) and with adsorbent (Huang and Chen, 1996).…”

Section: Chitosanmentioning

confidence: 99%

Comparison of naturally prepared coagulants for removal of COD and color from textile wastewater

Patel¹,

Vashi²

2013

Global NEST Journal

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The wastewater generated by the textile industry is rated as the most polluting among all industrial sectors considering both volumes discharged and effluent composition. Present investigation intended for COD and color removal from textile wastewater using naturally prepared coagulants i.e. Surjana Seed Powder (SSP), Maize Seed Powder (MSP) and Chitosan. Effect of coagulant dose, flocculation time and temperature has been studied. The Sludge Volume Index (SVI) and turbidity were examined for various effects. SSP was more effective than Chitosan and MSP for the removal of COD and color and also, Chitosan was more efficient than SSP and MSP considering SVI and turbidity. Maximum percentage reduction corresponds to 75.6 and 62.8 was obtained for removal of COD and color respectively, using SSP.

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“…So, these effluents must be treated before they reach the environment [27]. Various treatment technologies have been investigated extensively such as the photochemical oxidation [20], membrane [28], chemical coagulation [1,24], adsorption [13,16,19] aerobic and anaerobic biological processes [11,14], nano filtration [8,26], electrocoagulation, ultra-sonic decomposition [3], pre-dispersed solvent extraction [10], ozonation [4,22], colloidal gas aphrons [21] and liquid-liquid extraction [6,12]. Although the aforesaid physico-chemical methods are economical, they generate sludge which are difficult to dispose-off and these sludges are secondary pollutants.…”

Section: Introductionmentioning

confidence: 99%

Decolorization and Biodegradation of basic violet dye by fungal- bacterial consortia

Deivasigamni¹,

Prabavathy²

2017

JAC

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|V o l u m e 1 3 N u m b e r 3 J o u r n a l o f A d v a n c e s i n c h e m i s t r in ABSTRACTThe present study was aimed to test the ability of Penicillium citrinum MTCC 8009, Aspergillus terreus MTCC 3006, Bacillus cohnii and their consortia to decolorize basic violet dye. Different parameters such as initial dye concentration, dye to inoculum ratio and period of incubation were studied for the decolourization of the dye. The developed fungal-bacterial consortia exhibited maximum percent decolorization (92%) ability when compared to the treatment of dyes by individual microbes. Percent decolorization of basic violet dye (92%) was more efficient using fungal-bacterial (Penicillium citrinum and Bacillus cohnii) consortia than with individual cultures. Phyto-toxicity results indicated that bacterial-fungal consortia (Penicillium citrinum and Bacillus cohnii) treatment was believed to degrade the dyes to non-toxic intermediates. The FTIR analysis also revealed that decolorization of basic violet dyes was due to its degradation.

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Removal of an anionic dye (Acid Blue 92) by coagulation–flocculation using chitosan

Cited by 251 publications

References 41 publications

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

Comparison of naturally prepared coagulants for removal of COD and color from textile wastewater

Decolorization and Biodegradation of basic violet dye by fungal- bacterial consortia

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