Degradation of synthetic dye, Rhodamine B to environmentally non-toxic products using microalgae

Baldev, E.; MubarakAli, D.; Ilavarasi, A.; Pandiaraj, D.; Ishack, K.A. Sheik Syed; Thajuddin, Nooruddin

doi:10.1016/j.colsurfb.2013.01.008

Cited by 158 publications

(37 citation statements)

References 25 publications

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“…44 The above results indicate that the large conjugated chromophore structure of Ar−N(C 2 H 5 ) 2 as well as −C−O−C− bands are cleaved, generating primary amines and smaller carboxylic acid during the oxidative degradation of RhB. 43,46 Potential contribution of the Homo-EF process.-As discussed above, the catholyte pH decreased quickly to ca. 3.4 for 0.5 M MgSO 4 and increased quickly to ca.…”

Section: 36-38mentioning

confidence: 86%

“…The bands for original RhB consist of the peaks at 1597, 1476, 1413, and 1334 cm -1 , which are attributed to the stretching vibrations of C=C and −CH 2 − bonds in the aromatic ring, while the peaks at 1261, 1181, and 798 cm -1 were caused by alkyl halide, aryl−N stretching, and C−H deformation. [43][44][45] These characteristic peaks disappear after a 45 min reaction. The accompanying disappearance of the peaks at about 1413 and 1334 cm -1 indicates the total destruction of aromatic links, 44,45 and the new peaks observed at 1633 and 1394 cm −1 are due to the stretching vibrations of C=O and C−N bonds, respectively.…”

Section: 36-38mentioning

confidence: 99%

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FeOOH-Catalyzed Heterogeneous Electro-Fenton System upon Anthraquinone@Graphene Nanohybrid Cathode in a Divided Electrolytic Cell: Catholyte-Regulated Catalytic Oxidation Performance and Mechanism

Zhang

Zhou

Yang

2015

J. Electrochem. Soc.

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The aim of the present work was to illuminate the catholyte-regulated catalytic oxidation performance and mechanism of the FeOOH-catalyzed heterogeneous electro-Fenton (Hetero-EF) system operating in a divided electrolytic cell. Depending on pH evolution with electrolysis time, the effect of the catholyte type on the H 2 O 2 yield and current efficiency was investigated on an anthraquinone@electrochemically reduced grapheme oxide nanohybrid cathode. Based on the physicochemical characterization of the supported FeOOH nanoparticles, it was found that the Hetero-EF system exhibits the synchronous role of coupled adsorption and electrocatalytic oxidation for rhodamine B (RhB) degradation, with a higher apparent rate constant in MgSO 4 catholyte and a higher mineralization rate in Na 2 SO 4 catholyte. The catholyte-regulated catalytic oxidation mechanism was proposed according to radical scavenging experiments. In MgSO 4 catholyte, the Hetero-EF process follows a classic Haber-Weiss mechanism mediated by the dissolved iron ions and surface iron species to generate •OH, while in Na 2 SO 4 catholyte, the catalytic decomposition of H 2 O 2 by surface iron species and the deactivation of ≡Fe III -OH · H 2 O 2 complex to form HO In recent years, electrochemical advanced oxidation processes (EAOPs) have received increasing attention due their high effectiveness in the degradation of refractory organic pollutants via hydroxyl radicals (•OH) and superoxide radicals (O1-9 Brillas and coworkers have extensively reviewed the applications of EAOPs for the efficient degradation and mineralization of organic contaminants. [1][2][3][4] Among EAOPs, the electro-Fenton (EF) processes generally operate in two types of reactors, undivided cells and divided cells. The majority of studies have been performed in undivided electrochemical cells, 2 where the electrolysis requires a lower cell voltage because of the low voltage loss in the absence of separator. However, it is more difficult to discuss the oxidation mechanism of the EF process in an undivided cell due to the disturbance of reactive oxygen species and other weaker oxidants generated at the anodes.2 In comparison, divided cells are favorable for investigating the reaction mechanism of the EF process. Moreover, the current efficiency and H 2 O 2 yield are universally higher than those obtained in an undivided cell, 2,10 where the simultaneous anodic oxidation of the generated H 2 O 2 takes place.To overcome the defects of the homogeneous EF (Homo-EF) processes, heterogeneous electro-Fenton (Hetero-EF) processes have been developed over a wider applicable pH range. To date, three types of heterogeneous catalysts have been investigated in Hetero-EF system: (i) natural mineral, 11,12 (ii) supported transitional metal oxides, 13,14 [25][26][27][28] Of these, the polymorphs of FeOOH such as goethite (α-FeOOH), lepidocrocite (γ-FeOOH), akaganèite (β-FeOOH), and feroxyhyte (δ-FeOOH) have attracted great attention due to their outstanding catalytic properties, wide-operating pH range, ...

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Section: 36-38mentioning

confidence: 86%

Section: 36-38mentioning

confidence: 99%

FeOOH-Catalyzed Heterogeneous Electro-Fenton System upon Anthraquinone@Graphene Nanohybrid Cathode in a Divided Electrolytic Cell: Catholyte-Regulated Catalytic Oxidation Performance and Mechanism

Zhang

Zhou

Yang

2015

J. Electrochem. Soc.

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“…The two-step synthesis A series of ionic liquids 1-alkyl-3-methylimidazolium hexafluorophosphate were synthesized using a two-step method described in previous reports " [19], [20], [21], [22] 6 ) were synthesized following a procedure described the literature [27].…”

Section: Synthesis Offe 3 O 4 @Sio 2 @Ilmentioning

confidence: 99%

“…RhB is harmful if swallowed by human and animals, and causes irritation to the skin, eyes and respiratory tract " [2], [3], [4]", and has been considered and used as color additive in foodstuffs. Because of the low price and bright color of rhodamine B, some traders use it as a food additive illegally [5], harming the health of consumers [6]. Thus, due to this, it was considered worthwhile to make efforts to develop a simple method for the determination of RhB in different samples.…”

Section: Introductionmentioning

confidence: 99%

Determination of Rhodamine B Pigment in Food Samples by Ionic Liquid Coated Magnetic Core/Shell Fe3O4@SiO2 Nanoparticles Coupled with Fluorescence Spectrophotometry

Bakheet¹

2017

SJC

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“…There are several ways to remove RhB from wastewaters, including chemical oxidation, physico-chemical and biological processes. Some of these processes include filtration (Li et al, 2011;Xu et al, 2013), adsorption (Lacerda et al, 2015), advanced oxidation processes Ge, 2014) and biological treatment (Baldev et al, 2013). Among these, adsorption is an effective, cheaper and simple approach.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of hazardous dye Rhodamine B onto Brazilian natural bentonite

Zimmermann

Dotto

Kuhn

et al. 2016

IJETM

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Abstract:The potential of a Brazilian natural bentonite to remove Rhodamine B (RhB) dye from aqueous solutions was evaluated. The bentonite was characterised by X-ray diffraction, thermogravimetric analysis, particle size distribution and N 2 -adsorption isotherms. The adsorption of RhB onto bentonite was evaluated in batch system. The pH effect (2.5-10.5), kinetic curves and equilibrium isotherms (initial dye concentrations from 100 to 600 mg L -1 ) were studied at 25°C and 250 rpm. It was found that the Brazilian bentonite presented a mesoporous structure with surface area of 14.35 m 2 g -1and average pore size of 28 nm. The adsorption capacity remained practically 2 B.M. Zimmermann et al.constant from pH 2.5 to pH 10.5. The Elovich model was adequate to represent the adsorption kinetic curves. Langmuir and Freundlich models were suitable to represent the adsorption isotherm. The maximum adsorption capacity was 77.3 mg g -1 , obtained at 25°C, pH of 4.5 and adsorbent dosage of 500 mg L -1 . It was demonstrated that the Brazilian bentonite can be utilised as a promising adsorbent to remove RhB from aqueous solutions.

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Degradation of synthetic dye, Rhodamine B to environmentally non-toxic products using microalgae

Cited by 158 publications

References 25 publications

FeOOH-Catalyzed Heterogeneous Electro-Fenton System upon Anthraquinone@Graphene Nanohybrid Cathode in a Divided Electrolytic Cell: Catholyte-Regulated Catalytic Oxidation Performance and Mechanism

FeOOH-Catalyzed Heterogeneous Electro-Fenton System upon Anthraquinone@Graphene Nanohybrid Cathode in a Divided Electrolytic Cell: Catholyte-Regulated Catalytic Oxidation Performance and Mechanism

Determination of Rhodamine B Pigment in Food Samples by Ionic Liquid Coated Magnetic Core/Shell Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> Nanoparticles Coupled with Fluorescence Spectrophotometry

Adsorption of hazardous dye Rhodamine B onto Brazilian natural bentonite

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Degradation of synthetic dye, Rhodamine B to environmentally non-toxic products using microalgae

Cited by 158 publications

References 25 publications

FeOOH-Catalyzed Heterogeneous Electro-Fenton System upon Anthraquinone@Graphene Nanohybrid Cathode in a Divided Electrolytic Cell: Catholyte-Regulated Catalytic Oxidation Performance and Mechanism

FeOOH-Catalyzed Heterogeneous Electro-Fenton System upon Anthraquinone@Graphene Nanohybrid Cathode in a Divided Electrolytic Cell: Catholyte-Regulated Catalytic Oxidation Performance and Mechanism

Determination of Rhodamine B Pigment in Food Samples by Ionic Liquid Coated Magnetic Core/Shell Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;@SiO&lt;sub&gt;2&lt;/sub&gt; Nanoparticles Coupled with Fluorescence Spectrophotometry

Adsorption of hazardous dye Rhodamine B onto Brazilian natural bentonite

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Product

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Determination of Rhodamine B Pigment in Food Samples by Ionic Liquid Coated Magnetic Core/Shell Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> Nanoparticles Coupled with Fluorescence Spectrophotometry