MnO2 efficiently removes indigo carmine dyes from polluted water

Lekshmi, K.P. Vidya; Yesodharan, Suguna; Yesodharan, E.P.

doi:10.1016/j.heliyon.2018.e00897

Cited by 27 publications

(17 citation statements)

References 68 publications

(131 reference statements)

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“…It is also noted that the rate of degradation of remazol black at 5 mg/L is greater than that of 25 mg/L. This result is in agreement with the previous one where we showed that when the dye concentration increased, then the pollutant load influenced the free radicals produced and therefore decreased the degradation of the dye [12,32].…”

Section: Kinetic Study Of Degradationsupporting

confidence: 93%

“…An increased number of dye molecules and insufficient concentration of the active radicals decreased the efficiency of the decomposition process [29][30][31]. Similar results were obtained for the degradation of indigo carmine with manganese dioxide [32]. Indeed, an increase in the initial concentration of dye would increase the pollutant load, leads the decrease in catalytic activity and also prolongs the degradation time [33].…”

Section: Influence Of Some Parameters On the Degradation Of Remazol Blackmentioning

confidence: 71%

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Degradation of Remazol Black dye from Aqueous Solution by Heterogeneous NH3(MoO3)3/H2O2 System

Urbain¹,

Ollo²,

Paul

et al. 2021

IRJPAC

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Aims: The pollution of the environment by organic dyes in water is a matter of great concern. Wastewater containing dyes is difficult to treat by conventional wastewater treatment methods such as coagulation, ozonation, biological treatment, etc. This is why the implementation of an effective method by not generating pollutants secondary is necessary. The objective of this work is to study the degradation of remazol black, an azo dye, by the coupling of hydrogen peroxide - molybdenum oxide nanoparticle. The nanoparticles were synthesized by the aqueous sol-gel method using a reflux assembly. Study Design: Random design. Methodology: The nanoparticles were synthesized by the aqueous sol-gel method using a reflux assembly and then characterized by X-ray diffraction and using software origin to determine the particles size by Scherrer's formula. The influence of hydrogen peroxide, molybdenum oxide and hydrogen peroxide / molybdenum oxide coupling, and the degradation kinetics of remazol black were studied. We also studied the influence of the pH of the solution, the mass of molybdenum nanoparticles and the concentration of remazol black on the dye degradation process. Results: The results showed that the synthesized oxide is ammonium molybdenum trioxide NH3(MoO3)3) with a hexagonal structure and size 22.79 nm. The study of the catalytic effect revealed a degradation rate of 17%, 0.83% and 42% respectively for H2O2, NH3(MoO3)3 and the coupling NH3(MoO3)3/H2O2. The study also showed that the degradation of remazol black by the couple NH3(MoO3)3 /H2O2 is better at pH = 4 and for a mass of nanoparticles of 400 mg. This degradation kinetics are pseudo 1st order. In addition, the degradation rate decreases when the concentration of remazol black increases. The efficiency of the coupling (NH3(MoO3)3 / H2O2 showed at ambient temperature, that it was possible to remove about 60% of the initial color of remazol black from the water in a batch reaction. Conclusion: The reflux method makes it possible to synthesize molybdenum nanoparticles. The molybdenum oxide hetero-Fenton process is effective in removing remazol black dye from water.

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Section: Kinetic Study Of Degradationsupporting

confidence: 93%

Section: Influence Of Some Parameters On the Degradation Of Remazol Blackmentioning

confidence: 71%

Degradation of Remazol Black dye from Aqueous Solution by Heterogeneous NH3(MoO3)3/H2O2 System

Urbain¹,

Ollo²,

Paul

et al. 2021

IRJPAC

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“…BNNS nanoparticles are in fact an excellent adsorbent for various organic pollutants predominantly due to its B-N bonds polarity which would favour the transfer of electrons with the aromatic organic molecules leading to physisorption reaction [5]. With the present of sodium salt (common cation in all cases was Na + ), anions could increase the adsorption capability of the humic acid onto the membrane [28]. It seems that one of its advantages had turned out to be a drawback if it were to be incorporated in the membrane matrix without prior modification.…”

Section: Resultsmentioning

confidence: 99%

Water transport properties of boron nitride nanosheets mixed matrix membranes for humic acid removal

Tang

Zulhairun

Wong

et al. 2019

Heliyon

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Ultrafiltration grade polysulfone-based mixed matrix membranes (MMMs) incorporated with two-dimensional boron nitride nanosheet (BNNS) was prepared via phase inversion method. The amount of BN incorporated was varied and the influence on membrane morphology, contact angle, surface charge, as well as water permeability and humic acid rejection were investigated. Results revealed that the addition of BN to the membrane matrix resulted in profound increase in water permeability (almost tripled to that of neat PSf) and humic acid rejection due to the increase in pore size and surface negative charge. Beyond the morphological changes imparted by the inclusion of BNNS, we postulated that the presence of BNNS within the membrane matrix also contribute to the enhancement in flux and rejection based on surface-slip and selective interlayer transport. Despite the favourable augmentation of water transport and filtration performance, the MMMs suffered with fouling problem due to the entrapment of foulant within the enlarged pores and the membrane valleys. Its inherent adsorptive character could be a disadvantage when utilized as membrane filler.

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“…[ 9 , 10 , 11 , 12 , 13 ]. In addition, MnO 2 can also be available for environmental technology such as dye degradation [ 14 , 15 ], wastewater treatment [ 16 , 17 ], photocatalytic degradation of organic pollutants [ 18 , 19 , 20 , 21 , 22 , 23 ], and photo-electrochemical hydrogen production [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO2 Nanoparticles—Decorated Activated Carbon Nanoflakes

et al. 2020

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In the present work, we demonstrated the upcycling technique of effective wastewater treatment via photocatalytic hydrogen production by using the nanocomposites of manganese oxide-decorated activated carbon (MnO2-AC). The nanocomposites were sonochemically synthesized in pure water by utilizing MnO2 nanoparticles and AC nanoflakes that had been prepared through green routes using the extracts of Brassica oleracea and Azadirachta indica, respectively. MnO2-AC nanocomposites were confirmed to exist in the form of nanopebbles with a high specific surface area of ~109 m2/g. When using the MnO2-AC nanocomposites as a photocatalyst for the wastewater treatment, they exhibited highly efficient hydrogen production activity. Namely, the high hydrogen production rate (395 mL/h) was achieved when splitting the synthetic sulphide effluent (S2− = 0.2 M) via the photocatalytic reaction by using MnO2-AC. The results stand for the excellent energy-conversion capability of the MnO2-AC nanocomposites, particularly, for photocatalytic splitting of hydrogen from sulphide wastewater.

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MnO2 efficiently removes indigo carmine dyes from polluted water

Cited by 27 publications

References 68 publications

Degradation of Remazol Black dye from Aqueous Solution by Heterogeneous NH3(MoO3)3/H2O2 System

Degradation of Remazol Black dye from Aqueous Solution by Heterogeneous NH3(MoO3)3/H2O2 System

Water transport properties of boron nitride nanosheets mixed matrix membranes for humic acid removal

Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO2 Nanoparticles—Decorated Activated Carbon Nanoflakes

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