Ultrasonic degradation of Rhodamine B in aqueous solution: Influence of operational parameters

Behnajady, Mohammad A.; Modirshahla, Nasser; Tabrizi, Samad Bavili; Molanee, S.

doi:10.1016/j.jhazmat.2007.07.019

Cited by 107 publications

(46 citation statements)

References 19 publications

(26 reference statements)

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“…www.advancedsciencenews.com www.clean-journal.com (iii) Oxidant dosage Another pivotal operating parameter which influences the production of active species in the heterogeneous photoFenton process is the initial oxidant concentration. This fact has been verified by different researchers, [38,39] who confer the substantial impact of oxidant during the Fenton degradation of various pollutants. The results obtained by varying initial HP and PMS concentration in the present reaction systems are shown in Figure 6.…”

mentioning

confidence: 59%

Spinel Ferrite Mediated Photo‐Fenton Degradation of Phenolic Analogues: A Detailed Study Employing Two Distinct Inorganic Oxidants

Sharma

Singhal

2017

CLEAN Soil Air Water

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The present work demonstrates the applicability of ferrites as photo-Fenton catalysts for deterioration of different phenolic derivatives. To analyze optimal reaction conditions, experiments are performed with four magnetic spinel ferrites MFe 2 O 4 (M ¼ Co, Cu, Ni, and Zn) and two inorganic oxidants, i.e., hydrogen peroxide (HP) and potassium peroxymonosulfate (PMS). The reactions are performed using p-nitrophenol as phenolic probe. CuFe 2 O 4 and CoFe 2 O 4 possessed excellent ability to activate HP and PMS, respectively, among all four synthesized catalysts. A noteworthy aspect of two oxidizing agents is that the concentration of PMS used during the reaction is four times less than HP. Further, the broad pH activity of PMS provides a significant advantage over HP. The optimal reaction conditions, when HP is the oxidant in the photo-Fenton degradation, are 0.50 g L À1 MFe 2 O 4 , pH 2.5, and 8.8 mM HP. Although PMS is active in a wide pH range (2-10), adequate reaction conditions are 0.50 g L À1 MFe 2 O 4 , natural pH, and 2.2 mM PMS.The photo-Fenton activity of ferrites is extended to the degradation of different nitro-and chloro-analogs of phenol (2-nitrophenol, 3-nitrophenol, 4-nitrophenol, 2,4-dinitrophenol, 2,4,6-trinitrophenol, 2-chlorophenol, 3-chlorophenol, 4-chlorophenol, 2,4-dichlorophenol) with only two ferrites (CuFe 2 O 4 and CoFe 2 O 4 ). A comparative study is performed with the two oxidants (HP and PMS) with positive results. Finally, stability and reusability of magnetic ferrites as catalysts are also studied to prove their use in phenolic solution treatment.

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mentioning

confidence: 59%

Spinel Ferrite Mediated Photo‐Fenton Degradation of Phenolic Analogues: A Detailed Study Employing Two Distinct Inorganic Oxidants

Sharma

Singhal

2017

CLEAN Soil Air Water

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“…This is mainly due to the increase in the concentration of hydroxyl radicals as an active species in this process. In other words, with the constant value of all parameters in these experiments with an increase in H 2 O 2 concentration, more hydroxyl radicals will be available for attacking PNP molecules 21,22 .…”

Section: Effect Of the Initial Concentration Of H 2 Omentioning

confidence: 98%

Photooxidative Removal of p-Nitrophenol by UV/H2 O2 Process in a Spinning Disk Photoreactor: Influence of Operating Parameters

Dadkhah¹

2017

Chem.Biochem.Eng.Q.

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In this paper, spinning disk photoreactor (SDP) has been used for the removal of a refractory pollutant, namely p-nitrophenol (PNP), in UV/H 2 O 2 process. The effect of various parameters such as the plate type in the SDP, concentration of oxidant (H 2 O 2 ), fluid volume, initial concentration of PNP, distance of the lamps from the spinning disk, distance of the lamps from each other, pH, and rotation speed of the spinning disk in the removal efficiency has been investigated. The results indicated that the use of scrobiculate disc instead of flat disc significantly increased the removal percentage of PNP from 46 to 100 % for the irradiation time of 20 min; it also increased with increasing H 2 O 2 concentration, but the increase in fluid volume and the initial concentration of PNP reduced the removal percentage of PNP in the SDP. The increase in the distance of UV lamps from each other and from disc surface in the SDP reduced the removal percentage of PNP. However, the increase in pH to 5.5 increased removal efficiency while increasing pH above 5.5 reduced PNP removal efficiency. The disk rotation speed from 0 to 90 rpm increased the removal percentage from 49 to 70 % for the irradiation time of 5 min, but increasing the rotation speed to more than 90 rpm reduced the removal efficiency.

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“…Fig. 7 indicates that during the sonolysis of Rh B, N-deethylation (pathway 2) and cleavage of aromatic chromophore ring structure (pathway 1), but decomposition of aromatic structure is predominant (Behnajady et al, 2008). Rh B on sonication may follow the path 1 to form four N-deethylated intermediates namely, N,N-diethyl-N ′ -ethylrhodamine (DER), N,Ndiethylrhodamine (DR), N-ethylrhodamine (ER), and rhodamine (R) that further degrade to form cleavage chromophores, i.e.…”

Section: Mechanism Of Sonocatalytic Degradationmentioning

confidence: 99%

Synthesis of α-Bi4V2O11 and its Sonocatalytic Activity for the Degradation of Rhodamine B

Kumar¹,

Sahare²

2014

JLA

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A simple method for preparing highly sonoactive nano-sized bismuth vanadate (α-Bi4V2O11) was prepared by combustion technique. The prepared α-Bi4V2O11 powders were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). High-resolution TEM images displayed well defined Braggs planes having interplaner distances (dhkl) 3.04Å and 3.12Å, which were in good agreement with the (025) at 2θ = 30.56 o and (133) at 2θ = 28.04 o planes observed in the XRD pattern of monoclinic α-phase of bismuth vanadate respectively. The ultrasonic degradation of Rhodamine B (Rh B) was studied in the absence of catalyst and in the presence of catalyst. The rate of degradation of catalyzed reaction was higher than that obtained with in the absence of the catalysts. The observed pseudo-first-order rate constant increased from 0.010 min -1 to 0.017 min -1 as the concentration of catalyst Rh B increased from 0.03 mg/ml to 0.33 mg/ml. The possible reaction mechanism of sonocatalytic degradation of Rh B over α-Bi4V2O11 has also been discussed. Thus, in this paper we have concluded that bismuth vanadate is a stable and efficient catalyst for the industrial waste-water treatment.

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Ultrasonic degradation of Rhodamine B in aqueous solution: Influence of operational parameters

Cited by 107 publications

References 19 publications

Spinel Ferrite Mediated Photo‐Fenton Degradation of Phenolic Analogues: A Detailed Study Employing Two Distinct Inorganic Oxidants

Spinel Ferrite Mediated Photo‐Fenton Degradation of Phenolic Analogues: A Detailed Study Employing Two Distinct Inorganic Oxidants

Photooxidative Removal of p-Nitrophenol by UV/H2 O2 Process in a Spinning Disk Photoreactor: Influence of Operating Parameters

Synthesis of α-Bi4V2O11 and its Sonocatalytic Activity for the Degradation of Rhodamine B

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