Degradation pathways of crystal violet by Fenton and Fenton-like systems: Condition optimization and intermediate separation and identification

Fan, Huan‐Jung; Huang, Shih‐Yu; Chung, Wen‐Hsin; Jan, Jeng-Lyan; Lin, Wan‐Yu; Chen, Chiing‐Chang

doi:10.1016/j.jhazmat.2009.06.117

Cited by 199 publications

(97 citation statements)

References 61 publications

(76 reference statements)

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“…10 mg L -1 of CV dye at natural pH (pH = 6.4) was introduced into HPLC-MS. Five degradation byproducts were originated; N-methyl aniline, N,N-dimethyl aniline, 4-methyl-N,N-dimethylaniline, 4-dimethylamino phenol, and 4-dimethylamino benzoic acid. Fan and co-workers [24] also investigated similar byproducts during degradation of CV dye by Fenton processes. The formation of these by-products suggests that during degradation of CV dye, the main specie involve in the degradation process is…”

Section: Degradation Pathway Of CV Dyementioning

confidence: 99%

Removal of Crystal Violet Dye From Aqueous Solution by Gamma Irradiation

Rehman

Sayed

Khan

et al. 2017

J. Chil. Chem. Soc.

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In this study the radiation-induced degradation of crystal violet (CV) dye under various experimental conditions has been investigated. D 0.5 , D 0.9 and D 0.99 values suggests that lower doses are required for 50%, 90% and 99% removal of CV dye when the sample solution contains excessive amount of• OH radicals. The removal efficiency of CV dye in terms of G-values was also calculated under each reaction conditions. The results showed that• OH radicals are playing effective role in the degradation of CV dye as compared to e aq -and • H radicals. The gamma irradiation process effectively degraded CV dye at all pH values. The organic byproducts were examined and accordingly degradation pathway was proposed.

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Section: Degradation Pathway Of CV Dyementioning

confidence: 99%

Removal of Crystal Violet Dye From Aqueous Solution by Gamma Irradiation

Rehman

Sayed

Khan

et al. 2017

J. Chil. Chem. Soc.

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“…Regardless of this drawback, taking into account the analysis of previous investigations [35][36][37][38], a reaction pathway for the degradation of CV dye could be proposed. The suggested reaction scheme is elaborated in Figure 7.…”

Section: Determination Of Rate Constantsmentioning

confidence: 99%

Photocatalytic degradation of crystal violet by thiourea-doped TiO2 thin film fixed bed photoreactors under visible irradiation: Optimisation using central composite designs and kinetics studies by multivariate curve resolution

Khalilian¹,

Semnani²,

Nekoeinia³

2018

Bull. Chem. Soc. Eth.

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ABSTRACT. In this study, optimisation of the photocatalytic behaviour of crystal violet (CV) by thiourea (Tu)-codoped TiO2 thin film in fixed bed photoreactor was investigated by central composite designs (CCDs). The effective variables were pH, the concentration of CV dye, flow rate and reaction time. The results of the CCD model showed a good agreement with experimental results, with R 2 = 0.9680 (p < 0.0001) and maximum degradation efficiency was obtained at the optimum conditions: dye concentration 8.5 mg/L, pH 9, flow rate 6 mL/min and reaction time 80 min. Subsequently, three absorbing chemical compounds presented in the degradation reaction were obtained by using singular value decomposition (SVD) method and evolving factor analysis (EFA). Then a multivariate curve resolution with alternating least squares (MCR-ALS) was performed to achieve the concentration and spectral profiles for each component. Finally, a hard modelling method was applied to determine the kinetic constants of distinct reactions occurred in the photocatalytic degradation process. The reaction rate constants were calculated for the first and second steps as k1 = 0.08327 (SD = ±0.0015) /min and k2 = 0.045 (SD = ±0.0006)/min, respectively.

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“…Apart from this, the Fenton process could also be applied as an effective pretreatment method to improve the ratio of BOD to COD (B/C) for the WW (i.e., degrading bio-refractory pollutants to intermediate(s) that can be degraded biologically and be less toxic to microorganisms [107]). Meanwhile, researchers also found that the optimum pH should be always kept at 3 [108][109][110],…”

Section: Mw-fenton/fenton-like Processmentioning

confidence: 99%