Intermolecular mechanistic treatment of recalcitrant environmental pollutants: Azo, benzene, naphthalene and vinyl sulfone

Lau, Yen-Yie; Wong, Yee‐Shian; Ong, Soon‐An; Ho, Li-Ngee; Kamarudin, Hussin; Lutpi, Nabilah Aminah

doi:10.1016/j.jtice.2017.04.009

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…The absorption peak was mainly expressed as C O or C N bond, indicating the possibility of producing ketones or acids. 6 When the reaction time increased from 0 to 30 min, the intensity of absorption peak gradually increased, then it decreased step by step when the reaction proceeded from 30 to 180 min.…”

Section: Resultsmentioning

confidence: 96%

“…4(b) ), it could be seen clearly that the absorption peaks of the ultraviolet region at 230, 258 and 285 nm were characteristic peaks of benzene ring, –NH 2 and –OCH 3 , respectively. 6 The absorption peak at 450 nm corresponded to the –NO 2 chromophore, produced by n → π* transition, namely, the visible chromophore.…”

Section: Resultsmentioning

confidence: 99%

“…Adsorption method is not cost effective, not easy to be regenerated and only move the pollutants from the water phase to absorbents, which is not a complete treatment method. 6,20 Biodegradation is usually slower and with less shock resistant. 21 Therefore, it is necessary to nd a more effective way to treat the wastewater of BDIs.…”

Section: 14mentioning

confidence: 99%

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Study on the degradation mechanism and pathway of benzene dye intermediate 4-methoxy-2-nitroaniline via multiple methods in Fenton oxidation process

et al. 2018

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Benzene dye intermediate (BDI) 4-methoxy-2-nitroaniline (4M2NA) wastewater has caused significant environmental concern due to its strong toxicity and potential carcinogenic effects. Reports concerning the degradation of 4M2NA by advanced oxidation process are limited. In this study, 4M2NA degradation by Fenton oxidation has been studied to obtain more insights into the reaction mechanism involved in the oxidation of 4M2NA. Results showed that when the 4M2NA (100 mg L À1) was completely decomposed, the TOC removal efficiency was only 30.70-31.54%, suggesting that some by-products highly recalcitrant to the Fenton oxidation were produced. UV-Vis spectra analysis based on Gauss peak fitting, HPLC analysis combined with two-dimensional correlation spectroscopy and GC-MS detection were carried out to clarify the degradation mechanism and pathway of 4M2NA. A total of nineteen reaction intermediates were identified and two possible degradation pathways were illustrated.Theoretical TOC calculated based on the concentration of oxalic acid, acetic acid, formic acid, and 4M2NA in the degradation process was nearly 94.41-97.11% of the measured TOC, indicating that the oxalic acid, acetic acid and formic acid were the main products. Finally, the predominant degradation pathway was proposed. These results could provide significant information to better understand the degradation mechanism of 4M2NA.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Study on the degradation mechanism and pathway of benzene dye intermediate 4-methoxy-2-nitroaniline via multiple methods in Fenton oxidation process

et al. 2018

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“…The intensity of this peak decreased gradually and disappeared after 240 min of irradiation, indicating that a complete decolorization was achieved. The three absorption peaks observed in the UV region of the spectrum located at λ = 260 nm, λ = 310 nm, and λ = 392 nm were attributed to the benzene ring, vinyl sulfone, and naphthalene ring of RB5, respectively [25][26][27]. The naphthalene ring was more slowly degraded compared with the benzene ring and vinyl sulfone moieties of RB5, indicating much more stability in the photocatalytic system.…”

Section: Uv-vis and Fluorescence Spectroscopic Analyses Of Rb5 Degrad...mentioning

confidence: 98%

“…The -N=N-azo chromophores of RB were represented by the band at 1487 cm −1 , and the S=O stretching vibration band located at 1049 cm −1 belonged to the sulfonated group of its auxochrome. The main characteristic bands of RB5 at ~3512 cm −1 , 1342 cm −1 , and 1130 cm −1 were attributed to N-H stretching in the amines, as well as the -C-O-and -CN groups of aromatic amines, respectively [25,30]. The band related to the -CH 3 asymmetric and symmetric vibrational stretching was located at 2989 cm −1 , while the -CH 2 asymmetric vibrational stretching band was detected at 2902 cm −1 [31,32].…”

Section: Ftir Spectroscopy Analysesmentioning

confidence: 99%

More about Persulfate-Assisted Ferrilanthanide-Mediated Photocatalysis of Textile Industry Dye Reactive Black 5: Surface Properties and Structural Assessment

Arslan-Alaton¹,

Koba-Ucun²,

Türkten

et al. 2023

Water

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Color and organic matter removal from dyehouse effluent remains a challenging issue for the environmentalist and textile dyer. Until now, various treatment processes have been proposed with limited success. In this study, the textile dye and model industrial pollutant Reactive Black 5 (RB5; 20 mg/L) could be rapidly degraded by persulfate (PS)-enhanced photocatalytic treatment using a novel, home-made lanthanum iron oxide (LF; 0.5 g/L). LF-mediated heterogeneous photocatalysis was effective when the solution pH was kept below 4. The photocatalytic degradation of RB5 solution was enhanced in the presence of 0.6 and 1.2 mM PS. The dissolved organic carbon (DOC) content of the aqueous, hydrolyzed RB5 solution (initial DOC = 5.15 mg/L) was effectively reduced by LF/UV-A (LF = 0.5 g/L; 52–54% DOC removal after 150–180 min) and LF/PS/UV-A (LF = 0.5 g/L; 60–66% DOC removal after 120 min) treatments. LF photocatalyst could be reused in four consecutive cycles for complete color and partial DOC removals without significant deterioration of the treatment performance with the LF/PS/UV-A/pH 3 process. Instrumental analyses of LF’s surface morphology/chemical composition and structural features via EDAX/SEM/Raman/FTIR/UV-vis/fluorescence spectroscopy indicated that LF remained practically intact throughout photocatalytic treatment, though slight changes/decreases in particle size/partial surface deformation and agglomeration coverage were observed, particularly during LF/PS/UV-A treatment. The presence of RB5 and its degradation products on the LF surface revealed that surface adsorption played a major role in LF-mediated photocatalysis. The Fe-content did not deviate appreciably from its original value after photocatalytic treatment.

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Highly efficient treatment of real benzene dye intermediate wastewater by simple limestone and lime neutralization-coagulation with improved Fenton oxidation

Guo

Xue

Zhang

et al. 2018

Environ Sci Pollut Res

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Multistage Fenton oxidation is a favored method for the treatment of benzene dye intermediate (BDI) wastewater, but the pH adjustments required after each stage of the Fenton process with a simple way is still a challenge. Limestone pretreatment and lime neutralization-coagulation were used to solve the problem in multistage Fenton process. First, we determined the optimal conditions of Fenton oxidation using the Box-Behnken response surface method. Limestone pretreatment before the multistage Fenton process allowed for simultaneous pH adjustment and 14.15% COD removal. Most notably, the lime cream neutralization-coagulation process effectively adjusted the pH after each stage of the Fenton process. The optimum CaO particle size, lime mass fraction, mixing time, and stirring speed were determined by orthogonal tests. COD removal (89.23%) was obtained when lime cream neutralization-coagulation was applied to the three-staged Fenton process, while only 58.57% COD removal was obtained by the unadjusted single-staged Fenton process. The COD and wastewater color were reduced from 10,600 mg/L and 12,200 multiples to 495 mg/L and 20 multiples, respectively, using the adjusted process. This improved method provides a promising cost-effective way to efficiently treat real BDI wastewater.

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Intermolecular mechanistic treatment of recalcitrant environmental pollutants: Azo, benzene, naphthalene and vinyl sulfone

Cited by 5 publications

References 36 publications

Study on the degradation mechanism and pathway of benzene dye intermediate 4-methoxy-2-nitroaniline via multiple methods in Fenton oxidation process

Study on the degradation mechanism and pathway of benzene dye intermediate 4-methoxy-2-nitroaniline via multiple methods in Fenton oxidation process

More about Persulfate-Assisted Ferrilanthanide-Mediated Photocatalysis of Textile Industry Dye Reactive Black 5: Surface Properties and Structural Assessment

Highly efficient treatment of real benzene dye intermediate wastewater by simple limestone and lime neutralization-coagulation with improved Fenton oxidation

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