Photooxidative degradation of Acid Red 27 in a tubular continuous-flow photoreactor: influence of operational parameters and mineralization products

Daneshvar, N.; Rabbani, M.; Modirshahla, Nasser; Behnajady, Mohammad A.

doi:10.1016/j.jhazmat.2004.10.007

Cited by 84 publications

(48 citation statements)

References 22 publications

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“…7 indicate that with increasing the lamp distance from the rotating disc, PNP removal efficiency decreases. In fact, with increasing the distance from the surface of the disc, the light intensity of UV lamp decreases, which leads to less production of hydroxyl radicals and lower removal percentage of PNP 28 .…”

Section: Effect Of the Distance Of Lamps From The Surface Of The Spinmentioning

confidence: 99%

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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Section: Effect Of the Distance Of Lamps From The Surface Of The Spinmentioning

confidence: 99%

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 range, the apparent pseudo-first rate constant increases from 0.083 min -1 to 0.120 min . When the initial peroxide concentration is very high, generated •OH are mostly reacting with the excess of peroxide and produce HO 2 • radicals, according to Reaction (11) (Aleboyeh et al, 2005;Daneshvar et al, 2005). It is clear that HO 2 • radicals are less reactive than •OH radicals and the decolourisation rate decreases (Daneshvar et al, 2005).…”

Section: Effect Of Initial H 2 O 2 Concentrationmentioning

confidence: 99%

“…Colonna et al (1999) reported that homogenous advanced oxidation processes employing hydrogen peroxide with UV light lead to complete decolourisation and mineralisation of sulphonated azo and anthraquinone dyes. This process is based on the generation of hydroxyl radicals (•OH), and a strong oxidising agent (E 0 = 2.8 V), which degrade a broad range of organic pollutants quickly and non-selectively (Muruganandham et al, 2004;Aleboyeh et al, 2005;Daneshvar et al, 2005). Reaction of hydroxyl radicals generated in the presence of an organic substrate may occur via one of three general pathways: (i) hydrogen abstraction; (ii) electrophilic addition and (iii) electron transfer (Daneshvar et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…This process is based on the generation of hydroxyl radicals (•OH), and a strong oxidising agent (E 0 = 2.8 V), which degrade a broad range of organic pollutants quickly and non-selectively (Muruganandham et al, 2004;Aleboyeh et al, 2005;Daneshvar et al, 2005). Reaction of hydroxyl radicals generated in the presence of an organic substrate may occur via one of three general pathways: (i) hydrogen abstraction; (ii) electrophilic addition and (iii) electron transfer (Daneshvar et al, 2005). The method is inexpensive and non-toxic for treatment of water (Bilgi et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…hydroxyl radical is a non-selective and very powerful oxidising agent and can initiate the decolourisation reactions by reacting with the dye molecules (Zollinger, 2003;Muruganandham et al, 2004;He et al, 2008;Aleboyeh et al, 2005;Daneshvar et al, 2005;Aleboyeh et al, 2003;Daneshvar et al, 2003).…”

mentioning

confidence: 99%

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Effects of system parameters and inorganic salts on the photodecolourisation of textile dye Reactive Blue 19 by UV/H<sub>2</sub>O<sub>2</sub> process

Radovic¹,

Mitrovic²,

Bojc

et al. 2014

WSA

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The photodecolourisation of textile dye Reactive Blue 19 (RB 19), an anionic anthraquinone dye of the reactive class, was investigated using UV radiation in the presence of H 2 O 2 in a batch photo-reactor with low-pressure mercury lamps. The effects of the system parameters: initial pH, initial dye concentration, concentration of peroxide and radiation intensity, as well as the presence of salts, (NaCl, Na 2 SO 4 , NaNO 3 , NaH 2 PO 4 ) on dye decolourisation was examined. Increasing the initial pH resulted in an increase in decolourisation efficiency. Results showed that with an increase of dye concentration from 10 to 100 mg•ℓ This study has shown that the UV/H 2 O 2 process is a promising technology for degradation of RB 19 in water and wastewater.

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Specific Methods for the Destruction of Hazardous Chemicals in the Laboratory

Lunn¹,

Sansone²

2012

Destruction of Hazardous Chemicals in the Laboratory

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Photooxidative degradation of Acid Red 27 in a tubular continuous-flow photoreactor: influence of operational parameters and mineralization products

Cited by 84 publications

References 22 publications

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

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

Effects of system parameters and inorganic salts on the photodecolourisation of textile dye Reactive Blue 19 by UV/H<sub>2</sub>O<sub>2</sub> process

Specific Methods for the Destruction of Hazardous Chemicals in the Laboratory

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