Coagulation–flocculation–decantation of dye house effluents: concentrated effluents

Allègre, C.; Maisseu, M.; Charbit, F.; Moulin, P.

doi:10.1016/j.jhazmat.2004.07.005

Cited by 122 publications

(56 citation statements)

References 38 publications

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“…Many studies have confirmed that traditional coagulants and inorganic polymeric coagulants have much different coagulation behaviors and mechanisms [18][19][20][21]26]. Charge neutralization is considered to be a prerequisite condition for most coagulation processes to occur.…”

Section: Further Discussionmentioning

confidence: 99%

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Removal of direct dyes by coagulation: The performance of preformed polymeric aluminum species

Shi

Wang

et al. 2007

Journal of Hazardous Materials

502

172

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Removal of three direct dyes (Direct Black 19, Direct Red 28, and Direct Blue 86) by coagulation with three different Al based coagulants was investigated. The main purpose of this paper is to examine the coagulation features of polymeric aluminum coagulants in treatment of dye-polluted waters and the emphasis was placed on the roles of preformed Al species, particularly Al 13 . The performance of Al 13 in coagulation of dyes was observed through jar tests by comparing traditional Al salt, polyaluminum chloride (PACl), and purified Al 13 . The results showed that under most cases Al 13 had significantly higher efficiency in removal of direct dyes than traditional Al salt and commercial PACl with the exception of Direct Red 28 removal under high pH range. The coagulation of direct dyes could be greatly affected by pH. Reducing pH was favorable for preformed Al species in a broad pH range. For traditional Al coagulant, efficient dye removal only occurred in a relatively narrow pH range of near 6.0. The outstanding coagulation behavior of Al 13 could be ascribed to its high charge neutralization ability, relative stability and potential self-assembly tendency.

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Section: Further Discussionmentioning

confidence: 99%

“…The removal of reactive and disperse dyes by regular coagulation and electro-coagulation has been studied by some researchers [9,[18][19][20][21][22]. The coagulants used in most of the studies are traditional aluminum, ferric-based salts or synthesized organic coagulants.…”

Section: Introductionmentioning

confidence: 99%

Removal of direct dyes by coagulation: The performance of preformed polymeric aluminum species

Shi

Wang

et al. 2007

Journal of Hazardous Materials

502

172

View full text Add to dashboard Cite

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“…Although many conventional methods have been applied in removing organic contaminants, those methods do not lead to total mineralisation of the pollutants. Moreover, further treatment is needed since the methods employed are unable to convert the pollutants into harmless products such as CO 2 and H 2 O, which indirectly increases the operational cost (Allegre, Maisseu, Charbit, & Moulin, 2004;Gaya & Abdullah, 2008;Lu, Zhang, Ma, & Chen, 2009;Padmanabhan et al, 2006;Yang & Cheng, 2007). Therefore, the development of an efficient wastewater treatment solution is imperative.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of Chlorophenoxyacetic Acids by ZnO/r-Fe2O3 Nanocatalysts: A Comparative Study

Abdullah¹,

Mun²,

Zainal³

et al. 2013

IJC

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ZnO/γ-Fe 2 O 3 nanocomposite was synthesized via simple precipitation. The synthesized nanocatalysts underwent heat treatment at 450 o C for an hour. The characteristics of the nanocomposite were investigated by XRD, TEM, and BET surface area measurement. Zeta potential analysis was used to examine the surface charge properties of the nanocatalysts. The synthesized nanocomposite has an average particle size of 11 nm and a surface area of 20 m 2 g -1 . The potential of ZnO/γ-Fe 2 O 3 as a photocatalyst was evaluated by photodegrading chlorophenoxyacetic acids (PAA, 2,4-D, 2,4,5-T and 4CA). The decomposition of chlorophenoxyacetic acids by ZnO/γ-Fe 2 O 3 followed 4CA > 2,4,5-T ≈ 2,4-D > PAA. The result indicates the applicability of ZnO/γ-Fe 2 O 3 nanocomposite as a photocatalyst in removing organic pollutants in wastewater.

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“…While TiO 2 is widely employed as a Photo catalyst, ZnO is a suitable alternative toTiO 2 as it has a similar band gap energy (3.2eV) [4], larger quantum efficiency than TiO 2 and higher photocatalytic efficiencies have been reported Poulios and Tsachpinis [5,6,7,8]. Semiconductors (such as TiO 2 , ZnO, Fe 2 O 3 , CdS, and ZnS) can act as sensitizers for light-induced redox-processes due to the electronic structure of the metal atoms in chemical combination, which is characterized by a filled valence band, and an empty conduction band [9]. The quantum efficiency of ZnO powder is also significantly larger than that of TiO 2 powder, and higher catalytic efficiencies have been reported for ZnO [10].…”

Section: Introductionmentioning

confidence: 78%

ZnO<sub></sub>/VNC Material for UV-Photodegradation of Methylene Blue

Arunkumar

Chandrasekaran

Ahamed

2016

ILCPA

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ABSTRACT. ZnO materials act as a Photocatalytic reaction and it leads to partial or complete mineralization or decolorization of organic pollutants. Upon irradiation with UV/visible light, semiconductors catalyze undergoes redox reactions in presence of air/O 2 and water. In the present study Zinc oxide (ZnO) was doped with activated carbon prepared from the stem of the plant material by chemical activation namely, Vitex negundo stem carbon (VNC). The decolourisation and degradation study of a dye namely, methylene blue (MB) was carried out to find out the efficiency of catalytic property of ZnO/VNC. The reaction was performed at 20, 40, 60 ppm solute ZnO/VNC ion at 10 min interval of time. It found that the prepared ZnO / VNC composite exhibits an enhanced Photocatalytic activity for MB degradation under visible light irradiation and its photo catalysis efficiency was analyzed in specific 663 nm λ max using a UV-vis-spectrophotometer. The surface morphology and functional group present in the ZnO/VNC material was characterized by using FT-IR, SEM and XRD. The result reveals that the ZnO/VNC structure consists of irregular aggregates with rough surfaces and high photodegradation activities of ZnO/VNC on MB solutions are found to be at 20ppm. The ZnO/VNC may be used as an alternative adsorbent to remove MB from aqueous solutions.

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Coagulation–flocculation–decantation of dye house effluents: concentrated effluents

Cited by 122 publications

References 38 publications

Removal of direct dyes by coagulation: The performance of preformed polymeric aluminum species

Removal of direct dyes by coagulation: The performance of preformed polymeric aluminum species

Photodegradation of Chlorophenoxyacetic Acids by ZnO/r-Fe2O3 Nanocatalysts: A Comparative Study

ZnO<sub></sub>/VNC Material for UV-Photodegradation of Methylene Blue

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