Photocatalytic degradation of methyl green dye in aqueous solution over natural clay-supported ZnO–TiO 2  catalysts

Hadjltaief, Haithem Bel; Zina, Mourad Ben; Gálvez, María Elena; Costa, Patrick Da

doi:10.1016/j.jphotochem.2015.09.008

Cited by 192 publications

(74 citation statements)

References 47 publications

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“…A detailed description of photocatalytic 143 reactor was reported in an earlier study (Bel Hadjltaief et al 2013;Bel Hadjltaief et al 2016). 144 Irradiation was carried out using an UV-lamp (Black-Ray B 100WUV-lamp, V-100AP series) 145 with a wavelength of 365 nm.…”

Section: Photocatalytic Activity and Irradiation Experiments 141mentioning

confidence: 99%

“…At higher pH than 223 pHpzc, catalyst surface is negatively charged and attracts cations. Conversely below pHpzc, 224 catalyst surface is positively charged and repels cations (Bel Hadjltaief et al 2016). Therefore, 225 this parameter determines the ability of catalysts to adsorb either anionic or cationic dyes.…”

Section: Photocatalytic Activity and Irradiation Experiments 141mentioning

confidence: 99%

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Photocatalytic decolorization of cationic and anionic dyes over ZnO nanoparticle immobilized on natural Tunisian clay

Hadjltaief

Ameur

Costa

et al. 2018

Applied Clay Science

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122

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. Photocatalytic decolorization of cationic and anionic dyes over ZnO nanoparticle immobilized on natural Tunisian clay. Applied Clay Science, Elsevier, 2018Elsevier, , 152, pp.148 -157. 10.1016Elsevier, /j.clay.2017 In the present work we describe a simple and low-cost method for the decolorization of textile 23 dyeing and printing wastewaters, using ZnO as photocatalyst supported on natural Tunisian clay 24 (ZnO/Clay). This composite ZnO/Clay material was synthesized through a sol-gel method. X-25 ray diffraction (

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Section: Photocatalytic Activity and Irradiation Experiments 141mentioning

confidence: 99%

Section: Photocatalytic Activity and Irradiation Experiments 141mentioning

confidence: 99%

Photocatalytic decolorization of cationic and anionic dyes over ZnO nanoparticle immobilized on natural Tunisian clay

Hadjltaief

Ameur

Costa

et al. 2018

Applied Clay Science

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122

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“…In the XRD patterns, peaks observed for the ZnO curve represents hexagonal wurtzite ZnO (Zhang et al 2012;Bechambi et al 2015a, b). The XRD curve for TiO 2 has peaks characteristic of anatase crystalline phase (Bel Hadjltaief et al 2016). Liao et al (2008) observed a similar curve for TiO 2 with a dominant peak corresponding to 2h = 25.3°in the pattern and attributed it to a dominant anatase phase.…”

Section: Findings Catalyst Characterizationmentioning

confidence: 81%

Investigating the synergy of integrated anaerobic digestion and photodegradation using hybrid photocatalyst for molasses wastewater treatment

Mabuza

Otieno

Apollo

et al. 2017

Euro-Mediterr J Environ Integr

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Anaerobic digestion (AD) can remove the high organic load of molasses wastewater (MWW), but is ineffective in removing the characteristic dark brown colour caused by biorecalcitrant melanoidin. Ultraviolet (UV) photodegradation, can mineralise the biorecalcitrants leading to complete colour removal, but with a high-energy input and low organic load removal. This study investigated the plausibility of integrating the two processes for organic load and colour reductions. Desk scale AD and photodegradation processes were carried out in batch reactors. A hybrid photocatalyst consisting of titanium dioxide (TiO 2 ) and zinc oxide (ZnO) was used for photocatalytic degradation. Biodegradation at thermophilic conditions in the bioreactor achieved high total organic carbon (TOC) and chemical oxygen demand (COD) reductions of 80 and 90%, respectively, but with an increased colour intensity. Contrastingly, UV photodegradation achieved a high colour reduction of 92% with an insignificant 6% TOC reduction, after 30 min of irradiation. During photodegradation, the mineralisation of the biorecalcitrant organic compounds led to the colour disappearance. The energy required for the TOC reduction was 40-fold higher than that required for the colour reduction in the same irradiation period, suggesting that the UV process was only suitable for colour reduction. Therefore, there is a possible synergy when the two processes are integrated, with AD preceding UV, where AD removes the high COD/TOC while UV removes the recalcitrant colour at a reduced cost.

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“…At a pH lower than pzc the surface of photocatalyst is positively charged, whereas at pH higher than pzc it becomes negatively charged. Since RhB is a cationic dye, the pH higher than that of the pzc favors the adsorption of RhB dye molecule on the catalyst surface which results in increases the removal of RhB dye under neutral and basic conditions (Hadjltaief et al 2016). Moreover, pH of the solution affects the formation of hydroxyl radicals by the reaction between hydroxide ions and photoinduced holes on the surface of the photocatalysts.…”

Section: Effect Of Phmentioning

confidence: 99%

Enhanced photocatalytic performance of (ZnO/CeO2)-β-CD system for the effective decolorization of Rhodamine B under UV light irradiation

Velusamy¹,

Lakshmi²

2017

Appl Water Sci

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In this work, we attempt a new approach for the study on photocatalytic ability of (ZnO/CeO 2 ) improved by b-CD under UV light irradiation for the photodecolorization of RhB. The (ZnO/CeO 2 ) composite was prepared by mixing ZnO with CeO 2 in a weight ratio of 4:1. The surface interaction of (ZnO/CeO 2 ) with b-CD was determined by characterizing their structural, morphological and optical properties. The formation of an inclusion complex between RhB dye and b-CD was confirmed by UV-visible spectral analyses. The photocatalytic activity of (ZnO/CeO 2 )-b-CD system was evaluated by the decolorization of RhB dye in aqueous solution under UV light irradiation. The effects of operational parameters like the ratio of (ZnO/CeO 2 ), initial concentration of dye, catalyst dose, irradiation time and pH have been analyzed. The photocatalytic decolorization of RhB follows pseudo-first order kinetics. The mineralization of RhB has been confirmed by COD measurements. A possible mechanism for the photocatalytic decolorization of RhB by (ZnO/CeO 2 )-b-CD system under UV light irradiation was also discussed.

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Photocatalytic degradation of methyl green dye in aqueous solution over natural clay-supported ZnO–TiO 2 catalysts

Cited by 192 publications

References 47 publications

Photocatalytic decolorization of cationic and anionic dyes over ZnO nanoparticle immobilized on natural Tunisian clay

Photocatalytic decolorization of cationic and anionic dyes over ZnO nanoparticle immobilized on natural Tunisian clay

Investigating the synergy of integrated anaerobic digestion and photodegradation using hybrid photocatalyst for molasses wastewater treatment

Enhanced photocatalytic performance of (ZnO/CeO2)-β-CD system for the effective decolorization of Rhodamine B under UV light irradiation

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