Solar light induced and TiO2 assisted degradation of textile dye reactive blue 4

Neppolian, B.; Choi, Heechul; Sakthivel, S.; Arabindoo, Banumathi; Murugesan, V.

doi:10.1016/s0045-6535(01)00284-3

Cited by 522 publications

(265 citation statements)

References 21 publications

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“…As advanced oxidative processes (AOP) have gained importance recently, the chemical oxidation of dyes has been carried out by several techniques such as with hydrogen peroxide, 6 ozone, 7 some metal oxides such as those of titanium and zinc, 8 Fenton reactions, 9 and also by the association of some techniques to ultraviolet, 10,11 visible 12 and even sun light irradiation. 13,14 Heterogeneous photocatalysis in the presence of TiO 2 presents several advantages, as it is inexpensive, thermally and photochemically stable, atoxic to microorganisms, and works in the whole pH range. However, chemically degraded wastes may be toxic due to the presence of products generated during the photodegradation.…”

Section: Introductionmentioning

confidence: 99%

Evolutive follow-up of the photocatalytic degradation of real textile effluents in TiO2 and TiO2/H2O2 systems and their toxic effects on Lactuca sativa seedlings

Garcia¹,

Simionato²,

Almeida³

et al. 2009

J. Braz. Chem. Soc.

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). Em relação à toxicidade apresentada pelos produtos formados durante a degradação perante as sementes de alface (Lactuca sativa) os dados sugerem que não foi apresentada toxicidade considerável, uma vez que não houve redução significativa da porcentagem de germinação nem influência na porcentagem de crescimento das raízes e radículas, contudo, a associação TiO 2 /H 2 O 2 apresenta maior toxicidade nas primeiras horas de irradiação e posterior redução da mesma ao final de seis horas, enquanto que o TiO 2 somente aumenta um pouco sua toxicidade no final dos experimentos. Porém, comparados ao efluente bruto, ambos apresentaram redução de toxicidade, ou seja, os produtos fotogerados apresentam-se menos tóxicos que o efluente inicial.Textile industry wastes raise a great concern due to their strong coloration and toxicity. The objective of the present work was to characterize the degradation and mineralization of textile effluents by advanced oxidative processes using either TiO 2 or TiO 2 /H 2 O 2 association and to monitor the toxicity of the products formed during 6 h irradiation in relation to that of the in natura effluent. The results obtained demonstrated that the TiO 2 /H 2 O 2 association was more efficient in the mineralization of textile effluents than TiO 2 alone, with high mineralized ion concentrations (NH 4 + , NO 3 -, and SO 4 2-) and significant organic matter reduction rates (represented by the COD and TOC). The toxicity of the degradation products to lettuce seeds (Lactuca sativa) was not significant, since percent germination was not significantly affected and neither was root and sprout percent growth. However, while the TiO 2 /H 2 O 2 association was more toxic in the first hours of irradiation and less so in the end of the 6 h irradiation, the toxicity of TiO 2 increased only slightly in the end of the experiments. Comparatively, the photogenerated products of both the TiO 2 and the TiO 2 /H 2 O 2 association were less toxic than the in natura effluent.

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Section: Introductionmentioning

confidence: 99%

Evolutive follow-up of the photocatalytic degradation of real textile effluents in TiO2 and TiO2/H2O2 systems and their toxic effects on Lactuca sativa seedlings

Garcia¹,

Simionato²,

Almeida³

et al. 2009

J. Braz. Chem. Soc.

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“…Many catalysts such as TiO 2 (Degussa P25), TiO 2 (Merck), ZnO, ZrO 2 , WO 3 , SrO 2 , Fe 2 O 3 , CeO 2 , CdS and ZnS were used in photocatalytic degradation of vario us environmental contaminants [4]. The use of TiO 2 has been widespread in various fields, such as the use of TiO 2 in conjunction with natural zeolite clay for allowance phenol, modification of clay and TiO 2 usage with granular activated carbon has been studied for methyl orange dye waste elimination, and the use of activated carbon fibers to set aside RDX.…”

Section: Introductionmentioning

confidence: 99%

Color and COD degradation in photocatalytic process of procion red by using TiO2 catalyst under solar irradiation

Sari

Agustina

Melwita

et al. 2017

AIP Conference Proceedings

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Abstract. Increasing textile industries in Indonesia resulted in increasing the utilization of dyes. The use of synthetic dyes are still dominating because they have many advantages. But, synthetic dyes are difficult to decompose in nature so they can cause potential pollution if discharged directly into the environment. In this study, Procion Red was used as a model of synthetic dye wastewater. The objective of this research is to study the effect of TiO2 catalyst concentration and irradiation time on the degradation of Procion Red under solar irradiation. Photo degradation takes place by using TiO2 catalyst powder in the various concentration of Procion Red of 150-300 ppm. The various concentrations of TiO2 catalyst of 0.5-8 g/l were used. The color and COD degradation of Procion Red for 12 hours of solar irradiation were investigated. Color degradation was measured by using a spectrophotometer. While COD degradation was measured by using Ferrous Ammonium Sulfate (FAS) analysis method. The result showed when using Procion Red of 150 ppm, the highest color degradation of 100% was achieved by using TiO2 catalyst of 6 g/l and the highest COD degradation of 62% was obtained by using TiO2 catalyst of 8 g/l, under 12 hours of solar irradiation

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“…TiO 2 and especially anatase form, is considered as an excellent photocatalyst that can mineralize a large range of organic pollutants (Mills and Le Hunte 1997, Agrios and Pichat 2005, Lewandowski and Ollis 2004. This semi-conductor is the most studied material for such applications (Neppolian et al 2002). Alternatively, ZnO can be considered as the second photocatalyst after TiO 2 , whose physical-chemical properties are comparable to those of TiO 2 (Liqiang et al 2004, Behnajady et al 2006, Akyol and Bayramoylu 2005, Anandan et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Effect of calcium oxalate on the photocatalytic degradation of Orange II on ZnO surface

et al. 2012

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The photocatalytic degradation of aqueous solution of Orange II, has been investigated in the presence of ZnO catalyst with calcium oxalate as sacrificial agent. This study demonstrated that the performance of ZnO photocatalyst can be improved by addition of calcium oxalate. Results show that adsorption is an important parameter controlling the degradation phenomena. Indeed, the added oxalate causes a drop in the pH medium, what causes a better adsorption of Orange II on the ZnO surface. The effect of calcium oxalate is to increase the concentration of superoxides (O 2 Á-) and hydroperoxides (HO 2 Á) radicals, which are key intermediaries in the mechanism of photodegradation because of their powerful force of oxidation.

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Solar light induced and TiO2 assisted degradation of textile dye reactive blue 4

Cited by 522 publications

References 21 publications

Evolutive follow-up of the photocatalytic degradation of real textile effluents in TiO2 and TiO2/H2O2 systems and their toxic effects on Lactuca sativa seedlings

Evolutive follow-up of the photocatalytic degradation of real textile effluents in TiO2 and TiO2/H2O2 systems and their toxic effects on Lactuca sativa seedlings

Color and COD degradation in photocatalytic process of procion red by using TiO2 catalyst under solar irradiation

Effect of calcium oxalate on the photocatalytic degradation of Orange II on ZnO surface

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