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Removal of azo dye by synthesized TiO2nanoparticles

100%

Amin M. S. A., Uddin M. J., Islam M. A.

Nanomaterials and the Environment

2013

vol. 1

18-22

TiO2 nanoparticles were synthesized by one-step Sol-gel method. Prepared nanoparticles were characterized by different characterization (SEM, EDS and XRD) techniques. The aqueous solution of Methylene Blue (MB) has been subjected to evaluate the photocatalytic degradation by UV radiation in the presence of synthesized TiO2 photocatalyst coated reactor. The experiments were conducted with and without aeration, using different dye concentrations, and catalyst loading, revealed that the degradation was strongly influenced by respective experimental parameters. However, maximum MB dye was removed by the photodegradation process operating with aeration and higher catalyst dosing.

Instance-based regression with missing data applied to a photocatalytic oxidation process

100%

Leon F., Piuleac C., Curteanu S., Poulios I.

In this paper, a modified nearest-neighbor regression method (kNN) is proposed to model a process with incomplete information of the measurements. This technique is based on the variation of the coefficients used to weight the distances of the instances. The case study selected for testing this algorithm was the photocatalytic degradation of Reactive Red 184 (RR184), a dye belonging to the group of azo compounds, which is widely used in manufacturing paint paper, leather and fabrics. The process is conducted with TiO2 as catalyst (an inexpensive semiconductor material, completely inert chemically and biologically), in the presence of H2O2 (with the role of increasing the rate of photo-oxidation), at different pH values. The final concentration of RR184 is predicted accurately with the modified kNN regression method developed in this article. A comparison with other machine learning methods (sequential minimal optimization regression, decision table, reduced error pruning tree, M5 pruned model tree) proves the superiority and efficiency of the proposed algorithm, not only for its results, but for its simplicity and flexibility in manipulating incomplete experimental data. [...]

RETRACTED ARTICLE: Kinetic and anion degradation products study on photocatalytic degradation of reactive orange 5 solution with phosphotungstic acid

88%

Zhong J., Zhao H., Ma D., Lian A., Li M., Xie B., Li J.

Open Chemistry

2008

vol. 6

issue 1

99-105

Increasing environmental pollution caused by toxic dyes is a matter of great concern due to their hazardous nature. So it is crucial to develop processes which can destroy these dyes effectively. It has been generally agreed that reactive orange 5 (KGN) can be effectively degraded in aerated phosphotungstic acid (HPA) in a homogeneous reaction system using near-UV irradiation. In this paper, photocatalytic degradation of reactive orange 5 solutions with phosphotungstic acid was investigated, especially more attention was paid to the kinetic model and the anion degradation products. The results revealed that the photocatalytic degradation reaction of KGN with HPA in a homogenous solution can be described by Langmuir-Hinshelwood equation and Langmuir-Hinshewood kinetic model described it well. The reaction manifested the first order with lower concentration(⩽30 mg L−1) with the limiting rate constant and the adsorption constant in this case being 0.8098 mg L−1 min−1 and 4.359 10−2 L mg−1, respectively. The degradation mechanism of KGN with HPA is different from that with TiO2, the anion products of the two reaction systems are the same. The difference in degradation mechanism of KGN with HPA from that with TiO2 is caused by the nature of the photocatalyst. [...]

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2 Open Chemistry

1 Nanomaterials and the Environment

2 2012

1 2008

1 Amin M. S. A.

1 Curteanu S.

1 Islam M. A.

1 Leon F.

1 Li J.

1 Li M.

1 Lian A.

1 Ma D.

1 Piuleac C.

1 Poulios I.

1 Uddin M. J.

1 Xie B.

1 Zhao H.

1 Zhong J.

Search results

Removal of azo dye by synthesized TiO2nanoparticles

Instance-based regression with missing data applied to a photocatalytic oxidation process

RETRACTED ARTICLE: Kinetic and anion degradation products study on photocatalytic degradation of reactive orange 5 solution with phosphotungstic acid