Fabrication of carbon nanotube (CNTs)/Co3O4-Ni3O4/Al2O3 nanocomposite catalyst and its application for photocatalytic removal of Celestine blue dye

Currently, the study of semiconductor materials is very promising for the photocatalytic remediation of hazardous organic substances present in the air and water. Various semiconductors have been investigated in this interesting photo-assisted methodology, among them metal oxides such as ZnO, TiO2 and their derivatives. In this study, ZnTiO3/TiO2 was synthesized by the sol-gel method using Ti(OC3H7)4 and Zn(CH3COO)2 · 2H2O as reagents. The role of several conditions such as synthesis temperature and TiO2:ZnO proportion on the morphology and purity of compounds obtained was studied, and the suitable conditions for the synthesis of photocatalysts were determined. Various techniques were used to conduct a systematic investigation on the structural, morphological, and photocatalytic properties of ZnTiO3/TiO2. Scanning Electron Microscopy (SEM) images show that ZnTiO3/TiO2 have a typical particle size of approximately 100 nm with a quasi-spherical shape. The adsorption and photocatalytic activity were investigated by the decolorization of Methylene Blue (MB) as an organic contaminant under UV irradiation both in TiO2 and ZnTiO3/TiO2 supported over some Ecuadorian clays. The materials evaluated were prepared in the shape of 0.2 cm (diameter) and 1.0 cm (length) cylindrical extrudates. The degradation percentage of MB obtained was 85% approximately after 150 min of irradiation. The results obtained allow us to conclude that these synthesized materials can be used as adsorbents and photocatalysts.

Download Full-text

Integrated Membrane–Electrocoagulation System for Removal of Celestine Blue Dyes in Wastewater

Membranes ◽

10.3390/membranes10080184 ◽

2020 ◽

Vol 10 (8) ◽

pp. 184

Author(s):

Muhammad Syaamil Saad ◽

Lila Balasubramaniam ◽

Mohd Dzul Hakim Wirzal ◽

Nur Syakinah Abd Halim ◽

Muhammad Roil Bilad ◽

...

Keyword(s):

Textile Industry ◽

Membrane Filtration ◽

Dye Removal ◽

Textile Wastewater ◽

Membrane System ◽

Electrolytic Cell ◽

Integrated System ◽

Superior Performance ◽

Blue Dye ◽

Celestine Blue

The textile industry provides for the needs of people especially in apparel and household items. The industry also discharges dye-containing wastewater that is typically challenging to treat. Despite the application of the biological and chemical treatments for the treatment of textile wastewater, these methods have their own drawbacks such as non-environment friendly, high cost and energy intensive. This research investigates the efficiency of the celestine blue dye removal from simulated textile wastewater by electrocoagulation (EC) method using iron (Fe) electrodes through an electrolytic cell, integrated with nylon 6,6 nanofiber (NF) membrane filtration for the separation of the flocculants from aqueous water. Based on the results, the integrated system achieves a high dye removal efficiency of 79.4%, by using 1000 ppm of sodium chloride as the electrolyte and 2 V of voltage at a constant pH of 7 and 10 ppm celestine blue dye solution, compared to the standalone EC method in which only 43.2% removal was achieved. Atomic absorption spectroscopy analysis was used to identify the traces of iron in the residual EC solution confirming the absence of iron. The EC-integrated membrane system thus shows superior performance compared to the conventional method whereby an additional 10–30% of dye was removed at 1 V and 2 V using similar energy consumptions.

Download Full-text

Synthesis of Metal/Silica/Titania Composites for the Photocatalytic Removal of Methylene Blue Dye

Journal of Chemistry ◽

10.1155/2019/9010289 ◽

2019 ◽

Vol 2019 ◽

pp. 1-6 ◽

Cited By ~ 4

Author(s):

Sana Ahmad ◽

Arfa Saeed

Keyword(s):

Methylene Blue ◽

Organic Pollutant ◽

Sol Gel ◽

Blue Dye ◽

Methylene Blue Dye ◽

Reaction Conditions ◽

Structure Morphology ◽

Photocatalytic Removal ◽

Ft Ir ◽

Metal Doped

The present work deals with the synthesis of the metal-doped titanium dioxide/silica composite by using the sol-gel method. The structure, morphology, and composition of the prepared samples were characterized by using Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The prepared composites were used for the photodegradation of methylene blue dye in sunlight. Different parameters like pH, time, and catalytic concentration were varied to optimize the reaction conditions. Maximum 99.8% degradation was observed with the Ni-doped composite. The results indicate extraordinary efficiency of all metal-doped composites for the removal of the harmful organic pollutant like methylene blue.

Download Full-text

Adsorption behavior of methylene blue dye on nanocomposite multi-walled carbon nanotube functionalized thiol (MWCNT-SH) as new adsorbent

Journal of Molecular Liquids ◽

10.1016/j.molliq.2016.02.004 ◽

2016 ◽

Vol 216 ◽

pp. 830-835 ◽

Cited By ~ 52

Author(s):

D. Robati ◽

B. Mirza ◽

R. Ghazisaeidi ◽

M. Rajabi ◽

O. Moradi ◽

...

Keyword(s):

Methylene Blue ◽

Carbon Nanotube ◽

Adsorption Behavior ◽

Blue Dye ◽

Methylene Blue Dye ◽

Multi Walled Carbon Nanotube

Download Full-text

Photocatalytic removal of methylene blue dye by using of ZnS and CdS

Iraqi Journal of Physics (IJP) ◽

10.30723/ijp.v15i33.135 ◽

2019 ◽

Vol 15 (33) ◽

pp. 11-16

Author(s):

Ruqaya Fouad Kadhim

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Photocatalytic Degradation ◽

Uv Radiation ◽

Degradation Efficiency ◽

Blue Dye ◽

Time Interval ◽

Methylene Blue Dye ◽

Micro Particles ◽

Photocatalytic Removal

Photocatalytic degradation of methylene blue was studied using CdS and ZnS as catalyst. The photocatalytic activity of the specimen was studied by exposing to UV-radiation. The result shows that the degradation efficiency of the dye for CdS micro-particles was 92% after 7 hours and for ZnS micro-particles was 88.29% for the same time interval.

Download Full-text