Mesoporous carbons as adsorbents to removal of methyl orange (anionic dye) and methylene blue (cationic dye) from aqueous solutions

TiO2 P25 was fluorinated by thermal shock method in order to study the influence of thermal shock fluorination on the surface properties and the photocatalytic activity for the degradation of cationic and anionic organic dyes at different pH values. The surface charge of catalysts was characterized by the pHPZC measurement. The photocatalytic activity of catalysts was evaluated via the degradation of methylene blue (cationic dye) and methyl orange (anionic dye). The results showed that the thermal shock fluorination and the rise of solution pH can increase the surface negative charge of TiO2, which enhanced the adsorption of methylene blue and then improved the photocatalytic degradation of this cationic dye under UV and visible light. On the other hand, after the fluorination, the adsorption of methyl orange on TiO2 was strongly reduced, which limited the photocatalytic oxidation of this anion dye.

Download Full-text

Fabrication of MoO3 Nanowire-based Membrane Devices for the Selective Adsorption of Cationic Dyes from Aqueous Solutions with High Performance and Reusability

Micromachines ◽

10.3390/mi10090586 ◽

2019 ◽

Vol 10 (9) ◽

pp. 586 ◽

Cited By ~ 1

Author(s):

Zhang ◽

Park

Keyword(s):

Methylene Blue ◽

Methyl Orange ◽

Aqueous Solutions ◽

Rhodamine B ◽

High Performance ◽

Selective Adsorption ◽

Treatment Method ◽

Cationic Dyes ◽

Adsorption Ability ◽

Anionic Dye

A series of ultralong (up to tens of micrometers) MoO3 nanowire-based membranes were synthesized for the treatment of aqueous solutions containing the cationic dyes methylene blue (MB) and rhodamine B (RhB). This treatment method possesses extremely rapid and superhigh adsorbability (up to 521 and 321 mg/g for MB and RhB, respectively), as well excellent selective adsorption ability of cationic dyes with respect to the anionic dye methyl orange (MO). Moreover, the cationic dyes on the membrane can be desorbed easily, and reusability is good.

Download Full-text

Linear polymeric ionic liquids as phase-transporters for both cationic and anionic dyes with synergic effects

Polymer Chemistry ◽

10.1039/c5py01123j ◽

2015 ◽

Vol 6 (39) ◽

pp. 7060-7068 ◽

Cited By ~ 7

Author(s):

Hualei Zhao ◽

Yanting Yu ◽

Zonghao Li ◽

Bin Luo ◽

Xinhang Wang ◽

...

Keyword(s):

Methylene Blue ◽

Ionic Liquids ◽

Methyl Orange ◽

Cationic Dye ◽

Anionic Dyes ◽

Polymeric Ionic Liquids ◽

Anionic Dye

Linear polymeric ionic liquids were synthesized and demonstrated to be very effective transporters for both anionic dye methyl orange (MO) and cationic dye methylene blue (MB) from water to chloroform individually as well as simultaneously.

Download Full-text

Degradation of cationic and anionic dyes in coagulation–flocculation process using bi-functionalized silica hybrid with aluminum-ferric as auxiliary agent

RSC Advances ◽

10.1039/c5ra01346a ◽

2015 ◽

Vol 5 (43) ◽

pp. 34206-34215 ◽

Cited By ~ 59

Author(s):

Yen-Yie Lau ◽

Yee-Shian Wong ◽

Tjoon-Tow Teng ◽

Norhashimah Morad ◽

Mohd Rafatullah ◽

...

Keyword(s):

Methylene Blue ◽

Methyl Orange ◽

Cationic Dye ◽

Functionalized Silica ◽

Anionic Dyes ◽

Methyl Orange Degradation ◽

Anionic Dye ◽

Coagulation Process ◽

Flocculation Process ◽

Silica Hybrid

Cationic dye (methylene blue) and anionic dye (methyl orange) degradation in the coagulation process was demonstrated.

Download Full-text

N-TiO2-x Nanocatalysts: PLAL Synthesis and Photocatalytic Activity

Journal of Nanomaterials ◽

10.1155/2020/2901516 ◽

2020 ◽

Vol 2020 ◽

pp. 1-10

Author(s):

Enza Fazio ◽

Angela Maria Mezzasalma ◽

Luisa D’Urso ◽

Salvatore Spadaro ◽

Francesco Barreca ◽

...

Keyword(s):

Methylene Blue ◽

Methyl Orange ◽

Azo Dye ◽

Preparation Method ◽

Pulsed Laser ◽

Pulsed Laser Ablation ◽

Fine Tuning ◽

Cationic Dye ◽

Laser Ablation In Liquid ◽

Methylene Blue Cationic Dye

N-TiO2-x nanocatalysts are developed by the pulsed laser ablation in liquid (PLAL) technique, a simple and surfactant-free preparation method. The PLAL approach allows synthesizing chemical-morphological fine-tuning water TiO2-based nanomaterials, starting from targets of different nature (powders and commercial high purity targets). The catalytic activity was investigated using methylene blue (cationic dye) and methyl orange (azo dye). A different photocatalytic response was found for the various kinds of N-TiO2-x. In the first 20 min, under UV and visible light, about 50% and 10% of the methyl orange were removed using the N-TiO2-x and TiO2 colloids, respectively. In addition, we observe that the response towards the methylene blue is comparable in all the synthesized samples under UV irradiation while differing by about 30% under a visible lamp. The enhanced photocatalytic response of the N-TiO2-x nanocatalysts with respect to the TiO2 one is dependent on the content of the nitrogen dopant, surface area, and nitrogen-oxygen bonding configurations.

Download Full-text