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Cationic Dyes - DOAJ

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Last Updated: 02 October 2022

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A new type of calcium-rich biochars derived from spent mushroom substrates and their efficient adsorption properties for cationic dyes

Adsorption is widely used as the most effective treatment of dye wastewater treatment, and the widespread use of adsorption has emphasised the need to find low-cost but good adsorbents. The increase in pyrolysis temperature from 350 to 750 bb0C resulted in an increase in both biochar ash, Ca content, and a narrow surface area, which gave high-temperature biochars the ideal adsorbents for cationic dyes. LS750 was more effective to adsorb dyes than GS750, according to its higher Ca content and larger specific surface area. According to the Langmuir model, the LS750 had high adsorption capacities of 9,388. 04 and 3,871. 48 mg gu22121 for Malachite green and ST, respectively. pore filling, hydrogen bonding, electrostatic interaction, electrostatic exchange, and u03c0-u03c0-c0 stacking could be attributed to dye MG's adsorption process, while ST adsorption involved pore filling, electrostatic interaction, ion exchange, and stacking, while u03c0-u03c0 stacking.

Source link: https://doi.org/10.3389/fbioe.2022.1007630


Comparative removal of hazardous cationic dyes by MOF-5 and modified graphene oxide

Abstract — Malachite green is a cationic dye commonly used for dying purposes and as an inhibitor in aquaculture, food, health, and chemical industries due to its cytotoxic effects. MG removal was investigated in Herein, MOF-5 and aminated corn Stover's aminated graphene oxide of typical adsorbents of metal-frameworks and carbon-based classes for MG removal. ACS-RGO was superior for MG adsorption, and the kinetic rate coefficient for ACS-RGO was 7. 2 times higher than MOF-5. MG removal remained high in a wide range of pH, including ACS-RGO. However, dye removal was pH-dependent for MOF-5, from 32% to 67% by raising pH from 4 to 12. Increasing dye content from 25 mg/L to 100 mg/L decreased adsorption by MOF-5 and ACS-RGO for 30% and 7%, respectively. Dye removal was evident in a few tens of seconds after adding ACS-RGO to doses above 0. 5 g/L.

Source link: https://doi.org/10.1038/s41598-022-19550-5


The Decoloration of Anionic and Cationic Dyes Using ZnO and ZnO-Cu 2 O

ZnO and ZnO-Cu 2 O were grown on aluminum foam using the hydrothermal method. Both ZnO and ZnO-Cu 2 O exhibit higher absorption capacity toward anionic dyes thanks to the positively charged locations on the ground, but less adsorption capacity against cationic dyes. ZnO-Cu 2 O's adsorption ability is smaller than that of ZnO because there is a depletion layer at the interface.

Source link: https://doi.org/10.3390/cryst9050229


Adsorption of Cationic Dyes on a Magnetic 3D Spongin Scaffold with Nano-Sized Fe 3 O 4 Cores

For the first time, the assembly of a magnetic three-dimensional spongin scaffold with nano-sized Fe 3 O 4 cores is disclosed. The development of this magnetic sponginu2013Fe 3 O 4 composite was described by X-ray diffraction, thermogravimetric analysis, differential thermal analysis, vibrating sample magnetometer, Fourier-transform infrared spectroscopy, and zeta potential analyses. For two cationic dyes, the magnetic spongin/Fe 3 O 4 composite demonstrated excellent removal success. In our efforts to produce a renewable absorbent for organic wastewater treatment, we combined Fe 3 O 4 nanoparticles and spongin scaffold properties into a single composite, designated magnetic spongin scaffold. On a magnetic 3D spongin scaffold, the appropriative mechanism of adsorption of the cationic dyes is suggested. On the other hand, dyes are also used as models to demonstrate nanostructures' adsorption properties.

Source link: https://doi.org/10.3390/md19090512


Removal of Anionic and Cationic Dyes from Wastewater Using Activated Carbon from Palm Tree Fiber Waste

This paper explores the use of a simple technique for activated carbon from palm tree fiber waste in the green process. The removal of an anionic dye and a cationic dye from wastewater was investigated by a synthesized cost-effective AC. Chemical activation of each precursor is a fast way to activate each precursor and yields a high yield, according to the study. The maximum adsorption capacity was 9. 79 and 26. 58 mg g u22121 at 30 min for CR dye and RhB dye, respectively. With a high percentage removal of CR and RhB dyes, the optimum adsorbent dosage for the activated carbon from palm tree fiber was 0. 15 g. Both physical and chemical tests were found to be both efficient and cost-effective for determining dye adsorption with the Langmuir model and pseudo-second-order reaction, respectively.

Source link: https://doi.org/10.3390/pr9030416

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions