REMOVAL OF THE HEAVY METAL COMPLEX DYE ISOLAN DARK BLUE 2SGL-01 ON (CO3)0.26/Cl0.48-Mg2.67Zn0.54Al..

If textile dyeing effluents are directly disposed of without sufficient treatment, residual dyes constitute a threat to the environment. Heavy metal complex dyes, such as Isolan Dark Blue 2SGL-01 (IDB), are very difficult to bioremediate and must be removed before being disposed of in a body of water. For anionic dangers, layered double hydroxides (LDHs) are frequently used adsorbents. The adsorption of IDB on the (CO3)0.26/Cl0.48-Mg2.67Zn0.54Al layered double hydroxide (LDH20) from aqueous solutions was investigated. Initial pH, equilibration period, adsorbent dose, and IDB concentration were all investigated as adsorption parameters. The optimal pH for adsorption was pH=4.6, with a shaking period of 6 hours and an adsorbent concentration of 0.2 percent w/v, resulting in a 99.3 percent removal efficiency for 100 mg L-1 of IDB. For the adsorption process, a pseudo-second order rate kinetics model was proposed, revealing a chemisorption mechanism. A Langmuir-type adsorption isotherm model with a high monolayer capacity of 94.5 mg g-1 was also proposed, which is higher than that reported for several LDH adsorbents for sulfonated dyes.

The adsorbed IDB was recovered from LDH20 in a single-batch process with a 53.6 percent elution efficiency using one mol L-1 Na2CO3 at 50oC, indicating that it will not be a secondary sludge waste when used for IDB removal.

Please see the link :- https://www.ikprress.org/index.php/JACSI/article/view/3405