Decolorization of Remazol Black B in Aqueous Suspension of TiO2 (Published)
Commercially available titanium dioxides from two different companies, one from Fluka, Switzerland (designated as n-TiO2) and another from Merck, Germany (designated as p-TiO2) were used for the removal of Remazol Black B (RBB) from aqueous solution. The experimental results reveal that p-TiO2 acts as an adsorbent as well as a photocatalyst owing to porous surface morphology, whereas n-TiO2 does not demonstrate adsorption characteristics due to its non-porous and granular surface morphology. Adsorption of RBB on p-TiO2 was found to occur rapidly and more than 40% dye was adsorbed within 5 minutes. Under irradiation of sunlight and UV-light, the photocatalytic activities of the p-TiO2 and n-TiO2 were also examined, and the results manifest the higher degradation efficiency of the p-TiO2 than n-TiO2. Different experimental parameters such as catalyst loading, pH, and concentration of solution have been varied to search optimum conditions. Photodegradation efficiency was also found higher under sunlight irradiation than UV-light.
Keywords: Adsorption, Kinetics, Langmuir-Hinshelwood, Photodegradation, Remazol Black
REMOVAL OF SYNTHETIC DYE ACID RED 186 FROM WATER BY ACTIVATED CARBON (Published)
The adsorption of acid red 186(AR) onto activated carbon prepared from Libyan farms was studied, the effect of solution pH, contact time, adsorption dose and initial dye concentration was evaluated. The adsorption studied included Langmuir and Freundlish isotherms were applied to experimental results. The experimental results fitted very well to both adsorption isotherms. The mixture mono layer capacity obtained from Langmuir is q_e =7.62mg/g for activated carbon (100-45um) and q_e=7.194mg/g for activated carbon (lees than 45um).Therefore, activated carbon has the potential to be used as a low cost eco-friendly adsorbent for removal “activated carbon” dye from aqueous solution.
Keywords: Acidred186 dye, Activated carbon, Adsorption, Isotherms