Abstract
In this work, TiO2 nanopowder (TIP600) was prepared by a sol–gel method and titanium isopropoxide, glacial acetic acid, and deionized water were used as the starting materials. Adsorption of congo red (CR) on Degussa-P25 (P25), commercial TiO2 (C-TiO2), and TIP600 was investigated. But, photochemical and photocatalytic event were not used for this adsorption process. Adsorption of CR onto the adsorbents was studied at different temperatures (25.0, 40.0, and 50.0°C) and various adsorbent doses (0.1, 0.05, and 0.025 g). The kinetics of dye adsorption has been investigated in terms of pseudo-first order, pseudo-second order, and intra-particle diffusion rate. The results indicate that pseudo-second order plays a significant role in the adsorption mechanism. The adsorptive capacity of TIP600 is much higher than that of other adsorbents. The value of ∆H# was obtained as positive, therefore the nature of adsorption was found endothermic. Equilibrium isotherm of CR was fitted to the Freundlich and Langmuir models. The equilibrium data of adsorbate were found to best fit the Langmuir model. For CR, TIP-600 was demonstrated as the best adsorption capacity (qmax 112 mg g−1).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
