Comparison of modified boehmite nanoplatelets and nanowires for dye removal from aqueous solution

Abstract

a b s t r a c tIn this study, boehmite (-AlOOH) nanoplatelets and nanowires were synthesized at a pH of 5 and 12, respectively, modified with sulfonic acid (-AlOOH-SA5), (-AlOOH-SA12), and were used to adsorb eriochrome black T (EbT) dye solutions. Transmission electron microscopy, scanning electron microscopy, Fourier-transform infrared spectroscopy and X-ray diffraction were used to characterize the prepared nanoplatelets and nano wires. The effect of many parameters including initial concentration, pH and contact time was investigated. Values of 212.76 and 116.28 mg g -1 were, respectively, obtained for AlOOH-SA5 and AlOOH-SA12 for the adsorption maximum of EbT. Compared between two structures, the results indicated that the optimum conditions for 100 mg L -1 EbT solution were pH of 3 and 0.5 g L -1 AlOOH-SA5 as well as pH of 3 and 1 g L -1 AlOOH-SA12. Results of adsorption isotherms and adsorption kinetics indicated which they better matched by the Langmuir isotherm and also the adsorption kinetics better described by the pseudo-second-order model. Thermodynamic parameters have been measured, and results indicate that the adsorption process was spontaneous and exothermic for AlOOH-SA12 and nonspontaneous and endothermic for AlOOH-SA5. Finally, AlOOH-SA5 is a suitable adsorbent than that of AlOOH-SA12 and can be used for dye removal in wastewater treatment processes.

Simultaneous removal of mixed pesticides and natural organic matter from surface waters by nitric and chlorosulfonic acid functionalized powdered activated carbon

“…This peak displays SO 3 H and S O groups, indicating the functionalization of the AC2S surface with sulfonic groups. Kamari et al 61 linked peaks between ≈1649 and 2900 cm −1 to the OH stretching absorption of S O groups and SO 3 H groups. As the 576.84 cm −1 peak disappeared, a new 508.04 cm −1 peak appeared in the AC2S adsorbent, indicating the presence of sulfonic acid groups, associated with C S stretching bands at ≈520 cm −1 .…”

“…This peak displays SO 3 H and SO groups, indicating the functionalization of the AC2S surface with sulfonic groups. Kamari et al 61 . linked peaks between ≈1649 and 2900 cm −1 to the OH stretching absorption of SO groups and SO 3 H groups.…”

Dual-Electronic Nanomaterial (Synthetic Clay) for Effective Removal of Toxic Cationic and Oxyanionic Metal Ions from Water

“…Meanwhile, the Freundlich model [31] (Equation ( 3)) is commonly used for the real design of water system because it is an empirical equation. Two adsorption isotherm models have been widely applied in the literature to model the experimental data of adsorption equilibrium because of the help of their parameters [3,5,7,32,33]. The important role of the parameters of two selective models in the adsorption process was discussed in Section 3.2.…”