Preparation of 2-hydroxy-1-naphthalene Functionalized SBA-15 Adsorbent for the Adsorption of Chromium(III) Ions from Aqueous Solution

Abstract

SBA-15 mesoporous material functionalized with 2-hydroxy-1-naphthaldehyde denoted as Q-SBA-15 was synthesized by using Schiff's base reaction to remove Cr(III) ions from aqueous solution. A series of characterizations were performed to analyze the morphology, pore structure, element distribution and chemical properties of Q-SBA-15.The results showed that BET surface area and pore size of SBA-15 decreased after modified with 2-hydroxy-1-naphthaldehyde, but the surface morphology and crystal structure of SBA-15 did not change significantly. To investigate the adsorption properties of Q-SBA-15 toward Cr(III) ions, effects of solution pH and ionic strength were studied. Moreover, adsorption kinetics, adsorption isotherm models, adsorption thermodynamics, and regeneration performance of Q-SBA-15 were analyzed. Adsorption process toward Cr(III) ions onto Q-SBA-15 was well followed by pseudo-second order kinetic model and Langmuir isotherm model. The maximum adsorption capacity of Q-SBA-15

Highly-efficient removal of Pb (II) from water by mesoporous amino functionalized silica aerogels: Experimental, DFT investigations and Life Cycle Assessment

“…3a) can be used to characterize the structure of the MASA-X samples. All amino-functionalized silica aerogels with different amino group loadings exhibited two diffraction peaks that can be indexed to (100) and ( 200) reflections associated with two-dimensional hexagonal mesostructure, which is consistent with the results reported in the literature [43,44]. However, there was a gradual reduction in the intensity of the (100) diffraction peak and a gradual disappearance of the (200) diffraction peak as the increase amount of KH550, suggesting that the use of the organosilicon source had influenced the formation of the mesoporous structure and had resulted in a gradual decrease in the ordered of the mesostructured [45].…”

Fabrication of the Ordered Mesoporous nZVI/Zr-Ce-SBA-15 Composites Used for Crystal Violet Removal and Their Optimization Using RSM and ANN–PSO

“…According to IUPAC, the curve of the Zr-Ce-SBA-15 and the nZVI/Zr-Ce-SBA-15 composites belongs to the type IV isotherm, and it had obvious pore condensation, indicating that the synthesized materials were of mesoporous structure (Figure 6a,b). The existence of H1-type adsorption shows that the sample had a columnar pore structure, and these characteristics are unique to mesoporous nZVI /Zr-Ce-SBA-15 materials [30]. With an increase in nZVI, the relative pressure range in the hysteresis loop shifted slightly to a higher pressure, indicating that the pore size of the sample increased, which can be verified from the pore size distribution.…”

“…Meanwhile, an obvious H1-type hysteresis loop appeared in the adsorption isotherm. At a high pressure (p/p 0 > 0.9), the N 2 adsorption capacity of nZVI/Zr-Ce-SBA-15 retained an upward trend, which may have been caused by agglomeration between particles [30].…”

“…The peak intensity at 3450 cm −1 obviously became sharp, indicating that there were massive hydroxyl groups on nZVI /Zr-Ce-SBA-15. The peaks at 1064.9 cm −1 and 3450.0 cm −1 can be attributed to the Si-OH vibration peak, while the peak at 1636.8 cm −1 is the absorption peak of free water [30].…”