Immobilization of 4-amino-2-hydroxyacetophenone onto silica gel surface and sorption studies of Cu(II), Ni(II), and Co(II) ions

Abstract

The 4-amino-2-hydroxyacetophenone was immobilized onto silica gel modified with\ud 3-aminopropyltrimethoxy silane. The carried reaction is classic condensation reaction. The\ud obtained structure was characterized by infrared spectroscopy and thermo gravimetric analysis.\ud The values of adsorption of Cu(II), Ni(II), and Co(II) ions were detected with an atomic\ud absorption spectrometer. The experiment conditions for effective sorption of the studied\ud metal ions were performed by using batch method. The maximum adsorption capacities\ud and isotherm parameters were calculated with using the Langmuir, Freundlich, and\ud Dubinin-Radushkevich isotherm equations. Thermodynamic parameters such as free energy\ud (ΔG°), entropy (ΔS°), and enthalpy (ΔH°) were also calculated from the experimental results.\ud The sorption results were used to explain the mechanism of the sorption. The modified\ud structure was successfully used in the separation of Cu(II), Ni(II), and Co(II) from the\ud aqueous solutions

Removal of chromium(vi) from polluted wastewater by chemical modification of silica gel with 4-acetyl-3-hydroxyaniline

“…In the third stage, the dried 3-chloropropyl-bonded silica gel (5 g) was mixed with 33 mL of 25% 4-acetyl-3-hydroxyaniline (AHAP) solution in 50 mL of anhydrous toluene 37 and was reuxed under nitrogen for 24 h at 90 C. 38,39 The crude product obtained by the ltration of the suspension was washed with water and ether and then dried at 40 C for 72 h under vacuum to afford Si-CPTS-AHAP. [28][29][30] The possible structure of the synthesized Si-CPTS-AHAP adsorbent is shown in Fig. 1.…”

“…These values are lower than 40 k J mol À1 , indicating the weak interactions of the Cr(VI) metal ions with the Si-CPTS-AHAP adsorbent surface in the specied temperature range. 28,77…”

“…26,27 On the surface of silica gel there are two different types of functional groups; siloxane (Si-O-Si) and silanol (Si-OH). 28,29 The silica gel, used as an adsorbent, has the advantages of being robust against organic solvents, thermal stability and is not capable of swelling. The bonding of a substance to the silica gel (Si) surface is easier than bonding to an organic support surface, and the silica gel (Si) is the most popular adsorbent for surface studies.…”

Adsorption performance of activated carbon synthesis by ZnCl2, KOH, H3PO4 with different activation temperatures from mixed fruit seeds

“…The values of 1/n for AC-Zn1 are <1, so they are an indication of high adsorption intensity. Values of n >1 show suitable adsorption conditions [71]. The Freundlich, Langmuir and Temkin parameters calculated based on the measured data are given in Table 6.…”

Synthesis and Characterization of Magnetite-Alginate Nanoparticles for Enhancement of Nickel and Cobalt Ion Adsorption from Wastewater

“…Removing these metal ions from the sewage stream is an important demand for a healthy setting. Several techniques have been used to eliminate metal ions from wastewater such as exchange of ions, extraction of solvents, flotation, oxidation, and adsorption [1][2][3]. Adsorption has gradually gained a lot of attention since late in perspective of the fact that this technique is essential and it generally has minimal effort and energy in expelling important metal particles from water.…”