Use of 1,3-diaminepropane-3-propyl grafted onto a silica gel as a sorbent for flow-injection spectrophotometric determination of copper (II) in digests of biological materials and natural waters

Determination of Copper in Water Samples after Solid‐phase Extraction Using Dimethylglyoxime‐modified Silica

“…The detection limit of the proposed method is comparable to those obtained by other methods described in the literature [37,[43][44][45]. The corresponding limit of quantification was calculated from ten times the standard deviation of the blank signal and was found to be 20.2 ng mL -1 .…”

“…It could be concluded that the sorption of copper(II) onto DMGMS was monolayer in nature and the maximum monolayer sorption capacity of the sorbent was found to be 71.37 mg g -1 . The adsorption capacity of DMGMS is comparable to and moderately higher than that of many corresponding sorbents reported in the literature [16,[37][38][39][40][41]. The dimensionless separation factor, RL, was also evaluated and calculated according to Eq.…”

Use of statistical design of experiments to evaluate the sorption capacity of 7-amine-4-azaheptylsilica and 10-amine- 4-azadecylsilica for Cu(II), Pb(II), and Fe(III) adsorption

“…This procedure is usually employed in the final treatment of industrial effluents, allowing a decrease of the toxic species to a minimal level. This procedure involves the simple passage of the effluent by a granular medium such as sand [1] or activated charcoal [6], which retains the toxic species by physical adsorption, as well as the use of synthetic adsorbents such as polymeric resins for ion exchange [7], organic groups grafted on textiles [8], or modified silica gel [9][10][11] which are able to selectively retain heavy metals by chelation, ion exchange, electrostatic forces, and microprecipitation on the adsorbent surface.…”

“…The adsorbent can be regenerated afterwards or kept in a dry place without direct contact with the environment [9][10][11]. In this context, in recent years there has been a constant search for new adsorbent materials with high metal adsorption capacity and selectivity [12][13][14][15][16].…”

Removal of Cr(III, VI) by quaternary ammonium and quaternary phosphonium ionic liquids functionalized silica materials

“…Chemically modified silica gel is an attractive sorbent for the extraction and separation of metal ions and various types of compounds, because the silica support does not swell or shrink as polymer resins and unmodified natural materials do [15]. Moreover, the modified silica has a good thermal stability and high metal removal efficiency [16].…”