Adsorption of Cu 2+ on coal fly ash modified with functionalized mesoporous silica

Could Voltammetry be an Effective Alternative Technique to Study Adsorption Kinetics of Electroactive Metal Ions?

“…Despite of that, LSV method could still be widely used, since most of studies about metal ions adsorption involves toxic electroactive metals, such as Pb 2+ , Cu 2+ , Cd 2+ , Hg 2+ , etc. 4–8,19,21,22. It is important to highlight that a large number of studies involving adsorption of electroactive organic species, such as phenolic compounds 23, pesticides 24, drugs 25 and dyes 26 are found in literature.…”

“…Adsorption is often used to pre‐concentrate an analyte prior to its quantification, improving sensitivity and allowing quantification at trace level 1–3. In environmental chemistry, adsorption is mainly used to remove pollutants from water 4–8, with advantages over precipitation or filtration, such as high efficiency and speed, low cost, easy automation, possibility of adsorbent reuse, and selective removal by advanced materials 9. Therefore, there is a huge interest to develop new adsorbent materials, mainly for metal ions removal, which are very toxic and non‐biodegradable pollutants whose environmental concentration has been growing lately.…”

Geopolymer-Bonded Laminated Veneer Lumber as Environmentally Friendly and Formaldehyde-Free Product: Effect of Various Additives on Geopolymer Binder Features

“…Absorption bands at 3450 cm −1 represented the stretching vibration of aliphatic amine (N-H) groups. The broad bands located at about 3300 cm −1 , especially at binders having phenol and grafted silica fume, corresponded to the free and bound -OH and stretching bands of N-H group for phenol and 3-aminopropyl-triethoxysilane, respectively [41,42]. Absorption peak at 1231 cm −1 in the geopolymer binder with phenol flakes corresponded to the C-C-O asymmetric stretch.…”

Dual role of coal fly ash in copper ion adsorption followed by thermal stabilization in a spinel solid solution

“…Since the adsorption capacity is largely affected by the surface area and pore volume of the y ash, the maximum adsorption capacity of copper ions has been reported to be approximately 100 mg g À1 aer the modication of y ash samples. 42 Fig. 2 shows XRD patterns of the copper-adsorbed y ash before and aer thermal treatment at temperatures ranging from 900 to 1050 C. From the XRD pattern of the unsintered copperadsorbed y ash, the main copper-hosting phase was found to be gerhardtite (Cu 4 (NO 3 ) 2 (OH) 6 ; PDF#77-0148).…”