Pb(II) adsorption by a novel activated carbon ⿿ alginate composite material. A kinetic and equilibrium study

Highly efficient removal of toxic Pb2+ from wastewater by an alginate–chitosan hybrid adsorbent

“…S1, Supporting material, the adsorption capacity for Pb 2+ increased with the initial concentration from 0.1 to 30 mmol L −1 , and then remained stable as concentration was increased further. Thus, the maximum adsorption capacity of Alg‐Chi for Pb 2+ was calculated as 468.5 mg g −1 , which is higher than that of most reported sorbents for Pb 2+ (Table ) …”

“…Thus, the maximum adsorption capacity of Alg-Chi for Pb 2+ was calculated as 468.5 mg g −1 , which is higher than that of most reported sorbents for Pb 2+ (Table 4). [4][5][6][7][8][9][10][11][12][13]15,[20][21][22][23][24][25][26][27] In order to determine the Alg-Chi adsorption capacity for Pb 2+ at its drinking water maximum contaminant limit (MCL: 20 μg L −1 ), we further recorded the adsorption data of Pb 2+ residual concentration between 0 and 220 μg L −1 . Meanwhile, Langmuir [Q e = Q m K L C e /(1 + K L C e )] and Freundlich [Q e = K F C e 1/n ] models wileyonlinelibrary.com/jctb were fitted to these experimental data as shown in Fig.…”

“…Owing to the low cost, multiple functional groups (e.g. −COOH, −OH and − NH 2 ), biodegradability and biocompatibility, sodium alginate and chitosan are most commonly used as functional reagents for treating Pb 2+ ‐containing wastewater . Sodium alginate, produced by brown algae that are abundant in nature, is widely used as a thickener in the food industry and as an antidote for heavy metal poisoning in the field of medicine.…”

“…−COOH, −OH and − NH 2 ), biodegradability and biocompatibility, sodium alginate and chitosan are most commonly used as functional reagents for treating Pb 2+ -containing wastewater. [5][6][7] Sodium alginate, produced by brown algae that are abundant in nature, is widely used as a thickener in the food industry and as an antidote for heavy metal poisoning in the field of medicine. Recent studies have shown that immobilizing alginate onto silica, 8 polyaniline nanofibers, 9 SBA-15, 10 and maghemite 11 can efficiently remove Pb 2+ and Cu 2+ in wastewater.…”

A novel synthesis of TiO2/GO nanocomposite for the uptake of Pb2+ and Cd2+ from wastewater

“…Cd, Cu and Pb) removal from water [11][12][13][14][15]. Recently, the adsorption technique and bioremediation, using nanoadsorbent for heavy metals removal, have been widely applied [16,17]. The preference of adsoption is due to its simplicity, efficiency at very low concentrations, and economical properties [16,17].…”