Adsorption of humic acid from aqueous solution onto unmodified and surfactant-modified chitosan/zeolite composites

Poorly crystalline hydroxyapatite: A novel adsorbent for enhanced fulvic acid removal from aqueous solution

“…In other words, the decrease in adsorption capacity with the increase in the adsorbent dosage was mainly attributed to the unsaturation of the adsorption sites through the adsorption process. Similar findings have been observed for HA removal by surfactant-modified chitosan/zeolite composite [48] and surfactant modified zeolite [49], as well as for nitrobenzene [29] and phenol [41] removal by HAP nanoparticles.…”

“…Spontaneous, endothermic and entropy-increasing processes have also been reported for the adsorption of FA on carbon nanotubes [26], and for HA on surfactant-modified chitosan/zeolite composites [48], bi-functional resin [51], and activated bentonite [58].…”

An innovative zinc oxide-coated zeolite adsorbent for removal of humic acid

“…Furthermore, the adsorption process can remove a large number of toxic substances from the treated water, and has no side effects or secondary pollution [6][7][8][9][10][11][12][13][14][15]. However, one process, granular activated carbon (GAC), is generally effective, but not cost effective, thus new adsorbents are being sought.…”

Enhanced performance of calcium-enriched coal ash for the removal of humic acids from aqueous solution

“…For the removal of HA from water, a number of methods have been reported to date, including adsorption [6][7][8][9][10][11], oxidation [12,13], coagulation [14][15][16] and filtration [17]. Among these, adsorption and coagulation are the most promising processes for removing HA from the aqueous phase, due to their high removal efficiencies.…”