Effect of competing ions and causticization on the ammonia adsorption by a novel poly ligand exchanger (PLE) ammonia adsorption reagent.
In this paper, a poly ligand exchanger, Cu(II)-loaded chelating resin named ammonia adsorption reagent (AMAR), bearing the functional group of weak iminodiacetate acid, was prepared to efficiently remove ammonia from solutions. Batch adsorption equilibrium experiments were conducted under a range of conditions. The effects of pH on the removal of ammonia by AMAR were investigated at 25 °C. The copper loaded on the resin forms a complex with NH3in solution under alkaline condition. The effect of alkaline dosage (AD) on the ammonia adsorption was investigated. The maximum breakthrough bed volumes were obtained when the AD was set as 0.75 mmol OH-/mL. The higher AD did not guarantee the better ammonia removal efficiency due to the forming of Cu(OH)2precipitate between OH-in solutions and Cu(II) on the resin. The effect of competing ions on the adsorption breakthrough curve of virgin AMAR and causticized AMAR was also investigated. The results demonstrated that the existence of competing ions had a negative impact on the adsorption capacity for both virgin AMAR and causticized AMAR. After causticization, the AMAR was more resistant to the competing ions comparing with virgin AMAR. The bivalent Ca2+affects the ammonia adsorption more than does the monovalent Na+.
Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China and Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China E-mail: zhouzhou2548@outlook.com.
Quanzhou
Q
Chen
Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China and Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China E-mail: zhouzhou2548@outlook.com.
Kanggen
K
Zhou
Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China and Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China E-mail: zhouzhou2548@outlook.com.
Yuanjuan
Y
Hu
Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China and Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China E-mail: zhouzhou2548@outlook.com.
Fang
F
Liu
Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China and Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China E-mail: zhouzhou2548@outlook.com.
Aihe
A
Wang
D000327:Adsorption; D000468:Alkalies / Q000737:chemistry; D000641:Ammonia / Q000302:isolation & purification*; D002118:Calcium / Q000032:analysis; D003300:Copper / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007477:Ions; D007700:Kinetics; D008024:Ligands; D012964:Sodium / Q000032:analysis; D012996:Solutions; D014865:Waste Disposal, Fluid
D000468:Alkalies; D007202:Indicators and Reagents; D007477:Ions; D008024:Ligands; D012996:Solutions; D000641:Ammonia; D003300:Copper; D012964:Sodium; D002118:Calcium