Enhanced uptake of iodide on Ag@Cu2O nanoparticles.
In order to improve the uptake capacity of Cu2O for I-anions from water, Ag loaded Cu2O composites have been synthesized through a facile method, characterized using SEM, XRD, XPS and applied to remove I-anions under different experimental environments. The results show that the uptake capacity of Ag@Cu2O increased with the increasing Ag doped amount. Meanwhile, the uptake capacity (0.20 mmol g-1) of 1.0%-Ag@Cu2O for the removal of I-anions is ten times higher than that of pure Cu2O (0.02 mmol g-1). Furthermore, a mechanism explaining the highly efficient removal of I-anions has been proposed according to characterization analyses of the composites after adsorption and subsequently been verified by adsorption under visible light experiments. 1.0%-Ag@Cu2O (0.5%-Ag@Cu2O, 0.2%-Ag@Cu2O) shows a high iodide uptake efficiency of 98.5% (77.6%, 37.8%) in the visible light, much higher than that under the darkness (86.3%, 69.7% and 30.8%). In addition, the adsorbent showed excellent selectivity for I-anions in the presence of large concentrations of competitive anions, eg. uptake efficiencies are 78.2%, 62.8%, 70.2% and 77.9% in the presence of the Cl-, CO32-, SO42-and NO3-competitive anions, respectively, and could work in a wide pH range of 3-11. This study is hopefully to prompt Cu2O to become a new and highly efficient adsorbent for iodide adsorb from solutions.
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Ping
P
Mao
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Ying
Y
Liu
Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials (CEM), School of Environmental Sciences and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210004, China.
Yan
Y
Jiao
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Shouwen
S
Chen
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials (CEM), School of Environmental Sciences and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210004, China. Electronic address: yyi301@163.com.
Yi
Y
Yang
D000327:Adsorption; D003300:Copper / Q000737:chemistry*; D006801:Humans; D007454:Iodides / Q000302:isolation & purification / Q000378:metabolism*; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D018030:Silver Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*; D018508:Water Purification / Q000379:methods
D007454:Iodides; D010087:Oxides; D018030:Silver Compounds; D014874:Water Pollutants, Chemical; D014867:Water; D003300:Copper; C040225:disilver oxide; C030973:cupric oxide
Ag@Cu(2)O; Chemical adsorption; Iodide uptake; Selectivity; Uptake capacity