Imaging adsorption of iodide on single Cu2O microparticles reveals the acid activation mechanism

Huang，Wei1; Li，Hua2; Yu，Ling1; Lin，Ying1; Lei，Yuting1; Jin，Luyue1; Yu，Haili1; He，Yi1

2021-10-15

10.1016/j.jhazmat.2021.126539

JOURNAL OF HAZARDOUS MATERIALS   影响因子和分区

0304-3894

1873-3336

Imaging an adsorption reaction taking place at the single-particle level is a promising avenue for fundamentally understanding the adsorption mechanism. Here, we employ a dark-field microscopy (DFM) method for in situ imaging the adsorption process of I on single CuO microparticles to reveal the acid activation mechanism. Using the time-lapsed DMF imaging, we find that a relatively strong acid is indispensable to trigger the adsorption reaction of I on single CuO microparticle. A hollow microparticle with the increase in size is obtained after the adsorption reaction, causing the enhancement of the scattering intensity. Correlating the change of the scattering light intensity or particle size with adsorption capacity of I, we quantitatively analyze the selective uptake, slightly heterogeneous adsorption behavior, pH/temperature-dependent adsorption capacity, and adsorption kinetics as well as isotherms of individual CuO microparticles for I. Our observations demonstrate that the acid-initiated Kirkendall effect is responsible for the high-reaction activity of single CuO microparticles for adsorption of I in the acidic environment, through breaking the unfavorable lattice energy between CuO and CuI as well as generating high-active hollow intermediate microparticle.

Acid activation mechanism Cuprous oxide Iodine adsorption Kirkendall effect Single-particle imaging

SCI ; EI

英语

其他

WOS:000696928100003

20212910649217

Chemical activation ; Copper oxides ; Diffusion ; Particle size ; Particle size analysis ; Reaction intermediates

Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Materials Science:951

ENGINEERING

2-s2.0-85110190246

Scopus

1.National Collaborative Innovation Center for Nuclear Waste and Environmental Safety,School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang,621010,China
2.SUSTech Core Research Facilities,Southern University of Science and Technology,Shenzhen,518055,China

Huang，Wei,Li，Hua,Yu，Ling,et al. Imaging adsorption of iodide on single Cu2O microparticles reveals the acid activation mechanism[J]. JOURNAL OF HAZARDOUS MATERIALS,2021,420.

Huang，Wei.,Li，Hua.,Yu，Ling.,Lin，Ying.,Lei，Yuting.,...&He，Yi.(2021).Imaging adsorption of iodide on single Cu2O microparticles reveals the acid activation mechanism.JOURNAL OF HAZARDOUS MATERIALS,420.

Huang，Wei,et al."Imaging adsorption of iodide on single Cu2O microparticles reveals the acid activation mechanism".JOURNAL OF HAZARDOUS MATERIALS 420(2021).