A novel photo-assisted electrochemically switched ion exchange technology for selective recovery of bromide ions

BiOI with Inherent Photo/Electric Biactivity Recovery I– by Novel Photoassisted Electrochemically Switched Ion Exchange Technology

“…Unless specified, all the experiments were performed using a three-electrode system with a saturated calomel electrode as the reference electrode. The equations for the preparation process are as follows: ,,, …”

“…This unique crystal and electronic structure make BiOX (X = Cl, Br, I) have decent photocatalytic properties and it has been efficiently used in the photocatalytic degradation of organic pollutants . Moreover, in our previous research, BiOX has been used extensively in the application of ESIX. − ,, BiOI has shown remarkable potential in P-ESIX because of its suitable energy band gap (∼1.8 eV) and electrochemical stability. , BiOI is excitable by visible light and accelerates the separation of electron–hole pairs. Furthermore, I – was released/captured from the layered [(Bi 2 O 2 ) 2+ ] selectivity when a reduction/oxidation potential was applied to the film. , For the above reasons, BiOI could be used in the P-ESIX system to improve the adsorption capacity of I – .…”

“…34−36 Accordingly, we proposed a new photoassisted electrochemically switched ion exchange (P-ESIX) technology. 37 In the process of P-ESIX, the inactivated electrons are excited based on the synergy of electricity and the additional light fields thereby improving the recovery capacity of the target ion. The core of this method is to select suitable photoelectroactive ion exchange material (P-EIXM) with optical/electric dual activity and excellent selectivity.…”

“…41 Moreover, in our previous research, BiOX has been used extensively in the application of ESIX. [30][31][32]37,42 BiOI has shown remarkable potential in P-ESIX because of its suitable energy band gap (∼1.8 eV) and electrochemical stability. 43,44 BiOI is excitable by visible light and accelerates the separation of electron−hole pairs.…”

“…The migration rates of electrons and the number of free electrons directly affect the adsorption efficiency of target ions. Apart from the electric field, the light field can also realize the excitation of electrons. − Accordingly, we proposed a new photoassisted electrochemically switched ion exchange (P-ESIX) technology . In the process of P-ESIX, the inactivated electrons are excited based on the synergy of electricity and the additional light fields thereby improving the recovery capacity of the target ion.…”