Self-reporting electroswitchable colorimetric platform for smart ammonium recovery from wastewater

Area of Science:

• Environmental Chemistry
• Materials Science
• Electrochemistry

Background:

• Ammonium recovery from wastewater is crucial for resource sustainability and pollution control.
• Existing methods often lack efficiency, selectivity, or real-time monitoring capabilities.
• Developing advanced materials for smart resource recovery is a key challenge.

Purpose of the Study:

• To develop an advanced self-reporting electroswitchable colorimetric platform (SECP) for smart ammonium recovery.
• To investigate the selective adsorption and electrically stimulated desorption of ammonium.
• To establish a visual, real-time monitoring system for ammonium recovery.

Main Methods:

• Utilized a Prussian blue/Prussian white (PB/PW) redox couple on a film electrode.
• Employed electrochemical intercalation for selective ammonium adsorption.
• Applied voltage-controlled deintercalation for ammonium desorption.
• Established quantitative colorimetric analysis using RGB values for real-time monitoring.

Main Results:

• Achieved selective ammonium adsorption with a selectivity coefficient of 3-19.
• Demonstrated high adsorption capacity (3.2 mmol g^-1) and 99% desorption efficiency.
• Established a quantitative colorimetric method (R² = 0.986) for real-time ammonium monitoring.
• Showcased excellent cyclic stability over five cycles with consistent performance.

Conclusions:

• The SECP offers electroswitchable, selective, and self-reporting functionalities for smart ammonium recovery.
• This platform represents a paradigm shift towards more efficient and intelligent wastewater treatment and resource recovery.
• The technology enhances sustainability by enabling effective ammonium recovery from wastewater.