Abstract
Hardness ions mainly including Ca2+ and Mg2+ can cause water quality issue. Softening of hard water is still challenging nowadays. Capacitive deionization (CDI) has attracted much attention in recent years because of its high efficiency, environmental-friendliness and low energy consumption. Mordenite is a porous ion exchange material. Herein, the porous mordenite modified activated carbon (MOR-AC) was used as cathode to selectively remove Ca2+ and Mg2+ by CDI technique. At the optimal MOR doping amount, the MOR-AC electrode shows good wettability and high specific capacitance of 162 F/g. The removal amount of Ca2+ ions on the MOR-AC cathode reached 248 μmol/g, much higher than that on the AC electrode (164 μmol/g). Distinct from AC electrode, the MOR-AC electrode delivers a much enhanced selectivity to hardness ions in multi-salt mixture solution. In the synthetic hard water, the MOR-AC electrode displays a highly selective adsorption to Ca2+ and Mg2+ with the selectivity coefficient αCa2+ Na+ and αMg2+ Na+ of 8.0 and 7.5, respectively. This CDI device is very stable and regenerable, and the adsorption capacity of Ca2+ retains 87% after 50 cycles in hard water. In addition, the scaling of electrode has been efficiently inhibited.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
