Divalent Ion Selectivity in Capacitive Deionization with Vanadium Hexacyanoferrate: Experiments and Quantum?Chemical Computations

نویسندگان

چکیده

Selective removal of ions from water via capacitive deionization (CDI) is relevant for environmental and industrial applications like purification, softening, resource recovery. Prussian blue analogs (PBAs) are proposed as an electrode material selectively removing cations water, based on their size. So far, PBAs used in CDI selective toward monovalent ions. Here, vanadium hexacyanoferrate (VHCF), a PBA, introduced new hybrid setup to remove divalent water. These electrodes prefer Ca2+ over Na+, with separation factor, ?Ca/Na ?3.5. This finding contrasts the observed ion selectivity by PBA electrodes. opposite behavior understood density functional theory simulations. Furthermore, coating VHCF conducting polymer (poly-pyrrole, doped poly-styrenesulphonate) prevents contamination treated following degradation electrode. facile modular method can be effortlessly extended other electrodes, limiting extent during repeated cycling. study paves way tunable while extending library that successfully (selective) CDI.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Energy breakdown in capacitive deionization.

We explored the energy loss mechanisms in capacitive deionization (CDI). We hypothesize that resistive and parasitic losses are two main sources of energy losses. We measured contribution from each loss mechanism in water desalination with constant current (CC) charge/discharge cycling. Resistive energy loss is expected to dominate in high current charging cases, as it increases approximately l...

متن کامل

A Comparative Study between Membrane Capacitive Deionization and Capacitive Deionization from Isotherms and Kinetics

Membrane capacitive deionization (MCDI) is a promising technique to achieve the desalination. This novel technique can largely improve the desalination efficiency of capacitive deionization (CDI) by introducing ion-exchange membranes into CDI. This paper presents a comparative study on the electrosorptive performances of CDI and MCDI based on single walled carbon nanotubes electrodes in NaCl so...

متن کامل

Time-dependent ion selectivity in capacitive charging of porous electrodes.

In a combined experimental and theoretical study, we show that capacitive charging of porous electrodes in multicomponent electrolytes may lead to the phenomenon of time-dependent ion selectivity of the electrical double layers (EDLs) in the electrodes. This effect is found in experiments on capacitive deionization of water containing NaCl/CaCl(2) mixtures, when the concentration of Na(+) ions ...

متن کامل

Water desalination using capacitive deionization with microporous carbon electrodes.

Capacitive deionization (CDI) is a water desalination technology in which salt ions are removed from brackish water by flowing through a spacer channel with porous electrodes on each side. Upon applying a voltage difference between the two electrodes, cations move to and are accumulated in electrostatic double layers inside the negatively charged cathode and the anions are removed by the positi...

متن کامل

Laser-induced fluorescence visualization of ion transport in a pseudo-porous capacitive deionization microstructure

In this paper, a microfluidic experimental setup is introduced to study the ionic transport in an artificial capacitive deionization (CDI) cell. CDI is a promising desalination technique, which relies on the application of an external electric field and high surface area porous electrodes for ion separation and storage. Photolithography and deep reactive ion etching were used to fabricate a mic...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Advanced Functional Materials

سال: 2021

ISSN: ['1616-301X', '1616-3028']

DOI: https://doi.org/10.1002/adfm.202105203