Comparative study of electrosorption performance of solar reduced graphene oxide in flow-between and flow-through capacitive deionization architectures

Datar, Shreerang D.; Mohanapriya, K.; Ahirrao, Dinesh J.; Jha, Neetu

doi:10.1016/j.seppur.2020.117972

Cited by 19 publications

(4 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The salt removal efficiency, often known as SRE [ 84 ], is defined as follows:

where

and

are the starting and final feed water salt concentrations in mg/L. The salt adsorption rate (SAR) is the ratio of SAC by the operation time t, whereas the salt adsorption capacity (

) is the total mass of ions removed by the total mass of electrodes (

) during the sorption stage [ 85 , 86 ].

…”

Section: Methodsmentioning

confidence: 99%

A Comparison of Capacitive Deionization and Membrane Capacitive Deionization Using Novel Fabricated Ion Exchange Membranes

2023

View full text Add to dashboard Cite

Another technique for desalination, known as membrane capacitive deionization (MCDI), has been investigated as an alternative. This approach has the potential to lower the voltage that is required, in addition to improving the ability to renew the electrodes. In this study, the desalination effectiveness of capacitive deionization (CDI) was compared to that of MCDI, employing newly produced cellulose acetate ion exchange membranes (IEMs), which were utilized for the very first time in MCDI. As expected, the salt adsorption and charge efficiency of MCDI were shown to be higher than those of CDI. Despite this, the unique electrosorption behavior of the former reveals that ion transport via the IEMs is a crucial rate-controlling step in the desalination process. We monitored the concentration of salt in the CDI and MCDI effluent streams, but we also evaluated the pH of the effluent stream in each of these systems and investigated the factors that may have caused these shifts. The significant change in pH that takes place during one adsorption and desorption cycle in CDI (pH range: 2.3–11.6) may cause problems in feed water that already contains components that are prone to scaling. In the case of MCDI, the fall in pH was only slightly more noticeable. Based on these findings, it appears that CDI and MCDI are promising new desalination techniques that has the potential to be more ecologically friendly and efficient than conventional methods of desalination. MCDI has some advantages over CDI in its higher salt removal efficiency, faster regeneration, and longer lifetime, but it is also more expensive and complex. The best choice for a particular application will depend on the specific requirements.

show abstract

“…The salt removal efficiency, often known as SRE [ 84 ], is defined as follows:

where

and

are the starting and final feed water salt concentrations in mg/L. The salt adsorption rate (SAR) is the ratio of SAC by the operation time t, whereas the salt adsorption capacity (

) is the total mass of ions removed by the total mass of electrodes (

) during the sorption stage [ 85 , 86 ].

…”

Section: Methodsmentioning

confidence: 99%

A Comparison of Capacitive Deionization and Membrane Capacitive Deionization Using Novel Fabricated Ion Exchange Membranes

2023

View full text Add to dashboard Cite

show abstract

“…The synthesis of graphene oxide (GO) and solar reduced graphene oxide (SRGO) was performed as reported earlier by our group. 30 The synthesis procedure of GO is explained in the supplementary information. In order to obtain reduced graphene oxide, direct sunlight was focused by a convex lens on the as-prepared dried GO sheet.…”

Section: Methodsmentioning

confidence: 99%

Solar reduced graphene oxide decorated with manganese dioxide nanostructures for brackish water desalination using asymmetric capacitive deionization

Datar,

Kumar,

Sawant

et al. 2023

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The SAC obtained was 21.58 mg/g because of good electrical conductivity and efficient ion transport due to lower charge transfer resistance. Our group synthesized solar reduced graphene oxide (SRGO) in which ordinary graphene oxide sheet was reduced by using direct sunlight, which obtained specific surface area of 476 m 2 /g (Datar et al, 2021). SRGO obtained specific capacitance of 126 F/g and SAC of 28.3 mg/g due to high specific surface area and better pore size distribution.…”

Section: Graphene-based Materialsmentioning

confidence: 99%

Recent progress in materials and architectures for capacitive deionization: A comprehensive review

Datar

Mane

Jha

2022

Water Environment Research

Self Cite

View full text Add to dashboard Cite

Capacitive deionization is an emerging and rapidly developing electrochemical technique for water desalination across the globe with exponential growth in publications. There are various architectures and materials being explored to obtain utmost electrosorption performance. The symmetric architectures consist of the same material on both electrodes, while asymmetric architectures have electrodes loaded with different materials. Asymmetric architectures possess higher electrosorption performance as compared with that of symmetric architectures owing to the inclusion of either faradaic materials, redox‐active electrolytes, or ion specific pre‐intercalation material. With the materials perspective, faradaic materials have higher electrosorption performance than carbon‐based materials owing to the occurrence of faradaic reactions for electrosorption. Moreover, the architecture and material may be tailored in order to obtain desired selectivity of the target component and heavy metal present in feed water. In this review, we describe recent developments in architectures and materials for capacitive deionization and summarize the characteristics and salt removal performances. Further, we discuss recently reported architectures and materials for the removal of heavy metals and radioactive materials. The factors that affect the electrosorption performance including the synthesis procedure for electrode materials, incorporation of additives, operational modes, and organic foulants are further illustrated. This review concludes with several perspectives to provide directions for further development in the subject of capacitive deionization. Practitioner Points Capacitive deionization (CDI) is a rapidly developing electrochemical water desalination technique with exponential growth in publications. Faradaic materials have higher salt removal capacity (SAC) because of reversible redox reactions or ion‐intercalation processes. Combination of CDI with other techniques exhibits improved selectivity and removal of heavy metals. Operational parameters and materials properties affect SAC. In future, comprehensive experimentation is needed to have better understanding of the performance of CDI architectures and materials.

show abstract

Comparative study of electrosorption performance of solar reduced graphene oxide in flow-between and flow-through capacitive deionization architectures

Cited by 19 publications

References 47 publications

A Comparison of Capacitive Deionization and Membrane Capacitive Deionization Using Novel Fabricated Ion Exchange Membranes

A Comparison of Capacitive Deionization and Membrane Capacitive Deionization Using Novel Fabricated Ion Exchange Membranes

Solar reduced graphene oxide decorated with manganese dioxide nanostructures for brackish water desalination using asymmetric capacitive deionization

Recent progress in materials and architectures for capacitive deionization: A comprehensive review

Contact Info

Product

Resources

About