Tunable Nanoscale Interlayer of Graphene with Symmetrical Polyelectrolyte Multilayer Architecture for Lithium Extraction

Abstract

Graphene, a 2D sp2‐hybridized carbon sheet is a hot topic in the fields of materials science and chemistry. Here, a symmetrical multilayer architecture of graphene is designed by grafting of sulfonated 4,4′‐ diaminodiphenyl sulfone (SDDS) with the ample sulfonate groups and tunable interlayer spacing to exhibit the Li+ extraction from ionic mixtures with Na+, Mg2+ and Ca2+. Under the application of an electric field, the selective separation of cations can be achieved by controlling the flow channels of negatively charged ions (≈0.48 nm) during the synthesis of rGO‐SDDS‐rGO membrane. The result shows that the ion selectivity of the rGO‐SDDS‐rGO membrane is Na+ > Li+ > Ca2+ > Mg2+ and the absolute separation efficiency values of Li+/Mg2+ and Li+/Ca2+ are as high as 85.32 and 80.81%, respectively.

The Theory and Practice Value of Tunable Nanoscale Interlayer of Graphene: Response to Comment on “Tunable Nanoscale Interlayer of Graphene with Symmetrical Polyelectrolyte Multilayer Architecture for Lithium Extraction”

“…Only water vapor aligned in a monolayer can permeate through the nanochannel . In this work, the average interlayer spacing of randomly stacked graphene layers was about 0.34 nm (measured by XRD), as shown in Figure , GO, reducted graphene oxide (rGO) and 4,4′‐diaminodiphenyl sulfone (SDDS) …”

A Review on Ion-exchange Membranes Fouling and Antifouling During Electrodialysis Used in Food Industry: Cleanings and Strategies of Prevention

“…Traditionally, surface modification was used to improve the monovalent selectivity and permselectivity of membranes in electrodialysis processes and avoid scaling and mineral deposits by the addition of oppositely charged layer [83]. Several techniques are experimented for IEMs surface coating, such as plasma induced deposition [85], grafting [86], layer-by-layer assembly [87,88], dip coating [89] or electrodeposition [90]. It has been widely acknowledged that increasing the hydrophilicity of the membrane surface and imparting an opposit surface charge to the functional sites charge are very effective means to the prevention of fouling through electrostatic repulsion.…”

Silver-modified porous polystyrene sulfonate derived from Pickering high internal phase emulsions for capturing lithium-ion

“…Aer incubating for 6.0 h, PHIPEs-SS-Ag was collected by centrifugation, and the concentrations of Li + , K + , Mg 2+ , and Na + (ref. 31) in the ltrate were detected by ICP-ES.…”