Endowing g‐C₃N₄ Membranes with Superior Permeability and Stability by Using Acid Spacers

Abstract

g‐C3N4 membranes were modulated by intercalating molecules with SO3H and benzene moieties between layers. The intercalation molecules break up the tightly stacking structure of g‐C3N4 laminates successfully and accordingly the modified g‐C3N4 membranes give rise to two orders magnitude higher water permeances without sacrificing the separation efficiency. The sulfonated poly(2,6‐dimethyl‐1,4‐phenylene oxide) (SPPO)/g‐C3N4 with a thickness of 350 nm presents an exceptionally high water permeance of 8867 L h−1 m−2 bar−1 and 100 % rejection towards methyl blue, while the original g‐C3N4 membrane with a thickness of 226 nm only exhibits a permeance of 60 L h−1 m−2 bar−1. Simultaneously, SO3H sites firmly anchor nitrogen with base functionality distributing onto g‐C3N4 through acid–base interactions. This enables the nanochannels of g‐C3N4 based membranes to be stabilized in acid, basic, and also high‐pressure environments for long periods.

Surface Engineering of g‐C3N4 by Stacked BiOBr Sheets Rich in Oxygen Vacancies for Boosting Photocatalytic Performance

“…87‐1526) were located at 12.6° 2 θ and 27.7° 2 θ , respectively. The (002) peak with greater intensity derives from interlayer stacking of conjugated aromatic ring segments, whereas the weaker (100) peak is formed by an in‐plane structural repeating motif in the N‐linked heterocyclic system . The diffraction peaks of BiOBr‐OV are indexed to the P 4/ nmm tetragonal phase BiOBr (JCPDS no.…”

Antibiotics Separation with MXene Membranes Based on Regularly Stacked High‐Aspect‐Ratio Nanosheets

“…Tw o-dimensional (2D) laminated membranes with atomlevel sieving ability, [7] such as graphene films, [8] have attracted tremendous interest in separation and purification fields. Such membranes exhibit high permeance and good rejection in organic solvent nanofiltration [9] and ion sieving.…”

A transport channel-regulated MXene membrane via organic phosphonic acids for efficient water permeation

“…The membranes with larger loading of Ti 3 C 2 T x nanosheets give higher rejection and lower permeance due to fewer defects and larger transmission resistance, in consistent with the results on graphene and other 2D materialsbased membranes. 28 A rejection of higher than 95% for CR can be achieved by pure MXene membranes with loading above 240 mg m -2 . Given the trade-off between permeance and rejection, the MXene membranes with the loading of 240 mg m -2 were chosen as benchmark for subsequent separation tests.…”