Fluorescence detection and removal of copper from water using a biobased and biodegradable 2D soft material

Abstract

We have developed a green and robust fluorogenic (λ = 410 nm, λ = 510 nm) cellulose membrane using graphene oxide (GO) as a construct for simultaneous copper ion recognition and filtration at environmentally relevant levels. The detection limit and removal limit of Cu are 7.3 × 10 M and 1000 ppm, respectively. The simplicity and scalability achieved for the detection and removal of metal ions in waste water is particularly noteworthy given the significant problems associated with metal ion pollution of drinking water.

Clustering-Triggered Emission of Carboxymethylated Nanocellulose

“…Over several decades, fluorescent organic molecules and nanomaterials have attracted much attention and interest due to their special photophysical properties and wide applications in areas such as bioimaging, organic light-emitting diodes (OLEDs), light-emitting electrochemical cells (LECs), and phototherapy reagents, etc (Schwartz et al, 2007; Qin et al, 2012; Wang et al, 2012; Cheng et al, 2015; Li et al, 2018c). Initially, fluorescent organic molecules are widely employed in inorganic ion detection, drug analysis, etc (Bian et al, 2014; Li et al, 2018b).…”

Recent advances in cellulose-based membranes for their sensing applications

“…Naphthalimide derivatives presented high fluorescence quantum yield, good photo-stability and long emission wavelength, which can be acted as metal ions sensors (Liu et al 2020). Xiao Huining and co-workers constructed a green cellulose membrane (NGC), which coated with graphene oxide (GO) and naphthalimide molecule through hydrogen bonding and pp stacking (Li et al 2018). Because the coordination of piperazine units and Cu 2?…”

“…Naphthalimide derivatives presented high fluorescence quantum yield, good photo-stability and long emission wavelength, which can be acted as metal ions sensors (Liu et al 2020 ). Xiao Huining and co-workers constructed a green cellulose membrane (NGC), which coated with graphene oxide (GO) and naphthalimide molecule through hydrogen bonding and π–π stacking (Li et al 2018 ). Because the coordination of piperazine units and Cu 2+ ions blocked photo-induced electron transfer (PET) effect, the NGC membrane with Cu 2+ appeared a strong fluorescence emission peak at 510 nm compared to the previously NGC membrane without Cu 2+ .…”

Electrochemical Deposition of Copper on Epitaxial Graphene

“…Since graphene enables the detection of single molecules accommodated on its surface [59], it attracts a lot of attention as a highly sensitive and biofriendly material for environmental sensorics [60], including the fast and real-time detection of Copper ions [61]. Two strategies in such a direction have been implemented so far: (i) electrochemical sensing by electrodes covered with functionalized graphene-based materials (reduced graphene oxide, graphene oxide, graphene quantum dots) [62][63][64][65] and (ii) optical sensing using colorimetric and fluorescent probes based on graphene derivatives [66][67][68][69][70][71][72][73][74]. Both approaches present some limitations, mainly linked to the instability and complicated preparation procedure of the working electrode or fluorescence probe, which typically involves surface functionalization and multistage chemical reactions.…”