Abstract Constructing nanolaminate membranes made of two-dimensional graphene oxide nanosheets has gained enormous interest in recent decades. However, a key challenge facing current graphene-based is their poor rejection for monovalent salts due to the swelling-induced weak nanoconfinement and transmembrane co-transport anions cations. Herein, we propose strategy electrostatic-induced ion-confined partitioning reduced membrane breaking correlation cations suppress anion-cation co-transport,...

Nanofiltration (NF) has received much attention for wastewater treatment and desalination. However, NF membranes generally suffer from the trade-off between permeability selectivity. In this work, coenhancement of ion selectivity was achieved through tuning surface charge pore size oxidized carbon nanotube (OCNT) intercalated reduced graphene oxide (RGO) membranes. With increase OCNT content 0 to 83%, were increased. The increased 10.6 L m-2 h-1 bar-1 rejection rate reached 78.1% Na2SO4...

Aqueous ·OH reaction rate constants (kOH) for organophosphate esters (OPEs) are essential assessing their environmental fate and removal potential in advanced oxidation processes (AOPs). Herein experimental silico approaches were adopted to obtain kOH values a variety of OPEs. The determined 18 OPEs varies from 4.0 × 108 M–1 s–1 1.6 1010 s–1. Based on the values, quantitative structure–activity relationship model that involves molecular structural information number heavy atoms, content...

Manipulating carbon nanotubes (CNTs) through engineering into advanced membranes with superior performance for disinfection and decontamination of water shows great promise but is challenging. In this paper, a facile assembly CNTs novel hollow fiber tunable inner/outer diameters structures developed the first time. These free-standing composed entirely feature porosity 86±5% permeation flux about 460±50 L m(-2) h(-1) at pressure differential 0.04 MPa across membrane. The randomly oriented...

Theoretical permeability of membrane is inversely proportional to its thickness, which indicates ultrathin membranes will be extremely permeable. Inspired by the atomic thickness graphene, herein we report a four-layered graphene with about 2 nm. The facilely fabricated directly punching complete sheet through selective removal some carbon atoms metal oxide nanoparticles at high temperature. Their perpendicular pore channels spanning whole could, great extent, reduce hydrodynamic resistance...

Abstract Nanocarbon-based conductive membranes, especially carbon nanotube (CNT)-based have tremendous potential for wastewater treatment and water purification because of their excellent permeability selectivity, as well electrochemically enhanced performance (e.g., improved antifouling ability). However, it remains challenging to prepare CNT membranes with high structural stability electrical conductivity. In this study, a highly electroconductive structurally stable polyphenylene/CNT...

Carbon nanomaterial-based membranes exhibit fascinating permselectivity for water and wastewater treatment, their performance could be further improved under electrochemical assistance, benefiting from good electrical conductivity.

Reduced graphene oxide (rGO) could be theoretically used to construct highly permeable laminar membranes with nearly frictionless nanochannels for water treatment. However, their pristine (sp2 C–C) regions usually restack into impermeable channels as a result of van der Waals interactions, resulting in much low permeance. In this study, we demonstrate that the restacked electrochemically expanded form ultrafast transport by providing positive potential (e.g., +1.00 V vs SCE) rGO membrane....

Membrane fouling is a major challenge for the membrane separation technique in water treatment. Herein, an MXene ultrafiltration with good electroconductivity and hydrophilicity was prepared showed excellent resistance under electrochemical assistance. The fluxes negative potential were 3.4, 2.6 2.4 times higher than those without external voltage during treatment of raw containing bacteria, natural organic matter (NOM), coexisting bacteria NOM, respectively. During actual surface 2.0 V...

Graphene oxide (GO) membranes with nanoconfined interlayer channels theoretically enable anomalous nanofluid transport for ultrahigh filtration performance. However, it is still a significant challenge current GO laminar to achieve ultrafast water permeation and high ion rejection simultaneously, because of the contradictory effect that exists between water-membrane hydrogen-bond interaction ion-membrane electrostatic interaction. Here, we report vertically aligned reduced (VARGO) membrane...

The excellent permeability and selectivity of reduced graphene oxide (rGO) membranes have been demonstrated both theoretically experimentally; however, strategies for the fabrication highly stable, antifouling rGO with facile recovery after fouling rarely investigated. In this work, we report a structurally durable rGO-based hollow fiber membrane that allows high-pressure (at least 1 bar) back-flushing. This is achieved by sandwiching layer between carbon nanotube (CNT) protective...

Laminar graphene (including reduced oxide (rGO)) membranes have recently received significant attention because of their potentially excellent permeability and selectivity; however, fouling problem associated with the foulants blocked within nanochannels has not been thoroughly investigated. This study confirms blockage molecules rGO by investigating rejection ratios at various membrane thicknesses then presents an electrochemical in situ cleaning strategy (with as anode) aimed oxidative...

Graphene is promising in the construction of next-generation nanofiltration membranes for wastewater treatment and water purification. However, application graphene-based has still been prohibited by their deficiencies permeability ion rejection. Herein, regulating 2D channel enhancing charge density are co-adopted simultaneous enhancement flux salt rejection reduced graphene oxide (rGO) through intercalation molybdenum sulfide (MoS2) nanosheets external electrical assistance. The fabricated...

Understanding the mechanism underlying controllable transmembrane transport observed in biological membranes benefits development of next-generation separation for a variety important applications. In this work, on basis common structural features cell membranes, very simple biomimetic membrane system exhibiting gated performance has been constructed using all-carbon-nanotube (CNT)-based hollow-fiber membranes. The conductive CNT with hydrophobic pore channels can be positively or negatively...

Artificial ion channels with controllable mono/monovalent cation separation fulfill important roles in biomedicine, separation, and energy conversion. However, it remains a daunting challenge to develop an artificial channel similar biological due ion-ion competitive transport lack of ion-gating ability channels. Here, we report conductive MXene membrane polydopamine-confined angstrom-scale propose voltage gating charge comediation strategy concurrently achieve gated selective separation....