Graphene has attracted multidisciplinary study because of its unique physicochemical properties. Herein, few-layered graphene oxide nanosheets were synthesized from graphite using the modified Hummers method, and used as sorbents for removal Cd(II) Co(II) ions large volumes aqueous solutions. The effects pH, ionic strength, humic acid on sorption investigated. results indicated that was strongly dependent pH weakly strength. abundant oxygen-containing functional groups surfaces played an...

A kind of sulfonated graphene (around 3 nm thick) with high dispersion properties has been synthesized. It is demonstrated to adsorb persistent organic aromatic pollutants effectively from aqueous solutions. The adsorption capability the prepared nanomaterials approaches ∼2.3–2.4 mmol g−1 for naphthalene and 1-naphthol, which one highest capabilities today's nanomaterials. This highly effective adsorbent may be a promising candidate remove chemicals large volumes opens new door cost...

A bimetallic-structured ternary phosphide (NiCo2 Px ) as a novel pH-universal electrocatalyst for hydrogen evolution reaction is presented. It exhibits both high activity and long-term stability in all the tested alkaline, neutral, acidic media. The excellent catalytic performance endows it with bright future large-scale electrochemical water splitting industry.

As a newly developed material, carbon gels have been receiving considerable attention due to their multifunctional properties. Herein, we present facile, green, and template-free route toward sponge-like carbonaceous hydrogels aerogels by using crude biomass, watermelon as the source. The obtained three-dimensional (3D) flexible are made of both nanofibers nanospheres. porous (CGs) highly chemically active show excellent mechanical flexibility which enable them be good scaffold for synthesis...

Graphene oxide-supported polyaniline (PANI@GO) composites were synthesized by chemical oxidation and characterized SEM, Raman FT-IR spectroscopy, TGA, potentiometric titrations, XPS. The characterization indicated that PANI can be grafted onto the surface of GO nanosheets successfully. sorption U(VI), Eu(III), Sr(II), Cs(I) from aqueous solutions as a function pH initial concentration on PANI@GO was investigated. maximum capacities at 3.0 T = 298 K calculated Langmuir model 1.03, 1.65, 1.68,...

In this work, oxidized multiwall carbon nanotubes (MWCNTs) were used as a novel adsorbent for removing Ni(II) from aqueous solution. The adsorption of onto MWCNTs was studied function contact time, pH, ionic strength, MWCNT concentration, and temperature. results showed that is strongly dependent on pH concentration and, to lesser extent, strength. Kinetic data indicated the process achieved equilibrium within 40 min follows pseudo-second-order rate equation. fit Langmuir model its...

Few-layered graphene oxide (FGO) was synthesized from graphite by using the modified Hummers method, and characterized scanning electron microscopy, atomic force powder X-ray diffraction, photoelectron spectroscopy Raman spectroscopy. The prepared FGO used to adsorb Pb(II) ions aqueous solutions. abundant oxygen-containing groups on surfaces of played an important role in ion adsorption FGO. dependent pH values independent ionic strength. mainly dominated strong surface complexation. From...

The adsorption and desorption of U(VI) on graphene oxides (GOs), carboxylated GOs (HOOC-GOs), reduced (rGOs) were investigated by batch experiments, EXAFS technique, computational theoretical calculations. Isothermal adsorptions showed that the capacities > HOOC-GOs rGOs, whereas desorbed amounts rGOs kinetics. According to analysis, inner-sphere surface complexation dominated at pH 4.0, outer-sphere rGO was observed which consistent with modeling. Based calculations, binding energy...

This paper examines the adsorption of Pb(II) and a natural organic macromolecular compound (humic acid, HA) on polyacrylamide (PAAM) -grafted multiwalled carbon nanotubes (denoted as MWCNTs/PAAM), prepared by an N2-plasma-induced grafting technique. The mutual effects HA/Pb(II) HA MWCNTs/PAAM, well pH, ionic strength, concentrations, addition sequences were investigated. results indicated that strongly dependent pH strength. presence led to strong increase in at low decrease high whereas...

Abstract Biochar (BC) has exhibited a great potential to remove water contaminants due its wide availability of raw materials, high surface area, developed pore structure, and low cost. However, the application BC for remediation many limitations. Driven by intense desire overcoming unfavorable factors, growing number researchers have carried out produce BC-based composite which not only improved physicochemical properties BC, but also obtained new material combined advantages other...

Graphene oxide/Fe3O4 (GO/Fe3O4) composites were synthesized and characterized by scanning electron microscopy, transmission X-ray photoelectron spectroscopy. The removal of Cu(II) a natural organic macromolecule (fulvic acid (FA)) GO/Fe3O4 was investigated. mutual effects FA/Cu(II) on FA sorption onto GO/Fe3O4, as well the effect pH, ionic strength, concentrations, addition sequences examined. results indicated that strongly dependent pH independent indicating mainly dominated inner-sphere...

The interaction mechanism between Eu(III) and graphene oxide nanosheets (GONS) was investigated by batch extended X-ray absorption fine structure (EXAFS) spectroscopy modeling techniques. effects of pH, ionic strength, temperature on adsorption GONS were evaluated. results indicated that strength had no effect GONS. maximum capacity at pH 6.0 T = 298 K calculated to be 175.44 mg·g(-1), much higher than any currently reported. thermodynamic parameters from temperature-dependent isotherms...

Graphitic carbon nitride (g-C3N4), with a moderate band gap (∼2.7 eV), high chemical and thermal stability, has been the hotspot in environmental photocatalysis. However, its performance is still unsatisfactory because of insufficient absorption visible light, poor surface area, low electronic conductivity recombination rate photogenerated electron-hole pairs. The modification g-C3N4 could overcome these problems to improve photocatalytic properties. Among various strategies, element doping...

Adsorption of 4-n-nonylphenol (4-n-NP) and bisphenol A (BPA) on magnetic reduced graphene oxides (rGOs) as a function contact time, pH, ionic strength humic acid were investigated by batch techniques. 4-n-NP BPA independent pH at 3.0- 8.0, whereas the slightly decreased adsorption was observed 8.0-11.0. kinetics isotherms rGOs can be satisfactorily fitted pseudo-second-order kinetic Freundlich model, respectively. The maximum capacities 6.5 293 K 63.96 48.74 mg/g for BPA, respectively, which...