Preparation of Reduced Graphene Oxide/Poly(acrylamide) Nanocomposite and Its Adsorption of Pb(II) and Methylene Blue

Abstract

Carboxyl groups at the periphery of reduced graphene oxide (RGO) sheets are converted to amine groups by reaction with N-hydroxysuccinimide and 1,3-diaminopropane, and a free-radical polymerization initiator is anchored to the RGO sheets. Poly(acrylamide) (PAM) polymer brushes on RGO sheets (RGO/PAM) are synthesized by in situ free-radical polymerization. The heavy metals, Pb(II), and the benzenoid compounds, methylene blue, (MB) were selected and adsorbed by RGO/PAM composites, and the adsorption capacity of RGO/PAM for Pb(II) and MB was measured. The experimental data of RGO/PAM isotherms for Pb(II) and MB followed the Langmuir isotherm model. The RGO/PAM displays adsorption capacities as high as 1000 and 1530 mg/g for Pb(II) and MB, respectively, indicating RGO/PAM is a good adsorbent for the adsorption of Pb(II) and MB. The adsorption kinetics of Pb(II) and MB onto RGO/PAM can be well fitted to the pseudo-second-order model. The adsorption processes of Pb(II) and MB onto RGO/PAM are spontaneous at 298, 308, and 318 K.

Polyethyleneimine as a novel desorbent for anionic organic dyes on layered double hydroxide surface

“…S5 and Table S2. The negative value of DH (À17.793 kJ/mol) demonstrated the exothermic nature of the adsorption process [33].…”

Graphene oxide: A promising nanomaterial for energy and environmental applications

“…Furthermore, the poly(diallyldimethylammonium chloride)-GO hybrid exhibited high removal efficiency for both ponceau S (PS) and trypan blue (TB) owing to the strong π-π stacking and anion-cation interactions [292]. The poly(acrylamide)-RGO nanocomposite showed enormous attraction for both Pb(II) ions and MB simultaneously (1000 mg g À g for Pb(II) and 1530 mg g À g for MB, respectively) [293].…”

Recent advances in applications of nanomaterials for sample preparation

“…A summary of recent applications of metal and metal oxide nanoparticles in sample preparation is present in Table 2. blue adsorption with capacities of 1000 and 1530 mg/g for Pb(II) and methylene blue, respectively, which were higher than those of pristine graphene [74], GO [75], unmodified reduced graphene oxide (RGO) [73] and EDTA modified GO/RGO [76].…”

“…Because of their super large surface area and flat structure, graphene and graphene derivatives have become significant parts in composite materials. Wen et al[73] reported reduced graphene oxide/poly(acrylamide) nanocomposite for Pb(II) and methylene…”