Electrostatic Assembly Method To Fabricate Clay@reduced Graphene Oxide Nanocomposite For Removal Of Dyes

In this paper, we study the clay nanoparticles with a positively charge and thegraphene oxide compound by electrostatic interactions,then the compounds used inthe study of adsorption of dye in water.The thesis has chosen two kinds of naturalclay (attapulgiteand halloysite) used for composite with graphene.Normally,attapulgite short nanorods (ATP) and halloysite nanotubes (HNTs) negativelycharged surface, couldn’tself-assemble with the negatively charged surface ofgraphite oxide (GO) via electrostatic interaction.In order to achieve both electrostaticassembly process, we choose3-ammonia propyl triethoxysilane (APTES)to organicmodify the ATP and HNTs surface.Due to the existence of the amine-tailed shortorganic chains of APATP and APHNTs surface modified, under the certain pH willmake electronegative clay with electropositive surface, so as to realize the compoundof clay and GO.Halloysite nanotubes (HNTs) were dispersed and loaded homogeneously ontothe surface of reduced graphene oxide (rGO) sheets via an electrostatic self-assemblyprocess. The selective modification of outmost surface with γ-aminopropyltriethoxysilane (APTES) was performed. The outmost surface of APTES-HNTs(APHNTs) was converted into positively charged surface under acid condition resultfrom the existence of amine-tailed short organic chains. The similar combinationoccured driven by the electrostatic force between the negative GO sheets and positiveAPHNTs. HNTs@rGO composite (HGC) was fabricated after reduction of GO andinvestigated as adsorbent and electrode material. The superior behavior for rhodamineB (RhB) removal and high performances in supercapacitors highlight the potentialapplications of HGC in waste water treatment and energy storage issues.Attapulgiteneedles (ATP) were dispersed and loaded onto the surface of reducedgraphene oxide (rGO) sheets via an electrostatic self-assembly process. The selectivemodification of ATP’s surface with γ-aminopropyl triethoxysilane (APTES) was performed. The surface of APTES-ATP (APATP) was converted into positivelycharged surface under acid condition result from the existence of amine-tailed shortorganic chains. The combination process occured driven by the electrostatic forcebetween the negative GO sheets and positive APATP. ATP@rGO composite (AGC)was obtained after reduction of GO and investigated as adsorbent. The superiorbehavior for rhodamine B (RhB) and methylene blue (MB) removal highlight thepotential applications of AGC in waste water treatment.Recently, carbonaceous materials are widely used as electrode materials insupercapacitors and batteries, due to their large surface area and high conductivity.This paper also studied the electrochemical properties of HNTs@rGO compositematerial (HGC) as the super capacitor. Indicating that HGC has ideal double-layercapacitive behavior.