Low Cost Graphene Oxide Modified Alumina Nanocomposite as Solar Light Induced Photocatalyst

Abstract

A new wet chemical methodology is introduced for high quality Al2O3 microflowers using aluminum foil as a cheaper precursor for the first time and sodium dodecyl sulfate as template. The gamma alumina (γ-Al2O3) is prepared with excellent catalytic properties having small crystallite size with decreased band gap in comparison to its bulk state. This can be attributed to morphological planar defects like stepped surfaces in brick morphology. Such planar defects allow electronic transitions under solar light in pure Al2O3. Moreover, a novel heterojunction of Al2O3 and graphene oxide (GO) is developed as an efficient photocatalyst under solar light. Well incorporated GO sheets within the alumina matrix have been presented in SEM images of composites. The marvelous photocatalytic performance of 15.0% GO/Al2O3 hybrid is recorded under solar light. The new composite material possesses the extended spectral response and exhibits reduce electron–hole pair recombination chances due to the incorporation of GO sheets. Furthermore, mechanism and kinetics of degradation are studied. The cost analysis is performed which shows that Al2O3 prepared by this method is 1000 times cheaper than available Al2O3 by Sigma-Aldrich. This investigation leads to economic future development of effective Al2O3 based photoactive materials for catalysis and other solar light induced energy applications.

Enhanced Thermal and Mechanical Properties of 3D Printed Highly Porous Structures Based on γ‐Al2O3 by Adding Graphene Nanoplatelets

“…Although the effect of graphene additions on the thermal conductivity was not evaluated for these highly porous 3D printed γ-Al 2 O 3 structures, significant enhancement in the heat dissipation of chemical reactions has been reported for γ-Al 2 O 3 /rGO nanostructures, being excellent catalyst supports for poly(ethylenimine) aimed at CO 2 removal. [29] Other interesting features reported for γ-Al 2 O 3 /rGO nanostructures were the enhanced photocatalytic activity under solar light for decomposing certain organics [30] and the good electrochemical performance for ascorbic acid sensing. [31] On the other hand, the incorporation of graphene nanoplatelets (GNP) as fillers, which are better electrical and thermal conductors than either rGO nanoplatelets or nanoribbons, and can be added in higher concentrations, [22] would allow simultaneous improvements of the thermal performance and the mechanical response of highly porous γ-Al 2 O 3 structures.…”

High Performance Hybrid Graphene Nano Filters as a Total dissolved solid remover

“…Graphene in synergism with Alumina Nanoparticles Aluminium (III) oxide (α-Al2O3) is an amphoteric oxide of aluminium widely known as Alumina, AL oxide, or Alundum based on their existence in nature aluminium oxide generally occurs as mineral corundum which is the most common crystalline polymorphic form. Aluminium Oxide has relatively higher thermal conductivity but poor conductor of electricity [27] bending strength and hardness generally relies upon two factors density and surface area of the nanocomposite [28] conducted sets of experiments to observe bending strength of alumina nanoparticle drastically excelled by addition of reduced graphene oxide in small amount further addition of graphene in higher amounts resulted in reduction of bending strength because when the amount of graphene is incremented, pores formation took place due to agglomeration and overlapping of molecules which further reduced density of nanocomposites therefore weakening flexural strength, their maximum flexural strength calculated at (671.8 MPa) observed at 0.4 percent addition amount of reduced graphene oxide in comparisons to pure Al2O3 which approximates around 415.8 MPa, this shows significance rise in strength of the nanocomposite [29] suggest a great demand for photocatalytic materials for environmental purposes due to high energy consumption of conventional technologies, graphene oxide termed out to be the most effective contender as photocatalytic material for TDS degradation which gives synergistic effect with recombination with highly photocatalytic substance Al2O3 [30] graphene oxides sheets function as excellent sheet for combination for metal oxides [31] conducted an experiments to document a novel approach to create Graphene-Aluminium oxide nanocomposites which showcased a successful degradation of organic dyes phydroxy benzoic acid(BA), methylene blue(MB), Methyl Orange(MO) because the Graphene-Al2O3 nanocomposites were successfully modulated to enhance light absorption capability of multiple solar spectrum here graphene-Al2O3 nanocomposites were also compared to pure Graphene oxide and γ-Al2O3 overall graphene oxides electronic properties were effective between transportation of electrons in graphene oxide framework, through novel dry sol-gel method, fabrication of Al2O3 microstructures on Graphene sheets increased vital photocatalytic properties which was selectively absent in pure Al2O3 particles. [32]Kanwal et al, 2020 carried a photocurrent test by using linear sweep voltammetry to evaluate rate of recombination and charge transfer efficiencies to illustrate electron-hole pair separation, the transfer of electron from Graphene sheets to Al2O3 by interfacial potential gradient of the nanocomposite conduction bands reduced charge recombination rate of electron-hole pair the photocatalytic action of the graphene aluminium oxide caused by transference of electron in the binary heterojunction, synergistic hybrid nanoparticles have extended surface area with additional active sites augmenting photocatalytic activity.…”

MIL-100(Fe) Metal–Organic Framework Nanospheres Embedded in Graphene Matrixes for Xanthine Fluorescence Sensing

“…However, the inherent low electrical conductivity and heavy agglomeration make it impossible for them to be excellent sensing materials. As a consequence, various MOF-based nanocomposites using different substrates including polymers, , alumina, oxides, and carbon-based materials − were explored. Among these, MOF/graphene oxide (GO) nanocomposites − are the most promising due to their synergic effects between the controlled porosity and selectivity of MOFs and the excellent conductivity of GO.…”