Facile Synthesis of SnO2 Aerogel/Reduced Graphene Oxide Nanocomposites via in Situ Annealing for the Photocatalytic Degradation of Methyl Orange

Abstract

SnO2 aerogel/reduced graphene oxide (rGO) nanocomposites were synthesized using the sol–gel method. A homogeneous dispersion of graphene oxide (GO) flakes in a tin precursor solution was captured in a three-dimensional network SnO2 aerogel matrix and successively underwent supercritical alcohol drying followed by the in situ thermal reduction of GO, resulting in SnO2 aerogel/rGO nanocomposites. The chemical interaction between aerogel matrix and GO functional groups was confirmed by a peak shift in the Fourier transform infrared spectra and a change in the optical bandgap of the diffuse reflectance spectra. The role of rGO in 3D aerogel structure was studied in terms of photocatalytic activity with detailed mechanism of the enhancement such as electron transfer between the GO and SnO2. In addition, the photocatalytic activity of these nanocomposites in the methyl orange degradation varied depending on the amount of rGO loading in the SnO2 aerogel matrix; an appropriate amount of rGO was required for the highest enhancement in the photocatalytic activity of the SnO2 aerogel. The proposed nanocomposites could be a useful solution against water pollutants.

Green synthesis of vanadium oxide-zirconium oxide nanocomposite for the degradation of methyl orange and picloram

“…The band gap energy calculated on the basis of absorbance edge are 3.93 eV. The band gap energy of V 2 O 5 /ZrO 2 NC is found different from that of the ZrO 2 and V 2 O 5 , suggesting that the formation of new material [17,18]. The Fourier transform infrared spectrum of V 2 O 5 /ZrO 2 NC shown in figure 7 exhibits a broad band assigned to stretching vibration of OH group around 3499 cm −1 .…”

“…On other hand, V 2 O 5 have narrow band gap ∼2.3 eV, which can spread the light absorption to visible region [11][12][13][14][15][16]. The coupling of two or more active components effectively make hetero-structure like SnO 2 aerogel/reduced graphene oxide nanocomposite coupling and Ag 2 CO 3 /Bbbi 2 WO 6 heterojunction are a more powerful method to overcome the drawbacks of all traditional photo catalysts [17][18][19].…”

Anisotropic Nanocellulose Aerogel Loaded with Modified UiO-66 as Efficient Adsorbent for Heavy Metal Ions Removal

“…Aerogel, as a new generation of 3D network material, possesses many applications such as catalysis [ 12 , 13 , 14 ], adsorption, and energy storage equipment due to its various superior properties including a high porosity, low cost, and large specific surface area [ 15 , 16 ]. Unlike traditional adsorbents, cellulose nanofiber (CNF) aerogels combine the advantages of both aerogel-type materials and many other superior properties such as rich sources, renewability, biodegradability, and ease of modification [ 17 , 18 , 19 ].…”

Nanoporous Crystalline Composite Aerogels with Reduced Graphene Oxide

“…Graphene oxide (GO) and other carbon-based oxides have long been highly attractive for use as catalysts, catalyst carriers, and catalytic reagents in organic molecule transformations [ 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ] due to their unique characteristics, which include enriched chemical structures, functional active sites (acidic and basic), wreckages, defects, unpaired π-electrons of carbon, and larger specific surface areas. Moreover, the addition of carbon-based materials has been also shown to improve the efficiency of metal oxide photocatalysts [ 50 , 51 ]. As the catalytic efficiency strongly depends on active sites and available surface area of the catalyst [ 43 , 44 , 45 , 49 ], undesired large polydisperse particles are formed.…”