High specific surface area γ-Al2O3 nanoparticles synthesized by facile and low-cost co-precipitation method

Abstract

Alumina (Al2O3) nanoparticles (NPs) are particularly adsorbent NPs with a high specific surface area (SSA) that may well be utilized to clean water. In this study, pure γ-alumina NPs are successfully synthesized by the co-precipitation method, and the effect of ammonium bicarbonate concentration on the synthesized NPs is studied to find the optimum concentration to provide the highest capacity of copper ions removal from water. The results declare that spherical alumina NPs with average diameters in the range of 19–23 nm are formed with different concentrations of precipitation agent, and the concentration has no significant effect on the morphology of NPs. Furthermore, the precipitating agent concentration influences the optical characteristics of the produced alumina NPs, and the bandgap energies of the samples vary between 4.24 and 5.05 eV. The most important impact of precipitating agent concentrations reflects in their SSA and capacity for copper ion removal Ultra-high SSA = 317 m2/g, and the highest copper removal at the adsorbate concentration of 184 mg/L is achieved in an alkalis solution followed by a neutral solution. However, admirable copper removal of 98.2% is even achieved in acidic solutions with 0.9 g/L of the alumina NPs synthesized at a given concentration of ammonium bicarbonate, so this sample can be a good candidate for Cu ions removal from acidic wastewater.

Coupling of Steam and CaO Derived from Oyster Shells in the Pyrolysis of Waste Poly(ethylene terephthalate) for the Selective Production of Aromatic Hydrocarbons

“…SrO and MgO could enhance the surface basicity of catalysts by providing additional basic sites, which facilitated the deprotonation of carboxylic acid groups to generate carboxylate anions and subsequently aromatic hydrocarbons. , ZnO and Fe 2 O 3 could adjust the electron density and energy level distribution on the catalyst surface by providing extra electrons or modifying the electron distribution. These modifications facilitated the adsorption of aromatic acids, reduced their activation energy, and expedited the decarboxylation process. , SiO 2 , TiO 2 , and Al 2 O 3 could serve as network-forming agents to stabilize the lattice structures of catalysts at high temperatures, indirectly boosting their catalytic activity. , …”

Electro‐Induced Self‐Reduction TiO2 in Viologen‐Based Ionogels for Multi‐Color Electrochromic Displays

“…The crystal forms and micromorphologies (particle sizes) of the four inorganic particles were characterized by X‐ray diffraction (XRD) and scanning electron microscope (SEM). Figure S2 (Supporting Information) shows that SiO 2 , Al 2 O 3 , ZnO, and TiO 2 crystal phases are α ‐tridymite, [ 30 ] γ phase, [ 31 ] hexagonal wurtzite, [ 32 ] and mixed phases (anatase and rutile), [ 33 ] respectively. In addition, SiO 2 , Al 2 O 3 , ZnO, and TiO 2 are nanoparticles with sizes of 33 ± 3, 32 ± 2, 38 ± 6, and 30 ± 5 nm, respectively, which ensures they exhibit similar size effects in EVG (Figure S3, Supporting Information).…”

Potent and Versatile Biogenically Synthesized Alumina/Nickel Oxide Nanocomposite Adsorbent for Defluoridation of Drinking Water

“…Numerous recent investigations have revealed that the coprecipitation method may produce NPs as small as 100 nm. This method is inexpensive, simple, and capable of manufacturing high-quality NPs. , …”