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Alumina-Based One-Dimensional (1D) Nanomaterials: Synthesis and Environmental Remediation
Published in Uma Shanker, Manviri Rani, Liquid and Crystal Nanomaterials for Water Pollutants Remediation, 2022
Abhipsa Mahapatra, Manamohan Tripathy, Garudadhwaj Hota
Li et al. synthesized different morphology of boehmite (AlOOH) using the hydrothermal process (Li et al. 2019). The morphology of the obtained materials mostly affected by the pH of the precursors’ solution and changes to 1D rods or 2D sheets of different sizes. The obtained materials were applied for the adsorption of Cr (VI) and nitrates from the water system. The details about the adsorption process are discussed later.
Self-Limiting Two-Dimensional Surface Oxides of Liquid Metals
Published in Mohammad Karbalaei Akbari, Serge Zhuiykov, Ultrathin Two-Dimensional Semiconductors for Novel Electronic Applications, 2020
Mohammad Karbalaei Akbari, Serge Zhuiykov
Among existing synthesis methods of 2D nanostructures, a green synthesis method was introduced recently for large-scale production of γ-AlOOH nanosheets [48]. Oxide hydroxide of aluminum (boehmite γ-AlOOH) is one of the main precursors for the synthesis of aluminum oxides. The control of morphology and crystalline state of boehmite is highly important since it determines the properties of Al2O3 films after annealing. γ-AlOOH is a stable compound in environment with filtering applications. The high surface area γ-AlOOH can be synthesized by several techniques, which are mostly based on the techniques that require high-temperature, power-intensive and long-processing times [48]. Furthermore, the production process is accompanied by the usage and release of toxic chemicals. In the proposed green synthesis method, 2D γ-AlOOH nanosheets were synthesized based on the instant reaction between the galinstan surface and H2O (Figure 3.8a). In this method aluminum containing galinstan alloys (3.3 wt. % Al) are exposed to the aqueous environment either in the form of liquid or vapor phases. The instant reaction of galinstan alloy with aqueous environment was accompanied by the production of the hydrogel products. When the galinstan alloy was placed adjacent to the distillated water (DIW), the gas bubbles were formed on the liquid metal surface and caused the delamination of 2D films from the surface. Interestingly, water vapor gas resulted in the formation of 1D nano-pillar structures perpendicular to the surface of a liquid galinstan alloy. The fibers continuously grew upward as clearly demonstrated in Figure 3.8b to finally produce an aerogel [48]. After the consumption of aluminum, the reaction stopped. Then, after removal of hydrogel and aerogel from the reaction environment, the remaining galinstan droplet was recycled for the other synthesis process (Figure 3.8c).
Preparation and characterization of modified anion exchange resin for uranium adsorption: estimation of nonlinear optimum isotherm, kinetic model parameters, error function analysis and thermodynamic studies
Published in Journal of Dispersion Science and Technology, 2023
Amany R. Salem, Heba H. El-Maghrabi
The size and morphology of the samples were examined using SEM, and the results are shown in Figure 1. The image of pure Lewatit monoplus 500 resin (LM500) in Figure 1a was shown the smooth, well ordered, regular and uniform spherical shape in macroporous particles. The image in Figure 1b of HZnO@ LM500 before milling process was revealed good decoration of the resin via direct growth of nanosized Zn LDH particles on the surface of macroporous resin particles. All the SEM images of the prepared materials after the milling process were illustrated the changes in the morphology via the development of cracked nanocomposites with irregular shape for all of the nanoparticle with more surface area and pores that could enhancement the adsorption properties of the prepared nanocomposites. The compositions of the prepared nanocomposites were presented via EDX analysis as shown in Figure 2. The crystal structure of the obtained nanocomposites was investigated by powder XRD diffraction as illustrated in Figure 3. XRD pattern of prepared Al hydroxide nanoparticles is demonstrated in Figure 3a. It shows a pure hexagonal structure of boehmite (γ-AlO(OH)). The obtained diffraction pattern was constituted by broad peaks due to the small particle size, however suitable agreement to JCPDS Card No. 21-1307, 2θ = 14.4, 21, 28.2, 38.3, 49.2, 64 and 71.9. The reference peaks are also depicted in the XRD pattern.
Swelling triggered release of cisplatin from gelatin coated gold nanoparticles
Published in Inorganic and Nano-Metal Chemistry, 2022
Nishi Verma, Alka Tiwari, Jaya Bajpai, Anil Kumar Bajpai
In addition, boehmite is the one type of nanofibre martial first synthesized by John Bugosh in 1961. Various methods like sol–gel, hydrothermal, precipitation, and sprays have been used to synthesize this nanofibre. Boehmite materials having 20–50 nm sizes are creating huge attention because of their outstanding advantages like large surface area, narrow pore size distributions within the mesoporous range, as well as suitable surface acidic–basic properties.[12] Recently, nano silica functionalized sulfonic acid as heterogeneous solid acid catalyst has been used for performing various reactions. Amidoalkyl naphthols can be synthesized by using nano silica sulfuric acid as an efficient heterogeneous catalyst under thermal solvent-free conditions and it is the most promising tool for biological and pharmaceutical activities.[13]Electrospinning,[14] as a peer technology of electrospraying,[15] can fabricate polymeric nanofibers with variable structural features in a single-step process. These new types of polymer-based nanofibers can be loaded with different kinds of active ingredients, including those for treating corona virus disease 2019 (COVID-19). Core-shell nanofibers generated from coaxial and modified triaxial processes can provide many strategies for constructing new functional nanomaterials, including those for providing drug sustained release profiles.[16]
BNPs@Cur-Pd as a versatile and recyclable green nanocatalyst for Suzuki, Heck and Stille coupling reactions
Published in Journal of Experimental Nanoscience, 2020
Muhammed Ali Jani, Kiumars Bahrami
The copious solid supports for Pd are used to provide heterogeneous catalysts that facilitate the separation, reusing and decrease of metal-contamination. For this purpose, numerous solid materials have been utilized as catalyst supports including silica, CNT, polymers, MOF, and zeolites [9–16]. Recently using the boehmite nanoparticles as versatile supports to the production of the new catalyst has received great attention. Boehmite (γ-AlOOH) with oxy-hydroxide bonds has been identified as a metastable phase of aluminum oxide which can be provided in both synthetic and mineral sources [17,18]. In recent years, only a few studies on the synthesis of boehmite based nanocatalysts have been conducted to catalyze organic reactions [19–27].